(v. t.) To pull with a sudden jerk; to pluck with a short, quick motion; to snatch; as, to twitch one by the sleeve; to twitch a thing out of another's hand; to twitch off clusters of grapes.
(n.) The act of twitching; a pull with a jerk; a short, sudden, quick pull; as, a twitch by the sleeve.
(n.) A short, spastic contraction of the fibers or muscles; a simple muscular contraction; as, convulsive twitches; a twitch in the side.
(n.) A stick with a hole in one end through which passes a loop, which can be drawn tightly over the upper lip or an ear of a horse. By twisting the stick the compression is made sufficiently painful to keep the animal quiet during a slight surgical operation.
Example Sentences:
(1) Comparison of the S100 alpha-binding protein profiles in fast- and slow-twitch fibers of various species revealed few, if any, species- or fiber type-specific S100 binding proteins.
(2) Twitch-tetanus ratios were calculated and found not to be related to unit contraction time.6.
(3) Hyperosmolar buffer slightly increased the sensitivity and maximal response to methacholine as well as the cholinergic twitch to electric field stimulation.
(4) The present results suggest that TMB-8 blocks twitches by preventing the release of Ca++ ions bound to the intracellular surface of the t-tubular membrane which is often called the store of 'trigger-calcium' ions.
(5) The twitches elicited by 0.1 msec pulses were abolished by tetrodotoxin, but were not reduced by dimethyltubocurarine or by hexamethonium.
(6) Starting from the observation that the part above 6 Hz of the power spectrum of force tremor during isometric contractions can be related to the unfused twitches of motor units firing asynchronously, an attempt was made to study the usefulness of force tremor spectral analysis as a global descriptor of motoneurone pool activity.
(7) The soleus, deep portions of the vastus lateralis, and superficial portions of the vastus lateralis muscles were examined to represent slow-twitch-oxidative, fast-twitch-oxidative-glycolytic, and fast-twitch-glycolytic skeletal muscle fiber types, respectively.
(8) Epinephrine potentiates muscle twitches via the second messenger, cAMP, secondary to hormone binding to membrane-bound beta-receptors.
(9) In physiological studies CDS mimics clonidine's action as an inhibitor of the electrically induced twitch response and as a partial agonist of the epinephrine-induced platelet aggregation.
(10) Facial twitch was followed by the generalized convulsion, further progressing to trembling of the limbs and then kicking of the hindlimb (full seizure) after 55 days of age.
(11) Stimulating the dorsal root at L5 was found to produce hindleg twitches in EAE rats with complete hindlimb paralysis.
(12) The anesthesiologist assessed the degree of neuromuscular blockade intraoperatively prior to pharmacologic reversal either by the standard method of visually counting the number of evoked thumb twitches elicited by supramaximal train-of-four stimulation of the ulnar nerve (i.e., thumb train-of-four count), or by an alternative method such as 1) visually counting the number of evoked orbicularis oculi muscle twitches elicited by supramaximal train-of-four stimulation of the facial nerve, or 2) observing the patient for clinical evidence of partial recovery (e.g., swallowing or attempts to breathe).
(13) Measurements of mouth opening were made for up to 10 min after loss of the adductor pollicis twitch and cessation of muscle fasciculations.
(14) 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.
(15) The relaxant effect of catecholamines on the twitch is temperature and rate dependent.
(16) Disopyramide 5 X 10(-5) - 10(-3) mol litre-1 produced a concentration-dependent reduction of twitch amplitude in the indirectly stimulated chick biventer cervicis preparation, but greater concentrations were required to reduce twitches elicited directly in the presence of erabutoxin-b 1 microgram ml-1.
(17) The pigeon's metapatagialis muscle consists of three slips, two twitch and one tonic, and these slips are distinguishable at the gross anatomical level.
(18) There was a good correlation between the two methods of measurement for both twitch height and train-of-four ratio (correlation coefficients 0.93 and 0.97, respectively).
