![]() ![]() ![]() An important aspect of my work is to determine the imprints associated with biological N transformations, by growing mono-cultures of model micro-organisms to elucidate the physiological mechanisms underlying N and O isotope fractionation, and to determine the variability in the isotopic imprints and the sensitivity of the latter to various growth conditions. I ndividual biological N transformations in the N cycle show characteristic patterns in fractionation of the stable isotopes of N species, thus leaving an imprint on specific N pools. To evaluate N dynamics in the environment from the natural abundance ratios 15 N/ 14 N ratios of fixed N species. I focus primarily on nitrogen cycling in marine systems, given the importance of N to ocean fertility, and also because N is the only plant nutrient whose biogeochemical cycling is effectuated entirely by biological processes. I am interested in elucidating how physiological processes occurring on a microbial scale shape environmental processes on regional to global scales. ![]()
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