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Journal articles on the topic 'Ulva'
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1
Farhan, Andi M., Andi Zaky Hanifan, Rifqiyanti Ismi, Al Fikriyani, Chanifah T. Maulita, and Irene E. Rieuwpassa. "Potential extract of green algae (Ulva luctuca) as antimicrobial in mouthwash: literature review." Makassar Dental Journal 11, no. 3 (2022): 270–74. http://dx.doi.org/10.35856/mdj.v11i3.640.
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Green algae as one of the marine natural resources which is included in the main seaweed is found in many coastal areas of In-donesia. The bioactive component that acts as an antibacterial agent in green algae type Ulva lactuca is ulvan polysaccharide extract. Ulvan is a cell wall polysaccharide that accounts for 9-36% dry weight of Ulva biomass and is mainly composed of rhamnose sulfate, uronic acid (glucuronic acid and iduronic acid) and xylose. Polysaccharide ulvan extracted from Ulva lactuca can be one of the antimicrobial materials used in mouthwash in dentistry.
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Cindana Mo’o, Faradila Ratu, Gofarana Wilar, Hari Prasad Devkota, and Nasrul Wathoni. "Ulvan, a Polysaccharide from Macroalga Ulva sp.: A Review of Chemistry, Biological Activities and Potential for Food and Biomedical Applications." Applied Sciences 10, no. 16 (2020): 5488. http://dx.doi.org/10.3390/app10165488.
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The species of green macroalga belonging to the genus Ulva (family: Ulvaceae) are utilized in various fields, from food supplements to biomedical applications. Ulvan, a polysaccharide obtained from various Ulva species, has shown various biological activities, including antioxidant, anti-inflammatory, anticancer, antibacterial, and antiviral activities. To obtain the polysaccharide ulvan that can be utilized in various fields, it is necessary to understand the critical points that affect its physicochemical nature, the extraction procedures, and the mechanism of action for biological activities. This article discusses the physicochemical properties, extraction, isolation and characterization procedures and benefits in food and biomedical applications of ulvan. In conclusion, ulvan from Ulva sp. has the potential to be used as a therapeutic agent and also as an additional ingredient in the development of tissue engineering procedures.
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Pari, Rizfi Fariz, Uju Uju, Safrina Dyah Hardiningtyas, et al. "Ulva Seaweed-Derived Ulvan: A Promising Marine Polysaccharide as a Sustainable Resource for Biomaterial Design." Marine Drugs 23, no. 2 (2025): 56. https://doi.org/10.3390/md23020056.
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Green seaweed is currently underused compared with other major seaweed types. Many scientists have reported applications of the green seaweed Ulva in various fields in recent years, which makes it a candidate for biomass production in industrial biorefineries. Ulva contains a unique polysaccharide called ulvan, which is being considered for medicinal and pharmacological applications. Ulvan is a sulfated polysaccharide including rhamnose and glucuronic acid residues, which has a range of bioactivities, including immunomodulatory, antimicrobial, and anticoagulant properties. The biocompatibility of ulvan makes it a versatile candidate for biomaterial design. This review presents an in-depth analysis of the potential applications of ulvan, starting with extraction methods and structural/biological characterization and moving on to biomaterial design. We also highlight the advantages of ulvan over traditional seaweed polysaccharides such as agar, carrageenan, and alginate.
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Rocha, Jamilly Sousa, Daniele Santos, Mateus Aranha Martins, et al. "Sea lettuce (Ulva ohnoi) cultivation in biofloc technology: growth performance and characterization of bioactive compounds." Boletim do Instituto de Pesca 49 (November 17, 2023): e848-e848. http://dx.doi.org/10.20950/1678-2305/bip.2023.49.e848.
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This work evaluated the biofloc technology cultivation of Ulva ohnoi on its growth performance and biocompounds contents. Ulva ohnoi was cultivated under an initial density of 6 g·L-1 for 28 days using water from a biofloc tank which was exchanged daily at a 90% rate. Temperature, salinity, and illuminance were measured daily. Algae growth and their density was adjusted weekly. Results showed an average plant growth of 1.15%·day-1 (49.5 g·week-1). A significant difference was observed when comparing the initial (2.64 ± 0.3%) and final (4.62 ± 0.2%) ulvan concentration, in addition to a protein increase of 30.2%. No statistical differences were found for concentrations of phenolics and chlorophylls. An increase in flavonoids was observed on days 7 and 14 (0.41 ± 0.04; and 0.41 ± 0.07 μg·g-1 of dry weight), as well as a decrease in carotenoids (41.3%). In conclusion, increases in protein and ulvan were observed after Ulva ohnoi was cultivated in bioflocs
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Torres, Fernando G., and Adrian Urtecho. "Ulvan From <i>Ulva Nematoidea</i> as a Novel Active Surface Material for Triboelectric Nanogenerators." Detritus, no. 30 (March 20, 2025): 63–74. https://doi.org/10.31025/2611-4135/2025.19471.
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Marine algae represent an underutilized biomass resource. Biopolymers can be extracted from different types of algae. Alginates and carrageenans are among the most common biopolymers extracted from brown and red algae. They find applications in the food and biomaterials industries, among others. However, other available marine algae are not commercially exploited. For instance, green algae from the Ulvaceae family remain largely unexploited and have no industrial applications. In particular, Ulva species can serve as a promising source for the extraction of a biopolymer known as ulvan. This work reports the development of triboelectric nanogenerators (TENGs) for energy harvesting applications using ulvan extracted from the green algae Ulva nematoidea. Ulvan was extracted via an alkaline method. The extracted ulvan was dissolved in water, poured into petri dishes, and dried to form thin films. TENGs were prepared using Ulvan-Kapton® and Ulvan-Polytetrafluoroethylene (PTFE) triboelectric pairs. The Ulvan-Kapton® TENG showed a maximum voltage of 2.12 V and a short-circuit current of 1.6 µA while the Ulvan-PTFE TENG showed a maximum voltage of 43.60 V and a short-circuit current of 5.6 µA. This performance is similar to the performance of other TENGs fabricated from commercial biopolymers. This suggest that ulvan extracted from Ulva nematoidea have potential applications as active surface of TENGs for the development of sustainable energy harvesting devices. This work shows that bio-based materials from green algae can serve as a potential alternative for renewable energy generation. Further research will allow to enhance mechanical properties, electrical performance, and durability of ulvan-based TENGs to improve their practical applicability.
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Reis, Renata Perpetuo, Antônio Carlos Silva de Andrade, Ana Carolina Calheiros, Jéssica Carneiro Oliveira, and Beatriz Castelar. "Effects of extracts of two Ulva spp. seaweeds on tomato germination and seedling growth." Research, Society and Development 9, no. 11 (2020): e61691110174. http://dx.doi.org/10.33448/rsd-v9i11.10174.
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Brown seaweed extracts are commercially used as agricultural biostimulants, and the green macroalgae Ulva spp. has shown promise for that purpose. We evaluated the ideal dosage of U. lactuca ulvan and flour on seed germination invigoration and the effects of U. flexuosa and U. lactuca extracts on tomato seedling growth (Solanun lycopersicum). The germination recovery of aged seeds after the application of U. lactuca was evaluated by seed germination rates and seedling emergence. Greenhouse cultivated seedlings were irrigated with 0.2 and 0.4 g×L-1 of the flour, or an ulvan solution of Ulva spp. Seedling growth parameters (height, stem diameter, height/stem diameter ratio, biomass, and number of leaves) were compared with the control (seedlings irrigated with distilled water). All dosages of U. lactuca ulvan and flour were found to increase the germination rates of aged seeds as compared to controls. No significant difference in seedling emergence rates were seen. After treatment with Ulva spp. extracts no significant differences in seedling growth were detected. We concluded that low doses of the U. lactuca extract will increase the germination rates of S. lycopersicum seeds and, while different dosages of the extracts of two Ulva’s species did not stimulate tomato seedling growth, they were also not lethal.
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Tran, Vy Ha Nguyen, Thuan Thi Nguyen, Hang Thi Thuy Cao, et al. "Sulfated polysaccharides of Green Algae: Chemical Composition and Antioxidant Activity <i>in vitro</i> of Fractionated Ulvans from <i>Ulva lactuca</i> and <i>Ulva papenfussii</i>." Vietnam Journal of Marine Science and Technology 25, no. 2 (2025): 207–20. https://doi.org/10.15625/1859-3097/22735.
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The study evaluated the chemical composition, molecular weight, and antioxidant activity of ulvan extracted from Ulva papenfussii and Ulva lactuca. The results revealed distinct differences in the monosaccharide composition, sulfate content, and uronic acid levels between ulvans from both species, with ulvan from U. papenfussii exhibiting higher levels of iduronic acid and sulfate (16.39 ± 0.45 %w/w and 28.46 + 3.63 %w/w). Ulvan was fractionated using anion exchange chromatography (DEAE) based on charge differences, yielding three main fractions from each species. This study is the first to analyze different ulvan fractions from Vietnamese green algae using the anion exchange chromatography method. The antioxidant activity of the ulvan fractions was determined by their ability to DPPH radical scavenging activity, reducing power activity, and antioxidant activity, with UL2 (29.5 ± 0.94 Sc%) and UP2 (25.9 ± 1.77 Sc%) demonstrating the most prominent results. These active fractions were characterized by higher sulfate and uronic acid content, suggesting a potential structure–activity relationship. These findings highlight the potential of ulvan in the food and pharmaceutical industries.
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Shefer, Shai, Arthur Robin, Alexander Chemodanov, et al. "Fighting SARS-CoV-2 with green seaweed Ulva sp. extract: extraction protocol predetermines crude ulvan extract anti-SARS-CoV-2 inhibition properties in in vitro Vero-E6 cells assay." PeerJ 9 (November 15, 2021): e12398. http://dx.doi.org/10.7717/peerj.12398.
