. The Biological bulletin. Biology; Zoology; Marine biology. BACTERIAL SENSITIVITY TO ULTRAVIOLET 121 Portions of the bacterial plate were exposed for different time intervals, and the relative bacterial destruction determined for the various wave lengths and times of exposure. Since these experiments were con- ducted at the time of maximal sensitivity and when minimal sensitivity changes occurred, the Bunsen-Roscoe law was used for our calculations. By comparing the spectral lines on the bacterial plates, the bactericidal effect of a line of a certain wave length could be matched with that of
. The Biological bulletin. Biology; Zoology; Marine biology. BACTERIAL SENSITIVITY TO ULTRAVIOLET 121 Portions of the bacterial plate were exposed for different time intervals, and the relative bacterial destruction determined for the various wave lengths and times of exposure. Since these experiments were con- ducted at the time of maximal sensitivity and when minimal sensitivity changes occurred, the Bunsen-Roscoe law was used for our calculations. By comparing the spectral lines on the bacterial plates, the bactericidal effect of a line of a certain wave length could be matched with that of another wave length when obtained at a shorter or longer exposure time. Considering also the energy distribution throughout the spectrum, we were able to determine the bacterial sensitivity over the ultraviolet spec- trum between the wave lengths of approximately 240 and 400 m/x,. These results represent relative figures, since the absolute energy densi- ties of the individual spectral lines could not be measured and the point of 50 per cent destruction could not be exactly determined. Figure 10. 240 250 260 270 280 290 300 310 Wave length in myu. Fig. 10. Spectral sensitivity distribution (arbitrary figures) for B. prodigiosus m B. coli • . demonstrates graphically the results, in which the maximal relative sensitivity is called arbitrarily 100. The bacterial sensitivity starts be- tween 313 and 302 m/x, reaches its maximum at about 260, and declines. 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Press, inc. [etc. ]
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