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  • 1
    Digitale Medien
    Digitale Medien
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 1248-1252 
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The numerical continuation and bifurcation methods of Keller [H. B. Keller, in Applications of Bifurcation Theory (Academic, New York, 1977), pp. 359–384] are used to study the variation of some branches of axisymmetric Taylor vortex flow as the wavelength in the axial direction changes. Closed "loops'' of solutions and secondary bifurcations are determined. Variations with respect to Reynolds number show the same phenomena. The results presented here show that Taylor vortices with periodic boundary conditions exist in a wider range of wavelengths, λ, than observed in the Burkhalter/Koschmieder experiments [Phys. Fluids 17, 1929 (1974)]. They also show that there is possibly a λ subinterval within the neutral curve of Couette flow such that there are no Taylor vortex flows with smallest period in this interval.
    Materialart: Digitale Medien
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    World journal of surgery 10 (1986), S. 53-63 
    ISSN: 1432-2323
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Résumé La dénutrition représente un facteur de risque important chez les malades qui doivent subir une intervention gastro-intestinale majeure. En 7–10 jours, une alimentation parentérale préopératoire est susceptible d'améliorer l'état nutritif de la majorité des sujets dénutris. La concentration de divers facteurs protéiques et l'immunocompétence augmentent de manière significative. Les conséquences de l'alimentation parentérale préopératoire ont été étudiées avec précision seulement lors de quelques essais comparatifs. Les résultats de ces études n'ont pas toujours été identiques. Cependant, on peut dire que lorsque le taux des complications postopératoires était élevé il s'est trouvé réduit. L'amélioration de la technique chirurgicale limite cependant la valeur de ce fait. En réalité, on peut considérer que l'alimentation parentérale restera indiquée jusqu'à ce que le taux des complications opératoires devienne nul, en particulier lorsque le malade est traité pour un cancer de la partie supérieure du tube digestif par une intervention majeure.
    Kurzfassung: Resumen La malnutrición puede ser un importante factor de riesgo, especialmente en pacientes sometidos a cirugía gastrointestinal mayor. Mediante la provisión de siete a diez días de nutrición parenteral preoperatoria adecuada, hemos sido capaces de mejorar el estado nutricional de la mayoría de los pacientes. Las concentraciones de los diversos parámetros de los compartimientos proteicos y de la inmunocompetencia aparecen significativamente incrementadas. El efecto de la nutrición parenteral preoperatoria sobre el resultado postoperatorio ha sido estudiado sólo en unos pocos ensayos clínicos debidamente diseñados: los resultados no han sido unánimes. Sólo si la tasa de complicaciones postoperatorias ha sido alta, la nutrición parenteral preoperatoria aparece disminuyéndola en forma significativa. Las mejores técnicas quirúrgicas han venido a limitar el valor de la nutrición parenteral preoperatoria. Pero mientras la tasa de complicaciones postoperatorias no llegue a 0, la nutrición parenteral preoperatoria tendrá significación, especialmente en pacientes con cáncer del tracto gastrointestinal alto, para quienes se planea una operación mayor.
    Notizen: Abstract Malnutrition can be an important risk factor, especially in patients undergoing major gastrointestinal surgery. With 7–10 days of adequate preoperative parenteral nutrition, we are able to improve the nutritional status of most patients. Concentrations of several parameters of the protein compartment and immunocompetence increase significantly. The effect of preoperative parenteral nutrition on postoperative outcome has been tested in only a few properly designed comparative trials. The results were not unanimous. If the postoperative complication rate was high, preoperative parenteral nutrition significantly reduced it. Improvement in surgical technique limited the value of preoperative parenteral nutrition. However, as long as the postoperative complication rate is not zero, preoperative parenteral nutrition is indicated, especially in patients with cancer of the upper gastrointestinal tract, when a major operation is planned.
    Materialart: Digitale Medien
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 334 (1986), S. 346-351 
    ISSN: 1432-1912
    Schlagwort(e): Nerve growth factor (NGF) ; Rat basal forebrain ; Cholinergic neurons ; Monoaminergic neurons ; Denervation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary We have investigated whether degeneration of basal forebrain cholinergic neurons is a potential trigger for increased NGF production in the adult rat brain. Electrolytic lesions of cholinergic neurons in the septum-diagonal band and in the nucleus basalis of Meynert induced a transient increase in NGF in the ventral hippocampus (+70%) and cerebral cortex (+125%), respectively. In contrast, selective aminergic denervation of the forebrain by electrolytic lesion of the medial forebrain bundle, did not increase NGF levels in hippocampus and cerebral cortex. Thus, a cholinergic mechanism appears to regulate NGF production in adult rat basal forebrain.
