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  • 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
    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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