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Isotope effects associated with the anaerobic oxidation of sulfite and thiosulfate by the photosynthetic bacterium, Chromatium vinosumThe purple photosynthetic bacterium Chromatium vinosum, strain D, catalyzes several oxidations of reduced sulfur compounds under anaerobic conditions in the light: e.g., sulfide --> sulfur --> sulfate, sulfite --> sulfate, and thiosulfate --> sulfur + sulfate. Here it is shown that no sulfur isotope effect is associated with the last of these processes; isotopic compositions of the sulfur and sulfate produced can differ, however, if the sulfane and sulfonate positions within the thiosulfate have different isotopic compositions. In the second process, an observed change from an inverse to a normal isotope effect during oxidation of sulfite may indicate the operation of 2 enzymatic pathways. In contrast to heterotrophic anaerobic reduction of oxidized sulfur compounds, anaerobic oxidations of inorganic sulfur compounds by photosynthetic bacteria are characterized by relatively small isotope effects.
Document ID
20040089357
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Fry, B.
(Indiana University Bloomington 47405, United States)
Gest, H.
Hayes, J. M.
Date Acquired
August 21, 2013
Publication Date
January 1, 1985
Publication Information
Publication: FEMS microbiology letters
Volume: 27
ISSN: 0378-1097
Subject Category
Exobiology
Funding Number(s)
CONTRACT_GRANT: NGR15003-118
CONTRACT_GRANT: PCM-84-04996
CONTRACT_GRANT: PCM-7910747
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Discipline Exobiology

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