Fractionation of nitrogen isotopes during amino acid metabolism in heterotrophic and chemolithoautotrophic microbes across Eukarya, Bacteria, and Archaea: Effects of nitrogen sources and metabolic pathways
Yasuhiko T. Yamaguchi, Yoshito Chikaraishi, Yoshinori Takano, Nanako O. Ogawa, Hiroyuki Imachi, Yusuke Yokoyama, Naohiko Ohkouchi
Organic Geochemistry
http://www.sciencedirect.com/science/article/pii/S0146638017302516
Must read to understand how d15N_AA can be shaped.
