210 



NDEX 



Pyrimidine(s) (continuation) 

 — , spectrophotometric determina- 

 tion, 9 



Rat tissues, nucleotide ratios in ri- 

 bonucleoproteins of liver and 

 kidney and cytoplasm of liver and 

 kidney, 69, 94, 119 



— , pleromeric relationships in liver 

 DNA, 156 



— , uptake in vivo of radioactive 

 leucine by liver cytoplasm, 116 



Reflections on present trends in bio- 

 logical sciences, 100-102 



Regularities in composition of nu- 

 cleic acids, meaning, 93-96 



of RNA's and DNA's, 13, 



28, 30, 51-52, 54, 66, 72, 86-88, 

 93-96, 106, 120, 127, 128, 131, 

 155, 164, 170 



Replacement, meaning of the term, 

 — of natural purine or pyrimi- 

 dine in nucleic acids by analogues, 

 150 



Ribonuclease, action on pentose 

 nucleic acid of yeast and pig liver, 

 composition of dialyzable nucleo- 

 tides and core (table), 34 



— from pancreas, 18, 34, 35 

 Ribonucleic acid, see pentose nucleic 



acids, RNA, PNA 

 Ribonucleoprotein(s), links between 

 nucleic acid and protein, 64, 80 



— of the ribosomes, 165 



Ribonucleotides, methods for sepa- 

 ration and quantitative determi- 

 nation in an aqueous ammonium 

 isobutyrate-isobutyric acid sys- 

 tem, 9 



Ribosomes, 165 



RNA (see also pentose nucleic 

 acids, ribonucleic acids, PNA) 



— and DNA, remark about the 

 terms — , 84 



Rye germ DNA, comparison of the 

 pyrimidine distribution in total 

 DNA with that in DNA fractions, 

 139-141 



Rye germ DNA (continuation) 

 — , pleromeric relationships, 154 



Salmon DNA, identity of composi- 

 tion as regards distribution of ni- 

 trogenous constituents with sheep 

 DNA, 137 



— , molar ratios, 30 



Salmon sperm DNA, composition, 

 29, 30, 87 



Sea urchin DNA, dissymmetry ra- 

 tio, 66 



— sperm DNA, 42, 66, 138 

 Sequence analysis of DNA, 31, 33, 



90,91 



— of nucleic acids, lines of attack, 

 91,92 



, possibilities of cluster anal- 

 ysis, 148-150 



— , remarks on the conceptual basis 

 of _, 127-128 



Sequence characteristics common to 

 all DNA's, 147-148 



— of DNA, occurrence of at least 

 70% of the pyrimidines in animal 

 and plant DNA as oligonucleo- 

 tide tracts containing three or 

 more pyrimidines in a row, 148 



— of nucleic acids, 124 

 Sequence investigation, apurinic 



acid, 133, 134 

 — , early attempts, 132 



— of nucleic acids through differ- 

 ential distribution analysis, see 

 differential distribution analysis 



— , the problem of statistical analy- 

 sis, 130-131 



— , stepwise degradation of DNA 

 by deoxyribonuclease, 133 



Sequence of nucleotides in DNA, 

 the problem of non-randomness, 

 147, 148 



Sequence studies of DNA, differ- 

 ence in stability to acid of purine 

 and pyrimidine nucleosides in 

 DNA, 135, 166 



