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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Textural and geochemical alternations in Late Cenozoic Bahamian dolomites
John M. Dawans,Peter K. Swart +1 more
TL;DR: In this paper, a core from San Salvador Island, Bahamas, exhibited variations of two texturally and geochemically distinct end-members, which may reflect originally and/or diagenetically modified depositional facies.
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Stable isotope evidence for gradual environmental changes and species survivorship across the Cretaceous/Tertiary Boundary
Enriqueta Barrera,Gerta Keller +1 more
TL;DR: In this paper, high-resolution δ13C and δ18O records have been generated from analyses of the planktonic foraminiferal species Heterohelix globulosa and the benthonic foraminiferal taxon Lenticulina spp from 3 m of a cored section spanning the Cretaceous/Tertiary (K/T) boundary at Brazos River, Texas.
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Differences in carbon isotope discrimination of three variants of D-ribulose-1,5-bisphosphate carboxylase/oxygenase reflect differences in their catalytic mechanisms.
Dennis McNevin,Dennis McNevin,Murray R. Badger,Spencer M. Whitney,Susanne von Caemmerer,Guillaume Tcherkez,Graham D. Farquhar +6 more
TL;DR: The implications of these Δ values for the Rubisco catalytic mechanism are explored and suggest that Rubiscos that are associated with a lower Δ value have a less product-like carboxylation transition state and/or allow a decar boxylation step that evolution has excluded in higher plants.
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Attenuated Glucose Production Rate in Newborn Infants of Insulin-Dependent Diabetic Mothers
TL;DR: Glucose homeostasis in such cases has been evaluated by the infant's response to exogenous glucose loads, and acute intravenous glucose loads have disappeared rapidly from blood, glucose.
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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.