Iridium
Mostrando 25-36 de 42 artigos, teses e dissertações.
-
25. Estudos envolvendo a modificação e a interação do lapachol com compostos de metais de transição
This thesis is concerned with some studies of the natural compound 2-hidroxy-3(3-methyl-2-butenyl)-1,4-naphtoquinone, popularly known as lapachol. In Chapter I, a review is presented which includes the descriptions of procedures for the extraction of lapachol, its synthesis, physical, spectroscopic and structural properties, its biological activities, some o
Publicado em: 2000
-
26. Prevention of vascular restenosis with radiation.
Recently, ionizing radiation has been shown to decrease the proliferative response to injury in animal models of restenosis. The Scripps Coronary Radiation to Inhibit Proliferation Post-Stenting (SCRIPPS) trial was a double-blind, placebo-controlled, randomized trial to test this new treatment modality in restenotic stented human coronary arteries. Patients
-
27. The Antiatherogenic Effect of Iridium192 upon the Cholesterolfed Rabbit*
-
28. Demonstration of the parity-violating energy difference between enantiomers
Racemic mixtures of (+) and (−) sodium potassium tartrate, tris(1,2-ethanediamine)cobalt(III), and tris(1,2-ethanediamine)iridium(III) molecules were crystallized, and the optical activities of the resulting crystalline materials, dissolved in water, were carefully measured to study the influence of the parity-violating energy difference in the crystalliza
The National Academy of Sciences.
-
29. Solar abundance of iridium
By a method of spectrum synthesis, which yields log gfA, where g is the statistical weight of the lower level, f is the oscillator strength, and A is the abundance, an attempt is made to deduce the solar iridium abundance from one relatively unblended, but fairly weak IrI line, λ 3220.78 Å. If the Corliss-Bozman f-value for this line is adopted, we find lo
-
30. Editing the stereochemical elements in an iridium catalyst for enantioselective allylic amination
Individual diastereomeric phosphoramidites and mixtures of diastereomeric phosphoramidites were evaluated in the iridium-catalyzed amination of allylic carbonates. The original process was conducted with a phosphoramidite ligand containing a resolved 2,2-dihydroxy-1,1-binaphthyl (BINOL) group and a diastereomerically and enantiomerically pure bis(phenethyl)a
National Academy of Sciences.
-
31. Alkyl-metal and aryl-metal bond chemistry in coordinately unsaturated polynuclear metal complexes
A new class of coordinately unsaturated polynuclear rhodium and iridium alkyl, benzyl, and aryl derivatives of the form [RM(1,5-cyclooctadiene)]x have been prepared by the reaction of the organolithium reagent with the cyclooctadienemetal chlorides at -78°C. The x-ray crystal structure of [μ-CH3Rh (1,5-cyclooctadiene)]2 is reported. The analogous iridium d
-
32. New technique for treating occlusive and stenosing tumours of the trachea and main bronchi: endobronchial irradiation by high dose iridium-192 combined with laser canalisation.
A new technique is described for treating patients with inoperable malignant tumours causing occlusion or stenosis of the trachea or main bronchi. High dose iridium-192 (20 Ci) was introduced by an afterloading device under computer control via a 4 mm delivery tube into the tumour mass. In 29 of the 56 patients the tumour mass was canalised by a neodymium-YA
-
33. Autosomal dominant congenital Horner's syndrome in a Dutch family.
A Dutch family is reported with congenital Horner's syndrome in five cases spanning five generations, with symptoms of varying degree but mainly ptosis and meiosis. Heterochromia iridium, anhidrosis, and enophthalmos were not present. The site of the lesion may be in the region between Gasser's ganglion and the short vertical segment of the internal carotid
-
34. Bile duct carcinoma. Diagnosis and treatment.
Fifty-three patients were evaluated for carcinoma of the extrahepatic bile ducts at the University of Virginia from 1951 to April 1984. This population was retrospectively reviewed and 33 preoperative and postoperative variables were analyzed to evaluate the predictors of increased survival. No preoperative data, including symptoms, admitting laboratory data
-
35. Evidence from bond lengths and bond angles for enneacovalence of cobalt, rhodium, iridium, iron, ruthenium, and osmium in compounds with elements of medium electronegativity
Enneacovalence of neutral atoms can be achieved for Co, Rh, and Ir by promoting some electrons from the nd orbital to the (n + 1)s and (n + 1)p orbitals and for Fe, Ru, and Os by a similar promotion together with the addition of an electron, which may be provided by an electron pair from a singly bonded carbonyl group or other group. The bond lengths and bon
-
36. Conservative treatment for breast cancer. Complications requiring reconstructive surgery.
Women who select conservative treatment for carcinoma of the breast (tumor excision followed by supervoltage radiation therapy) place a premium on breast preservation and aesthetics. When local control fails and they require a mastectomy, or when the aesthetic appearance is unacceptable, they may request breast reconstruction. The goal of this study is to ev