High domain wall velocities induced by current in ultrathin Pt/Co/AlOx wires with perpendicular magnetic anisotropy

Current-induced domain wall (DW) displacements in an array of ultrathin Pt/Co/AlOx wires with perpendicular magnetic anisotropy have been directly observed by wide field Kerr microscopy. DWs in all wires in the array were driven simultaneously and their displacement on the micrometer-scale was controlled by the current pulse amplitude and duration. At the lower current densities where DW displacements were observed (j less than or equal to 1.5 x 10^12 A/m^2), the DW motion obeys a creep law. At higher current density (j = 1.8 x 10^12 A/m^2), zero-field average DW velocities up to 130 +/- 10 m/s were recorded.Comment: Minor changes to Fig. 1(b) and text, correcting for the fact that domain walls were subsequently found to move counter to the electron flow. References update

Identificação taxonômica de leveduras ambientais por espectrometria de massa MALDI-TOF.

O objetivo deste trabalho foi identificar, por MALDI-TOF MS, 99 leveduras isoladas de uvas cultivadas no Vale do São Francisco/PE para inseri-las na Coleção de Leveduras do Centro Nacional de Pesquisa de Uva e Vinho (WDCM 1056)

Isolamento e caracterização de cepas de Saccharomyces cerevisiae de interesse em produção de vinho

Despite the availability of several Saccharomyces cerevisiae commercial strains intended for wine production, strains isolated from winery regions are usually more adapted to their own climatic conditions, grapes and also partially responsible for particular characteristics that frequently identify specific wines and regions. Thus the microbiota of an important winery region (Colombo) was studied in order to isolate and characterize S. cerevisiae strains that could be used on wine production. From 61 yeasts isolated, 14 were identified as S. cerevisiae. Some of them showed fermentative characteristics even better than commercial strains indicating that they could be applied on wine production in order to increase the quality and assure the particular wine characteristics of that region

On the relevance of percolation theory to the vulcanization transition

The relationship between vulcanization and percolation is explored from the perspective of renormalized local field theory. We show rigorously that the vulcanization and percolation correlation functions are governed by the same Gell--Mann-Low renormalization group equation. Hence, all scaling aspects of the vulcanization transition are reigned by the critical exponents of the percolation universality class.Comment: 9 pages, 2 figure

Evaluation of propolis and its subproduct as an inhibitor of growth and biofilm formation in vaginal yeast from pregnant women

Objectives The treatment of vulvovaginal candidiasis (VVC) is still unsatisfactory, especially in pregnant women, being promising to the utilization of alternative therapies. Propolis extract solution (PES) has demonstrated antifungal efficacy and low toxicity. In addition, the subproduct of propolis extract solution (SPES) is produced during the process of preparing PES and is usually discarded, but can still sub- mit substances responsible for biological effects, such as the polyphenols, responsible for the therapeutic activity of propolis. SPES have not been investigated or used as an antimicrobial agent. Thus, the objective of the present study was to investigate the effect of PES and SPES on Candida spp. isolated from the vaginal material of pregnant women. Methods Vaginal samples from 291 pregnant women were collected and cultivated for yeasts, which were identified by the classical method and performing susceptibility tests against PES, SPES and conventional antifungal agents. The anti-biofilm effect and cytotoxicity tests of the PES and SPES were evaluated. Results In 38.48% (112/291) of culture was positive for Candida species. There were patients with two different species, being a total of 115 yeasts (82.61% C. albicans; 6.08% C. glabrata; 5.22% C. tropi- calis; 5.22% C. parapsilosis and 0.87% C. krusei). PES and SPES were effective, even against isolates resistant to conventional antifungal (Table 1) and reduced about 25% C. tropicalis biofilm, besides presenting its low toxicity in the concentrations of fungicides. Conclusion Thus, in addition to the PES, SPES can also be a promising alternative treatment, especially in this population

