Mechanisms of sublethal copper toxicity damage to the photosynthetic apparatus of Rhodospirillum rubrum
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چکیده
منابع مشابه
The Photosynthetic Apparatus of Rhodospirillum Molischianum
By varying the light intensity and temperature during growth it is possible to obtain cultures of Rhodospirillum molischianum in which the specific bacteriochlorophyll contents differ by as much as fivefold. We used such cultures to compare the changes in the electron microscopic appearance of the cells with the changes in the amount and bacteriochlorophyll content of chromatophore material iso...
متن کاملSubcellular Particulate Systems and the Photochemical Apparatus of Rhodospirillum Rubrum.
The photoactive pigments of the photosynthetic bacteria are believed to be localized in small spherical bodies called chromatophores.1 Biochemical studies2 have shown that chromatophore preparations catalyze a variety of light-dependent reactions (e.g., photophosphorylation of adenosine diphosphate) and they are, therefore, frequently considered to represent the functional equivalent of green p...
متن کاملDevelopment and growth of photosynthetic membranes of Rhodospirillum rubrum.
In cell-free extracts from low-aeration suspensions of Rhodospirillum rubrum strain G-9, bacteriochlorophyll a was distributed in two bands after rate-zone sedimentation in sucrose density gradients. From the physicochemical properties of these fractions, it was concluded that the upper band consisted of small membrane fragments, whereas the major band was composed of fragmented vesicular intra...
متن کاملInfluence of cyclic AMP on photosynthetic development in Rhodospirillum rubrum.
During O2-free growth in the light and in medium with pyruvate, Rhodospirillum rubrum exhibits diauxic growth. The cells first fermented pyruvate and afterwards photometabolized. Exogenous cyclic AMP acted to prolong the lag period between fermentative and photosynthetic development, as well as to slow the light-dependent growth rate. This observation, and in situ changes in the cyclic AMP leve...
متن کاملThe Structure of Rhodospirillum rubrum
Cells from serial cultures of R. rubrum, grown anaerobically in the light, were harvested at intervals from (1/2) to 15 days and sectioned for electron microscopy by conventional methods. Cells of this species possess a multilayered outer envelope, and the external cell surface is differentiated into ridges extending parallel or obliquely to the long axis of the cell. Cells from very young cult...
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ژورنال
عنوان ژورنال: Biochimica et Biophysica Acta (BBA) - Bioenergetics
سال: 2019
ISSN: 0005-2728
DOI: 10.1016/j.bbabio.2019.06.004