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36. Clark, Francis E., and C. A. I. Goring: Growth of Bacteria in the Presence of 

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37. Giles, Norman H., and Rene A. Bolomey: Cytogenetical Effects of Internal Radia- 

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38. Lemmon, Richard M.: Radiation Decomposition of Carbon- 14-labeled Com- 

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39. Edwards, R. R.: Isotopic Tracers in Chemical Systems, Ann. Rev. Nuclear Sci., 

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40. Conference on Isotopic Exchange Reactions and Chemical Kinetics, Dec. 1-3, 

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41. Isotope Separation and Isotope Exchange, A Bibliography of Unclassified Litera- 

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42. Samos, George: Some Observations on Exchange of CO2 between BaCOs and CO 2 

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43. Calvin, Melvin, Charles Heidelberger, James C. Reid, Bert M. Tolbert, and 

 Peter F. Yankwich: "Isotopic Carbon," John Wiley & Sons, Inc., New York, 

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44. Chaikoff, I. L., and D. B. Zilversmit: Radioactive Phosphorus: Its Application 

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45. Fager, E. W., and J. L. Rosenberg: Exchange Reactions and Phosphoglyceric 

 Acid in Photosynthesis, Arch. Biochem. and Biophys., 37: 1-4 (1952). 



46. Hodge, Harold C. : The Role of Exchange in Calcium and Phosphate Adsorptions 

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47. Comar, C. L., W. E. Lotz, and G. A. Boyd: Autoradiographic Studies of Calcium, 

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48. Neuman, W. F., and M. W. Neuman: The Nature of the Mineral Phase of Bone, 

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49. Hansard, Sam L. : The Effects of Age upon Calcium Absorption, Deposition and 

 Exchange in Animals, Thesis submitted to the University of Florida, June, 1953. 



50. Comar, C. L., R. A. Monroe, W. J. Visek, and Sam L. Hansard: Comparison of 

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51. Overstreet, R., and T. C. Broyer: The Nature of Absorption of Radioactive 

 Isotopes by Living Tissues as Illustrated by Experiments with Barley Plants, 

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52. Yankwich, Peter E. : Radioactive Isotopes as Tracers, Anal. Chem., 21: 318-321 

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53. Nier, Alfred O., and Earl A. Gulbransen: Variations in the Relative Abundance 

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54. Urey, Harold C. : Oxygen Isotopes in Nature and in the Laboratory, Science, 108 : 

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55. Weigl, John W. : The Relation of Photosynthesis to Respiration, UCRL-590, 

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