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  • 21
    Electronic Resource
    Electronic Resource
    Grundlagen der operativen Anwendung tiefer Temperaturen in der klinischen Medizin (1967)
    Springer
    Clinical and experimental medicine 144 (1967), S. 46-53 
    Details
    ISSN: 1591-9528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The effect of deep temperature applied by Cooper's instrument on the brain of rabbits has been investigated. In 190 tests the influence of reduced blood circulation by ligation of the Aa. carotis and vertebralis on form and sice of ice-balls in the brain has been examined. Deviation from the spherical form of the phenomenon mentioned above was more rarely observed than was expected. The most frequent variations were of an elliptical or flattened manner. It is assumed that a near blood vessel may influence the form of glaciation. Blood supply seems to be most essential for the degree of glaciation. Normal blood flow diminished the size of the iced solid in the brain whereas insufficient bloodsupply or no blood-supply at all caused an extension of it. The blood pressure of 33 rabbits has been raised by injection of adrenalin and noradrenalin. The size of intra-cerebral iceballs by standardiced cooling was significantly reduced by adrenalin, whereas nor-adrenalin did not change it. The reduction of the frozen area is not immediately correlated with the increased blood pressure but with the increased vascularisation.
    Notes: Zusammenfassung An 55 Hirnen lebender Kaninchen wurden in 190 Einzelversuchen Eiskörper mittels des Cooperschen Kälteaggregates gesetzt. Vorher wurden ein- und doppelseitige Ligaturen der Aa. carotides communes und Aa. vertebrales in wechselnden Kombinationen vorgenommen. Die Eiskörpergrößen bei verschiedenen Temperaturen und Vereisungszeiten wurden bei normaler und durch die Ligaturen geminderter Zirkulation gemessen und miteinander verglichen. Die Eiskörper waren nach Ligatur der Hirngefäße in dem versorgten Hirngebiet konstant größer als bei ungehinderter Zirkulation. In 80% der Versuche zeigten sie Kugelform, in 20% ellipsoide oder abgeplattete Formen. An weiteren 33 Kaninchen wurde durch Noradrenalin- und Adrenalingaben der Blutdruck gesteigert. Es ergab sich keine Beeinträchtigung des Durchmessers im Standardverfahren gesetzter intracerebraler Eiskörper durch Noradrenalin, während bei Blutdrucksteigerung nach Adrenalingabe die Kälteeffekte, gemessen an der Größe der Eiskörper im Hirngewebe, reproduzierbar gemindert waren. Diese Wirkung wird auf eine mit dem Blutdruckanstieg verbundene Durchblutungssteigerung des Gehirns zurückgeführt. Bei konstanten Abkühlungsbedingungen kann die Eiskörpergröße als ein Durchblutungsmaß angesehen werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02043605
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  • 22
    Electronic Resource
    Electronic Resource
    Single-pore sensilla of damselfly-larvae: Representatives of phylogenetically old contact chemoreceptors? (1980)
    Springer
    Cell & tissue research 207 (1980), S. 307-320 
    Details
    ISSN: 1432-0878
    Keywords: Insect sensilla ; Fine structure ; Odonata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Die vier Porensensillen des Maxillarpalpus von Agrion and Ischnura besitzen zwei (Sensillum Typ A), beziehungsweise fünf (Sensillum Typ B) bipolare Rezeptorzellen. Distal werden ihre Dendriten von der Dendritenscheide und dem Porusrohr umschlossen. Die Dendriteninnenglieder inserieren seitlich an den Perikarya. Die Rezeptorzellen jedes Sensillums sind von drei Hüllzellen und drei voneinander getrennten Rezeptorlymphräumen umschlossen. Rezeptorlymphraum l und 3 haben durch das Porusrohr, beziehungsweise durch das Porenkanalsystem der Cuticula Verbindung nach außen. Alle drei Hüllzellen zeigen apikal mikrovillusartige Membranstrukturen; außerdem besitzen sie je zwei Centriolen in Tandemstellung. Die Feinstruktur der Porensensillen wird mit der ähnlicher Arthropodensensillen verglichen. Funktionelle und phylogenetische Aspekte werden diskutiert.
    Notes: Summary The four single-pore sensilla on the maxillary palp of Agrion and Ischnura possess two bipolar sensory cells for A-sensilla and five for B-sensilla. Distally, their dendrites are enclosed by a dendritic sheath and a pore tube. The dendritic tips have access to the outside via the opening of the pore tube. The inner dendritic segments join the receptor cell bodies laterally. The receptor cells of each sensillum are enveloped by three sheath cells and three receptor lymph cavities. Receptor lymph cavity 1 and 3 are connected with the outside by the pore tube and a minute canal system in the cuticle, respectively. All three sheath cells show microvilluslike processes of the apical membrane. Moreover, all sheath cells contain two centrioles in tandem arrangement. The structure of the single-pore sensilla is compared with that of similar sensilla of other arthropods. Functional and phylogenetic aspects are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00237814
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  • 23
    Electronic Resource
    Electronic Resource
    Statistics of extreme values applied to the brittle fracture of poly(methyl methacrylate) containing polytetrafluoroethylene particles (1969)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 7 (1969), S. 1863-1882 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Poly(methyl methacrylate) tensile bars were prepared containing nearly spherical polytetrafluoroethylene particles in concentrations from one to a thousand particles per gauge length of the bars. Particle diameters varied from 0.0035 to 0.018 in. Exhaustive tensile tests were performed at sufficiently high strain rate to assure brittle fracture and the results analyzed statistically by the theory of extreme values as proposed by Epstein. The results suggested that the polytetrafluoroethylene particles themselves did not act as flaws, but that they intensified the stress field on natural flaws which acted as the origin of fracture. Assuming a Laplace distribution as the underlying distribution of tensile strength (not to be confused with observed distribution of tensile strengths) gave predicted fracture statistics in good agreement with experiment.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1969.160071103
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    Paper (German National Licenses)
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  • 24
    Electronic Resource
    Electronic Resource
    Resonance Raman spectrum of the transient dimethylsulfide dimer radical cation |(CH3)2S|2+· (1981)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 11 (1981), S. 24-26 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The resonance Raman spectrum of the transient thioether radical cation dimer complex |(CH3)2S|2+·, generated by electron irradiation of an aqueous solution of dimethylsulfide and recorded by optical multichannel detection, is reported. Vibrational bands at 276 cm-1 and 139 cm-1 were detected and are assigned to the stretching mode of the quasi-three-electron S—S bond and a δ(CSS) deformation mode, respectively.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250110108
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    Paper (German National Licenses)
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