Carbon-13 (13C) is a natural, stable isotope of carbon with a nucleus containing six protons and seven neutrons. As one of the environmental isotopes...

magnetic resonance (most commonly known as carbon-13 NMR spectroscopy or 13C NMR spectroscopy or sometimes simply referred to as carbon NMR) is the application...

1H—13C and 1H—31P. The basic scheme of this experiment involves the transfer of magnetization on the proton to the second nucleus, which may be 15N, 13C...

Bruck R, Niv Y, et al. (2001). "Evaluation of a novel continuous real time 13C urea breath analyzer for Helicobacter pylori". Aliment. Pharmacol. Ther....

isotopic signature, a measure of the ratio of the two stable isotopes of carbon—13C and 12C—reported in parts per thousand (per mil, ‰). The measure is also...

This list of Thomist writers runs from the 13th to the 18th century, stopping short of neo-Thomism. It includes writers who engaged with the thought of...

Hot Bird 13C, formerly Hot Bird 9, is a communications satellite operated by Eutelsat, launched 20 December 2008 aboard an Ariane 5ECA carrier rocket...

abundant 12C isotope does not produce any signal whereas the comparably rare 13C isotope is easily detected. As a result, carbon isotopomers of a compound...

product. Organic carbon contains less of the stable isotope Carbon-13, or 13C, relative to the initial inorganic carbon from the atmosphere or water because...

C–2H bond, whereas a 12C reaction is only 4% faster than the corresponding 13C reaction;: 445  even though, in both cases, the isotope is one atomic mass...

containing the 15N nucleus. 15N NMR differs in several ways from the more common 13C and 1H NMR. To circumvent the difficulties associated with measurement of...

atoms have 13C nuclei, which do show signals in 13C NMR spectroscopy and do couple with other active nuclei such as 1H. Since the percentage of 13C is so low...

is the accepted internal standard for calibrating chemical shift for 1H, 13C and 29Si NMR spectroscopy in organic solvents (where TMS is soluble). In...

link three types of atomic nuclei, most typically consisting of 1H, 15N and 13C. These experiments are often used to assign specific resonance signals to...

the result of 1% of the 1H atoms coupling to an adjoined 13C atom to give a wide doublet (13C has a spin of a half). Note, if the main 1H-peak has proton-proton...

this orbital position. From March 2012, Hot Bird 9 became Eutelsat Hot Bird 13C and during the second quarter of 2023 Hot Bird 13G replace Hot Bird 9 at...

Theophylline, also known as 1,3-dimethylxanthine, is a drug that inhibits phosphodiesterase and blocks adenosine receptors. It is used to treat chronic...

A metallocene is a compound typically consisting of two cyclopentadienyl anions (C 5H− 5, abbreviated Cp) bound to a metal center (M) in the oxidation...

Onsight Free Solo (5.8) 2015 − Free Ascent of the Muir Wall on El Capitan (5.13c) 2016 − Mount Tuzo, Canadian Rockies – Northeast Face (M7+ WI6+R, 1,110 meters)...

marked by a brief period in which the concentration of the carbon isotope 13C in the atmosphere was exceptionally low in comparison with the more common...

396 at 25 °C. The pKa of the hydroxyl group has been found, by means of 13C NMR spectroscopy, to be 14.4. The speciation diagram shows that solutions...

El Capitan, and Half Dome, Yosemite – Solo in 18:50 2014, Pre Muir (V 5.13c/d), Yosemite, El Capitan 2014, Muir Wall – Shaft Variation (V 5.13b/c), Yosemite...

manner. Examples include any nuclei X{Y} or X→Y such as 1H→13C, 19F→13C, 31P→13C, or 77Se→13C. The experiments typically observe NOEs from protons on X...

spectra, 1H nuclear magnetic resonance (1H-NMR) spectra, 13C nuclear magnetic resonance (13C-NMR) spectra and electron paramagnetic resonance (EPR) spectra...

(abbreviated as 12C) or the less common 13C isotope. Compared to natural diamonds that are composed of a mixture of 12C and 13C isotopes, isotopically pure diamonds...

spectroscopy is generally not useful for establishing the presence of a ketone, 13C NMR spectra exhibit signals somewhat downfield of 200 ppm depending on structure...

defined as 0.95 times the 14C concentration of this material, adjusted to a 13C reference value of −19 per mil (PDB). This value is defined as "modern carbon"...

separate compound and later esterified to monic acid to form pseudomonic acid. 13C labeled acetate feeding has shown that C1-C6 are constructed with acetate...

Eugene Register-Guard. Oregon. Los Angeles Times. October 18, 1986. p. 13C. "Demond Wilson". Triviatribute.com. Retrieved October 26, 2021. "Demond...

resonances depending on surrounding atoms, generally a downfield shift. The 13C NMR of a carbonyl carbon is in the range of 160–220 ppm. Carbon–oxygen bond...