polar substance
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Chromatography — Pictured is a sophisticated gas chromatography system. This instrument records concentrations of acrylonitrile in the air at various points throughout the chemical laboratory. Chromatography (from Greek χρῶμα chroma color and γράφειν graphein to… … Wikipedia
separation and purification — ▪ chemistry Introduction in chemistry, separation of a substance into its components and the removal of impurities. There are a large number of important applications in fields such as medicine and manufacturing. General principles… … Universalium
Aprepitant — drugbox IUPAC name = 5 [(2 S ,3 R ) 2 [(1 R ) 1 [3,5 bis(trifluoromethyl)phenyl] ethoxy] 3 (4 fluorophenyl)morpholin 4 yl] methyl] 1,2 dihydro 1,2,4 triazol 3 one CAS number = 170729 80 3 ATC prefix = A04 ATC suffix = AD12 ATC supplemental =… … Wikipedia
Reversed-phase chromatography — (RPC) includes any chromatographic method that uses a non polar stationary phase. The name reversed phase has a historical background. In the 1970s most liquid chromatography was done on non modified silica or alumina with a hydrophilic surface… … Wikipedia
hydrogen bond — noun Date: 1923 an electrostatic attraction between a hydrogen atom in one polar molecule (as of water) and a small electronegative atom (as of oxygen, nitrogen, or fluorine) in usually another molecule of the same or a different polar substance… … New Collegiate Dictionary
Cross-country skiing — Priit Narusk in the qualification for the Tour de Ski in Prague. Nickname(s) XC skiing Characteristics Categorization Outdoor or indoor in ski tunn … Wikipedia
hydrogen bond — n an electrostatic attraction between a hydrogen atom in one polar molecule (as of water) and a small electronegative atom (as of oxygen, nitrogen, or fluorine) in usu. another molecule of the same or a different polar substance hydrogen bonding… … Medical dictionary
hydrophilic — (hi dro fil ik) A polar substance that has a strong affinity for water (or is readily soluble in water) … Dictionary of microbiology
monomolecular film — A layer of monomolecular thickness of a polar substance spread over a free water surface to prevent evaporation … Lexicon of Cave and Karst Terminology
liquid — liquidly, adv. liquidness, n. /lik wid/, adj. 1. composed of molecules that move freely among themselves but do not tend to separate like those of gases; neither gaseous nor solid. 2. of, pertaining to, or consisting of liquids: a liquid diet. 3 … Universalium
poison — poisoner, n. poisonless, adj. poisonlessness, n. /poy zeuhn/, n. 1. a substance with an inherent property that tends to destroy life or impair health. 2. something harmful or pernicious, as to happiness or well being: the poison of slander. 3.… … Universalium
