Results 21 to 30 of about 6,998,665 (296)
Incorporation of oxygen-18 into nucleosides and bases
Nucleic Acids Research, 1977 Extensive incorporation of oxygen-18 at position O4 of the pyrimidine nucleus results from exchange between H218O and nucleosides or bases in 1N HC1 at 100 degrees. The reaction is hindered by substitution at C-5 with the greatest effect shown in pseudouridine (R = ribosy1) and the least in uridine (R = H).
G, Puzo, K H, Schram, J A, McCloskey
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Известия высших учебных заведений: Геология и разведка, 2018 The origin and formation of the groundwater in the Mekong Delta are the complex problem, which has not one solution nowadays. So the exploitation scheme still has many limitations.
Viet Lam Hoang Quoc +2 more
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Rangifer, 2000 An underlying assumption when estimating total energy expenditure (TEE) using doubly labelled water (DLW) is that the injected isotopes (lsO and 2H) leave the body only in the form of CO, and H20. However, both isotopes have additional routes of loss. We
Geir Gotaas +3 more
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Revisiting oxygen-18 and clumped isotopes in planktic and benthic foraminifera [PDF]
Paleoceanography and Paleoclimatology, 2023 Foraminiferal isotopes are widely used to study past oceans, with different species recording conditions at different depths. Their δ18O values record both seawater oxygen-18 and temperature according to species-specific fractionation factors, while their Δ47 signatures likely depend only on temperature.
Daëron, M., Gray, W.
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Sources of dissolved ammonia and iron in Borovnica alluvial fan groundwater
Geologija, 2014 The article deals with chemical and isotopic properties of Borovnica alluvial fan groundwater. Increased concentrations of ammonium and iron were detected in well VB-3 of the Borovnica alluvial fan pumping station. On the basis of analyses it was found
Janko Urbanc +3 more
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FAME (v1.0): a simple module to simulate the effect of planktonic foraminifer species-specific habitat on their oxygen isotopic content [PDF]
Geoscientific Model Development, 2018 The oxygen-18 to oxygen-16 ratio recorded in fossil planktonic foraminifer shells has been used for over 50 years in many geoscience applications. However, different planktonic foraminifer species generally yield distinct signals, as a consequence of ...
D. M. Roche +5 more
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Isotopic hydrograph separation in two small mountain catchments during multiple events
Cuadernos de Investigación Geográfica, 2018 Two-component isotopic hydrograph separation (IHS) was developed to determine the event- and pre-event components of a single storm event. Its application for several sucessive events requires repeated determination of isotopic signatures of end-members (
L. Holko +4 more
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Stable Isotopic Evidence of Paleorecharge in the Northern Gulf Coastal Plain (USA)
HydrologyStable isotope abundances (δ18O and δ2H) in regional aquifers can provide important paleoclimate information. However, identifying paleoclimate signals can be complicated by cross-formational mixing and, potentially, by isotopic diffusion between ...
Estifanos Haile +2 more
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Data in Brief, 2021 Oxygen-18 and deuterium were measured in streamflow samples collected from 331 gauging stations across Canada during 2013 to 2019. This dataset includes 9206 isotopic analyses made on 4603 individual water samples, and an additional 1259 analysis repeats
J.J. Gibson +5 more
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Jupiter Oxygen Corporation/Albany Research Center Crada Progress Report, September
, 2004 The Albany Research Center (ARC) has developed a new Integrated Pollutant Removal (IPR) process for fossil-fueled boilers. Pursuant to a cooperative research and development agreement (CRADA) with Jupiter Oxygen Corporation, ARC currently is studying the
Turner, Paul C. +1 more
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