[doi:10.1063/1.3623764]“
“Ticks are recognized as the main vectors and reservoirs of spotted fever group rickettsiae. We searched for the

most prevalent Rickettsia spp. in Poland and found R. slovaca and R. helvetica bacteria in ticks in southern and central Poland; R. raoulti was found in ticks in all parts of Poland.”
“A novel bis(beta-ketoamino)Ni(II) complex catalyst, NiCF3C(O)CHC[N(naphthyl)]CH3(2), was synthesized, and the structure was solved by a single-crystal X-ray refraction technique. The copolymerization of norbornene with higher 1-alkene was carried out in toluene with catalytic systems based on nickel(II) complexes, NVP-BSK805 NiRC(O)CHC[N(naphthyl)]CH3(2)(R=CH3, CF3) and B(C6F5)(3), and high activity was exhibited by both catalytic systems. The effects of the catalyst structure and comonomer feed content on the polymerization activity and the incorporation rates were investigated. The reactivity ratios were determined to be r(1-octene) = 0.009 and r(norbornene) = 13.461 by the Kelen-Tudos method for the NiCH3C(O)CHC[N(naphthyl)]CH3(2)/B(C6F5)(3) system. The achieved copolymers were confirmed to be vinyl-addition copolymers through the analysis of H-1-NMR and C-13-NMR. The thermogravimetric analysis results showed that the copolymers exhibited good thermal stability (decomposition temperature, T-dec > 400 degrees C), and the

glass-transition temperature of the copolymers were observed between 215 and 275 degrees C. The copolymers were confirmed to be noncrystalline by wide-angle X-ray click here diffraction analysis and showed good solubility in common organic solvents. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012″
“In this work, the relaxation dynamics (RD) in carbon black (CB)-polymer composites under stress is investigated by two complementary approaches: effective permittivity and electric modulus formally defined as

the reciprocal of the complex relative permittivity. Experimental measurements Baf-A1 manufacturer of the microwave data over the of CB volume fractions below the percolation threshold and microwave frequencies studied agree well with the predictions of the Cole-Cole (CC) phenomenological model of RD. Similar conclusions about the RD of subpercolative samples could be reached by viewing the data in terms of their e and M representations. For subpercolative systems, the CB aggregates show nearly no influence on the dielectric relaxation through the matrix. However, we show that the relaxation time scale is increased by two orders of magnitude when CB volume fraction is increased from below to above the percolation threshold at about 8.5 vol%. Extraction of the RD information from CC modeling shows that when the system is subpercolative the dielectric relaxation kinetics is proportional to lambda 1/lambda(2), which is consistent with the Gaussian molecular network (affine network) model in the low-strain case. (C) 2011 American Institute of Physics. [doi:10.1063/1.