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  • 1975-1979  (3)
  • 42.55D  (1)
  • Microstimulation  (1)
  • Pineal gland  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Negative ion effects in CO2 convection laser discharges (1978)
    Springer
    Applied physics 16 (1978), S. 111-118 
    Details
    ISSN: 1432-0630
    Keywords: 42.55D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Negative ions are computed to be formed on a time scale and in quantities such that they may be a cause of plasma instability observed in low pressure electrical discharge convection CO2 lasers. In a typical CO2−N2−He−H2O laser mixture the principal ions are CO 3 − , CO 4 − and H− with the total negative ion densityn − given by 0.1n e 〈n −〈n e , wheren e is the electron density: but if the gases are re-cycled or if there is an air leak NO 2 − and NO 3 − are formed in significant amounts andn − can become greater thann e in a time considerably less than the gas dwell time in the electrical excitation discharge. CO is effective in reducingn − in a system without re-cycling, but is ineffective in a re-cycled system with the oxides of nitrogen present.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00931431
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Relation of activity in precentral cortical neurons to force and rate of force change during isometric contractions of finger muscles (1975)
    Springer
    Experimental brain research 23 (1975), S. 315-332 
    Details
    ISSN: 1432-1106
    Keywords: Precentral motor cortex ; Unit recording ; Isometric precision grip ; Force and rate of force change ; Microstimulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The activity of single neurons within the hand area of the precentral motor cortex of primates was recorded during the performance of a maintained precision grip between the thumb and forefinger. The finger opposition forces were exerted against a strain gauge which allowed force changes to be studied under near isometric conditions. Task performance required the generation of a force ramp (the dynamic phase) and thereafter the maintenance of a stable force for one second (the static phase). Intracortical stimulation through the recording electrode was used to verify that the recordings were made from the appropriate somatotopographic area of the motor cortex. From a total of 221 recorded neurons, 76 were found to be either activated or deactivated during performance of the task. Among the 51 activated neurons, most discharged at higher frequencies during the dynamic phase, than during the static phase. The discharge of some of these neurons could be related to both force (F) and rate of force change (df/dt) whereas certain others could only be correlated with df/dt. The change in discharge frequency for these neurons generally occurred prior to the onset of EMG activity. Eight neurons were more active during maintained force than during the force ramp. The discharge frequency could not be correlated with df/dt and only one showed a significant positive relation to force. The change in discharge frequency for these neurons either coincided or occurred after the onset of EMG activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00239743
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The pineal gland of the mole (Talpa europaea L.) (1976)
    Springer
    Cell & tissue research 165 (1976), S. 297-306 
    Details
    ISSN: 1432-0878
    Keywords: Pineal gland ; Mole ; Yellow-orange autofluorescent material ; Subcommissural organ
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé Une étude de la glande pinéale de la Taupe, animal vivant toujours dans une obscurité complète, a été entreprise selon la technique de fluorescence décrite par Falck et al. (1962). Une importante innervation catécholaminergique a été démontrée tandis que la fluorescence jaune — caractéristique des indoleamines-n'a pas été observée. Après omission du traitement par la formaldehyde, de très nombreuses cellules contenant du material autofluorescent (jaune-orange) furent observées. La nature et la fonction de ce material autofluorescent est discutée.
    Notes: Summary The pineal gland of the mole, a mammal which lives in permanent darkness, has been studied using fluorescence histochemistry. An extensive catecholaminergic innervation is demonstrated. A yellow formaldehyde-induced fluorescence, characteristic of indoleamines, was not observed. If formaldehyde vapour treatment was omitted in the procedure, numerous cells containing yellow-orange autofluorescent material could be shown. The nature and possible function of this material is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222434
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    Paper (German National Licenses)
    Fulltext
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