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Due to the global COVID-19 pandemic, there is a need to screen for novel compounds with antiviral activity against SARS-COV-2. Here we compared chemical composition and the in vitro anti- SARS-COV-2 activity of two different Ulva sp. crude ulvan extracts: one obtained by an HCl-based and another one by ammonium oxalate-based (AOx) extraction protocols. The composition of the crude extracts was analyzed and their antiviral activity was assessed in a cytopathic effect reduction assay using Vero E6 cells. We show that the extraction protocols have a significant impact on the chemical composition, anti- SARS-COV-2 activity, and cytotoxicity of these ulvan extracts. The ulvan extract based on the AOx protocol had a higher average molecular weight, higher charge, and 11.3-fold higher antiviral activity than HCl-based extract. Our results strongly suggest that further bioassay-guided investigation into bioactivity of compounds found in Ulva sp. ulvan extracts could lead to the discovery of novel anti-SARS-CoV-2 antivirals.
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Sivaprakash, G., K. Mohanrasu, V. Ananthi, et al. "Biodiesel production from Ulva linza, Ulva tubulosa, Ulva fasciata, Ulva rigida, Ulva reticulate by using Mn2ZnO4 heterogenous nanocatalysts." Fuel 255 (November 2019): 115744. http://dx.doi.org/10.1016/j.fuel.2019.115744.
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Minh Thu, Quach Thi. "EFFECT OF SULFATION ON THE STRUCTURE AND ANTICOAGULANT ACTIVITY OF ULVAN EXTRACTED FROM GREEN SEAWEED ULVA RETICULATA." Vietnam Journal of Science and Technology 54, no. 2C (2018): 373. http://dx.doi.org/10.15625/2525-2518/54/2c/11863.
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Ulvans are sulfated polysaccharides derived from the cell wall of green seaweeds. Thechemical structure of ulvan extracted from Ulva reticulata is reported, focusing on investigationof the sulfated modification of the ulvan and the changes in structure and anticoagulant activity.The results showed that sulfated modification was able to change the ulvan conformationalstructure and markedly enhance its anticoagulant activity.
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Adrien, Amandine, Antoine Bonnet, Delphine Dufour, Stanislas Baudouin, Thierry Maugard, and Nicolas Bridiau. "Anticoagulant Activity of Sulfated Ulvan Isolated from the Green Macroalga Ulva rigida." Marine Drugs 17, no. 5 (2019): 291. http://dx.doi.org/10.3390/md17050291.
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(1) Background: Brown and red algal sulfated polysaccharides have been widely described as anticoagulant agents. However, data on green algae, especially on the Ulva genus, are limited. This study aimed at isolating ulvan from the green macroalga Ulva rigida using an acid- and solvent-free procedure, and investigating the effect of sulfate content on the anticoagulant activity of this polysaccharide. (2) Methods: The obtained ulvan fraction was chemically sulfated, leading to a doubling of the polysaccharide sulfate content in a second ulvan fraction. The potential anticoagulant activity of both ulvan fractions was then assessed using different assays, targeting the intrinsic and/or common (activated partial thromboplastin time), extrinsic (prothrombin time), and common (thrombin time) pathways, and the specific antithrombin-dependent pathway (anti-Xa and anti-IIa), of the coagulation cascade. Furthermore, their anticoagulant properties were compared to those of commercial anticoagulants: heparin and Lovenox®. (3) Results: The anticoagulant activity of the chemically-sulfated ulvan fraction was stronger than that of Lovenox® against both the intrinsic and extrinsic coagulation pathways. (4) Conclusion: The chemically-sulfated ulvan fraction could be a very interesting alternative to heparins, with different targets and a high anticoagulant activity.
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Panjaitan, Pola S. T., Catur Pramono Adi, Aripudin Aripudin, Suratna Suratna, and Ida Romawati. "PEMBUATAN RENGGINANG SINGKONG DENGAN PENAMBAHAN TEPUNG RUMPUT LAUT (Ulva Lactuca)." Grouper 14, no. 1 (2023): 15–23. http://dx.doi.org/10.30736/grouper.v14i1.125.
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Dalam pembuatan rengginang tidak ada penambahan zat gizi sehingga kandungan nutrisi di rengginang itu rendah, salah satunya kandungan protein. Maka dari itu dengan adanya potensi rumput laut ulva lactuca dapat dimanfaatkan sebagai upaya meningkatkan kandungan gizi protein rengginang singkong. Tujuan pada penelitian ini yaitu:Mengetahui cara pembuatan rengginang singkong dengan penambahan tepungrumput laut ulva lactuca; Mengetahui pengaruh penambahan tepung rumput laut ulva lactuca terhadap mutu hedonik rengginang singkong; dan Mengetahui pengaruh kandungan proksimat pada rengginang singkong dengan penambahan tepung rumput laut ulva lactuca.F1 dengan penambahan tepung rumput laut 10%, F2 dengan penambahan tepung rumput laut 12,5%, dan F3 dengan penambahan tepung rumput laut 15% pada parameter kenampakan, aroma, rasa dan tekstur. Pada mutu kimia perlakuan F1 dengan perlakuan F0 yang tidak ada penamabahan tepung rumput laut ulva lactuca menunujukkan adanya penurunan kadar air sebesar 4,55% berarti pada perlakuan F1 telah memenuhi Standar mutu BSN 1999 yaitu dengan kadar air maksimal 11 g dan 1,47% kenaikan kadar protein pada perlakuan F1. Dengan kadar air 10,14% dan kadar protein 1,47% pada perlakuan F1 yang berarti perlakuan F1 telah memenuhi standar BSN 1999 yaitu dengan kadar protein maksimal 6 g.
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Jacoeb, Agoes Mardiono, Asadatun Abdullah, and Siti Nur Hakimah. "Potensi ulvan dari Ulva lactuca sebagai sumber antioksidan." Jurnal Pengolahan Hasil Perikanan Indonesia 27, no. 3 (2024): 242–51. http://dx.doi.org/10.17844/jphpi.v27i3.46950.
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Dinding sel Ulva lactuca menghasilkan ulvan yang merupakan hidrokoloid bersulfat dan berpotensi sebagai antioksidan. Penelitian ini bertujuan untuk menentukan pengaruh lama pemanasan dalam autoklaf (15 dan 20 menit; 121℃) terhadap rendemen, kadar gula dan sulfat, serta aktivitas antioksidan ulvan. Rendemen ulvan, kandungan gula dan sulfat diukur masing-masing dengan metode gravimetri dan spektrofotometri. Ekstrak kering oven diuji gugus fungsi dan antioksidannya menggunakan FTIR dan metode DPPH. Ulvan hanya bisa dihasilkan melalui ekstraksi pada suhu 121℃ waktu 15 menit. Ekstrak kering ulvan memberikan rendemen 1,98%, kandungan gula total 46,06±0,16% dan kadar sulfat 21,53±1,16%. Spektrum FTIR menunjukkan adanya bilangan gelombang 850 dan 790 cm-1 yang merupakan ciri ulvan. Uji DPPH menghasilkan IC50 sebesar 469 ppm, yang tergolong sebagai antioksidan lemah.
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Chávez-Sánchez, Tonatiuh, Alejandra Piñón-Gimate, James T. Melton III, Juan Manuel López-Bautista, and Margarita Casas-Valdez. "First report, along with nomenclature adjustments, of Ulva ohnoi, U. tepida and U. torta (Ulvaceae, Ulvales, Chlorophyta) from northwestern Mexico." Botanica Marina 62, no. 2 (2019): 113–23. http://dx.doi.org/10.1515/bot-2018-0007.
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Abstract Examining morphological and anatomical characters, eight bloom-forming Ulva species were identified from La Paz Bay, Gulf of California, Mexico. However, DNA sequencing, using a multi-gene approach (rbcL, ITS2 and tufA) revealed that, of the eight species, four species were genetically distinct, none of which belonged to the species they would have been ascribed based on morpho-anatomical observations. The Ulva lactuca and Ulva rigida morphotypes (blades two cells thick, unbranched, attached by a small discoid holdfast) corresponded to Ulva ohnoi; the Ulva intestinalis morphotype (tubular and smooth thallus, one cell thick) corresponded to Ulva tepida; the Ulva clathrata and Ulva flexuosa morphotypes (tubular to slightly compressed thallus) corresponded to Ulva torta. The Ulva acanthophora morphotype (more or less tubular, profusely branched) did not correspond molecularly to any currently described species. Attempts to sequence the remaining two species, morpho-anatomically identified as Ulva lobata and Ulva nematoidea, were unsuccessful. This study similarly highlights the high degree of cryptic diversity in the genus Ulva, provides a nomenclature adjustment for several species of the genus Ulva from northwestern Mexico and is the first to report U. ohnoi, U. tepida and U. torta for the region.
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Fort, Antoine, Morgane Lebrault, Margot Allaire, et al. "Extensive Variations in Diurnal Growth Patterns and Metabolism Among Ulva spp. Strains." Plant Physiol . 180, no. 1 (2019): 109.123. https://doi.org/10.1104/pp.18.01513.
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Green macroalgae of the genus <em>Ulva</em> play a key role in coastal ecosystems and are of increasing commercial importance. However, physiological differences between strains and species have yet to be described in detail. Furthermore, the strains of <em>Ulva</em> used in aquaculture usually originate from opportunistic collection in the wild without prior selection of best performing strains. Hence, efforts are required to detect the potential variability in growth and metabolic accumulation between <em>Ulva</em> strains and ultimately select the best performing strains under given environmental conditions. Here, the growth, physiological, and metabolic characteristics of 49 laminar <em>Ulva</em> spp. strains were investigated using a custom-made high-throughput phenotyping platform, enzymatic assays, and gas chromatography-mass spectrometry. We found large natural variation for a wide range of growth and metabolic characteristics, with growth rates varying from 0.09 to 0.37 mg.mg<sup>-1</sup>d<sup>-1</sup> among strains. <em>Ulva</em> spp. possess a unique diurnal growth pattern and primary metabolism compared with land plants, with higher growth rates during the night than during the light period. Starch and sucrose only contributed on average 35% of the carbon required to sustain <em>Ulva</em>'s night growth. Nitrates accumulated during the night in <em>Ulva</em> tissues, and nitrate accumulation and consumption was positively correlated with growth. In addition, we identified six amino acids as possible biomarkers for high growth in <em>Ulva</em> The large variability in growth and metabolite accumulation recorded among morphologically similar <em>Ulva</em> strains justifies future efforts in strain selection for increasing biomass, metabolite yields, and nutrient removal in the growing aquaculture industry.
