Science, Том 109John Michels (Journalist) American Association for the Advancement of Science, 1883 Since Jan. 1901 the official proceedings and most of the papers of the American Association for the Advancement of Science have been included in Science. |
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Стр. 54
... carbon dioxide in the air is 2.04 of 1 per cent , and there is no simple way reasing this concentration in open fields . All material gets its carbon from this 0.04 per cent air . This seems to be a small source of carbon the vegetation ...
... carbon dioxide in the air is 2.04 of 1 per cent , and there is no simple way reasing this concentration in open fields . All material gets its carbon from this 0.04 per cent air . This seems to be a small source of carbon the vegetation ...
Стр. 55
... carbon di- oxide which contains radioactive carbon , the first chemicals produced in photosynthesis are identifiable by means of their radioactivity . Active and signifi- cant work is now going on with radioactive carbon ( 14 ) ...
... carbon di- oxide which contains radioactive carbon , the first chemicals produced in photosynthesis are identifiable by means of their radioactivity . Active and signifi- cant work is now going on with radioactive carbon ( 14 ) ...
Стр. 140
... carbon from carbon dioxide to the variety of plant con- stituents is relatively simple and straightforward . It would consist of feeding a photosynthesizing organism radioactive carbon dioxide for various lengths of time and stopping ...
... carbon from carbon dioxide to the variety of plant con- stituents is relatively simple and straightforward . It would consist of feeding a photosynthesizing organism radioactive carbon dioxide for various lengths of time and stopping ...
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