Download Advances in Botanical Research, Vol. 10 by H. W. Woolhouse PDF

By H. W. Woolhouse

ISBN-10: 012005910X

ISBN-13: 9780120059102

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In purple bacteria the chromatophore membranes are extensions of the plasma membrane. , 1975). Chromatophores may form small vesicles attached to the plasma membrane, or long sacs extending from the plasma membrane, or they may form stacks of lamellae with no obvious connection with the plasma membrane. However in all cases the structure is vesicular, that is a membrane divides off an inside compartment (which, theoretically, should be connected to the outside of the organism) and an outside compartment, the cytoplasm.

10. The proton gradient is generated by the release of protons by water-splitting on the inner side of the thylakoid membrane and by the translocation of protons to the intrathylakoid space by reduced plastoquinone. The energy for the generation of the proton gradient Fig. 10. A model of the arrangement of components of the thylakoid membrane (nonappressed). ) (strictly an electrochemical gradient for protons involving both a pH difference and an electrical potential difference) comes from the charge separation generated by the photochemical conversions of P-700 and P-680.

16. The relationship of absorbance (a) and absorptance (per cent absorption) (b) to pigment concentration in an isotropic system. LIGHT HARVESTING PROCESSES IN ALGAE 45 or absorbance are plotted against pigment concentration for an ideal isotropic system. At low concentrations of pigment both per cent absorption or absorptance are nearly directly proportional to concentration but at high concentration, while absorbance is still directly proportional to pigment concentration, per cent absorption approaches an asymptote (Fig.

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