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Phillips, JA. "Field, anatomical and development studies on southern Australian species of Ulva (Ulvaceae, Chlorophyta)." Australian Systematic Botany 1, no. 4 (1988): 411. http://dx.doi.org/10.1071/sb9880411.
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Populations of Ulva growing in southern Australia were examined to ascertain the taxonomic value of the range of morphological and anatomical characteristics. Cell shape and chlorplast position, as seen in transverse section of the basal region of the thallus, proved to be non-viable characters which separate the species from each other. In culture, the morphology of mature plant is constant and characteristic for each species and thus confirms the validity of the species as defined by anatomical differences. Five species of Ulva (Ulva fasciata Delile, Ulva lactuca L., Ulva laetevirens Areschoug, Ulva rigida C. Agardh, Ulva stenophylla Setchell et Gardner) occur in southern Australia. Ulva rigida C. Agardh and Ulva rigida sensu Bliding, through morphological similarities, are distinct species and the latter is referred to as U. laetevirens. The two species show marked differences in diagnostic anatomical characters and in the pattern of development in culture. Two taxa, Ulva australis Areschoug and Ulva spathulata Papenfuss, are included within U. rigida. Records of Ulva latissma L. in this geographical region probably refer to the broadly expanded morphological forms of U. rigida and U. laetevirens. The status of Phycoseris ulva Sonder, described from the West Australian specimens, is unresolved.
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Hamouda, Ragaa A., Fauzia A. K. Qarabai, Fathi S. Shahabuddin, Turki M. Al-Shaikh, and Rabab R. Makharita. "Antibacterial Activity of Ulva/Nanocellulose and Ulva/Ag/Cellulose Nanocomposites and Both Blended with Fluoride against Bacteria Causing Dental Decay." Polymers 15, no. 4 (2023): 1047. http://dx.doi.org/10.3390/polym15041047.
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One of the most prevalent chronic infectious disorders is tooth decay. Acids produced when plaque bacteria break down sugar in the mouth cause tooth decay. Streptococcus mutans and Lactobacillus acidophilus are the most prominent species related to dental caries. Innovative biocidal agents that integrate with a biomaterial to prevent bacterial colonization have shown remarkable promise as a result of the rapid advancement of nanoscience and nanotechnology. In this study, Ulva lactuca was used as a cellulose source and reducing agent to synthesize nanocellulose and Ulva/Ag/cellulose/nanocomposites. The characterizations of nanocellulose and Ulva/Ag/cellulose/nanocomposites were tested for FT-IR, TEM, SEM, EDS, XRD, and zeta potential. Ulva/Ag/cellulose/nanocomposites and Ulva/nanocellulose, both blended with fluoride, were tested as an antibacterial against S. mutans ATCC 25175 and L. acidophilus CH-2. The results of the SEM proved that nanocellulose is filament-shaped, and FT-IR proved that the functional groups of Ulva/nanocellulose and Ulva/Ag/cellulose/nanocomposites and cellulose are relatively similar but present some small diffusion in peaks. The TEM image demonstrated that the more piratical size distribution of Ulva/Ag/cellulose/nanocomposites ranged from 15 to 20 nm, and Ulva/nanocellulose ranged from 10 to 15 nm. Ulva/Ag/cellulose/nanocomposites have higher negativity than Ulva/nanocellulose. Ulva/Ag/cellulose/nanocomposites and Ulva/nanocellulose possess antibacterial activity against S. mutans ATCC 25175 and L. acidophilus CH-2, but Ulva/Ag/cellulose/nanocomposites are more effective, followed by that blended with fluoride. It is possible to use Ulva/Ag/cellulose/nanocomposites as an antimicrobial agent when added to toothpaste. It is promising to discover an economic and safe nanocomposite product from a natural source with an antimicrobial agent that might be used against tooth bacteria.
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Sinurat, Ellya, Dina Fransiska, Sihono Sihono, and Rinta Kusumawati. "Efek Pemberian Biskuit Ulva terhadap Penurunan Kadar Glukosa Darah Tikus yang Diinduksi Sukrosa." Jurnal Pascapanen dan Bioteknologi Kelautan dan Perikanan 16, no. 1 (2021): 63. http://dx.doi.org/10.15578/jpbkp.v16i1.682.
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Rumput laut Ulva sp. memiliki kandungan serat pangan tinggi yang diketahui memiliki aktivitas hipoglikemik. Penelitian ini telah melakukan penambahan Ulva sp. pada biskuit sebagai makanan sehat yang kaya serat pangan. Tujuan penelitian untuk mengetahui pengaruh pemberian biskuit Ulva terhadap penurunan kadar glukosa darah pada tikus jantan yang diinduksi sukrosa jenuh. Selain itu, diamati profil hematologi dan biokimia klinis darah sebelum dan setelah pemberian biskuit Ulva. Uji antidiabetes dilakukan menggunakan uji toleransi glukosa oral terhadap tikus jantan yang diinduksi sukrosa jenuh. Biskuit Ulva yang diberikan 1 g/kg berat badan (BB) tikus dengan perlakuan kontrol negatif (pakan tanpa biskuit), biskuit tanpa Ulva sp., dan biskuit Ulva setara dengan Ulva sp. 1, 5, dan 10 mg/kg BB. Perlakuan dosis diberikan pada 5 ekor tikus percobaan sekali sehari selama 14 hari. Pengamatan terhadap intoleransi glukosa dilakukan melalui pengukuran glukosa darah setelah pemberian sukrosa jenuh ke semua perlakuan pada hari ke-14, dan diukur pada menit ke-0, 30, 60, dan 120. Penimbangan tikus dilakukan pada hari ke-0, 7, dan 14, sedangkan analisis hematologi dan biokimia klinis darah dilakukan pada hari ke-0 dan ke-14. Pemberian biskuit Ulva berpengaruh signifikan terhadap kadar glukosa darah, serta menurunkan hematokrit dan hemoglobin darah tikus. Biskuit dengan dosis Ulva setara 1 mg/kg BB mampu menurunkan kadar glukosa darah tikus secara efektif pada menit ke-60. Tidak ada perbedaan kenaikan berat badan tikus jantan antara kelompok kontrol negatif dan biskuit Ulva pada hari ke-0, 7, dan 14. Pemberian biskuit Ulva sampai dengan 10 mg/kg BB tidak mempengaruhi SGOT, SGPT, ureum, dan kreatinin tikus. ABSTRACTSeaweed Ulva sp. contains high dietary fiber which is known to have hypoglycemic activity. In this study, the addition of Ulva sp. in biscuit products as a healthy food rich in dietary fiber. The objective of this study was to determine the effect of Ulva added biscuits on blood glucose levels reduction in male rats induced by saturated sucrose. In addition, clinical hematology and blood biochemical profiles before and after the administration of Ulva biscuits were also observed. Antidiabetic method used the oral glucose intolerance test method on male rats induced by saturated sucrose. Ulva biscuits were given at 1 g/kg body weight of rats for each treatment. This test used five treatments, namely negative control (rats feeding without biscuits), rat feeding without Ulva added biscuits; and rat feeding with Ulva biscuits equivalent to 1, 5, and 10 mg Ulva sp. /kg BW. Each dose treatment was given to five experimental rats once a day for 14 days. Observations on glucose intolerance included measurement of blood glucose levels by giving saturated sucrose to all treatments and measured at 0, 30, 60, and 120 minutes after administration of saturated sucrose. The weighing was carried out on day 0, 7, and 14, while clinical hematological and blood biochemical analyzes were performed on day 0 and 14. The administration of Ulva biscuits had a significant effect on the blood glucose levels of male rats, lowering hematocrit and hemoglobin in rat blood. The concentration of 0.1% Ulva biscuits in biscuits (equivalent to a dose of Ulva sp. 1 mg/kg BW) was able to effectively reduce the blood glucose levels of rats after 60 minutes. There was no difference in weight gain of male rats between the negative control group and Ulva biscuits on days 0, 7, and 14. The diet of Ulva biscuits with 10 mg/kg BW Ulva sp. did not affect the SGOT, SGPT, urea, and creatinine of rats.
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Xia, Jing, Peimin He, Jinlin Liu, et al. "Comparing Complete Mitochondrion Genome of Bloom-forming Macroalgae from the Southern Yellow Sea, China." E3S Web of Conferences 233 (2021): 02037. http://dx.doi.org/10.1051/e3sconf/202123302037.
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The green tide in the Southern Yellow Sea which has been erupting continuously for 14 years. Dominant species of the free-floating Ulva in the early stage of macroalgae bloom were Ulva compressa, Ulva flexuosa, Ulva prolifera, and Ulva linza along the coast of Jiangsu Province. In the present study, we carried out comparative studies on complete mitochondrion genomes of four kinds of bloom-forming green algae, and provided standard morphological characteristic pictures of these Ulva species. The maximum likelihood phylogenetic analysis showed that U. linza is the closest sister species of U. prolifera. This study will be helpful in studying the genetic diversity and identification of Ulva species.
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Adlikahfi, Adlikahfi, Ria Azizah Tri Nuraini, and AB Susanto. "Pengaruh Makroalga Ulva lactuca Sebagai Bahan Tambahan Pakan Terhadap Pertumbuhan Ikan Nila." Journal of Marine Research 14, no. 2 (2025): 210–16. https://doi.org/10.14710/jmr.v14i2.42352.
