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  • Nuclear Reactions  (2)
  • insulin secretion  (2)
  • Antigenität  (1)
  • B-cell volume  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Molecular and Cellular Endocrinology 28 (1982), S. 425-437 
    ISSN: 0303-7207
    Keywords: 3-isobutyl-l-methyl-xanthine ; insulin biosynthesis ; insulin secretion ; islets of Langerhans ; monolayer culture
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Physics, Section A 414 (1984), S. 333-346 
    ISSN: 0375-9474
    Keywords: Nuclear Reactions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Physics, Section A 112 (1968), S. 47-64 
    ISSN: 0375-9474
    Keywords: Nuclear Reactions
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0428
    Keywords: Pregnancy ; B-cell volume ; insulin ; Wistar rats ; streptozotocin administration ; islets ; DNA synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effect of pregnancy on pancreatic insulin content and relative B-cell volume has been studied in normoglycaemic Wistar rats treated with streptozotocin 14 days before mating. A single intravenous injection of streptozotocin (30 mg/kg body weight) caused a significant reduction of pancreatic insulin content and B-cell volume. The islet insulin content was 60% of control values. However, pregnancy-associated adaptation was preserved in these streptozotocin-treated animals. Plasma insulin levels, pancreatic insulin and B-cell volume were significantly enhanced compared with non-pregnant rats investigated on the same date. The incorporation of [3H]-thymidine into islets from pregnant rats (day 10.5) was higher than that in islets isolated from non-pregnant animals. After delivery insulin content and B-cell volume returned to pre-pregnant values. Also during a longer period after streptozotocin treatment (156 days), no measurable enhancement of B-cell volume and pancreatic insulin content was observed indicating the unresponsiveness of residual B cells to compensate spontaneously for the loss despite persisting normoglycaemia.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-0428
    Keywords: Pancreatic islets ; insulin secretion ; insulin content ; glucagon secretion ; glucagon content ; wistar rats ; sand rats ; glucose ; arginine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Isolated pancreatic islets of normoglycemic sand rats do not respond to 2.5 mM glucose with an enhanced glucagon secretion, which could be observed in normal Wistar rats. Arginine stimulates glucagon release in the presence of 2.5 mM glucose in Wistar rats as well as in sand rats. The secretion pattern is not caused by insulin deficiency since sand rat islets are characterized by an increased insulin secretion rate in vitro. This paradoxical glucagon secretion is not caused by a changed glucagon content but might be related to this species which is able to develop a diabetic syndrome spontaneously.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1434-3932
    Keywords: Schlüsselwörter Biokompatibilität ; Antigenität ; Polyester ; Kollagen ; Key words Biocompatibility ; Antigenicity ; Polyester ; Collagen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract At present there is neither an completely inert biomaterial available, nor does a universal test exist which objectively evaluates biocompatibility. One reason is the individuality of the host, especially with regard to the inflammatory response. Inflammation was found to induce biodegradation by hydrolysis or auto-oxidation of vascular prosthetic matrix after implantation. The present study was performed to investigate the specific humoral immune response after implantation of segments of a collagen-impregnated polyester prosthesis (Dacron) in Balb/c mice on experimental days 1, 18, 38, and 322. Serum antibody detection was performed by modified enzyme immunoassay using the prosthesis as a target. Specific polymer antibodies, enhanced by repeated implantations, could be detected in all mice which received grafts up to experimental day 322. These antibodies were not directed against the collagen coating. The antibody formation could be further enhanced by a combined administration of complete Freund's adjuvant together with the first implantation at experimental day 1. Results suggest that specific polymer antibodies, reflecting an inflammatory response, might be an additional parameter for biocompatibility testing of vascular prostheses.
    Notes: Zusammenfassung Bisher stehen keine komplett inerten Biomaterialien zur Verfügung und es existiert kein universeller Test zur Objektivierung der Biokompatibilität. Dies resultiert aus der individuellen Variabilität des Empfängerorganismus, insbesondere hinsichtlich der entzündlichen Reaktionsbereitschaft. Auch nach Implantation von Gefäßprothesen aus polymeren Biomaterialien kommt es zu einem chronischen Entzündungsprozeß. Dieser führt ursächlich durch Hydrolyse oder Autoxidation zur Biodegradation des Implantats. Mit unseren Untersuchungen galt es, eine möglicherweise bestehende, spezifische humorale Immunantwort nach Implantation von Segmenten einer kollagenimprägnierten Polyesterprothese (Dacron) in einem Tiermodell darzulegen. Balb/c-Mäusen wurde am 1., 18., 38. und 290. Versuchstag ein Prothesensegment intraperitoneal implantiert. Die Bestimmung der Serumantikörper erfolgte mit einem modifizierten Enzymimmunoassay unter Verwendung der Prothese als Target. Spezifische Antikörper gegen Polymere wurden nach wiederholter Implantation bei allen Tieren bis zum 322. Versuchstag nachgewiesen. Dabei konnte eine Antikörperbildung gegen die Kollagenimprägnierung ausgeschlossen werden. Die Antikörperbildung wurde durch den Zusatz von komplettem Freund-Adjuvans in Verbindung mit der ersten Implantation verstärkt. Der Nachweis von spezifischen Antikörpern gegen Polymere könnte zukünftig ein Parameter zur Testung der Biokompatibilität darstellen.
    Type of Medium: Electronic Resource
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