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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 52 (1991), S. 117-121 
    ISSN: 1432-0649
    Keywords: 42.60D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A colliding pulse mode-locked ring dye laser, pumped by an all-line small frame Ar+ laser has been used to generate stable pulses as short as 49 fs with pulse duration and stability similar to those obtained with the usual configuration where a single line of the pump is used. The effects of cavity alignment on the absorber saturation are presented and explained in terms of an analysis of stability of the ring cavity.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0340-1855
    Keywords: Schlüsselwörter Präzision ; Variationskoeffizient ; DEXA ; Osteoporose ; Polyarthritis ; Key words Precision ; coefficient of variation ; DEXA ; osteoporosis ; rheumatoid arthritis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Precision of osteodensitometric measurements using dual energy X-ray absorptiometry (DEXA) depends on various known factors, such as positioning, aortic calcification or vertebral fractures. The purpose of this study was to investigate the influence of various diseases or bone density on the reproducibility of measurements in the lumbar spine and the proximal femur.  Measurements in the LWS p.a., LWS lat. and at Ward‘s triangle were made in a total of 100 patients. The subjects were repositioned between measurements. In order to be able to determine the influence of various diseases, four groups of 25 patients each were formed: three with the diagnosis osteoarthrosis, osteoporosis and rheumatoid arthritis and one control group. The mean percentual difference and coefficient of variation were calculated as the measure for reproducibility.  Mean percentual differences of 0.18 to 2.6% were found in the four groups at the three measurements sites. After calculation of coefficient of variation, a value between 1.2 and 2.7% was found for LWS p.a., between 7.1 and 15.7% for LWS lat. and between 4.1 and 9.9% at Ward‘s triangle. It was also conspicuous that the difference in coefficient of variation in osteoporosis patients was nearly double that in the control group in all measured areas. Conclusion: Lateral lumbar spinal measurements using DEXA cannot presently be recommended. LWS p.a. measurements and, with limitations, measurements at Ward‘s triangle have good precision and could be used for course documentation of bone density.
    Notes: Zusammenfassung Die Präzision osteodensitometrischer Messungen mit der dual energy X-ray absorptiometry (DEXA) hängt von verschiedenen bekannten Faktoren, wie Lagerung, Aortenverkalkung oder Wirbelkörperfrakturen ab. Ziel der Untersuchung war, den Einfluß verschiedener Erkrankungen bzw. der Knochendichte auf die Reproduzierbarkeit der Messungen an der Lendenwirbelsäule und am Femur zu überprüfen.  Insgesamt wurden 100 Patienten an der LWS p.a., LWS lat. und am Ward‘schen Dreieck doppelt gemessen, wobei zwischen den Messungen neu positioniert wurde. Um den Einfluß unterschiedlicher Erkrankungen festzustellen zu können, wurden zusätzlich 4 Gruppen à 25 Patienten mit den Diagnosen: Arthrose, Osteoporose und chronische Polyarthritis im Vergleich zur Kontrollgruppe gebildet. Als Maß für die Reproduzierbarkeit wurde jeweils die mittlere prozentuale Differenz und der Variationskoeffizient der beiden Messungen berechnet.  In den vier Gruppen ergaben sich an den drei Meßorten mittlere prozentuale Differenzen von 0,18 bis 2,6%. Nach Berechnung der Variationskoeffizienten fand sich für die LWS p.a. ein Wert zwischen 1,2 und 2,7% für die LWS lat. zwischen 7,1 und 15,7% und am Ward‘schen Dreieck zwischen 4,1 und 9,9%. Auffällig war zudem ein nahezu doppelt so hoher Variationskoeffizient der Patienten mit Osteoporose im Vergleich zur Kontrollgruppe an allen gemessenen Regionen. Ergebnis: Die laterale LWS-Messung beim DEXA-Verfahren ist derzeit nicht zu empfehlen. Die LWS p.a.-Messung und mit Einschränkung auch die Messung am Ward‘schen Dreieck können bei guter Präzision zur Verlaufsdokumentation der Knochendichte herangezogen werden.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0340-1855
    Keywords: Schlüsselwörter Diclofenac ; in vitro ; Osteoblasten ; stromale Knochenmarkzellen ; Hüftprothektik ; Key words Diclofenac ; in-vitro ; osteoblasts ; bone marrow cells ; hip arthroplasty