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Ulva lactuca merupakan makroalga dengan kandungan nutrisi yang tinggi sehingga berpotensi sebagai bahan tambahan pakan ikan nila. Ikan nila merupakan komoditas dengan nilai ekonomi yang tinggi. Tujuan penelitian ini adalah untuk mengetahui Ulva lactuca sebagai tambahan pakan ikan dan pengaruh pada pertumbuhan ikan nila, meliputi panjang dan berat ikan nila. Hewan uji yang digunakan adalah ikan nila dengan berat 1-3 gr dan panjang 4-6 gr. Penelitian ini menggunakan metode Rancangan Acak Lengkap (RAL) yang terdiri atas 3 perlakuan, yaitu 6% Ulva lactuca (perlakuan B), 12% Ulva lactuca (perlakuan C), 18% Ulva lactuca (perlakuan D), serta satu kontrol (perlakuan A) dengan 3 kali pengulangan. Ikan nila dipelihara dan diberi pakan selama 21 hari. Hasil penelitian menunjukan bahwa Ulva lactuca dapat digunakan sebagai bahan tambahan pakan ikan nila dengan hasil pertumbuhan perlakuan A (Kontrol) dengan panjang ikan nila 0,91 cm dan berat ikan nila 0,81 gr; perlakuan B (Ulva lactuca 6%) dengan panjang ikan nila 0,84 cm dan berat ikan nila 0,75 gr; perlakuan C (Ulva lactuca 12%) dengan panjang ikan nila 1,01 cm dan berat ikan nila 0,96 gr; perlakuan D (Ulva lactuca 18%) dengan panjang ikan nila 0,87 cm dan berat ikan nila 0,78 gr. Hasil tersebut menjelaskan bahwa penggunaan Ulva lactuca pada pakan ikan nila dapat memberikan pengaruh terhadap pertumbuhan ikan nila. Ulva lactuca dengan perlakuan C (12%) memberikan pertumbuhan berat dan panjang yang lebih tinggi dibandingkan dengan perlakuan kontrol. Ulva lactuca is a macroalgae with high nutritional content so it has potential as an additional ingredient in tilapia fish feed. Tilapia is a commodity with high economic value. The aim of this research was to determine Ulva lactuca as an additional fish feed and its effect on the growth of tilapia, including the length and weight of the tilapia. The test animal used was tilapia with a weight of 1-3 grams and a length of 4-6 grams. This research used a Completely Randomized Design (CRD) method consisting of 3 treatments, namely 6% Ulva lactuca (treatment B), 12% Ulva lactuca (treatment C), 18% Ulva lactuca (treatment D), and one control (treatment A) with 3 repetitions. Tilapia fish are kept and fed for 21 days. The results of the research show that Ulva lactuca can be used as an additional ingredient in tilapia feed with the growth results of treatment A (Control) with a tilapia fish length of 0.91 cm and a tilapia fish weight of 0.81 gr; treatment B (Ulva lactuca 6%) with tilapia fish length of 0.84 cm and tilapia fish weight of 0.75 gr; treatment C (Ulva lactuca 12%) with tilapia fish length of 1.01 cm and tilapia fish weight of 0.96 gr; treatment D (Ulva lactuca 18%) with tilapia fish length of 0.87 cm and tilapia fish weight of 0.78 gr. These results explain that the use of Ulva lactuca in tilapia fish feed can have an influence on the growth of tilapia fish. Ulva lactuca with C treatment (12%) gave higher weight and length growth compared to the control treatment.
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Simon, Clara, Marcus McHale, and Ronan Sulpice. "Applications of Ulva Biomass and Strategies to Improve Its Yield and Composition: A Perspective for Ulva Aquaculture." Biology 11, no. 11 (2022): 1593. http://dx.doi.org/10.3390/biology11111593.
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Sea lettuce (Ulva spp.), with its worldwide distribution and remarkable ability to grow rapidly under various conditions, represents an important natural resource that is still under-exploited. Its biomass can be used for a wide range of applications in the food/feed, pharmaceutical, nutraceutical, biofuel, and bioremediation industries. However, knowledge of the factors affecting Ulva biomass yield and composition is far from complete. Indeed, the respective contributions of the microbiome, natural genetic variation in Ulva species, environmental conditions and importantly, the interactions between these three factors on the Ulva biomass, have been only partially elucidated. Further investigation is important for the implementation of large-scale Ulva aquaculture, which requires stable and controlled biomass composition and yields. In this review, we document Ulva biomass composition, describe the uses of Ulva biomass and we propose different strategies for developing a sustainable and profitable Ulva aquaculture industry.
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El-Gendy, Nour Sh, Hussein N. Nassar, Abdallah R. Ismail, et al. "A Fully Integrated Biorefinery Process for the Valorization of Ulva fasciata into Different Green and Sustainable Value-Added Products." Sustainability 15, no. 9 (2023): 7319. http://dx.doi.org/10.3390/su15097319.
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In the framework of a sustainable marine bioeconomy, the present work describes an advanced, eco-friendly, fully integrated biorefinery process for marine Ulva fasciata macroalgae. That would serve as a solution for ecosystem bioremediation, an effective utilization of marine macroalgal resources, and a new initiative to promote a green and low-carbon economy. Ulva fasciata biomass can be utilized as an organic fertilizer with total N, P2O5, and K2O contents of 3.17% and a C/N ratio of 11.71. It can also be used as a solid biofuel with a sufficient calorific value of 15.19 MJ/kg. It has high carbohydrate content and low lignin content of approximately 44.85% and 1.5%, respectively, which recommend its applicability in bioethanol and biobutanol production. Its protein, fiber, lipid, and ash contents of approximately 13.13%, 9.9%, 3.27%, and 21%, respectively with relatively high concentrations of omega-3 fatty acids (n-3 PUFAs) and omega-9 fatty acids (n-9 MUFAs) and relatively low omega-6 fatty acids (n-6 PUFAs) and a n-6/n-3 ratio of 0.13 also recommend its applicability as food additives and animal feeders. Moreover, the suggested sequential zero-waste biomass residue process yielded 34.89% mineral-rich water extract (MRWE), 2.61% chlorophylla,b, 0.41% carotenoids, 12.55% starch, 3.27% lipids, 22.24% ulvan, 13.37% proteins, and 10.66% cellulose of Ulva fasciata dry weight. The efficient biocidal activity of extracted ulvan against pathogenic microorganisms and sulfate-reducing bacteria recommends its application for medical purposes, water densification, and mitigation of microbially induced corrosion in the oil and gas industry.
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Olsson, Joakim, Gunilla B. Toth, Annelous Oerbekke, et al. "Cultivation conditions affect the monosaccharide composition in Ulva fenestrata." Journal of Applied Phycology 32, no. 5 (2020): 3255–63. http://dx.doi.org/10.1007/s10811-020-02138-9.
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Abstract In recent years, the interest in using seaweed for the sustainable production of commodities has been increasing as seaweeds contain many potentially worthwhile compounds. Thus, the extraction and refining processes of interesting compounds from seaweeds is a hot research topic but has been found to have problems with profitability for novel applications. To increase the economic potential of refining seaweed biomass, the content of the compounds of interest should be maximized, which can potentially be achieved through optimization of cultivation conditions. In this study, we studied how the monosaccharide composition of the green seaweed species Ulva fenestrata is influenced by the abiotic factors; irradiance, temperature, nitrate, phosphate, and pCO2. It was evident that lower nitrate concentration and cultivation at elevated temperature increased monosaccharide contents. A 70% increase in iduronic acid and a 26% increase in rhamnose content were seen under elevated irradiance and temperature conditions, though the absolute differences in monosaccharide concentration were small. Irradiance and nitrate impacted the ratio between iduronic and rhamnose, which is an indicator of the ulvan structure. These results could potentially be utilized to coax the ulvan towards specific bioactivities, and thus have a considerable impact on a potential biorefinery centered around Ulva.
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Turan, Gamze, Andrezza Carvalho Chagas, César S. B. Costa, Wilson F. B. Wasielesky Jr., and Luís H. da Silva Poersch. "Impact of the co-cultivation of macroalgae (Ulva lactuca f. fasciata) on the composition of biofloc in a zero water exchange system used for rearing Pacific white shrimp (Litopenaeus vannamei) (Decapoda, Dendrobranchiata)." Crustaceana 97, no. 1-2 (2024): 125–36. http://dx.doi.org/10.1163/15685403-bja10363.
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Abstract In a closed, or zero water exchange, greenhouse aquaculture system, this study examined the interaction between the aggregation flocs in the mono- and co-cultivation of Pasific white shrimp, Litopenaeus vannamei (300 individuals/m3) with macroalgae, Ulva lactuca f. fasciata at different densities of Ulva (1, 2 and 3 g/l). The investigation was conducted under zero water exchange conditions. The accumulated flocs were compared between the various treatment groups: without Ulva (Treatment Control Group), Ulva at 1 g/l density (T1: Treatment 1), Ulva at 2 g/l (T2: Treatment 2), and Ulva at 3 g/l (T3: Treatment 3). Ultimately, it was determined that Ulva cultivation using the Biofloc system actually helped to ensure the water quality in the zero water exchange culture system during the 35-day experimental period with reduced cyanophyte densities, that can cause toxic algal blooms in aquaculture systems. This was interpreted to result from the fact that Ulva is a naturally occurring bioremediation agent.
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Glasson, Christopher R. K., Cara A. Luiten, Susan M. Carnachan, et al. "Structural characterization of ulvans extracted from blade (Ulva ohnoi) and filamentous (Ulva tepida and Ulva prolifera) species of cultivated Ulva." International Journal of Biological Macromolecules 194 (January 2022): 571–79. http://dx.doi.org/10.1016/j.ijbiomac.2021.11.100.
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Shomron, Alon, Danielle Duanis-Assaf, Ortal Galsurker, Alexander Golberg, and Noam Alkan. "Extract from the Macroalgae Ulva rigida Induces Table Grapes Resistance to Botrytis cinerea." Foods 11, no. 5 (2022): 723. http://dx.doi.org/10.3390/foods11050723.
