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Additional resources for Biomembranes - Part H: Visual Pigments and Purple Membranes - I
Sample text
1. The chamber was placed in the sampIe compartment of a dual-wavelength spectrophotometer as clos ble to the 50-mm diameter end window of the ~hotomultiplier. stant reference wavelength was 720 nm. The absorption spect unbleached preparation is clearly dominated by rbodopsin, but some aspects from the spectrum of a pure rhodopsin solution. spectrum of the retina is distorted by scattering. The effect is se shift of both the absorbance maximum of the main band (from 496 nm) and of the p-band (from 350 to about 320 nm).
Their morphology resembles a single cone and a double cone except for their larger outer segment. H o w e v e r , the visual pigment they contain proved to be rhodopsin. 4° Therefore, Walls made an assumption that the receptor cells in this animal have been changed to rods from cones by mutation. 41 Nucleus Nuclei o f cone visual cells usually are located close to the outer limiting layer of the retina, and occasionally protrude into the basal portion o f the myoid. T h e y are spherical and larger in size and paler in their chromatin distribution than those of rod visual cells.
The isolated retina behaves like an assemblage of photoreceptor outer segments with a somewhat imperfect alignment of the individual cells. This requires a careful interpretation of the measured absorbance changes. If a difference spectrum is derived from the data of Fig. 2, the maximum loss is at 502 nm while the maximum gain is at 330 nm, which means that, in the bleached preparation, most of the original rhodopsin is present as retinol. The retinol peak, however, is unexpectedly low if one remembers that the maximum extinction coefficient of retinol is higher than that of rhodopsin.