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  • 101. Zentis, Peter D.
    et al.
    Frohnapfel, Manuel
    Rantanen, Ville
    Weidtkamp-Peters, Stefanie
    Felekyan, Suren
    Kuehnemuth, Ralf
    Sisamakis, Evangelos
    Xu, Lei
    KTH, School of Engineering Sciences (SCI), Applied Physics, Experimental Biomolecular Physics.
    Perols, Anna
    KTH, School of Biotechnology (BIO), Molecular Biotechnology.
    Arden-Jacob, Jutta
    Zilles, Alexander
    Oberlaender, Martina
    Fritzsche, Britta
    Nygren, Per-Åke
    Eriksson Karlström, Amelie
    KTH, School of Biotechnology (BIO), Molecular Biotechnology.
    Hautaniemi, Sampsa
    Drexhage, Karl-Heinz
    Auer, Gert
    Habermann, Jens K.
    Widengren, Jerker
    KTH, School of Engineering Sciences (SCI), Applied Physics, Experimental Biomolecular Physics.
    Seidel, Claus A. M.
    Cancer Diagnostics by Multiparameter Fluorescence Image Spectroscopy: A Bioinformatic Classifier Trained on Cultured Immunostained Cells2013In: Biophysical Journal, ISSN 0006-3495, E-ISSN 1542-0086, Vol. 104, no 2, p. 342A-342AArticle in journal (Other academic)
  • 102. Århem, P.
    et al.
    Klement, G.
    Blomberg, Clas
    KTH, School of Engineering Sciences (SCI), Theoretical Physics, Theoretical Biological Physics.
    Channel density regulation of firing patterns in a cortical neuron model2006In: Biophysical Journal, ISSN 0006-3495, E-ISSN 1542-0086, Vol. 90, no 12, p. 4392-4404Article in journal (Refereed)
    Abstract [en]

    Modifying the density and distribution of ion channels in a neuron (by natural up- and downregulation or by pharmacological intervention or by spontaneous mutations) changes its activity pattern. In this investigation we analyzed how the impulse patterns are regulated by the density of voltage-gated channels in a neuron model based on voltage-clamp measurements of hippocampal interneurons. At least three distinct oscillatory patterns, associated with three distinct regions in the Na-K channel density plane, were found. A stability analysis showed that the different regions are characterized by saddle-node, double-orbit, and Hopf-bifurcation threshold dynamics, respectively. Single, strongly graded action potentials occur in an area outside the oscillatory regions, but less graded action potentials occur together with repetitive. ring over a considerable range of channel densities. The relationship found here between channel densities and oscillatory behavior may partly explain the difference between the principal spiking patterns previously described for crab axons (class 1 and 2) and cortical neurons ( regular. ring and fast spiking).

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