isotope fractionation
61Геобаротермометрия — 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) …
62Argon — This article pertains to the chemical element. For other uses, see Argon (disambiguation). Argon (pronEng|ˈɑrgɒn) is a chemical element designated by the symbol Ar. Argon has atomic number 18 and is the third element in group 18 of the periodic… …
63Chondrite — Not to be confused with Chondrodite. A specimen of the NWA 869 chondrite (type L4 6), showing chondrules and metal flakes Chondrites are stony meteorites that have not been modified due to melting or differentiation of the parent body. They… …
64Radiosurgery — This article is about the medical procedure. For the album by American rock band New Found Glory, see Radiosurgery (album). Radiosurgery Intervention CLINAC: a model of steerable linear accelerator commonly used in radiosurgery …
65Isotopes of boron — Boron (B) Standard atomic mass: 10.811(7) u Table Notes * The precision of the isotope abundances and atomic mass is limited through variations. The given ranges should be applicable to any normal terrestrial material. * Commercially available… …
66Δ18O — In geochemistry, paleoclimatology and paleoceanography δ18O is a measure of the ratio of stable isotopes 18O:16O. The definition is δ18O (in per mil) = 103 [(Rsample/Rstandard) 1] , where Rx = (18O)/(16O) is the ratio of isotopic composition of a …
67Precambrian time — Interval of geologic time from с 3. 8 billion years ago, the age of the oldest known rocks, to 544 million years ago, the beginning of the Cambrian Period. This interval represents more than 80% of the geologic record and thus provides important… …
68chemical industry — Introduction complex of processes, operations, and organizations engaged in the manufacture of chemicals and their derivatives. Although the chemical industry may be described simply as the industry that uses chemistry and… …
69Portal:Chemistry — Wikipedia portals: Culture Geography Health History Mathematics Natural sciences People Philosophy Religion Society Technology …
70Denitrification — Nitrogen cycle. Denitrification is a microbially facilitated process of nitrate reduction that may ultimately produce molecular nitrogen (N2) through a series of intermediate gaseous nitrogen oxide products. This respiratory process reduces… …
