quaternary

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quaternary

1. Chem containing or being an atom bound to four other atoms or groups
2. Maths having four variables

Quaternary

1. of, denoting, or formed in the most recent period of geological time, which succeeded the Tertiary period nearly two million years ago
2. the. the Quaternary period or rock system, divided into Pleistocene and Holocene (Recent) epochs or series

Quaternary

[′kwät·ən‚er·ē]
(geology)
The second period of the Cenozoic geologic era, following the Tertiary, and including the last 2-3 million years.
References in periodicals archive ?
Terminal disinfection in hospital using Quaternary ammonium compounds by use of a spray - fog technique.
Naturally occurring quaternary ammonium compounds including choline, glycine betaine and carnitine, found in many microbial environments, which have different biological functions.
So, the quaternary ammonium compounds dimethyl-di(hydrogenated tallow) alkyl ammonium salt shows ease of crosslinking as compared to other primary amine modifier.
Fate and effect of quaternary ammonium compounds on a mixed methanogenic culture.
Didecyldimethyl ammonium tetrafluoroborate (DBF, [[([C.sub.10][H.sub.21]).sub.2]N[(C[H.sub.3]).sub.2]]+B[F.sup.-.sub.4]), a quaternary ammonium compound that contains two antifungal activity groups (quaternary ammonium and boric tetrafluoride [B[F.sup.-.sub.4]]), showed decay resistance against both Fomitopsis palustris and Trametes versicolor, even after a severe leaching test (Kartal et al.
Furthermore, the FRC24 integron contains the antiseptic (quaternary ammonium compounds) resistance gene qacH.
Disinfectants were chosen that contained quaternary ammonium compounds, alcohol, or sodium hypochlorite.
Biocidal ingredients in these products often are quaternary ammonium compounds (such as BZK) and triclosan.
Previous studies have shown that both quaternary ammonium compounds and triclosan can activate effluxpumps in bacteria that transfer plasmids containing resistance genes.
Previous studies have shown that both quaternary ammonium compounds and triclosan can activate efflux pumps in bacteria that transfer plasmids containing resistance genes.
Cationic surfactants may be protonated long-chain amines and long-chain quaternary ammonium compounds. The class of amphoteric surfactants is represented by betaines and certain lecithins, while nonionic surfactants include polyethylene oxide, alcohols, and other polar groups.
Attached to the nanoparticles are molecules called quaternary ammonium compounds. Previous studies had shown that these molecules provide antimicrobial activity by disrupting bacterial membranes on contact.