ScienceJohn Michels (Journalist) 1959 |
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Стр. 245
... present time , the problem of the origin of life has been one of determin- ing how the first forms of life arose , from which all the present species have evolved . This problem has received con- siderable attention in recent years ...
... present time , the problem of the origin of life has been one of determin- ing how the first forms of life arose , from which all the present species have evolved . This problem has received con- siderable attention in recent years ...
Стр. 246
... present earth was all part of the initial atmosphere or whether it has been escaping from the earth's interior in a somewhat reduced condition is not im- portant to the over - all picture . Escape of Hydrogen We have learned in recent ...
... present earth was all part of the initial atmosphere or whether it has been escaping from the earth's interior in a somewhat reduced condition is not im- portant to the over - all picture . Escape of Hydrogen We have learned in recent ...
Стр. 506
... present in the filtrate were isolated and identified by the methods described pre- viously for the isolation and identifica- tion of the a - keto acids in the casein hydrolyzates examined . a - Ketoglutaric acid was present in the ...
... present in the filtrate were isolated and identified by the methods described pre- viously for the isolation and identifica- tion of the a - keto acids in the casein hydrolyzates examined . a - Ketoglutaric acid was present in the ...
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AAAS activity Albian American amino acids angiosperms animals Association atmosphere Atomic Energy behavior biological Calif carbon cells chemical chemistry Chicago Choice Hotel chromosomes cloth mother CO₂ colchicine College complete concentration Cretaceous culture Department deposits Dept disease effect ence engineering experimental experiments field galvanic skin response glutamic acid glutamine growth imprinting indicate industrial infants Institute instrument International July Laboratory larvae mathematics measurements Medical ment method MINA REES National Natl nuclear observed oöcytes optical organic patient percent period photosynthesis physics plants present problem production professor radiation radioactive range References and Notes response royal jelly Russian samples Science scientific scientists sex chromatin Soviet space species stratosphere strontium-90 symp Table temperature tion tional tissue tive transliteration tritium troposphere tumors United Univ University volume Washington wire mother York