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  • 1990-1994  (1)
  • 1985-1989  (1)
  • 1915-1919
  • 1993  (1)
  • 1987  (1)
  • Myocyte  (1)
  • Punaise du Pacifique  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The effect of oximes on the dihydropyridine-sensitive Ca current of isolated guinea-pig ventricular myocytes (1993)
    Springer
    Pflügers Archiv 422 (1993), S. 325-331 
    Details
    ISSN: 1432-2013
    Keywords: Myocyte ; Voltage clamp ; Ionic currents ; Oximes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Exposure of isolated guinea-pig ventricular myocytes to the uncharged oximes 2,3 butanedionemonoxine (BDM) and norPAM (but not by the charged PAM) results in a dose-dependent reduction of the duration of the action potential. The nifedipine-sensitive Ca current is fully inhibited by BDM (IC505.8±0.4 mM) and nor PAM but is little affected by PAM. This inhibition is unaltered by the presence of BAY K 8644 but is antagonized by isoprenaline. The effect of isoprenaline is more pronounced when the solution in the patch pipette contains the non-hydrolysable analogue of adenosine 5′-triphosphate, ATPγS (the IC50 is increased to 44.0±5.2 mM). A hastening of the inactivation of the L-type Ca current persists when either 10 mM 1,2-bis(2-aminophenoxy)-ethane-N, N, N′, N-tetraacetic acid (BAPTA) or 3 mM ATPγS is present in the pipette solution or when BAY K 8644 or isoprenaline are present in the bathing fluid. These results suggest that the inhibition of the Ca current is due to the phosphatase-like activity of the oximes but differs in some respects from previous work where a reduced level of phosphorylation is achieved by the introduction of protein kinase inhibitors or protein phosphatases into the sarcoplasm in guinea-pig myocytes. These differences could be explained if Ca channel availability is regulated by at least two sites of cAMP-dependent phosphorylation with oximes able to rapidly dephosphorylate both sites, while one of these sites is not readily dephosphorylated by the endogenous phosphatases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00374287
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Functional response of pacific damsel bug,Nabis kinbergii [Hemiptera: Nabidae] (1987)
    Springer
    BioControl 32 (1987), S. 303-309 
    Details
    ISSN: 1573-8248
    Keywords: Pacific damsel bug ; nabid ; functional response ; Punaise du Pacifique ; nabide ; réponse fonctionnelle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Résumé La punaise,Nabis kinbergii Reuter est rencontrée communément dans les champs de luzerne à la fin de l'été et durant l'automne en Nouvelle Zélande. Son potentiel en tant que prédateur des espèces communes d'insectes ravageurs n'a pas encore été étudié. Ce travail rend compte de la roponse fonctionnelle des femelles adultes et des 5e stades larvaires de cette punaise vis-à-vis de deux espèces proies, le miride:Sidnia kinbergi (Stal) et le puceron du pois:Acyrtosiphon pisum (Harris). Une équation deHolling (1959) de type II définit bien la réponse fonctionnelle de ce prédateur sauf lorsque les 5e stades n'ont que des nymphes du Miride pour proie. Cette punaise,Nabis kinbergii manifeste des réponses identiques à celles d'un autreNabidae: Reduviolus americoferus (L.).
    Notes: Abstract The functional responses of adult and 5th instar Pacific damsel bug,Nabis kinbergii Reuter were determined under laboratory conditions using Australian crop mirid,Sidnia kinbergi (Stal), and pea aphid,Acyrthosiphon pisum (Harris) as prey.Holling's (1959) type II equation was found to adequately define the functional response of this predator except when 5th instar nymphs were provided with Australian crop mirid as prey. In this instance, a type III response was found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02373255
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    Paper (German National Licenses)
    Fulltext
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