Relevant bibliographies by topics / Micro algae

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Academic literature on the topic 'Micro algae'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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Journal articles on the topic "Micro algae"

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Cui, Jian Sheng, Xiao Hui Xu, and Yu Xin Cheng. "Study on the Characteristics of Microcystis aeruginosa Chlorophyll Fluorescence Responding on the Toxicity of HgCl2." Advanced Materials Research 726-731 (August 2013): 1538–43. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.1538.

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Chlorophyll fluorescence is a quick, precise, non-invasive technique which has been widely used in studies of photosynthesis in micro algae, particularly for investigations of stress physiology of micro algae. The toxicity of heavy metal Hg2+on algaM. aeruginosawas studied by the change in fluorescence intensity ofM. aeruginosaat 435 nm/680 nm which treaded with different Hg2+concentrations for 25 min. The results showed that high concentrations of Hg2+inhibited the photosynthesis ofM. aeruginosa, while a low concentration (0.0005 mg/L) of Hg2+promoted photosynthesis. When Hg2+level range from 0.001 mg/L to 0.500 mg/L, it had significant inhibition effects on photosynthesis ofM. aeruginosa. The chlorophyll fluorescence intensity increased with the concentration of Hg2+(0.001~0.400 mg/L), even the concentration of Hg2+and algal photosynthetic signal had a significant positive correlation, r=0.983 3.
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Alfaro, Andrea C., W. Lindsey Zemke-White, and Winifereti Nainoca. "Faunal composition within algal mats and adjacent habitats on Likuri Island, Fiji Islands." Journal of the Marine Biological Association of the United Kingdom 89, no. 2 (November 17, 2008): 295–302. http://dx.doi.org/10.1017/s0025315408002774.

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The faunal composition within three mono-specific algal habitats was investigated at Likuri Island, southern Viti Levu, Fiji Islands. Gracilaria maramae was the dominant alga within algal drift mat, seagrass bed, and rocky substrate habitats at the study site. This algal species exhibits two distinctive morphologies depending on whether it is attached or loose-lying. When attached to seagrass blades or rocky substrates, this alga has long straight branches stemming from a single holdfast, while detached individuals develop curled tendrils that re-attach to adjacent substrates. Re-attachment behaviour and high growth rates result in a dense mat of drift algae, which provides a suitable micro-habitat for macro-invertebrates. The sources of algal fragments that contribute to the algal mat appear to be nearby seagrass beds and rocky substrates, where this species may settle directly from spores. Storm events may detach these algae, although pulling experiments showed that the attachment to rocky substrates is 5 times stronger than the attachment to seagrass blades. Results from the macro-faunal samples indicate that the loose-lying algal mat habitat had the highest abundance and biodiversity of organisms, followed by the seagrass bed, and then the rocky substrate habitat. The ability of loose G. maramae fragments to re-attach, along with their high growth rate, may provide a unique micro-habitat for highly abundant and diverse faunal assemblages, which in turn may sustain adjacent near-shore communities. This study highlights the ecological importance of floating algal mats to coastal ecosystems, which should be considered in future management strategies throughout the Fiji Islands.
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Petkov, Georgi D., and Svetlana G. Bratkova. "Viscosity of algal cultures and estimation of turbulency in devices for the mass culture of micro algae." Algological Studies/Archiv für Hydrobiologie, Supplement Volumes 81 (September 18, 1996): 99–104. http://dx.doi.org/10.1127/algol_stud/81/1996/99.

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Happey-Wood, Christine M. "Growth characteristics of micro-green algae." SIL Proceedings, 1922-2010 22, no. 5 (June 1985): 2855–60. http://dx.doi.org/10.1080/03680770.1983.11897789.

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Patiño, R., and U. von Stockar. "Photo-Biocalorimetry and Micro-Algae Growth." Chemie Ingenieur Technik 75, no. 8 (August 25, 2003): 1079. http://dx.doi.org/10.1002/cite.200390248.

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Chaudhary, Rimsha, Khadija Nawaz, Amna Komal Khan, Christophe Hano, Bilal Haider Abbasi, and Sumaira Anjum. "An Overview of the Algae-Mediated Biosynthesis of Nanoparticles and Their Biomedical Applications." Biomolecules 10, no. 11 (October 30, 2020): 1498. http://dx.doi.org/10.3390/biom10111498.

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Algae have long been exploited commercially and industrially as food, feed, additives, cosmetics, pharmaceuticals, and fertilizer, but now the trend is shifting towards the algae-mediated green synthesis of nanoparticles (NPs). This trend is increasing day by day, as algae are a rich source of secondary metabolites, easy to cultivate, have fast growth, and are scalable. In recent era, green synthesis of NPs has gained widespread attention as a safe, simple, sustainable, cost-effective, and eco-friendly protocol. The secondary metabolites from algae reduce, cap, and stabilize the metal precursors to form metal, metal oxide, or bimetallic NPs. The NPs synthesis could either be intracellular or extracellular depending on the location of NPs synthesis and reducing agents. Among the diverse range of algae, the most widely investigated algae for the biosynthesis of NPs documented are brown, red, blue-green, micro and macro green algae. Due to the biocompatibility, safety and unique physico-chemical properties of NPs, the algal biosynthesized NPs have also been studied for their biomedical applications, which include anti-bacterial, anti-fungal, anti-cancerous, anti-fouling, bioremediation, and biosensing activities. In this review, the rationale behind the algal-mediated biosynthesis of metallic, metallic oxide, and bimetallic NPs from various algae have been reviewed. Furthermore, an insight into the mechanism of biosynthesis of NPs from algae and their biomedical applications has been reviewed critically.
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Puri, Munish. "Algal biotechnology for pursuing omega-3 fatty acid (bioactive) production." Microbiology Australia 38, no. 2 (2017): 85. http://dx.doi.org/10.1071/ma17036.

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Algae are spread in diversified ecosystems that include marine, freshwater, desert and hot springs and even snow and ice environments. Algae are classified as multicellular large sea weeds (macroalgae) or unicellular microalgae. Macroalgae are targeted for mining of natural biologically active components, which include proteins, linear peptides, cyclic peptides, and amino acids1. Recently, microalgae have been exploited for the production of high-value compounds such as lipids (omega-3 fatty acids), enzymes, polymers, toxins, antioxidants, and pigments (carotenoids)2. Thus, algal biotechnology is defined as ‘the technology developed using algae (macro or micro) to make or modify bioactive compounds, or products (nutritional supplements, fine chemicals) and renewable fuels for specific use’.
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Mitra, Mautusi, Sara Michelle Broom, Kysis Pinto, Sovi-Mya Doan Wellons, and Ariel Dominique Roberts. "Engaging inexpensive hands-on activities using Chlamydomonas reinhardtii (a green micro-alga) beads to teach the interplay of photosynthesis and cellular respiration to K4–K16 Biology students." PeerJ 8 (August 25, 2020): e9817. http://dx.doi.org/10.7717/peerj.9817.

