Results 21 to 30 of about 330,072 (330)
Molbank, 2022 We herein report on the synthesis of a pentacyclic triterpene functionalized through derivation of betulinic acid with hydroxybenzotriazole. The compound was fully characterized by proton (1H-NMR), carbon-13 (13C-NMR), heteronuclear single quantum ...
Ai Jiang +6 more
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13C-NMR and mass spectral data of steroids with a 17,17-dialkyl-18-nor-13(14)-ene substructure
Journal of Lipid Research, 1997 We present carbon-13 nuclear magnetic resonance (13C-NMR) and mass spectral data for several androstanes and estranes having a 17,17-dialkyl-18-nor-13(14)-ene substructure. These compounds are formed by a Wagner-Meerwein rearrangement of steroids bearing
V I De Brabandere +3 more
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NMR “Finger Prints” of N-Heterocyclic Carbenes, DFT Analysis: Scopes and Limitations
Molecules, 2023 The scopes and limitations of theoretical methods for estimating various NMR metrics of NHCs are considered on a wide range of model NHCs and their derivatives, using a number of computational approximations.
Svetlana A. Kondrashova +1 more
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OENO One, 1996 Despite both the low sensitivity and abundance of the carbon 13 nuclei, 13C NMR spectroscopy was shown to be an excellent quantitative analytic method for the main components of the wines.
C. Chon, Alain Poulard, Claude Rabiller
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Partial (13)C isotopic enrichment of nucleoside monophosphates: useful reporters for NMR structural studies [PDF]
, 2005 Analysis of the (13)C isotopic labeling patterns of nucleoside monophosphates (NMPs) extracted from Escherichia coli grown in a mixture of C-1 and C-2 glucose is presented. By comparing our results to previous observations on amino acids grown in similar
Kishore, Anita I. +2 more
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Ionization behavior of aqueous short-chain carboxylic acids: a carbon-13 NMR study.
Journal of Lipid Research, 1982 The 13C chemical shift of each carbon of aqueous acetic, propionic, and butyric acids has been measured as a function of pH or of added equivalents of base.
D P Cistola, D M Small, J A Hamilton
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Crystals, 2020 Benzylsulfanyl-triazolyl-indole scaffold was synthesized through coupling of 4-amino-5-(1H-indol-2-yl)-1,2,4-triazol-3(2H)-thione and benzyl bromide in EtOH under basic conditions (K2CO3).
Ahmed T. A. Boraei +3 more
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Experimental Heat-Bath Cooling of Spins [PDF]
, 2014 Algorithmic cooling (AC) is a method to purify quantum systems, such as ensembles of nuclear spins, or cold atoms in an optical lattice. When applied to spins, AC produces ensembles of highly polarized spins, which enhance the signal strength in nuclear ...
Brassard, Gilles +7 more
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Agronomy, 2019 Biochar has been shown as a potential mean to enhance carbon sequestration in the soil. In Brazil, approximately 15% of the produced charcoal is discarded as charcoal fines, which are chemically similar to biochar.
Otávio dos Anjos Leal +6 more
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Mapping soil organic carbon under erosion processes using remote sensing
Hungarian Geographical Bulletin, 2021 This study aimed to map soil organic carbon under erosion processes on an arable field in the Republic of Bashkortostan (Russia). To estimate the spatial distribution of organic carbon in the Haplic Chernozem topsoil, we applied Sentinel-2A satellite ...
Azamat Suleymanov +5 more
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