Abstract
Light-induced proton efflux has been investigated with intact cells of Anabaena, Nostoc, Anacystis, and Aphanocapsa. The proton efflux by filamentous blue-green algae is biphasic, strongly inhibited by ortho-vanadate and insensitive to cyanide. These data are taken as evidence for a proton-pumping ATP-hydrolase present on the cytoplasmic membrane of Anabaena and Nostoc.
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