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Fungal pathogens are a central cause of the high wastage rates of harvested fruit and vegetables. Seaweeds from the genus Ulva are fast-growing edible green macroalgae whose species can be found on the shore of every continent, and therefore present a resource that can be utilized on a global scale. In this study, we found that the application of ulvan extract, a sulfated polysaccharide extracted from Ulva rigida (1000 mg/L), elicited table grapes defense and reduced the incidence and decay area of Botrytis cinerea by 43% and 41%, respectively. In addition, compared to the control group at two days post-treatment, ulvan extract elicited a variety of defense-related biomarkers such as a 43% increase in the activity of reactive oxygen species, 4-fold increase in the activity of catalase, 2-fold increase in the activity of superoxide dismutase and 1.4-fold increase in the activity of chitinase. No increase was observed in phenylalanine ammonia-lyase activity, and the treatment did not affect fruit quality parameters such as the pH levels, sugar levels, and titratable acidity of grapes. These results illustrate the potential of ulvan extract to naturally induce the plant defense response and to reduce postharvest decay.
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Putri, Ryana Tammi. "Pemanfaatan Gagang Hijau (Ulva Latuca L.) untuk Kehidupan Manusia." Jurnal Agricultural Biosystem Engineering 4, no. 1 (2025): 32. https://doi.org/10.23960/jabe.v4i1.10732.
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Indonesia is an archipelago with a long coastline. This condition has the potential to produce green stems (Ulva latuca). Ulva Latuca is a plant containing 25-26% ash. This illustrates that the mineral content of ulva latuca is quite high, so this plant has the potential to produce several minerals that are useful for health, have antioxidant, antibacterial, antifungal, anti-inflammatory properties and can be used as a face mask. The potential of ulva latuca allows this plant to receive special attention to be developed and also developed equipment in the process of utilizing several minerals contained in Ulva latuca. Keywords: Ulva Latuca, Mineral Content, Health, Potential Products, Utilization.
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Widowaty, Windy, Yopi Setiawan, and Wildan Wibawa Perdana. "AKTIVITAS ANTIOKSIDAN EKSTRAK METANOL Gracilaria sp. DAN Ulva sp. DARI PANTAI SAYANG HEULANG." AGROSCIENCE (AGSCI) 10, no. 2 (2020): 203. http://dx.doi.org/10.35194/agsci.v10i2.1163.
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Rumput laut atau makro alga merupakan sudah sejak lama di Indonesia dikenal sebagai bahan makanan tambahan, sayuran dan obat tradisional. Gracilaria sp mengandung banyak metabolit seperti : karoten, terpenoid, xantofil, klorofil, vitamin, dan beberapa senyawa antioksidan sementara senyawa bioaktif tersebut terkandung pada Ulva sp yang disebut dengan istilah ulvan, yaitu Sulfated Polysaccharide. Kedua jenis rumput laut tersebut banyak ditemukan di pantai Sayang Heulang, Garut Jawa Barat. Antioksidan yang terkandung dalam Ulva sp bersifat alami, tidak seperti antioksidan sintetis, seperti Butylated Hydroxyanisole (BHA) dan Butylated Hydroxytoluene (BHT) yang dapat mengganggu fungsi hati dan bersifat karsinogenik. Radikal bebas (free radical) merupakan salah satu bentuk senyawa dengan memiliki elektron yang tidak berpasangan dimana senyawa tersebut sangat reaktif mencari pasangan elektron dari molekul lain yang ada disekitarnya agar menstabilkan diri. Antioksidan ini berfungsi untuk membantu melindungi tubuh dari serangan radikal bebas dan meredam dampak negatifnya. Selain daripada itu, antioksidan pun dapat berkomponen untuk melindungi sel dari kerusakan yang diakibatkan oleh reaktif oksigen spesies seperti oksigen singlet, superoksida, radikal hidroksil, radikal peroksil dan peroksi nitrit. Pada penelitian ini dilakukan pengujian aktivitas antioksidan dari dua jenis rumput laut yang berasal dari pantai Sayang Heulang Garut, Jawa Barat yaitu jenis Gracilaria sp dan Ulva sp dengan menggunakan metoda DPPH. Untuk mendapatkan ekstrak kasar rumput laut tersebut, maka dilakukan ekstraksi dengan metode Folch yang telah dimodifikasi (metanol : kloroform : buffer fosfat, 2:1:0,8 (v/v)). Ekstrak yang dihasilkan masing – masing diuji aktivitas antioksidanya dengan menggunakan metode DPPH. Hasil penelitian tersebut, menunjukkan bahwa ekstrak kasar Gracilaria sp dan Ulva sp memiliki aktivitas antioksidan masing – masing sebesar 221,76 µg/mL dan 404,73 µg/mL.
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García-Márquez, Jorge, Bruna Rodrigues Moreira, Piedad Valverde-Guillén, et al. "In Vitro and In Vivo Effects of Ulvan Polysaccharides from Ulva rigida." Pharmaceuticals 16, no. 5 (2023): 660. http://dx.doi.org/10.3390/ph16050660.
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One of the main bioactive compounds of interest from the Ulva species is the sulfated polysaccharide ulvan, which has recently attracted attention for its anticancer properties. This study investigated the cytotoxic activity of ulvan polysaccharides obtained from Ulva rigida in the following scenarios: (i) in vitro against healthy and carcinogenic cell lines (1064sk (human fibroblasts), HACAT (immortalized human keratinocytes), U-937 (a human leukemia cell line), G-361 (a human malignant melanoma), and HCT-116 (a colon cancer cell line)) and (ii) in vivo against zebrafish embryos. Ulvan exhibited cytotoxic effects on the three human cancer cell lines tested. However, only HCT-116 demonstrated sufficient sensitivity to this ulvan to make it relevant as a potential anticancer treatment, presenting an LC50 of 0.1 mg mL−1. The in vivo assay on the zebrafish embryos showed a linear relationship between the polysaccharide concentration and growth retardation at 7.8 hpf mL mg−1, with an LC50 of about 5.2 mg mL−1 at 48 hpf. At concentrations near the LC50, toxic effects, such as pericardial edema or chorion lysis, could be found in the experimental larvae. Our in vitro study supports the potential use of polysaccharides extracted from U. rigida as candidates for treating human colon cancer. However, the in vivo assay on zebrafish indicated that the potential use of ulvan as a promising, safe compound should be limited to specific concentrations below 0.001 mg mL−1 since it revealed side effects on the embryonic growth rate and osmolar balance.
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Ulaan, Gia Aprilia Kartini, Adithya Yudistira, and Henki Rotinsulu. "UJI AKTIVITAS ANTIOKSIDAN EKSTRAK ETANOL ALGA Ulva lactuca MENGGUNAKAN METODE DPPH (1,1 diphenyl-2-picrylhydrazyl)." PHARMACON 8, no. 3 (2019): 535. http://dx.doi.org/10.35799/pha.8.2019.29327.
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Ulva lactuca Algae habitat was found in shallow marine waters and its morphology is thin and flat thallus. Ulva lactuca Algae, known as sea lettuce, contains a lot of chlorophyll in its cells. Chlorophyll has the ability as a free radical scavenger and also has antioxidant activity. Antioxidants are compounds that could inhibit oxidation reactions by binding to free radicals and highly reactive molecules. This study was conducted to determine the antioxidant activity of ethanol extract of Algae Ulva lactuca obtained from the Lembeh Strait, Bitung City. Ulva lactuca Algae was extracted by maceration method using ethanol solvent. Testing of antioxidant activity was carried out using the DPPH method, which was measured using a UV-VIS spectrophotometer. The results showed that the ethanol extracts of Ulva lactuca Algae had antioxidant activity with a percentage value of 51.63% at a concentration of 100 mg/L. Keywords : Ulva lactuca Algae, Antioxidants, Ethanol, DPPHABSTRAKHabitat tumbuhan Alga Ulva lactuca terdapat di air laut dan morfologinya berupa thallus tipis dan gepeng. Alga Ulva lactuca yang dikenal dengan selada laut, banyak mengandung klorofil dalam sel-selnya. Klorofil memiliki kemampuan sebagai penangkap radikal bebas dan juga memiliki aktivitas antioksidan. Antioksidan merupakan senyawa yang dapat menghambat reaksi oksidasi dengan cara mengikat radikal bebas dan molekul yang sangat reaktif. Penelitian ini dilakukan untuk mengetahui aktivitas antioksidan dari ekstrak etanol Alga Ulva lactuca yang diperoleh dari Peraian Selat Lembeh, Kota Bitung. Alga Ulva lactuca diekstrak dengan metode maserasi menggunakan pelarut etanol. Pengujian aktivitas antioksidan dilakukan dengan metode DPPH yang di ukur menggunakan Spektrofotometer UV-VIS. Hasil penelitian menunjukkan bahwa ekstrak etanol Alga Ulva lactuca memiliki aktivitas antioksidan dengan nilai presentase sebesar 51,63% pada konsentrasi 100 mg/L. Kata kunci : Alga Ulva lactuca, Antioksidan, Etanol, DPPH
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NG, YU FEI, and DANWEI HUANG. "Species diversity and phylogeny of the green macroalga Ulva (Ulvophyceae, Chlorophyta) in Singapore." Phytotaxa 662, no. 1 (2024): 67–79. http://dx.doi.org/10.11646/phytotaxa.662.1.5.
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The green macroalgal genus Ulva (Ulvaceae, Ulvophyceae, Chlorophyta) is commonly found in coastal ecosystems and confers many important marine ecological services. Despite prior research interest and recent advancements in Ulva taxonomy, in many parts of the world, its species diversity remains unresolved due to a high degree of morphological variation and phenotypic plasticity. DNA barcoding and phylogenetic approaches can potentially assist in identifying Ulva species precisely. Here, we analysed chloroplast tufA, rbcL and nuclear ITS from 49 Ulva specimens from Singapore. Gross and microscopic morphological examinations were also performed to characterise the morphological range of each species. Our results confirm the presence of three Ulva species in Singapore, all of which are new local records: U. meridionalis, U. ohnoi, and U. tepida. Although 10 Ulva species have been historically recorded in Singapore, none of them were found in the present study, likely due to prior misidentification, limited seasonal sampling, or local extirpations. Ulva ohnoi shows high morphological variation with five morphotypes. This study demonstrates that molecular analyses combined with morphological examinations are useful for characterising Ulva diversity.
