(a.) Consisting of four; by fours, or in sets of four.
(a.) Later than, or subsequent to, the Tertiary; Post-tertiary; as, the Quaternary age, or Age of man.
(n.) The number four.
(n.) The Quaternary age, era, or formation. See the Chart of Geology.
Example Sentences:
(1) The quaternary structure of ribonucleotide reductase of Escherichia coli was investigated, with the use of purified B1 and B2 proteins and bifunctional cross-linking agents.
(2) The sensitivity of an indirect fluorescent antibody (IFA) test (screening test) for the detection of antibodies to cytomegalovirus (CMV) was examined by using 128 serum specimens and quaternary aminoethyl (QAE)-Sephadex A50 column chromatography to separate IgM from IgG class antibodies.
(3) Modifications in quaternary structure induced by variation of these physicochemical parameters were followed by means of X-ray and quasi-elastic light-scattering and quantified in terms of weight average molecular weight (M), radius of gyration (Rg) and hydrodynamic radius (Rh).
(4) These features of the new quaternary structure, denoted Y, may therefore be representative of quaternary states that occur transiently along pathways between the normal unliganded, T, and liganded, R, hemoglobin structures.
(5) On the other hand, the lack of any twitch-potentiating effect by naloxone methylbromide, a quaternary derivative of naloxone, suggests that opioids which potentiate the twitch must enter the lipid phase of the membrane to act.
(6) Two additional quaternary ammonium compounds, tetraethylammonium and N1-methylnicotinamide, were not significantly bound to either tissue.
(7) These effects are due to residual silanols on the surface of the column material and may be remedied by adding suitable amines or quaternary ammonium ions to the eluent as anti-tailing agents.
(8) A quantitative thin layer chromatographic (TLC) method has been developed for determination of the antiarrhythmic quaternary ammonium compound N,N-bis (phenylcarbamoyl methyl) dimethylammonium chloride (QX-572) in biological materials.
(9) While currently available antiarrhythmic agents fail to achieve the desired effect, the recent evidence dealing with the quaternary ammonium derivatives of propranolol, lidocaine, and bretylium provides some hope for the future development of drugs with antiarrhythmic as well as antifibrillatory properties which may provide a therapeutic approach to the prevention of SCD.
(10) In case of non hydrolyzing salts, the quaternary ammonium bromide salts it could not surely be proved by the applied methods whether primary ion exchange had been followed by secondary ion exchange or only primary ion exchange had occurred.
(11) Naloxone methobromide (naloxone MB), a quaternary compound, was also effective in antagonising this effect of nalbuphine but was less effective than naloxone hydrochloride.
(12) Temperature, protein tertiary and quaternary structure, chain heterogeneity, and ligand rebinding subsequent to CO photolysis all affect the line width and position of this transition.
(13) Iodine-containing solutions and quaternary ammonium compounds rarely sensitize.
(14) Administration of the quaternary derivative, neostigmine, indicated that the effects of scopolamine at 22 days were probably central in origin.
(15) The relationships between thermodynamic quantities in a quaternary system of electrolytes are discussed in Appendix 2.
(16) Liquid crystals possess high density packing of DNA molecules complexed with quaternary ammonium salt of oligomer-25 conidin.
(17) Its quaternary dimethyl derivative, designated as pranolium was firstly prepared by Lucchesi.
(18) On the basis of these structural studies, we discuss the relationships between the conformational differences in the allosteric site and the small changes in the quaternary structure within the T form to the possible mechanisms for CTP inhibition and ATP activation.
(19) N,N-dimethylanatoxin (DMAnTX), the quaternary derivative of the potent nicotinic agonist (+)-anatoxin-a (AnTX), has been evaluated for potency and efficacy at nicotinic acetylcholine receptors of frog motor endplates and Torpedo electric organs.
(20) Reaction of the thiol reagent 5,5'-dithio-bis(2-nitrobenzoic acid) (Nbs2) with the brain-specific protein S-100 favours stabilization of the quaternary structure of the protein via disulfide bond formation.