Herbert J.G. Dartnall

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1. Microspectrophotometric measurements have been made of the photopigments of individual rods and cones from the retina of a man. The measuring beam was passed transversely through the isolated outer segments. 2. The mean absorbance spectrum for rods (n = 11) had a peak at 497.6 +/- 3.3 nm and the mean transverse absorbance was 0.035 +/- 0.007. 3. Three(More)
The material for this work was obtained from seven eyes removed because of malignant growths. Foveal and parafoveal samples of the retinas were taken and transverse measurements were made of the absorbance spectra of the outer segments of the rods and cones, using a Liebman microspectrophotometer. Four kinds of spectra were obtained with absorbance peaks at(More)
1. New microspectrophotometric measurements have been made of the photo-pigments of individual rods and cones from the retina of the rhesus monkey (Macaca mulatta). The measuring beam was passed transversely through isolated outer segments. 2. The transverse absorbance for rods ranged from 0.02 to 0.04 and that for cones from 0.01 to 0.03. 3. The mean(More)
1. Microspectrophotometric measurements reveal four classes of photoreceptor in the retina of the cynomolgus monkey, Macaca fascicularis, which is known to possess colour vision similar to that of a normal human trichromat. 2. Although the eyes were removed in bright illumination, the densities of pigment were comparable to those we have measured in(More)
Microspectrophotometric examination of individual rods, and partial bleaching of visual pigment extracts from three species of deep-sea fish,Aristostomias grimaldii, Malacosteus niger andPachystomias microdon, suggest the presence of a rhodopsin-porphyropsin system of paired pigments.Aristostomias andMalacosteus have a P5522-P5171 pair, whilePachystomias(More)