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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Graefe's archive for clinical and experimental ophthalmology 202 (1977), S. 9-18 
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung An 10 Cynomolgus-Affen wurde einseitig eine Trabeculo-Elektropunktur (TEP) durchgeführt. An 5 Kontrollaugen wurde die Elektrosonde ohne eine Funkentladung in den Schlemmschen Kanal eingeführt.An 5 anderen Kontrollaugen wurde ein Sklerafenster angelegt und der Schlemmsche Kanal geöffnet, es wurde jedoch keine Sonde eingeführt. Die Fazilität wurde vor der Operation und 2, 6 und 18 Wochen danach ermittelt. Die TEP hatte keinen längeren Einfluß auf die Fazilität. Eine Gonioskopie 5 Monate nach der Operation machte erhebliche Veränderungen in der Anatomie des Schlemmschen Kanals an den operierten Augen und an solchen Kontrollaugen deutlich, bei denen eine Sonde in den Schlemmschen Kanal eingeführt worden war. 6 Monate nach der Operation wurden 3 Affen getötet und die Augen für die Mikroskopie aufgearbeitet. Bei den Augen, bei denen eine Sonde in den Schlemmschen Kanal eingeführt worden war, waren dichte Gewebebrücken zwischen der Innenund Außenwand des Schlemmschen Kanals zu beobachten. Im Bereich einer TEP war das Trabekelwerk durch dichtes Narbengewebe ersetzt, welches aus unregelmäßigem feinen fibrillären Material, elastischen Fasern und Curly-Collagen bestand. Im Narbengewebe waren keine Intertrabekulärräume sichtbar. An einem Auge war im Bereich einer Funkentladungsstelle das Gewebe mit Endothel und einer Basalmembran gedeckt. Die Ergebnisse zeigen, daß der Mißerfolg der TEP an Affenaugen durch dichtes Narbengewebe bedingt ist, welches die durch die Funkentladung gebildeten Öffnungen verschließt.
    Notes: Summary Trabeculo-electropuncture (TEP) was performed in one eye of ten cynomolgus monkeys. In five control eyes, the TEP probe was inserted into Schlemm's canal and withdrawn without causing a spark discharge. In another five control eyes, a scleral window was produced and the canal was opened, but no probe was inserted. The gross facility of outflow was determined prior to the operation and 2, 6, and 18 weeks postoperatively. TEP had no longlasting effect on the facility. Gonioscopy five months after the operation revealed marked changes in the anatomy of Schlemm's canal in treated eyes and in control eyes subjected to probe insertion. Control eyes without probe insertion appeared normal. Six months postoperatively three monkeys were killed and the eyes investigated. Light and electron microscopy indicated that insertion of the probe with or without spark discharge resulted in the formation of dense bridges between the inner and outer walls of Schlemm's canal. At the sites of TEP, the trabecular meshwork was replaced by dense scar tissue containing irregular, fine fibrillar material, elastic fibres and large amounts of curly collagen. There were no intertrabecular spaces in the scar tissue. In one eye, one lesion was covered by a thin endothelium resting on a basal membrane. The results indicate that the failure of TEP in monkey eyes was due to the formation of dense scar tissue occluding the openings initially produced by the spark discharge.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Graefe's archive for clinical and experimental ophthalmology 215 (1981), S. 273-278 
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We have used the indirect immunperoxidase technique to examine the exfoliation syndrome and can demonstrate that the fibrils so typically found in this disease certainly contain basement membrane proteoglycans. This finding is interesting for two reasons: 1. For the first time, an electron-microscopical technique is described that is able to identify one protein component of the exfoliation material. 2. The fact that the basement membrane proteoglycans are present in the exfoliation material supports the hypothesis that this disease is caused by a disturbance in the biosynthesis of the basement membrane.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Graefe's archive for clinical and experimental ophthalmology 197 (1975), S. 71-81 
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Raster- und transmissionselektronenmikroskopisch werden 15 Kaninchenhornhäute nach Novesin 0,4%und 15 nach Chibro-Keracain in Abständen von 3, 6, 10, 15 und 60 min auf toxische Nebenwirkungen untersucht. Die Läsionen nach Keracain waren ausgeprägter und traten rascher ein. 60 min nach Applikation sind die Reparationsvorgänge bei Novesin weitgehendst abgeschlossen. Die Präparate nach Keracain zeigen zu diesem Zeitpunkt ein in seiner Funktion noch beeinträchtigtes Oberflächenepithel.
    Notes: Summary The toxic side-effects of 0.4% Novesine and Chibro-Kerakain were investigated by scanning- and transmission electron microscopy in 15 rabbit corneae each in intervals of 3, 6, 10, 15 and 60 mins. The lesions following Kerakain were larger and occurred earlier. After 60 mins, the specimens after Novesine application showed an almost complete repair process, whereas after Kerakain the epithelial surface appeared to be functionally impaired.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Graefe's archive for clinical and experimental ophthalmology 203 (1977), S. 181-190 
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Nine trabeculectomy samples, five iridectomy samples and one lens of an exfoliation syndrom were examined. Next to typical exfoliation syndrome fibrils, the alteration of endothelial membranes and similar structures has been pointed out. Concerning the glaucoma genesis, it is being discussed whether a participation of the trabecular network in the disease course might be a preliminary condition for the development of glaucoma and, thus, mere infiltration of exfoliation material into the trabecular network alone could be responsible for developing a glaucoma.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Graefe's archive for clinical and experimental ophthalmology 208 (1978), S. 9-13 
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Following reaction with peroxidase-coupled IgG antibodies, collagen of both type I and type II can be demonstrated light and electron-microscopically in the cornea of the mouse by means of purified, type-specific antibodies against collagen. Both type I and type II collagen seem to be evenly distributed in the cornea, with the amount of type I exceeding that of type II.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Graefe's archive for clinical and experimental ophthalmology 212 (1980), S. 143-148 
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Isolated collagen fibrils treated with type-specific antibodies can be stained using a peroxidase-antibody complex. The staining pattern of the fibrils with this peroxidase-antibody complex is demonstrated and compared with the normal negative staining pattern of the fibrils. The possible binding sites of the anticollagen antibodies on the fibrils is also discussed.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Graefe's archive for clinical and experimental ophthalmology 215 (1981), S. 243-248 
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In three rabbits a keratophakia as described by Barraquer (1972) was performed on both eyes, in one rabbit it was performed on one eye. In the right eye no cryoprotective agent was used, in the left eye the cryoprotective agent KM 26 was applied. Twelve hours after the operation, the majority of keratocytes in the tissue lens were destroyed. The nuclear chromatin was clumped, the cell membrane was destroyed and the cytoplasm showed vacuolar alteration; cell organelles were no longer recognizable. After 24 h hardly any keratocytes were found. All corneae operated on with and without a cryoprotective agent, showed the same morphology. The cell debris was removed by macrophages, which could be found earlier in corneae operated on without cryoprotection. Three weeks after keratophakia no increase in the number of the residual keratocytes had occurred.
    Type of Medium: Electronic Resource
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