. 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. 168 BIOLOGICAL EFFECTS OF RADIATION 100 A per degree, and consequently the cell must be subjected to accurate thermostatic control. (6) It has the same objections as the monochro- mator in that it produces only a limited area and solid angle of effective source. If such a Christiansen filter is used with extended source and without a small restricting aperture, one secures a wave-length dist
. 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. 168 BIOLOGICAL EFFECTS OF RADIATION 100 A per degree, and consequently the cell must be subjected to accurate thermostatic control. (6) It has the same objections as the monochro- mator in that it produces only a limited area and solid angle of effective source. If such a Christiansen filter is used with extended source and without a small restricting aperture, one secures a wave-length distribution fairly Wave- Length ^000 6,000 8,000 A Wave-Length 6,000 4,000 ^^ '^. 5,000 aoooA eiOOO 7000 8,000 A 5,000 6,000 ^000 Wave - Length Wave-Length Fig. 14.—Effectiveness of Christiansen filter: Upper left—transmission of filter: 1. small area illumination; 2. large area illumination. Upper right—radiation trans- mitted by filters. Lower left—absorption coefficient a base 10 of chlorophyll A in ether. Lower right—radiation absorbed by chlorophyll A solution from transmitted beam, showing maxima both in region of maximum transmission and also in region of maximum absorption. Note wave-length shift with increased area of illumination. narrow at one-half intensity, but spreading out rapidly at low intensities. This is more aggravated on the long wave-length side. In favor of the Christiansen filter, wave-length bands may be secured anywhere in the visible or near ultra-violet. Wave-length change can be made over a limited range by change in temperature, and over a wider range by vary- ing the liquid. For work in the visible, ordinary optical crown glass, index of refraction to , serves satisfactorily as the transparent. 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,
Size: 1746px × 1432px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookau, bookcentury1900, booksubjectbiology, booksubjectradiation
