Isotopic fractionation
Isotopic fractionation of zirconium during magmatic differentiation and the stable isotope composition of the silicate Earth
... resulting isotopic fractionation being roughly proportional to the bond stiff- ness between the two equilibrated phases, with the heavier isotopes being concentrated where bond stiffness is greatest ...
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Diet effect on nitrogen partitioning and isotopic fractionation (δ15N) in ruminants
... N isotopic fractionation could potentially be used to quantify N partitioning of ...N isotopic fractionation as a simple indicator of N ...
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Oxygen Isotopic Fractionation in the Kaolinite Water System during the Synthetic Process
... calculating isotopic fractionation factors has been described and summary ...calculate fractionation factors for clay-water ...isotope fractionation factors at low temperatures between ...
10
Nitrogen isotopic fractionation and nitrogen use efficiency in beef and dairy cattle
... N isotopic fractionation, which is related to the underlying N metabolism and cycling, is introduced as an alternative method for predicting feed and N efficiency in ...
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Prediction of equilibrium isotopic fractionation of the gypsum/bassanite/water system using first principles calculations
... of isotopic fractionation are particularly useful in systems that are difficult to characterize experimentally, or when empirical data are rare or absent (Richet et ...which fractionation factors can ...
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Negligible isotopic fractionation of nitrogen within temperate Zostera spp meadows
... significant isotopic fractionation (Cook et ...minimal fractionation during ...the isotopic signature of the seagrass tissue reflected the isotopic signature of pore- water NH + 4 ...
10
The effects of dietary nitrogen to water-soluble carbohydrate ratio on isotopic fractionation and partitioning of nitrogen in non-lactating sheep
... N isotopic fractionation as an indicator of N parti- tioning for non-lactating sheep offered three levels of N/WSC in the diet, and to examine the effect of dietary N/WSC on N ...
6
Technical note: The silicon isotopic composition of choanoflagellates: implications for a mechanistic understanding of isotopic fractionation during biosilicification
... the fractionation factor (ε), it is possible to calculate past surface DSi utilisation (and so, diatom productivity) from the isotopic composition of the ...in isotopic behaviour (Sutton et ...ent ...
9
A model of mercury cycling and isotopic fractionation in the ocean
... of isotopic fractionations on the global mean sea surface isotopic signatures of the Hg species in the model, for preanthropogenic steady ...state. Fractionation epsilon values are shown in red, ...
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Perturbing phytoplankton: response and isotopic fractionation with changing carbonate chemistry in two coccolithophore species
... stable isotopic composition of organic matter and carbonate produced by two contrasting species of coccol- ithophore (Gephyrocapsa oceanica and Coccolithus pelagi- cus ...carbon isotopic ...
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Carbon isotopic fractionation in eider adipose tissue varies with fatty acid structure: implications for trophic studies
... carbon isotopic fractionation in non-essential amino acids between diet and muscle tissue in a fish species, but practically no fractionation of essential amino acids (McMahon et ...differential ...
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Isotopic fractionation of carbon during uptake by phytoplankton across the South Atlantic subtropical convergence
... and isotopic measurements Samples were collected onboard the RRS James Cook be- tween December 2011 and February 2012 (JC068), as part of the GEOTRACES A10 transect of the South ...
15
Isotopic fractionation in sputtering
... The light isotope of Mo is found to suffer a 53±5% 0 note: 1.0 %o =0.1% enrichment in the sputtered flux in the near normal direction, compared to the steady state near normal sputtered [r] ...
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Physiological and environmental controls on the nitrogen and oxygen isotope fractionation of nitrate during its assimilation by marine phytoplankton
... and isotopic composition needed to develop a quantitative understanding of the physiology underlying isotopic fractionation during nitrate ...
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Determination of Isotopic Composition and Concentration of Uranium and Boron by Thermal Ionization Mass Spectrometric Isotopic Dilution Technique
... For isotopic analysis of boron which is performed with thermionic mass spectrometer, precise value maintenance of filament current is essential to produce a stable intense peak and to avoid or minimize the ...
6
Copper isotope evidence for large scale sulphide fractionation during Earth’s differentiation
... Choosing samples to constrain the Cu isotope composition of BSE is not trivial, due to the specific behaviour of Cu during mantle melting. The concentra- tion of Cu in a mantle melt is predominantly controlled by the ...
20
Physiological and environmental controls on the nitrogen and oxygen isotope fractionation of nitrate during its assimilation by marine phytoplankton
... N isotopic fractionation greater than 1 for both ...for isotopic fractionation during nitrate assimilation where the isotope effect associated with intracellular nitrate reductase is high, the ...
9
Large-volume air sample system for measuring 34S∕32S isotope ratio of carbonyl sulfide
... For this study, we developed a new OCS sampling and pu- rification system. OCS is extracted from 500 L of ambi- ent air with a collection efficiency of almost over 95 % of OCS. The blank of the sampling and purification ...
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Boron isotope geochemistry in the sedimentary environment
... Although the bulk of the oilfield brines from Heletz have a marine signature (Na/Cl ratios and S ^ B values), small but significant additional variations can be identified: low-salinity (TDS) brines are associated with ...
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Noble Gas Constraints on the Origin and Evolution of Earth’s Volatiles
... important isotopic fractionation of the xenon also has also to be addressed ...the isotopic composition in Archean rocks is accompanied by large uncertainties ...important isotopic ...
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