See article by Wilson et al. [9] (pages 601 –607) in this attenuated by pretreatment with L-arginine or the NO issue. donor NOR-3. These observations suggest a tonic vasoconstrictor activity dynamically opposed by NO, with the net vasomotor effect resulting from the balance of the two

ment of right artrial mapping and P wave-triggered signal-average in patients with paroxysmal atrial fibrillation. J Electrocardiol 1999;32:243–51. 27. Budeus M, Hennersdorf M, Felix O, Reimert K, Perings C, Wieneke H et al. Prediction of atrial fibrillation in patients with cardiac dysfunctions: P wave signal-averaged ECG and chemoreflexsensitivity in atrial fibrillation. Europace 2007;9:601–7.

Author details Epidemiology Division, Tropical Medicine Institute “Pedro Kouri”, Autopista Novia del Mediodía, Km. 6 1⁄2, La Lisa, Marianao 13, PO Box 601, Havana City, Cuba. Department of Public Health, Institute of Tropical Medicine, Nationalestraat 155, 2000 Antwerp, Belgium. Department of Public Health, Ghent University, Ghent, Belgium. Latin-American Faculty of Social Sciences (FLACSO), Ha...

In the stochastic cellular automaton of rule 18 defined by S. Wolfram [Rev. Mod. Phys. 55, 601 (1983)] the crossover of the critical behaviour induced by nonlocal site exchange was investigated using the coherent anomaly method. The continuous variation of the critical β exponent was confirmed. 64.60.Fr, 05.40.+j Typeset using REVTEX

1 Biophysics Unit (CSIC, UPV/EHU) and Biochemistry and Molecular Biology Department, University of the Basque Country (UPV/EHU), P.O. Box 644, 48080 Bilbao, Spain 2 Centro de Biología Molecular Severo Ochoa (CSIC, UAM), c/Nicolás Cabrera, 1, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain * Correspondence: [email protected] (J.L.N.); [email protected] (L.C.); Tel.: +34-...