(n.) A sliding piece which either is moved by, or moves against, fluid pressure. It usually consists of a short cylinder fitting within a cylindrical vessel along which it moves, back and forth. It is used in steam engines to receive motion from the steam, and in pumps to transmit motion to a fluid; also for other purposes.
Example Sentences:
(1) The buccal glands of adults of the Southern Hemisphere lamprey Geotria australis consist of a pair of small, bean-shaped, hollow sacs, embedded within the basilaris muscle in the region below the eyes and to either side of the piston cartilage.
(2) Both groups were ventilated with a constant-volume piston ventilator.
(3) To give variations in the peak flow-rate (from pulsatile to intermediate to non-pulsatile), three types of blood pump (piston-bellows, screw, and centrifugal) were applied to dogs.
(4) The players were each to be given a present: Dietmar Hamann (he's German, tee hee hee) got a copy of Mein Kampf, while the Italian Alessandro Pistone, perceived as lacking fight, was given a sheep's heart.
(5) After 4 minutes of ventricular fibrillation CPR was performed with the use of a pneumatic piston compressor.
(6) Sinusoidal volume changes were delivered through a tracheostomy by a piston pump driven by a linear motor.
(7) In groups I-III it is possible to discover whether the piston is too long or too short, whether it is dislocated or has slipped.
(8) Pressures and flows from this pump were compared to a Harvard Apparatus pulsatile piston pump.
(9) The vein graft technique (nine cases) is very much inferior to the piston technique.
(10) Results of partial stapedectomy with the formation of small fenestra and the use of teflon piston prostheses in the period of 1980-1984 are shown.
(11) They suck, by means of a stylet acting as a piston, all components of the muscle cell which develops into a nurse cell, into their oral cavity.
(12) A pneumatically driven piston was used to cause a mechanical stress (10-150 N) on the stabilized tooth crown for 30 s, with instantaneous onset and release.
(13) They recorded an auditory gain in more than half the patients (early: PORP 97%, TORP 73%, piston 52%; plasty transplants of ossicles obtained from subjects who died accidentallyĕ For preserfic Council of the Ministry of Health, Czech Socialist Republic, recommended, based on the clinical tests, the manufacture of silastic prostheses of the middle ear.
(14) It is designed as a positive displacement pump, with blood allowed to collect in a valved cavity from which it is ejected by the reciprocating action of a piston.
(15) The ejection force is wholly produced by the compressed coil spring and is transmitted to the piston in the blood chamber by a rod.
(16) The 4 modes of failure characterizing stem-type component progressive loosening mechanisms consisted of stem pistoning within the acrylic (3.3%), cement-embedded stem pistoning with the femur (5.1%), medial midstem pivot (2.5%), calcar pivot (0.7%) and bending (fatigue) cantilever (3.3%).
(17) In model 1, diaphragmatic descent was treated as if it were a "piston in a cylinder."
(18) Insertion, which takes only a few minutes, is accomplished with a plastic tube and piston device.
(19) The expanding ameroid pushes a piston with a concave extension (makrolon) a maximum of 2 mm against the artery, which is fixed to the metal housing by a teflon band (width: 4 mm, thickness: 0.5 mm).
(20) The novel design of this pump incorporates two rack-mounted pistons, driven into opposing cylinders by a micro-stepping motor.
Upstroke
Definition:
(n.) An upward stroke, especially the stroke, or line, made by a writing instrument when moving upward, or from the body of the writer, or a line corresponding to the part of a letter thus made.
Example Sentences:
(1) Occasionally the average forces within an upstroke are greater than within a downstroke of the same sequence.
(2) The i(Na) is primarily responsible for the rapid upstroke of the action potential, while the other current components determine the configuration of the plateau of the action potential and the re-polarization phase.
(3) These two drugs did not affect the duration of AP (APD90), whereas maximum upstroke velocity (Vmax) decreased.
(4) The broadening reflected slowing of the repolarization, whereas the upstroke of the spike was unchanged.
(5) At shorter intervals the upstroke phase of the slow wave was greatly reduced or abolished.
(6) Phenytoin, at 50 to 200 micrograms reduced the maximum upstroke velocity of action potentials (Vmax) with increases in frequency from 0.25 to 5 Hz and in the external potassium concentration [( K+]0) from 2.7 to 8.1 mM.
(7) At 150 ATA membrane excitability was depressed and the maximum upstroke velocity (Vmax) of the action potential was reduced by 10%.
(8) All the drugs in these concentrations produced a concentration-dependent reduction of the maximum upstroke velocity (Vmax).
(9) In epicardium, the reduction of phase 0 and 1 amplitudes led to a slowing of the second action potential upstroke and an increase in the amplitude of phase 2.
(10) In addition, the delay time (required for pulse wave transmission to the neck) of the upstroke (DUEC) and incisura (DIEC) of the external carotid pulse tracing was studied.
(11) Outward K current through delayed-rectifier channels follows the upstroke without appreciable delay and lasts throughout the action potential.
(12) These compounds reduce the amplitude and duration of the plateau phase, but the upstroke phase of slow waves persists.
(13) In addition, the action potential height, maximal upstroke velocity, duration, and time constant of the foot did not change.
(14) In terms of cardiac electrophysiology, amiloride prolongs action potential duration without alteration in upstroke velocity of phase 0 in Purkinje fibers.
(15) The correlations between the catheterization measurement of aortic valve area and the various noninvasive measurements were as follows: time to one-half carotid upstroke (r = -0.32, p less than 0.001); corrected left ventricular ejection time (r = -0.24, p less than 0.05); aortic valve excursion (r = 0.51, p less than 0.001); mean gradient by Doppler study (r = -0.44, p less than 0.001); mean gradient by catheterization analysis (r = -0.55, p less than 0.001); peak to mean gradient ratio measured by continuous wave Doppler (r = 0.38, p less than 0.001); and aortic valve area assessed using the Doppler continuity equation (r = 0.85, p less than 0.001).
(16) The characteristics of the MAP upstroke were compared with those of the local action potential foot as well as with the characteristics of approaching electrical activation during uniform and asynchronous conduction.
(17) Maximum upstroke velocity of Ca-action potentials recorded in partially depolarized ventricles were enhanced by phenylephrine, and the enhancement was eliminated by sotalol but not by phentolamine.
(18) This frequency-dependent maximum upstroke velocity block increased at higher stimulation frequencies and at higher drug concentrations.
(19) litre-1 [K]o, however, caffeine could increase the upstroke of slow response and the force.
(20) The start of opening of these valves occurs at the onset of the pressure rise in the corresponding great vessel and completion of valve opening always occurs on the pressure upstroke.