By Nord F F (ed)
Advances in Enzymology and comparable components of Molecular Biology is a seminal sequence within the box of biochemistry, providing researchers entry to authoritative reports of the most recent discoveries in all components of enzymology and molecular biology. those landmark volumes date again to 1941, offering an unmatched view of the historic improvement of enzymology. The sequence deals researchers the most recent knowing of enzymes, their mechanisms, reactions and evolution, roles in advanced organic approach, and their program in either the laboratory and undefined. each one quantity within the sequence gains contributions via prime pioneers and investigators within the box from worldwide. All articles are rigorously edited to make sure thoroughness, caliber, and clarity.
With its wide variety of themes and lengthy historic pedigree, Advances in Enzymology and similar parts of Molecular Biology can be utilized not just by means of scholars and researchers in molecular biology, biochemistry, and enzymology, but additionally by way of any scientist attracted to the invention of an enzyme, its homes, and its functions.
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Extra info for Advances in Enzymology and Related Areas of Molecular Biology, Volume 30
Two einsteins of light reduced 1 equivalent of ferricyanide, in good agreement with the hypothesis that green light is absorbed equally by the two photosytems and that ferricyanide reduction is driven by light absorbed by photosystem 2 with a quantum yield of 1. The total pool of (Q P) was estimated as approximately 1 equivalent per 35 chl molecules (178). , the reoxidation of Q- and P- by far-red light (photosystem 1)-had a quantum yield of approximately 1. This supports the view that far-red light is absorbed by photosystem 1.
It was concluded that at least three cytochromes are localized in the chloroplast: cyt f , cyt ba, and a cytochrome (cyt 559, chloroplasts) with an a-band a t about 559 mp a t 20°C and 557 mp a t 77°K. The cytochromes were present in the approximate molar ratio of 1:2 :2. PHOTOCHEMICAL SYSTEMS OF PHOTOSYNTHESIS 49 It is assumed tentatively that cyt 559 is a b-type cytochrome. Cyt f and cyt 559 were in their reduced states in the isolated chloroplast, and cyt bs was oxidized. The various difference spectra obtained with the 144,OOOg fraction indicated that this fraction contained only cyt f and cyt b6, while a comparison of the low temperature difference spectra of the 10,OOOg fraction and the chloroplasts showed that the 10,OOOg fraction contained less cyt f and cyt bs and more cyt 559 than did the chloroplasts (34).
Further indirect evidence th at plastoquinone is probably essential for electron flow in photosystem 2 is provided by photoinhibition studies. It was observed that plastoquinone is partly destroyed by ultraviolet light (179,226,254) with a loss in Hill activity. Photoreduction of NADP+ with ascorbate-DCIP as electron donor was not affected (129,179). However, direct proof for the involvement of plastoquinone in ultraviolet photoinhibition is lacking, since inactivated chloroplasts could not be restored by the addition of plastoquinone.
Advances in Enzymology and Related Areas of Molecular Biology, Volume 30 by Nord F F (ed)