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Light energy conservation processes in Halobacterium halobium cellsProton pumping driven by light or by respiration generates an electrochemical potential difference across the membrane in Halobacterium halobium. The pH changes induced by light or by respiration in cell suspensions are complicated by proton flows associated with the functioning of the cellular energy transducers. A proton-per-ATP ratio of about 3 is calculated from simultaneous measurements of phosphorylation and the proton inflow. This value is compatible with the chemiosmotic coupling hypothesis. The time course of the light-induced changes in membrane potential indicates that light-driven pumping increases a dark pre-existing potential of about 130 mV only by a small amount (20 to 30 mV). The complex kinetic features of the membrane potential changes do not closely follow those of the pH changes, which suggests that flows of ions other than protons are involved. A qualitative model consistent with the available data is presented.
Document ID
19770056060
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bogomolni, R. A.
(NASA Ames Research Center Moffett Field; California, University, San Francisco, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
May 1, 1977
Subject Category
Life Sciences (General)
Accession Number
77A38912
Funding Number(s)
CONTRACT_GRANT: NSG-7151
Distribution Limits
Public
Copyright
Other

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