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  • 1
    ISSN: 1435-2451
    Keywords: Trauma ; Wundheilung ; Granulozytenfunktion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es wurde die Trauma-bedingte Auswirkung auf Migrationsparameter neutrophiler Granulozyten (PMN) und auf die PMN-Elastase-Freisetzung untersucht, mit dem Ziel, eine akute Entzündungsreaktion von Anbeginn an bis zur Erholungsphase im Verlauf zu kontrollieren. 15 Patienten, die sich einem unfallchirurgischen Eingriff, gefolgt von blander Wundheilung, unterzogen, dienten als Entzündungsmodell. Die Erfassung des PMN-Aktivierungsgrads erfolgte im Vollblut durch Messung ihrer Migrationsbereitschaft (TMI) und ihres Eindringvermögens (DC) in ein Membranfiltersystem, welches ein Chemotaxindepot (FMLP) beinhaltete. Kontrollkammern waren FMLP-frei und charakterisierten die Spontanmigration. Bei der gesunden Kontrollgruppe (n=64) nahm die Zahl der ins Filtersystem eingedrungenen PMN kontinuierlich von der oberflächlichsten bis zur tiefsten Schicht ab. FMLP beeinflußte die Mobilisierungsrßte der vom Blut ins Filtersystem eingewanderten PMN nicht, aber jene Zellen, die wanderten, drangen tiefer vor (p 〈 0.05). Nach dem Tauma war die spontane und FMLP-stimulierte DC erhöht (p〈0.05). Es war eine Tendenz, die PMN-Migrationsaktivität episodisch zu hemmen, bemerkbar. Eine Depression der unspezifischen Immunfunktion (niedrige TMI-Werte) fanden sich am 3. (p 〈 0.0001) und 12. postoperativen Tag (p 〈 0.01). Es bestand keine Korrelation zwischen den Migrationsparametern und dem Entzündungsmarker PMN-Elastase. Vorläufige Ergebnisse deuten darauf hin, daß die Analyse von PMN-Migrationsparametern im Vollblut-membranfilterassay ein wertvolles Attribut in der Verlaufskontrolle Trauma-assoziierter immunologischer Veränderungen repräsentieren könnte.
    Notes: Abstract We examined the effects of trauma on polymorphonuclear leucocyte (PMN) migratory parameters and PMN elastase release, with the aim of tracing an acute inflammatory reaction from its very beginning to the phase of recovery. Fifteen patients who underwent monotrauma surgery, followed by uneventful healing, served as inflammation model. PMN activation was studied by measuring their readiness to migrate (TMI) and their penetration potency (DC) in a whole blood membrane filter device, in which a chemoattractant depot (FMLP) was integrated. Control chambers lacking FMLP provided parameters of the spontaneous migration. In healthy controls (n = 64), the numbers of invading PMNs decreased continuously from the outermost layer towards the interior of the filter device. FMLP did not influence the mobilization rate of PMNs immigrant from the blood into the filter, but those cells that did migrate penetrated deeper (P 〈 0.05). After trauma, the spontaneous and FMLP-stimulated DC was increased (P〈0.05). Trauma also tended to inhibit PMN migratory activity episodically; depression of the unspecific immune function (low TMI values) was found on the 3rd (P〈0.0001) and 12th (P〈0.01) postsurgical days. There was no correlation between the migratory parameters and the inflammation parameter, PMN elastase release. Preliminary results indicate that analyses of PMN migratory parameters by a whole blood membrane filter assay could provide a valuable adjunct in monitoring trauma-associated immunologic changes.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1435-9456
    Keywords: Key words Communication ; Individual signature ; Recognition ; Social behaviour ; Bats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The remarkable cognitive abilities of bats indicate that they may recognise particular conspecifics. Because of their highly developed auditory system, it is obvious that vocalisations of bats may give information about the individual emitting them. In a field study of the social behaviour in the Indian false vampire bat (Megaderma lyra), two different types of vocalisation were recorded and analysed. The bats emitted these vocalisations only while aggregating with conspecifics inside the day roost. The “landing strophe” consisted of a number of brief multiharmonic downward frequency-modulated (FMdown) sounds which levelled off as a constant frequency (CF), and the “clatter strophe” was composed of a number of multiharmonic FMdown sounds which became shallow at the end as a short CF. The sounds of the landing strophe and the ¶clatter strophe differed in repetition rate, duration, harmonic components and frequency. Time pattern and peak frequency of the two sound types differed highly significantly between single, unidentified bats. The sounds were inter-individually distinct when the three parameters were combined as an acoustical space. Therefore, these vocalisations might be used for individual recognition in adult bats.
    Type of Medium: Electronic Resource
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