Abstract

Abstract— Absorption spectra and spectra of the refractive indices were separately measured for cytoplasm and vacuole of Phycomyces blakesleeanus in the wavelengths domains 300 to 750 nm and 250 to 750 nm respectively. These data were then used to simulate absorption profiles for different orientations of the photoreceptor for measured action spectra for phototropic balance. The photoreceptor was assumed to be a flavin. Using the reference wavelengths 394, 450 and 507 nm as an example it is shown that the absorption profiles have, independent of the photoreceptor orientation, invariant properties. Under bilateral balancing illumination the symmetry of the absorption profiles is conserved and the total amount of energy absorbed at proximal and distal sides is an invariant under a symmetry transformation front to the rear side.

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