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  • 1
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 580 (1990), S. 0 
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    facet.materialart.
    Unbekannt
    Baltimore : Periodicals Archive Online (PAO)
    Human Biology. 53:1 (1981:Feb.) 137 
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 111 (1984), S. 0 
    ISSN: 1365-2133
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Vitamin A and several other retinoids were added to fibroblast cultures in order to study possible alterations in biochemical properties and cellular responsiveness. The proliferation of cells was inhibited as the concentration of retinoids increased from 10-9 to 10-5mol/l. Synthesis of non-collagenous proteins and production of both type I and type III collagen were decreased. The onset of type III collagen synthesis by tendon fibroblasts in culture was delayed. Furthermore, the chemotactic response of fibroblasts to fibroblast-conditioned medium was markedly reduced in the presence of retinoids (10−6 to 10−12 mol/l).
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 338 (1980), S. 0 
    ISSN: 1749-6632
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Allgemeine Naturwissenschaft
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular medicine 59 (1981), S. 91-93 
    ISSN: 1432-1440
    Schlagwort(e): Collagen synthesis ; Fibroblast cultures ; Osteogenesis imperfecta ; Kollagensynthese ; Fibroblastenkulturen ; Osteogenesis imperfecta
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Hautfibroblasten wurden von 13 Patienten mit Osteogenesis imperfecta gezüchtet und deren Kollagensynthese in vitro untersucht. Dabei fand sich bei 7 Patienten, die durch nur milde Manifestation der Erkrankung charakterisiert waren, eine Störung des Verhältnisses der Kollagentypen I und III. Fibroblasten von solchen Patienten mit einer schweren Form der Osteogenesis imperfecta synthetisierten die Kollagentypen I und III in einem normalen Verhältnis.
    Notizen: Summary Skin fibroblasts were cultured from 13 patients with Osteogenesis imperfecta and collagen biosynthesis was investigated in vitro. In those patients characterised by only mild manifestations of the disease, the ratio of collagen types I and III was disturbed. By contrast, fibroblasts obtained from patients with Osteogenesis imperfecta of a more severe type synthesised collagen types I/III in a normal ratio.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular medicine 59 (1981), S. 83-90 
    ISSN: 1432-1440
    Schlagwort(e): Collagen ; Marfan's syndrome ; Fibroblasts ; Aortic-aneurysm ; Kollagen ; Marfan-Syndrom ; Fibroblasten ; Aorten-Aneurysma
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Der Fallbericht einer 33jährigen Frau mit einem ausgeprägtem Marfan-Syndrom wird vorgestellt. Sie hatte typische ossäre, okuläre, kardiovaskuläre und auch pulmonale Veränderungen, auf deren Bedeutung näher eingegangen wird. Wegen einer schweren Aorteninsuffizienz bei einem Aneurysma der Aorta ascendens und einer beträchtlichen Mitralinsuffizienz wurde ein Doppelklappenersatz durchgeführt und eine Prothese der Aorta ascendens eingesetzt. Die Prognose, die diagnostischen und therapeutischen Möglichkeiten der lebensbedrohlichen kardiovaskulären Komplikationen bei Marfan-Syndrom werden diskutiert. Das bei der Operation gewonnene Aortengewebe wurde histologisch und biochemisch analysiert. Histologisch zeigte sich eine typische Medianekrose. Biochemisch (Fibroblastenkultur, Elektronenmikroskopie) fand sich eine veränderte Zusammensetzung der kollagenen Anteile. Sowohl in der Adventitia wie in der Media war Kollagen Typ I nahezu völlig zugunsten von Kollagen Typ III verschwunden. Diese Verschiebung galt in gleicher Weise für die Prokollagene. In der Haut der Patientin fand sich jedoch eine normale Verteilung von Prokollagen und Kollagen der Typen I und III. Die weitgehende Reduktion von Kollagen Typ I stellt möglicherweise die Ursache der Wandschwächung der Aorta dar, die die Ursache der Aneurysmabildung und der Aorteninsuffizienz ist.
