quaternary


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quaternary

 [kwah´ter-nar″e, kwah-ter´nar-e]
1. fourth in a series.
2. made up of four elements or groups.

qua·ter·nar·y (Q),

(kwah'tĕr-nār'ē, kwah-tĕr'nĕ-rē),
1. Denoting a chemical compound containing four elements; for example, NaHSO4. Compare: quaternary structure.
2. Fourth in a series.
3. Relating to organic compounds in which some central atom is attached to four functional groups; applied to the usually trivalent nitrogen in its "onium" state, R4N+, "quaternary nitrogen."
4. Referring to a level of structure of macromolecules in which more than one biopolymer is present. Compare: quaternary structure.
[L. quaternarius, fr. quaterni, four each, fr. quattuor, four, + -arius, adj. suffix]

qua·ter·nar·y

(kwah'tĕr-nar-ē)
1. Denoting a chemical compound containing four elements.
2. Fourth in a series.
3. Relating to organic compounds in which some central atom is attached to four functional groups.
4. Referring to a level of structure of macromolecules in which more than one biopolymer is present.

qua·ter·nar·y

(Q) (kwah'tĕr-nar-ē)
1. Denoting a chemical compound containing four elements.
2. Fourth in a series.
3. Relating to organic compounds in which some central atom is attached to four functional groups.
References in periodicals archive ?
According to the Lithuanian Quaternary stratigraphic chart (Satkunas 2009), which is based on the genesis of soils, the investigated soil is classified as a glacial deposit of the Middle Pleistocene Medininkai glacial period (gt II md).
Therefore, in this quaternary structure, the introduction of an additional cation (Mn) produces an effect of "dilution" of this cation in the chalcopyrite structure leaving the cell volume almost unchanged [12].
The Quaternary aquifer is of the Quaternary age and is composed of sands and gravels with a general thickness of 20-55 m, and it generates water inflows of 15-50 [m.sup.3]/h.
Quaternary level of care comprised 441 or 16% of the total number of patients, with an average stay of 9.77 days.
Radiant is in the business of developing/redeveloping hospitals to provide high end quaternary care.
These forms included pyridine, amino, pyrrolic and quaternary nitrogen functionalities, which corresponded to fit peaks at 398.6, 399.4, 400.2 and 401.4 ([+ or -]0.1) eV, designated as N-6, N-A, N-5 and N-Q, respectively.
One goal of our magnetic analysis was to locate any Quaternary basaltic flows which are groundwater bearing as is the case at Oujda (Morocco) and close to Maghnia city.
Therefore, we conducted a series of experiments with two quaternary ammonium salts (TEBAC and tetrade-cyltrimethylammonium bromide) and a series of nitrogenous aromatic heterocycles (Figure 1), obtaining the N-alkylation of these compounds as the main product (Table 1).
Comparitive efficacy of 3rd generation quaternary ammonium compounds and formaldehyde for fumigation of operation theatres.
A fifth level, viz quaternary prevention refers to prevention, has been defined recently.2,3
According the geological documentation (internal report of the VSB - Technical University of Ostrava, 1981) there are Quaternary sediments consisting of loams, sands and gravel in the thickness 16.5 m above the Carboniferous layers consisting of siltstone and claystone.
The composition is essentially free of anionic, nonionic or amphoteric surfactants, glycol solvents and anti-staining additives and free of excipients having a negative effect on bioavailability of the quaternary ammonium agents.