. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 66 GARY N. CALKINS. MEASUREMENTS OF 10 INDIVIDUALS EACH, IN MICRONS. Normal. Exposure to ultra-violet rays. Actively Dividing. Vegetative. 10 Min. After. 24 Hours After. 48 Hours After. Leng. Diam. Leng. Diam. Leng. Diam. Leng. Diam. Leng. Diam. 180 20 143 15 132 13 no 16 IOO 12 112 26 ISO 16 150 12 in 16 90 IS I IO 25 170 17 145 10 90 14 105 13 123 24 192 19 145 14 82 13 112 12 120 19 195 20 ill 10 93 14 IOO U 116 22 1 60 20 142 12 69 20 no IO 117 23 142 20 148 IO 75 13 112 16 129 2? 160 20 I IO II 85 14 103 14 120 13
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 66 GARY N. CALKINS. MEASUREMENTS OF 10 INDIVIDUALS EACH, IN MICRONS. Normal. Exposure to ultra-violet rays. Actively Dividing. Vegetative. 10 Min. After. 24 Hours After. 48 Hours After. Leng. Diam. Leng. Diam. Leng. Diam. Leng. Diam. Leng. Diam. 180 20 143 15 132 13 no 16 IOO 12 112 26 ISO 16 150 12 in 16 90 IS I IO 25 170 17 145 10 90 14 105 13 123 24 192 19 145 14 82 13 112 12 120 19 195 20 ill 10 93 14 IOO U 116 22 1 60 20 142 12 69 20 no IO 117 23 142 20 148 IO 75 13 112 16 129 2? 160 20 I IO II 85 14 103 14 120 13 22 130 15 98 12 96 18 116 26 170 18 122 9 78 13 IOO 17 Average 133-5 1 14-5 It is evident that one well-marked effect of the ultra-violet rays is a great reduction in size of the organism. This is manifested immediately after radiation as shown by the difference in average size of ten individuals taken at random, from x to x 11-6. The decrease in size continues until at the end of twenty-four hours the average size is only ^. Ap- parently a first effect, therefore is the loss of cell fluids, but there is a partial recovery during the second twenty-four hours, for the average size goes up to ^. The organisms however are doomed for by the end of sixty hours after exposure they are all dead. Immediately after exposure they are active and apparently FIG. 3. Urolcf>tus Halscyi. Killed ten minutes after treatment with ultra- violet rays for 30 seconds. X 775- Other effects of radiation are shown by the intra-cellular struc- tures. The structures which we interpret as mitochondria are. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Ma
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
