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Journal articles on the topic 'Biopolymers from marine and bacterial origins'

Author: Grafiati

Published: 25 May 2024

Last updated: 31 July 2025

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1

Nurhadis, Nurhadis, Ahsanal Kasasiah, and Asman Hitopik. "Marine-Derived Chitosan Biopolymers as Antibacterial Agents: A Review." Jurnal Pijar Mipa 19, no. 6 (2024): 1104–10. https://doi.org/10.29303/jpm.v19i6.8021.

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The growing issue of bacterial resistance to conventional antibiotics has led to an increasing need for alternative antimicrobial agents. Chitosan, a biopolymer derived from marine organisms such as crustaceans (shrimp, crabs) and mollusks (shellfish), has shown significant antibacterial properties. This systematic review aims to evaluate the antibacterial activity of chitosan extracted from various marine sources against Gram-positive (Staphylococcus epidermidis) and Gram-negative (Escherichia coli) bacteria. A comprehensive search of studies published in the past decade was conducted across

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Drishya, Poova Kattil, M. Venkateswar Reddy, Gunda Mohanakrishna, et al. "Advances in Microbial and Plant-Based Biopolymers: Synthesis and Applications in Next-Generation Materials." Macromol 5, no. 2 (2025): 21. https://doi.org/10.3390/macromol5020021.

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Biopolymers are revolutionizing the materials landscape, driven by a growing demand for sustainable alternatives to traditional petroleum-based materials. Sourced from biological origins, these polymers are not only environment friendly but also present exciting solutions in healthcare, packaging, biosensors, high performance, and durable materials as alternatives to crude oil-based products. Recently, biopolymers derived from plants, such as lignin and cellulose, alongside those produced by bacteria, like polyhydroxyalkanoates (PHAs), have captured the spotlight, drawing significant interest

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Sobecky, Patricia A., Tracy J. Mincer, Michelle C. Chang, Aresa Toukdarian, and Donald R. Helinski. "Isolation of Broad-Host-Range Replicons from Marine Sediment Bacteria." Applied and Environmental Microbiology 64, no. 8 (1998): 2822–30. http://dx.doi.org/10.1128/aem.64.8.2822-2830.1998.

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ABSTRACT Naturally occurring plasmids isolated from heterotrophic bacterial isolates originating from coastal California marine sediments were characterized by analyzing their incompatibility and replication properties. Previously, we reported on the lack of DNA homology between plasmids from the culturable bacterial population of marine sediments and the replicon probes specific for a number of well-characterized incompatibility and replication groups (P. A. Sobecky, T. J. Mincer, M. C. Chang, and D. R. Helinski, Appl. Environ. Microbiol. 63:888–895, 1997). In the present study we isolated 1.

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Tassara, Eleonora, Caterina Oliveri, Luigi Vezzulli, et al. "2D Collagen Membranes from Marine Demosponge Chondrosia reniformis (Nardo, 1847) for Skin-Regenerative Medicine Applications: An In Vitro Evaluation." Marine Drugs 21, no. 8 (2023): 428. http://dx.doi.org/10.3390/md21080428.

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Research in tissue engineering and regenerative medicine has an ever-increasing need for innovative biomaterials suitable for the production of wound-dressing devices and artificial skin-like substitutes. Marine collagen is one of the most promising biomaterials for the production of such devices. In this study, for the first time, 2D collagen membranes (2D-CMs) created from the extracellular matrix extract of the marine demosponge Chondrosia reniformis have been evaluated in vitro as possible tools for wound healing. Fibrillar collagen was extracted from a pool of fresh animals and used for t

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Cottrell, Matthew T., Jessica A. Moore, and David L. Kirchman. "Chitinases from Uncultured Marine Microorganisms." Applied and Environmental Microbiology 65, no. 6 (1999): 2553–57. http://dx.doi.org/10.1128/aem.65.6.2553-2557.1999.

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ABSTRACT Our understanding of the degradation of organic matter will benefit from a greater appreciation for the genes encoding enzymes involved in the hydrolysis of biopolymers such as chitin, one of the most abundant polymers in nature. To isolate representative and abundant chitinase genes from uncultivated marine bacteria, we constructed libraries of genomic DNA isolated from coastal and estuarine waters. The libraries were screened for genes encoding proteins that hydrolyze a fluorogenic analogue of chitin, 4-methylumbelliferyl β-d-N,N′-diacetylchitobioside (MUF-diNAG). The abundance of c

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Valdés-Castro, Valentina, Humberto E. González, Ricardo Giesecke, Camila Fernández, and Verónica Molina. "Assessment of Microbial Community Composition Changes in the Presence of Phytoplankton-Derived Exudates in Two Contrasting Areas from Chilean Patagonia." Diversity 14, no. 3 (2022): 195. http://dx.doi.org/10.3390/d14030195.

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Patagonian fjords and channels in southern Chile are heterogeneous ecosystems characterized by the interaction of estuarine and marine waters influencing physical-chemical conditions and biological assemblages. Besides salinity, microbial communities from estuarine and marine origin are naturally subjected to changing organic matter quality and variable nutrient concentrations. In this study, we tackle the response of the bacterial community from estuarine and marine origins associated with two size classes (<0.7 µm and <1.6 µm) to the addition of sterile phytoplankton-derived exudates (

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Mostafa, Yasser S., Sulaiman A. Alrumman, Kholod A. Otaif, Saad A. Alamri, Mohamed S. Mostafa, and Taher Sahlabji. "Production and Characterization of Bioplastic by Polyhydroxybutyrate Accumulating Erythrobacter aquimaris Isolated from Mangrove Rhizosphere." Molecules 25, no. 1 (2020): 179. http://dx.doi.org/10.3390/molecules25010179.

