. Biological effects of radiation; mechanism and measurement of radiation, applications in biology, photochemical reactions, effects of radiant energy on organisms and organic products. Radiation; Biology. ^^ 60 " 50 10 20 50 40 50 60 70 80 90100110120150140150160110180190200210220250240250260270 Time in MInu+es rradiation. Fig. 10 20 30 40 50 60 70 80 90 100110120150140150160110180190 200 Time in Minu+es -Effect of raying on the rate of respiration of etiolated pea seedlings. Masure, 11.) (After Popp and Brown claim that this filter also transmits infra-red even better than ultra-vio
. Biological effects of radiation; mechanism and measurement of radiation, applications in biology, photochemical reactions, effects of radiant energy on organisms and organic products. Radiation; Biology. ^^ 60 " 50 10 20 50 40 50 60 70 80 90100110120150140150160110180190200210220250240250260270 Time in MInu+es rradiation. Fig. 10 20 30 40 50 60 70 80 90 100110120150140150160110180190 200 Time in Minu+es -Effect of raying on the rate of respiration of etiolated pea seedlings. Masure, 11.) (After Popp and Brown claim that this filter also transmits infra-red even better than ultra-violet and thus challenge any evidence derived from its use as a test of the influence of ultra-violet on either growth or respiration. The results obtained by Masure for the effect on respiration are shown in the above graph taken from his paper. It shows clearly that the rate of respiration is temporarily increased by the rays which pass the filter and ultra-violet is at least a part of this effective radiation. Its effects disappear soon after it is discontinued. The preliminary drop in respiration soon after the radiation is applied is said by Masure to represent an expansion of the seeds as they are heated by the rays which they absorb. This is possible because the respiration is measured as O2 consumption read from the movement of a column of liquid in equilibrium with the gas pressure within the experimental chamber. However, this heat effect must also influence the production of CO2 and the consumption of O2 throughout the period of irradiation. Only two of these experiments have been reported. In view of the small amount of evidence here and the lack of confirmation of it else- where it must be said that we do not know yet just how ultra-violet. 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 Duggar, B
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Keywords: ., bookau, bookcentury1900, booksubjectbiology, booksubjectradiation
