Recording Oxidation-reduction Potentials in Plant Preparations.

Abstract
A simple, battery-operated, impedance matching circuit for connecting a platinum-calomel electrode system to a Brown recorder for use in recording oxidation-reduction potentials from biological systems is descr. Application to the study of the Hill reaction (photolysis of water by isolated chloroplasts) is discussed. Reaction cells and modified Warburg vessels for making potentiometric measurements on photosynthetic systems are discussed.