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The synthesis of bioplastic from marine microbes has a great attendance in the realm of biotechnological applications for sustainable eco-management. This study aims to isolate novel strains of poly-β-hydroxybutyrate (PHB)-producing bacteria from the mangrove rhizosphere, Red Sea, Saudi Arabia, and to characterize the extracted polymer. The efficient marine bacterial isolates were identified by the phylogenetic analysis of the 16S rRNA genes as Tamlana crocina, Bacillus aquimaris, Erythrobacter aquimaris, and Halomonas halophila. The optimization of PHB accumulation by E. aquimaris was achieve

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Ramesh, Chatragadda, Bhushan Rao Tulasi, Mohanraju Raju, Narsinh Thakur, and Laurent Dufossé. "Marine Natural Products from Tunicates and Their Associated Microbes." Marine Drugs 19, no. 6 (2021): 308. http://dx.doi.org/10.3390/md19060308.

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Marine tunicates are identified as a potential source of marine natural products (MNPs), demonstrating a wide range of biological properties, like antimicrobial and anticancer activities. The symbiotic relationship between tunicates and specific microbial groups has revealed the acquisition of microbial compounds by tunicates for defensive purpose. For instance, yellow pigmented compounds, “tambjamines”, produced by the tunicate, Sigillina signifera (Sluiter, 1909), primarily originated from their bacterial symbionts, which are involved in their chemical defense function, indicating the ecolog

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Zhang, Hongcai, Zekai Wang, Xi Yu, et al. "The Phylogeny and Metabolic Potentials of a Lignocellulosic Material-Degrading Aliiglaciecola Bacterium Isolated from Intertidal Seawater in East China Sea." Microorganisms 12, no. 1 (2024): 144. http://dx.doi.org/10.3390/microorganisms12010144.

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Lignocellulosic materials are composed of cellulose, hemicellulose and lignin and are one of the most abundant biopolymers in marine environments. The extent of the involvement of marine microorganisms in lignin degradation and their contribution to the oceanic carbon cycle remains elusive. In this study, a novel lignin-degrading bacterial strain, LCG003, was isolated from intertidal seawater in Lu Chao Harbor, East China Sea. Phylogenetically, strain LCG003 was affiliated with the genus Aliiglaciecola within the family Alteromonadaceae. Metabolically, strain LCG003 contains various extracellu

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Champion, Marie, Emilie Portier, Karine Vallée-Réhel, et al. "Anti-Biofilm Activity of a Hyaluronan-like Exopolysaccharide from the Marine Vibrio MO245 against Pathogenic Bacteria." Marine Drugs 20, no. 11 (2022): 728. http://dx.doi.org/10.3390/md20110728.

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Biofilms, responsible for many serious drawbacks in the medical and marine environment, can grow on abiotic and biotic surfaces. Commercial anti-biofilm solutions, based on the use of biocides, are available but their use increases the risk of antibiotic resistance and environmental pollution in marine industries. There is an urgent need to work on the development of ecofriendly solutions, formulated without biocidal agents, that rely on the anti-adhesive physico-chemical properties of their materials. In this context, exopolysaccharides (EPSs) are natural biopolymers with complex properties t

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Guerra, LV, F. Savergnini, FS Silva, MC Bernardes, and MAC Crapez. "Biochemical and microbiological tools for the evaluation of environmental quality of a coastal lagoon system in Southern Brazil." Brazilian Journal of Biology 71, no. 2 (2011): 461–68. http://dx.doi.org/10.1590/s1519-69842011000300016.

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This study aimed to evaluate the environmental quality of surface water of the Maricá Lagoon System through physicochemical, biochemical and microbiological parameters, in order to assess its environmental quality. Marine influence over the system was evidenced by the salinity and temperature gradients, where the most distant point, in Maricá Lagoon, presented the largest protein, lipid and biopolymeric carbon concentrations. Biopolymers, with predominance of lipids, presented a pattern that differs from the literature for coastal sediments. The concentration of thermotolerant coliforms charac

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M., Jyothi, and Suneetha Vuppu. "Characteristics of the luminous Photobacterium leiognathi from the Andaman and Nicobar Islands seawater as a source of eco-friendly biopolymers and a tool for toxicity analysis." Research Journal of Biotechnology 19, no. 10 (2024): 13–30. http://dx.doi.org/10.25303/1910rjbt013030.

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Plastic, a synthetic polymer widely utilized in contemporary industry, poses significant risks to consumers' health and the environment in many ways, with numerous research approaches demonstrating its detrimental effects on human health. Traditional plastic products generally require 100–1000 years to break down in landfills, contaminating nearby water and air. Considering this, the potential marine luminous bacteria was isolated from Andaman Sea to produce eco-friendly bio-polymers which remain largely unexplored. In this research, an indigenous potential bioluminescent bacterial strain, VIT

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Wibowo, Joko Tri, Asep Bayu, Widya Dwi Aryati, et al. "Secondary Metabolites from Marine-Derived Bacteria with Antibiotic and Antibiofilm Activities against Drug-Resistant Pathogens." Marine Drugs 21, no. 1 (2023): 50. http://dx.doi.org/10.3390/md21010050.

