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  • 1995-1999  (3)
  • Chemistry  (2)
  • Key words Autologous chondrocyte transplantation • Osteochondral lesions • Chondrocytes • Osteoarthritis • Therapy  (1)
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  • 1
    ISSN: 1433-044X
    Keywords: Key words Autologous chondrocyte transplantation • Osteochondral lesions • Chondrocytes • Osteoarthritis • Therapy ; Schlüsselwörter Autologe Chondrozytentransplantation ; Osteochondrale Läsion ; Chondrozyten ; Arthrose ; Therapie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Gelenkknorpeldefekte gelten als schwer zu therapieren. Die Regenerationspotenz des Knorpelgewebes ist gering und führt zur Bildung von mechanisch minderwertigem Faserknorpel. Die etablierten Behandlungsmethoden können zwar die Bildung von Faserknorpel induzieren, die Entstehung einer Arthrose jedoch nicht verhindern. Die autologe Chondrozytentransplantation (ACT) stellt gegenwärtig das vielversprechendste klinisch einsetzbare neue Verfahren dar, mit welchen ein dem hyalinen Gelenkknorpel sehr ähnliches Regeneratgewebe im Defektbereich gebildet werden kann. Die jetzt vorliegenden wissenschaftlichen Ergebnisse zeigen über einen Nachuntersuchungszeitraum von 2–10 Jahren zu 90 % gute und sehr gute klinische Ergebnisse bei Anwendung an der Femurkondyle und ca. 70 % gute und sehr gute Ergebnisse bei der Behandlung von patellaren Knorpelschäden. Die Festigkeit dieses Regenerats liegt mit Werten von 2,77 N sehr nahe an Werten für gesunden hyalinen Gelenkknorpel (3,08 N). Bei strenger Indikations-stellung rechtfertigen die vorliegenden mittelfristigen Ergebnisse bereits jetzt einen klinischen Einsatz an speziellen Zentren. Ob diese Methode die Entstehung einer Arthrose verhindern kann, müssen die langfristigen Ergebnisse zeigen.
    Notes: Summary The treatment of deep cartilage defects is a challenge for every orthopeadic surgeon. The potention for regeneration of cartilage tissue is minimal and leads to mechanically inferior fibrous tissue. The established techniques induce the growth of fibrous tissue but fail to prevent arthrosis. Autologous chondrocyte transplantation seems to be the most promising therapy concept with clinical relevance to reserves a full thickness cartilage defekt with hyaline-like cartilage. Outcome studies with a follow up from 2–10 years show in up to 90 % good and excellent results for defects on the femoral condyle and 70 % for the patella. Mechanical testing of the regenerated cartilage showed almost simular stiffness as nearly normal hyaline cartilage. The available data justify the acceptance of autologous chondrocyte transplantation as a standard procedure for limited indications and well-trained surgeons. Result of already inaugurated studies will show the potential of chondrocyte transplantation to prevent osteoarthritis.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 37 (1995), S. 377-382 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The analysis of known protein structures is a very valuable and indispensable tool for deciphering the complex rules relating sequence to structure in proteins. On the other hand, the design of novel proteins is certainly the most severe test of our understanding of such rules. In this report we describe our own attempt to develop appropriate tools for the investigation of known protein structure properties and their applications to the design of a novel, all β protein. The success of the design project is a demonstration of the usefulness of careful analysis of the data base of known protein structures. © 1994 John Wiley & Sons, Inc.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 32 (1998), S. 414-424 
    ISSN: 0887-3585
    Keywords: P1 nuclease ; X-ray crystallography ; substrate recognition ; catalytic mechanism ; thiophosphorylated oligonucleotides ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The reaction mechanism of nuclease P1 from Penicillium citrinum has been investigated using single-stranded dithiophosphorylated di-, tetra-, and hexanucleotides as substrate analogs. The complexes crystallize in tetragonal and orthorhombic space groups and have been solved by molecular replacement. The high resolution structures give a clear picture of base recognition by P1 nuclease at its two nucleotide-binding sites, especially the 1.8 Å structure of a P1-tetranucleotide complex which can be considered a P1-product complex. The observed binding modes are in agreement with a catalytic mechanism where the two closely spaced zinc ions activate the attacking water while the third, more exposed zinc ion stabilizes the leaving 03' oxyanion. Stacking as well as hydrogen bonding interactions with the base 5' to the cleaved phosphodiester bond are important elements of substrate binding and recognition. Modelling of a productive P1-substrate complex based on the solved structures suggests steric hindrance as the likely reason for the resistance of Rp-phosphorothioates and phosphorodithioates. Differences with the highly homologous nuclease S1 from Aspargillus oryzae are discussed. Proteins 32:414-424, 1998. © 1998 Wiley-Liss, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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