<html>
<head>
</head>
<body>
<font face="Times New Roman" size="6">
<div align="center"><font color="navy"><b>Old Dominion University</b></font></div>
<div align="center"><font color="navy"><b>Department of Physics</b></font></div>
<div align="center"><font color="navy"> </font></div>
<div align="center"><font color="#31849B"><b>Fall Colloquium Series</b></font></div>
<div align="center"><font face="Calibri" size="2"> </font></div>
<div align="center"><font size="5" color="#17365D"><b>Tuesday September 18, 2012</b></font></div>
<div align="center"><font face="Calibri" size="2" color="navy"> </font></div>
<div align="center"><font size="5" color="#31849B"><b>"Cardiac Arrhythmias and the Geodesic Principle for Filaments in Excitable Media"</b></font></div>
<div align="center"><font face="Calibri" size="2"> </font></div>
<div align="center"><font face="Calibri" size="2"><br>
<font face="Times New Roman" size="5" color="#1F497D"><b>Dr. Christian Zemlin</b></font></font></div>
<div align="center"><font size="5" color="#1F497D"><b>Old Dominion University</b></font></div>
<div align="center"><font size="3"> </font></div>
<div align="left"><font size="3">In the Cardiac Electrophysiology Lab we study the mechanisms of arrhythmias both experimentally and from a theoretical point of view. Arrhythmias are disturbances in
the normal electrical activity of the heart. In experiments, we extract animal hearts visualize their electrical activity using voltage-sensitive fluorescent probes. The most dangerous arrhythmias are reentrant arrhythmias; they are composed of self-sustained,
high-frequency waves called "scroll waves" that rotate around one-dimensional phase singularities called filaments. Scroll waves exist not only in the heart but in a large variety of excitable media. The complex dynamics of scroll waves can be most efficiently
described by via the dynamics of their filaments. Particularly elegant is the "geodesic principle" that allows the computation of steady state filaments for a large class of excitable media.</font></div>
<div><font size="3"> </font></div>
<div><font face="Calibri" size="2"> </font></div>
<div align="center"><font size="4">Presentation: OCNPS 200 @ 3:00 pm</font></div>
<div align="center"><font size="4">Refreshments: Atrium @ 2:30 pm</font></div>
<div align="center"><font size="3"> </font></div>
<div><font face="Calibri" size="2"> </font></div>
<div align="center"><font size="5">More details at <a href="http://sci.odu.edu/physics/"><font color="blue"><u>http://sci.odu.edu/physics/</u></font></a></font></div>
<div align="center"><font size="5">All are Welcome!</font></div>
<div align="center"><font face="Calibri" size="2"> </font></div>
<div><font face="Calibri" size="2"> </font></div>
<div><font face="Calibri" size="2"> </font></div>
</font>
</body>
</html>