New PDF release: Current Topics in Bioenergetics

By D R ed Sanadi

ISBN-10: 1483199703

ISBN-13: 9781483199702

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Light-Induced Proton Transport in Chloroplasts . . + A. Inhibition of H Uptake + B. Stoichiometry of H Uptake VI. Correlation of Light-Induced Proton Transport with Ultrastructural Changes in Chloroplasts A. Apparent Inhibition of Proton Transport in the Presence of W e a k Acid Anions B. Organic Anion Transport and the Mechanism of LightInduced Shrinkage of Chloroplasts C. Proton Movements in Chloroplasts Suspended in W e a k Acid Anions D. Relation between p K a of Anion and Rate of Scattering Change VII.

CROFTS ammonium acetate had a much larger volume than those suspended in ammonium chloride at equivalent concentrations as confirmed by packed volume measurements and electron microscopy. Chloroplasts were found to swell rapidly in the dark in solutions of a variety of weak acid anions and the rate of swelling could be related to the concentration of undissociated acid present, as judged by the pK a's of the anions used (see Fig. 2 ) . Swelling or lysis in salt solutions is indicative of penetration of the osmotically effective membrane by both cationic and anionic species of the suspending medium.

Variation of potassium ion content with these parameters suggested that the ion was fairly readily lost from chloroplasts. Tolberg and Macey (1965), on the basis of the distribution of potassium, sodium, and chloride ions between the medium and chloroplasts, have recently suggested that sodium and chloride ions equilibrate rapidly between all aqueous phases, whereas potassium ions may be partially retained. Saltman et al. (1963) have studied the efflux and uptake of isotopically labeled monovalent cations and anions in Nitella chloroplasts.

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Current Topics in Bioenergetics by D R ed Sanadi

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