Expérience réalisée par le biochimiste anglais Robert Hill en 1937 et 1939. Il a montré que la réaction de photosynthèse pouvait être découplé en deux réactions couplés à un système d'oxydoréduction.
Hill réalise son expérience sur une suspension de chloroplastes et utilise, en absence de CO2, un réducteur artificiel : le ferricyanure de potassium.
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