ScienceJohn Michels (Journalist) 1947 |
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Стр. 243
... chemical in nature , in one of the genes which compose the chromosome thread . The mutated gene is as stable as the ... Chemical substances with mutagenic properties should be particularly useful tools for attacking the problems of ...
... chemical in nature , in one of the genes which compose the chromosome thread . The mutated gene is as stable as the ... Chemical substances with mutagenic properties should be particularly useful tools for attacking the problems of ...
Стр. 246
... chemical reaction may be tentatively ascribed to the different amounts of energy involved in the two types of reaction . In short - wave radiation the energy made available is usually suffi- ciently large to produce a catastrophic ...
... chemical reaction may be tentatively ascribed to the different amounts of energy involved in the two types of reaction . In short - wave radiation the energy made available is usually suffi- ciently large to produce a catastrophic ...
Стр. 351
... chemical work has been to the study of " exchange reactions . " In exchange experiments the atoms of an element in one of its valence forms or types of chemical combination are labeled by admixture with some radioactive isotope of the ...
... chemical work has been to the study of " exchange reactions . " In exchange experiments the atoms of an element in one of its valence forms or types of chemical combination are labeled by admixture with some radioactive isotope of the ...
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AAAS acid activity administration American animals application appointed Association atomic awarded barbiturate biological blood cancer carbon cells cent centrioles chairman chemical chemistry Chicago chromosomes clinical College Commission Committee concentration Department director disease Division Edison effect electrical energy engineering enzyme estrone experimental experiments field Foundation glycerides grams Harlow Shapley Illustrated inactivation increase industrial injection Institute investigation isotopes Kirtley F Laboratory liver material Medical Medicine meeting ment method mice mustard gas National neutrons normal nutrition observed obtained operation organization patients penicillin period physical physiology pipette plants plutonium possible present president problems production professor protein radiation radioactive rats reactions record Roger Adams sample School Science scientific scientists Service smegma Society sodium solution specific stanine streptomycin subtilin technical temperature tests thermal neutrons thiamine tion tissue treatment tube tumors University uranium vitamin Washington York zirconium