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  • 1
    Electronic Resource
    Electronic Resource
    An analysis of the spatial mechanisms responsible for electrosensitivity in rays-modelling results (1986)
    Springer
    Biological cybernetics 54 (1986), S. 263-268 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract Mathematical methods have helped to reveal the possible mechanisms of information conversion processes by the Lorenzinian ampullae during spatial detection of the dipole electric field. A stationary voltage distribution in the inhomogeneous media has been calculated by means of numerical methods. The skate body has been represented by a thin disk. If the dipole axis was positioned in the disk plane, potential distortions near the disk were negligibly small. In other cases the electrical field energy absorbed by ampullary groups has been dramatically reduced. It was supposed that body tissues served as the space filter of the electroreceptive system. Based on the result presented here, a new mechanism of the electrolocation was proposed. The ampullary groups were predicted to play the role of arrays which were able to perceive spatial characteristics of the external electric field. The theoretical analysis of ampullary groups circular sensitivity diagrams supported the prediction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318422
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  • 2
    Electronic Resource
    Electronic Resource
    The vacuum ultraviolet spectrum of krypton and xenon excimers excited in a cooled dc discharge (1998)
    Springer
    Applied physics 66 (1998), S. 81-90 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 3690
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: u , 0u + and the weakly bound ground state 0g +. A semiempirical method was suggested and applied to describe the experimental spectra and to estimate the temperature of the radiating plasma volume. Electron impact, transferring dimers from the ground state to the excited states, is shown to be an efficient excitation mechanism in the 100–850 hPa and the 10–50 mA pressure and discharge current ranges. The spectra obtained as well as the results of calculations corroborate the high rate of this mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050359
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  • 3
    Electronic Resource
    Electronic Resource
    Failure of titanium alloy TS5 with a gas-saturated surface layer (1977)
    Springer
    Strength of materials 9 (1977), S. 1215-1217 
    Details
    ISSN: 1573-9325
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01528912
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  • 4
    Electronic Resource
    Electronic Resource
    Power supply for repetitively pulsed lasers (1979)
    Springer
    Journal of applied spectroscopy 30 (1979), S. 124-126 
    Details
    ISSN: 1573-8647
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00612783
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Spectral instrument for absorption investigations in the vacuum ultraviolet (1973)
    Springer
    Journal of applied spectroscopy 19 (1973), S. 1671-1673 
    Details
    ISSN: 1573-8647
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00611088
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  • 6
    Electronic Resource
    Electronic Resource
    Morphine decreases the voltage sensitivity of slow sodium channels (2000)
    Springer
    Neuroscience and behavioral physiology 30 (2000), S. 431-439 
    Details
    ISSN: 1573-899X
    Keywords: Spinal ganglion neurons ; TTXr sodium channels ; Na+,K+-ATPase ; opioid receptors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Cell membrane recordings were made in conditions of voltage clamping with tight attachment of the microelectrode—patch clamping— to study the effects of morphine on tetrodotoxin-resistant (TTXr) sodium channels in rat spinal ganglion neurons in culture. The effects of a number of biologically active substances which regulate the receptor-mediated actions of morphine were studied. The effects of morphine were found to involve a chain of sequential reactions leading to decreases in the transfer of effective charge (Zeff) by the activatory gate system of TTXr sodium channels, depending on the concentration of agonist in the extracellular solution. A value of 8 nM was obtained forK D , with a Hill coefficient of X=0.5. Non-specific antagonists of opioid receptors blocked the actions of morphine; these included ouabain at a concentration of 100 μM. An inhibitor, and activator, and a blocker of G-proteins had no effect on the effective charge. These data provide evidence that morphine decreases the voltage sensitivity of TTXr sodium channels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02463098
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  • 7
    Electronic Resource
    Electronic Resource
    Model of adaptation of the nerve fiber ranvier node membrane to the action of a steady current as the result of sodium channel inactivation (1983)
    Springer
    Neurophysiology 15 (1983), S. 390-394 
    Details
    ISSN: 1573-9007
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effect of the second-order kinetics of the sodium channel inactivation system on spike activity was studied on a modified Hodgkin-Huxley model of the amphibian Ranvier node (Dodge model). The results of calculations based on the experimental data of Chiu, Kniffki, et al. suggest that the cause of adaptation of the amphibian nerve fiber membrane may be the second-order kinetics of the sodium channel inactivation system. Unlike the potassium mechanism of adaptation, the sodium mechanism is associated with constancy or a progressive decline of response amplitudes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01066757
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  • 8
    Electronic Resource
    Electronic Resource
    Role of the body in primary signal processing by the electroreceptor system of the skate (1985)
    Springer
    Neurophysiology 17 (1985), S. 478-482 
    Details
    ISSN: 1573-9007
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Using a mathematical modeling technique, possible spatial mechanisms of processing information by the ampullae of Lorenzini were investigated in the skate during detection of the dipole electric field corresponding in the first approximation to the bioelectric fields of marine vertebrates and invertebrates. Stationary voltage distribution in the inhomogeneous environment was calculated numerically. An unlimited volume of seawater was used as the environment into which a slim disk was placed simulating the body of the fish, which served to create inhomogeneity. When the dipole axis was on the same plane as the disk, distortion in the voltage distribution was negligible. On occasions when the dipole was perpendicular to the plane of the disk, the electrical field energy absorbed by ampullary groups decreased significantly. Calculations suggested that by reorienting its body the fish is able to phase out signals coming from dipoles with their axes on different planes from that of the skate's body.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01052185
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  • 9
    Electronic Resource
    Electronic Resource
    Inactivation kinetics of sensory neuron sodium channels depend on the type of hydrogen ion buffer (1998)
    Springer
    Neuroscience and behavioral physiology 28 (1998), S. 65-71 
    Details
    ISSN: 1573-899X
    Keywords: Sodium channel ; patch-clamp method ; inactivation of sodium conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Tetrodotoxin-sensitive and tetrodotoxin-resistant sodium currents were studied in rat dorsal root ganglion neurons using a patch-clamp method. The type of hydrogen ion buffer used was found to affect the kinetics of the inactivation process. Tris ions irreversibly bound to the inactivation gating apparatus, accelerating the decay in the trailing front of the ion current. The characteristics of this process were clearly nonlinear in this buffer. In HEPES buffer, the inactivation dynamics were slowed for both types of channel studied. Unlike results obtained with tris buffer, there were no sharp changes in the characteristics as compared to those obtained immediately after puncture of the cell membrane. The advantages of using HEPES buffer for studies of the inactivation gating processes of sodium channels are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02461914
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  • 10
    Electronic Resource
    Electronic Resource
    Responses of the ampullae of Lorenzini in a uniform electric field (1979)
    Springer
    Neurophysiology 11 (1979), S. 118-124 
    Details
    ISSN: 1573-9007
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A linear relationship was established by analysis of discharges from electroreceptors of the ampullae of Lorenzini in a uniform electric field between the potential difference on a single ampulla and the relative change in the spike response of a single fiber. This relationship can serve as the basis for a model of activity of ampullary groups considered as functional units of the electroreceptor system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01064519
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