920 



LIGHT AND LIFE 



Low transition energy: 53 



Luciferase, gonyaulax: purification of, 

 298; rates of inactivation at several 

 difTcrent temperatures, 303 



Liiciferasc-luciferin reaction: 206 



Luciferase-oxyluciferyl-adenylic acid dis- 

 sociation of: 229 



Luciferase, Renilla, specificity of: 282 



Luciferin: absorbance spectra of, 239; 

 cypridina, 258; firefly, structure, 254; 

 fluorescence spectra of, 240, 244; and 

 oxyliiciferin, fluorescence yields of, 

 242; structure of, 213; -luciferase re- 

 action, 206; Renilla, 275; Renilla, spe- 

 cificity of, 282 



Luciferyl-adenylate-AMP: effect of pyro- 

 phosphate on light emission from, 

 225; light from, 225 



Luciferyl-adenylate enzyme complex: 

 221 



Lucigenin, structural formula: 183 



Luminescence: of dried materials, 209; 

 efl^ect of oxygen concentration on, 236; 

 effect of oxygen concentration on time 

 course of, 237; effect of salts upon, 

 299; effect of temperature on, 237 



Luminescence, bacterial: and aldehyde, 

 251; and flavin mononucleotide, 250 



Luminescence of Renilla reniformis: bio- 

 chemistry of, 274; effect of inhibitors 

 on, 285; effect of nucleotide concentra- 

 tion on. 278; effect of pH on, 283; 

 effect of temperature on, 284; effect of 

 various luciferin preparations, 282 



Luminescent cross-reaction of partially 

 purified, highly diluted luciferase of 

 Cypridina and Apogon: 216 



Luminescent reaction in Gonyaulax, 

 oxygen requirement in: 297 



Luminescent systems, specificities of re- 

 lationsiiips of different: 214 



Luminol, chemiluminescence: 183, 201; 

 emission spectrum of, 203; quantum 

 \icl(l for various pH values, 204 



Luminol, light reaction: 200 



Luminol, structural formula: 183 

 Luminol fluorescence: 201; quantum 

 yield as a function of pH. 202 



Linninrhodopsin: 725 



Lysozyme, polarization spectra: 100 

 M 



Metarhodopsin: 725, 735 



Methaemoglobin-reducing factor: 640 



N-Methyl indole, polarization spectrum 

 of: 89 



9-Methylpurine: 59 



Microsomal cytochrome reductase: 138 



Molecular orbitals: classification of, 36; 

 and configurations in formaldehyde, 

 14; and configurations in pyridine, 16; 

 and electronic states, symmetry, classi- 

 fications of, 39; symmetry species classi- 

 fication of, 42 



Molecular structure and excited states: 

 1 



N 



n ^ IT* transitions: characteristics of, 

 49; definition of, 32; in N-hetero- 

 cyclics, 37; long wavelength shoulders 

 and tails, 55; nature and significance 

 of, 31; in polyatomic molecules, 31; 

 singlet-singlet in pyridine, 17; singlet- 

 triplet, 16 



Nematoscelis: 756 



Nicotinamide riboside moiety of DPN 

 (I) and DPNH, skeletal models of: 

 115 



Nilzchia: 401 



Non-bonding orbitals: 15 



Non-radiative energy transfer: 26 



Nostoc: 348, 401 



Notonecta: 772 



\'\cli plumes: 756 



O 



Ochromonas danica: derivative absorp- 

 tion spectrum of, 451, 453; fluorescence 

 of, 481 



Opsin: 725 



Optical rotatory strength: 46 



Orbitals: classification according to sym- 

 metry species, 40; electronic, states 

 and transitions, 12; in heteroatom 

 molecules, types of "lone pair." 34; 

 molecular, symmetry species classifi- 

 cation of, 42 



