XVI. STABLE ISOTOPES AS TRACERS 597 



ACCKSSORY EQUIPMKNT 



9. Penick, D. B., Rev. Sd. Instruments, 6, 115 (1935) (electrometer tube, 

 d.c. amplifier). 



10. Ridenour, L. N., Rev. Sd. Instruments, 12, 134 (1941) ("Magic Eye" 



ionization gage). 



11. Taylor, R. C, and W. S. Young, Ind. Eng. Chem., Anal. Ed., 17, 811 



(1945) (sintered glass leak). 



12. Thomas, H. A., T. W. Williams, and J. A. Hippel, Rev. Sd. Instruments, 



17, 369 (1946) (mass spectrometer type of leak detector; ion gage). 



13. Nier, A. 0., E. P. Ney, and M. G. Inghram, Rev. Sd. Instruments, 18, 191, 



294 (1947); cf. ibid., 18, 18 (1947) (adjustable gas leak and inverse 

 feedback d.c. amplifier; electrometer tubes). 



14. Hunt, F. v., and R. W. Hickman, Rev. Sd. Instruments, 10, 6 (1939) 



(high voltage regulated power supply). 



METHODS AND TECHNIQUE 



15. Reitz, 0., Z. Elektrochem., 45, 100 (1939) (oxygen exchange reactions). 



For deuterium, see ibid., 44, 1 (1938); for sulfur, see Chem. Revs., 

 27, 255 (1940). 



16. Rittenberg, D., and G. L. Foster, /. Biol. Chem., 133, 737 (1940) (isotope 



dilution technique; cf. Sdence, 107, 228 (1948). 



17. Kamen, M. D., Radioactive Tracers in Biology. Academic Press, New 



York, 1947 (methods, applications; sjoitheses with C, H, and S). 



18. Brewer, A. K., and V. H. Dibeler, /. Research Natl. Bur. Standards, 35, 



125 (1945) (hydrocarbon gas analysis). 



19. Young, W. S., Natl. Petroleum News (Technical Section), March 6, 1946 



(operation and maintenance hints). 



20. Henriques, F. C, Jr., and C. Margnetti, Ind. Eng. Chem., Anal. Ed., 18, 



420 (1946) (microdecomposition of water). 



21. Van Slyke, D. D., and J. Folch, /. Biol. Chem., 136, 509 (1940) (carbon 



combustion technique). 



22. Osburn, 0. L., and C. H. Werkman, Ind. Eng. Chem., Anal. Ed., 4, 421 



(1932) (persulfate oxidation of carbon). 

 22a. Calvin, M., C. Heidelberger, J. C. Reid, B. M. Tolbert, and P. E. 



Yankwich, Isotopic Carbon. Wiley, New York, 1949. 

 22b. R^dm, N. S., Nucleonics, 1, No. 2, 49 (1947). 



BIOLOGICAL ACCOMPLISHMENTS 



23. Schoenheimer, R., Dynamic State of Body Constituents. Harvard Univ- 



Press, Cambridge, Mass., 1942 (fat and protein metabolism, D, and 

 NI6). 



24. Schoenheimer, R., and D. Rittenberg, Physiol. Revs., 20, 218 (1940) 



(animal metabolism; methods using D and N^^). 



