The universality class of fluctuating pulled fronts

It has recently been proposed that fluctuating ``pulled'' fronts propagating into an unstable state should not be in the standard KPZ universality class for rough interface growth. We introduce an effective field equation for this class of problems, and show on the basis of it that noisy pulled fronts in {\em d+1} bulk dimensions should be in the universality class of the {\em (d+1)+1}D KPZ equation rather than of the {\em d+1}D KPZ equation. Our scenario ties together a number of heretofore unexplained observations in the literature, and is supported by previous numerical results.Comment: 4 pages, 2 figure

Polyethersulfone supported titanium complexes as ethylene polymerization catalysts

Polyethersulfone has been used as the support to anchor TiCl4 or Cp2TiCl2 through dative 'O-Ti' bond. The supported complexes in combination with methylaluminoxane are effective ethylene polymerization catalysts. The polyethylene made by the supported catalysts, especially the titanocene-derived catalyst, has low polydispersity indicating single site character

An Outbreak of Cryptosporidium parvum across England & Scotland Associated with Consumption of Fresh Pre-Cut Salad Leaves, May 2012

Background We report a widespread foodborne outbreak of Cryptosporidium parvum in England and Scotland in May 2012. Cases were more common in female adults, and had no history of foreign travel. Over 300 excess cases were identified during the period of the outbreak. Speciation and microbiological typing revealed the outbreak strain to be C. parvum gp60 subtype IIaA15G2R1. Methods Hypothesis generation questionnaires were administered and an unmatched case control study was undertaken to test the hypotheses raised. Cases and controls were interviewed by telephone. Controls were selected using sequential digit dialling. Information was gathered on demographics, foods consumed and retailers where foods were purchased. Results Seventy-four laboratory confirmed cases and 74 controls were included in analyses. Infection was found to be strongly associated with the consumption of pre-cut mixed salad leaves sold by a single retailer. This is the largest documented outbreak of cryptosporidiosis attributed to a food vehicle

<i style="">In vitro </i>antioxidant activity of<i style=""> Diospyros malabarica </i>Kostel bark

39-44Antioxidant activity of defatted methanol extract of D. malabarica bark was studied for its free radical scavenging property on different in vitro models e.g. 1,1-diphenyl-2-picryl hydrazyl (DPPH), nitric oxide, superoxide, hydroxyl radical and lipid peroxide radical model. The extract showed good dose-dependent free radical scavenging property in all the models except in hydroxyl radical inhibition assay. IC50 values were found to be 9.16, 13.21, 25.27 and 17.33 µg/ml respectively in DPPH, nitric oxide, superoxide and lipid peroxidation inhibition assays. In hydroxyl radical inhibition assay 1000 µg/ml extract showed only 10% inhibition with respect to the control. Measurement of total phenolic compounds by Folin-Ciocalteu’s phenol reagent indicated that 1mg of the extract contained 120.7µg equivalent of pyrocatechol. The results indicate that the antioxidant property of the extract may be due to the high content of phenolic compounds. However, the underlying mechanism may not involve hydroxyl radical scavenging property

Colossal magnetoresistance study in nanophasic La(0.7)Cao(0.3)MnO(3) manganite

In this study we report the effect of sintering temperature on the low field magnetotransport properties of La0.7Ca0.3MnO3 manganite synthesized through the polymeric precursor route. The La0.7Ca0.3MnO3 has been sintered at 600 degrees C (S6), 700 degrees C (S7), 800 degrees C (S8), 900 degrees C (S9) and 1000 degrees C (S10). X-ray diffraction confirms that phase formation starts at 600 degrees C. All the samples are single phasic having an orthorhombic unit cell. The lattice parameters decrease on lowering the sintering temperature (T-S). The crystallite as well as the grain size also show strong dependence on the sintering temperature. All the samples possess characteristic insulator-metal (T-IM) as well as paramagnetic-ferromagnetic (PM-FM) (T-C) transitions. The TC varies in a small range [272-256 K] as a function of sintering temperature whereas the T-IM goes down from 267 K (S10) to 138 K (S6), a strong decrease of 129 K. This T-C-T-IM discrepancy is due to the fact that whereas the former is an intrinsic characteristic, the latter depends strongly on the extrinsic factors e.g. synthesis conditions, grain boundaries and associated disorders. For all the samples magnetoresistance (MR) shows strong dependence on T-S. The MR increases on lowering the temperature as well as on increasing the field with the occurrence of an intrinsic contribution around T-C. These variations of MR for all the samples have been explained in terms of the microstructural variations and spin-polarized tunnelling at low temperatures