ScienceJohn Michels (Journalist) 1952 |
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Стр. 4-5
... selection is inevitably linked with both the heterogeneity of mi- crobial populations and the nature of re- sistance . Selection presupposes differences between cells , arising adaptively or by mutation . Appropri- ate use of the ...
... selection is inevitably linked with both the heterogeneity of mi- crobial populations and the nature of re- sistance . Selection presupposes differences between cells , arising adaptively or by mutation . Appropri- ate use of the ...
Стр. 4-17
... Selection practices are typical of the corn breeding procedures ( i.e. , a small number of ears are chosen to perpetuate each line selected and sister lines are discarded , by visual evaluation ) . From Table 1 it is apparent that no ...
... Selection practices are typical of the corn breeding procedures ( i.e. , a small number of ears are chosen to perpetuate each line selected and sister lines are discarded , by visual evaluation ) . From Table 1 it is apparent that no ...
Стр. 79
... selected institutions . ) rank in class . Fig . 8 gives these estimates for fresh- men . It is evident that the high - ranking fields men- tioned earlier , engineering and physical science and mathematics , still maintain considerable ...
... selected institutions . ) rank in class . Fig . 8 gives these estimates for fresh- men . It is evident that the high - ranking fields men- tioned earlier , engineering and physical science and mathematics , still maintain considerable ...
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News and Notes | 6 |
Technical Papers | 12 |
Comments and Communications | 19 |
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AAAS acid activity Agricultural allantoin American amino acid animals Annual applied appointed Association awarded Biochem Biol biological blastocyst blood Cancer carnotite catalase cells chairman Chem chemical Chemistry Chicago chlorophyll clinical colchicine College Committee compounds concentration Conference Congress cortisone culture curve Department dextran director Division Education effect engineering enzyme experimental experiments field growth helium Hospital Hotel Ibid Illus indicated injection Institute International investigation July Laboratory Manuscript received measurements Medical Research Medical Research Council Medicine ment methanol method mice midden National nicotinamide normal observed obtained organic paper penicillin physical pipettes plant polymyxin present president problems production professor protein reaction sample School Science scientific scientists Section selected Sept Society sodium solution somatotype specific SSCQT strain streptomycin Table temperature tion tissue tryptophane tube tuberculosis United University uraninite vitamin vitamin B12 volume Washington York