Intramolecular isotopic evidence for bacterial oxidation of propane in subsurface natural gas reservoirs. - Gilbert, Alexis; Lollar, Barbara Sherwood; Musat, Florin; Giunta, Thomas; Songcan Chen; Yuki Kajimoto; Keita Yamada; Boreham, Christopher J.; Naohiro Yoshida; Yuichiro Ueno (Proceedings of the National Academy of Sciences of the United States of America, 2019)