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The search for new antibiotics against drug-resistant microbes has been expanded to marine bacteria. Marine bacteria have been proven to be a prolific source of a myriad of novel compounds with potential biological activities. Therefore, this review highlights novel and bioactive compounds from marine bacteria reported during the period of January 2016 to December 2021. Published articles containing novel marine bacterial secondary metabolites that are active against drug-resistant pathogens were collected. Previously described compounds (prior to January 2016) are not included in this review.

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Wörmer, Lars, Tatsuhiko Hoshino, Marshall W. Bowles, et al. "Microbial dormancy in the marine subsurface: Global endospore abundance and response to burial." Science Advances 5, no. 2 (2019): eaav1024. http://dx.doi.org/10.1126/sciadv.aav1024.

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Marine sediments host an unexpectedly large microbial biosphere, suggesting unique microbial mechanisms for surviving burial and slow metabolic turnover. Although dormancy is generally considered an important survival strategy, its specific role in subsurface sediments remains unclear. We quantified dormant bacterial endospores in 331 marine sediment samples from diverse depositional types and geographical origins. The abundance of endospores relative to vegetative cells increased with burial depth and endospores became dominant below 25 m, with an estimated population of 2.5 × 1028to 1.9 × 10

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Burroughs, A. Max, and L. Aravind. "Innate immunity and bacterial conflict: the deep origins of cGAS-STING signaling and discovery of uncharacterized animal immunity pathways." Journal of Immunology 204, no. 1_Supplement (2020): 68.25. http://dx.doi.org/10.4049/jimmunol.204.supp.68.25.

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Abstract Just as animal innate immunity pits endogenous response pathways against invading extragenic threats, microbiomes are governed by myriad pathways mediating inter-genomic resource procurement, collectively known as ‘conflict systems.’ Leveraging the continually-increasing amount of genome data, we have probed such systems and in the process uncovered the evolutionary origins of core components of animal immunity. This includes the discovery that cyclic-nucleotide synthesizing enzymes like human cGAS and OAS1 and their receptors like STING were acquired from comparable conflict-triggere

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Gu, Ailiang, and Christopher John Eastoe. "The Origins of Sulfate in Cenozoic Non-Marine Evaporites in the Basin and-Range Province, Southwestern North America." Geosciences 11, no. 11 (2021): 455. http://dx.doi.org/10.3390/geosciences11110455.

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Cenozoic evaporites (gypsum and anhydrite) in southwestern North America have wide ranges of δ34S (−30 to +22‰; most +4 to +10‰) and δ18OSO4 (+3 to +19‰). New data are presented for five basins in southern Arizona. The evaporites were deposited in playas or perennial saline lakes in closed basins of Oligocene or younger age. Very large accumulations in Picacho, Safford and Tucson Basins have isotope compositions plotting close to a linear δ34S-δ18OSO4 relationship corresponding to mixing of two sources of sulfur: (1) sulfate recycled from Permian marine gypsum and (2) sulfate from weathering o

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Cydzik-Kwiatkowska, Agnieszka, Sławomir Ciesielski, Maciej Florczyk, et al. "Biopolymer Production in a Full-Scale Activated Sludge Wastewater Treatment Plant: Seasonal Changes and Promising Bacterial Producers." Energies 17, no. 24 (2024): 6231. https://doi.org/10.3390/en17246231.

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Wastewater treatment plants (WWTPs) offer the possibility of recovering valuable substances produced by microorganisms, such as extracellular polymeric substances (EPSs). This study aimed to investigate the generation and properties of biopolymers and microbial communities of activated sludge from a large, full-scale WWTP. EPS composition in the activated sludge changed mostly during the transition period from winter to spring. Higher temperatures favored higher protein (PN) concentrations and a higher PN/PSs (polysaccharides) ratio in tightly-bound EPS, stimulating bacterial aggregation. In t

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Han, Heejun, Jeomshik Hwang, and Guebuem Kim. "Characterizing the origins of dissolved organic carbon in coastal seawater using stable carbon isotope and light absorption characteristics." Biogeosciences 18, no. 5 (2021): 1793–801. http://dx.doi.org/10.5194/bg-18-1793-2021.

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Abstract. In order to determine the origins of dissolved organic matter (DOM) occurring in the seawater of Sihwa Lake, we measured the stable carbon isotope ratios of dissolved organic carbon (DOC-δ13C) and the optical properties (absorbance and fluorescence) of DOM in two different seasons (March 2017 and September 2018). Sihwa Lake is enclosed by a dike along the western coast of South Korea, and the water is exchanged with the Yellow Sea twice a day through the sluice gates. The DOC concentrations were generally higher in lower-salinity waters in both periods, and excess of DOC was also obs

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Arrigoni, Roberto, Andrea Ballini, Emilio Jirillo, and Luigi Santacroce. "Current View on Major Natural Compounds Endowed with Antibacterial and Antiviral Effects." Antibiotics 13, no. 7 (2024): 603. http://dx.doi.org/10.3390/antibiotics13070603.