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Background Photosynthesis and cellular respiration play major roles in energy metabolism and are important Life Science topics for K16 Biology students. Algae beads are used for photosynthesis and cellular respiration labs. Currently there are a few companies that sell biology educational kits for making algae beads using non-motile green micro-algae to introduce students to photosynthesis. These kits are expensive and, do not come with detailed guidelines for trouble shooting and customizations for different grade levels. Chlamydomonas reinhardtii is a motile green micro-alga and is an excellent model system for photosynthesis studies. In this article, we are presenting the work conducted in the student-driven, American Society of Plant Biologists-funded, Plant-BLOOME educational outreach project. This project is a supervised collaborative effort of three undergraduates and one high school student. We have generated a protocol which can be used to make Chlamydomonas beads. We have used these beads to design two simple and inexpensive plant biology hands-on activities. These laboratory activities have been customized to teach the interplay of photosynthesis and cellular respiration to K4–K16 Biology students. Methods Chlamydomonas beads were used for two different laboratory activities that involved monitoring pH changes over time using a pH indicator. Our first activity centers on making and, using light-powered algae bead bracelets to monitor dramatic color/pH changes over time when exposed to darkness or light. Our second activity employs strain-specific algae beads with approximately equal cell numbers to conduct comparative photosynthesis and cellular respiration studies in two Chlamydomonas strains namely, wild type, 4A+ and, a high light-sensitive, photosynthetic mutant, 10E35/lsr1a. Results We optimized our experimental protocol using algae beads in a 5.5 mL screw capped glass vials before performing the same experiment in algae bead bracelets. We found that the algal cell density/bead, water type used in the experiment and, the duration of dark exposure of algal beads can affect successful implementation of the lab activities. Light-powered algae bead bracelets showed dramatic color/pH changes within 3 h upon exposure to light or darkness. These bracelets could be switched back and forth between darkness and light multiple times within 48–72 h to display color/pH changes, provided prior dark exposure time did not exceed 9 h. Our comparative studies of photosynthesis and cellular respiration in 10E35 and in 4A+ showed that relative respiration rate and photosynthetic rate is higher and lower in 10E35, respectively, compared to that in 4A+. Additionally, 10E35 failed to display the expected photosynthesis-induced pH/color changes in the light after prolonged exposure to darkness which indicated that prolonged dark exposure of 10E35, hindered photosynthesis.
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Bhattacharjee, Meenakshi. "PHARMACEUTICALLY VALUABLE BIOACTIVE COMPOUNDS OF ALGAE." Asian Journal of Pharmaceutical and Clinical Research 9, no. 6 (November 1, 2016): 43. http://dx.doi.org/10.22159/ajpcr.2016.v9i6.14507.

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ABSTRACT Pharmaceutically valuable products from micro algae and its industrial commercialization today is still in its infancy and can be seen as a gateway to a multibillion dollar industry. Microalgae generally grow autotrophically and are ubiquitous in nature.They represent a major untapped resource of genetic potential for valuable bioactive agents and fine biochemical. This proven ability of microalgae to produce these compounds places these microorganisms in the biotechnological spotlight for applications and commercialization as in the Pharmaceutical industry. The production of microalgal metabolites, which stimulate defense mechanisms in the human body, has spurred intense study of the application of micro algal biomass and products thereof in various food preparations, pharmacological and medical products. There is therefore a huge scope for further study of the identified algal compounds and their activities in the treatment and prevention of various diseases, in addition to an ongoing search for other, as yet undetected, metabolites. Key words:Algae,Pharmaceuticals, Bioactive compounds.
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Isya, Anisa Azzahra, Kezia Rhesa Arman, and Joko Wintoko. "Mini-Review Teknologi Carbon Capture and Utilization (CCU) Berbasis Kombinasi Proses Kimia dan Bioproses." Equilibrium Journal of Chemical Engineering 4, no. 2 (February 18, 2021): 71. http://dx.doi.org/10.20961/equilibrium.v4i2.47908.

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<p class="p1"><strong>Abstrak.</strong> Saat ini kebutuhan energi masih mengandalkan bahan bakar fosil. Di sisi lain, emisi CO<sub>2<span class="Apple-converted-space"> </span></sub>yang dihasilkan dari pembakaran bahan bakar fosil terus meningkat dan berkontribusi sebagai gas rumah kaca di atmosfer. Pemanasan global menjadi ancaman bagi masa depan kehidupan. Salah satu upaya penanggulangannya adalah dengan mengembangkan teknologi <em>Carbon, Capture, and Utilization</em> (CCU) berbasis proses absorpsi kimia untuk menangkap gas CO<sub>2<span class="Apple-converted-space"> </span></sub> dari hasil pembakaran. CO<sub>2</sub> yang ditangkap kemudian disimpan dalam bentuk yang stabil sehingga tidak akan terlepas ke atmosfer atau dimanfatkan sebagai bahan baku industri kimia. Kendala utama penerapan teknologi CCU dalam skala besar adalah besarnya biaya yang diperlukan. Sementara, <em>revenue</em> yang dihasilkan relatif rendah. Pada teknologi CCU berbasis proses absorpsi kimia ini, bahan kimia sebagai absorbennya perlu diregenerasi lagi dan CO<sub>2</sub>-nya dipisahkan untuk disimpan atau dimanfaatkan. Namun regenerasi ini memerlukan biaya yang relatif mahal. Beberapa penelitian mencoba melakukan regenerasi ini dengan bioproses berbasis mikro-alga. Mikro-alga dapat mengambil energi dari cahaya matahari yang melimpah di daerah tropis seperti Indonesia. Di samping itu, beberapa jenis mikro alga mempunyai potensi untuk dimanfaatkan sebagai bahan pangan dan lainnnya. Dalam <em>review</em> ini akan dibahas hasil-hasil penelitian terkini tentang bahan kimia yang sesuai untuk proses absorpsi CO<sub>2</sub> dari gas buang, metode regenerasinya mempergunakan mikro-alga, spesies mikro-alga yang dapat dipakai, dan potensi pemanfaatan mikro-alganya.</p><p> </p><p><strong>Abstract.</strong> Currently, energy needs still rely on fossil fuels. On the other hand, CO<sub>2</sub> emissions resulting from burning fossil fuels continue to increase and contribute as a greenhouse gas in the atmosphere. Global warming is a threat to the future of life. One of the countermeasures is by developing Carbon, Capture, and Utilization (CCU) technology based on a chemical absorption process to capture CO<sub>2</sub> gas from combustion. The captured CO<sub>2</sub> is then stored in a stable form so it will not be released into the atmosphere or used as raw material for the chemical industry. The main obstacle to implementing CCU technology on a large scale is the cost involved. Meanwhile, the revenue generated is relatively low. In CCU technology based on this chemical absorption process, chemicals as absorbents need to be regenerated and the CO<sub>2</sub> is separated for storage or use. However, this regeneration requires a relatively high cost. Several studies have attempted to perform this regeneration with micro-algae-based bioprocesses. Micro-algae can take energy from sunlight which is abundant in tropical areas such as Indonesia. In addition, several types of micro algae have the potential to be used as food and other utilizations. This review will discuss the results of recent research on suitable chemicals for the absorption of CO<sub>2</sub> from flue gas, its regeneration method using micro-algae, usable micro-algae species, and the potential for micro-algae utilization.</p>
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Dissertations / Theses on the topic "Micro algae"

