Now showing items 1-12 of 12

    • Complex wave patterns in an effective reaction–diffusion model for chemical reactions in microemulsions 

      Alonso Muñoz, Sergio; John, Karin; Baer, Markus (American Institute of Physics (AIP), 2011-03-07)
      Article
      Open Access
      An effective medium theory is employed to derive a simple qualitative model of a pattern forming chemical reaction in a microemulsion. This spatially heterogeneous system is composed of water nanodroplets randomly distributed ...
    • Effective medium approach for heterogeneous reaction-diffusion media 

      Alonso Muñoz, Sergio; Baer, Markus; Kapral, Raymond (American Institute of Physics (AIP), 2009-12-01)
      Article
      Open Access
      An effective medium theory that can be used to calculate effective diffusion and reaction rate coefficients in random heterogeneous reaction-diffusion systems is described. The predictions of the theory are compared with ...
    • Effects of reduced discrete coupling on filament tension in excitable media 

      Alonso Muñoz, Sergio; Baer, Markus; Panfilov, Alexander V (Institute of Physics (IOP), 2011-03-29)
      Article
      Open Access
      Wave propagation in the heart has a discrete nature, because it is mediated by discrete intercellular connections via gap junctions. Although effects of discreteness on wave propagation have been studied for planar traveling ...
    • Intracellular mechanochemical waves in an active poroelastic model 

      Radszuweit, Markus; Alonso Muñoz, Sergio; Engel, Harald; Baer, Markus (American Institute of Physics (AIP), 2013-04-25)
      Article
      Open Access
      Many processes in living cells are controlled by biochemical substances regulating active stresses. The cytoplasm is an active material with both viscoelastic and liquid properties. We incorporate the active stress into a ...
    • Mechanochemical pattern formation in simple models of active viscoelastic fluids and solids 

      Alonso Muñoz, Sergio; Radszuweit, Markus; Engel, Harald; Baer, Markus (Institute of Physics (IOP), 2017-11-01)
      Article
      Open Access
      The cytoskeleton of the organism Physarum polycephalum is a prominent example of a complex active viscoelastic material wherein stresses induce flows along the organism as a result of the action of molecular motors and ...
    • Modeling domain formation of MARCKS and protein kinase C at cellular membranes 

      Alonso Muñoz, Sergio; Baer, Markus (EDP Sciences, 2014-01-30)
      Article
      Open Access
      Phosphorylation and dephosphorylation of proteins are mechanisms of activation and deactivation which regulate many cellular processes. Both mechanisms have been usually described in well mixed environments. MARCKS is a ...
    • Nonlinear physics of electrical wave propagation in the heart: a review 

      Alonso Muñoz, Sergio; Baer, Markus; Echebarría Domínguez, Blas (2016-08-12)
      Article
      Open Access
      The beating of the heart is a synchronized contraction of muscle cells (myocytes) that are triggered by a periodic sequence of electrical waves (action potentials) originating in the sino-atrial node and propagating over ...
    • Reentry near the percolation threshold in a heterogeneous discrete model for cardiac tissue 

      Alonso Muñoz, Sergio; Baer, Markus (American Institute of Physics (AIP), 2013-04-09)
      Article
      Open Access
      Arrhythmias in cardiac tissue are related to irregular electrical wave propagation in the heart. Cardiac tissue is formed by a discrete cell network, which is often heterogeneous. A localized region with a fraction of ...
    • Spatio-temporal dynamics induced by competing instabilities in two asymmetrically coupled nonlinear evolution equations 

      Shueler, David; Alonso Muñoz, Sergio; Torcini, Alexandro; Baer, Markus (Institute of Physics (IOP), 2014-12-31)
      Article
      Open Access
      Pattern formation often occurs in spatially extended physical, biological, and chemical systems due to an instability of the homogeneous steady state. The type of the instability usually prescribes the resulting spatio-temporal ...
    • Supernormal conduction in cardiac tissue promotes concordant alternans and action potential bunching 

      Echebarría Domínguez, Blas; Roeder, Georg; Engel, Harald; Davidsen, Joern; Baer, Markus (2011-04-04)
      Article
      Open Access
      Supernormal conduction (SNC) in excitable cardiac tissue refers to an increase of pulse (or action potential) velocity with decreasing distance to the preceding pulse. Here we employ a simple ionic model to study the ...
    • Surfactant-induced gradients in the three-dimensional Belousov-Zhabotinsky reaction 

      Kupitz, Dennis; Alonso Muñoz, Sergio; Baer, Markus; Hauser, Marcus (2011-11-10)
      Article
      Open Access
      Scroll waves are prominent patterns formed in three-dimensional excitable media, and they are frequently considered highly relevant for some types of cardiac arrhythmias. Experimentally, scroll wave dynamics is often studied ...
    • Twists of opposite handedness on a scroll wave 

      Dähmlow, Patricia; Alonso Muñoz, Sergio; Baer, Markus; Hauser, Marcus (American Institute of Physics (AIP), 2013-06-05)
      Article
      Open Access
      The dynamic interaction of scroll waves in the Belousov-Zhabotinsky reaction with a vertically orientated gradient of excitability is studied by optical tomography. This study focuses on scroll waves, whose filaments were ...