Natural-abundance 13C NMR spectra (at 15.04 MHz) of the polypeptide cardiac stimulant Anthopleurin-A are presented. The spectra contain many resolved one- and two-carbon resonances from carbonyl and aromatic carbons and a few resolved resonances from aliphatic carbons. Most of these have been ...
Kempsell, Natural abundance carbon-13-carbon-13 coupling observed via double-quantum coherence, J. Am. Chem. Soc. 102 (1980) 4849-4851.Bax A.; Freeman R.; Kempsell S.P. (1980).Natural-abundance 13C-13C coupling observed via double-quantum coherence, Journal of the American Chemical ...
Soil respiration from a boreal mixed coniferous forest showed large seasonal variation in natural abundance of 13C, ranging from –21.6‰ to R
or in the chemical-shift sense (different nuclear) shieldings).2 While both isochronous and anisochronous magnetic non-equivalence have been thoroughly documented in 1H- and 19F-nuclear magnetic resonance studies,1, 2 reported examples from natural abundance 13C-magnetic resonance (cmr) spectra are...
Studies carbon turnover and carbon-13 natural abundance in organo-mineral fractions of a tropical dry forest soil with sorghun under cultivation. Use of various physical fractionation methods to obtain the soil organic matter (SOM) fractions; Distribution of soil organic carbon...
Lilienfein, Soil carbon-13 natural abundance under native and managed vegetation in Brazil, Soil Sci. Soc. Am. J. 68 (2004) 827e832.WILCKE, W.; LILIENFEIN, J. Soil carbon-13 natural abundance under native and managed vegetation in Brazil. Soil Science Society of America Journal, Madison...
摘要: Examines the possible relationship between salinity stress and natural abundance of carbon and nitrogen on a Lethent Clay Loam in California. Collection of soil and crop samples; Correlation of crop stress with soil salinity; Use of the primary enzyme for carbon dioxide fixation....
摘要: Examines the possible relationship between salinity stress and natural abundance of carbon and nitrogen on a Lethent Clay Loam in California. Collection of soil and crop samples; Correlation of crop stress with soil salinity; Use of the primary enzyme for carbon dioxide fixation....
The low (1.1%) natural abundance of 13C often requires administration of supplementary labeled compounds to obtain adequate signal strength. Only certain storage compounds that are rich in carbon, such as triacylglycerols or glycogen, can be directly detected by 13C MRS unless small-bore and high...
Bax A, Freeman R, Frenkiel T A 1981 An NMR technique for tracing out the carbon skeleton of an organic molecule. J Am Chem Soc 103: 2102–2104 Article CAS Google Scholar Bax A, Freeman R, Kempsell S P 1980 Natural abundance 13C-13C coupling observed via double- quantum coherence. ...