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Introduction: Results of animal experiments have demonstrated that the osseous integration of non-cemented prostheses can, at the very least temporarily, be impaired by the application of non-steroidal antiphlogistic agents (such as diclofenac). It is the objective of this study to examine whether there is a direct influence of diclofenac used in usual clinical dosages (3 times 50 mg daily) on bone cells and their progenitor cells which would explain the observed slow integration of the prostheses. Methods: To investigate this, cultivated human in vitro osteoblasts and stromal bone marrow cells were incubated with increasing doses of the medications. Our study focused on the effect of diclofenac application on proliferation and functional metabolism in both cell lines. The measurable maximal plasma concentration 2h after the application of one tablet Voltaren 50® reached 1.6μg/ml. This correlated with diclofenac concentrations between 1 and 10 ml found in our experiments. The detected values were correlated to the control group (0 μg/ml diclofenac). Results: The drug effect upon osteoblasts was higher than on progenitor cells. The proliferation of in vitro stromal bone marrow cells, compared to untreated cells, was found to be decreased. We observed a decrease to 82% at a diclofenac concentration of 1 μg/ml, Osteoblasts exhibited a decrease to 97,5% at the same concentration. The DNA synthesis increased to 118% in stromal bone marrow cells, in osteoblasts to 144%. In contrast, we detected a neglectible decrease to 92% in the collagen synthesis of osteoblasts compared to untreated cells. The synthesis of osteocalcin by osteoblasts increased to 119%. The alkaline phosphatase activity was found to be decreased to 88% in stromal bone marrow cells and increased in osteoblasts to 111%. Conclusion: Temporary inhibiting effects on osseous integration in non-cemented prosthesis by diclofenac could be caused by a disturbance in the anabolic bone metabolism, exhibited by an increase of osteoblastic osteocalcin expression. Osteocalcin as a known negative regulator of the osteoneogenesis is most likely inhibiting the collagen matrix deposition.
    Notes: Zusammenfassung Einleitung: Nichtsteroidale Antiphlogistika (NSAR, z.B. Diclofenac) können das knöcherne Einwachsen nicht zementierter Prothesen zumindest vorübergehend beeinträchtigen. Es wird untersucht, ob ein direkter Einfluß von Diclofenac, in üblicher klinischer Dosierung (3×50 mg), bzw. der dadurch maximal erreichbaren Plasmakonzentration auf Knochenzellen und ihre Progenitoren besteht. Methoden: In-vitro kultivierte humane Osteoblasten und stromale Knochenmarkzellen wurden mit steigenden Medikamentendosierungen inkubiert und deren Wirkung auf das Proliferationsverhalten sowie Funktionsstoffwechsel gemessen. Die, durch Einnahme eines Dragees Voltaren 50®(Diclofenac) im Mittel nach 2 Stunden meßbare maximale Plasmakonzentration beträgt 1,6 μg/ml (26). Dies entspricht Diclofenackonzentrationen von etwa 1 μg/ml in unseren Experimenten. Die ermittelten Werte werden auf die Kontrollgruppe (0 μg/ml Diclofenac) bezogen. Ergebnisse: Die Wirkung von Diclofenac auf Osteoblasten ist bei allen Versuchen ausgeprägter als auf Vorläuferzellen. Die Proliferation stromaler Knochenmarkzellen wird bei Diclofenackonzentrationen von 1μg/ml auf 82%, bei Osteoblasten auf 97,5% reduziert. Die DNA-Synthese stromaler Knochenmarkzellen erhöht sich bei 1 μg/ml Diclofenac auf 118%, bei Osteoblasten auf 144%. Die Kollagensynthese der Osteoblasten wird auf 92% gesenkt. Die Osteocalcinsynthese der Osteoblasten steigt auf 119%. Die Aktivität der Alkalischen Phosphatase sinkt bei stromalen Knochenmarkzellen auf 88%, bei Osteoblasten steigt sie auf 111%. Schlußfolgerungen: Die zumindest während der Medikamentengabe verminderte Implantat-Knochen-Haftung könnte in einer Störung des anabolen Knochenstoffwechsels begründet sein, was sich in einer signifikanten Zunahme der spezifischen Osteocalcinexpression zeigt. Osteocalcin inhibiert als Negativ-Regulator der Osteogenese vermutlich die kollagene Matrixablage.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 86 (1979), S. 1199-1205 
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 116 (1983), S. 1007-1012 
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 78 (1977), S. 177-184 
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 102 (1981), S. 348-354 
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Comparative Biochemistry and Physiology -- Part B: Biochemistry and 76 (1983), S. 483-487 
    ISSN: 0305-0491
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Comparative Biochemistry and Physiology -- Part B: Biochemistry and 69 (1981), S. 737-746 
    ISSN: 0305-0491
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Comparative Biochemistry and Physiology -- Part B: Biochemistry and 69 (1981), S. 753-760 
    ISSN: 0305-0491
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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