In an aim to create a "sharp" molecular knife, we have studied site-specific fragmentation caused by Si:2p core photoionization of bridged trihalosilyltrimethylsilyl molecules in the vapor phase. Highly site-specific bond dissociation has been found to occur around the core-ionized Si site in some of the molecules studied. The site specificity in fragmentation and the 2p binding energy difference between the two Si sites depend in similar ways on the intersite bridge and the electronegativities of the included halogen atoms. The present experimental and computational results show that for efficient "cutting" the following conditions for the two atomic sites to be separated by the knife should be satisfied. First, the sites should be located far from each other and connected by a chain of saturated bonds so that intersite electron migration can be reduced. Second, the chemical environments of the atomic sites should be as different as possible.
Results from the present study revealed that rat oatp-E is localized mainly to the corneal epithelium, ciliary body, iris, and retina. Furthermore, the findings appear to suggest that transport of T3 in the RPE may have a functional role for organic anion (i.e., thyroid hormone) transport in the rat eye.
These results indicate that nipradilol has a possibility of neuroprotective effect on axotomized RGCs, and the effect depended mainly on its NO-donor property.
A 56-year-old Japanese man was diagnosed as having hereditary ceruloplasmin deficiency. His ceruloplasmin concentration was below the lower limit of detection. Serum copper and iron concentrations were below normal, but the ferritin concentration was highly elevated. An ophthalmoscopic examination showed retinal degeneration with yellowish discoloration of the fundus in both eyes. Fluorescein angiography demonstrated a dark choroid in the posterior pole. Geographic areas of window defects were seen in the midperipheral fundus. The retinal degeneration in this patient was thought to be caused by the cellular iron deposition that occurred as a result of ceruloplasmin deficiency.
SUMMARY A 47-year-old Japanese man had a progressive degeneration of the retina and choroid along the retinal veins associated with uveitis of two years' duration. The lesion was characteristic of paravenous retinochoroidal atrophy: a contiguous atrophy of the retinal pigment epithelium and choroid of one-half to one disc diameter in size was present along most of the veins from the posterior pole to the far periphery. Fluorescein angiography showed a window defect in the retinal pigment epithelium, with hyperfluorescence representative of retinal pigment epithelium and choriocapillaris degeneration. Good visual acuity was attained after extracapsular cataract extraction for complicated cataract and vitrectomy for severe vitreous opacity had been performed in both eyes. The cause of this new inflammatory disease was unknown.Pigmented paravenous retinochoroidal atrophy'" is a rare condition in which the atrophic areas extend one-half to one disc diameter on either side of the vein and follow the vein's course, even when it branches. The cause of the condition is still unknown. ' We examined a patient who had gradually progressive paravenous retinochoroidal atrophy accompanied by an active panuveitis of more than two years' duration. We believe ours is the first report to describe active inflammatory causes of paravenous retinochoroidal atrophy.
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