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  • 1
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: abstract  A multi-centre randomized clinical trial is under way at 14 university dental schools in Germany to compare prosthodontic treatments for the shortened dental arch (SDA). One of the aims of this pilot-study was to measure the effect of two treatment options of the SDA on oral health-related quality of life and on the Research Diagnostic Criteria (RDC) for temporomandibular disorders (TMD). Thirty-four patients participated in the pilot-study. Inclusion criteria were: all molars were missing and the presence of at least both canines and one premolar in each quadrant. Participants were randomly assigned to receive either removable partial dentures including molar replacement (RPD_group) or retain a premolar occlusion (PROC_group). The Oral Health Impact Profile (OHIP-49) and the RDC for TMD were completed by participants before treatment (pre-treatment), 6 weeks (6wks), 6 months (6m) and 12 months (12m) after treatment. At the 12-month follow up, data of 10 women and 11 men (mean age: 62 ± 10 years) were available. Medians of the OHIP total-scores were as follows: RPD (n = 10), 43·5 (pre-treatment), 18·2 (6wks), 13·3 (6m), 14·7 (12m). PROC (n = 11): 31·8 (pre-treatment), 27·1 (6wks), 8·8 (6m), 8·3 (12m). Significant differences were shown for RPD_group between pre-treatment and 6m/12m and for PROC_group between pre-treatment and 6m. There were no significant differences between treatment groups at any time. Within each group, an improvement of life-quality was observed. No significant difference could be reported between the two therapy concepts. This may be due to the low sample size within the pilot study.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 25 (1969), S. 942-943 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Mit Wasser-Glyzerin extrahierte fibrilläre Muskelfasern (Fasermodelle) vonLethocerus maximus zeigen im ATP-Bad nach plötzlicher Dehnung das Phänomen der Dehnungsaktivierung, gefolgt von einer gedämpften, temperaturabhängigen isometrischen Oszillation der Kontraktionsspannung. Die Frequenz entspricht offenbar der Eigenfrequenz zyklisch tätiger « KontraktionsbrÜcken » zwischen Aktin und Myosin.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 319 (1970), S. 139-145 
    ISSN: 1432-2013
    Keywords: Muscle Oscillation ; Stretch-Activation of Muscle ; Contractile Mechanism ; Tension-Transients ; Muskel-Oscillation ; Dehnungsaktivierung des Muskels ; Contractiler Mechanisms
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Faserbündel des m. semitendinosus (Frosch) und des m. psoas (Kaninchen) wurden mit Wasser-Glycerin extrahiert und in ATP-Salzlösung suspendiert, bei freiem Calcium zwischen 10−7–10−6 M. Eine plötzliche Dehnung um 0,2–0,5% der Faserlänge bewirkte nach einem abrupten initialen Spannungsanstieg eine sekundäre, verzögerte Spannungszunahme; eine rasche Entspannung verursachte eine zunächst plötzliche und dann verzögerte Spannungsabnahme. Infolgedessen konnten die Fasern oscillieren; denn während sinusförmiger Längenänderungen (0,5%, 5–10 Hz) folgten die sinusförmigen Spannungsänderungen (phasenverschoben) nach — wie bei der myogenen Oscillation der Insektenmuskulatur.
    Notes: Summary Fibre bundles of frogs m. semitendinosus and rabbit psoas were extracted with glycerol and then suspended in ATP-salt solution at varying levels of free calcium. Abrupt stretch by 0.2–0.5% of the fibre length caused a (transient) delayed rise in tension and a quick release often produced a delayed tension fall. Consequently the extracted fibre system was able to oscillate since during sinusoidal length changes (0.5% at 5–10 c/sec) the sinusoidal tension changes lagged behind, as in myogenic oscillation of insect flight muscle.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 330 (1971), S. 217-229 
    ISSN: 1432-2013
    Keywords: Insect Fibrillar Muscle ; Mechanical Muscle Activation ; Muscle Oscillation ; Contractile Mechanism ; Cross-bridge Activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In isolated contractile structures of insect fibrillar muscle (DLM of Lethocerus) a quick extension causes a delayed rise of tension which is often followed by (damped) isometric oscillations. Similar phenomena may be also observed after a quick release which causes an immediate tension fall followed by a small and nearly immediate tension recovery passing into oscillation. The oscillation frequency has a temperature coefficient (Q 10) of about 3.5 but depends also on the nature of the muscle (8 Hz in DLM of Lethocerus maximus at 20° C; 14 Hz in DLM of Lethocerus annulipes); it is further affected by the ATPase reaction products but not by calcium ions (range 10−6–10−5 M) nor by stretch, and it corresponds to the optimum myogenic oscillation frequency in driven oscillation experiments at 0.5% length change as well as to the wingbeat frequency of Lethocerus. All these findings agree with a previous hypothesis (Pringle) that myogenic oscillation — at least at low amplitude and optimal frequency — may be due to a more or less synchronized cross-bridge action. Evidence for partial cross-bridge synchronization during isometric oscillation stems from ATPase estimations in conjunction with measurements of the immediate elasticity (stiffness); these indicate that a maximal number of cross-bridges attaches almost immediately after stretch activation, and nearly in synchrony. The immediate series elasticity determined by quick releases suggests cross-bridge movements of the order 100 Å, in an oscillatory cycle. It is also concluded that contraction speed but not contractile tension is dependent on the turnover frequency of cross-bridges, if, indeed, the latter is reflected in the isometric oscillation frequency.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 325 (1971), S. 359-364 
    ISSN: 1432-2013
    Keywords: Contractile Mechanism ; ATP-ase ; Phosphate-Effects ; Insect Fibrillar Muscle ; Kontraktiler Mechanismus ; ATP-ase ; Phosphat-Wirkungen ; Fibrilläre Insektenmuskeln
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Anorganisches Phosphat hemmt die contractile Spannung und erhöht die Kontraktionsgeschwindigkeit und Oscillationsfrequenz glycerinierter fibrillärer Insektenmuskeln (Lethocerus maximus), während die mechanische Leistung und die ATPase-Aktivität kaum beeinflußt werden.
    Notes: Summary Inorganic phosphate in millimolar concentrations reduces contractile tension, but increases the speed and the oscillation frequency of glycerinated insect fibrillar muscle, while power output and ATPase are little affected.
    Type of Medium: Electronic Resource
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