Microspectrophotometry of Photoreceptor Organelles from Eyes of the Prawn Palaemonetes

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Science  02 Aug 1968:
Vol. 161, Issue 3840, pp. 468-469
DOI: 10.1126/science.161.3840.468


Microspectrophotometric measurements of individual dark-adapted rhabdoms of the prawn Palaemonetes vulgaris reveal the presence of two light-sensitive pigments. A pigment with maximum absorbancy at 555 nanometers is converted by light to a long-lived intermediate with wavelength of maximum absorbancy at 496 nanometers. A second pigment with wavelength of maximum absorbancy at 496 nanometers bleaches in the light, seemingly without forming detectable products at wavelengths longer than 375 nanometers. Both pigments occur in each layer of microvilli.

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