Showing papers by "Todd Sowers published in 2007"
TL;DR: In this article, the ability of Nitrosomonas cryotolerans cells to produce N 2 O at subfreezing temperatures was examined and it was shown that these frozen cultures produce N O at temperatures as low as −32°C.
Abstract: It was suggested that the abnormally high N 2 O values found in 130,000–160,000 year-old Vostok ice core samples, characterized by high δ 15 N and low δ 18 O values, resulted from in situ microbial N 2 O production. To substantiate these observations we obtained new geochemical data from the last glacial period and showed the existence of additional small N 2 O anomalies. To test the hypothesis that microbial metabolism could contribute to these anomalies, we developed protocols for examining the ability of Nitrosomonas cryotolerans cells to produce N 2 O at subfreezing temperatures. Our results show that these model, frozen cultures produce N 2 O at temperatures as low as −32°C.
43 citations