Results 1 to 10 of about 104,171 (282)

Compiled records of carbon isotopes in atmospheric CO₂ for historical simulations in CMIP6 [PDF]

Geoscientific Model Development, 2017
The isotopic composition of carbon (Δ14C and δ13C) in atmospheric CO2 and in oceanic and terrestrial carbon reservoirs is influenced by anthropogenic emissions and by natural carbon exchanges, which can respond to and drive changes in climate ...
H. Graven, C. E. Allison, D. M. Etheridge, S. Hammer, R. F. Keeling, I. Levin, H. A. J. Meijer, M. Rubino, P. P. Tans, C. M. Trudinger, B. H. Vaughn, J. W. C. White   +11 more
doaj   +2 more sources

Carbon isotopes in clastic rocks and the Neoproterozoic carbon cycle [PDF]

American Journal of Science, 2020
It has been proposed that isotopically light inorganic carbon precipitated diagenetically in clastic sediments can explain the large carbon isotopic excursions recorded in Neoproterozoic carbonates.
D. Canfield, A. Knoll, S. Poulton, G. Narbonne, G. Dunning   +4 more
semanticscholar   +4 more sources

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

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

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

EXOTIC STRUCTURE OF CARBON ISOTOPES [PDF]

Frontiers of Collective Motions, 2003
31 pages, 19 eps ...
Kouichi Hagino, Toshio Suzuki, Hiroyuki Sagawa   +2 more
openaire   +3 more sources

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

The Emergence of Carbon Isotope Exchange

Angewandte Chemie International Edition, 2019
Significant progress in C-C bond activation with transition metals has recently enabled the development of several carbon isotope exchange reactions. These methods are based on C-C bond decarboxylative carboxylation reactions in the presence of selected transition metals and labelled carbon monoxide or carbon dioxide.
Hinsinger, Karen, Pieters, Gregory
openaire   +4 more sources