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  • 1990-1994  (2)
  • 1965-1969  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Die Neubildung des Glaskörpers und seiner Fibrillen (1965)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 168 (1965), S. 521-528 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Also in severely diseased eyes with a liquefied vitreosus body, proliferating or proliferated cortical cells of the vitreous body may form normal-looking vitreous bodies rich in fibrils, in partly atypical places. If this newly formed vitreous body is under tension, the aspect is that of the zonule of Zinn; if there is no tension, the aspect corresponds to that of the normal structure of vitreous bodies (like crumpled cellophane).
    Notes: Zusammenfassung Auch in schwer erkrankten Augen mit verflüssigtem Glaskörper können proliferierende bzw. proliferierte Glaskörperrindenzellen an zum Teil atypischen Stellen regelrecht aussehenden, fibrillenreichen Glaskörper erzeugen. Steht dieser neugebildete Glaskörper unter Zug, dann entspricht das Bild dem der Zonula Zinnii; besteht keine Zugwirkung, dann entsteht ein Bild entsprechend der normalen Glaskörperstruktur (wie zerknautschtes Cellophanpapier).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02464818
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Die Strukturen des Glaskörpers in Beziehung zu embryonalen Blutgefäßen und Glaskörperrindenzellen (1969)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 177 (1969), S. 261-270 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Der Glaskörperraum wird von den Ästen der Arteria hyaloidea von hinten und den um den Augenbecherrand ziehenden Gefäße von vorne durchsetzt. Im Bereiche der und um die obliterierenden Blutgefäße der A. hyaloidea kommt es zu gerichtet verlaufenden Fibrillenzügen, die dem Glaskörpergerüst (Cloquetscher Kanal, gefältelte Membranen, Glaskörpergrenzmembran) entsprechen. Auch die Zonulafasern verlaufen dort, wo ehemals um den Augenbecherrand (Ora serrata) ziehende Blutgefäße (bis in Höhe des Kernbogens in der Linse) ansetzten. Die Tunica vasculosa lentis wird später zur Zonulalamelle der Linse. Die Fibrillen des Glaskörpergerüstes und der Zonula werden dabei von Fibroblasten (Hyalocyten) gebildet, die im Bereiche der ehemaligen Gefäße vermehrt vorhanden bleiben. Eventuell kommen auch die Gefäßendothelien für die Fibrillenentstehung in Betracht. Auch der sekundäre Glaskörper wurde zunächst von Gefäßen durchzogen, die nur frühzeitig obliterierten.
    Notes: Summary The space of the vitreous body is permeated posteriorly by the branches of the hyaloid artery and anteriorly by the vessels of the margin of the eye cup. In the region of and around the obliterating blood vessels of the hyaloid artery a directed fibrillogenesis occurs, corresponding to the structure of the vitreous body (Cloquet's canal, folded membranes, limiting membrane of the vitreous body). Also the zonula fibres are found where formerly vessels located around the margin of the eye cup (ora serrata) adjoined the lens (up to the height of the nuclear arch in the lens). The tunica vasculosa lentis later on becomes the zonula lamella of the lens. The fibrils of the structure of the vitreous body and of the zonula here are formed by the fibroblasts (hyalocytes), which remain to an increased degree in the region of the former vessels. Perhaps also endothelia of the vessels may be considered the origin of the fibrillae. Also the secondary vitreous body at first was permeated by vessels which, however, obliterated early.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00571790
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Die Strukturen der Zonula in Beziehung zu embryonalen Blutgefäßen und Glaskörperrindenzellen (1969)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 178 (1969), S. 44-50 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung An Hand von histologischen Bildern wird gezeigt, daß die Zonulafasern topographisch zwei verschiedenen embryonalen Blutgefäßarealen entsprechen: 1. Den von vorne um den Augenbecherrand (spätere Ora-Ciliarkörper) ziehenden und 2. den von der Tunica vasculosa lentis zur Netzhaut ziehenden. Die nach hinten liegende Grenze der zuletzt genannten Gefäße wird dabei zur Glaskörpergrenzmembran. Die Zonulafibrillen dürften im wesentlichen durch Fibroblasten, die im Bereiche ehemaliger Blutgefäße vermehrt liegenblieben, gebildet werden.
    Notes: Summary With reference to histological pictures it is demonstrated that topographically the zonular fibers correspond to two different embryonal blood vessel areas: 1. to the vessels which take their course from the front around the margin of the eye-cup (which later on becomes the ora serrata and the ciliary body) and 2. to the vessels which extend from the tunica vasculosa lentis to the retina. Hereby, the posterior limit of the last-mentioned vessels becomes the limiting membrane of the vitreous body. The zonular fibrils should be formed essentially by fibroblasts which have been left in particular in the area of former blood vessels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00428044
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Different regional changes of fluorescence spectra of clear human lenses and nuclear cataracts (1993)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 231 (1993), S. 656-661 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Fluorescence spectra are recorded from the cortex and nucleus of the same human lenses [clear and cataracta brunescens (nigra) with colorless cortex]. When comparing clear cortices with either the harder nucleus of a clear lens, or a cataracta brunescens for a given excitation wavelength, a shift of the fluorescence maxima of the nucleus to longer wavelengths is observed. The shift appears to be independent of the degree of coloring since it is very similar for different nuclei, and it is not increased in cataracta nigra. The fluorescence intensities are similar when comparing the clear cortex of clear lenses and cataracta brunescens. For the nuclei, however, the intensity increases by up to four to six times with increasing coloring. For constant excitation wavelength, the fluorescence band maximum of the nucleus (of clear lenses and of cataracta brunescens) exhibits roughly the same shift to longer wavelengths as that of the cortex. Upon 320 nm excitation the fluorescence intensity of a cataracta nigra is about twice that of a clear lens of juvenile age. Upon 380 nm excitation the factor increases to four. Therefore in older and colored lens nuclei a red shift of the fluorescence maximum with increasing excitation wavelength is observed. We discuss whether or not the changes in the molecular proteins, in addition to advanced glycolization end products, may be responsible for the different fluorescence properties (and the brown color) with increasing age.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00921961
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The increasing sclerosis of the human lens with age and its relevance to accommodation and presbyopia (1991)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 229 (1991), S. 294-296 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract By means of a fine conical probe and a miniature dynamometer, the resistance to penetration of different lens layers was measured. In clear human lenses the power of resistance of the lens nucleus increases with age, mostly due to the “hardening” of the nucleus. A distinct hardening of the nucleus as opposed to the cortex has been found to occur in lenses as young as 20 years of age. This “firmness” of the lens nucleus, occurring between the ages of 20 and 60 years, coincides with the decrease in accommodation range and the onset of presbyopia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00167888
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    Paper (German National Licenses)
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