ScienceJohn Michels (Journalist) 1953 |
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Стр. 50
... organisms infective for guinea pigs . In determining the number of rickettsiae necessary to infect eggs , the lowest number of organisms was selected that when injected into chick embryos gave positive microscopic rickettsial smears ...
... organisms infective for guinea pigs . In determining the number of rickettsiae necessary to infect eggs , the lowest number of organisms was selected that when injected into chick embryos gave positive microscopic rickettsial smears ...
Стр. 260
... organisms against other organisms that led me in 1939 to undertake a systematic study of their ability to produce antibio- tics . Between 1940 and 1952 we isolated in our labora- tories 10 different chemical substances from cultures of ...
... organisms against other organisms that led me in 1939 to undertake a systematic study of their ability to produce antibio- tics . Between 1940 and 1952 we isolated in our labora- tories 10 different chemical substances from cultures of ...
Стр. 261
... organisms , such as the mycobacteria , or only upon certain fungi , such as yeast - like forms , or upon certain viruses , such as the influenza B types ; others had a much wider spectrum , being active upon both bacteria and fungi or ...
... organisms , such as the mycobacteria , or only upon certain fungi , such as yeast - like forms , or upon certain viruses , such as the influenza B types ; others had a much wider spectrum , being active upon both bacteria and fungi or ...
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News and Notes | 38 |
21 | 40 |
A Quantitative Analysis of the Factors Involved in | 49 |
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AAAS acid activity American animals antibiotics application Association Atomic auxin awarded bacteria Bentley Glass Biochem Biol biological blood Cancer cells Chem chemical Chemistry chlordane coal balls College Committee compounds Conference Congress culture Department determined Director Division dose effect electric electron Engineering enzyme experimental experiments fellowships field genetic glucose glucuronic acid grant growth heptachlor hyaluronidase Ibid Illus injected Institute International investigations laboratory larvae magnetic magnetic moment Manuscript received material Medical Medicine ment methionine method mice National normal nuclear nucleons observed obtained organisms paper phenylalanine Physics Physiology plants present President problems production Professor progesterone protein radiation rats reaction reported samples School Science scientific scientists Sept serum silica Society solution strains streptomycin sucrose Sulcia Table techniques temperature thiamine tion tissue tube tumor Univ University virus Washington York