632 ISOTOPIC TRACERS AND NUCLEAR RADIATIONS [Chap. 30 



30.45. Rubidium 



Rb 1 Greenberg, D. M., R. B. Aird, M. D. D. Boeltee, W. W. Campbell, W. E. Cohn, 

 and M. M. Murayama: A study with radioactive isotopes of the permeability of 

 blood-cerebrospinal fluid barrier to ions, Am. J. Physiol., 140, 47-64 (1943). 



Rb 2 Hamilton, J. G., and G. A. Alles: The physiological action of natural and artificial 

 radioactivity, Am. J. Physiol., 125, 410-413 (1939). 



Rb 3 Overstreet, R., and L. Jacobson: The absorption by roots of rubidium and phos- 

 phate ions at extremely small concentration as revealed by experiments with Rb 86 

 and P 32 prepared without inert carrier, Am. J. Botany, 33, 107-112 (1946). 



Rb 4 Stout, P. R.: Applications of radioactive K, Rb, Na, P, and Br to studies of the 

 mineral nutrition of higher plants, /. Applied Phys., 12, 327 (1941). 



30.46. Ruthenium 



Ru 1 Dailey, M., I. Wender, and R. Abrams: Tracer studies with inhaled 1.0 year 

 ruthenium, U.S. Atom. Energy Comm. Declass. Doc. MDDC 420. 



Ru 2 Hamilton, J. G.: The metabolism of the fission products and the heaviest elements, 

 Radiology, 39, 325-343 (1947). 



30.47. Selenium 



Se 1 McConnell, K. P.: Distribution and excretion studies in the rat after single sub- 

 toxic subcutaneous injection of sodium selenate containing radioselenium, /. Biol. 

 Chem., 141, 427-437 (1941). 



Se 2 McConnell, K. P.: Respiratory excretion of selenium studied with the radioactive 

 isotope, /. Biol. Chem., 145, 55-60 (1942). 



30.48. Sodium 



Na 1 Anderson, E., and M. Joseph: Electrolyte excretion studies in rats maintained 

 on low-Na and low-K diets, Proc. Soc. Expetl. Biol. Med., 40, 344-347 (1939). 



Na 2 Anderson, E., and M. Joseph: Urinary excretion of radioactive Na and K in 

 adrenalectomized rats with and without salt, Proc. Soc. Expetl. Biol. Med., 40, 

 347-350 (1939). 



Na 3 Anderson, E., M. Joseph, and H. M. Evans: The use of radio-sodium and radio- 

 potassium in the study of adrenal physiology, /. Applied Physics, 12, 316 (1941). 



Na 4 Anderson, E., M. Joseph, and V. Herring: Changes in excretion of radioactive 

 sodium and potassium and in carbohydrate stores twenty-four hours following 

 adrenalectomy, Proc. Soc. Expetl. Biol. Med., 42, 782-785 (1939). 



Na 5 Anderson, E., M. Joseph, and V. Herring: Salt after adrenalectomy. II. 

 Urinary excretion of radioactive Na and K in adrenalectomized rats given various 

 levels of salt, Proc. Soc. Expetl. Biol. Med., 44, 482-485 (1940). 



Na 6 Barany, E.: Mode of entrance of sodium into the aqueous humor, Nature, 157, 770 

 (1946). 



Na 7 Berggren, H.: The mineral metabolism in the dental hard tissues, Acta Radiol., 

 27, 249-256 (1946). 



Na 8 Brewer, A. K., and A. Branley: A radioactive isotope study of the absorption 

 of phosphorus and sodium by corn seedlings, Science, 91, 269-270 (1940). 



Na 9 Cohn, W. E., and E. T. Cohn: Permeability of red corpuscles of the dog to sodium 

 ion, Proc. Soc. Exptl. Biol. Med., 41, 445-449 (1939). 



Na 10 Cope, O., W. E. Cohn, and A. G. Brenizer, Jr.: Gastric secretion. II. Absorp- 

 tion of radioactive sodium from pouches of the body and antrum of the stomach 

 of the dog, /. Clin. Invest., 22, 103-110 (1943). 



