Results 41 to 50 of about 154,472 (297)

Detection of Epitestosterone Doping by Isotope Ratio Mass Spectrometry [PDF]

Clinical Chemistry, 2002
AbstractBackground: Epitestosterone is prohibited by sport authorities because its administration will lower the urinary testosterone/epitestosterone ratio, a marker of testosterone administration. A definitive method for detecting epitestosterone administration is needed.Methods: We developed a gas chromatography-combustion-isotope ratio mass ...
Rodrigo, Aguilera, Caroline K, Hatton, Don H, Catlin   +2 more
openaire   +2 more sources

A multi-methodological protocol to characterize PDO olive oils [PDF]

, 2018
An analytical approach including Panel Test, Isotope Ratio Mass Spectrometry (IRMS) and Nuclear Magnetic Resonance (NMR) spectroscopy was proposed to characterize Italian “Colline Pontine” PDO olive oils (40 samples) of two consecutive crop years.
Camin, Federica, Capitani, Donatella, Centauri, Luigi, Circi, Simone, Di Vecchia, Andrea, D’Achille, Giovanni, Ingallina, Cinzia, Leonardi, Genesio, Mannina, Luisa, Vista, Silvia   +9 more
core   +1 more source

Analysis of Hydrogen Isotope Abundance by High Resolution Isotope Ratio Mass Spectrometry

Zhipu Xuebao
High resolution isotope ratio mass spectrometry (HR-IRMS) is often used to measure the abundance of deuterium to verify the efficiency of isotope isolation of a cryogenic distillation column system.
Chao WU, Shi-lin HU, Ying REN, Yan LIU, Bin-yong ZHANG, Yu-fei WANG   +5 more
doaj   +1 more source

Isotope determination of sulfur by mass spectrometry in soil samples

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   +1 more source

Quantitative analysis and detection of chaptalization and watering down of wine using isotope ratio mass spectrometry

BIO Web of Conferences, 2019
In early 1990's European Union has established new isotopic approach for detection of wine authenticity. In this article we setup the possibility of using new approach using new EIM – Module – IRMS (Ethanol Isotope Measurement – Module – Isotope Ratio ...
Smajlovic I., Wang D., Túri M., Qiding Z., Futó I., Veres M., Sparks K.L., Sparks J.P., Jakšić D., Vuković A., Vujadinović M.   +10 more
doaj   +1 more source

Beryl Reference Materials for In Situ Oxygen Isotope Determination

Crystals, 2021
The mineral beryl (Be3Al2(SiO3)6) has the most abundant phase with industrial value for extracting a critical metal—beryllium. Due to multi-stage, fluid-induced growth, individual beryl grains may yield complex geochemical records, revealing variations ...
Xiaoxiao Ling, Qiuli Li, Lianjun Feng, Di Zhang, Yu Liu, Guoqiang Tang, Jiao Li, Shitou Wu, Liangliang Huang, Tiejun Li, Yan Liu, Ronald Werner, Xianhua Li   +12 more
doaj   +1 more source

Laser-induced isotopic effects in titanium resonance ionization [PDF]

, 1993
Titanium isotope ratios have been measured by resonance ionization mass spectrometry (RIMS) with special emphasis on the nature of laser-induced isotopic selectivity.
Blake, Geoffrey A., Hutcheon, I. D., Wasserburg, G. J., Wunderlich, R. K.   +3 more
core   +1 more source

Protein pyrophosphorylation by inositol pyrophosphates — detection, function, and regulation

FEBS Letters, EarlyView.
Protein pyrophosphorylation is an unusual signaling mechanism that was discovered two decades ago. It can be driven by inositol pyrophosphate messengers and influences various cellular processes. Herein, we summarize the research progress and challenges of this field, covering pathways found to be regulated by this posttranslational modification as ...
Sarah Lampe, Tanmay Kumar Mohanty, Rashna Bhandari, Dorothea Fiedler   +3 more
wiley   +1 more source

Dietary misreporting: a comparative study of recalls vs energy expenditure and energy intake by doubly-labeled water in older adults with overweight or obesity

BMC Medical Research Methodology
Background Self-report methods are widely used to assess energy intake but are prone to measurement errors. We aimed to identify under-reported, over-reported, and plausible self-reported energy intake by dietary recalls (rEI) using a standard method ...
Leinys S. Santos-Báez, Michele N. Ravelli, Diana A. Díaz-Rizzolo, Collin J. Popp, Dympna Gallagher, Bin Cheng, Dale Schoeller, Blandine Laferrère   +7 more
doaj   +1 more source

Boron isotope ratio (delta B-11) measurements in water framework directive monitoring programs: comparison between double focusing sector field ICP and thermal ionization mass spectrometry [PDF]

, 2010
International audienceThe aim of our research was to compare delta B-11 measurements performed with thermal ionization mass spectrometry (TIMS) and sector field-inductively coupled plasma-mass spectrometry (SF-ICP-MS) and evaluate the feasibility of ...
Aggarwal, Aggarwal, Aggarwal, Agnès Bregnot, Al-Ammar, Allan, Barth, Barth, Bassett, Boulyga, Chetelat, Chetelat, Coetzee, Coplen, David Widory, Demuth, Dongmei Xue, Eisenhut, Eisenhut, Emmanuelle Petelet, Encinar, Gaillardet, Gonfiantini, Gregoire, Gregoire, Gäbler, Heumann, Ishikawa, Jan Bronders, Kasemann, Komor, Kristof Tirez, Lemarchand, Mather, Pascal Boeckx, Spivack, Spivack, Tonarini, Vanhaecke, Vengosh, Weiser, Widory, Widory, Wilfried Brusten, Xue   +44 more
core   +4 more sources