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Nowadays, infectious diseases of bacterial and viral origins represent a serious medical problem worldwide. In fact, the development of antibiotic resistance is responsible for the emergence of bacterial strains that are refractory even to new classes of antibiotics. Furthermore, the recent COVID-19 pandemic suggests that new viruses can emerge and spread all over the world. The increase in infectious diseases depends on multiple factors, including malnutrition, massive migration of population from developing to industrialized areas, and alteration of the human microbiota. Alternative treatmen

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Do, Thanh Ngoc, and Luan Thi Bui. "Correlations between geochemical characteristics of source rocks and chemical compositions of crude oils from LD field, block 15-1/05, Cuu Long basin." Science and Technology Development Journal - Natural Sciences 1, T3 (2017): 109–20. http://dx.doi.org/10.32508/stdjns.v1it3.457.

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LD field is the second oil discovery on offshore Block 15-1/05, which is located 15 kilometres East-North East of the first discovery (LDN field). The major aim of this study is to evaluate correlations between accumulated hydrocarbons and source rocks of LD structure, in order to verify their potential for generating oil and gas. Therefore, the authors have synthesized and analyzed geochemical and biomarker characteristics, structures, and chemical compositions of crude oils and source rock extracts by gas chromatography–mass spectrometry analysis to interpret hydrocarbon origins of the LD fi

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Beckett, Stephen J., and Hywel T. P. Williams. "Coevolutionary diversification creates nested-modular structure in phage–bacteria interaction networks." Interface Focus 3, no. 6 (2013): 20130033. http://dx.doi.org/10.1098/rsfs.2013.0033.

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Phage and their bacterial hosts are the most diverse and abundant biological entities in the oceans, where their interactions have a major impact on marine ecology and ecosystem function. The structure of interaction networks for natural phage–bacteria communities offers insight into their coevolutionary origin. At small phylogenetic scales, observed communities typically show a nested structure, in which both hosts and phages can be ranked by their range of resistance and infectivity, respectively. A qualitatively different multi-scale structure is seen at larger phylogenetic scales; a natura

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Pidot, Sacha J., Stephan Klatt, Louis S. Ates, et al. "Marine sponge microbe provides insights into evolution and virulence of the tubercle bacillus." PLOS Pathogens 20, no. 8 (2024): e1012440. http://dx.doi.org/10.1371/journal.ppat.1012440.

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Reconstructing the evolutionary origins of Mycobacterium tuberculosis, the causative agent of human tuberculosis, has helped identify bacterial factors that have led to the tubercle bacillus becoming such a formidable human pathogen. Here we report the discovery and detailed characterization of an exceedingly slow growing mycobacterium that is closely related to M. tuberculosis for which we have proposed the species name Mycobacterium spongiae sp. nov., (strain ID: FSD4b-SM). The bacterium was isolated from a marine sponge, taken from the waters of the Great Barrier Reef in Queensland, Austral

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De la Iglesia, Rodrigo, Isidora Echenique-Subiabre, Susana Rodríguez-Marconi, et al. "Distinct oxygen environments shape picoeukaryote assemblages thriving oxygen minimum zone waters off central Chile." Journal of Plankton Research 42, no. 5 (2020): 514–29. http://dx.doi.org/10.1093/plankt/fbaa036.

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Abstract Oxygen minimum zones (OMZs) support ocean biogeochemical cycles of global importance. The OMZ off central Chile is characterized by seasonally variable oxygen concentrations due to upwelling events. Bacterial and archaeal communities from this area have been previously described; however, picoeukaryote communities remain largely unexplored. In order to improve our knowledge on picoeukaryote ecology and the effect of controlling factors on its community structure, environmental parameters and 18S rRNA metabarcoding analyses were performed in water samples collected at several depths at

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Maki, Teruya, Kazutaka Hara, Ayumu Iwata, et al. "Variations in airborne bacterial communities at high altitudes over the Noto Peninsula (Japan) in response to Asian dust events." Atmospheric Chemistry and Physics 17, no. 19 (2017): 11877–97. http://dx.doi.org/10.5194/acp-17-11877-2017.

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Abstract. Aerosol particles, including airborne microorganisms, are transported through the free troposphere from the Asian continental area to the downwind area in East Asia and can influence climate changes, ecosystem dynamics, and human health. However, the variations present in airborne bacterial communities in the free troposphere over downwind areas are poorly understood, and there are few studies that provide an in-depth examination of the effects of long-range transport of aerosols (natural and anthropogenic particles) on bacterial variations. In this study, the vertical distributions

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Lacroix, Gilles L., and Derek Knox. "Distribution of Atlantic salmon (Salmo salar) postsmolts of different origins in the Bay of Fundy and Gulf of Maine and evaluation of factors affecting migration, growth, and survival." Canadian Journal of Fisheries and Aquatic Sciences 62, no. 6 (2005): 1363–76. http://dx.doi.org/10.1139/f05-055.

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Atlantic salmon (Salmo salar) postsmolts surveyed by surface trawling in the Bay of Fundy and Gulf of Maine during 20012003 were aggregated in several areas in the Bay of Fundy and dispersed over a broader area in the Gulf of Maine. Postsmolt distribution reflected the major surface-current vectors and was independent of origin (wild vs. hatchery, inner vs. outer Bay of Fundy). Migration proceeded without disruption, and marked wild postsmolts from both the inner and outer Bay of Fundy were recaptured in the outer Bay of Fundy and the Gulf of Maine, where their distribution overlapped the com

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Del Cortona, Andrea, Christopher J. Jackson, François Bucchini, et al. "Neoproterozoic origin and multiple transitions to macroscopic growth in green seaweeds." Proceedings of the National Academy of Sciences 117, no. 5 (2020): 2551–59. http://dx.doi.org/10.1073/pnas.1910060117.

