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  • Articles: DFG German National Licenses  (2)
  • Bats  (1)
  • Blood cell flux  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Knee surgery, sports traumatology, arthroscopy 1 (1993), S. 76-79 
    ISSN: 1433-7347
    Keywords: Laser flowmetry ; Arthroscopic measurement ; Microcirculation ; Blood cell flux ; Laser-Flowmetrie ; Mikrozirkulation ; Arthroskopische Messung ; Vorderes Kreuzband
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Sports Science
    Description / Table of Contents: Zusammenfassung Die Laser-Doppler-Flowmetrie gestattet den Nachweis der Durchblutung im mikrokapillären Bereich von Strukturen unter in vivo-Bedingungen. Wir verwendeten das Lasergerät der Firma Perimed (Schweden) und eine Spezialsonde um die kapilläre Durchblutung des vorderen Kreuzbandes während eines arthroskopischen Eingriffs nachzuweisen. Dabei erhält man Meßwerte in Millivolt, welche relativer Natur sind, ein absoluter Wert der Kapillardurchblutung in Volumen pro Zeiteinheit kann dadurch nich bestimmt werden. Unter standardisierten Bedingungen erfolgte bei 11 Patienten die Durchblutungsmessung und simultane Aufzeichnung auf einem 2-Kanal-Schreiber. In allen Fällen konnten herzsynchrone Pulsationen der kapillären Durchblutung des vorderen Kreuzbandes an 3 Meßpunkten nachgewiesen werden, welche bei Schließen der Blutsperre zur Gänze verschwanden. Wir fanden eine große individuelle Schwankungsbreite der sogenannten Blood-Cell-Flux-Werte von 30 mV bis 620 mV. Die Höhe der herzsynchronen Pulsationen schwankte zwischen 20 mV und 240 mV. Zwischen den einzelnen Meßpunkten oder zwischen den Fluxwerten und der Höhe der Pulsationen konnte nur ein vager Zusammenhang in der linearen Regressionsanalyse gefunden werden, kein Zusammenhang war zwischen den Fluxwerten und dem Blutdruck bzw. dem roten Blutbild nachzuweisen.
    Notes: Abstract Laser Doppler flowmetry permits observation of circulation in the microcapillary regions of structures under in vivo conditions. We used a laser device manufactured by the Swedish company Perimed and a special probe to observe the capillary circulation in the anterior cruciate ligament during arthroscopic surgery. This produces measured values in millivolts: these values are relative in nature and cannot be used to determine an absolute value for capillary circulation by volume per unit time. Under standardized conditions, circulation measurements and simultaneous recordings with a twochannel recorder were made from 11 patients. In all cases, pulsations of the capillary circulation synchronous with the heart beat could be seen on three measuring points on the anterior cruciate ligament; these disappeared upon complete deprivation of blood supply. We found a large individual range of variation in the so-called blood cell flux values from 30 to 620mV. The magnitude of the heart-synchronous pulsations ranged between 20 and 240 mV. Only vague linear relationships were found (a) between the individual measuring points and (b) between the flux values and the magnitude of pulsation; there was no relationship between the flux values and blood pressure and/or red blood count (erythrocyte count, hemoglobin, hematocrit).
    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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