64 research outputs found
Global impact of the new European and American hypertension guidelines: A perspective from Lebanon
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Should intensive cholesterol lowering play a role in the management of acute coronary syndromes?
No full textPatterns with High Rhythmicity Levels in Multicomponent Liesegang Systems
No full textLiesegang banding is the display of rhythmic strata of precipitate as co-precipitate ions interdiffuse in a gel medium. Complex periodic patterns as well as aperiodic structures could emerge, notably in systems where more than one salt is precipitated. The use of three cations (Co2+, Ni 2+, and Mg2+) in the banded precipitation of their hydroxides resulted in an unusual pattern with a consistently increasing rhythmicity. A periodic structure marked by the succession of band multiplets with increasing number of bands (from singlets to doublets to triplets to quadruplets, consistently) was observed. Such rhythmic patterns are obtained as the initial Mg2+ concentration ([Mg2+]0), chosen as a control parameter, increases through a critical value. At high [Mg2+]0, the trend breaks after a long time elapses. Two types of bifurcation are therefore experienced by such a system: concentration bifurcation and diffusive (time-space) bifurcation. The dynamics is elucidated on the basis of an analysis of the bands in certain groups, and gel regions between these groups, as well as between group blocs (here, a bloc denotes a succession of multiplet groups, with repetitively the same number of bands). Finally, similarities between our system and naturally occurring rhythmic patterns are emphasized and discussed. © 2005 Wiley-VCH Verlag GmbH andamp; Co. KGaA.Al-Ghoul M, 2001, J PHYS CHEM A, V105, P8053, DOI 10.1021-jp011158o; Al-Ghoul M, 2003, J PHYS CHEM A, V107, P1095, DOI 10.1021-jp022433p; ALMSHARRAFIELD M, 2004, THESIS AM U BEIRUT; Antal T, 1998, J CHEM PHYS, V109, P9479, DOI 10.1063-1.477609; Ball P, 1999, SELF MADE TAPESTRY P; Bohm F, 2003, PALAEOGEOGR PALAEOCL, V189, P161, DOI 10.1016-S0031-0182(02)00639-9; DEWERS T, 1988, DIAGENESIS 4, V51, P155; Droz M, 1999, J CHEM PHYS, V110, P9618, DOI 10.1063-1.478927; GOLBETER A, 1996, BIOCH OSCILLATIONS C; Henisch H., 1988, CRYSTALS GELS LIESEG; Jablczynski C. K., 1923, B SOC CHIM FR, V11, P1592; KAI S, 1982, J CHEM PHYS, V76, P1392, DOI 10.1063-1.443131; Kravchenko VV, 1999, DOKL AKAD NAUK+, V364, P687; Kruhl J.H, 1994, FRACTALS DYNAMIC SYS; LEE ME, 1997, CHAOS COMPLEXITY SOC; Liesegang R. E., 1896, CHEM FERNWIRKUNG LIE, V37, P305; Liesegang RE., 1913, GEOLOGISCHE DIFFUSIO; Liesegang R.E., 1896, CHEM FERNWIRKUNG LIE, V37, P331; Liesegang R.E., 1915, ACHATE; Marek M., 1995, CHAOTIC BEHAV DETERM; MATHUR PB, 1959, J INDIAN CHEM SOC, V36, P683; MAY RM, 1987, PROC R SOC LON SER-A, V413, P27, DOI 10.1098-rspa.1987.0098; MAY RM, 1974, SCIENCE, V186, P645, DOI 10.1126-science.186.4164.645; Moxon T., 1996, AGATE MICROSTRUCTURE, P106; MOXON T, 2001, ED CHEM JUL, P105; MSHARRAFIEH M, UNPUB; MULLER SC, 1982, J PHYS CHEM-US, V86, P4078; Ohkawa M, 2000, MINER PETROL, V70, P15, DOI 10.1007-s007100070010; Ortoleva PJ, 1994, GEOCHEMICAL SELF ORG; Peters E., 1991, CHAOS ORDER CAPITAL; Ricken W., 1986, LECT NOTES EARTH SCI, V6; Shapiro J, 1997, BACTERIA MULTICELLUL; Shreif Z, 2002, CHEMPHYSCHEM, V3, P592, DOI 10.1002-1439-7641(20020715)3:7592::AID-CPHC5923.0.CO;2-Z; SULTAN R, 1993, PHYSICA D, V63, P202, DOI 10.1016-0167-2789(93)90155-T; Sultan RF, 2002, PHYS CHEM CHEM PHYS, V4, P1253, DOI 10.1039-b109278m; Sultan RF, 2000, PHYS CHEM CHEM PHYS, V2, P3155, DOI 10.1039-b001221l; Toramaru A, 1996, B VOLCANOL, V58, P393, DOI 10.1007-s004450050147; Winfree A T, 1987, TIME BREAKS 3 DIMENS; Xie DT, 1999, J PHYS CHEM B, V103, P8602, DOI 10.1021-jp991283o88
Performance Deficiencies in the Treatment of ST-Elevation Myocardial Infarction in Québec: “Tis But a Part We See, and Not a Whole”
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Performance Deficiencies in the Treatment of ST-Elevation Myocardial Infarction in Québec: “Tis But a Part We See, and Not a Whole”
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