"The specific aims of the project are (1) the analysis of the poly unsaturated fatty acid (PUFA) composition within pennate marine and lacustrine diatoms using a gas chromatograph mass spectrometer (GC-MS); (2) assessing intraspecific variation in PUFA composition; (3) the study of changes in PUFA production and composition under light, nutrient and salinity stress using ecophysiological experiments."