- chemical reference substance
- Abbreviation: CRS
Универсальный русско-английский словарь. Академик.ру. 2011.
chemical reference substance
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Chemical substance — Chemical redirects here. For other uses, see Chemical (disambiguation). Steam and liquid water are two different forms of the same chemical substance, water. In chemistry, a chemical substance is a form of matter that has constant chemical… … Wikipedia
Chemical shift — In nuclear magnetic resonance (NMR) spectroscopy, the chemical shift is the resonant frequency of a nucleus relative to a standard. Often the position and number of chemical shifts are diagnostic of the structure of a molecule.[1][2][3] Chemical… … Wikipedia
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Reference ranges for blood tests — Reference ranges edit in: blood urine CSF feces Reference ranges for blood tests are sets of values used by a health professional to interpret a set of … Wikipedia
Substance abuse — Classification and external resources Comparison of the perceived harm for various psychoactive drugs from a poll among medical psychiatrists specialized in addiction tr … Wikipedia
Chemical element — The periodic table of the chemical elements A chemical element is a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus.[1] Familiar examples of … Wikipedia
chemical compound — Introduction any substance composed of identical molecules consisting of atoms (atom) of two or more chemical elements (chemical element). All the matter in the universe is composed of the atoms of more than 100 different chemical elements … Universalium
chemical element — Introduction also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed. This article considers the… … Universalium
chemical reaction — Any chemical process in which substances are changed into different ones, with different properties, as distinct from changing position or form (phase). Chemical reactions involve the rupture or rearrangement of the bonds holding atoms together… … Universalium
Reference dose — A reference dose is the United States Environmental Protection Agency s maximum acceptable oral dose of a toxic substance. Reference doses are most commonly determined for pesticides. The EPA defines an oral reference dose (abbreviated RfD) as:… … Wikipedia
