منابع مشابه
Oxygen and Hydrogen Isotope Ratios of Water from Photosynthetic Tissues of CAM and C(3) Plants.
Water samples from photosynthetic tissues of C(3) and Crassulacean acid metabolism (CAM) plants that grew together in the field were extracted and the stable oxygen and hydrogen isotope ratios determined. During the day, (18)O/(16)O and deuterium/hydrogen (D/H) ratios of water from CAM plants were lower than those observed in water from C(3) plants. The patterns of diurnal variation (or lack th...
متن کاملCarbon, hydrogen, and oxygen isotope ratios of cellulose from plants having intermediary photosynthetic modes.
Carbon and hydrogen isotope ratios of cellulose nitrate and oxygen isotope ratios of cellulose from species of greenhouse plants having different photosynthetic modes were determined. When hydrogen isotope ratios are plotted against carbon isotope ratios, four clusters of points are discernible, each representing different photosynthetic modes: C(3) plants, C(4) plants, CAM plants, and C(3) pla...
متن کاملOxygen Isotope Ratios in the Crust of Iron Meteorites
The separation factor, aM-0= ( 1 8 0 / 1 6 0 ) magnetite/' ( 1 8 0 / 1 6 0 ) atmospheric oxygen, between the magnetite crust of iron meteorites and atmospheric oxygen has been determined to be 0.9946 ± 0.0005. It is concluded that this fractionation of the oxygen isotopes is the consequence of an equilibrium isotope effect at high temperatures. It can be assumed that this is also valid for cosm...
متن کاملIsotope ratios of cellulose from plants having different photosynthetic pathways.
Hydrogen and carbon isotope ratios of cellulose nitrate and oxygen isotope ratios of cellulose from C(3), C(4), and Crassulacean acid metabolism (CAM) plants were determined for plants growing within a small area in Val Verde County, Texas. Plants having CAM had distinctly higher deuterium/hydrogen (D/H) ratios than plants having C(3) and C(4) metabolism. When hydrogen isotope ratios are plotte...
متن کاملHydrogen and oxygen isotope ratios in body water and hair: modeling isotope dynamics in nonhuman primates.
The stable isotopic composition of drinking water, diet, and atmospheric oxygen influence the isotopic composition of body water ((2)H/(1)H, (18)O/(16)O expressed as δ(2) H and δ(18)O). In turn, body water influences the isotopic composition of organic matter in tissues, such as hair and teeth, which are often used to reconstruct historical dietary and movement patterns of animals and humans. H...
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ژورنال
عنوان ژورنال: Nature
سال: 1984
ISSN: 0028-0836,1476-4687
DOI: 10.1038/310166a0