quaternary salt
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Quaternary ammonium cation — Quaternary ammonium cations, also known as quats, are positively charged polyatomic ions of the structure NR4+ with R being alkyl groups. Unlike the ammonium ion NH4+ itself and primary, secondary, or tertiary ammonium cations, the quaternary… … Wikipedia
Quaternary ammonium muscle relaxants — are quaternary ammonium salts used as drugs for muscle relaxation, most commonly in anasthesia. It is necessary to prevent spontaneous movement of muscle during surgical operations. Muscle relaxants inhibit neuron transmission to muscle by… … Wikipedia
quaternary — /kwot euhr ner ee, kweuh terr neuh ree/, adj., n., pl. quaternaries. adj. 1. consisting of four. 2. arranged in fours. 3. (cap.) Geol. noting or pertaining to the present period of earth history, forming the latter part of the Cenozoic Era,… … Universalium
Quaternary — The Quaternary Period is the geologic time period after the Neogene Period roughly 2.588 million years ago to the present. The Quaternary includes two geologic epochs: the Pleistocene including Gelasian, that used to belong to the Pliocene and… … Wikipedia
Quaternary glaciation — The Ice Age redirects here. For other uses, see Ice age (disambiguation). Last ice age redirects here. This term is also used for the last glacial period of the Quaternary glaciation. Northern Hemisphere glaciation during the Last Glacial Maximum … Wikipedia
Salt (chemistry) — This article is about the term as used in chemistry. For the chemistry of table salt, see Sodium chloride. The blue salt copper(II) sulfate in the form of the mineral chalcanthite In chemistry, salts are ionic compounds that result from the… … Wikipedia
quaternary ammonium compound — noun a compound derived from ammonium with hydrogen atoms replaced by organic groups; used as surface active agents, disinfectants, and in drugs • Hypernyms: ↑organic compound * * * noun also quaternary ( es) : any of a large class of strong… … Useful english dictionary
quaternary ammonium compound — Chem. any of a class of salts derived from ammonium in which the nitrogen atom is attached to four organic groups, as in benzalkonium chloride; the salts are cationic surface active compounds used as antiseptics and disinfectants. Also called… … Universalium
Primary salt — Primary Pri ma*ry, a. [L. primarius, fr. primus first: cf. F. primaire. See {Prime}, a., and cf. {Premier}, {Primero}.] 1. First in order of time or development or in intention; primitive; fundamental; original. [1913 Webster] The church of… … The Collaborative International Dictionary of English
amine — aminic /euh mee nik, euh min ik/, adj. aminity /euh min i tee/, n. /euh meen , am in/, n. Chem. any of a class of compounds derived from ammonia by replacement of one or more hydrogen atoms with organic groups. [1860 65; AM(MONIUM) + INE2] * * *… … Universalium
cetylpyridinium chloride — The monohydrate of the quaternary salt of pyridine and cetyl chloride; a cationic detergent with antiseptic action against nonsporulating bacteria. * * * ce·tyl·py·ri·din·i·um chloride .sēt əl .pī rə .din ē əm … Medical dictionary
