(v. t.) To extinguish; to overwhelm; to make an end of; -- said of flame and fire, of things burning, and figuratively of sensations and emotions; as, to quench flame; to quench a candle; to quench thirst, love, hate, etc.
(v. t.) To cool suddenly, as heated steel, in tempering.
(v. i.) To become extinguished; to go out; to become calm or cool.
Example Sentences:
(1) The extreme quenching of the dioxetane chemiluminescence by both microsomes and phosphatidylcholine, as a model phospholipid, implies that despite the low quantum yield (approx.
(2) The drug is extracted from serum or urine with ethyl acetate, separated by TLC, and determined by fluorescence quenching densitometry.
(3) Formation of a complex between alpha-tocopherol or its analogues in the excited state and fatty acids or their hydroperoxides has been suggested basing on the fluorescence quenching experimental data.
(4) Quenching of intrinsic fluorescence of (Ca2+-Mg2+)-ATPase by acrylamide, performed in the presence of Ca2+, gave evidence for a single class of tryptophan residues with Stern-Volmer constant (KSV) of 10 M-1.
(5) The 23Na double-quantum signal was quenched in both the extracellular and the intracellular compartments with increasing concentration of Li in each compartment, along with an increase in the 23Na T1 both intra- and extracellularly.
(6) Binding increases the fluorescence intensity of Tyr-49 by 130% while the fluorescence of the hormone tyrosine is almost completely quenched.
(7) Addition of 2,6-dimethylbenzoquinone caused quenching of these absorbance changes.
(8) These observations lead to the hypothesis that acidosis quenches fluorescence in distal skin flaps.
(9) The degree of quenching was accurately predicted by a simple relation derived in this paper, as well as a more complex equation previously developed by Tweet, et al.
(10) Subtilin may slightly enter the hydrophobic core as suggested by tryptophan fluorescence quenching and liposome fusion experiments.
(11) Greater than 99% of the polymerization reaction products were quenched by the addition of 2.0 mM ascorbate.
(12) Acoustic probe-based assays can enhance assay and laboratory efficiency through testing for multiple analytes in a single sample or increasing available binding surface area (by using probe and well surfaces simultaneously), and by eliminating quenching.
(13) The second-order rate constants appear to be at least 3 orders of magnitude lower than the second-order constants for quenching of the fluorescent probes; this is taken as a clear indication that ubiquinone diffusion is not the rate-determining step in the quinone-enzyme interaction.
(14) Accessibility to iodide was much lower, as was the rate of quenching by iodide, adding support to the conclusions from acrylamide quenching.
(15) An ATP-dependent, N-ethylmaleimide-inhibitable, 3,3',4',5-tetrachlorosalicylanilide-reversible, and chloride-attenuated quench of bis(1,3-dibutylbarbituric acid-(5] pentamethinoxonol fluorescence was seen, consistent with net transfer of positive charge into the vesicles.
(16) Quenching data indicated that five out of 22 tryptophans in CBH are surface-localized and are available for quenching with both KI and acrylamide, and three other tryptophans are buried and are available only to acrylamide.
(17) Acid quenching of a stiochiometric reaction between Ac(= S)CoA and citrate synthase following the transient quantitatively regenerates Ac(= S)CoA, indicating carbon-carbon bond formation had not yet occurred.
(18) The pulsed laser photolysis products of the charge-transfer quenching reaction were examined.
(19) The highest yield of amino acids with the quench reaction was 9 x 10-7 molecules per erg of input energy.
(20) Tris-washed chloroplast enriched in the photosystem II reaction center species Z+Q- and ZQ- are nearly four times more sensitive to nitrobenzene quenching than those enriched in Z+Q.
Thirst
Definition:
(n.) A sensation of dryness in the throat associated with a craving for liquids, produced by deprivation of drink, or by some other cause (as fear, excitement, etc.) which arrests the secretion of the pharyngeal mucous membrane; hence, the condition producing this sensation.
