頭足類網膜の感光性色素

概要

論文の詳細を見る
The retina of the squid Ommastrephes contains two kinds of photosensitive pigment which we called pigment A and B each. Pigment A is found in rhabdomes as a rhodopsin, and pigment B is concentrated at the surface of the retina deprived completely of rhabdomes and a dense layer of black pigments. Pigment B is quite different from pigment A in photolytic behavior (Hara and Hara, 1965b). Although the pigment B content seems to vary with animal species, such a dual system of photosensitive pigment is widely observed in cephalopd retinas, as demonstrated below in Octopoda as well as in Decapoda. Pigment A and B solutions were prepared from isolated rhabdomes and the remaining retinal tissues of cephalopds, 1) Ommastrephes sloani pacificus, 2) Sepia esculenta, 3) Sepiella japonica and 4) Octopus vulgaris. They were examined by means of spectrophotometry: The absorption maxima of pigment A were at 480mμ, 486mμ, 500mμ and 475mμ, and those of pigment B were at 495mμ, 508mμ, 522mμ and 490mμ, respectively. In general, pigment B gives the maiximum absorption at about 20mμ longer wave-lengths than pigment A. Although pigment B is a chromoprotein which, like pigment A, contains retinal_1 as a chromophore, it is bleached by light more quickly than pigment A, showing two processes of bleaching similar to vertebrate rhodopsin. The change in electrical conductance is markedly revealed on illumination of pigment A, but scarcely observed on photolysis of pigment B. Pigment B seems to be involved with some relation to such a lamellated system of membranes in the proximal segment connecting rhabdome to the nucleated visual cell body as has been reported in the octopus retina. It may be a supplementary pigment for visual excitation of the eye, probably supplying active retinal for the rhabdomes.
社団法人日本動物学会の論文
1966-09-15

頭足類網膜の感光性色素

スポンサーリンク

概要

著者

関連論文

スポンサーリンク