Today's disturbance of the global carbon cycle induced by anthropogenic processes has raised new interest in the history of the global carbon cycle and its relationship to climate and other geochemical cycles. Carbon-isotope stratigraphy proves to be most useful as a monitor of the history of the...
The radioactivity due to C-14 isotope (half-life = 6000 years) of a sample of wood form an ancient tomb was found to be nearly half that of fresh wood. The bo
c-o-isotope网络碳氧同位素 网络释义 1. 碳氧同位素 氧碳同位素... ... ) carbon and oxygen isotope 碳氧同位素 ) C-O isotope 碳氧同位素 ) carbon and oxygen isotopes 碳氧同位素 ... www.dictall.com|基于2个网页© 2025 Microsoft 隐私声明和 Cookie 法律声明 广告 帮助 反馈...
Carbonate δ13C and fluid δ13C∑ C compositions of the carbonates of the QCVs of the GGF are not only distinct from the carbon isotope range of marine carbonates or meta-sedimentary carbonates of the Chitradurga schist belt, but are consistent with C-isotope values of magmatic (− 5 ± ...
To assess sources and degradation of the herbicide glyphosate [N-(phosphonomethyl) glycine] and its metabolite AMPA (aminomethylphosphonic acid), concentration measurements are often inconclusive and even 13C/12C analysis alone may give limited information. To advance isotope ratio analysis of an additi...
However, 13C isotopic enrichment analysis of these metabolites revealed less than 50% isotopic enrichment with either stable [U-13C6]glucose metabolism or [U-13C5,15N2]glutamine. This may indicate the differential account of total metabolite pool versus de novo metabolites from a 13C labeled ...
We present the first set of high-resolution, seawater Sr and C isotope curves for the late Early through early Late Cambrian. These curves are defined in continuous exposures of marine carbonates in the Great Basin and southern Canadian Rockies, and they are used to better constrain primary ...
1) C-0 isotope systematics C-0同位素体系 2) carbon isotope C同位素 例句>> 3) isotopic system 同位素体系 1. Fast neutron activation method based on the ~(40)Ar/~(39)Arisotopic systemand its application in geosciences; ~(40)Ar/~(39)Ar同位素体系及其在地学上的应用 ...
The isotope ratio was derived with the use of spectrum synthesis from the CN lines at 8004 Å. Results. We found that the 12C/13C ratio of the primary component of Capella is 17.8 ± 1.9. Our measurement precision is now primarily limited by the spectral-line data and by the ...
Compaction and collapse of structure seem to be the major visible alteration to the algal colonies. C-isotope compositions of the torbanites favour methanogenic activity. Comparison with recent botroyococcal accumulations support diagenetic alteration at a very early stage of deposition....