(19) Head twitches induced by 1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane (DOI) could be abolished by low doses of RP 62203 in mice (ED50 = 0.44 mg kg-1, p.o.)
(20) Chronic stimulation of the denervated SOL resulted in twitch times-to-peak and half-relaxation times that varied in a graded manner between values longer than those in the normal SOL to values as fast as those in the normal EDL, depending upon the pattern used.
Twitcher
Definition:
(n.) One who, or that which, twitches.
Example Sentences:
(1) In the twitcher mice with BMT examined at ages 44 and 71 days (transplanted at the day 9 to 12), degeneration of oligodendrocytes and myelin was still present.
(2) Also, the established twitcher cells were crossed with neomycin-resistant control human fibroblasts and selected in G418 medium.
(3) The assay conditions for both these activities in several mouse tissues have been optimized to facilitate the enzymatic characterization of homozygous and heterozygous twitcher mice.
(4) Although extensive demyelination was noted in the CNS of both mice and additionally, macrophage infiltration was pronounced in the twitcher, BBB remained intact to horseradish peroxidase.
(5) Boiled supernatant fractions, which contained saposins, were prepared from homogenates of twitcher brain, liver, kidney, and spleen.
(6) Twitcher mice which were previously given colloidal carbon intravenously, had some Mac-1 positive cells which contained carbon particles both in the CNS and PNS.
(7) Although psychosine levels in sciatic nerves of HCT-treated twitcher mice increased more slowly than in the nerves of untreated twitchers, the levels in 100-day-old HCT-treated twitcher mice had reached the same high values as those seen in untreated 40-day-old twitchers.
(8) The effect on the activity of galactosylceramide beta-galactosidase as well as 4-methylumbelliferyl-beta-glucoside beta-glucosidase in the twitcher brain and liver homogenates by authentic saposin A and C was similar to that in control tissues.
(9) To determine whether Krabbe patients' cells complement twitcher cells to produce, in hybrid combination, greater than deficient levels of galactocerebrosidase activity, five separate crosses were made between an established twitcher mouse cell line and five cell strains from unrelated Krabbe disease patients.
(10) After postnatal day 10, the number of Schwann cell-axon units gradually increased and the number of unmyelinated axons per unit progressively decreased in the twitcher mouse.
(11) However, marked accumulation of psychosine was found in the 30-day-old-twitcher DRG.
(12) These data correlate well with the pathological changes; tissues containing higher concentrations of galactosylsphingosine show earlier and more severe pathological changes than those containing lower concentrations, thereby indicating the close link of galactosylsphingosine to the pathogenesis of the twitcher mouse.
(13) In attempts to elucidate the origin of accumulated galactosylsphingosine in the twitcher mouse, a murine model of human globoid cell leukodystrophy (Krabbe's disease), UDP-galactose:sphingosine galactosyltransferase activity was assayed in tissues from normal and twitcher mice.
(14) The addition of a foetal brain cell graft to haemopoietic cell transplantation resulted in significantly prolonged survival of twitcher mice.
(15) Examination of the KR1787 strain has shown that it also exhibits mutator activity as assayed by the spontaneous mutation frequency at the unc-22 (twitcher) locus.
(16) These findings suggest that galactosylsphingosine is cytotoxic for myelin-forming cells and is closely related to pathogenetic events in the twitcher mouse.
(17) Thus, these alterations of unmyelinated Schwann cells in the twitcher mouse suggest that attenuated branching of cellular processes develops at an early stage and progresses together with progression of demyelination in this mutant.
(18) There was no apparent difference of lipid composition between control and twitcher DRG, and the galactocerebroside levels from control were similar to those of twitcher.
(19) There's a brief flurry of excitement as some passing twitchers point out four hobbies overhead.
(20) Several of the hybrid lines from both crosses had higher than deficient levels of galactocerebrosidase activity initially, followed by a decrease to twitcher levels during subculture, whereas other lines retained high levels of activity.