(n.) A rare metallic element, of the same group as platinum, which it much resembles, being silver-white, but harder, and brittle, and indifferent to most corrosive agents. With the exception of osmium, it is the heaviest substance known, its specific gravity being 22.4. Symbol Ir. Atomic weight 192.5.
Example Sentences:
(1) In addition the following are recommended: intra-arterial embolization of the A. maxilleris interna by carotis external angiography and intranasal contact irradiation with cobalt, radium, or iridium.
(2) It was shown that this oscillating iridium source can give satisfactory dose distribution even if the applicators are inserted with interval greater than 1.5 cm.
(3) The dosimetry of ophthalmic plaques designed to hold iridium-192 or iodine-125 seeds is investigated experimentally and by means of a computer model.
(4) There was a similar incidence of post-operative sensory loss in the two groups, reported by 82% of the mastectomy group and 77% of the iridium group, and an equivalent rate of improvement (76 and 80% respectively).
(5) After radio-sensitizing the post-iridium-192 contact irradiation apparatus on 133 patients with gliomas.
(6) Brachytherapy to the primary site to a dose of 30 Gy using iridium 192.
(7) In the iridium implant series, 86 catheters have been implanted for an average of 3.6 targets per patient.
(8) A total of 127 patients with histologically proved diagnosis of carcinoma of the tonsillar region and soft palate were treated over the past ten years utilizing interstitial iridium-192 implants.
(9) Since 1987, iridium guiding needles were introduced peroperatively in 79 of these patients.
(10) A common radiotherapeutic technique for treating breast cancer is the combination of external beam radiation with an interstitial iridium-192 boost.
(11) The results of a series of 369 patients followed more than 3 years indicate that implantation of Iridium-192 is effective not as sole treatment but as a booster dose 2 months after a course of external beam or intracavitary irradiation.
(12) In the 221 patients treated (225 breasts), 197 breasts received iridium implants and 26 patients received peri-operative chemotherapy (POPFAC).
(13) The results of several previously published series and our own recent series have led us to conclude that interstitial implants of iridium-192 wires are the most appropriate way to achieve the local control of penile carcinoma while conserving penile morphology and function when this technique is used to treat noninfiltrating or infiltrating tumors of less than 4 cm diameter with minor or no invasion of the corpora cavernosa.
(14) These electrodes are divided into major categories according to their particularities: platinum iridium, elgiloy, carbon-tip, anodized platinum and granulated iridium-platinum.
(15) Sixty patients with infiltrating bladder cancer were treated by partial cystectomy and iridium radiotherapy between 1977 and 1982.
(16) A screw that was specifically designed, allowed us to fix a precious metal tube to the skull cap for about eight days making possible the application of a marginal tumor dose of 30 Gy at a daily fractionation of 2 X 2 Gy using the iridium-afterloading-technique.
(17) This technique of endoscopic biliary decompression before internal iridium administration minimizes complications by allowing biliary drainage during treatment.
(18) Iridium-192 wires are most frequently employed as a sealed intracavitary source.
(19) Radioactive iridium wire (192Ir) was inserted into the surgical track to deliver prophylactic irradiation (4500 cGy) to prevent tumour seeding.
(20) A new technique is reported for the treatment of hepatic metastases using sonography-directed percutaneous placement of a 14-gauge needle applicator and a high-intensity "remote afterloading" iridium-192 (Ir-192) source for interstitial radiation therapy.
Iridize
Definition:
(v. t.) To point or tip with iridium, as a gold pen.
(v. t.) To make iridescent; as, to iridize glass.
Example Sentences:
(1) Changes in pupil size indicated a substantial cholinergic effect on the iridal sphincter musculature.
(2) Pigmentations are significantly related to the colour of the iris (visible in 8% of blue irides, against in 40% of brown).
(3) In subjects with light or hazel irides, phenylephrine caused maximal dilatation in 60 to 75 min, mean values being 5.6 mm with 1 drop of 2%, 6.0 mm with 2 drops of 2.5%, and 7.1 mm with 1 drop of 10%.
(4) The effect of desipramine, clonidine, phentolamine, phenoxybenzamine and GD131 on uptake of [(3)H]-NA in isolated irides was determined.3.
(5) The effect in the eye was small at 2 minutes, but at 10 minutes local blood flows in the choroid and the ciliary body were decreased by 50% and the iridal blood flow by 30%.
(6) Furthermore, an uneven distribution of fluorescent nerve fibers was observed within individual irides.
(7) 5HT-positive fibers also penetrated into the irides forming dense networks in the walls of blood vessels and elsewhere in the irides.
(8) In the patients with other types of iridal disorder the endothelial cells were normal in form.
(9) Patients with darker, thicker irides are more prone to have subacute angle-closure glaucoma, which requires gonioscopy and the recognition of subtle details that may be difficult to interpret.
(10) Dogs affected with chronic superficial keratitis (CSK) and clinically normal dogs were tested for cellular hypersensitivity, using the leukocyte migration-inhibition (LMI) technique to 3 ocular antigens (Staphylococcus aureus and corneal and iridal proteins).
(11) The ocular examination reveals a small anterior chamber, sectorial iridic atrophies, a mydriatic pupil, the camerular angle closed.
(12) Surprisingly, a large variation in the amount of vasoactive intestinal polypeptide-positive nerves was seen among irides.
(13) These lesions were most often found in blue irides at the 12 o'clock region.
(14) Isolated rat irides were incubated with [(3)H]-noradrenaline [(3)H-NA] (10(-7)M), superfused with buffer and then stimulated by an electrical field.
(15) At fluorescein angiography (FAG) at a mean of 8 months post-operatively, 9 showed leaking from the iridal vessels, and 3 were normal: Three cases were excluded because of factors affecting the iris FAG.
(16) Eleven pigmented rabbit irides were irradiated with the argon laser and were examined electron-microscopically at several intervals between 15 minutes and 256 days after exposure.
(17) A Thy-1-positive fibre plexus reappeared in intraocular iris transplants after 4 weeks, strongly indicating that Thy-1-immunoreactive fibres in adult mouse irides are associated with the nerve fibres and not with their supportive tissue.
(18) These results indicate that S-Ag and its mRNA accumulate in the irides of some uveitic patients.
(19) Irides of neonates showed scattered, smooth fibres in a sparse plexus, without visible axon bundles.
(20) Obliteration of the ciliary cleft by diffuse iridal melanoma (38 eyes), or other neoplasms (14 eyes), or by the presence of idiopathic lymphocytic-plasmacytic anterior uveitis (53 eyes) were the most frequent lesions likely to explain the development of glaucoma.