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  • 21.60.−n  (1)
  • Chemistry  (1)
  • Device implantation  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 353 (1995), S. 239-245 
    ISSN: 1434-601X
    Keywords: 21.10.−k ; 21.60.−n ; 25.70.−z ; 27.60.+j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High spin states of119Te, populated in110Pd(13C, 4n) and110Pd(12C, 3n) reactions, have been studied throughγ-ray spectroscopy. The level scheme has been established up to jπ=(55/2−). Three-quasiparticle states, based onπg 7 2/2 ⊗vh 11/2 andπg 7/2 d 5/2⊗vh 11/2 configurations, have been identified. A particularly favoured 39/2− state is suggested to be the fully aligned [πg 7 2/2 ]6+⊗[vh 11 2/3 ]27/2− yrast non-collective oblate configuration. This assignment is supported by Total Routhian Surface (TRS) calculations which also suggest a similar oblate assignment to states at 21/2−, 23/2− and 37/2−.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Medical & biological engineering & computing 14 (1976), S. 15-18 
    ISSN: 1741-0444
    Keywords: Contraception ; Device implantation ; Reversibility ; Scrotum ; Vasectomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Sommaire On a proposé une nouvelle façon d'aborder le blocage réversible du passage des spermatozoïdes dans le canal déférent. La technique est basée sur l'implantation d'un appareil ressemblant à un robinet qui permet le mouvement mécanique vers les positions ouvert et fermé. A partir d'essais expérimentaux, on a identifié les aspects critiques des matériaux, de leur fixation et de leur forme. Les résultats montrent qu'un passage des spermatozoïdes de taille minimum ainsi qu'un trajet de transport rectiligne des spermatozoïdes, sont essentiels. Le succès de l'opération dépend, de façon cruciale, de la stabilisation correcte de l'appareil. On a utilisé une méthode faisant usage d'espaces crés artificiellement sur les tuyaux en acier inoxydable et menant à des croissances internes de tissus. Des essais sur des rhésus pendant une période d'environ quinze mois, confirment la plausibilité de cette méthode. L'article présente des améliorations de construction mécanique nécessaires pour le rendre utilisable pour la contraception chez les humains.
    Abstract: Zusammenfassung Es wurde eine neue Lösung zur Rückbildung einer Blockierung für den Durchfluß von Spermatozoen in der vas deferens vorgeschlagen. Das Verfahren beruht auf der Einpflanzung einer hahnartigen Vorrichtung, durch die eine mechanische Einstellung auf geöffnete und geschlossene Stellung möglich ist. Aufrund von experimentellen Versuchen wurden die kritischen Aspekte von Werkstoffen, Befestigung und Form festgelegt. Die Ergebnisse zeigen, daß eine Mindestgröße für den Durchlaß der Spermatozoen und ein gerader Weg für den Spermatozoentransport wesentlich sind. Für einen erfolgreichen Einsatz ist die richtige Stabilisierung der Vorrichtung bedeutend. Es wurde ein Verfahren verwendet, bei dem die künstlich geschaffenen Räume in den Edelstahlröhren zum Einwachsen in das Gewebe führen. Versuche an Rhesusaffen für die Dauer von etwa fünfzehn Monaten bestätigen die Durchführbarkeit dieser Lösung. Es werden die Verbesserungen dargestellt, die in der mechanischen Konstruktion erforderlich sind, wenn diese Möglichkeit zur Schwanger-schaftsverhütung beim Menschen praktisch zum Einsatz gelangen soll.
    Notes: Abstract A new approach to the reversible blockage of the passage of spermatozoa in the vas deferens has been proposed. The technique is based on the implantation of a tap-like device which allows mechanical movement to the open and closed positions. On the basis of experimental trials the critical aspects of materials, fixation and form were identified. The results show that a minimum size of the spermatozoa flow path and a straight path for spermatozoa transport are essential. Proper stabilisation of the device is crucial to successful operation. A method using artificially created spaces on the stainless steel tubes leading to tissue ingrowth was used. Trials on rhesus monkeys over a period of about fifteen months confirm the feasibility of the approach. Improvements in the mechanical design required for practical use as a contraceptive technique in humans are presented.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 4 (1990), S. 345-352 
    ISSN: 0268-2605
    Keywords: Organolead(IV) ; N-protected aminoacids ; dipeptides ; structures ; complexes ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The diphenyllead(IV) derivatives of N-benzoyl-(glycine, DL-alanine); N-formyl and N-acetyl-L-phenylalanine; N-monochloroacetyl-L-phenylalanine; N-benzoyl-(glycylglycine, DL-alanylglycine), and N-formyl- N-acetyl- and N-monochloroacetyl-(L-phenylalanylglycine) have been prepared in 1:2 molar ratio by reaction of diphenyllead dichloride with the appropriate amino-acid or dipeptide. Corresponding triphenyllead(IV) derivatives have been prepared in 1:1 molar ratio by reaction of triphenyllead chloride with the thallium(I) salts of the amino-acid or the dipeptide. These complexes have been characterized by elemental analysis, IR and 1H NMR spectral studies. A polymeric hexacoordinated octahedral structure for diphenyllead(IV), and a five-coordinated distorted trigonalbipyramidal chain-type structure for triphenyllead(IV), complexes is confirmed by IR spectra. The carboxylate group acts in a bidentate manner, not as in diorgano and triorganotin(IV) complexes with these acids, where it is monodentate. The available bonding sites such as amide and peptide carbonyl (CO) and amide and peptide nitrogen atoms are not involved in bonding with lead (IV) and thus are available for bonding with the biological systems. The presence of different N-protecting groups does not affect the coordination sites around lead(IV). The triphenyllead(IV) compounds are relatively more stable than the diphenyllead(IV) compounds.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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