In support of research in the laboratory of Senior Investigator Dr. Stephen J. Giovannoni on the dynamics of a key group of marine planktonic microorganisms that require external sources of carbon for food and energy. This abundant, ecologically important group of bacteria will be studied with respect to its composition, gene and protein expression patterns, genome content, and nutritional requirements. The outcomes of this grant include a deeper understanding of how populations of these bacteria change in space and time in natural marine systems, how they have evolved to cope with low nutrient levels, and how this ubiquitous and numerically predominant group impacts marine biogeochemical cycles.
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