SEARCH Articles Figures Tables Biotransformations in the Preparation of Compounds Labeled with Carbon and Hydrogen Isotopes Carbon Isotope Variations and a Bold Hypothesis for Life Carbon and Nitrogen Isotopes Carbon and hydrogen isotope Carbon and nitrogen isotope analysis Carbon isotopes and their properties Isotopes carbon Isotopic carbon Percentages and carbon isotopic Preservation of Biogenic Carbon Isotopic Signals in Plio-Pleistocene Bone and Tooth Mineral Stable Carbon Isotopes and Ancient Diets