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  • 1
    Electronic Resource
    Electronic Resource
    The trajectories of particles suspended in electrolytes under the influence of crossed electric and magnetic fields (1978)
    Springer
    European biophysics journal 4 (1978), S. 87-95 
    Details
    ISSN: 1432-1017
    Keywords: Electric field ; Magnetic field ; Suspended particle ; Magnetic sensitivity ; Organism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract We observed that particles, suspended in an electrolyte and brought into crossed magnetic and electric fields of low intensities, will deviate in the central part of the electrophoresis chamber of a standard Zeiss Cytopherometer with a component vertical to both fields. The direction and magnitude, however, were sharply at variance with what would be expected by the action of the Lorentz force (EMF) on the surface of the particles. The magnitude of the deviation depends upon the magnetic and electric field strength, the ion concentration of the suspension medium and the geometry of the chamber. The movement of the particles is due to streaming of the electrolyte which is mainly caused by inhomogeneities of the electric field in the electrophoresis chamber. The magnitude of the effect is high enough to occur under physiological conditions. Magneto-electrophoretic streaming might eventually act as a transducer mechanism which could explain the ability of some animals to orientate themselves in the geomagnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00538842
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Flow-cytometric measurements of the transmembrane potential, the surface charge density and the phagocytic activity of guinea pig macrophages after incubation with lymphokines (1981)
    Springer
    Annals of hematology 42 (1981), S. 379-382 
    Details
    ISSN: 1432-0584
    Keywords: Macrophage ; Lymphokine ; Transmembrane potential ; Phagocytosis ; Electrophoretic mobility ; Flow cytometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effects of lymphokines on guinea pig peritoneal macrophages were measured via flow cytometry utilizing the three-parameter FLUVO-METRICELL flow cytometer. On the basis of cell volume three distinct macrophage populations could be distinguished. Three to 5 min after starting the incubation with lymphokines a hyperpolarization of all three macrophage populations took place which was followed by depolarization. After 60 min the transmembrane potential reached again its control values. The negative charge density of the cell membrane decreased shortly after beginning of the incubation to 70-80% of the initial value and then remained unchanged for the following 120 min. The phagocytic activity of the macrophages was diminished during the depolarisation phase but increased over control values after restoration of the transmembrane potential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00996900
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Postnatale Entwicklung von Rattenthrombozyten: Die Volumenverteilung und elektrophoretische Beweglichkeit von Rattenthrombozyten während des ersten Lebensmonats (1980)
    Springer
    Annals of hematology 40 (1980), S. 421-428 
    Details
    ISSN: 1432-0584
    Keywords: Rat ; Thrombocytes ; Cell volume ; Electrophoretic mobility ; Haematopoiesis ; Ratten ; Thrombozyten ; Zellvolumen ; elektrophoretische ; Beweglichkeit ; Hämatopoese
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Volumenverteilung von Rattenthrombozyten zeigt zwischen dem 5. und dem 8. Tag nach Geburt eine deutliche Zunahme im Modalvolumen. Bei rechnerischer Analyse der Kurven konnten keine deutlichen Anhaltspunkte für zwei diskrete Thrombozytenpopulationen gefunden werden. Da sich jedoch der Anstieg des Modalvolumens mit dem Beginn der Produktion einer neuen Erythrozytenpopulation deckt, und außerdem die Thrombozytenkonzentration im Blut in dieser Zeit deutlich ansteigt, können diese Veränderungen Ausdruck der Produktion einer zweiten Thrombozytenpopulation sein. Die mittlere elektrophoretische Beweglichkeit der Rattenthrombozyten fällt in den ersten drei Wochen nach Geburt nur geringfügig ab, während die der Erythrozyten im gleichen Zeitraum signifikant anstiegt.
    Notes: Summary The volume distribution curves of rat thrombocytes show a significant rise of the modal volume between days 5 and 8 after birth. No clear evidence for two distinct thrombocyte populations was obtained by computer analysis of the volume distribution curves. However, the increase of the modal volume of the platelets correlates with the production of a new erythrocyte population. In addition, the platelet concentration in the blood increases significantly during this time. These changes could indicate the production of a second thrombocyte population. The mean electrophoretic mobility of rat thrombocytes decreases only slightly during the first 3 weeks after birth, while it increases for erythrocytes significantly during the same period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01029684
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    Paper (German National Licenses)
    Fulltext
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