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The Neoproterozoic Era records the transition from a largely bacterial to a predominantly eukaryotic phototrophic world, creating the foundation for the complex benthic ecosystems that have sustained Metazoa from the Ediacaran Period onward. This study focuses on the evolutionary origins of green seaweeds, which play an important ecological role in the benthos of modern sunlit oceans and likely played a crucial part in the evolution of early animals by structuring benthic habitats and providing novel niches. By applying a phylogenomic approach, we resolve deep relationships of the core Chlorop

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Zafeiropoulos, Haris, Laura Gargan, Christina Pavloudi, Evangelos Pafilis та Jens Carlsson. "Bacteria are everywhere, even in your COI data: Τhe art of getting to know the unknown unknowns and shine light on the dark matter!" ARPHA Conference Abstracts 4 (4 березня 2021): e64966. https://doi.org/10.3897/aca.4.e64966.

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Environmental DNA (eDNA) metabarcoding has been commonly used in recent years (Jeunen et al. 2019) for the identification of the species composition of environmental samples. By making use of genetic markers anchored in conserved gene regions, universally present acrooss the species of large taxonomy groups, eDNA metabarcoding exploits both extra- and intra-cellular DNA fragments for biodiversity assessment.However, there is not a truly "universal" marker gene that is capable of amplifying all species across different taxa (Kress et al. 2015). The mitochondrial cytochrome C oxidase subunit I g

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Sageman, Bradley B., and Erle G. Kauffman. "Benthic community analysis and the prediction of organic carbon content in Mesozoic black shale facies." Paleontological Society Special Publications 6 (1992): 258. http://dx.doi.org/10.1017/s2475262200008182.

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The burial and preservation of significant quantities of marine organic matter in epicontinental basins results from low bottom water oxygen levels, and moderate to low sedimentation rates of fine-grained siliciclastic sediment under at least moderately productive waters. Because benthic biotas are extremely sensitive to such factors as bottom water oxygen, grain size, substrate consistency and sedimentation rate, there is a potentially predictive relationship between biofacies and Corg potential of marine strata. High-resolution biological, sedimentological and geochemical studies of Mesozoic

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Rodela, T. M., J. S. Ballantyne, and P. A. Wright. "Carrier-mediated urea transport across the mitochondrial membrane of an elasmobranch (Raja erinacea) and a teleost (Oncorhynchus mykiss) fish." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 294, no. 6 (2008): R1947—R1957. http://dx.doi.org/10.1152/ajpregu.00251.2007.

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In osmoregulating teleost fish, urea is a minor nitrogen excretory product, whereas in osmoconforming marine elasmobranchs it serves as the major tissue organic solute and is retained at relatively high concentrations (∼400 mmol/l). We tested the hypothesis that urea transport across liver mitochondria is carrier mediated in both teleost and elasmobranch fishes. Intact liver mitochondria in rainbow trout ( Oncorhynchus mykiss) demonstrated two components of urea uptake, a linear component at high concentrations and a phloretin-sensitive saturable component [Michaelis constant ( Km) = 0.58 mmol

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Besednova, NN, TS Zaporozhets, TA Kuznetsova, et al. "Biologically Active Substances from Marine Hydrobionts of the Pacific Ocean as the Basis for Developing New Medicines." ЗДОРОВЬЕ НАСЕЛЕНИЯ И СРЕДА ОБИТАНИЯ - ЗНиСО / PUBLIC HEALTH AND LIFE ENVIRONMENT, May 2021, 78–83. http://dx.doi.org/10.35627/2219-5238/2021-338-5-78-83.

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Introduction: Since 1970s, a school of thought on management of innate and acquired immunity systems using biologically active substances of the Far East marine origin has been developed by the Immunology Laboratory of Somov Research Institute of Epidemiology and Microbiology of the Russian Federal Service for Surveillance on Consumer Rights Protection and Human Wellbeing (Rospotrebnadzor). Biopolymers, which constitute the structural basis of live marine organisms and sustain numerous vital processes, draw special attention as potential candidates for pharmaceutical forms. The objective of ou

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Meunier, Laurence, Rodrigo Costa, Tina Keller-Costa, David Cannella, Etienne Dechamps, and Isabelle F. George. "Selection of marine bacterial consortia efficient at degrading chitin leads to the discovery of new potential chitin degraders." Microbiology Spectrum, September 24, 2024. http://dx.doi.org/10.1128/spectrum.00886-24.

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ABSTRACT Chitin degradation is a keystone process in the oceans, mediated by marine microorganisms with the help of several enzymes, mostly chitinases. Sediment, seawater, and filter-feeding marine invertebrates, such as sponges, are known to harbor chitin-degrading bacteria and are presumably hotspots for chitin turnover. Here, we employed an artificial selection process involving enrichment cultures derived from microbial communities associated with the marine sponge Hymeniacidon perlevis , its surrounding seawater and sediment, to select bacterial consortia capable of degrading raw chitin.

