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  • infrared  (2)
  • Ranvierscher Schnürring  (1)
  • Stationary Current-Voltage Relation  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Messung des Calcium-Einflusses auf die Strom-Spannungsbeziehung der erregbaren Membran am Ranvier-Knoten (1968)
    Springer
    Pflügers Archiv 300 (1968), S. 23-34 
    Details
    ISSN: 1432-2013
    Keywords: Electro-Physiology ; Ranvier-Node ; Stationary Current-Voltage Relation ; Calcium ; Elektrophysiologie ; Ranvierscher Schnürring ; Stationäre Strom-Spannungscharakteristik ; Calcium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Erhöht man die extracelluläre Calcium-Konzentration, so verschieben sich die Stromextrema der Strom-Spannungsbeziehung des Ranvier-Knotens nach Depolarisationsrichtung. Mit Hilfe einer Gleichung zur Darstellung der Kennlinien läßt sich diese Wirkung durch Änderung eines einzigen Parameters V Tγ beschreiben. Dieser gibt die Spannungslage des Abfalles einer Stufenfunktion wieder, die im Rahmen der Ionentheorie der Kaliumleitfähigkeitsvariablen n ∞ 4 (V) entspricht. Durch Erhöhung von [Ca··] a wird V Tγ nach Depolarisationsrichtung verschoben. Darüber hinaus konnte eine deutliche Abhängigkeit dieses Parameters von [K·] a festgestellt werden. Der Calcium-Einfluß auf das Membranpotential konnte als Konsequenz der Vt r −-Verschiebung interpretiert werden.
    Notes: Summary An increase of the extracellular calcium-concentration shifts the extreme current values of the current-voltage-relation of a Ranvier-node towards depolarization. This influence can be described by the change of one single parameter V Tγ of an equation representing the current-voltage-characteristic. V Tγ referres to the potential at which the s-shaped step-function of resistance change assumes the arithmetical mean of its limiting values. The step-function compares to the variable of potassium conductance n ∞ 4 (V). An increase of [Ca··] a shifts V Tγ towards depolarizing potentials. V Tγ is also found to depend on [K·] a . The influence of calcium on membrane potential is interpreted as a consequence of the observed shift of V Tγ .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00380845
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Changes of cell behavior by near-infrared signals (1995)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 32 (1995), S. 299-304 
    Details
    ISSN: 0886-1544
    Keywords: 3T3 cells ; CV1 cells ; cell motility ; infrared ; photobiology ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: 3T3 mouse fibroblasts responded differently to specific near-infered signals than epithelial CV1 cell. Furthermore, signals with the same wavelength and energy changed the percentages of attracted and repelled 3T3 cells if their intensity modulation was altered. I found this result in a 22 month long study which established a spectrum of motile responses of 781 individual 3T3 cells and 148 CV1 cells to the near-infrared emissions of microscopic, pulsating light sources using the infrared spot-irradiation phase-contrast (IRSIP) microscopic [Albrecht-Buehler, 1991: J. Cell Biol. 114:493-502]. Thus the response of cultured, mammalian cells to near-infrared light signals is not merely a matter of total energy absorption by cirtain cytoplasmic componets. Since it seems to depend on the cell type and the temporal pattern in which the light energy is emitted, it appears to imply the existence of a new kind of cellular information. © 1995 Wiley-Liss, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cm.970320406
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  • 3
    Electronic Resource
    Electronic Resource
    Cellular infrared detector appears to be contained in the centrosome (1994)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 27 (1994), S. 262-271 
    Details
    ISSN: 0886-1544
    Keywords: 3T3 cells ; cell motility ; infrared ; phototaxis ; centrosome ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Previous experiments have suggested that 3T3 cells were able to extend pseudopodia toward latex particles up to 60 μm away from the cell body if the particles were irradiated by an infrared beam in the range of 700-900 nm [Albrecht-Buehler, 1991: J. Cell Biol. 114:493-502]. The present article reports that this response of cells to infrared light can be inhibited if the cell center is simultaneously irradiated with a beam of the same light. In marked contrast, the cells responded normally to the presence of infrared light scattering particles if the second beam irradiated other parts of the cell body. The results imply that the cellular mechanism of infrared detection is located at the cell center. The infrared sensing mechanism remains intact in enucleated cells and in cells which were incubated in monensin to vesiculate their Golgi apparatus and inhibit their Golgi functions. Accordingly, it is proposed that the centrosome which contains the centrioles is the only remaining candidate in the cell center for a cellular detection device for the direction of infrared signal sources. The results support an earlier suggestion that centrioles may be such detection devices [Albrecht-Buehler, 1981: Cell Motil. Cytoskeleton 1:237-245]. © 1994 Wiley-Liss, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cm.970270307
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    Paper (German National Licenses)
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