Abstract:
:Novel strains of obligately chemolithoautotrophic, sulfur-oxidizing bacteria have been isolated from various depths of Lake Fryxell, Antarctica. Physiological, morphological, and phylogenetic analyses showed these strains to be related to mesophilic Thiobacillus species, such as T. thioparus. However, the psychrotolerant Antarctic isolates showed an adaptation to cold temperatures and thus should be active in the nearly freezing waters of the lake. Enumeration by most-probable-number analysis in an oxic, thiosulfate-containing medium revealed that the sulfur-oxidizing chemolithotroph population peaks precisely at the oxycline (9.5 m), although viable cells exist well into the anoxic, sulfidic waters of the lake. The sulfur-oxidizing bacteria described here likely play a key role in the biogeochemical cycling of carbon and sulfur in Lake Fryxell.
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
Sattley WM,Madigan MTdoi
10.1128/AEM.00702-06subject
Has Abstractpub_date
2006-08-01 00:00:00pages
5562-8issue
8eissn
0099-2240issn
1098-5336pii
72/8/5562journal_volume
72pub_type
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