. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RETINOMOTOR RHYTHMS IN THE GOLDFISH 203. FIGURE 3. Photomicrographs of radial sections showing retinas in different states of adaptation, (a) Light-adapted, 10 ^, H&E. (b) Noon dark-adapted after 17 hours in dark- ness, 10 n, H&E. (c) Midnight dark-adapted after 5 hours in darkness, pigment bleached; 5/x, ferric chloride and eosin. The bar in (b) represents 100/x. e = external limiting mem- brane, 1 = lamina basalis, s = single cones, and d — double cones. 450 X. The cones migrated through a cycle of positions during
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. RETINOMOTOR RHYTHMS IN THE GOLDFISH 203. FIGURE 3. Photomicrographs of radial sections showing retinas in different states of adaptation, (a) Light-adapted, 10 ^, H&E. (b) Noon dark-adapted after 17 hours in dark- ness, 10 n, H&E. (c) Midnight dark-adapted after 5 hours in darkness, pigment bleached; 5/x, ferric chloride and eosin. The bar in (b) represents 100/x. e = external limiting mem- brane, 1 = lamina basalis, s = single cones, and d — double cones. 450 X. The cones migrated through a cycle of positions during the course of the night, but in each group of fish they followed an irregular and unique course with maxi- mal extensions occurring at different times in the night. Between 2100 hr. and 0200 hr., the corresponding points of groups A and E almost always deviated in opposite directions. The plot of the mean within that interval was relatively smooth. Between 0200 hr. and 0500 the fluctuations in groups A and E followed parallel courses and both exhibited a prominent positive shift in the slope TABLE I Mean RP values of double cones during the first 24 houis in darkness, based upon radial sections. Sunset was at 2036 hr. and the expected sunrise was 0534 hr. Phis and minus values represent one standard deviation. The p values are based upon Student's t-test between successive time periods Groups Time Number of fish RP value P A, E, F 2100 5 ± 2200 6 ± > .05 2300 6 ± n. s. 2400 6 ± n. s. 0100 5 ± n. s. 0200 5 ± n. s. 0300 8 ± n. s. 0400 7 ± n. s. 0500 6 ± > .01 A only 0534 4 ± n. s. 0800 3 ± > .05 1100 3 ± n. s. 1300 4 ± n. s. 1500 4 ± n. s. 1800 4 ± n. s. 2037 4 ± n. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
