(n.) An opening; an open space; a gap, cleft, or chasm; a passage perforated; a hole; as, an aperture in a wall.
(n.) The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture.
Example Sentences:
(1) Both apertures were repaired with great caution using individual sutures without resection of the hernial sac.
(2) By moving an electronic pen over a digitizing tablet, the subject could explore a line drawing stored in memory; on the display screen a portion of the drawing appeared to move behind a stationary aperture, in concert with the movement of the pen.
(3) The procedure consists of a Kirschner wire used as the means of traction on the remaining soft tissue of the lower lip, using the upper teeth or pyriform aperture bone as remote fixed points for tissue traction.
(4) The calibrated aperture in the bottom of each well is small enough to retain fluid contents by surface tension during monolayer growth, but also permits fluid to enter the wells when transfer plates are lowered into receptacles containing washing buffer or test sera.
(5) Acute toxicity consisted primarily of pain within the AA aperture (74%), pain outside the aperture (33%), and bladder spasm (26%) or systemic stress (25%).
(6) Latex particles, including BCR Certified Reference Material CRM 166a, have important applications for checking linearity and for calibrating aperture-impedance instruments used to determine red-cell volumes.
(7) The distance between the apertures on the screen as well as the subject's distance from the screen served as experimental parameters.
(8) When the highly crystalline core contents are suitably oriented to transmit their Bragg reflections through the objective aperture, regular fringes separated by 2-9.5 A have been visualized.
(9) Aperture size was modulated during flight on some trials in an attempt to test between these possibilities, but the results were inconclusive.
(10) When examined with the 3 mm aperture, the average resolving power of the IOLs was 81% of the diffraction limit; when examined with the 4 mm aperture, the average resolving power was 67% of the diffraction limit.
(11) Its principle consists in repairing the tissue defect resulting from the excision of the lower lip by the additional surgical removal of one or two soft tissue triangles from the region of the nasolabial fold and in achieving primarily, by means of horizontal relieving incisions at the base of the lip defect, an extension of the mouth aperture.
(12) Temporal fluctuations of stomatal aperture are important to water use efficiency.
(13) Specific microscope components and objectives are used, and the numerical apertures are adjusted such that light diffraction colors are produced to allow differentiation of the various biological entities and their habitat materials.
(14) Topographical corneal thickness changes were monitored in 10 subjects who each wore a hydrogel contact lens with a large central aperture ("donut" lens) for 6 hours.
(15) The theory is based on a three-dimensional model and the electromagnetic field is assumed to be generated by a prescribed electric field along a ring-shaped aperture.
(16) Quantitative analysis of an area 27 microns in diameter, or a total analysed volume of 1.1 microns3, was performed by using a mechanical aperture in the ion optical system.
(17) We evaluated both low- and high-power lenses and varied the input aperture size between 1, 3, and 5 mm.
(18) Subjects were asked to match the speeds of two moving random-dot patterns seen through circular apertures.
(19) However, our experience has shown us that in certain cases, there are some possibilities of aperture if we feel ourself free enough with our medical identity and if we keep silent as long as the patient is not able to hear us.
(20) The estimated doses to the third, fourth, fifth, and sixth cranial nerves was calculated at a saggital plane 13 to 15 mm from the pituitary by using computer-drawn dosimetry charts for the respective aperture size.
Iris
Definition:
(n.) The goddess of the rainbow, and swift-footed messenger of the gods.
(n.) The rainbow.
(n.) An appearance resembling the rainbow; a prismatic play of colors.
(n.) The contractile membrane perforated by the pupil, and forming the colored portion of the eye. See Eye.
(n.) A genus of plants having showy flowers and bulbous or tuberous roots, of which the flower-de-luce (fleur-de-lis), orris, and other species of flag are examples. See Illust. of Flower-de-luce.
(n.) See Fleur-de-lis, 2.
Example Sentences:
(1) The advantages of the incision through the pars plana ciliaris are (1) easier approach to the vitreous cavity, (2) preservation of the crystalline lens and an intact iris, and (3) circumvention of the corneal and chamber angle complications sometimes associated with the transcorneal approach.
(2) The so-called apparent accommodation has been measured in patients implanted with anterior chamber, iris support and posterior chamber IOLs.
(3) These patients did not have narrow anterior chamber angles preoperatively, and several were aphakix with surgical iris colobomas.
(4) A 1.5-year-old girl presented with a peripheral iris mass.
(5) In normal as well as in cirrhotic subjects somatostatin infusion provoked a marked reduction of the IRI plasma level and this was uninfluenced by subsequent glucagon administration.
(6) While tonic pupil and reduced sweating can be attributed to the affection of postganglionic cholinergic parasympathetic and sympathetic fibres projecting to the iris and sweat glands, respectively, the pathogenesis of diminished or lost tendon jerks remains obscure.
(7) Adrenergic desensitization of the eye resulted in attenuation of: The polyphosphoinositide response in the iris, measured both as loss of 32P-radioactivity from phosphatidylinositol 4,5-bisphosphate (PIP2) and as IP3 accumulation; the epinephrine-stimulated liberation of AA, from membrane phosphoinositides and other phospholipids, and PGE2 release in the iris; and the epinephrine-induced muscle contraction in the iris dilator.
(8) ChAT activities of the iris, adrenal gland, and superior cervical ganglion were similar in all groups.
(9) Plasma glucose, insulin (IRI), glucagon (IRG) and SRIF-LI were measured.
(10) The appearance in aqueous humor of selected metabolites of arachidonic acid metabolism at various times was correlated with the influx of protein and myeloperoxidase activity in the iris-ciliary body.
(11) A decrease in the levels of IRI, C-peptide and biological activity of serum insulin in the 1st group indicated a possibility of type I diabetes mellitus in such patients.
(12) When using a nylon thread for the attachment of a pseudophakos to the iris, it may happen that the suture is slung tightly around the implant-lens.
(13) Iris prolapse did not interfere with the procedure.
(14) While there are many potential causative factors, erroneous concepts of IOL positioning and design appear to have led to PBK with many iris-supported and anterior chamber lens styles.
(15) Examples include the specific pattern of hypodontia seen before the development of iris dysplasia in Rieger syndrome, and the presence of supernumerary teeth and facial osteomas preceding malignant transformation of intestinal polyps in Gardner syndrome.
(16) Soft lenses also provide the options of disposability and of iris color change.
(17) Fluorescence angiography of the iris was performed on 135 patients with diabetes mellitus.
(18) These increases paralleled the in vitro rise in iris [3H]norepinephrine ([3H]NE) uptake, a measure of the presence of functional nerve terminal membrane.
(19) Pigmentations are significantly related to the colour of the iris (visible in 8% of blue irides, against in 40% of brown).
(20) Plasma C-peptide immunoreactivity (CPR) and immunoreactive insulin (IRI) increased during the infusion.