Science, Том 119John 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. 30
... carbon 14 , being manufactured constantly from the nitrogen in the atmosphere through cosmic ray bombardment and assimilated as carbon dioxide by living things all during life , provides a known fraction of tagged atoms whose rate of ...
... carbon 14 , being manufactured constantly from the nitrogen in the atmosphere through cosmic ray bombardment and assimilated as carbon dioxide by living things all during life , provides a known fraction of tagged atoms whose rate of ...
Стр. 143
... carbon dioxide from limestone and juvenile carbon dioxide . The composition of juvenile carbon dioxide is not exactly known but consideration of the observed distribution of the carbon isotopes ( 1 ) and recent work on the isotopic ...
... carbon dioxide from limestone and juvenile carbon dioxide . The composition of juvenile carbon dioxide is not exactly known but consideration of the observed distribution of the carbon isotopes ( 1 ) and recent work on the isotopic ...
Стр. 506
... carbon was reported in the suggested pre - Cambrian fossil Corycium enigmaticum Sederholm , which occurs in a phyllite at Aitolahti in the Tampere schist belt , Finland . This carbon , because of its isotopic constitu- tion and geologic ...
... carbon was reported in the suggested pre - Cambrian fossil Corycium enigmaticum Sederholm , which occurs in a phyllite at Aitolahti in the Tampere schist belt , Finland . This carbon , because of its isotopic constitu- tion and geologic ...
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