198 RADIATION BIOLOGY 



Jacobs, L. E., and J. R. Piatt (H)48) Does ultraviolet absorption intensity increase 



in solution? J. Clu>m. IMiy.s., 10: 1137-1145. 

 Jacobson, W., and D. M. Simpson (1946) The fiuorcscciicc ,s|)('ctra of pterins and 



their |)ossihle use in the elucidation of the antipernicious anaemia factor. I'art 1. 



Biociiem. J. London, 40: 3-9. 

 Jones, R. N. (1943) The ultraviolet absorption .spectra of aromntic liydrocarbons. 



Chem. Revs., 32: 1-40. 



(1948) The characterization of sterol hormones l)y ultraviolet and infrared 



spectroscopy. Recent Progr. Hormone Research, 2: 3-29. 



Kaczka, E., D. E. Wolf, and K. Folkers (1949) Vitamin Bi... V. Identification of 



crystalline vitamin Bi>a. J- Am. Chem. Soc, 71: 1514-1515. 

 Karrer, P., and iC. Jucker (1948) Carotinoide. E. Birkhauser, Ba,sel. 

 Karrer, P., G. Schwarzenback, F. Benz, and U. Solmssen (1936) Uber Reduktions- 



j)rodukte des Xicotinsaurc-amid-Jodmethylats. Helv. Chim. Acta, 19: 811-828. 

 Karrer, P., and O. Warburg (193()) Jodmethylat des Xicotinsiiureamids. Biochem. 



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 Kasha, M. (1947) Phosphorescence and the role of the triplet state in tlie electronic 



excitation of complex molecules. Chem. Revs., 41: 401-419. 

 Klingstedt, F. W., (1922) Spectres d'absorption ultraviolets des diphenols. Compt. 



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 Kretchmer, X., and R. Taylor (1950) Effect of pH on the far ultraviolet absorption 



of tyrosine. J. Am. Chem. Soc, 72: 3291-3292. 

 Kuhn, H. (1949) A quantum-mechanical theory of light ab.sorption of organic dyes 



and similar compounds. J. Chem. Phys., 17: 1198-1212. 

 Kunitz, M. (1946) A spectrophotometric method for the measurement of ribo- 



nuclea.se activity. J. Biol. Chem., 164: 563-568. 

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Spectrophotometric method for the measurement of desoxyribonuclease activity. 



J. Gen. Physiol., 33: 349-362. 

 Lennard-Jones, J. (1949) The molecular orbital theory of chemical valency. I. The 



determination of moIecvUar orbitals. I'roc. Roy. Soc. London, .\198: 1 13. 

 Levene, P. A., and L. W. Bass (1931) Nucleic acids. Chemical Catalog Company, 



Inc., New York. 

 Lewis, G. N., and J. BigeleLsen (1943a) Further photo-oxidations in rigid media. 



J. .4m. Chem. Soc, 65: 2424-2426. 



(1943b) The y bands in absorption spectra. J. Am. I'hein. Soc, 65: 2102- 



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Lewis, G. N., and M. Calvin (1939) The color of organic suljstances. Chem. Revs., 



25: 273-328. 

 Lewis, G. N., and D. Lipkin (1942) Reversible photochemical processes in rigid 



media: The dissociation of organic molecules into radicals and ions. J. Am. 



Chem. Soc, 64: 2801-2808. 

 Longuet-Higgins, H. C, C. W. Rector, and J. R. Piatt (1950) Molecular orbital 



calculations on porphine and tetrahydroporphine. J. Chem. Phys., 18: 1174- 



1181. 

 Loofbourow, J. R. (1940) Bordcrhuul problems in biology anil physics. Revs. 



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(1943) Physical methods for the identification and assay of vitamins and 



hormones. Vitamins and Hormones, 1: 109 155. 



Loofbourow, .1. P.. B. S. Gould, and 1. W. Sizer (1919) Studies on I lie uHnniolct 

 absorption spectra of collagen. Aich. Bioclicm., 22: KUi 111. 



McClure, D. S. (1949) Trijilet -singlet transitions in organic molecules. Life-time 

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Maccoll, A. (1947) Color and constitution. Quart. Revs. London, 1: 16-58. 