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Ning, Limin, Zhong Yao, and Benwei Zhu. "Ulva (Enteromorpha) Polysaccharides and Oligosaccharides: A Potential Functional Food Source from Green-Tide-Forming Macroalgae." Marine Drugs 20, no. 3 (2022): 202. http://dx.doi.org/10.3390/md20030202.
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The high-valued utilization of Ulva (previously known as Enteromorpha) bioresources has drawn increasing attention due to the periodic blooms of world-wide green tide. The polysaccharide is the main functional component of Ulva and exhibits various physiological activities. The Ulva oligosaccharide as the degradation product of polysaccharide not only possesses some obvious activities, but also possesses excellent solubility and bioavailability. Both Ulva polysaccharides and oligosaccharides hold promising potential in the food industry as new functional foods or food additives. Studies on Ulva polysaccharides and oligosaccharides are increasing and have been the focus of the marine bioresources field. However, the comprehensive review of this topic is still rare and do not cover the recent advances of the structure, isolation, preparation, activity and applications of Ulva polysaccharides and oligosaccharides. This review systematically summarizes and discusses the recent advances of chemical composition, extraction, purification, structure, and activity of Ulva polysaccharides as well as oligosaccharides. In addition, the potential applications as new functional food and food additives have also been considered, and these will definitely expand the applications of Ulva oligosaccharides in the food and medical fields.
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Afanasyev, D. F., and Sh R. Abdullin. "On a new vegetation association of the Black Sea pseudolittoral zone." Vegetation of Russia, no. 23 (2013): 3–8. http://dx.doi.org/10.31111/vegrus/2013.23.3.
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A new association of macrophytic algae Ulvo compressae–Cladophoretum albidae of the Russian Black Sea pseudolittoral zone is described. The association seems to be related to the alliance Ralfsion verrucosae Giaccone 1993. The diagnostic species of the association are Ulva compressa and Cladophora albida. Two variants of the association have been described. Diagnoses of the association and its variants are given.
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Mahasu, Nur Hikma, Dedi Jusadi, Mia Setiawati, and I. Nyoman Adi Asmara Giri. "POTENTIAL USE OF Ulva lactuca AS FEED INGREDIENT FOR TILAPIA." Jurnal Ilmu dan Teknologi Kelautan Tropis 8, no. 1 (2016): 259–67. http://dx.doi.org/10.29244/jitkt.v8i1.13089.
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Due to the mainly imported for fish feed ingredients in Indonesia, many attemps have been made to discover local potential ingredients to reduce the utilization of imported ingredients. In this experiment, the utilization of Ulva lactuca as feed ingredient for tilapia was evaluated. Experiment 1 was conducted to determine the digestibility of Ulva for tilapia. In experiment 2 and 3, Ulva was used to substitute wheat pollard of either 0, 3, 6, 9, or 12 % in the feed formulation. In experiment 2, fish with an average body weight of 4.1±0.15 g were fed on those diets, and were cultured for 55 days. To calculate the digestibity in experiment 3, Cr2O3 was added into the diet of exeriment 2; then fed on the fish with an average body weight of 19.0±0.67 g. Results showed that apparent digestibility of dry matter and crude protein of Ulva were 66.3 and 83 %, respectively. Ash content in the diet increased of 13.5% with Ulva inclusion of 12%. On the other hand, using Ulva as a substitute for pollard up to 12% was not affected the growth performance of fish. Regardless of the Ulva level in the diet, the digestibility of the diet was the same. Therefore, Ulva is a potential source of local feed ingredient for tilapia. Keywords: Ulva lactuca, tilapia, digestibility, growth
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Chatzoglou, Evanthia, Panorea Kechagia, Aristeidis Tsopelakos, and Helen Miliou. "Co-culture of Ulva sp. and Dicentrarchus labrax in Recirculating Aquaculture System: effects on growth, retention of nutrients and fatty acid profile." Aquatic Living Resources 33 (2020): 19. http://dx.doi.org/10.1051/alr/2020023.
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European sea bass and Ulva sp. were co-cultured in different tanks of an indoor Recirculating Aquaculture System (Ulva-RAS) with bacterial biofilter, in an effort to optimize the efficiency of the system and to further decrease the waste effluent. A system with similar culture conditions, without Ulva, was used as a control-RAS to elucidate integration effects on growth performance and chemical composition of sea bass. The role of Ulva on N and P concentrations, gas (O2, CO2) and pH in water was also investigated. Fish were fed a diet of fish oil replacement (55%) with a mixture of rapeseed oil and palm oil (1:1). Our data showed that Ulva could uptake N and P nutrients, but could also enrich sea water with phosphates. Sea bass reared in Ulva-RAS exhibited isometric growth, while fish in control-RAS showed a positive allometric growth and an increased variance of body weight and length. In addition, sea bass in Ulva-RAS demonstrated significantly higher levels of condition factor (K), feed intake, protein, lipid, P, EPA and DHA content (% wet weight of total body) and lipid productive value, compared to fish in control-RAS. Ulva, after bi-weekly culture, showed increased protein content (60%) compared to wild seaweed collected nearshore. Cultivated Ulva obtained dark green color, doubled chlorophyll concentrations, and exhibited lower levels of saturated and higher levels of certain monounsaturated and n-3 polyunsaturated fatty acids, indicating increased photosynthetic activity. Present results revealed the beneficial effects of Ulva on sea bass growth and quality, which led to an improved response to the nutritional stress imposed by the fish oil replacement with vegetable oils, thus contributing to a sustainable aquaculture. Moreover, it was concluded that Ulva could improve water quality by increasing pH and O2, reducing CO2 and contribute to bioremediation of ammonia and nitrates from water in integrated aquaculture.
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Tran, Vy Ha Nguyen, Maria Dalgaard Mikkelsen, Hai Bang Truong, et al. "Structural Characterization and Cytotoxic Activity Evaluation of Ulvan Polysaccharides Extracted from the Green Algae Ulva papenfussii." Marine Drugs 21, no. 11 (2023): 556. http://dx.doi.org/10.3390/md21110556.
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Ulvan, a sulfated heteropolysaccharide with structural and functional properties of interest for various uses, was extracted from the green seaweed Ulva papenfussii. U. papenfussii is an unexplored Ulva species found in the South China Sea along the central coast of Vietnam. Based on dry weight, the ulvan yield was ~15% (w/w) and the ulvan had a sulfate content of 13.4 wt%. The compositional constitution encompassed L-Rhamnose (Rhap), D-Xylose (Xylp), D-Glucuronic acid (GlcAp), L-Iduronic acid (IdoAp), D-Galactose (Galp), and D-Glucose (Glcp) with a molar ratio of 1:0.19:0.35:0.52:0.05:0.11, respectively. The structure of ulvan was determined using High-Performance Liquid Chromatography (HPLC), Fourier Transform Infrared Spectroscopy (FT-IR), and Nuclear Magnetic Resonance spectroscopy (NMR) methods. The results showed that the extracted ulvan comprised a mixture of two different structural forms, namely (“A3s”) with the repeating disaccharide [→4)-β-D-GlcAp-(1→4)-α-L-Rhap 3S-(1→]n, and (“B3s”) with the repeating disaccharide [→4)-α-L-IdoAp-(1→4)-α-L-Rhap 3S(1→]n. The relative abundance of A3s, and B3s was 1:1.5, respectively. The potential anticarcinogenic attributes of ulvan were evaluated against a trilogy of human cancer cell lineages. Concomitantly, Quantitative Structure–Activity Relationship (QSAR) modeling was also conducted to predict potential adverse reactions stemming from pharmacological interactions. The ulvan showed significant antitumor growth activity against hepatocellular carcinoma (IC50 ≈ 90 µg/mL), human breast cancer cells (IC50 ≈ 85 µg/mL), and cervical cancer cells (IC50 ≈ 67 µg/mL). The QSAR models demonstrated acceptable predictive power, and seven toxicity indications confirmed the safety of ulvan, warranting its candidacy for further in vivo testing and applications as a biologically active pharmaceutical source for human disease treatment.
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Perdani, A. W., N. Ratnaningsih, I. Chayati, and N. N. Utami. "Nutritional, physicochemical and sensory evaluation of biscuits enriched with Ulva sp. from Gunungkidul coast." Food Research 8, Supplementary 2 (2024): 22–29. http://dx.doi.org/10.26656/fr.2017.8(s2).34.
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Ulva sp. a seaweed commonly found on Gunungkidul coast, had the potential as a source of functional food that contained high antioxidants, protein and dietary fiber. Ulva sp. was developed into biscuits, one of the most popular foods in Indonesia. This study aimed to investigate the physicochemical and sensory evaluation of biscuits enriched with Ulva sp. The nutritional value, antioxidant activity, dietary fiber, texture, color, appearance and sensory evaluation were studied. Ulva sp. was collected from Gunungkidul coast and treated using 5% lime for fishy-smell removal, then dried to produce Ulva sp. powder. The Ulva sp. powder was used for biscuit enrichment with 0% powder (STD), 3% powder (BC3), 5% powder (BC5) and 7% powder (BC7) substitution. Biscuits enriched with Ulva sp. increased the protein, fat, and ash content, while the carbohydrate content decreased (p<0.05). The more Ulva sp. was substituted in biscuits, the higher antioxidant activities and dietary fibers were measured (p<0.05). The crunchiness of BC5 (139.95±28.84 Nmm) was high, and no significant difference with STD (393.05±34.11 Nmm), while the crispiness and the hardness of enriched biscuits were lower than STD. The lightness (L*), redness (a*), and yellowness (b*) of enriched biscuits were lower than STD because the Ulva sp. powder contributed to giving dark-greenish colors. Sensory evaluation showed that BC5 was the most well-liked by the panellist in terms of its appearance, aroma, taste, flavor, texture, aftertaste, and overall (there was no difference with STD). Thus, biscuits enriched with Ulva sp. were confirmed to improve nutritional and physicochemical, and it has sensory evaluation acceptance.
