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Proton gradients in intact cyanobacteriaThe internal pH values of two unicellular cyanobacterial strains were determined with electron spin resonance probes, over an external pH range of 6 to 9, in the light and in the dark. The slow growing, thylakoid-lacking Gloeobacter violaceus was found to have a low capacity for maintaining a constant internal pH. The distribution pattern of weak acid and amine nitroxide spin probes across the cell membranes of this organism, in the light and in the dark, was consistent with the assumption that it contains a single intracellular compartment. At an external pH of 7.0, intracellular pH was 6.8 in the dark and 7.2 in the light. The cells of Agmenellum quadruplicatum, a marine species, were found to contain two separate compartments; in the dark, the pH of the cytoplasmic and the intrathylakoid spaces were calculated to be 7.2 and 5.5, respectively. Upon illumination, the former increased and the latter decreased by about 0.5 pH units.
Document ID
20040089646
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Belkin, S.
(University of California Berkeley 94720, United States)
Mehlhorn, R. J.
Packer, L.
Date Acquired
August 21, 2013
Publication Date
January 1, 1987
Publication Information
Publication: Plant physiology
Volume: 84
ISSN: 0032-0889
Subject Category
Man/System Technology And Life Support
Funding Number(s)
CONTRACT_GRANT: DE-ATO380-ER10637
CONTRACT_GRANT: AG-04818
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Program CELSS
NASA Discipline Life Support Systems
NASA Discipline Number 61-10

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