    Notizen: Summary The case report on a 33 year old woman with prominent features of Marfan's syndrome is presented. Characteristic signs were seen in the bones, the eyes, the cardiovascular system, and the lungs. Due to regurgitation of both the aortic and mitral valves and an aneurysm of the ascending aorta a double valve replacement was made, including a prothesis of the aorta. The problems of early diagnosis and therapy of the life-threatening cardiovascular complications are discussed. Tissue specimens from the aorta were analysed histochemically and biochemically. Histology showed a typical necrosis of the media with cyst formation. Biochemical analysis by in vitro labeling of collagen in tissue explants and by electon microscopical evaluation showed proportions of type I and type III collagen which were significantly different from controls. In both the media and the adventitia the amount of type I collagen was drastically reduced as shown by quantitation of collagen and procollagen. Fibroblasts derived from the skin of the patient showed a normal content of type I and type III collagen. It is conceivable that the reduced content of type I collagen in the aortic wall is responsible for the weakness of the vessel wall causing formation of aneurysm and its sequelae.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 7
    ISSN: 1432-2307
    Schlagwort(e): Acromegaly ; Osteoporosis ; Collagen type II ; Lysyl hydroxylation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Although it is now 60 years after Erdheim's (1931) detailed description of vertebral alterations in severe acromegaly, it is still unclear whether osteoporosis is a consistent feature of acromegalic bone disease or not. We studied the vertebral trabecular bone of a 44-year-old woman who had suffered active acromegaly for more than 20 years, and compared it with 17 normal as well as 2 osteoporotic controls. Histomorphometry revealed a very low trabecular bone volume and thus documented the presence of osteoporosis. The mean trabecular plate thickness was strikingly increased in acromegaly (possibly caused in part by a low-dose fluoride treatment), whereas it was normal or reduced in the osteoporotic controls. The meticulous analysis showed islands of cartilaginous tissue in the core of the acromegalic trabeculae which were not present in any other sample. In these areas collagen II was detected by immunohistochemistry. Biochemical analysis revealed that collagen II accounted for 7% of the total collagenous matrix. The degree of hydroxylation of lysyl residues of collagen I was close to the average value of all control samples studied. Our data show that osteoporosis can occur in acromegaly and that it is characterized by unusual architectural and compositional features. These findings challenge the prevailing view that the matrix of osteoporotic bone always shows a normal composition.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Archives of dermatological research 286 (1994), S. 425-428 
    ISSN: 1432-069X
    Schlagwort(e): Ehlers Danlos syndrome ; Collagen
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract A patient suffering from a severe form of Ehlers-Danlos syndrome is presented (EDS type VII). The presence of bilateral congenital hip dislocation, generalized joint hypermobility and a soft hyperelastic skin with abnormal scarring suggested a specific collagen type I defect. SDS-PAGE analysis of collagens secreted into the medium of fibroblast cultures showed a retarded migration of more than half of the α2(I) chains. CNBr peptide mapping of the HPLC-purified altered chain localized the mutant locus to the N-terminal region of the protein. cDNA analysis of the corresponding gene COL1A2 revealed, in addition to the expected collagen sequence, a transcript missing the entire exon 6. This exon encodes a major crosslinking site within collagen fibres as well as the N-propeptidase cleavage site. The skipping of exon 6 is caused by a splice site mutation substituting an A for a G at the first nucleotide of intron 6.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 9
    ISSN: 1432-069X
    Schlagwort(e): Relapsing polychondritis ; Autoantibody ; Collagen ; Cartilage
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Relapsing polychondritis is a systemic disease associated with a destruction of cartilage in various parts of the body. Sera from six patients with relapsing polychondritis and one patient with microscopic polyarteritis nodosa as well as from six controls were analyzed by immunoblotting and ELISA. All patients had autoantibodies against native collagens II and IX. The serum from one patient showed a strong reaction with all three collagen chains of the high molecular weight fraction of collagen IX after denaturation; sera from four patients showed autoantibodies against α2 (XI) and sera from three patients showed autoantibodies against the covalently cross-linked γ component of collagen XI. The presence of autoantibodies against collagens II, IX, and XI, which form the major fibrillar scaffold in cartilage and mediate the interaction of collagen fibrils and proteoglycan, suggests that autoantibodies against cartilaginous collagen may play a crucial role in the pathogenesis of relapsing polychondritis and microscopic polyarteritis nodosa.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Archives of dermatological research 286 (1994), S. 391-395 
    ISSN: 1432-069X
    Schlagwort(e): Collagen metabolism ; Collagen donor aging ; Skin physiology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Age-related differences in the composition and the post-translational modifications of human skin collagens were examined in the present study. The data were compared with results of collagen synthesis from in vivo-aged fibroblasts in culture. Skin extracts and newly synthesized collagen from fibroblast cultures derived from both old and young donor groups showed the same ratio of collagen III to collagen I. Furthermore, no difference was noted in the degree of prolyl and lysyl hydroxylation of collagen I and collagen III. Young and old fibroblasts synthesized a similar quantity of collagen in vitro. The data suggest that fibroblasts maintain a uniform level of collagen production, composition and modification independent of the age of the donor.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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