Iridial

Kalium-hydrat, n. potassium hydroxide, -hy-drid, n. potassium hydride (KH). -hydroxyd, n. potassium hydroxide, -hydriir, n. potassium subhydride (IC2H or K4H2). -iridi-chlorid, n. potassium eh loroiridate. -jodat, n. potassium iodate. 

K. Bergh, P. Wentzel, J. Stjernschantz, Production of prostaglandin E2 by iridial melanocytes exposed to latanoprost acid, a prostaglandin p2a analogue, J. Ocular Pharmacol. Then 18 (2002) 391. 

The double cupric, ferrous, manganous, and nickelous iodides have not been prepared the double ferrous and molybdenous iodides are wanting and the double iridious iodides have alone been prepared. 

The reduction behaviour of the alkylidene adduct of a cobalt-dithiolene complex (423) has been examined548 and the study has shown that, when the alkylidene-bridged structure (423) is reduced by one electron, it isomerizes rapidly and quantitatively to the ylide form (424). This represents the first example of reversible isomerization of the metal-carbon bond in a cobaltadithiolene complex. A surprising cis- to /to/ .v-dihydride isomerization which is unprecedented for 18-electron six-coordinate complexes has been observed549 in an octahedral iridi um-cfr-dihydride complex. 

Pitkanen et al. [51] reported the isolated bovine RPE-choroid was up to 20 times more permeable to lipophilic than hydrophilic beta-blockers. Furthermore, the in vitro permeability of bovine RPE-choroid to hydrophilic compounds and macromolecules was 10 to 100 times less compared to sclera, whereas the permeability for lipophilic molecules was in the same range for both tissues. The isolated bovine RPE-choroid also exhibited differential permeation by molecular weight and Stokes radius. The permeation rate of 4, 10, and 20 kDa FITC dextrans was moderate compared to a good permeation rate for the 376 Da carboxyfluor-escein and a poor penetration rate for 40 and 80 kDa FITC-dextrans. The permeability to carboxyfluorescein was 35 times more than to 80 kDa FITC-dextran [51]. In a study on the permeability of the human ciliary epithelium to a horseradish peroxidase, Tonjum and Pedersen [52] reported that ciliary and iridial epithelium contained a system of paracellular zonulae occludentes. Peroxidase was applied on the stromal side of ciliary body and iris specimens obtained from freshly enucleated eyes. The 40 kDa peroxidase was blocked apically in the lateral intercellular spaces of the CNPE whereas in the iris the progression of peroxidase was blocked apically in the lateral intercellular spaces of the IPE. Freddo [53] studied the intercellular junctions in the posterior IPE cells of the rhesus monkey by electron microscopy, freeze-fracture, and horseradish peroxidase. Intravenously injected horseradish... 

Tonjum, A.M., and O.O. Pedersen. 1977. The permeability of the human ciliary and iridial epithelium to horseradish peroxidase An in vitro study. Acta Ophthalmol (Copenh) 55 781. 

Figure 4. Fruit bodies of Didymium iridis (wild)...

Cobalt, like iron, yields complex cyanide derivatives known respectively as cobalto-eyanides,M4Co(CN)(),andcobalti-cyanides, M3Co(CN)s. Of these, the latter alone are important. Rhodium and iridium in a similar manner yield rhodi-cyanides, M3Rh(CN)6, and iridi-cyanides, M3Ir(CN]6. 

The preceding results fall considerably short of the modem standard of atomic weight work, and further determinations of the atomic weight of iridium are desirable. Archibald,4 in 1909, announced that he had determined the value Ir = 192-90 from analyses of potassium iridi-chloride, but no details of the work have yet been published. 

Hydrogen Iridi-nitrite, II3Ir(N02)6, is stated by Gibbs6 to crystallise in yellow prisms which are readily soluble in water. The hydrogen may be replaced by metals yielding a series of salts known as iridi-... 

Potassium Iridi-nitrite, K3Ir(N02)6, which is conveniently prepared by adding sodium nitrite to a hot acidulated solution of sodium ehlor-iridite until it is bleached. The solution is boiled to expel nitrous oxides, and potassium chloride is added in excess, whereupon iridium potassium nitrite is precipitated as a white mass. 

Sodium Iridi-nitrite, Na3Ir(N02)fi.H20, is readily prepared by adding sodium nitrite to a solution of iridium sulphate in the warm. It is readily soluble in water.3... 

Ammonium Iridi-nitrite, (NHJ3Ir(NOJ)6, may be prepared by addition of sodium nitrite and ammonium sulphate to a warm solution of iridium sulphate. It separates out as a white powder, similar to the potassium salt.4 When boiled with water it evolves nitrogen, and heated in the dry state it detonates. 

Iridium and the Halogens—Clilor-iriditcs—Chlor-iridatcs --Iridium and Oxygon —Iridium and Sulphur—Double Nitriles-Tridium and Phosphorus -Iridi-oyanides. 

The iris separates the anterior and posterior chambers and consists of the pigmented epithelial cell layer, the iridial sphincter and dilator muscles, and the stroma. The amount of melanin present in the stroma determines the color of the iris few... 

Phosphino enolate complexes such as (21-XXIII) catalyze the transfer dehydrogenation of cyclooctane with norbornene at 60-90°C under H2 pressure.136 Iridi-um(III) dihydrides with P—C—P chelate ligands of type (21-VIII) are thermally stable at 150-200°C and catalyze the dehydrogenation of cyclooctane at rates of up to 12 turnovers min-1 (200°C). The transfer-dehydrogenation of ethylcyclohexane with this catalyst gives ethylcyclohexenes, EtPh, and styrene.137 Mechanistic studies of the transfer dehydrogenation of cyclooctane with CH2=CHBu in the presence of IrH2ClL2 indicate that cyclooctane coordination is required for the reductive... 

Absence of dilation to psychosensory stimuli Conjunctival hyperemia Facial or body anhidrosis Heterochromia iridis, if congenital... 

Iridis florentinse in pulverem tritas uncias novem. 

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