Journal ArticleDOI
Isotopic standards for carbon and oxygen and correction factors for mass-spectrometric analysis of carbon dioxide
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TLDR
In this paper, Niee's and Solenhofen standards were compared to the Chicago PDB standard for carbon and oxygen isotope ratios, and the correction factors for instrumental effects and for the nature of the mass spectra were derived.About:
This article is published in Geochimica et Cosmochimica Acta.The article was published on 1957-01-01. It has received 4071 citations till now. The article focuses on the topics: Carbon & Carbon dioxide.read more
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Carbon isotope composition of various tissues of beech (Fagus sylvatica) regeneration is indicative of recent environmental conditions within the forest understorey
TL;DR: In this article, the effects of local climate and canopy thinning on the carbon isotope composition (δ13C) signatures of different plant groups in the understorey of a beech (Fagus sylvatica) forest in southern Germany was also studied.
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Dissolved organic matter in anoxic pore waters from Mangrove Lake, Bermuda
TL;DR: In this article, the role of pore water in the early diagenesis of organic matter was investigated in anoxic pore waters from Mangrove Lake, Bermuda sediments and the results indicated that this material has a predominantly polysaccharide-like structure and in addition contains a large amount of oxygen-containing functional groups.
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Estimating net primary production from measurements made on soil organic matter
D. S. Jenkinson,D. S. Jenkinson,J. Meredith,Jenesio I. Kinyamario,G. P. Warren,Mike Wong,D. D. Harkness,Roland Bol,Kevin Coleman +8 more
TL;DR: In this article, a model for the turnover of organic matter in soil, ROTHC-26.3, is used to calculate how much organic C needs to enter a soil annually in order to maintain a specified stock of soil organic C. The annual return of organic C thus calculated, plus the amount of organic c removed annually from the site by harvesting, burning, etc., provides an estimate of the Net Primary Production (NPP) of that site, averaged over many years.
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Authigenic carbonates from methane seeps of the Congo deep-sea fan
Catherine Pierre,Yves Fouquet +1 more
TL;DR: In this article, the authors used the ROV Victor 6000 to explore the seafloor of the Congo deep-sea fan and found that diagenetic carbonates are active venting sites of methane-rich fluids, associated with abundant fauna and carbonate crusts.
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Substrate Metabolism and Exercise Performance with Caffeine and Carbohydrate Intake
TL;DR: The coingestion of caffeine with CHO during exercise enhanced TT performance by 4.6% compared with CHO and 9.0%" compared with water placebo, however, caffeine did not influence exogenous CHO oxidation or glucose kinetics during SS exercise.
References
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Journal ArticleDOI
On the Isotopic Chemistry of Carbonates and a Paleotemperature Scale
TL;DR: In this paper, the temperature variation of the fractionation of oxygen in exchange reactions between dissolved carbonate and water and between calcite and water was calculated on theoretical grounds, and checked experimentally.
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Variation of O18 content of waters from natural sources
S Epstein,Toshiko K. Mayeda +1 more
TL;DR: A number of marine water and fresh water samples were examined for the relative O18O16 ratio, and the variation of this ratio was determined to a precision of ± 1% as mentioned in this paper.
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Revised carbonate-water isotopic temperature scale
TL;DR: The relationship between temperature and O(18) content relative to that for a Cretaceous belemnite of the Pee Dee formation previously reported (Epstein, Buchsbaum, Lowenstam, and Urey, 1951) has been re-determined using modified procedures for removing organic matter from shells, and is found to be 16.5 - 4.3 δ + 0.14 δ^2
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The geochemistry of the stable carbon isotopes
TL;DR: A survey of the variation of the ratio C13/C12 in nature can be found in this paper, where Urey and his co-workers used two complete feed systems with magnetic switching to determine small differences in isotope ratios between samples and a standard gas.