206 



SUBJECT INDEX 



Triphenyltetrazolium Chloride and cy- 

 toplasmic mutation 142, 146 



Tn'psinogen 122, 123 



Tr\T)tophane 

 analogues 108 

 -less mutants 7, 9, 16, 21 

 oxidation and eye pigments 7 

 peroxidase in Drosophila 10 

 peroxidase in liver 139, 140 

 "repression" by 130, 134 

 sequential induction in Try metabo- 

 lism 128 

 synthetase 9, 10, 18, 21, 90, 130 



Tyrosinase in Neurospora 22, 132 



Tyrosine Transaminase 139, 140 



Ultraviolet Radiations 



absorption in cytoplasm 40, 41 



absorption by DNA 30 



action spectrum on mutations 27 



causing the loss of chloroplasts 145 



effect of early phase of enzyme induc- 

 tion 136 



effect of HeLa cells 89 



effect on RNA metabolism in Aceta- 

 bularia 87 



effect of Vitamin B12 on restoration 

 after 112 



formation of respiratory deficient 

 mutants 142 



inhibition of DNA synthesis 59 



and RNA heterogeneity 64 

 Uridinetriphosphate 69, no 



Viruses containing RNA 25, 47 

 effect of analogues on 25 

 effect of RNAse on 25 et seq. 

 infectious RNA 26, 66 

 mutants 25, 26, 34 



structure of RNA of 3 1 et seq. 

 see also Tobacco mosaic virus 

 Vitamin B12 



on amino acids incorporation 112 

 restoration after U V irradiation 112 



Xanthine Oxidase adaptation in animal 

 tissues 139 



X-Rays 



and antibodies formation 161 

 diffraction by DNA 30 

 diffraction by RNA 32 

 effect on enzyme synthesis 132 

 inhibition of DNA synthesis 59 

 inhibition of RNA metabolism 67 



Yeast B12 



effect on restoration after UV irradia- 

 tion 112 

 a-glucosidase induction 68, 133 

 high turnover RNA 82 

 induction of peroxidases 137 

 induction and repression in 126 et seq. 

 inhibition of DNA synthesis 59 

 inhibition of enzyme induction 132 

 long-term adaptation 149 

 nucleopeptide 116 

 particles 47 

 respiratory enzymes synthesis in 137, 



141 

 ribosomes 46 



RNA and protein synthesis 85 

 soluble RNA 65, 103, 104 

 transfer RNA 103 

 see also Saccharomyces cerevisiae 



Zymogens 45, 96 



transformation in active enzymes 123 



