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Photosynthesis Without the Organisms: The Bacterial Chromatophores
2017Anoxygenic photosynthetic bacteria are an extremely old form of life that inhabits planet Earth since approximately 3 Gya. They represent the model system for the far more complex photosynthetic organisms appeared later in time, i.e. cyanobacteria, algae and plants, and capable of performing the oxygenic photosynthesis.
Altamura Emiliano +3 more
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Picosecond differential absorption spectroscopy of photosynthetic bacterial chromatophores
Soviet Journal of Quantum Electronics, 1985An analysis was made of the data obtained on chromatophores of photosynthetic bacteria by picosecond laser spectroscopy. The conflicts between the results of fluorescence and absorption measurements can be resolved if an allowance is made for the absorption of light by excited states of bacteriochlorophyll as well as for singlet–singlet annihilation.
L Valkunas, Sh Kudzhmauskas, G Trinkunas
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The Determination of the Electrochemical Potential Difference of Protons in Bacterial Chromatophores
1985In cells and in subcellular vesicles, a thermodynamic description of the energy-driven metabolic reactions is based on the evaluation of the free energy change which results from the vectorial proton movements across the coupling membrane. According to the chemiosmotic hypothesis for energy coupling introduced by P.Mitchell(1), the bulk to bulk phase ...
Rita Casadio +2 more
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Biochimica et Biophysica Acta (BBA) - Bioenergetics, 1986
Abstract At the onset of continuous illumination of chromatophores from Rhodopseudomonas capsulata there is a burst of H+-disappearance from the external medium, lasting about 100 ms, which coincides with the period of membrane potential (Δψ) development. Three ‘backlash’ factors contribute to the burst.
J.F. Myatt, J.B. Jackson
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Abstract At the onset of continuous illumination of chromatophores from Rhodopseudomonas capsulata there is a burst of H+-disappearance from the external medium, lasting about 100 ms, which coincides with the period of membrane potential (Δψ) development. Three ‘backlash’ factors contribute to the burst.
J.F. Myatt, J.B. Jackson
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Correlation Between Buffering Capacity and Proton Efflux in Bacterial Chromatophores
1990The total amount of protons stored in the chromatophore vesicles after a period of illumination is related to the ΔpH and to the buffering capacity of the vesicle interior. The decay kinetics in the dark of the established proton gradient depend on the membrane permeability for protons and on the concentration and proton affinity of the internal ...
Turina, M. P. +2 more
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Archives of Biochemistry and Biophysics, 1985
The spectral characteristics of absorption and fluorescence emission of 9-amino acridine are not altered by the interaction with bacterial chromatophores, except for the attenuation of both the absorption and emission following the formation of a protonic gradient.
R, Casadio, B A, Melandri
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The spectral characteristics of absorption and fluorescence emission of 9-amino acridine are not altered by the interaction with bacterial chromatophores, except for the attenuation of both the absorption and emission following the formation of a protonic gradient.
R, Casadio, B A, Melandri
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Photochemistry and Photobiology, 1962
SummaryWashed or air‐dried chromatophores of photosynthetic bacteria show a reversible light‐induced bleaching and red shift of the absorption bands of carotenoids. This change is sensitized by light absorbed by bacteriochlorophyll (BChl). The carotenoid reaction is abolished by exposure to deoxycholate.
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SummaryWashed or air‐dried chromatophores of photosynthetic bacteria show a reversible light‐induced bleaching and red shift of the absorption bands of carotenoids. This change is sensitized by light absorbed by bacteriochlorophyll (BChl). The carotenoid reaction is abolished by exposure to deoxycholate.
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Biochimica et Biophysica Acta (BBA) - Bioenergetics, 1981
Abstract The orientation of the reaction center bacteriochlorophyll dimer, (BChl) 2 , and primary quinone, Q I , has been studied by EPR in chromatophores of Rhodopseudomonas sphaeroides R26 and Chromatium vinosum and in the reconstituted membrane multilayers of the isolated Rps. sphaeroides reaction center protein.
David M. Tiede, P.L. Dutton
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Abstract The orientation of the reaction center bacteriochlorophyll dimer, (BChl) 2 , and primary quinone, Q I , has been studied by EPR in chromatophores of Rhodopseudomonas sphaeroides R26 and Chromatium vinosum and in the reconstituted membrane multilayers of the isolated Rps. sphaeroides reaction center protein.
David M. Tiede, P.L. Dutton
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Biophysics, 2017
The mechanisms of the specific influence of dipyridamole therapy remain as a subject of research. In the present work the effects of dipyridamole and some its derivatives on the energization state of photosynthetic membranes of purple bacteria chromatophores have been studied.
P. P. Knox +4 more
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The mechanisms of the specific influence of dipyridamole therapy remain as a subject of research. In the present work the effects of dipyridamole and some its derivatives on the energization state of photosynthetic membranes of purple bacteria chromatophores have been studied.
P. P. Knox +4 more
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Biochimica et Biophysica Acta, 1962
By means of the flashing-light technique, it was shown that photochemical process and dark process can be separated in photophosphorylation ofR. rubrum chromatophores. The first is a rapid process which occurs only during illumination, and this reaction proceeds proportionally to the amount of light given during flash.
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By means of the flashing-light technique, it was shown that photochemical process and dark process can be separated in photophosphorylation ofR. rubrum chromatophores. The first is a rapid process which occurs only during illumination, and this reaction proceeds proportionally to the amount of light given during flash.
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