scholarly journals An interannual assessment of the relationship between the stable carbon isotopic composition of ecosystem respiration and climate in a high-elevation subalpine forest

2011 ◽  
Vol 116 (G2) ◽  
Author(s):  
Diego A. Riveros-Iregui ◽  
Jia Hu ◽  
Sean P. Burns ◽  
David R. Bowling ◽  
Russell K. Monson
Keyword(s):  
Isotopic Composition ◽  
Ecosystem Respiration ◽  
Carbon Isotopic Composition ◽  
High Elevation ◽  
Subalpine Forest ◽  
Stable Carbon ◽  
Carbon Isotopic ◽  
The Relationship

New equation to decipher the relationship between carbon isotopic composition of methane and maturity of gas source rocks

2021 ◽  
Vol 64 (3) ◽  
pp. 470-493 ◽  
Author(s):  
Jianping Chen ◽  
Xulong Wang ◽  
Jianfa Chen ◽  
Yunyan Ni ◽  
Baoli Xiang ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Carbon Isotopic Composition ◽  
Source Rocks ◽  
Carbon Isotopic ◽  
Gas Source ◽  
New Equation ◽  
The Relationship

scholarly journals Stable carbon isotopic composition of light hydrocarbons and n-alkanes of condensates in the Tarim Basin, NW China

2017 ◽  
Vol 2 (3) ◽  
pp. 165-177 ◽  
Author(s):  
Shipeng Huang ◽  
Chenchen Fang ◽  
Weilong Peng ◽  
Qingchun Jiang ◽  
Ziqi Feng
Keyword(s):  
Isotopic Composition ◽  
Tarim Basin ◽  
Carbon Isotopic Composition ◽  
Stable Carbon ◽  
Light Hydrocarbons ◽  
Nw China ◽  
Carbon Isotopic

scholarly journals Isotopic composition of blood plasma carbon in patients with endocrine diseases

1993 ◽  
Vol 39 (1) ◽  
pp. 36-40
Author(s):  
A. A. Ivlev ◽  
N. P. Goncharov
Keyword(s):  
Isotopic Composition ◽  
Blood Plasma ◽  
Carbon Isotopic Composition ◽  
Mean Value ◽  
Cellular Division ◽  
Disease Heterogeneity ◽  
Clear Cut ◽  
Carbon Isotopic ◽  
Adults And Children ◽  
The Relationship

Forty-eight patients suffering from diabetes mellitus, obesity, hyper- and hypothyrosis, Icenko-Cushings disease were examined to elucidate the relationship between blood plasma carbon isotopic composition and the type of the endocrine disease. This value varied within the range of 19.7 to 24.7 , the mean value being 5 . Blood plasma carbon in the diabetics is enriched for 12C light isotope (delta-13C from 23.0 to 24.5 ) as against a similar characteristic in obese patients (delta-13C from 20.5 to 21.99 ). Patients with hypo- and hyperthyrosis and the Icenko- Cushings disease have a wider range of delta-13C values that seems to be explained by the Icenko-Cushings disease heterogeneity and the presence of biorhythms. Clear-cut isotopic differences in the blood sera of adults and children were revealed whatever the disease type, these differences indicating the changes in cellular metabolism energy in the ontogenesis. These data can be satisfactorily explained within the frames of the model of cellular division of carbon isotopes, suggested previously.

scholarly journals Environmental influences on the stable carbon isotopic composition of Devonian and Early Carboniferous land plants

2019 ◽  
Vol 531 ◽  
pp. 109100 ◽  
Author(s):  
Zhenzhu Wan ◽  
Thomas J. Algeo ◽  
Patricia G. Gensel ◽  
Stephen E. Scheckler ◽  
William E. Stein ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Environmental Influences ◽  
Carbon Isotopic Composition ◽  
Early Carboniferous ◽  
Land Plants ◽  
Stable Carbon ◽  
Carbon Isotopic

Compound-specific stable carbon isotopic composition of petroleum hydrocarbons as a tool for tracing the source of oil spills

2009 ◽  
Vol 58 (1) ◽  
pp. 114-117 ◽  
Author(s):  
Yun Li ◽  
Yongqiang Xiong ◽  
Wanying Yang ◽  
Yueliang Xie ◽  
Siyuan Li ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Petroleum Hydrocarbons ◽  
Oil Spills ◽  
Carbon Isotopic Composition ◽  
Stable Carbon ◽  
Carbon Isotopic

Developing Micro-Raman Mass Spectrometry for Measuring Carbon Isotopic Composition of Carbon Dioxide

2007 ◽  
Vol 61 (7) ◽  
pp. 701-705 ◽  
Author(s):  
Masashi Arakawa ◽  
Junji Yamamoto ◽  
Hiroyuki Kagi
Keyword(s):  
Isotopic Composition ◽  
Intensity Ratio ◽  
High Spatial Resolution ◽  
Carbon Isotopic Composition ◽  
Peak Intensity Ratio ◽  
Factors Affecting ◽  
Isotopic Compositions ◽  
Carbon Isotopic ◽  
Peak Intensity ◽  
The Relationship

We investigated the applicability of micro-Raman spectroscopy for determining carbon isotopic compositions (13C/12C) of minute CO2 fluid inclusions in minerals. This method is nondestructive and has sufficiently high spatial resolution (1 μm) to measure each fluid inclusion independently. Raman spectra of CO2 fluid have 12CO2-origin peaks at about 1285 cm−1 and 1389 cm−1 (v12− and v12+) and a 13CO2-origin peak at about 1370 cm−1 (v13+). The relationship between carbon isotopic compositions and peak intensity ratios of v12+ and v13+ was calibrated. Considering several factors affecting the peak intensity ratio, the error in obtained carbon isotopic composition was 2% (20‰). The reproducibility of the intensity ratio under the same experimental environment was 0.5% (5‰). Within these error values, we can distinguish biogenic CO2 from abiogenic CO2.

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