Rhythmicity of chromophore turnover of visual pigment in the Antarctic amphipodOrchomene plebs(Crustacea; Amphipoda)
✍ Scribed by T. Hariyama; A. Terakita; V. B. Meyer-Rochow
- Publisher
- Springer
- Year
- 1993
- Tongue
- English
- Weight
- 485 KB
- Volume
- 173
- Category
- Article
- ISSN
- 0340-7594
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✦ Synopsis
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Relative retinal amounts in the compound eye of the Antarctic amphipod Orchomene plebs were assessed during conditions of continuous summer daylight every 3 h over a period of 48 h. The habitat of the experimental animal is the bottom of the Ross Sea (78~ 166~ down to depths of at least 400 m; water temperature is a constant -1.8 ~ C. A periodicity of 12 h was detected with relative amounts of 11-cis retinal exhibiting peaks at midday and at midnight and troughs at 7.00 h and 19.00 h.
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The result that 90% of retinoid were insoluble in n-hexane suggests that at least 90% of the measured retinoid were attached to membrane-bound proteins such as opsin.
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Selective light adaptation showed that the visual pigments were thermostable and photoregenerable. The main absorbance peak of rhodopsin, compared with metarhodopsin, seems to be in the longer wavelengths.