Abstract
The reduction of one molecule of carbon dioxide per two thousand molecules of chlorophyll after each intense flash of light of very short duration, while three hundred or m ore are reduced when the duration of the flash is greatly increased, can be explained by assuming that chlorophyll sensitizes the activation of a substance
A
which, by handing on its energy, causes the reduction of carbon dioxide in combination with a substance
S
. The decay of activated
A
is a relatively rapid process while that of the activated compound of carbon dioxide and
S
is relatively slow. The yield for short flashes is determined by
A
, that for long flashes by
S
. The ratio of to
A
is of the order of 100.
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