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Li, Minchun, Wei Xie, Chuanlun Zhang, and Kedong Yin. "Linking Bacterial Communities to Optical-Derived Properties of Porewater DOM in Sediments in the Coastal East China Sea." Frontiers in Marine Science 9 (June 21, 2022). http://dx.doi.org/10.3389/fmars.2022.919368.

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Bacterial communities and porewater dissolved organic matter (DOM) pool are intimately interactive in sedimentary environments. Estuarine coastal regions are an interactive area between terrestrial and marine influences in terms of DOM origins and freshness. Yet, we know little about the relationships between the bacterial communities and DOM in those regions. In this study, porewater DOM samples were collected from 42 sites in the coastal East China Sea. The porewater DOM optical properties were determined by fluorescence and absorption spectra, while the corresponding bacterial community com

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Satari, Leila, Alba Guillén, Adriel Latorre-Pérez, and Manuel Porcar. "Beyond Archaea: The Table Salt Bacteriome." Frontiers in Microbiology 12 (October 29, 2021). http://dx.doi.org/10.3389/fmicb.2021.714110.

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Commercial table salt is a condiment with food preservative properties by decreasing water activity and increasing osmotic pressure. Salt is also a source of halophilic bacteria and archaea. In the present research, the diversity of halotolerant and halophilic microorganisms was studied in six commercial table salts by culture-dependent and culture-independent techniques. Three table salts were obtained from marine origins: Atlantic Ocean, Mediterranean (Ibiza Island), and Odiel marshes (supermarket marine salt). Other salts supplemented with mineral and nutritional ingredients were also used:

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Erkorkmaz, Burak Adnan, Daniella Gat, and Yinon Rudich. "Aerial transport of bacteria by dust plumes in the Eastern Mediterranean revealed by complementary rRNA/rRNA-gene sequencing." Communications Earth & Environment 4, no. 1 (2023). http://dx.doi.org/10.1038/s43247-023-00679-8.

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AbstractProcesses influencing the transport of airborne bacterial communities in the atmosphere are poorly understood. Here, we report comprehensive and quantitative evidence of the key factors influencing the transport of airborne bacterial communities by dust plumes in the Eastern Mediterranean. We extracted DNA and RNA from size-resolved aerosols sampled from air masses of different origins, followed by qPCR and high-throughput amplicon sequencing of 16 S ribosomal RNA gene and transcripts. We find that airborne bacterial community composition varied with air mass origin and particle size.

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Gopal, Judy, Manikandan Muthu, Thirumalai Dhakshanamurthy, et al. "Sustainable ecofriendly phytoextract mediated one pot green recovery of chitosan." Scientific Reports 9, no. 1 (2019). http://dx.doi.org/10.1038/s41598-019-50133-z.

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Abstract Chitin and chitosan are biopolymers that have diverse applications in medicine, agriculture, food, cosmetics, pharmaceuticals, wastewater treatment and textiles. With bio-origins, they easily blend with biological systems and show exemplified compatibility which is mandatory when it comes to biomedical research. Chitin and chitosan are ecofriendly, however the processes that are used to recover them aren’t ecofriendly. The focus of this work is to attempt an ecofriendly, sustainable phytomediated one pot recovery of chitosan from commercial chitin and from crab and shrimp shells and s

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Darya, Mehrnoosh, Mehdi Haji Abdolrasouli, Morteza Yousefzadi, Mir Masoud Sajjadi, Iman Sourinejad, and Maaroof Zarei. "Antifouling coating based on biopolymers (PCL/ PLA) and bioactive extract from the sea cucumber Stichopus herrmanni." AMB Express 12, no. 1 (2022). http://dx.doi.org/10.1186/s13568-022-01364-3.

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AbstractAn important challenge to decrease the toxic effects of the common biocides in marine environments and to achieve suitable ecofriendly natural antifouling coatings is to find effective natural antifoulants and efficient biodegradable coatings. In this study, antifouling activities of nine bioactive extracts (non-polar to polar) from different organs of the sea cucumber Stichopus herrmanni were tested against five bacterial strains, barnacle and brine shrimp larvae. The ethyl acetate extract of the body wall showed the highest in-vitro antifouling activity including high antibacterial a

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Gupta, Annika Durve, Shivani Kakkar Khanna, and Pooja Gupta. "Isolation and Characterization of Extracellular Chitinase Produced by Chitinolytic Bacteria Isolated from Soil Samples." Asian Journal of Microbiology and Biotechnology, May 3, 2023, 16–24. http://dx.doi.org/10.56557/ajmab/2023/v8i28225.

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Chitin is one of the most common biopolymers found in both marine and terrestrial habitats. Chitinase enzyme has gained popularity due to its diverse biotechnological applications, particularly in agriculture for the biocontrol of phytopathogenic fungi and harmful insects. In this work bacteria producing chitinase enzyme were isolated from soil and water samples. Three bacterial isolates C2, C3, and C4 were found to be Gram-negative coccobacilli while bacterial isolate C9 was found to be Gram-positive cocci. The optimum pH and temperature for all the isolates were studied. The effect of pH, te

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Elsayis, Asmaa, Sahar W. M. Hassan, Khaled M. Ghanem, and Heba Khairy. "Suggested Sustainable Medical and Environmental Uses of Melanin Pigment From Halotolerant Black Yeast Hortaea werneckii AS1." Frontiers in Microbiology 13 (April 13, 2022). http://dx.doi.org/10.3389/fmicb.2022.871394.

