. Bacterial photosynthesis. Bacteria -- Physiology; Photosynthesis. 310 ELECTRON TRANSPORT such changes precede certain electron transport processes in chroma- tophores. Data in Fig, 2 illustrate a typical of R. nib rum chromatophores for photo reduction with the aromatic disulfide 5,5- dithiobis-2-nitrobenzoic acid (DTNB) as a thiol-trapping system. The assays were performed using media of two different ionic strengths. Both preparations carry out the light-activated photo reduction at iden- tical rates, under anaerobic conditions, when the ascorbate-indophenol system is used as the e
. Bacterial photosynthesis. Bacteria -- Physiology; Photosynthesis. 310 ELECTRON TRANSPORT such changes precede certain electron transport processes in chroma- tophores. Data in Fig, 2 illustrate a typical of R. nib rum chromatophores for photo reduction with the aromatic disulfide 5,5- dithiobis-2-nitrobenzoic acid (DTNB) as a thiol-trapping system. The assays were performed using media of two different ionic strengths. Both preparations carry out the light-activated photo reduction at iden- tical rates, under anaerobic conditions, when the ascorbate-indophenol system is used as the electron donor and methyl viologen as catalyst. However, preparations in media of low ionic strength invariably dis- play induction periods in photochemical activity, which is eliminated by salts. Induction is freely reversible and demonstrable with a large variety of di- and monovalent anions and cations; it is an effect of ionic strength on the particles. That elimination of the induction period is not solely the result of a general solute or osmotic process is indicated, because neither sucrose, urea, nor alcohols at relatively high concentration eliminate induction. In fact, nonionic solutes extend Tetrazolium Photoreduction - E Na-P04 /i= y /7 = + Acetone^. ^ /i=^o^§:r^' 4 6 8 10 Time, Minutes 12 14 Fig, 3, The effect of acetone on photoreduction of tetrazolium blue by R. r^fin/m chromatophores in media of high ionic strength, Ascorbate-indophenol system is the electron Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Symposium on Bacterial Photosynthesis (1963 : Yellow Springs, Ohio); Charles F. Kettering Research Laboratory (Yellow Springs, Ohio); Gest, Howard. Yellow Springs, Ohio, Antioch Press
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