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Electron Transport in Chloroplasts

II. EFFECT OF HYDROCARBON SOLVENT EXTRACTION ON CHLOROPLAST MEMBRANE STRUCTURE

From the ¹ From the Department of Biological Sciences, Purdue University, Lafayette, Indiana 47907

Heptane extraction and heptane extraction followed by petroleum ether extraction remove up to 93% of plastoquinones A and C from spinach chloroplasts, while removing less than 1% of the chlorophyll. Only minor modification of chloroplast membrane structure is observed after extraction. Osmium-fixed and sectioned chloroplasts show darker staining and thinner cross section after extraction. The surface of the membranes shows fewer globular structures when negatively stained with phosphotungstate.

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