Microbial Carbon Sources on the Shelf and Slope of the Northwestern Gulf of Mexico. (August 2005) Carlton David Rauschenberg, B.S., DePaul University Chair of Advisory Committee: Dr. Luis A. Cifuentes Over the past five years, gas chromatography/combustion/isotope ratio mass spectrometry (GC/C/IRMS) analyses of phospholipid fatty acids (PLFAs) has been increasingly used to link organic matter (...