Results 41 to 50 of about 105,676 (166)

Differentiated Study of Constituents between Organic Milk and Ordinary Milk by Stable Isotope Ratio and UPLC-Q-Orbitrap

Shipin gongye ke-ji, 2023
Objective: To prevent some illegal companies driven by interests from arbitrarily labeling "organic" to deceive consumers using ways such as counterfeiting, forgery, and shoddy food.
Xuemei NIE, Yun XIE, Bozhou XU, Xiuli XU
doaj   +1 more source

Atomic isotopic ratio measurements

, 2023
Separating stars enriched in the s- and r-processes of nucleosynthesis is usually done by analysing element ratios of ”mainly s-process” elements (like Ba or La) to ”mainly r-process” elements (like Eu). The situation gets more complex when analysing CEMP-rs stars, which are Carbon-Enriched Metal-Poor objects enriched in a mixture of s- and r-elements.
Van Eck, , , Giribaldi, , Merle
openaire   +1 more source

The Role of Peridotite for Oceanic Volcanism

Geochemistry, Geophysics, Geosystems
The complementary products of oceanic crust formation are compositionally variable melt‐depleted peridotites. Together with the oceanic crust, the melt‐depleted peridotites are continuously recycled back into the mantle.
Andreas Stracke, Vincent J. M. Salters
doaj   +1 more source

Equations for lipid normalization of carbon stable isotope ratios in aquatic bird eggs. [PDF]

PLoS ONE, 2014
Stable isotope ratios are biogeochemical tracers that can be used to determine the source of nutrients and contaminants in avian eggs. However, the interpretation of stable carbon ratios in lipid-rich eggs is complicated because (13)C is depleted in ...
Kyle H Elliott, Mikaela Davis, John E Elliott   +2 more
doaj   +1 more source

Magnesium Isotope Ratios in Hyades Stars [PDF]

The Astrophysical Journal, 2004
ApJ in press (March 10 2004)
Yong, David, Lambert, D.L., Prieto, Carlos Allende, Paulson, D.B.   +3 more
openaire   +3 more sources

Measurement of the D/H, 18O/16O, and 17O/16O Isotope Ratios in Water by Laser Absorption Spectroscopy at 2.73 μm

Sensors, 2014
A compact isotope ratio laser spectrometry (IRLS) instrument was developed for simultaneous measurements of the D/H, 18O/16O and 17O/16O isotope ratios in water by laser absorption spectroscopy at 2.73 μm.
Tao Wu, Weidong Chen, Eric Fertein, Pascal Masselin, Xiaoming Gao, Weijun Zhang, Yingjian Wang, Johannes Koeth, Daniela Brückner, Xingdao He   +9 more
doaj   +1 more source

Combination of carbon isotope ratio with hydrogen isotope ratio determinations in sports drug testing [PDF]

Analytical and Bioanalytical Chemistry, 2013
Carbon isotope ratio (CIR) analysis has been routinely and successfully applied to doping control analysis for many years to uncover the misuse of endogenous steroids such as testosterone. Over the years, several challenges and limitations of this approach became apparent, e.g., the influence of inadequate chromatographic separation on CIR values or ...
Piper, Thomas, Emery, Caroline, Thomas, Andreas, Saugy, Martial, Thevis, Mario   +4 more
openaire   +4 more sources

Lead Isotope Ratio Measurements for Source Identification Using Samples from the UK Heavy Metals Air Quality Monitoring Network

Atmosphere
Lead isotope ratios vary depending on the origin of the lead, meaning that characteristic isotopic signatures can be used for source identification in environmental samples.
Emma C. Braysher, Jody H. L. Cheong, David M. Butterfield, Andrew S. Brown, Richard J. C. Brown   +4 more
doaj   +1 more source

Turnover of brain DHA in mice is accurately determined by tracer-free natural abundance carbon isotope ratio analysis

Journal of Lipid Research, 2020
The brain is highly enriched in the long-chain omega-3 (n-3) PUFA DHA. Due to the limited capacity for local DHA synthesis in the brain, it relies on a continual supply from the circulation to replenish metabolized DHA.
R.J. Scott Lacombe, Chi-Chiu Lee, Richard P. Bazinet   +2 more
doaj   +1 more source

Precise Measurement of Tellurium Isotope Ratios in Terrestrial Standards Using a Multiple Collector Inductively Coupled Plasma Mass Spectrometry

Molecules, 2020
Precise tellurium (Te) isotope ratio measurement using mass spectrometry is a challenging task for many decades. In this paper, Te isotope ratio measurements using multi-collector inductively coupled plasma mass spectrometry (MC–ICP–MS) in terrestrial Te
Rajamanickam Murugan, Tatsuo Aono, Sarata Kumar Sahoo   +2 more
doaj   +1 more source