(n.) Fig.: A want and eager desire after anything; a craving or longing; -- usually with for, of, or after; as, the thirst for gold.
(n.) To feel thirst; to experience a painful or uneasy sensation of the throat or fauces, as for want of drink.
(n.) To have a vehement desire.
(v. t.) To have a thirst for.
Example Sentences:
(1) The possibility that the pressor effects of angiotensin II influence angiotensin-induced thirst was investigated in dogs pretreated with hexamethonium.
(2) The results suggest that angiotensin and cholinergic receptors in the brain have a physiological role in thirst.
(3) Experiments in which this method has been applied to the measurement of hunger and thirst in doves are outlined, and the results are discussed in terms of their implications for motivation theory in general.
(4) The subjects described the thirst sensations as mainly due to a dry unpleasant tasting mouth, which was promptly relieved by drinking.
(5) To determine whether centrally released vasopressin influences thirst, observations of osmotic thirst threshold, osmotic load excretion and postloading restitution of plasma osmolality were made in dogs in control experiments and during infusion of AVP antagonists into the third ventricle.
(6) The results of these studies, considered as a whole, support the view that McCleary's osmotic postingestional satiety signal acts as an intestinal distention signal rather than by inducing thirst.
(7) These findings suggest the following sequence of events: impaired A-II production caused impairment of thirst perception, renal-concentrating capacity, and AVP secretion and contributed to development of hypernatremic dehydration in these elderly patients.
(8) We postulated that the high salt content of CF patients' sweat and the consequent absence of body-fluid hyperosmolality during a long episode of sweating might deprive such patients of a thirst stimulus.
(9) The fall in plasma osmolality associated with human pregnancy is accounted for entirely by a lowering of the osmotic thresholds for thirst and vasopressin release.
(10) To investigate further the stimulus for this effect, its specificity, and association with thirst, six volunteers were deprived of water for 24 h and given a salt load on two separate occasions.
(11) Beliefs best differentiating among the three groups were: (1) superiority of taste of their "own" sodas, (2) perceived efficiency to quench thirst, and (3) perceived compatibility with other menu items.
(12) In the absence of conflict, there was no difference in the satisfaction of the thirst and the defensive motivation in animals adapted to hypoxia and in controls.
(13) A patient developed extreme thirst and polyuria after massive bleeding and prolonged shock due to placenta previa percreta with bladder invasion.
(14) The sensation of thirst did not correlate with plasma osmolality and was not always related to plasma AVP concentration.
(15) Photograph: Nerissa Sparkman This being Dublin, visitors to Stoneybatter will find no shortage of opportunities to slake their thirst.
(16) We describe a case of diabetes insipidus after head injury in which thirst persisted despite treatment with DDAVP and normal plasma osmolality.
(17) Basal levels of serum osmolality and thirst were significantly higher in alcoholics compared with controls, yet actively drinking alcoholics at the start of the study had normal vasopressin (AVP) levels, plasma angiotensin II (Ang II), plasma renin activity, plasma aldosterone (Aldo), and plasma catecholamines.
(18) Brin and Page remain joint presidents, Brin in charge of technology, Page responsible for product launches, but the rapid growth of recent years has been steered by chief executive Eric Schmidt, 53, who came on board in 2001 as the commercial 'brain', negotiating the founders' evangelism and the shareholders' thirst for profits.
(19) Involvement of the hypothalamus and pituitary can cause primary polydipsia and disordered regulation of thirst; diabetes insipidus, impaired secretion of anterior pituitary hormones (with clinically apparent hypothyroidism, hypogonadism, hypoadrenalism, or impaired growth), and increases in serum prolactin may also result.
(20) Previous reports demonstrated that hypothalamic stimulation may elicit either eating, drinking, or gnawing and emphasized both the specificity of the neural circuits mediating these behaviors and the similarity to behavior during natural-drive states such as hunger and thirst.