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Azhar, Nuril, Ervia Yudiati, Ambariyanto, and Agus Trianto. "The Effect of Enhancing Ulvan's Antioxidant Properties in Supplemented Diets on Accelerating The Phenoloxidase Immune Response in White Shrimp." HAYATI Journal of Biosciences 31, no. 6 (2024): 1116–29. http://dx.doi.org/10.4308/hjb.31.6.1116-1129.
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This study investigated the total phenol content (TPC) and DPPH inhibition of ulvan from Ulva lactuca, along with its supplementation effects on the specific growth rate (SGR) and phenoloxidase (PO) activity of Litopenaeus vannamei. Ulva lactuca samples were processed to obtain four ulvan extracts using different methods such as P-HWE (Polysaccharide-Hot Water Extract), O-HWE (Oligosaccharide-Hot Water Extract), P-A-HWE (Polysaccharide-Acid-Hot Water Extract), and O-A-HWE (Oligosaccharide-Acid-Hot Water Extract). The U. lactuca powder was treated with 80% ethanol overnight, then centrifuged and dried. Depigmented U. lactuca was extracted with water (65°C, 2 hours), and polysaccharides were precipitated with 99% ethanol, yielding P-HWE. P-HWE was heated at 145°C for 4.5 hours to yield O-HWE. Another extraction after depigmentation, using water containing H2O2 and ascorbic acid (65°C, 2 hours), precipitated P-A-HWE, which was dried and heated to yield O-A-HWE. FTIR analysis provided insights into the chemical composition and structural characteristics of ulvan extracts. TPC and DPPH inhibition were measured spectrophotometrically, and PO activity using a colorimetric assay with L-DOPA. Ulvan supplementation in shrimp feed was evaluated for growth and immune response. Results showed significant differences in TPC, DPPH inhibition, and PO activity among extracts, with O-A-HWE having the highest phenol content and DPPH inhibition. Ulvan supplementation significantly influenced the SGR of L. vannamei, with the highest SGR in the O-A-HWE treatment. This study suggests that ulvan extracts, especially O-A-HWE, could be effective natural immunostimulants for enhancing the health and growth of L. vannamei, warranting further research to optimize extraction methods and understand the underlying mechanisms.
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Le, Bao, Kirill S. Golokhvast, Seung Hwan Yang, and Sangmi Sun. "Optimization of Microwave-Assisted Extraction of Polysaccharides from Ulva pertusa and Evaluation of Their Antioxidant Activity." Antioxidants 8, no. 5 (2019): 129. http://dx.doi.org/10.3390/antiox8050129.
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The use of green marine seaweed Ulva spp. as foods, feed supplements, and functional ingredients has gained increasing interest. Microwave-assisted extraction technology was employed to improve the extraction yield and composition of Ulva pertusa polysaccharides. The antioxidant activity of ulvan was also evaluated. The impacts of four independent variables, i.e., extraction time (X1, 30 to 60 min), power (X2, 500 to 700 W), water-to-raw-material ratio (X3, 40 to 70), and pH (X4, 5 to 7) were evaluated. The chemical structure of different polysaccharides fractions was investigated via FT-IR and the determination of their antioxidant activities. A response surface methodology based on a Box–Behnken design (BBD) was used to optimize the extraction conditions as follows: extraction time of 43.63 min, power level of 600 W, water-to-raw-material ratio of 55.45, pH of 6.57, and maximum yield of 41.91%, with a desired value of 0.381. Ulvan exerted a strong antioxidant effect against 1,1-diphenyl-2-picrylhydrazyl (DPPH) and 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) (ABTS) and showed reducing power in vitro. Ulvan protected RAW 264.7 cells against H2O2-induced oxidative stress by upregulating the expression and enhancing the activity of oxidative enzymes such as superoxide dismutase (SOD) and superoxide dismutase (CAT). The results suggest that the polysaccharides from U. pertusa might be promising bioactive compounds for commercial use.
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Obolski, Uri, Thomas Wichard, Alvaro Israel, Alexander Golberg, and Alexander Liberzon. "Modeling the growth and sporulation dynamics of the macroalga <i>Ulva</i> in mixed-age populations in cultivation and the formation of green tides." Biogeosciences 19, no. 8 (2022): 2263–71. http://dx.doi.org/10.5194/bg-19-2263-2022.
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Abstract. Ulva is a widespread green algal genus with important ecological roles and promising potential as a seagriculture crop. One of the major challenges when cultivating Ulva is sudden biomass disappearance, likely caused by uncontrolled and unpredicted massive sporulation. However, the dynamics of this process are still poorly understood. In this study, we propose a mathematical model describing the biomass accumulation and degradation of Ulva, considering the potential impact of sporulation inhibitors. We developed a differential equation model describing the time evolution of Ulva biomass. Our model simulates biomass in compartments of different Ulva “age” classes, with varying growth and sporulation rates. Coupled with these classes is a differential equation describing the presence of a sporulation inhibitor, produced and secreted by the algae. Our model mimics observed Ulva dynamics. We present Ulva's biomass accumulation under different initial algae population, age distributions and sporulation rates. Furthermore, we simulate water replacement, effectively depleting the sporulation inhibitor, and examine its effects on Ulva's biomass accumulation. The model developed in this work is the first step towards understanding the dynamics of Ulva growth and degradation. Future work refining and expanding our results should prove beneficial to the ecological research and industrial growth of Ulva.
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Hasnadewi, Ashfiya Hanif, Mulyati Mulyati, Ardaning Nuriliani, and Fajar Sofyantoro. "In Vivo Evaluation of Heavy Metal Decontaminated Marine Macroalgae (Ulva lactuca L.) Using Bilimbi (Averrhoa bilimbi) Juice and Its Potency As Nephroprotector." Indonesian Food and Nutrition Progress 20, no. 1 (2023): 1. http://dx.doi.org/10.22146/ifnp.85312.
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Ulva lactuca is a functional food ingredient with high antioxidant content. The presence of heavy metal contaminants in natural Ulva lactuca needs to be eliminated. Ulva lactuca was investigated for its potential as a nephroprotector in female Wistar rats. The study assessed Blood Urea Nitrogen (BUN) levels, creatinine levels, and kidney histopathology. The experiment included a Group I (control), Group II (administered 1000 mg/Kg BW/day of natural Ulva lactuca), and Group III (administered 1000 mg/Kg BW/day of heavy metal decontaminated Ulva lactuca using bilimbi juice). After 30 days of oral treatment, no significant differences were observed in BUN levels before and after treatment. However, significant variations were found in Group III compared to the Group I creatinine levels after treatment. Both natural and heavy metal decontaminated Ulva lactuca showed no adverse effects on kidney function. Notably, heavy metal decontaminated Ulva lactuca exhibited improved kidney histopathology, suggesting its potential as a nephroprotector. Further research is needed to explore its broader applications in promoting kidney health.
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Huang, Ailan, Xinming Wu, Fuping Lu, and Fufeng Liu. "Sustainable Production of Ulva Oligosaccharides via Enzymatic Hydrolysis: A Review on Ulvan Lyase." Foods 13, no. 17 (2024): 2820. http://dx.doi.org/10.3390/foods13172820.
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Ulvan is a water-soluble sulfated polysaccharide extracted from the green algae cell wall. Compared with polysaccharides, oligosaccharides have drawn increasing attention in various industries due to their enhanced biocompatibility and solubility. Ulvan lyase degrades polysaccharides into low molecular weight oligosaccharides through the β-elimination mechanism. The elucidation of the structure, catalytic mechanism, and molecular modification of ulvan lyase will be helpful to obtain high value-added products from marine biomass resources, as well as reduce environmental pollution caused by the eutrophication of green algae. This review summarizes the structure and bioactivity of ulvan, the microbial origin of ulvan lyase, as well as its sequence, three-dimensional structure, and enzymatic mechanism. In addition, the molecular modification of ulvan lyase, prospects and challenges in the application of enzymatic methods to prepare oligosaccharides are also discussed. It provides information for the preparation of bioactive Ulva oligosaccharides through enzymatic hydrolysis, the technological bottlenecks, and possible solutions to address these issues within the enzymatic process.
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Madany, Marwa A., Mohamed S. Abdel-Kareem, Affaf K. Al-Oufy, Medhat Haroun, and Salah A. Sheweita. "The biopolymer ulvan from Ulva fasciata: Extraction towards nanofibers fabrication." International Journal of Biological Macromolecules 177 (April 2021): 401–12. http://dx.doi.org/10.1016/j.ijbiomac.2021.02.047.
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Keintjem, Brigieta, Defny S. Wewengkang, and Fatimawali Fatimawali. "AKTIVITAS PENGHAMBATAN PERTUMBUHAN MIKROORGANISME DARI EKSTRAK DAN FRAKSI ALGA Ulva lactuca TERHADAP Escherichia coli, Staphylococcus aureus, DAN Candida albicans." PHARMACON 8, no. 2 (2019): 397. http://dx.doi.org/10.35799/pha.8.2019.29306.
