Production of N2O by Ammonia Oxidizing Bacteria at Subfreezing Temperatures as a Model for Assessing the N2O Anomalies in the Vostok Ice Core

Autor:	Vanya Miteva, Todd Sowers, Jean E. Brenchley
Rok vydání:	2007
Předmět:	In situ Stable isotope ratio Chemistry Microbial metabolism Mineralogy Ammonia-oxidizing bacteria Microbiology Ice core Environmental chemistry Earth and Planetary Sciences (miscellaneous) Environmental Chemistry Glacial period Nitrosomonas cryotolerans General Environmental Science
Zdroj:	Geomicrobiology Journal. 24:451-459
ISSN:	1521-0529 0149-0451
DOI:	10.1080/01490450701437693
Popis:	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.
Databáze:	OpenAIRE
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