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AN IMPROVED CATHODE FOR THE MEASUREMENT OF PHOTOSYNTHETIC OXYGEN EVOLUTION BY ISOLATED CHLOROPLASTS

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Summary

The construction, operation and calibration of an improved form of a Clark oxygen electrode are described in detail. The electrode shows a rapid response (1–5 seconds) to change in oxygen concentration and is capable of measuring rates of oxygen evolution (or uptake) of up to 4 μmoles oxygen per minute. The use of a pair of electrodes to measure the oxygen evolution of choloroplasts at high intensity of illumination is described.

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