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
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 ?
all used the principles of underlying quaternary structure organization and the fundamental steps by which protein complexes assemble as a starting point.
"By systematically combining different assembly steps in different ways, we were able to enumerate a large set of possible quaternary structure topologies, or patterns of key interfaces between the proteins within a complex," Ahnert wrote in the paper "Principles of assembly reveal a periodic table of protein complexes" published in Science.
The dataset is from the quaternary structure library PiQSi (http://www.PiQSi.org/) built by Levy [7].
Distinctive hydration patterns for each of the quaternary structures were observed, but a number of conserved water molecule binding sites were found that are independent of the conformational state of the protein.
Synthesis of a model protein of defined secondary and quaternary structure: effect of chain length on the stabilization and formation of two-stranded [alpha]-helical coiled-coils.
Hb is an allosteric protein that undergoes conformational change in quaternary structure from the T (tense) state (deoxy-Hb) to the R (relaxed) state (oxy-Hb) upon binding its first oxygen molecule such that the binding of additional oxygen molecules is enhanced.
These include primary, secondary, tertiary, and quaternary structures. The primary structure is the order or sequence of linear chains of amino acids present.