PHYSICAL AND BIOLOGICAL FACTORS 953 



Karnofsky, D. A., P. A. Patterson, and L. P. Ridgway (1950) The toxicity of 

 roentgen rays to the chick embryo. Am. J. Roentgenol. Radium Therapy, 64: 



280-288. 

 Kelly, L. S., and H. B. Jones (1950) Effects of irradiation on nucleic acid formation. 



Proc. Soc. Exptl. Biol. Med., 74: 493-497. 

 Kimeldorf, D. J., D. C. Jones, and M. C. Fishier (1950) The effect of exercise upon 



the lethality of roentgen rays for rats. Science, 112: 175-176. 

 Knowlton, N. P., Jr., and L. H. Hempelmann (1949) The effects of X-rays on the 



mitotic activity of the adrenal gland, jejunum, lymph node and epidermis of the 



mouse. J. Cellular Comp. Physiol., 33: 73-91. 

 Kohn, H. I. (1949) On the modification of the toxicity of X rays by immunization. 



USAEC Report AECU-610.* 

 Lacassagne, A. (1942) Chute de la sensibilite aux rayons X chez la souris nouveau- 



nee en etat d'asphyxie. Compt. rend. acad. sci. URSS, 215: 231-232. 

 Lampe, J., and F. J. Hodges (1943) Differential tissue response to neutron and 



roentgen radiations. Radiology, 41: 344-350. 

 Lasnitzki, I. (1943a) The effect of X rays on cells cultivated in vitro. II. Recovery 



factor. Brit. J. Radiology, 16: 61-67. 

 (1943b) The response of cells in vitro to variations in X-ray dosage. Brit. J. 



Radiology, 16: 137-141. 

 (1948) Effect of /3 rays on cells cultivated in vitro. Brit. J. Radiology, 21: 



265-269. 



and D. E. Lea (1940) The variation with wavelength of the biological effect 



of radiation. Brit. J. Radiology, 13: 149-162. 

 Latarjet, R., and B. Ephrussi (1949) Courbes de survie de levures haploides et 



diplo'ides soumises aux rayons X. Compt. rend., 229: 306-308. 

 Lawrence, J. H., and E. O. Lawrence (1936) The biological action of neutron rays. 



Proc. Natl. Acad. Sci. U.S., 22: 124-133. 

 Lawrence, J. S., A. H. Dowdy, and W. N. Valentine (1947) The effects of radiation 



on hemopoiesis. USAEC Report MDDC-853.* 

 Lea, D. E. (1946) Actions of radiations on living cells. Cambridge University Press, 



London (The Macmillan Company, New York, 1947). 

 LeMay, M. (1951) Effect of X radiation upon succinoxidase of rat kidney. Proc. 



Soc. Exptl. Biol. Med., 77: 337-339. 

 Leppin, O. (1896) X. Kleine Mittheilungen. Deut. med. Wochschr., 22 (28): 454. 

 Limperos, C, and W. A. Mosher (1950) Protection of mice against X radiation by 



thiourea. Science, 112: 86-87. 

 Loiseleur, J., and G. Velley (1950a) Immunite conferee par l'hyperglycemie, contre 



les rayons X administres a dose lethale. Compt. rend.. 231: 182-184. 

 anc j (1950b) Traitement curatif des radiolesions consecutives a 



l'administration d'une dose lethale de rayons X. Compt. rend., 231 : 529-531. 

 Lorenz, E., D. Uphoff, T. R. Reid, and E. Shelton (1951) Modification of irradiation 



injury in mice and guinea pigs by bone marrow injections. J. Natl. Cancer Inst., 



12: 197-201. 

 MacComb, W. S., and E. H. Quimby (1936) The rate of recovery of human skin from 



the effects of hard or soft roentgen rays or gamma rays. Radiology, 27: 196-207. 

 MacKee, G. M., A. Mutscheller, and A. C. Cipollara (1943) Time factor in irradia- 

 tion. Arch. Dermatol, and Syphilol., 47: 490-497. 

 Mayer, S. H., and H. M. Patt (1953) Potentiation of cysteine protection against 



X radiation by dinitrophenol or hypoxia. Federation Proc, 12: 94-95. 

 Mazia, D., and G. Blumenthal (1948) Inactivation of enzyme-substrate films by 



small doses of X rays. Proc. Natl. Acad. Sci. U.S., 34: 328-336. 



