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  • fixed point index  (1)
  • plasmalemma  (1)
  • 1990-1994  (2)
  • 1
    Electronic Resource
    Electronic Resource
    The index of lyapunov stable fixed points in two dimensions (1994)
    Springer
    Journal of dynamics and differential equations 6 (1994), S. 631-637 
    Details
    ISSN: 1572-9222
    Keywords: stability ; fixed point index ; periodic solutions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this paper, we prove that a stable isolated fixed point of an orientation preserving local homeomorphism onR 2 has fixed point index 1. We also give a number of applications to differential equations. In particular, we deduce that a number of existence methods for producing periodic solutions of differential equations in the plane always produce unstable solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02218851
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of diacetyl piquerol on H+-ATPase activity of microsomes fromIpomoea purpurea (1990)
    Springer
    Journal of chemical ecology 16 (1990), S. 2253-2261 
    Details
    ISSN: 1573-1561
    Keywords: Piquerol ; Piqueria trinervia ; modes of action ; allelopathy ; allelochemicals ; microsomes ; Ipomoea purpurea ; plasmalemma ; tonoplast ; germination ; H+-ATPase ; proton pumps
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The effect of an allelopathic compound, diacetyl-piquerol on the H+ -ATPase activity of the microsomal fraction from the radicles of a common weedIpomoea purpurea was studied. The diacetyl-piquerol inhibited the germination and radicle growth fromI. purpurea; the radicle growth was increasingly inhibited (10% to 100%) as piquerol concentrations were raised (10 μM to 1000 μM). The H+-ATPase activity was inhibited (48%) by 500 μM diacetyl-piquerol, and this inhibition was higher in plasma membrane ATPase (67.2%) than in tonoplast membrane ATPase (31.4%). Additional studies of the precise physiological mechanisms of interference caused by allelopathic compounds are needed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01026935
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