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com, n_moheimani@hotmail, and Navid Reza Moheimani. "The culture of coccolithophorid algae for carbon dioxide bioremediationn." Murdoch University, 2005. http://wwwlib.murdoch.edu.au/adt/browse/view/adt-MU20050901.140745.

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The culture of coccolithophorid algae is an attractive option for sequestration or recycling of CO2 as they can fix carbon by photosynthesis as well as in calcium carbonate scales known as coccoliths. They also produce high amounts of lipids which have a potential application as a renewable fuel. Five species of coccolithophorids (Pleurochrysis carterae, CCMP647, Pleurochrysis sp. CCMP1211, Gephyrocapsa oceanica CS-335/2, Emiliania huxleyi CCMP371, and Emiliania huxleyi CS-369) were screened for their ability to grow at high temperature. All species grew up to 28oC except E. huxleyi CS-369. However, Pleurochrysis sp. CCMP 1211 which was found to clump and can therefore not be recommended for large-scale cultivation. The salinity tolerance of these species was also examined. Growth of P. carterae, G. oceanica, and E. huxleyi in laboratory scale closed photobioreactors (plate, carboy, airlift, and tubular photobioreactors) showed the plate photobioreactor to be the best closed cultivation system. The highest productivities were achieved by P. carterae in the plate photobioreactor and were 0.54 g.L-1.d-1, 0.12 g.L-1.d-1, 0.06 g.L-1.d-1 for total dry weight, lipid and CaCO3 respectively. The growth of P. carterae and E. huxleyi was also examined in an outdoor raceway pond. The E. huxleyi culture was easily contaminated resulting in the loss of the culture in less than three weeks, but P. carterae grew well over a period of 13 months. The overall total dry weight productivity of P. carterae was 0.19 g.L-1.d-1 with lipid and CaCO3 contents of up to 33% and 10% of dry weight respectively. There was little protozoan and bacterial contamination. Medium pH increased to pH 11 during the day and was found to be a reliable variable for maintaining the health of the culture. A maximum pH achieved during the day of less than pH 8.5 indicated the imminent collapse of the culture. Heavy rain and low temperature were the main reasons for culture loss in mid winter, whereas high temperature during summer favoured P. carterae growth. A comparison of the growth of P. carterae and Dunaliella salina MUR8 in the raceway ponds showed no significant differences between these two species with regard to areal total dry weight productivity and lipid content. The effects of several limiting factors were also examined. A reduction in medium pH resulting from CO2 addition inhibited the growth of E. huxleyi in the plate photobioreactor, whereas P. carterae growth and productivities increased in the pH range of pH 7.7 to 8.0 in the plate photobioreactor and pH 9.1 to 9.6 in the outdoor raceway pond. The best operational pond depth for outdoor raceway culture of P. carterae was between 16 cm and 21 cm. Early morning temperatures, especially during the winter, highly affected the growth of P. carterae in the raceway pond, whereas artificially increasing the medium temperature improved the health of the culture but resulted in little increase in productivity. Photosynthesis of P. carterae was found to be highly inhibited by high oxygen concentration in the medium irrespective of temperature or irradiance. An economic model of P. carterae in a 63 ha raceway plant resulted in a cost for the biomass of between 7.35 Aus$.Kg-1 and 14.17 Aus$.Kg-1 depending on the harvesting method used.
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Vahora, Nisha. "Micro-scale interactions between chemotactic bacteria and algae." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/60787.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2010.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 47-51).
Traditional views of marine environments describe the ocean pelagic zone as a homogeneous nutrient-poor environment. Heterotrophic marine bacteria that have evolved high-energy mechanisms for swimming abilities and sensing nutrient gradients would gain no survival advantage under this model. Recent identification of microscale (<1cm) nutrient patches, such as those produced by algal exudates, explain a potential for these evolved functions. With this new model for the pelagic zone, bacteria, through chemotaxis and motility, can sense and respond to microscale carbon patches exuded from growing algae. This study examines possible conditions necessary under which it is advantageous to swim. As an initial step to test this hypothesis, we developed a system to investigate bacterial chemotaxis to algal exudates. Two algae from the genus, Thalassiosira, which differed in size, were grown in artificial seawater and filtered, with the use of a novel instrument, to generate nutrient heterogeneity at the microscale. Pseudoalteromonas haloplanktis was added to algal cultures with varying algae:bacteria ratios of 1:250 to 1:50,000 and bacterial chemotaxis was observed by localization around individual algae. P. haloplanktis exhibited chemotaxis towards the larger algae Thalassiosira rotula within seconds but not Thalassiosira weissflogii suggesting larger algae elicit a chemotactic response. Results provide evidence of real time clustering in response to the presence of live algae and suggest a mechanism that provides a fitness advantage over non-motile bacteria.
by Nisha Vahora.
M.Eng.
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Thompson, Haydn Frank. "Investigating relationships between hydrocarbonoclastic bacteria and micro-algae." Thesis, Heriot-Watt University, 2017. http://hdl.handle.net/10399/3347.