    Materialart: Digitale Medien
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 335 (1987), S. 12-20 
    ISSN: 1432-1912
    Schlagwort(e): MAO-A ; MAO-13 ; Short-acting MAO inhibitors ; In vitro reversibility ; Rat brain and liver
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary The inhibition of monoamine oxidase (MAO) in rat liver and brain by the short-acting MAO-A inhibitors moclobemide (Ro 11-1163 = p-chloro-N-[2-morpholinoethyl]benzamide) and brofaremine and by the short-acting MAO-13 inhibitors Ro 16-6491 (N-[2-aminoethyl]-p-chlorobenzamide) and almoxatone, administered p. o. at roughly equieffective doses 2 h before decapitation, was investigated for its reversibility under various in vitro conditions. MAO A activity in liver homogenates, inhibited by moclobemide (300 μmol/kg) to approx. 15% of control, time dependently recovered during 0.5 to 2 h of incubation at 37°C, irrespective of whether the homogenates were prepared and incubated in distilled water or Krebs-Ringer buffer (KRB). Dialysis of such homogenates for 4 h in distilled water at 37°C (but not at 13°C) led to a complete return of the MAO activity. In liver homogenates from rats pretreated with brofaremine (30 μmol/kg), dialysis for 4 h at 37°C against distilled water caused only little recovery of the MAO activity. Likewise, MAO-B inhibited by Ro 16–6491 (30 μmol/kg) to approx. 4% of control returned to almost control activity after 4 h of dialysis at 37°C, while inhibition induced by almoxatone (30 μmol/kg) was little or not reversed at all. In brain homogenates prepared in, and dialysed against, distilled water or KRB at 37°C (but not at 13°C), MAO-A inhibited by moclobemide (100–300 μmol/kg) to approx. 15% of control, partially (KRB) or almost completely (dist. water) returned to control activity after 4 h of dialysis. From rats pretreated with Ro 16–6491 (30 μmol/kg), MAO-B in brain homogenates prepared in KRB was reduced to 12% of control and returned to control value upon dialysis for 4 h in KRB at 37°C; in homogenates prepared in H2O, MAO-B was reduced to only 60% of control and completely recovered by dialysis against dest. water even at 13°C. In all of these conditions, recovery of the enzyme activity was small after brofaremine and almoxatone. Analogous results were obtained with brain slices (0.2 × 0.2 × 1.5 mm) in KRB at 37°C, whereby time dependent recovery of MAO activity during incubation was achieved, and superfusion was somewhat more effective than incubation in restoring enzyme activity. In the experiments with incubated or superfused brain slices, inhibition of MAO-A and -B by the irreversible inhibitors clorgyline and selegiline (l-deprenyl), resp., could not be reversed at all. Tyramine (0.3 mmol/l) clearly enhanced the recovery of MAO-A in KRB-prepared liver homogenates and brain slices of moclobemide-pretreated rats but not in brain slices of brofaremine- and clorgyline-pretreated rats. Thus, the reversibility of MAO inhibition in vitro could be convincingly demonstrated for moclobemide and Ro 16–6491 but not for the other novel, short-acting MAO inhibitors studied.
    Materialart: Digitale Medien
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  • 5
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The first scientific objective of the HMC is to discover and observe the comet nucleus and to attempt to verify its solid nature and the general concept of the icy conglomerate model of cometary nuclei, as proposed by Whipple1 about 36 years ago. This objective involves the determination of the ...
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 333 (1988), S. 146-148 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Figure 1 a, c, and d shows one high-resolution image of comet Halley taken at the South African Astrophysical Observatory (SAAO)2 and two images taken at the Anglo-Australian Observatory (AAO)3. All images have been reduced and calibrated, and are part of the HMC database. The scales are 390 and ...
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 331 (1988), S. 227-231 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Images taken by the Halley Multicolour Camera on board the ESA spacecraft Giotto during its fly-by of comet Halley in March 1986 have been improved by careful calibration and image processing methods. Surface features a few hundred metres in dimension are now visible. Several surface structures are ...
    Materialart: Digitale Medien
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  • 8
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 332 (1988), S. 51-52 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Halley Multicolour Camera (HMC) images of comet Halley show jet-like features and filaments which, in some cases, can be traced to the surface of the nucleus. The dust column density at large distances clearly exhibits I/R dependence2, as can also be demonstrated by plotting intensity / multiplied ...
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 115-117 
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 41 (1985), S. 16-20 
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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