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ABSTRACT Algae have long been used for the treatment of various types of diseases. Ulva lactuca is one of the algae, which contains bioactive substances as antimicrobial, antifungal, and antioxidant. This study aims to determine the microorganisms growth inhibitory activity from Ulva lactuca algae obtained from the of Lembeh Strait waters in City of Bitung against microorganisms Escherichia coli, Staphylococcus aureus and Candida albicans. Ulva lactuca algae was extracted using maceration method with ethanol solvent and fractionated with methanol, n-hexan and chloroform solvents. Testing of antimicrobial activity using agar diffusion method. The result showed that extracts and fractions of Ulva lactuca algae did not have antimicrobial activity against the microorganisms Escherichia coli, Staphylococcus aureus and Candida albicans. The chemical composition of algae is influenced by season, geographical distribution, as well as environmental factors such as temperature, water, salinity, light, nutrition, and mineral availability.Keywords: Ulva lactuca, Antimicrobials, Maseration, Fractions, Agar DiffusionABSTRAK Alga telah lama digunakan untuk keperluan pengobatan berbagai jenis penyakit. Ulva lactuca merupakan salah satu alga yang memiliki kandungan zat bioaktif sebagai antimikroba. Penelitian ini bertujuan untuk mengetahui adanya aktivitas penghambat pertumbuhan mikroorganisme dari alga Ulva lactuca yang diperoleh dari perairan Selat Lembeh kota Bitung terhadap mikroba Escherichia coli, Staphylococcus aureus, dan Candida albicans. Alga Ulva lactuca diekstraksi menggunakan metode maserasi dengan pelarut etanol dan difraksinasi dengan pelarut methanol, n-hexan, dan kloroform. Pengujian aktivitas antimikroba menggunakan metode difusi agar. Hasil penelitian menunjukkan ekstrak dan fraksi dari alga Ulva lactuca tidak memiliki aktivitas antimikroba terhadap Escherichia coli, Staphylococcus aureus, dan Candida albicans. Komposisi kimia alga dipengaruhi oleh musim, distribusi geografis, serta faktor lingkungan seperti suhu, air, salinitasi, cahaya, nutrisi, dan ketersediaan mineral.Kata kunci : Alga Ulva lactuca, Antimikroba, Maserasi, Fraksi, Difusi Agar
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Zhang, Hailong, Quan Qin, Deyong Sun, Xiaomin Ye, Shengqiang Wang, and Zhixin Zong. "Automatic Detection of Floating Ulva prolifera Bloom from Optical Satellite Imagery." Journal of Marine Science and Engineering 12, no. 4 (2024): 680. http://dx.doi.org/10.3390/jmse12040680.
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Annual outbreaks of floating Ulva prolifera blooms in the Yellow Sea have caused serious local environmental and economic problems. Rapid and effective monitoring of Ulva blooms from satellite observations with wide spatial-temporal coverage can greatly enhance disaster response efforts. Various satellite sensors and remote sensing methods have been employed for Ulva detection, yet automatic and rapid Ulva detection remains challenging mainly due to complex observation scenarios present in different satellite images, and even within a single satellite image. Here, a reliable and fully automatic method was proposed for the rapid extraction of Ulva features using the Tasseled-Cap Greenness (TCG) index from satellite top-of-atmosphere reflectance (RTOA) data. Based on the TCG characteristics of Ulva and Ulva-free targets, a local adaptive threshold (LAT) approach was utilized to automatically select a TCG threshold for moving pixel windows. When tested on HY1C/D-Coastal Zone Imager (CZI) images, the proposed method, termed the TCG-LAT method, achieved over 95% Ulva detection accuracy though cross-comparison with the TCG and VBFAH indexes with a visually determined threshold. It exhibited robust performance even against complex water backgrounds and under non-optimal observing conditions with sun glint and cloud cover. The TCG-LAT method was further applied to multiple HY1C/D-CZI images for automatic Ulva bloom monitoring in the Yellow Sea in 2023. Moreover, promising results were obtained by applying the TCG-LAT method to multiple optical satellite sensors, including GF-Wide Field View Camera (GF-WFV), HJ-Charge Coupled Device (HJ-CCD), Sentinel2B-Multispectral Imager (S2B-MSI), and the Geostationary Ocean Color Imager (GOCI-II). The TCG-LAT method is poised for integration into operational systems for disaster monitoring to enable the rapid monitoring of Ulva blooms in nearshore waters, facilitated by the availability of near-real-time satellite images.
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Gastaldi, Marianela, Fausto Nahuel Firstater, Pedro Daleo, and Maite Andrea Narvarte. "Abundance of the sponge Hymeniacidon cf. perlevis in a stressful environment of Patagonia: relationships with Ulva lactuca and physical variables." Journal of the Marine Biological Association of the United Kingdom 96, no. 2 (2015): 465–72. http://dx.doi.org/10.1017/s0025315415001198.
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Understanding the variables (biotic or abiotic) controlling coastal communities is the main goal of ecology research and it is crucial to predict how communities will evolve under the increasing pressure on coastal systems by human activities. The general aims of this study were to assess the variables affecting the distribution of the fast-growing sponge Hymeniacidon cf. perlevis, and to evaluate if physical stressful conditions have an influence in the relationship between Hymeniacidon and the sea lettuce Ulva lactuca. Specifically, the aims were to evaluate the abundance patterns of Hymeniacidon and Ulva and to assess the relationship of Ulva and physical variables on the abundance of Hymeniacidon at both intertidal and subtidal. Hymeniacidon and Ulva showed opposite abundance patterns. Hymeniacidon was more abundant in sites without Ulva, and negatively correlated with Ulva abundance at both heights. Intertidal Hymeniacidon abundance was not correlated with physical variables, but subtidal Hymeniacidon was.
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Chi, Yongzhou, Huining Li, Pei Wang, et al. "Structural characterization of ulvan extracted from Ulva clathrata assisted by an ulvan lyase." Carbohydrate Polymers 229 (February 2020): 115497. http://dx.doi.org/10.1016/j.carbpol.2019.115497.
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Du, Yu, Yuan Ao, Yuan He, et al. "Temporal succession of community structure and biphase ratio in a natural population of Ulva spp. (Chlorophyta) attached to Pyropia rafts in the Yellow Sea, China." Botanica Marina 62, no. 6 (2019): 549–61. http://dx.doi.org/10.1515/bot-2018-0115.
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Abstract Green tide algal blooms occur worldwide, especially in China’s Yellow Sea, and have caused serious damage to local ecological environments and economies. As a dominant agent of green tides, the green macroalga Ulva has caused widespread concern. In this study, phylogenetic clades were constructed among related Ulva species isolated from Pyropia rafts at six sites over 1.5 years based on internal transcribed spacer (ITS) and tufA sequences. In addition, traditional observation ploidy methods and flow cytometry methods were used to analyse continuous change in the biphase and sex ratios of Ulva species and to assess the changes in phase advantages over time. The results showed that the perennial Ulva populations on rafts mainly consisted of Ulva flexuosa and Ulva prolifera, and the biphasic dominance of the attached Ulva populations changed with the seasons: sporophytes were predominant mainly in winter and spring, and gametophytes were predominant mainly in summer and autumn. At the same time, there were some differences in gametophyte and sporophyte frequencies (mainly sporophyte biased) compared to the null model prediction of a √2:1 ratio, while the sex ratio of male and female gametophytes remained 1:1 throughout the year. Our results indicate the presence of both phases of bloom-forming species of Ulva in green tides year round, and that multiple generations coexist and grow continuously.
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KRUPNIK, NIMROD, GUY PAZ, JACOB DOUEK, et al. "Native, invasive and cryptogenic Ulva species from the Israeli Mediterranean Sea: risk and potential." Mediterranean Marine Science 19, no. 1 (2018): 132. http://dx.doi.org/10.12681/mms.2104.
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The genus Ulva (Chlorophyta) is ubiquitous along Israeli Mediterranean shores where it has been studied extensively due to its important ecological role and potential value in biotechnology and aquaculture. Previous identifications of Ulva in Israel were based only on morphology. Here, we compare species found in 2002 and in 2014-2016. Analyses of ribulose-1,5-bisphosphate carboxylase/oxygenase (rbcL) and elongation factor 1-alpha (tufA) plastid genes (2014-2016 samples only), combined with morphological data, identified six Ulva species, three of which are new records for Israel and probably originate from the Indo-Pacific. Ulva compressa, rarely found in 2002, is now the most abundant species and exhibits two fairly distinct morphologies correlated with different haplotypes for both genes. Ulva fasciata was found more commonly in 2002 than in 2014-16, whereas the morphologically similar, and closely related, invasive species U. ohnoi seemed more frequent in recent samples. The finely branched tubular Ulva tepida was found in 2002 and 2015/16, and U. chaugulii and U. mediterranea were discovered for the first time in 2015/16. The changing Ulva flora of the Israeli Mediterranean may be correlated with major environmental changes including 3°C increase in sea surface temperatures over the last two decades, as well as a generally increasing prevalence of non-native species. The local Ulva species now found in Israel could be of value for various industrial uses.
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Metungun, Jakomina, Mariana Yerminal Beruatjaan, Hendro Hitijahubessy, and Endang Tamher. "Analisis Kemampuan dari Ekstrak Etanol Rumput Laut Ulva lactuca Sebagai Antibakteri Vibrio sp. dan Kajian Fitokimianya." Biofaal Journal 4, no. 2 (2023): 100–107. http://dx.doi.org/10.30598/biofaal.v4i2pp100-107.
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An analysis of the antibacterial ability of Vibrio sp. has been carried out from the ethanol extract of Ulva lactuca seaweed and its phytochemical study. Analysis of the antibacterial ability of Vibrio sp. using the disk diffusion method was the main thing carried out in this research, then the extract yield was calculated from the maceration process of Ulva lactuca seaweed, as well as phytochemical analysis to support the antibacterial ability of Ulva lactuca seaweed against the bacteria Vibrio sp. The results of the extraction of Ulva lactuca seaweed with ethanol solvent obtained a yield of 3.67%. The results showed a moderate antibacterial activity of Vibrio sp. from Ulva lactuca seaweed extract at a concentration of 100% was 17.3 mm. Weak antibacterial activity was at a concentration of 75% of 12.525 mm and extracts below a concentration of 75% did not have inhibitory power against Vibrio sp bacteria. Phytochemical studies of Ulva lactuca seaweed found secondary metabolite compounds in the form of alkaloids, flavonoids, steroids, tannins and saponins. Based on the results of this research, it is hoped that the antibacterial ability of Vibrio sp. can be further investigated from ethanol extract of Ulva lactuca seaweed in vivo.