Results 51 to 60 of about 831,647 (217)

Determination of Benzoic Acid and Benzyl Alcohol in E-Liquids (JUUL^™ Pods) by Isotopic Dilution High-Performance Liquid Chromatography and Tandem Mass Spectrometry. [PDF]

Contrib Tob Nicotine Res, 2021
Cardenas RB, Watson C, Valentin-Blasini L.   +2 more
europepmc   +1 more source

Synthesis of 11, 12-2H2- and 11, 12-3H2-labeled chenodeoxycholic and lithocholic acids

Journal of Lipid Research, 1976
Deuterium- and tritium-labeled chenodeoxycholic acid and lithocholic were prepared by catalytic reduction of their respective Δ11 derivatives. Structures of the intermediates and their isotopic purity were verified by chemical ionization and electron ...
A E Cowen, A F Hofmann, D L Hachey, P J Thomas, D T Belobaba, P D Klein, L Tökes   +6 more
doaj   +1 more source

Effects of Breastfeeding on Maternal Body Composition in Moroccan Lactating Women during Twelve Months after Birth Using Stable Isotopic Dilution Technique. [PDF]

Nutrients, 2021
Rabi B, Benjeddou K, Idrissi M, Rami A, Mekkaoui B, El Hamdouchi A, Benkirane H, Barkat A, Saeid N, El Kari K, Aguenaou H.   +10 more
europepmc   +1 more source

A simplified method for synthesizing juvenile hormone-protein conjugates.

Journal of Lipid Research, 1990
A convenient and simple method is presented for the synthesis of juvenile hormone-thyroglobulin conjugates. Methods previously described for this hapten linkage have used a two-step process in which a reactive intermediate was isolated and then used for ...
WG Goodman
doaj   +1 more source

Isotope determination of sulfur by mass spectrometry in soil samples Determinação isotópica de enxofre por espectrometria de massas (irms) em amostras de solo

Revista Brasileira de Ciência do Solo, 2012
Sulphur plays an essential role in plants and is one of the main nutrients in several metabolic processes. It has four stable isotopes (32S, 33S, 34S, and 36S) with a natural abundance of 95.00, 0.76, 4.22, and 0.014 in atom %, respectively. A method for
Alexssandra Luiza Rodrigues Molina Rossete, Josiane Meire Toloti Carneiro, Carlos Roberto Sant Ana Filho, José Albertino Bendassolli   +3 more
doaj  

Biological Nitrogen Fixation by Local and Improved Genotypes of Cowpea in Burkina Faso (West Africa): Total Nitrogen Accumulated can be used for Quick Estimation

Advances in Agriculture, 2018
Biological nitrogen fixation (BNF) by legumes is an indicator of their potential contribution to recycling nitrogen in cropping systems. Many techniques exist for the quantitative measurement of legume BNF. The isotopic dilution (ID) methods are the most
Boubié Vincent Bado, Michel Sedogo, François Lompo, Sanoussi Manzo Maman Laminou   +3 more
doaj   +1 more source

Die Anwendung radiochemischer Analysenmethoden zur Bestimmung von Zink- und Calciumspuren in Gallium

CHIMIA, 1961
The method ot thermal neutron activation analysis has been utilized for the determination of calcium and zinc traces in metallic gallium. This method allows to measure amounts of calcium as low as one p.p.m.
Pierre Lerch, Leo Kreienbühl
doaj   +1 more source

Calibration of Sm-Nd mixed spike by teflon powder method

Journal of Analytical Science and Technology, 2010
Isotopic composition of Sm-Nd mixed spike was calibrated by teflon powder method. Sm and Nd isotopic compositions of the spike were externally calibrated with reference to the nNdβ standard and normal Sm.
Chang-Sik Cheong, Sung-Tack Kwon
doaj  

Isotope dilution challenge [PDF]

Analytical and Bioanalytical Chemistry, 2014
openaire   +2 more sources

Phosphorus isotopic evaluation of a Red Ferralitic soil under various fertilization systems

Nucleus, 2017
Soil samples from a red ferralitic soil from the “Juan Tomás Roig” Experimental Station, belonging to Ciego de Avila University were analyzed under two crop rotations and four phosphoric fertilization systems.
Ricardo M. Rodríguez Guzmán
doaj