SUBJECT INDEX 



473 



Iodine, as^say with P", 10 

 coiupouuda ill bile, 382-383 

 mass and thyroid uptake, 60-61 

 study of, in plasma, 257 

 summary, 255-251) 

 Iodine (P^M, as albumin label, 11 

 dosage lev(»Is, 257 

 to doul)le-lab(4 amino acids, 47 

 in vivo counting, 192-195 

 in vivo methods with cattle, 193 

 in vivo usage of, 5 

 labeled compounds, 258-259 

 paper chromatography, 382-383 

 radiation effects from, 68 

 summary, 255-259, 448 

 thyroxine label, 341-342 

 Ion, 435 



Ion accumulation in roots, 152 

 Ion chamber sensitivity for C^\ 225 

 Ion density, 435 



Ion exchange, amino acid separations, 

 395-397 

 anion exchangers, 388-390 

 apparatus for, 391-393 

 biological applications, 407-410 

 cation exchangers, 388-390 

 chromatography, 388 

 complex-ion study, 406-407 

 concentration of traces, 400-402 

 definition, 435 

 explanation, 387-391 

 isomers shown by, 404 

 procedures, 393-394 

 removal of impurities, 400 

 resins for, 390 

 salt determination, 404-406 

 survey of applications, 407-410 

 Ion-exchange separations, of amino 

 acids, 308, 395-397 

 based on acidic or basic strength, 



395-397 

 of cations, 402 



by complex formation, 398-399 

 of ions, of different size, 398 

 from nonelectrolytes, 395 

 of opposite charge, 394-395 

 of nucleic acids, 404-405 

 of sugars, 398-399 

 Ion movement, permeability, 4 



placental transfer, 4 

 Ion transport, 7 

 Ionization, definition, 435 



specific, 84, 441 

 Ionization chamber, air wall, 427 

 definition, 435 

 extrapolation, 432 

 free-air, 433 

 thimble, 442 



Ionization chamber, tissue-equivalent, 



442 

 Ionization density, 435 

 Ionization path (or track), 435 

 Ionization volume, 443 

 Ionizing radiation, 435 

 Iridium (Ir*), summary, 260, 448 

 Iron, double labeling, 46 



histochemical studies, 263 

 summary, 261-264 

 Iron (Fe*), blood preservation studied 

 by, 50 



double counting, 191, 263 



plant movement, 345-346 



plasma protein removal, 20-21 



as red-cell label for blood volume, 11 



for red-cell-life-span assay, 40 



summary, 261-264, 448 



use in human beings, 69 

 Irradiation, 435 

 Isomer, nuclear, 435 

 Isomeric transition, 435 

 Isomers, ion-exchange separation, 404 

 Isotope, 1, 435 



Isotope-dilution analysis, in chemical 

 analysis, 15 



definition, 10, 435 



direct method, 15-17 



inverse method, 17 



modification of, 17 



volume determinations, 10 



vitamin B12 assay by, 16 

 Isotope effects, with C^* compounds, 77 



definition, 435 



on equilibrium constant, 76 



intermolecular, 77 



intramolecular, 78 



on reaction rates, 77-78 



in tracer studies, 76-79 

 Isotope storage, 123-125 

 Isotopic exchange, 435 



K-electron capture, 435 



Ketosteroid separations by chromatog- 

 raphy, 383 



Kilo-electron-volt (kev), definition, 84, 

 435 



Kilocuric, 435 



Kinetics, first-order equations, 18-39 

 general considerations, ;58-40 



Kjeldahl method for wet-ashing, 161-162 



Krypton (Kr**"), in vivo usage, 5 



Label exchange from molecules, 73 

 Labeled compounds, with carbon 14, 226- 

 229 



