(n.) A flat, circular plate; as, a disk of metal or paper.
(n.) The circular figure of a celestial body, as seen projected of the heavens.
(n.) A circular structure either in plants or animals; as, a blood disk; germinal disk, etc.
(n.) The whole surface of a leaf.
(n.) The central part of a radiate compound flower, as in sunflower.
(n.) A part of the receptacle enlarged or expanded under, or around, or even on top of, the pistil.
(n.) The anterior surface or oral area of coelenterate animals, as of sea anemones.
(n.) The lower side of the body of some invertebrates, especially when used for locomotion, when it is often called a creeping disk.
(n.) In owls, the space around the eyes.
Example Sentences:
(1) These findings suggest that clonidine transdermal disks lower blood pressure in hypertensive patients, but produce local skin lesions and general side effects.
(2) These observations suggest that the liver secretes disk-shaped lipid bilayer particles which represent both the nascent form of high density lipoproteins and preferred substrate for lecithin-cholesterol acyltransferase.
(3) Opsin becomes incorporated into the disk membrane by a process of membrane expansion and fusion to form the flattened disks of the outer segment.
(4) Somatic and functional antigens of Dictyocaulus filaria were comparatively studied by means of disk electrophoresis.
(5) We performed a prospective study on 68 eyes of 68 patients to compare the vertical cup-disk ratio obtained with the video-ophthalmograph to that obtained with manual analysis of black-and-white stereoscopic photographs.
(6) Visible light activates a large guanosine cyclic 3',5'-phosphate (cGMP)- and phosphodiesterase (PDE)-dependent infrared light-scattering change in suspensions of photoreceptor disk membranes.
(7) Three disks of different sizes (10, 25, and 45 mm in diameter) were attached to the edge of the baresthesiometer, and pressures of 1, 3 and 5 kg were applied to the 10 mm disk, and 1, 3, 5, and 7 kg to the other disks.
(8) The hemolytic characteristics of 14 different polydimethyl-siloxane materials were studied, using a rotating disk device to shear whole human blood for 6000 sec.
(9) These optic disk anomalies occurred bilaterally with some inter- and intra-individual variable expressivity.
(10) This is the first reported case, to the best of my knowledge, of disk neovascularization occurring after intravenously injected, crushed, unfiltered, methylphenidate HCl tablets.
(11) We have investigated the relationship between rhodopsin photochemical function and the retinal rod outer segment (ROS) disk membrane lipid composition using flash photolysis techniques.
(12) We found that the Na-Ca exchanger is distributed throughout all membranes in contact with the extracellular space, including the sarcolemma, the transverse tubules (T-tubules), and the intercalated disks.
(13) The minimal inhibitory concentration of netilmicin determined by the agar dilution method was correlated with the disk diffusion zone of inhibition against 322 clinical isolates.
(14) The initiation step consisting of the binding of RNA with the 36S disk of protein was easily accomplished.
(15) The state of the intervertebral disks, intervertebral joints and cerebrospinal canal in degenerative vertebral diseases was assessed.
(16) It is concluded that although a rapid automated system for antibiotic sensitivity testing is desirable, the conventional disk agar diffusion method is easier to perform, more reliable, and a less expensive procedure for antibiotic sensitivity determination.
(17) The diagnostic accuracy of CT in cases of lumbar disk prolapse was investigated on the basis of a group of 158 of our own patients who were divided into three separate groups.
(18) Disk position was assessed inaccurately in either plane in patients with severe degenerative joint disease.
(19) Based on the morphology and magnetic anisotropy of the rod outer segment, the major phospholipid peak is attributed to the flat part of the disk membranes while the phospholipids of the plasma membrane are thought to contribute only to the minor peak.
(20) QC range for H. Influenzae ATCC 49247 were established using multiple HTM agar and broth base lots, three disk lots for each drug, and a number of test replicates consistent with the National Committee for Clinical Laboratory Standards M23-T guideline.
Piston
Definition:
(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.