Results 1 to 10 of about 128,867 (311)

Recent developments in heterocycle labeling with carbon isotopes

Journal of labelled compounds & radiopharmaceuticals, 2018
Heterocycles play an essential role in modern pharmaceutical and agrochemical developments, representing a very common structural unit in marketed drugs. Over the 46 new drugs approved in 2017 by the FDA, 25 contain in their structure a heterocyclic core.
Antonio Del Vecchio, Gianluca Destro, Frédéric Taran, Davide Audisio   +3 more
openalex   +3 more sources

Isotope Mass Spectrometry as a Tool for Identifying Organic Tomatoes (Solanum lycopersicum L.)

Техника и технология пищевых производств, 2023
Tomatoes (Solanum lycopersicum L.) are one of the most popular vegetables in the world. These days, Russian consumers prefer tomatoes labeled as organic. However, the agricultural industry often lacks instrumental methods to confirm the organic status of
Lev A. Oganesyants, Alexander L. Panasyuk, Elena I. Kuzmina, Dmitry A. Sviridov, Mikhail Yu. Ganin, Alexei A. Sсhilkin   +5 more
doaj   +1 more source

Constraints on carbonate diagenetic fluid properties by microzone in situ analysis of carbon and oxygen isotopes: a case study of Cambrian-Ordovician, Tarim Basin

Shiyou shiyan dizhi, 2023
As an important technological measure to uncover complex sedimentary-diagenetic process, microzone in situ geochemical analysis has drawn more and more attention along with improving analytical and test levels.
Jun HAN, Donghua YOU, Yixiong QIAN, Shaofeng DONG, Shoutao PENG   +4 more
doaj   +1 more source

Application of Carbon Isotope Abundance Measurement by Mass Spectrometry in the Separation of Ethanol by Gas Diffusion Method

Journal of Isotopes, 2022
Ethanol is a feasible medium for diffusion separation of carbon isotopes. In order to obtain the separation coefficient of gas diffusion separation of ethanol, the application of elemental analysis isotope ratio mass spectrometry (EA-IRMS) to measure the
WANG Fei;PAN Jianxiong;ZHOU Mingsheng;JIANG Dongjun;LI Junjie
doaj   +1 more source

Sedimentary pyrite sulfur isotopes track the local dynamics of the Peruvian oxygen minimum zone

Nature Communications, 2021
To explore the importance of local vs. global sulfur-cycle controls on variations in pyrite sulfur isotopes, the authors couple carbon-nitrogen-sulfur concentrations and stable isotopes of sediments from the Peruvian oxygen minimum zone, identifying a ...
Virgil Pasquier, David A. Fike, Itay Halevy   +2 more
doaj   +1 more source

Stable carbon isotopic compositions of individual light hydrocarbons in the C–C range in natural gas from the Qaidam Basin, China

Energy Exploration & Exploitation, 2023
C 5 –C 7 light hydrocarbons are important components in petroleum and are extensively employed as an auxiliary approach in petroleum research. Consensus on the mechanism of light hydrocarbon generation has not yet been achieved.
Chen Zhang, Daoyong Zhang, Wenli Ma, Kefei Chen, Jing Li, Shixin Zhou   +5 more
doaj   +1 more source

Centrifugal Separation of Carbon and Chlorine Isotopes Using Freon-11 as Processing Gas

Journal of Isotopes, 2017
In order to explore the effective ways for high-abundance carbon and chlorine isotopes production, a method to acquire high-abundance carbon-12 and chlorine-35 isotopes simultaneously was presented by gas centrifugation process using Freon-11 as ...
PEI Gen;ZHOU Ming-sheng;JIANG Dong-jun
doaj   +1 more source

Inter-Laboratory Comparison of Measuring Organic Carbon and Stable Nitrogen Isotopes in Marine Sediments by Elemental Analysis-Isotope Ratio Mass Spectrometry

Yankuang ceshi, 2020
BACKGROUND Organic carbon and nitrogen stable isotopes (δ13C, δ15N) in marine sediments are used as effective indicators to trace the changes of air, temperature, precipitation and other parameters in different geological time. Elemental analysis-isotope
CHANG Wen-bo, LI Feng, ZHANG Yuan-yuan, HE Xing-liang   +3 more
doaj   +1 more source

Dry season limnological conditions and basin geology exhibit complex relationships with δ13C and δ15N of carbon sources in four Neotropical floodplains. [PDF]

PLoS ONE, 2017
Studies in freshwater ecosystems are seeking to improve understanding of carbon flow in food webs and stable isotopes have been influential in this work.
Gustavo H Zaia Alves, David J Hoeinghaus, Gislaine I Manetta, Evanilde Benedito   +3 more
doaj   +1 more source

Fingerprinting Blue Carbon: Rationale and Tools to Determine the Source of Organic Carbon in Marine Depositional Environments

Frontiers in Marine Science, 2019
Blue carbon is the organic carbon in oceanic and coastal ecosystems that is captured on centennial to millennial timescales. Maintaining and increasing blue carbon is an integral component of strategies to mitigate global warming.
Nathan R. Geraldi, Alejandra Ortega, Oscar Serrano, Peter I. Macreadie, Catherine E. Lovelock, Catherine E. Lovelock, Dorte Krause-Jensen, Dorte Krause-Jensen, Hilary Kennedy, Paul S. Lavery, Michael L. Pace, Joeri Kaal, Carlos M. Duarte   +12 more
doaj   +1 more source