Intermediate temperature dynamics of one-dimensional Heisenberg antiferromagnets

We present a general theory for the intermediate temperature (T) properties of Heisenberg antiferromagnets of spin-S ions on p-leg ladders, valid for 2Sp even or odd. Following an earlier proposal for 2Sp even (Damle and Sachdev, cond-mat/9711014), we argue that an integrable, classical, continuum model of a fixed-length, 3-vector applies over an intermediate temperature range; this range becomes very wide for moderate and large values of 2Sp. The coupling constants of the effective model are known exactly in terms of the energy gap above the ground state (for 2Sp even) or a crossover scale (for 2Sp odd). Analytic and numeric results for dynamic and transport properties are obtained, including some exact results for the spin-wave damping. Numerous quantitative predictions for neutron scattering and NMR experiments are made. A general discussion on the nature of T>0 transport in integrable systems is also presented: an exact solution of a toy model proves that diffusion can exist in integrable systems, provided proper care is taken in approaching the thermodynamic limit.Comment: 38 pages, including 12 figure

Effects of surfaces on resistor percolation

We study the effects of surfaces on resistor percolation at the instance of a semi-infinite geometry. Particularly we are interested in the average resistance between two connected ports located on the surface. Based on general grounds as symmetries and relevance we introduce a field theoretic Hamiltonian for semi-infinite random resistor networks. We show that the surface contributes to the average resistance only in terms of corrections to scaling. These corrections are governed by surface resistance exponents. We carry out renormalization group improved perturbation calculations for the special and the ordinary transition. We calculate the surface resistance exponents \phi_{\mathcal S \mathnormal} and \phi_{\mathcal S \mathnormal}^\infty for the special and the ordinary transition, respectively, to one-loop order.Comment: 19 pages, 3 figure

Interfacial adsorption phenomena of the three-dimensional three-state Potts model

We study the interfacial adsorption phenomena of the three-state ferromagnetic Potts model on the simple cubic lattice by the Monte Carlo method. Finite-size scaling analyses of the net-adsorption yield the evidence of the phase transition being of first-order and $k_{\rm B} T_{\rm C} / J = 1.8166 (2)$.Comment: 14 page

QUALIDADE DO VINHO PRODUZIDO NO MUNICÍPIO DE COLOMBO NA SAFRA 2000

O presente trabalho é uma das etapas do Projeto de Extensão No 248/PROEC - MELHORIA DA QUALIDADE DO VINHO PRODUZIDO NO MUNICÍPIO DE COLOMBO. Após o trabalho emcampo, com visitas às diversas vinícolas para acompanhamento do proceso de produção, foram realizadas análises físico-químicas das diferentes amostras de vinhos, cujos resultados foram comparados com os padrões fixados pelo Ministério da Agricultura, procurando relacionar características impróprias com problemas nos procedimentos adotados durante a fase de produção. Abstract The aims of this study were to investigate and characterize the flaws occuring during the production of wine in the surroundings vines of Colombo, Paraná, Brazil. Analysis of the physical-chemical properties of different samples obtained from the final wine batches was performed and the results compared to standards stablished by the Brazilian Agriculture Ministry, and the results discussed (Projeto No 248/PROEC MELHORIA DA QUALIDADE DO VINHO PRODUZIDO NO MUNICÍPIO DE COLOMBO

QUALIDADE DO VINHO PRODUZIDO NO MUNICÍPIO DE COLOMBO NA SAFRA 2001

O presente trabalho faz parte da segunda etapa do Projeto de Extensão No 248/PROEC MELHORIA DA QUALIDADE DO VINHO PRODUZIDO NO MUNICÍPIO DE COLOMBO, com a finalidade de acompanhar e avaliar os resultados da implantação de procedimentos de modernização da tecnologia, identificados como mais adequados durante a realização do curso Elaboração de Vinhos, ministrado como parte integrante da primeira etapa do projeto. Após o trabalho em campo, com visitas às diversas vinícolas, foram realizadas análises físico-químicas das diferentes amostras de vinhos, cujos resultados foram comparados com os padrões fixados pelo Ministério da Agricultura. QUALITY OF THE WINE PRODUCED IN COLOMBO CITY IN HARVEST OF 2001 Abstract The present paper is part of the second phase of the Extension Project nº 248/PROEC IMPROVEMENT OF QUALITY OF THE WINE PRODUCED IN COLOMBO CITY and shows the results of the implantation of modern technological wine making procedures on small wineries of Colombo City. On the first phase of project, themost appropriate techniques were identified during a course on WINE MAKING presented to winemakers of the region. On the second phase, besides visiting small wineries, physical and chemical analyses were carried out on several wine samples and the results were compared with patterns established by the Brazilian Ministry of Agriculture