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Crude oil spills damage marine ecosystems due to the potentially toxic nature of the petrochemical hydrocarbon constituents and their recalcitrance to degradation. Polycyclic aromatic hydrocarbon components (PAHs) are one group of hydrocarbons in crude oil that are of particular concern due to their genotoxicity and potential to bioaccumulate. Their potential to cause damage in marine environments can be mitigated by the presence and activities of hydrocarbonoclastic bacteria. The phycosphere of marine eukaryotic phytoplankton (micro-algae) has recently been shown as an important biotope where hydrocarbonoclastic bacteria can be found, and the association between these organisms is largely unexplored. This thesis presents new insight into the relationship between these organisms by performing enrichment experiments with crude oil and individual hydrocarbon substrates, as well as wholegenome analysis of an algal-associated hydrocarbon-degrader, and using molecular probes for the in situ visualization (by CARD-FISH) and whole-community analysis (by Flow-FISH) of hydrocarbonoclastic bacteria associated with laboratory cultures and field samples of micro-algae. Results demonstrated variations in the tolerance of different diatom species to PAHs, and that intermediate metabolites formed from the partial biodegradation of PAHs can be more harmful to diatoms compared to that of their parent PAH compounds. Thalassiosira pseudonana presence enhanced phenanthrene dissolution and PAH-degrading bacteria formed cell clusters in EPS aggregates. The genome of an obligate hydrocarbonoclastic bacterial species (Polycyclovorans algicola) found associated with marine micro-algae possessed genes involved in cell communication, horizontal gene transfer and nutrient sharing that may play an important role in the organism’s association with its eukaryotic host cells. Indeed, these interactions are likely to allow these hydrocarbonoclastic bacteria to be supported on the phycosphere of micro-algae in the absence of petrochemical exposure. Microcosm experiments with field samples of micro-algae and bacterial consortia showed that crude oil biodegradation, in particular the PAH fraction, was enhanced compared to that by the free-living bacterial community, and revealed certain groups (e.g. members of the order BD7-3) that had not previously been reported to become enriched in the presence of crude oil. Using Flow-FISH, epibiotic members of the genus Marinobacter were found associated with micro-algae in sea surface field samples, and CARD-FISH was used to show this same group associated with the soft tissues of the coral Lophelia pertusa from polyp samples collected from different coral mounds in the deep North Atlantic.
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Abadie, Eric. "Etude de Vulcanodinium rugosum (Dinoflagellé producteur de pinnatoxines) se développant dans la lagune méditerranéennede l’Ingril." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS188/document.

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Les efflorescences phytoplanctoniques nuisibles et/ou toxiques impactent depuis très longtemps les écosystèmes marins du monde entier. Ces développements massifs ont un effet néfaste sur les écosystèmes et leur exploitation. Les lagunes du Languedoc-Roussillon sont touchées depuis plusieurs décennies. En plus des risques sanitaires récurrents dus aux genres Dinophysis (toxines DSP) et Alexandrium (toxines PSP), Vulcanodinium rugosum a été identifiée en 2011 dans la lagune d’Ingril. Cette nouvelle espèce est productrice de pinnatoxines (neurotoxines). A travers ces travaux de thèse, la biologie de cette nouvelle espèce (cycle de vie, condition de croissance, production de toxines), ses capacités de contamination des mollusques et sa distribution géographique dans les lagunes limitrophes ont été étudiées sur des cultures au laboratoire et via des suivis environnementaux.Les résultats de cette étude ont mis en évidence le caractère thermophile et euryhalin de cette microalgue (croissance optimale à 25°C et à une salinité de 40 ) avec des plages de croissance comprises entre 20 et 30°C. Sa capacité à croître sur une source azotée organique (urée) a été observée in vitro. Son expansion à des lagunes du Languedoc-Roussillon autre que l’étang d’Ingril, a été confirmée par la mise en évidence de la contamination des moules par la pinnatoxine G. La survie de ce dinoflagellé dans le tractus digestif des moules et des huîtres prouve que le transfert de coquillages est une source de contamination potentielle des écosystèmes non impactés par cette espèce toxique.Le cycle de vie de V. rugosum n’a pu être élucidé que partiellement, le kyste de résistance n’ayant pas été identifié formellement. Les kystes temporaires apparaissent comme des stades très importants à prendre en considération en raison de leur capacité à se diviser et de leur forte présence sur les macrophytes. Ces formes temporaires de résistance peuvent constituer une source de contamination non négligeable des mollusques dans la lagune de l’Ingril même lorsque les cellules végétatives de V. rugosum sont peu présentes dans la colonne d’eau. En raison des faibles densités de V. rugosum in situ et la difficulté de son identification sur des critères morphologique, sa surveillance dans le cadre du REPHY demeure difficile. Ainsi l’utilisation de systèmes d’échantillonnage passifs (SPATT) constitués de résines qui adsorbent les toxines dissoutes dans l’eau permettrait la détection précoce des toxines associées à ces espèces benthiques émergentes. Cette étude met en évidence la prolifération d’une espèce émergente thermophile qui pourrait avec d’autres et à la faveur de changements climatiques constituer des problèmes sanitaires et économiques importants dans les écosystèmes lagunaires vulnérables de la Méditerranée
Harmful and / or toxic phytoplankton blooms impact for a long time marine ecosystems worldwide. These massive developments have an adverse effect on ecosystems and their exploitation. The lagoons of the region Languedoc-Roussillon are affected for decades. In addition to recurring health risks from Dinophysis (DSP toxins) and Alexandrium (PSP toxins), Vulcanodinium rugosum was identified in 2011 in the lagoon Ingril. This new species product pinnatoxins (neurotoxins). Through this thesis work, the biology of this new species (life cycle, growth condition, toxin production), its shellfish contamination capacity and geographic distribution in neighboring lagoons were studied on cultures in the laboratory and via environmental monitoring.The results of this study have demonstrated its thermophilic and euryhaline features (optimum salinity and temperature of 25°C and 40 respectively) and its growth ranges between 20 and 30°C. Its ability to grow on an organic nitrogen source (urea) has been showed in vitro. Its expansion in other lagoons of Languedoc-Roussillon, was confirmed by the contamination of the mussels by the pinnatoxin G. The survival of this organism in the digestive tract of mussels and oysters proves that the transfer of shellfish is potentially a source of contamination of new ecosystems not yet affected by this toxic species.The life cycle of V. rugosum has not been fully described because the resistance cyst has not been formally identified. Temporary cysts appear as very important stages to be considered because of their ability to divide and their strong presence on macrophytes. These temporary forms of resistance may be a significant source of contamination of shellfish in the lagoon of the Ingril even when the vegetative cells of V. rugosum are weakly present in the water column. Because of the low densities of V. rugosum in situ and the difficulty of its identification on morphological criteria, the monitoring within the REPHY protocol remains difficult. Thus the use of passive sampling systems (Spatt) made with resins which adsorb toxins dissolved in water would make possible the early detection of toxins associated with these emerging benthic species. This study highlights the growth of an emerging thermophilic species that might with others and thanks to climate change provide important health and economic problems in vulnerable lagoon ecosystems of the Mediterranean
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Chochois, Vincent. "Implication des réserves carbonées dans le photoproduction d'hydrogène chez l'algue verte Chlamydomonas reinhardtii." Aix-Marseille 2, 2009. http://theses.univ-amu.fr.lama.univ-amu.fr/2009AIX22074.pdf.