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The marine ecosystem is a complex niche with unique environmental circumstances. Microbial communities from the sea are one of the main origins of compounds with tremendous capabilities. Marine yeasts have the ability to produce secondary metabolites that are architecturally distinct from those found in terrestrial species. Melanin pigment synthesized by marine halotolerant black yeast Hortaea werneckii AS1 isolated from Mediterranean salt lakes in Alexandria, Egypt was found to exert a radical scavenging effect on 2,2-diphenyl-1-picrylhydrazyl (DPPH) with an IC50 of 61.38 μg/ml. Furthermore,

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Ghaly, Timothy M., Sasha G. Tetu, and Michael R. Gillings. "Predicting the taxonomic and environmental sources of integron gene cassettes using structural and sequence homology of attC sites." Communications Biology 4, no. 1 (2021). http://dx.doi.org/10.1038/s42003-021-02489-0.

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AbstractIntegrons are bacterial genetic elements that can capture mobile gene cassettes. They are mostly known for their role in the spread of antibiotic resistance cassettes, contributing significantly to the global resistance crisis. These resistance cassettes likely originated from sedentary chromosomal integrons, having subsequently been acquired and disseminated by mobilised integrons. However, their taxonomic and environmental origins are unknown. Here, we use cassette recombination sites (attCs) to predict the origins of those resistance cassettes now spread by mobile integrons. We mode

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Panwar, Pratibha, Michelle A. Allen, Timothy J. Williams, et al. "Influence of the polar light cycle on seasonal dynamics of an Antarctic lake microbial community." Microbiome 8, no. 1 (2020). http://dx.doi.org/10.1186/s40168-020-00889-8.

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Abstract Background Cold environments dominate the Earth’s biosphere and microbial activity drives ecosystem processes thereby contributing greatly to global biogeochemical cycles. Polar environments differ to all other cold environments by experiencing 24-h sunlight in summer and no sunlight in winter. The Vestfold Hills in East Antarctica contains hundreds of lakes that have evolved from a marine origin only 3000–7000 years ago. Ace Lake is a meromictic (stratified) lake from this region that has been intensively studied since the 1970s. Here, a total of 120 metagenomes representing a season

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Kim, Hiyoung, Jiyeong Ahn, Jaebum Kim, and Hahk-Soo Kang. "Metagenomic insights and biosynthetic potential of Candidatus Entotheonella symbiont associated with Halichondria marine sponges." Microbiology Spectrum, November 22, 2024. http://dx.doi.org/10.1128/spectrum.02355-24.

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ABSTRACT Korea, being surrounded by the sea, provides a rich habitat for marine sponges, which have been a prolific source of bioactive natural products. Although a diverse array of structurally novel natural products has been isolated from Korean marine sponges, their biosynthetic origins remain largely unknown. To explore the biosynthetic potential of Korean marine sponges, we conducted metagenomic analyses of sponges inhabiting the East Sea of Korea. This analysis revealed a symbiotic association of Candidatus Entotheonella bacteria with Halichondria sponges. Here, we report a new chemicall

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Tarquinio, Flavia, Océane Attlan, Mathew A. Vanderklift, Oliver Berry, and Andrew Bissett. "Distinct Endophytic Bacterial Communities Inhabiting Seagrass Seeds." Frontiers in Microbiology 12 (September 21, 2021). http://dx.doi.org/10.3389/fmicb.2021.703014.

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Seagrasses are marine angiosperms that can live completely or partially submerged in water and perform a variety of significant ecosystem services. Like terrestrial angiosperms, seagrasses can reproduce sexually and, the pollinated female flower develop into fruits and seeds, which represent a critical stage in the life of plants. Seed microbiomes include endophytic microorganisms that in terrestrial plants can affect seed germination and seedling health through phytohormone production, enhanced nutrient availability and defence against pathogens. However, the characteristics and origins of th

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Meng, Xiangyu, Fangyi Chen, Ming Xiong, Hua Hao, and Ke-Jian Wang. "A new pathogenic isolate of Kocuria kristinae identified for the first time in the marine fish Larimichthys crocea." Frontiers in Microbiology 14 (April 25, 2023). http://dx.doi.org/10.3389/fmicb.2023.1129568.

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In recent years, new emerging pathogenic microorganisms have frequently appeared in animals, including marine fish, possibly due to climate change, anthropogenic activities, and even cross-species transmission of pathogenic microorganisms among animals or between animals and humans, which poses a serious issue for preventive medicine. In this study, a bacterium was clearly characterized among 64 isolates from the gills of diseased large yellow croaker Larimichthys crocea that were raised in marine aquaculture. This strain was identified as K. kristinae by biochemical tests with a VITEK 2.0 ana

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Liu, Siwei, Shan Yu, Xindi Lu, et al. "Microbial communities associated with thermogenic gas hydrate-bearing marine sediments in Qiongdongnan Basin, South China Sea." Frontiers in Microbiology 13 (October 25, 2022). http://dx.doi.org/10.3389/fmicb.2022.1032851.

