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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Diabetologia 8 (1972), S. 111-116 
    ISSN: 1432-0428
    Keywords: Oral glucose tolerance ; insulin secretion ; reflex ; sham-feeding ; enterohormones
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Des chiens éveillés et entraînés portant des fistules de l'oesophage ou de l'estomac ne présentent aucune élévation du sucre sanguin après alimentation simulée de glucose, néanmoins une augmentation considérablede la concentration insulinique dans le sang veineux périphérique apparaît. Celle-ci consiste en deux pics bref s entre la 5 e et la 10 e min et aussi entre la 15 e et la 25 e min. Ces deux pics apparaissent aussi après alimentation simulée d'eau potable, mais à un moindre degré. Leur ordre chronologique correspond aux pics précoces d'IRI que nous avons observés antérieurement, après administration orale de glucose chez des animaux intacts, avant l'élévation glycémique réelle. Après application de glucose dans l'ouverture aborale de la fistule chez des animaux portant une fistule de l'oesophage, il manque le premier pic d'IRI, le deuxième et le troisième pic (provoqués par résorption) apparaissent invariablement. Une insulino-sécrétion intensifiée, couplée à la prise de nourriture et induite par l'ingestion orale est suggérée et discutée dans le cadre de l'«entero-insular axis» du mécanisme de l'insulino-sécrétion.
    Abstract: Zusammenfassung Wache trainierte Hunde mit doppelläufigen Fisteln des Oesophagus oder des Magens zeigen nach Scheinfütterung mit Glucose keinen Blutzucker -anstieg, aber eine sichere Erhöhung des immunchemisch gemessenen Seruminsulins im peripheren Venenblut. Es wurden zwei kurzzeitige Peaks zwischen der 5. und 10. sowie der 15. und 25. min beobachtet. In geringerem Ausmaß fanden sich diese beiden Peaks auch nach Scheinfütterung mit Leitungswasser. Sie entsprechen in ihrer zeitlichen Anordnung den von uns früher beobachteten frühen Insulingipfeln nach oraler Glucosegabe an intakte Tiere vor dem eigentlichen Blutzuckeranstieg. Bei Glucoseverabfolgung in die aborale Fistelöffnung von Oesophagusfistelträgern fehlt der erste IRI-Gipfel, der zweite und der dritte (resorptionsbedingte) sind unverändert ausgeprägt. Es wird eine von Rezeptoren der Mundhöhle ausgelöste Vorwärtskopplung der Insulinsekretion bei oraler Verabfolgung stimulierender Substanzen angenommen und im Rahmen der „enteroinsulinären Achse“ des Insulininkretionsmechanismus diskutiert.
    Notes: Summary After sham-feeding of glucose, conscious trained dogs bearing double-barrelled fistulas of the oesophagus or of the stomach do not show any blood sugar increase. Nevertheless their IRI-levels in the peripheral venous blood increased considerably. This increase consists of two peaks of short duration between the 5th and the 10th as well as the 15th and the 25th min. Such IRI-peaks oceured also after sham-feeding of tap water, but to a smaller extent. Their temporal order corresponds to the early IRI-peaks after oral glucose administration in intact animals, but before the blood glucose increase which was observed by us previously. After the application of glucose into the oral opening of the oesophageal fistula the first IRI-peak does not occur, the second and the third peaks appeared to the same extent. A feed-forward of insulin secretion induced by oral ingestion is suggested. It may be interpreted within the scope of the “entero-insular axis” of the mechanism of insulin secretion.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 1 (1922), S. 850-855 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 93 (1993), S. 21-31 
    ISSN: 1434-6036
    Keywords: 75.10.Jm ; 75.40.Cx ; 75.50.Ee
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigate the ground-state wave function $$|\psi \rangle = \sum\limits_n {\alpha _n } |n\rangle $$ of the spin-1/2J 1-J 2 model on finite square lattices ofN=16(4×4) andN=24(4×6) sites. We find that the Marshall-Peierls phase rule for coefficientsα n , which was derived for unfrustrated bipartite lattices (J 2=0), holds exactly for comparably large frustration up toJ 2/J 1=0.28 (N=16) and up toJ 2/J 1=0.20 (N=24). But even for strong frustration up toJ 2/J 1≈0.45 the Marshall-Peierls rule describes the phase relationships in the ground state excellently. In the region of dominatingJ 2 a phase rule can be formulated as a product of the rules for two independent antiferromagnets. We find that the violation of the Marshall-Peierls sign rule does not dramatically affect the order parameters up toJ 2/J 1≈0.6. To calculate the magnitude of the coefficientsα n by a variational procedure we search for a represantative relationship between theα n and (a few) parametersP 1,n ...P k, n classifying the Ising basis states |n〉. By comparison with the exact ground state we analyze classification schemes based on pair correlations (Jastrow type wave functions) as well as schemes taking into account cluster parameters. While for small frustrationJ 2/J 1〈0.2 a short-range Jastrow description (nearest-neighbour and next nearestneighbour pairing) seems to be sufficient for the adequate description of the ground state one definitly needs longrange pairing and/or cluster parameters to construct a reasonable trial wave function for strong frustration. As an example for a special Jastrow type wave function we discuss an ansatz coming from the spin-wave theory. Finally, we consider the influence of the anisotropic exchangeJ zz ≠J xx ,J yy on the quality of the short-range Jastrow wave function and find and excellent agreement with the exact ground state already for Ising exchange anisotropiesJ xx =J yy ≈0.5J zz .
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of low temperature physics 99 (1995), S. 363-365 
    ISSN: 1573-7357
    Keywords: 75.10J ; 75.50E
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present arguments in favor of the suggestion that the Marshall-Peierls phase relationships and the Lieb-Mattis level ordering survive the frustration in the squarelattice Heisenberg antiferromagnet for relatively strong frustration parameters.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of low temperature physics 99 (1995), S. 359-361 
    ISSN: 1573-7357
    Keywords: 75.10.Jm ; 75.50.Ee ; 71.55.Jv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present exact diagonalisation data for the ground state of finite two-dimensional spin 1/2 Heisenberg antiferromagnets with structural disorder. The combination of antiferromagnetic coupling and structural disorder creates frustation and a local singlet formation which may strongly influence the magnetic ordering. In detail we study the magnetic radial distribution function, the magnetic order parameter M2 as well as a parameter measuring the spin misfit and present these quantities in dependence on the strength of the structural disorder. We estimate the critical disorder where the antiferromagnetic long-range order breaks down.
    Type of Medium: Electronic Resource
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