A Secondary Photosynthetic Carboxylation

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Abstract
The gas exchange and assimilatory quotient of leaves during the induc-tion period of photosynthesis have been measured in a study of the mechanism of the initial transient uptake of CO2. Data on the assimilatory quotient and the manner in which the initial gas exchange depends on the previous periods of light and darkness led to the postula-tion of the reductive carboxylation of pyruvate to malate via the TPN-linked malic enzyme as the initial transient carboxylation process.
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