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L’algue verte unicellulaire Chlamydomonas reinhardtii, est capable de produire de l’hydrogène en utilisant l’eau comme donneur d’électrons et la lumière solaire comme source d’énergie. Bien que cette propriété offre des perspectives biotechnologiques intéressantes, une limitation majeure est liée à la sensibilité de l’hydrogénase à l’oxygène, sous‐ produit de l’activité photosynthétique. Il avait été précédemment montré qu’en condition de carence en soufre, C. Reinhardtii peut produire de l’hydrogène pendant plusieurs jours (Melis et al. 2000). Au cours de ce processus, deux voies de production, l’ une directe impliquant le photosystème II (PSII) et l’autre indirecte impliquant le seul PSI cohabitent, les réserves d’amidon étant supposées jouer un rôle dans le fonctionnement de chacune de ces voies. L’objectif de ce travail de thèse visait à élucider les mécanismes reliant le catabolisme de l’amidon au processus de photo‐production d’hydrogène. Dans un premier temps, l’analyse de mutants affectés dans la biosynthèse de l’amidon (sta6 et sta7) a permis de montrer que, si les réserves d’amidon étaient essentielles au fonctionnement de la voie indirecte, elles ne participaient pas à la voie directe. Dans un second temps, dans le but d’identifier les étapes métaboliques et les régulations impliquées dans le catabolisme de l’amidon, nous avons développé une approche génétique basée sur la recherche de mutants affectés dans la mobilisation des réserves. Huit mutants (std1 à std8) affectés à des degrés divers dans leurs capacités à dégrader l’amidon suite à une phase d’accumulation préalable ont été isolés à partir d’une banque de 15 000 mutants d’insertion. Un des ces mutants, std1 est affecté dans une kinase apparentée à la famille des DYRK (dualspecificity tyrosine regulated serine threonine kinase). Bien que les cibles de cette enzyme restent à déterminer, l’analyse du protéome lié aux grains d’amidon indique de profondes modifications dans l’expression de phosphorylases potentiellement impliquées dans la dégradation de l’amidon. STD1 représente le premier élément régulateur du catabolisme de l’amidon identifié à ce jour chez les végétaux
The unicellular green alga Chlamydomonas reinhardtii is able to produce hydrogen, using water as an electron donor, and sunlight as an energy source. Although this property offers interesting biotechnological perspectives, a major limitation is related to the sensitivity of hydrogenase to oxygen which is produced by photosynthesis. It had been previously shown that in conditions of sulfur deprivation, C. Reinhardtii is able to produce hydrogen during several days (Melis et an. 2000). During this process, two pathways, one direct depending on photosystem II (PSII) activity and the other involving only the PSI, are involved, starch reserves being supposed to play a role in both of these pathways. The purpose of this phD thesis was to elucidate the mechanisms linking starch catabolism to the hydrogen photoproduction process. Firstly, the analysis of mutants affected in starch biosynthesis (sta6 and sta7) showed that if starch reserves are essential to the functioning of the indirect pathway, they are not involved in the direct one. Secondly, in order to identify metabolic steps and regulatory processes involved in starch breakdown, we developed a genetic approach based on the search of mutants affected in starch reserves mobilization. Eight mutant (std1 to std8) diversely affected in their ability to degrade starch after an accumulation phase have been isolated from an insertional mutant library of 15,000 clones. One of these mutants, std1, is affected in a kinase related to the DYRK family (dual‐specificity tyrosine regulated serine threonine kinase). Although the targets of this putative kinase remain to be identified, the analysis of the granulebound proteome displayed profound alterations in the expression profile of starch phosphorylases, potentially involved in starch breakdown. STD1 represents the first starch catabolism regulator identified to date in plants
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Monari, Chiara. "Life cycle assessment of biodiesel production from micro-algae: a case study in Denmark." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/6106/.

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Le sperimentazioni riguardanti la produzione di biodiesel da alghe sono state condotte solo in laboratorio o in impianti pilota e il processo produttivo non è ancora stato sviluppato su scala industriale. L’obiettivo di questo lavoro di tesi è stato quello di valutare la potenziale sostenibilità ambientale ed energetica della produzione industriale di biodiesel da microalghe nella realtà danese ipotizzando la coltivazione in fotobioreattori. La tesi ha analizzato le diverse tecnologie attualmente in sperimentazione cercando di metterne in evidenza punti di forza e punti di debolezza. La metodologia applicata in questa tesi per valutare la sostenibilità ambientale ed energetica dei processi analizzati è LCA strumento che permette di effettuare la valutazione sull’intero ciclo di vita di un prodotto o di un processo. L’unità funzionale scelta è 1 MJ di biodiesel. I confini del sistema analizzato comprendono: coltivazione, raccolta, essicazione, estrazione dell’olio, transesterificazione, digestione anaerobica della biomassa residuale e uso del glicerolo ottenuto come sottoprodotto della transesterificazione. Diverse categorie d’impatto sono state analizzate. In questo caso studio, sono stati ipotizzati 24 diversi scenari differenziati in base alle modalità di coltivazione, di raccolta della biomassa, di estrazione dell’olio algale. 1. la produzione di biodiesel da microalghe coltivate in fotobioreattori non appare ancora conveniente né dal punto di vista energetico né da quello ambientale. 2. l’uso di CO2 di scarto e di acque reflue per la coltivazione, fra l’altro non ancora tecnicamente realizzabili, migliorerebbero le prestazioni energetiche ed ambientali del biodiesel da microalghe 3. la valorizzazione di prodotti secondari svolge un ruolo importante nel processo e nel suo sviluppo su larga scala Si conclude ricordando che il progetto di tesi è stato svolto in collaborazione con la Danish Technical University of Denmark (DTU) svolgendo presso tale università un periodo di tirocinio per tesi di sei mesi
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Smith-Baedorf, Holly D. "Microalgae for the biochemical conversion of CO2 and production of biodiesel." Thesis, University of Bath, 2012. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.564010.

