Results 31 to 40 of about 140,334 (356)
MethodsX, 2020 A quantification assay based on isotope dilution mass spectrometry to determine the concentration of progesterone in human serum was reported. Incorporated with 13C3-progesterone, serum samples were subjected to progesterone extraction and clean-up by C4
Ming-Hui Yang +5 more
doaj +1 more source
Body composition in Nepalese children using isotope dilution: the production of ethnic-specific calibration equations and an exploration of methodological issues. [PDF]
, 2015 Background. Body composition is important as a marker of both current and future health. Bioelectrical impedance (BIA) is a simple and accurate method for estimating body composition, but requires population-specific calibration equations. Objectives. (1)
Chaube, SS +8 more
core +1 more source
Fractionation of lead in soil by isotopic dilution and sequential extraction [PDF]
, 2011 ‘Reactivity’ or ‘lability’ of lead is difficult to measure using traditional methods. We investigated the use of isotopic dilution with 204Pb to determine metal reactivity in four soils historically contaminated with contrasting sources of Pb, including (
A. M. Tye +37 more
core +2 more sources
Journal of Lipid Research, 1977 Studies were carried out to assess the stability of the label in [11,12-3H2]chenodeoxycholic acid and [11,12-3H2]lithocholic acid during enterohepatic cycling and thus define the suitability of these tracers for isotope dilution studies of bile acids in ...
P Y Ng, R N Allan, A F Hofmann
doaj +1 more source
Tracking sources and fate of groundwater nitrate in Kisumu City and Kano Plains, Kenya [PDF]
, 2020 Groundwater nitrate (NO3−) pollution sources and in situ attenuation were investigated in Kisumu city and Kano plains. Samples from 62 groundwater wells consisting of shallow wells (hand dug, depth 15 m) were obtained during wet (May–July 2017) and dry ...
Boeckx, Pascal +2 more
core +1 more source
Nuclear AnalysisUranium-233 (233U) is an important synthetic isotope and used as isotope dilution references for safeguards, non-proliferation, and nuclear forensics measurements.
Yu Sun +5 more
doaj +1 more source
Streamlined approach for careful and exhaustive aroma characterization of aged distilled liquors
Food Chemistry: X, 2019 Solvent-assisted flavor evaporation (SAFE) is considered to be the best overall method to produce a “clean” aroma extract to avoid the loss of labile aroma compounds or the formation of thermally generated artifacts during gas chromatographic (GC ...
Wenqi Zhu, Keith R. Cadwallader
doaj +1 more source
Measurement of isotopically-exchangeable Zn in Zn-deficient paddy soil [PDF]
, 2015 The changes in soil chemistry following submergence of a soil for rice production result in zinc (Zn) being immobilized in very insoluble forms. Consequently, Zn deficiency is widespread in rice crops and in human populations that subsist on rice.
Atkinson +32 more
core +2 more sources
Isotope-Aided Research in Fruit and Vegetable Crops
Journal of Horticultural Sciences, 2012 In the realm of newly-emerging horticultural enterprises, some of the tracer- or isotope-related applications are highlighted here. These include root activity studies on important fruit crops using soil injection of carrier-free 32P, factors affecting ...
sS C Kotur
doaj +1 more source
Metabolites, 2022 Armodafinil, the R enantiomer of modafinil, was approved in 2007 by the US Food and Drug Administration as a wake-promoting agent for excessive sleepiness treatment.
Paulina Grocholska +2 more
doaj +1 more source