quaternary

(redirected from the Quaternary)
Also found in: Dictionary, Thesaurus, Medical.

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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Lietuvos kvartero storymes geologiniu strukturu turio ivertinimas [Assessing the volumes of geological structure of the Quaternary in Lithuania].
[14] Delgado G.E., Mora A.J., Contreras J.E., Grima-Gallardo P., Duran S., Munoz M., Quintero M.: "Crystal structure characterization of the quaternary compounds CuFeAl[Se.sub.3] and CuFeGa[Se.sub.3]", Crystal Research and Technology, Vol.
Cambrian limestone groundwater samples were collected by stratification sampling at leakage points under the shaft, mixed groundwater samples were collected using the drilling method, and groundwater samples in the Quaternary aquifer were collected from a motor-pumped well for civil use.
This shows that the quaternary nitrogen present in three oil shale samples has a high thermal stability.
Tables 1 and 2 indicate that the quaternary ammonium salts are the main substrate in the reaction that results in N-alkylation and the formation of a tertiary amine.
The quaternary chitosan N-[(-2hydroxy-3-triethyl ammonium) propyl] chitosan chloride (HTCC) was synthesized by reacting chitosan with 3-chloro-2-hydroxy propyl triethyl ammonium chloride, as in the following Schemes:
The P4 network is supported by the Wonca International Classification Committee website under the Quaternary Prevention rubric (http://www.ph3c.
The dataset is from the quaternary structure library PiQSi (http://www.PiQSi.org/) built by Levy [7].
The Quaternary has been characterized by a series of ice ages interrupted by interglacial periods in middle-high latitudes of the Northern Hemisphere.
This temperature is the lifetime temperature of the quaternary blend.
The TEA quatemary ammonium fabric softening material contains at least 10% monoester, by weight of the quaternary material, and has an IodineValue of between 0-60.The single long chain cationic surfactant is a quatemized amido-amine surfactant and preferably has a methylsulphate counterion.
As the annual conference was held for the first time in the Baltic region (Vilnius, Lithuania to be specific), which experienced substantial glaciation during the Quaternary period, leaving distinctive geomorphological features, the conference theme was chosen to be "History of Quaternary Geology and Geomorphology." The focus however goes beyond the Baltic to cover the history of research and scholarly debates about Quaternary geology and geomorphology in different parts of the world, as well as some current research topics.