Carbon Isotopes Journal Article 941 Research Support, Non-U.S. Gov't 612 Protons 242 Nitrogen Isotopes 177 7440-44-0 158 Carbon 158 mehr ... 142M471B3J 155 Carbon Dioxide 155 059QF0KO0R 99 Water 99 Research Support, U.S. Gov't, Non-P.H.S. 95 N762921K75 87 Nitrogen 87 7YNJ3PO35Z 80 Hydrogen 80 Soil 64 Comparative Study 54 Oxygen Isotopes 38 AR09D82C7G 36 Deuterium 36 Letter 35 Research Support, N.I.H., Extramural 30 Carbon-13 29 Evaluation Study 29 FDJ0A8596D 29 NMR 26 Amino Acids 25 Solvents 23 13C 21 weniger ...