חיפוש מתקדם
European Journal of Biochemistry
BEN Hayyim, G., Biochemistry Department, Weizmann Institute of Science, P. O. Box 26, Rehovot, Israel
Avron, M., Biochemistry Department, Weizmann Institute of Science, P. O. Box 26, Rehovot, Israel
Cytochrome composition and light‐induced absorbance changes of cytochromes b and f in isolated chloroplasts have been measured in the α‐band region utilizing dual‐wavelength spectrophotometry. Three cytochromes appeared in reduced minus oxidized spectra, whereas only two of them, namely, cytochrome f and a cytochrome b appeared in light‐induced difference spectra. Light‐induced changes of cytochrome b and cytochrome f, indicated that both are located in the part of the electron transport chain joining the two photosystems. The following sequence is supported by the evidence presented: Photosystem 2 → cytochrome b→ cytochrome f→ photosystem 1. 3‐(3,4‐Dichlorophenyl)‐1,1‐dimethyl urea was found to act in the region between photosystem 2 and cytochrome b since the photoinduced oxidation of both cytochromes but not of their reduction were observed in its presence. A site for ATP formation is suggested to be localized in the same region, since in the light the presence of uncouplers or photophosphorylating reagents induced a more reduced steady‐state of both cytochromes. Copyright © 1970, Wiley Blackwell. All rights reserved
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הספר "אוצר וולקני"
אודות
תנאי שימוש
Cytochrome b of Isolated Chloroplasts
14
BEN Hayyim, G., Biochemistry Department, Weizmann Institute of Science, P. O. Box 26, Rehovot, Israel
Avron, M., Biochemistry Department, Weizmann Institute of Science, P. O. Box 26, Rehovot, Israel
Cytochrome b of Isolated Chloroplasts
Cytochrome composition and light‐induced absorbance changes of cytochromes b and f in isolated chloroplasts have been measured in the α‐band region utilizing dual‐wavelength spectrophotometry. Three cytochromes appeared in reduced minus oxidized spectra, whereas only two of them, namely, cytochrome f and a cytochrome b appeared in light‐induced difference spectra. Light‐induced changes of cytochrome b and cytochrome f, indicated that both are located in the part of the electron transport chain joining the two photosystems. The following sequence is supported by the evidence presented: Photosystem 2 → cytochrome b→ cytochrome f→ photosystem 1. 3‐(3,4‐Dichlorophenyl)‐1,1‐dimethyl urea was found to act in the region between photosystem 2 and cytochrome b since the photoinduced oxidation of both cytochromes but not of their reduction were observed in its presence. A site for ATP formation is suggested to be localized in the same region, since in the light the presence of uncouplers or photophosphorylating reagents induced a more reduced steady‐state of both cytochromes. Copyright © 1970, Wiley Blackwell. All rights reserved
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