SUBJECT INDEX 



923 



I'lirple bacteria, photo-spin signals in: 

 345 



Pyiazine: 55; near ultraviolet absorption 

 curves, 56 



Pyridazine, near ultraviolet absorption 

 cur\es of: 56 



Pyridine, molecular orbitals and con- 

 figurations in: 16 



Pyriniidine, near ultraviolet absorption 

 curves: 58 



Pyriinidine, n-orbitals; schematic con- 

 tour diagrams of: 43 



Pyridine nucleotide: complex of micro- 

 somal cytochrome bs reductase, ab- 

 sorption spectrum of, 140; enzyme 

 complexes, 117; enzyme complexes, 

 some properties of, 119 



Pyridine nucleotide reductase, photosyn- 

 thetic: 499, 637 



Pyridine nucleotide reduction by hydio- 

 genase: 529 



Pyridine nucleotides: interactions in, 

 144; spectra and structure in enzyme 

 complexes of, 108 



Pyridine ring nitrogen, isomerism at the: 

 115 



Pyro ten this: 756 



Pyrimidine: 58 



Q 



Quantum yield of firefly biolumines- 

 cence: 244, 246 



Quantum yield of himinol for various 

 pH values, chemiluminescence: 204 



Quenching by chemical reaction: 73 



Quenching of fluorescence of tyrosine 

 derivatives, acid: 84 



Quenching by a molecule with a lower 

 triplet state: 72 



Quenching by paramagnetic substances: 

 71 



Quinoxaline: 55; near ultraviolet absorp- 

 tion cur\es, 57 



R 



Radiationless decay to ground state: 71 

 Radiative decay to ground state: 71 

 Radical-like excited states: 54 



Renilla luciferin and luciferase, specifi- 

 city of: 282 



Renilla renijormis luminescence: bio- 

 chemistry of, 274; effect of inhibitors 

 on, 285; effect of nucleotide concen- 

 tration on, 278; effect of pH on, 283; 

 effect of temperature on, 284 



Retinal noise and excitation by light: 

 718 



Retincne, mechanism of bleaching: 732 



Retinenci: 724 



Retinenej: 724 



9-c/5 retinene: 734 



1 l-c/i retinene: 734 



Rhodopseiidomonas spheroides: 345, 436; 

 difference spectra of, 438 



Rhodopsin: 725; absorption spectra of 

 chicken, 742; in human rods, absorp- 

 tion of light, 738; light action on, 733; 

 in normal and rod monochromat, 

 regeneration of, 717; reaction involved 

 in bleaching, 736; regeneration meas- 

 urements in man, 716; in solution, 

 synthesis and bleaching of, 730; sys- 

 tem, diagram of, 726 



Rliodospirillum rubrum: 345, 365, 436; 

 absorption spectrum of, 346; difference 

 spectra of, 437, 439; effect of inhibi- 

 tors on respiration, 441; ESR signals 

 from, 342; respiration and light-in- 

 duced phosphorylation in extracts of, 

 441 



Ribonuclease, polarization spectra: 96 



Rotational relaxation times: 102 



Rotatory dispersion of DNA: 61 



Scenedesmiis: 401 



Semiquinone formation of flavins and 



flavoproteins: 167 

 Sensitization of photosynthesis: 398 

 Sensitization of photophosphorylation in 



presence of PMS: 411 

 Singlet-triplet u-tt* transitions: 16 

 Singlet-singlet n-7r* transitions in pyri- 

 dine: 17 

 Spectra of N-heterocyclics: 54 

 Spectral changes in photosynthesis: 397 

 Spectral sensitivities on honeybee: 784 



