isotopic
91Isotope ratio mass spectrometry — Infobox chemical analysis name = Isotope ratio mass spectrometry caption =Isotope ratio mass spectrometer with gas bench in foreground acronym = IRMS classification =mass spectrometry analytes = manufacturers = related = Accelerator mass… …
92Kinetic isotope effect — The kinetic isotope effect (KIE) is the ratio of reaction rates of two different isotopically labeled molecules in a chemical reaction. It is also called isotope fractionation, although this term is somewhat broader in meaning. A KIE involving… …
93Monoisotopic mass — This article is about the mass spectrometry term. For a list of monoisotopic elements, see stable isotope. The monoisotopic mass is the sum of the masses of the atoms in a molecule using the unbound, ground state, rest mass of the principal (most …
94Pleistocene Epoch — Earlier and longer of the two epochs that constitute the Quaternary Period. The Pleistocene began с 1.8 million years ago and ended с 10,000 years ago. It was preceded by the Pliocene Epoch of the Tertiary Period and followed by the Holocene… …
95Фракционирование химических элементов в земной коре — Возможно, эта статья содержит оригинальное исследование. Добавьте ссылки на источники, в противном случае она может быть выставлена на удаление. Дополнительные сведения могут быть на странице обсуждения. (11 мая 2011) …
96Molecular mass — This article is about the mass of a single molecule. For the mass of a substance commonly used in basic stoichiometric calculations, see Molar mass. Assuming hydrogen and oxygen are standard weights in this image (as opposed to deuterium oxide)… …
97Superior craton — in the west. The western margin extends from northern Minnesota through eastern Manitoba to northwestern Ontario.The formation of the Superior craton is best explained within the context of 2.72 2.68 Ga accretion of small continental plates and… …
98Extraterrestrial materials — Most atoms on earth came from the interstellar dust and gas from which the sun and solar system formed. However, in the space science community extraterrestrial materials generally refers to objects now on earth that were solidified prior to… …
99mass spectrometry — or mass spectroscopy Analytic technique by which chemical substances are identified by sorting gaseous ions by mass using electric and magnetic fields. A mass spectrometer uses electrical means to detect the sorted ions, while a mass spectrograph …
100Presolar grains — are isotopically distinct clusters of material found in the fine grained matrix of primitive meteorites, whose differences from the surrounding meteorite suggest that they are older than the solar system [Maria Lugaro (2005) Stardust from… …