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As the global population rises to an estimated 9.4bn by 2050, the pressure for food, fuel and freshwater will continue to increase. Current renewable energy technologies are not widely applicable to the transport sector, which requires energy dense liquid fuels that drop into our existing infrastructure. Algal biofuels promise significantly higher yields than plants, without the displacement of valuable agricultural resources and have the potential to meet the global demand for transport fuel. Fossil fuel energy is largely ‘a legacy of algal photosynthesis’, with algae accounting for ~50% of global CO2 fixation today. In addition, these curious organisms show remarkable diversity in form, behaviour and composition. Recently there has been a global resurgence of interest in microalgae as a resource of biomass and novel products. With the present level of technology, knowledge and experience in commercial scale aquaculture, the capital cost and energy investment for algal biomass production is high. Culturing, harvesting and disrupting microalgal cells account for the largest energy inputs with more positive energy balances requiring low energy designs for culture, dewatering and extraction, efficient water and nutrient recycling with minimal waste. Little is known about the variable cell wall of microalgae, which presents a formidable barrier to the extraction of microalgal products. Staining, transmission electron microscopy (TEM) and enzymatic digestion were all utilised in an attempt to visualise, digest and characterise the cell wall of stock strains of Chlorella spp. and Pseudochoricystis ellipsoidea. The presence of algaenan, a highly resistant biopolymer, rendered staining and enzymatic digestion techniques ineffective. TEM revealed that algaenan is present in the outer walls of microalgae in a variety of conformations which appeared to impart strength to cells. A preliminary investigation utilising Fusarium oxysporum f.sp. elaeidis as a novel source of enzymes for the digestion of algaenan has also been described. Methods were developed for the mutagenesis of Chlorella emersonii and P. ellipsoidea using EMS and UV with the intent of generating cell-wall mutants. Although no viable cell wall mutants were produced, a viable pale mutant of C. emersonii was recovered 5 from UV mutagenesis. Growth rates of the pale mutant were significantly slower than the wild type, yet FAME profile was largely unaffected. Fluorescence activated cell sorting (FACS) was also investigated as a means for the rapid screening of mutagenized cells for cell wall mutants. In an attempt to reduce cooling costs of closed-culture systems, temperature tolerant species of microalgae were sought by bioprospecting the thermal waters of the Roman Baths. Numerous methods for isolation and purification of microalgae from the Baths were employed, ultimately yielding seven diverse isolates including cyanobacterial, eukaryotic, filamentous and single celled species. Despite some species possessing an increased tolerance to higher temperatures, none showed marked temperature tolerance coupled with high productivity. Further improvements to the culture conditions may have improved the productivity at higher temperatures. All seven isolates were deposited to the Culture Collection of Algae and Protozoa (CCAP). A variety of extraction methods including soxhlet, beadbeating, sonication and microwaving was investigated for efficacy of extracting fatty acid methyl esters (FAMEs) from C. emersonii. Beadbeating proved most effective in the extraction of FAMEs from C. emersonii. Microwaving showed potential as a rapid method of extraction yet was coupled with degradation of FAMEs, requiring further method development to resolve this issue. Method development has been a significant component of the work described in this thesis.
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Gola, Nontutuzelo Pearl. "The value of locally isolated freshwater micro-algae in toxicity testing for water resource management in South Africa." Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1017873.

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The ecological position of micro-algae at the base of the aquatic food web makes them critical components of aquatic ecosystems. Their short generation time also makes them useful biological indicators because they respond quickly to changes in environmental condition, enabling timely identification and assessment of water quality changes. The inclusion of micro-algae as indicators in water resource regulation and management in South Africa has started recently, their more extensive use in biomonitoring and ecotoxicology programmes for water resource management would contribute to the South African policy if water resource protection. The standard algal growth inhibition assay with the species Pseudokirchneriella subcapitata is currently used for monitoring toxicity of in-stream and industrial wastewater discharges to freshwater micro-algae. The relevance of the data generated by standard toxicity bioassays has been questioned, since micro-algae in particular are extremely variable in their sensitivity to a range of contaminants and these standard species used may not occur in the local aquatic environment. As a result, international regulatory agencies, have recommended algal growth inhibition tests be changed from a single standard species to tests with a number of species. One recommendation, in addition to the use of standard toxicity tests, is the use of species isolated from the local environment which may be more relevant for assessing site specific impacts. This study investigated the value and application of locally isolated South African freshwater micro-algae in toxicity tests for water resource management and was carried out in three phases. The first phase involved isolating micro-algae from South African aquatic resources. Micro-algae suitable for toxicity testing were identified and selected using as set of criteria. Three (Scenedesmus bicaudatus, Chlorella sorokiniana and Chlorella vulgaris) out of eight successfully isolated species satisfied the prescribed selection criteria and these were selected as potential toxicity test species. The second phase focused on refining and adapting the existing algal toxicity test protocol (the algal growth inhibition assay) for use on the locally isolated algal species. The refinement of the test protocol was achieved by exposing the locally isolated species to reference toxicants in order to assess and compare their growth and sensitivity to the toxicants under the prescribed toxicity test conditions with that of the standard toxicity test species (Pseudokirchneriella subcapitata) and a commercial laboratory species (Chlorella protothecoides). During this phase, one of the three local species (Scenedesmus bicaudatus) was eliminated as a potential toxicity test species due to inconsistent growth. The third phase of the study involved assessing the sensitivity of the two remaining species (C. vulgaris and C. sorokiniana) to a range of toxicants (reference toxicants, salts, effluents and a herbicide) and comparing it to that of the standard toxicity test species P. subcapitata and C. protothecoides. The toxicants were selected based on their relative importance in the South African context, as well as the practicality of using these local micro-algae to routinely determine the impact of these toxicants on local aquatic resources. The growth of the four micro-algae was stimulated by the selected effluents. The standard toxicity test species P. subcapitata was ranked the most sensitive and of the four species to two reference toxicants and two inorganic salts. Chlorella sorokiniana was ranked the most sensitive of the three Chlorella species to two reference toxicants and two inorganic salts. The herbicide stimulated the growth of C. vulgaris while inhibiting the growth of the other species. Pseudokirchneriela subcapitata and C. sorokiniana showed high intra-specific variability in growth, which made it difficult to determine the effective concentrations of the herbicide and therefore compare the sensitivity of the species. This varied response of micro-algal species to toxicants may result in the biodiversity shifts in aquatic ecosystems, and also supports the recommendation of using a battery of different species to support more informed decisions in water resource management.
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Liu, Yang. "Greenalgae as a substrate for biogas production - cultivation and biogas potentials." Thesis, Linköping University, Linköping University, Department of Water and Environmental Studies, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-57987.

