Results 11 to 20 of about 128,867 (311)

Features and origin of oil degraded gas of Santai field in Junggar Basin, NW China

Petroleum Exploration and Development, 2015
Based on comprehensive analysis of the natural gas composition, carbon isotopes and associated oil carbon isotopes, saturated hydrocarbon chromatography, and gas chromatography-mass spectrography, the features and formation mechanisms of natural gas in ...
Jungang LU, Li WANG, Shijia CHEN, Hui HAN, Huanxu ZHANG, Youlin HUANG, Xiaobo HE, Pan ZHAN, Shiying ZHOU, Anran ZHANG, Xiaotian LI   +10 more
doaj   +1 more source

A pilot study of stable isotope fractionation in Bombyx mori rearing

Scientific Reports, 2023
Hydrogen, oxygen, carbon, and nitrogen isotopes derived from three different strains of silkworms at different life stages involved in silkworm rearing, were measured to understand the fractionation characteristics of stable isotopes at different stages ...
Hao Li, Yujie He, Jinzhong Lu, Liling Jia, Yong Liu, Dan Yang, Shuai Shao, Gang Lv, Hailiang Yang, Hailing Zheng, Yang Zhou, Zhiqin Peng   +11 more
doaj   +1 more source

Effects of Upwelling Intensity on Nitrogen and Carbon Fluxes through the Planktonic Food Web off A Coruña (Galicia, NW Spain) assessed with Stable Isotopes

Diversity, 2020
The input of new nutrients by upwelling in shelf waters, and the associated carbon and nitrogen fluxes, can be traced by their stable isotope signatures in organic matter.
Antonio Bode, Angel F. Lamas, Carmen Mompeán   +2 more
doaj   +1 more source

Exploring methane cycling in an arctic lake in Kangerlussuaq Greenland using stable isotopes and 16S rRNA gene sequencing

Frontiers in Environmental Science, 2022
Lakes are currently responsible for a significant amount of total natural methane emission. Microbial oxidation of methane plays a central role in Arctic carbon cycling, potentially reducing methane emissions from lakes, though little is known about ...
Sarah B. Cadieux, Sarah B. Cadieux, Ursel M. E. Schütte, Chris Hemmerich, Sarah Powers, Jeffrey R. White, Jeffrey R. White   +6 more
doaj   +1 more source

Research Progress on Spatiotemporal Distribution Characteristics of Carbon Stable Isotopes in Wines from New and Old World Countries [PDF]

Shipin Kexue, 2023
With the continuous development of economic globalization, the production and consumption of wine in New and Old World countries have shown a steady growth trend. Wines of different grades and styles have been developed, which are related to geographical
MA Yanfei, SU Yingyue, WANG Lishan, QI Pengyu, KANG Tianhao, WANG Li, MA Haiyan, XU Guoqian, ZHANG Ang
doaj   +1 more source

Centrifugal Separation of Carbon Isotopes Using Heptafluoropropane as Processing Gas

Journal of Isotopes, 2020
The demand for stable isotopes has increased in the field of medical diagnosis, biopharming, quantum communication and so on. Natural carbon has two stable isotopes: 12C (98.89%) and 13C (1.11%). 13C in high abundance is mainly used in tracer field.
SUN Qiming;JIAN Conghui;ZHOU Mingsheng;PEI Gen
doaj   +1 more source

Degradation changes stable carbon isotope depth profiles in palsa peatlands [PDF]

Biogeosciences, 2014
Palsa peatlands are a significant carbon pool in the global carbon cycle and are projected to change by global warming due to accelerated permafrost thaw. Our aim was to use stable carbon isotopes as indicators of palsa degradation.
J. P. Krüger, J. Leifeld, C. Alewell
doaj   +1 more source

Fatty acid stable isotopes add clarity, but also complexity, to tracing energy pathways in aquatic food webs

Ecosphere, 2021
Tracing the flow of dietary energy sources, especially in systems with a high degree of omnivory, is an ongoing challenge in ecology. In aquatic systems, one of the persistent challenges is in differentiating between autochthonous and allochthonous ...
Ariana M. Chiapella, Martin J. Kainz, Angela L. Strecker   +2 more
doaj   +1 more source

Stalagmite carbon isotopes suggest deglacial increase in soil respiration in Western Europe driven by temperature change

Climate of the Past, 2020
. The temperate region of Western Europe underwent dramatic climatic and environmental change during the last deglaciation. Much of what is known about the terrestrial ecosystem response to deglacial warming stems from pollen preserved in sediment ...
F. Lechleitner, C. Day, O. Kost, M. Wilhelm, N. Haghipour, G. Henderson, H. Stoll   +6 more
semanticscholar   +1 more source

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

, 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. Allison, D. Etheridge, S. Hammer, R. Keeling, I. Levin, H. Meijer, M. Rubino, P. Tans, C. Trudinger, B. Vaughn, J. White   +11 more
semanticscholar   +1 more source