ISSN:
1432-072X
Keywords:
Membrane differentiation
;
Buoyant density
;
Photosynthetic units
;
Bacteriochlorophyll, emission, absorption
;
Phospholipids
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Aerobically in the dark grown cultures of Rhodopseudomonas capsulata were shifted to low oxygen partial pressure for 30 min and afterwards to phototrophic conditions (anaerobic, light). During 210 min of adaptation to a phototrophic mode of life the bacteriochlorophyll (BChl) concentration increased 53-fold (doubling time 40 min) and the carotenoid content six fold. Growth was delayed. The light membrane fraction from chemotrophic and induced phototrophic cells contained low concentrations of small photosynthetic units (reaction center+light harvesting BChl B870), and low respiratory activities, especially of succinatecytochrome c oxidase. The heavy membrane fraction, i.e. the intracytoplasmic chromatophore fraction, increased during adaptation approximately 9-fold in surface area per cell, 42-fold in BChl content, 7-fold in reaction center content and 6-fold in the size of the photosynthetic unit. Phospholipid and fatty acid content and patterns changed slightly during adaptation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00411178
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