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Algae is regarded as a good potential substrate for biogas production, due to high cells productivity, low cellulose and zero lignin content. Two parts were included in this study: first, cultivations of micro-algae (Chlorella sorokiniana and Tetraselmis suecica) at two different nitrate concentrations, also the effect of addition of CO2 on algae grow was investigated in this first part. Second, batch fermentations of the cultivated micro-algae as well as a powder Chlorella (obtained from Raw Food Shop) and a dry mix filamentous algae (collected in the pounds in the park at the back of the Tema-building and then dried) were performed. In this part also effects of thermo-lime pretreatment (room temperature, 80oC, 105oC and 120oC) on the algae biogas potentials was investigated.

 

Both strains of micro-algae cultured at low nitrate gave more CH4 yield: 319 (±26) mL and 258 (±12) mL CH4 per added gVS was obtained during the degradation of Chlorella sorokiniana grown at 0.4mM-N and 2mM-N level, respectively. For Tetraselmis suecica 337 (±37) mL and 236 (±20) mL CH4 per added gVS was obtained at 2.4mM-N and 12mM-N level, respectively. Powder Chlorella gave the highest biogas production (719 ±53 mL/added gVS) and CH4 yields (392 ±14 mL/added gVS), followed by the dry filamentous algae (661 ±20 mL biogas and 295 ±9 mL CH4 per added gVS) and Tetraselmis suecica (12 mM-N; 584 ±7 mL biogas and 295 ±9 mL CH4 per added gVS).

 

A negative effect of lime treatment at room temperature on CH4 yield of algal biomass was obtained. Lime treatment at 120oC showed the fastest degradation rate for Tetraselmis suecica and powder Chlorella during the initial 5 days of incubation.  

 

Chlorella sorokiniana and Tetraselmis suecica cultures flushed with biogas containing 70% and also CO2 enriched air (5% CO2) did not increase cells growth (measured as OD600) if compared to references grown under air. On the contrary, a clearly inhibition effect on the algal cells growth was observed in some cultures.

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Clément, Romain. "Adaptation des diatomées à différentes concentrations de CO2." Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4748.

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Les objectifs de ce travail étaient d’approfondir les connaissances sur les capacités d’adaptation des diatomées à différentes concentrations de CO2 et plus précisément sur l’implication des CCM dans l’assimilation du carbone minéral dissous. Des études sur la physiologie, les enzymes de différentes voies métaboliques et des analyses de transcriptomique et de protéomique ont été réalisées. Nous avons observé que les espèces de diatomées étudiées étaient capables de réguler leurs systèmes de concentration du carbone minéral suivant les conditions environnementales. Certaines semblent utiliser préférentiellement le CO2 ou le bicarbonate tandis que d’autres espèces utilisent les deux. L’activité des anhydrases carbonique est fortement induite en faible concentration de CO2. Nos travaux montrent cependant, que l’activité de cette enzyme est variable d’une espèce à l’autre. Nous avons aussi observé que dans la majorité des diatomées que nous avons étudiées, la photosynthèse de type C3 et non de type C4 est présente, apportant ainsi un éclairage à une véritable controverse sur le métabolisme du carbone chez les diatomées. Nos travaux soulignent de plus, une grande diversité de stratégies de CCM chez les diatomées. Chez T. pseudonana, une nouvelle protéine, LCIP63, a été observée en conditions de faible concentration de CO2. Son rôle physiologique est actuellement inconnu ouvrant de nouvelles perspectives de recherche
The objectives of this work were to improve the knowledge on ability of diatoms to scope with different CO2 concentrations and to study their carbon concentrating mechanisms (CCM). Studies of their physiology, their metabolic enzymes, and analyses at transcriptomic and proteomic levels were performed. In all studied diatoms, the CCMs can be regulated according to CO2 availability in the environment. Some diatoms seem to use preferentially CO2, others, bicarbonate and some can use both. The carbonic anhydrase (CA) activity is strongly induced when cells were grown at low vs high CO2. However, our work shows that CA activity is highly variable among the different diatoms. Most of the studied diatoms perform a C3 photosynthesis and not C4 photosynthesis. In diatoms, there is a huge diversity in the CCM strategy. A new protein, LCIP63, was observed when T. pseudonana was grown under low CO2. The physiological role of this protein is yet unknown and this finding opens new research perspectives
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Books on the topic "Micro algae"

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A, Borowitzka Michael, and Borowitzka Lesley J, eds. Micro-algal biotechnology. Cambridge [Cambridgeshire]: Cambridge University Press, 1988.

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Micro-Algal Production for Biomass and High-Value Products. Taylor & Francis Group, 2016.

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Book chapters on the topic "Micro algae"

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Griffiths, Melinda, Susan T. L. Harrison, Monique Smit, and Dheepak Maharajh. "Major Commercial Products from Micro- and Macroalgae." In Algae Biotechnology, 269–300. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-12334-9_14.

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Alagarsamy, Arun, Kulanthaiyesu Arunkumar, Isabel S. Carvalho, Natrajan Mangaiyarkarasi, K. Nayana, and Rathinam Raja. "Micro- and Macroalgae: An Updated View." In Algae for Food, 1–8. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003165941-1.

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Ravikumar, Ramanujam. "Micro Algae in Open Raceways." In Algal Biorefineries, 127–46. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7494-0_5.

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Jadhav, Swapnaja K., Anil K. Dubey, Mayuri Gupta, Sachin Gajendra, and Panna Lal Singh. "Micro Algae Production for Bio Fuel Generation." In Bioenergy Engineering, 153–72. London: CRC Press, 2021. http://dx.doi.org/10.1201/9781003230878-8.

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Gutierrez, Tony. "Cultivating Aerobic Hydrocarbon-Degrading Bacteria from Micro-algae." In Springer Protocols Handbooks, 95–106. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/8623_2014_1.

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Kasimani, R., R. Seenivasagan, and K. Sundar. "Optimization of Growth Medium and Biosorption of Chromium Using Micro Algae and Cyanobacteria." In Bioremediation and Sustainable Technologies for Cleaner Environment, 347–58. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-48439-6_26.

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Lukešová, Alena, and Jan Frouz. "Soil and Freshwater Micro-Algae as a Food Source for Invertebrates in Extreme Environments." In Cellular Origin, Life in Extreme Habitats and Astrobiology, 265–84. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-6112-7_14.

