. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 54 E. S. GUZMAN BARRON, V. FLOOD, AND B. GASVODA TABLE II Inhibition of sea urchin sperm respiration by x-ray irradiated sea water. X-ray dose, 100,000 r. Liver catalase ( cc.) added immediately after irradiation; sperm suspension 5 minutes later O2 uptake Inhibition Experimental conditions (per cent) First hour Second hour () () Control X-ray irradiated sea water 38 X-ray irradiation + catalase 34 Loiseleur et al. (1941, 1942) and by Evans (1947), x-ray irradiation at a dose of 100
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 54 E. S. GUZMAN BARRON, V. FLOOD, AND B. GASVODA TABLE II Inhibition of sea urchin sperm respiration by x-ray irradiated sea water. X-ray dose, 100,000 r. Liver catalase ( cc.) added immediately after irradiation; sperm suspension 5 minutes later O2 uptake Inhibition Experimental conditions (per cent) First hour Second hour () () Control X-ray irradiated sea water 38 X-ray irradiation + catalase 34 Loiseleur et al. (1941, 1942) and by Evans (1947), x-ray irradiation at a dose of 1000 r would produce an increase in cell Barren et al. (1949) have shown that on the contrary, respiration is inhibited. It must be concluded from these experiments that the effects of x-ray irradiation on the metabolism of sea urchin sperm cannot be attributed to H2O2 formation. Effect of x-ray irradiated sea ^vater on the respiration of sea urchin sperm A number of investigators have reported that on irradiation of aqueous solutions, whether with x-rays or with ultra-violet light, there is formation of some unknown substance which will produce inhibition of growth of protozoa (Taylor et al., 1933), o UJ 60 40 20 OJ O. 30 60 90 TIME IN MINUTES 120 FIGURE 3. Inhibition of sea urchin sperm respiration by x-ray irradiated sea water. Irradiation, 200,000 r. 1. Sperm suspended in sea water; 2. Suspended in x-ray irradiated sea water. • inhibition of the fertilizing capacity of sea urchin sperm (Evans, 1947), inhibition of the growth of bacteria (Wyss et al., 1948), and increase in the mutation rate of v9. aureus to penicillin resistance (Stone et al., 1947). -When freshly filtered sea water was irradiated with 100,000 r, and a suspension of sperm was added to it soon 2 From Bonet-Maury and Frilley's data (1944) it can be calculated that 1000 r would pro- duce on irradiation of water about 1 X 10~5 M of H^ Please note that these images are extracted from scanned pag
Size: 1900px × 1314px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
