Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 52 for “"Marine bacteria"”.
-
Iron and Manganese Homeostasis in Marine Bacteria
… the mechanisms of Mn and Fe homeostasis in the marine α‐proteobacterium Ruegeria pomeroyi (the main species studied here), and in other important marine bacteria. R. pomeroyi lacks most of the known Fe uptake systems, including TonB and outer‐membrane receptors, but has a predicted, but …
-
Physiological and ecological studies of mannitol utilizing marine bacteria
Bacteria were isolated from the kelp beds on the West Coast of South Africa. Strains isolated from the water column and kelp fronds were classified as Pseudomonas, Vibrio, Acinetobacter and Flavobacterium species. Bacterial diversity in adjacent kelp dominated habitats was examined using numerical …
-
On the molecular diversity of dimethylsulphoniopropionate catabolism by marine bacteria
… sulphur molecule in the oceans. Its breakdown by marine organisms is important for the global cycling of sulphur, and as a nutrient source for microbial life. In recent years, the molecular basis of DMSP catabolism by marine bacteria has begun to be unravelled, through the discovery of six …
-
Investigation of the Discoipyrroles and Other Marine Bacteria Derived Natural Products
Natural products are a rich source of scientific innovation. These chemical compounds are canonically celebrated as biomedical tools or synthetic chemistry feats. Discovery of new chemical compounds has benefited from the study of natural product biosynthesis, or the methods by which they are …
-
Marine bacteria as a source of dissolved fluorescence in the ocean
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1990.
-
Marine bacteria as a source of polyester-degrading enzymes with biocatalytic potential
… finding sustainable solutions for its control. Bacteria, which are among the earliest known forms of life, have evolved over millions of years to degrade organic matter found in the environment by producing enzymes that can catalyse the breakdown of various compounds for energy and nutrient …
-
Protein regulation in Trichodesmium and other marine bacteria: observational and interpretive biomarkers of biogeochemical processes
Marine microbes play key roles in global biogeochemistry by mediating chemical transformations and linking nutrient cycles to one another. A major goal in oceanography is to predict the activity of marine microbes across disparate ocean ecosystems. Towards this end, molecular biomarkers are …
-
Mechanisms and ecological implications of resistance to predation by heterotrophic ciliates expressed by marine bacteria
Bacteria are dominant organisms in the marine environment, providing the foundation for food webs that are essential for ecosystem structure and function. The ubiquity of bacteria in the marine environment is a result of their capacity to survive in many different niches. This is largely due to the …
-
Assimilatory sulfur metabolism in marine microorganisms
… organic sulfur compounds was studied in aerobic marine bacteria, with emphasis on the relationship between sulfur metabolism and protein synthesis. The goal of the study was to develop and apply a method for the quantitative assay of total bacterial protein synthesis in aerobic ocean waters. The …
-
Ecology and Synthetic Biology as Tools for Natural Products Discovery From Marine Proteobacteria
… compounds currently in use are derived from bacterial sources. Marine bacteria are prolific producers of fascinating bioactive secondary metabolites with structures and bioactivities that have recently attracted a lot of attention as leads for new pharmaceutical scaffolds. With recent …
-
Combining microbial functional metagenomics and Caenorhabditis elegans genetics to uncover and characterise novel bioactive compounds
Marine bacteria produce a wide array of biologically active metabolites involved in defence strategies and pathogenesis against a range of metazoans target organisms. In return bacteriovorous metazoans, including nematodes, have developed sophisticated strategies to neutralise or avoid such …
-
Physiological Characterization of Four Psychrophilic Marine Bacterial Strains
Four psychrophilic marine bacteria were characterized for taxonomic identification. All strains are Gram-negative obligate aerobes requiring seawater based medium. None of the four strains will grow at or above 22°C. All strains are orange-pigmented, encapsulated, and catalase positive. Strain …
-
Cloning and molecular characterisation of four alginate lyase genes from Vibrio midae SY9 : an enteric bacterium from the abalone Haliotis midae
… isolated from a wide range of sources including marine invertebrates and marine bacteria, which often produce more than one alginate lyase enzyme. Haliotis midae is the commercially important abalone species found along the South African coast. Over-fishing and poaching of this species has led to …
-
Shaping Function Through Space: The Role of Spatial Organization in Microbial Communities
… examine the colonization of chitin particles by marine bacteria, a model for particulate organic matter degradation. Using high-throughput phenotyping of natural isolates, we show that vitamin cross-feeding is essential for successful colonization of chitin-particles by many auxotrophic strains. …
-
Ecology, diversity and comparative genomics of oceanic cyanobacterial viruses
The marine cyanobacteria Prochlorococcus and Synechococcus are numerically dominant primary producers in the oceans. Each genera consists of multiple physiologically and genetically distinct groups (termed "ecotypes" in Prochlorococcus). Cyanobacterial viruses (cyanophages) that infect …
-
Structural characterization and bacterial degradation of marine carbohydrates
… of carbohydrate degradation by anaerobic marine bacteria. Polysaccharides produced by five species of marine plankton, Dunaliella tertiolecta, Emiliania huxleyi, Stephanopixis palmeri, a Phaeocystis sp., and Synechococcus WH7335, were surveyed using one- and two-dimensional nuclear …
-
Photosensing with LOV: Molecular Insights into the Shared Mechanism of Light-Regulated Kinase Signaling between Plant Phototropins and Bacterial Two-Component Systems
… LOV domains light–regulated histidine kinases in marine bacteria. Though the plant and bacterial kinases have diverse protein folds and functions, they both share the common photosensing module. Using a combination of biophysical and biochemical techniques, I examined the properties of these light …
-
Micro-scale interactions between chemotactic bacteria and algae
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 …
-
Iron limitation and the role of Siderophores in marine Synechococcus
Marine cyanobacteria in the genus Synechococcus are widely distributed and contribute significantly to global primary productivity. In many parts of the ocean their growth is limited by a lack of iron, an essential nutrient that is virtually insoluble in seawater. To overcome this, Synechococcus …
Page 1 of 3