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Palmisano, A. C., and C. W. Sullivan. "Physiological Response of Micro-Algae in the Ice-Platelet Layer to Low-Light Conditions." In Antarctic Nutrient Cycles and Food Webs, 84–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82275-9_12.

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Sen, Nomita. "Comparison of Growth of Micro-Algae Nostoc Linckia & Chlorella sp. in Dilute Culture." In Current Research in Photosynthesis, 3721–24. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0511-5_840.

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Chankova, Stefka G., and Nadezhda Yurina. "Micro-algae as a Model System for Studying of Genotype Resistance to Oxidative Stress and Adaptive Response." In Radiobiology and Environmental Security, 19–30. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1939-2_3.

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Conference papers on the topic "Micro algae"

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Dewasme, Laurent, Christian G. Feudjio Letchindjio, Ixbalank Torres Zuniga, and Alain Vande Wouwer. "Micro-algae productivity optimization using extremum-seeking control." In 2017 25th Mediterranean Conference on Control and Automation (MED). IEEE, 2017. http://dx.doi.org/10.1109/med.2017.7984195.

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Notake, Takashi, Tomokazu Iyoda, Kaori Kamata, Chiko Otani, and Hiroaki Minamide. "Micro Helical Antenna Made From Biological Algae Spirulina." In 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz). IEEE, 2019. http://dx.doi.org/10.1109/irmmw-thz.2019.8874355.

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Avila, Adrian, Antonio Bula, Rafael Go´mez, Jorge Mendoza, and Arnaldo Verdeza. "Thermodynamic Characterization and Dynamic Simulation of a Micro Algae Air Lift Photobioreactor." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54662.

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Micro algae production as a source of fatty biomass that can be used to produce biofuels is a promising alternative that needs to be thoroughly evaluated. The tendency to increase production and energy content and to reduce water usage has had an impact in the development of photobioreactors, due to the versatility of this equipment to control and optimize the production parameters. This system requires an adequate scheme for monitoring and controlling the variables such as temperature, light intensity, carbon dioxide and oxygen supply, in order to guarantee the micro algae growth. This paper presents a control strategy for algae growth in an airlift photobioreactor. A thermodynamic characterization was performed and the dynamic behavior of the system is modeled for system analysis and control. A mathematical model is developed using the equations describing the process. A PID controller is set to evaluate the parameters that control algae growth. The results show that the photobioreactor presents a substantial sensitivity to room temperature changes, and this is considered as the main disturbance of the process. For the dynamic characterization a non-linear differential equations-based model was developed, and after tuning a PID controller it was found that the system was robust to changes in ambient conditions.
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Ariawan, Eko, and A. Stanley Makalew. "Smart Micro Farm: Sustainable Algae Spirulina Growth Monitoring System." In 2018 10th International Conference on Information Technology and Electrical Engineering (ICITEE). IEEE, 2018. http://dx.doi.org/10.1109/iciteed.2018.8534904.

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Konishi, Y., K. Ohno, N. Saitoh, T. Nomura, and S. Nagamine. "Microbial synthesis of noble metal nanoparticles using the Fe(III)-reducing bacterium shewanella algae." In 2006 Bio Micro and Nanosystems Conference. IEEE, 2006. http://dx.doi.org/10.1109/bmn.2006.330876.

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Millis, Justin, Laurie Connell, Scott D. Collins, and Rosemary L. Smith. "A microfabricated, flow driven mill for the mechanical lysis of algae." In 2015 28th IEEE International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2015. http://dx.doi.org/10.1109/memsys.2015.7050918.

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Habib, Muddasar, Intisab ul Haq, Pakeeza Mustafa, Hira Rehman, Rovaid Khan, and Amad Ullah Khan. "Production of biofuels from micro ALGAE and green wastes through Anaerobic Digestion." In 2015 Power Generation Systems and Renewable Energy Technologies (PGSRET). IEEE, 2015. http://dx.doi.org/10.1109/pgsret.2015.7312230.

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Pahilwani, Vijay K., Yves Bellouard, Thomas Rhorlack, Ali A. Said, Mark Dugan, and Philippe Bado. "Towards a femtosecond laser micro-machined optofluidic device for distinguishing algae species." In International Symposium on Optomechatronic Technologies, edited by Yukitoshi Otani, Yves Bellouard, John T. Wen, Dalibor Hodko, Yoshitada Katagiri, Samuel K. Kassegne, Jonathan Kofman, et al. SPIE, 2008. http://dx.doi.org/10.1117/12.817321.

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Raees, Asmaa, and Radhouane Ben-hamadou. "Characterization of micro-algae species from Qatar coastal waters for animal feed production." In Qatar Foundation Annual Research Conference Proceedings. Hamad bin Khalifa University Press (HBKU Press), 2014. http://dx.doi.org/10.5339/qfarc.2014.eeop0146.

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Straub, Quinn, and Juan Ordonez. "A Methodology for the Determination of the Light Distribution Profile of a Micro-Algal Photobioreactor." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54830.

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The following work presents an in depth analysis of the distribution of the light absorbance profile. The proper identification of conditions that maximize the growth efficiency of photosynthetic algae is necessary to optimize the productivity as a whole of the photobioreactor. In an effort to understand light as it interacts with an absorbing species such as algae, various tests were completed to extrapolate extinction coefficient ε or a calibration curves based on Beer-Lamberts Law. To characterize the absorbance conditions in a photobioreactor, a light distribution model was developed. From the basis of an external radiated light system, a single-source system was developed. Mathematical expressions for the local light intensity and the average light intensity were derived for a cylindrical photobioreactor with external sources, single internal sources, and multiple internal sources. The proposed model was used to predict the light absorbance values inside an externally and internally radiated photobioreactor using Nannochloropsis Oculata. The effects of cell density and light path length were interpreted through experimental and model simulation studies. The predicted light intensity values were found to be within +/− 7% to those obtained experimentally. This level of accuracy could be better improved with more testing and more precise instrumentation. Due to the simplicity and flexibility of the proposed model, it was also possible to predict the light conditions in other complex multiple light source photobioreactors.
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Reports on the topic "Micro algae"

1

Negi, Sangeeta, Shawn Robert Starkenburg, and Richard Thomas (Dick) Sayre. Productivity and bioproduct formation in phototropic knock/out mutants in micro algae. Office of Scientific and Technical Information (OSTI), July 2020. http://dx.doi.org/10.2172/1641551.

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