. Ciba Foundation conferences on istopes in biochemistry;. Radioactive tracers in biochemistry; Isotopes -- Physiological effect. 98 HOLLAENDER, StAPLETON AND BuRNETT this point (Giles and Riley, 1950) that there is an increased response to X-rays with increasing concentration up to the percentage of oxygen in air. Further increase of oxygen has. 40 60 80 100 X-RAY DOSE IN KILOROENTGENS 120 Fig. 1. Comparative sensitivity of aerobic and anaerobic cells irradiated in high and low oxygen-tensions. Curve B. Aerobic broth cells irradiated in oxygen-saturated buffer. Curve B^. Aerobic broth cells i
. Ciba Foundation conferences on istopes in biochemistry;. Radioactive tracers in biochemistry; Isotopes -- Physiological effect. 98 HOLLAENDER, StAPLETON AND BuRNETT this point (Giles and Riley, 1950) that there is an increased response to X-rays with increasing concentration up to the percentage of oxygen in air. Further increase of oxygen has. 40 60 80 100 X-RAY DOSE IN KILOROENTGENS 120 Fig. 1. Comparative sensitivity of aerobic and anaerobic cells irradiated in high and low oxygen-tensions. Curve B. Aerobic broth cells irradiated in oxygen-saturated buffer. Curve B^. Aerobic broth cells irradiated in nitrogen-saturated buffer. Curve GB. Anaerobic glucose cells irradiated in oxygen- saturated buffer. Curve GB^. Anaerobic glucose cells irradiated in nitrogen- saturated bujffer. Hollaender, Stapleton and Martin (1951), Nature, 167, 103. relatively little effect. The finding that 21 per cent oxygen is the limiting concentration for the cells studied suggests that this is a characteristic which may have been brought. 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 Ciba Foundation. Philadelphia, Blakiston
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