Activation of co-insensitive respiration in echiuroid eggs by light irradiation at various wavelengths

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Abstract 1. 1. The respiratory rate of echiuroid eggs in the presence of CO was slightly lower than in its absence and became markedly high by light irradiation at all examined wavelengths between 350 and 650 nm. 2. 2. The action spectrum for photo-activation of respiration in the presence of CO exhibited peaks of activating effect of light at 430, 530 and 570 nm. 3. 3. The similarity of this action spectrum to the absorption spectrum of reduced cytochrome b suggests that photo-activation of CO-insensitive respiration results from conversion of inactive cytochrome b to active form by its photon energy absorption.

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