isotopic abundances造句

• Isotopic abundances indicate processes over the history of the Solar System.
• There is a known variation in the isotopic abundance of chlorine-37.
• It also led to explanations for the isotopic abundances of present-day planetary atmospheres.
• Isotopic abundances are different in morphine grown from poppies in South-east Asia versus poppies grown in South-West Asia.
• This full proton decoupling eliminates all coupling with H atoms and thus splitting due to H atoms in natural isotopic abundance compounds.
• Thus, the element's natural isotopic abundance is dominated either by one stable isotope or by one very long-lived isotope.
• Isotopic abundance of carbon, hydrogen, nitrogen, and oxygen isotopic abundance become locally enriched or depleted through a variety of atmospheric processes.
• Isotopic abundance of carbon, hydrogen, nitrogen, and oxygen isotopic abundance become locally enriched or depleted through a variety of atmospheric processes.
• Similarly for all practical purposes, 13 C signal splitting due to coupling with nearby natural isotopic abundance carbons is negligible in 13 C NMR spectra.
• These implementations paved the way to the spectral characterization of solid samples at natural isotopic abundance, in a manner similar to liquid-state NMR.
• However, practically all hydrogen bonded to carbon atoms is 1 H in natural isotopic abundance samples, including any 13 C nuclei bonded to H atoms.
• IUPAC is also known for standardizing the atomic weights of the elements through one of its oldest standing committees, the Commission on Isotopic Abundances and Atomic Weights.
• Isotopic abundances provide important clues to the date of events that allowed a material to begin accumulating gaseous decay byproducts, or that allowed incident radiation to begin transmuting elements.
• This allowed them to obtain high-resolution proton spectra in solids . a key step for three-dimensional structure determination of organic and inorganic materials at natural isotopic abundance.
• The upper mass limit for planethood is roughly 13 times Jupiter's mass for objects with solar-type isotopic abundance, beyond which it achieves conditions suitable for nuclear fusion.
• By studying the ratio between two isotopes of the same element, we avoid effects involving the overall abundance of the element, which usually swamp the much smaller variations in isotopic abundances.
• Since coupling between other carbons in natural isotopic abundance samples is negligible, signals in fully proton decoupled 13 C spectra in hydrocarbons and most signals from other organic compounds are single peaks.
• The intensity of the mass-spectrometry peaks is proportional to the isotopic abundances in the molecular species . 12 C 2 H 1 H 3 can also be observed with molecular weight of 17.
• As the name implies, the carbonaceous chondrites are rich in carbon, and many have anomalies in the isotopic abundances of H, C, N, and O ( Jessberger, 2000 ).
• As the name implies, the carbonaceous condrites are rich in carbon, and many have anomalies in the isotopic abundances of H, C, N, and O ( Jessberger, 2000 ).