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Biogenic and thermogenic gas are two major contributors to gas hydrate formation. Methane hydrates from both origins may have critical impacts on the ecological properties of marine sediments. However, research on microbial diversity in thermogenic hydrate-containing sediments is limited. This study examined the prokaryotic diversity and distributions along a sediment core with a vertical distribution of thermogenic gas hydrates with different occurrences obtained from the Qiongdongnan Basin by Illumina sequencing of 16S rRNA genes as well as molecular and geochemical techniques. Here, we show

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Killops, S. D., A. N. Bishop, E. W. Tegelaar, K. Urdal, M. R. K. Ghammari, and J. W. H. Weijers. "Sedimentary diterpane origins—inferences from oils of varying source depositional environment and age." Frontiers in Geochemistry 1 (August 31, 2023). http://dx.doi.org/10.3389/fgeoc.2023.1241784.

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The potential of C20 tricyclic and tetracyclic diterpane distributions in oils (and by extension, rock extracts) to aid the interpretation of sources of organic matter and depositional environments—spanning carbonate, marl, freshwater and saline lacustrine, normal marine and transitional—from Neoproterozoic to Neogene, is investigated using GC-MS and GC-MS-MS analysis of a range of oils of known origin. Contributions from gymnosperms are readily distinguished by abundant characteristic tricyclics and/or tetracyclics [e.g., 5β(H)-rimuane, 5β(H)-rosane, isopimarane and phyllocladanes]. Even at l

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Möller, Lars, Yevhen Vainshtein, Bettina Meyer, et al. "Rich microbial and depolymerising diversity in Antarctic krill gut." Microbiology Spectrum, March 11, 2024. http://dx.doi.org/10.1128/spectrum.04035-23.

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ABSTRACT With almost a quadrillion individuals, the Antarctic krill processes five million tons of organic carbon every day during austral summer. This high carbon flux requires a broad range of hydrolytic enzymes to decompose the diverse food-derived biopolymers. While krill itself possesses numerous such enzymes, it is unclear, to what extent the endogenous microbiota contribute to the hydrolytic potential of the gut environment. Here we applied amplicon sequencing, shotgun metagenomics, cultivation, and physiological assays to characterize the krill gut microbiota. The broad bacterial diver

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Dong, Xiyang, Jayne E. Rattray, D. Calvin Campbell, et al. "Thermogenic hydrocarbon biodegradation by diverse depth-stratified microbial populations at a Scotian Basin cold seep." Nature Communications 11, no. 1 (2020). http://dx.doi.org/10.1038/s41467-020-19648-2.

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AbstractAt marine cold seeps, gaseous and liquid hydrocarbons migrate from deep subsurface origins to the sediment-water interface. Cold seep sediments are known to host taxonomically diverse microorganisms, but little is known about their metabolic potential and depth distribution in relation to hydrocarbon and electron acceptor availability. Here we combined geophysical, geochemical, metagenomic and metabolomic measurements to profile microbial activities at a newly discovered cold seep in the deep sea. Metagenomic profiling revealed compositional and functional differentiation between near-

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Tawfeek, Walaa S., Amina S. Kassab, Lamiaa A. Okasha, Mohamed Abdelsalam, and Ahmed H. Sherif. "The phenotypic and genetic characteristics of Pseudomonas anguilliseptica strains associated with mortalities in farmed sea bream and sea bass." Aquaculture International, December 11, 2023. http://dx.doi.org/10.1007/s10499-023-01360-9.

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AbstractTo investigate the presence of Pseudomonas anguilliseptica, one hundred specimens of sea bream (Sparus aurata) and sea bass (Dicentrarchus labrax) were collected alongside water samples during episodes of widespread fish mortality in marine fish farms located in the northern region of Egypt. This study documented the clinical and postmortem manifestations observed in moribund sea bream and sea bass, thus providing evidence for the occurrence of a septicemic-hemorrhagic bacterial disease. Fourteen strains of P. anguilliseptica were isolated and characterized from both sea bream and sea

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Worden, Paul J., Daniel R. Bogema, Melinda L. Micallef, et al. "Phylogenomic diversity of Vibrio species and other Gammaproteobacteria isolated from Pacific oysters (Crassostrea gigas) during a summer mortality outbreak." Microbial Genomics 8, no. 12 (2022). http://dx.doi.org/10.1099/mgen.0.000883.

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The Pacific oyster (PO), Crassostrea gigas, is an important commercial marine species but periodically experiences large stock losses due to disease events known as summer mortality. Summer mortality has been linked to environmental perturbations and numerous viral and bacterial agents, indicating this disease is multifactorial in nature. In 2013 and 2014, several summer mortality events occurred within the Port Stephens estuary (NSW, Australia). Extensive culture and molecular-based investigations were undertaken and several potentially pathogenic Vibrio species were identified. To improve sp

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Chess, Macie M., Saoirse Foley, and Charles A. Ettensohn. "Horizontal transfer of msp130 genes and the evolution of metazoan biocalcification." Genome Biology and Evolution, February 17, 2025. https://doi.org/10.1093/gbe/evaf028.

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Abstract The formation of calcified skeletons is crucial for the development, physiology, and ecology of many marine metazoans. The evolutionary origins of the genetic toolkit required for biocalcification are widely debated. MSP130 proteins, originally identified through their expression specifically by sea urchin skeletal cells, have been hypothesized to have been acquired by metazoans from bacteria through horizontal gene transfer (HGT). Here, we provide support for an HGT-based origin of metazoan MSP130 proteins by conducting phylogenetic and in silico protein analyses utilizing high-quali

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