(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.
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.