The Rarita-Schwinger Particles Under de Influence of Strong Magnetic Fields

In this work, we calculate the solutions of the Rarita-Schwinger equation with the inclusion of the eletromagnetic interaction. Our gauge and coupling prescription choices lead to Dirac-type solutions. One of the consequences of our results are the Landau level occupation of particles, quite different from the usual spin 1/2 particle system occupation numbers.Comment: 12 page

Innovative Virtual Lab for Improving Safety and Port Operations

Computer simulation makes it possible to reproduce real systems and processes in a synthetic environment. In this way virtual analysis turn to be possible and it complex scenarios are suitable to be simulated. In the proposed paper is presented a port system where to study the behavior respect operations and accidents and to consider interaction among multiple players. The simulation is applied to create a Virtual Lab able to evaluate and investigate the development of new procedures, contingency plans during crises. The development of models to be used in simulations is clearly a critical aspect, since the consistency of the simulation depend on the quality of the models and their interaction; in this case the authors used their experience in the field to guarantee a successful Verification and Validation. In this case study, models are used for simulations of phenomena related to port accidents and crises with particular attention to dispersion system of liquid contaminant on sea surface and dispersion of toxic gases into atmosphere. These models have been tested in the Alacres2 simulator in order to create as an effective tool to observe and study the evolution and impact of dangerous situations, as well as a decision-making support to define response plans crises

Caracterização molecular de microrganismos isolados do ecossistema agrícola do cerrado. I. Bactérias endofíticas do milho.

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Low cost capillary rheometer and self-reinforcement module

The results obtained with a capillary rheometer and die-drawing module, designed and assembled in our laboratory, are presented. The modules were connected to a universal stress-strain equipment, which is responsible for the movements and the data acquisition. The results obtained with the capillary module, assembled in this work, were comparable to those obtained with a commercial equipment. The low cost is one of the main advantages of the reported equipment. The die-drawing method was also capable of inducing a molecular orientation and enhancing the flexural properties of a polymer material in comparison to the non-reinforced sample.São reportados os testes realizados com dois módulos capazes de realizar análises de reometria capilar e também induzir a orientação molecular (também chamado como auto-reforçamento) de polímeros, os quais foram projetados e montados neste laboratório. Os módulos são acoplados a uma Máquina Universal de Ensaios, a qual é responsável pela realização dos ensaios, sendo o baixo custo o principal atrativo dos módulos. Os resultados obtidos com o módulo de reometria capilar foram comparados com os obtidos num reômetro comercial e apresentaram boa concordância. O auto-reforçamento foi capaz de induzir a orientação molecular e levar a um aumento de aproximadamente 50% nas propriedades de flexão, se comparadas às amostras não reforçadas.6872Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP

A prospective seroepidemiological study of human herpesvirus-8 infection and the risk of multiple myeloma

Presence of the Human Herpesvirus 8 (HHV8) genome has been reported in the bone marrow of multiple myeloma (MM) patients. So far, serological studies of HHV8 and MM have been inconsistent but have not included prospective epidemiological studies. We evaluated whether HHV8 infection is associated with increased risk for MM in a prospective population-based study of 39 000 Finnish subjects who donated serum samples in the period 1968–72. Serum samples from 47 subjects who developed MM during a 23-year follow-up and 224 age, area of residence and sex-matched subjects who remained healthy over a similar follow-up period were evaluated for HHV8 antibodies at enrolment, as assayed both with an immunofluorescence assay (IFA) for lytic and latent HHV8 antigens and by Western blot (WB) with three recombinant HHV8 proteins (ORFs 65, 73 and K8.1A). HHV8 seropositivity for at least one HHV8 protein on WB was found in 7% of the Finnish population and was not associated with the risk of developing MM (Relative Risk (RR) = 0.89, Confidence Interval (CI): 0.25–3.25). HHV8 seropositivity for lytic and latent antigens in the IFA was found in 16% and 0.4% of the Finnish population and tended to associate with risk of MM (RR = 2.02, CI: 0.94–4.33 and RR = 10.00, CI: 0.91–110.29, respectively). In conclusion, no statistically significant evidence for an association between HHV8 infection and the risk of future MM was found. © 2001 Cancer Research Campaign http://www.bjcancer.co

Caracterização molecular de microorganismos do ecossistema agricola do cerrado. III. Acremonium strictum.

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Joint Nordic prospective study on human herpesvirus 8 and multiple myeloma risk

An association between human herpesvirus 8 (HHV8) and multiple myeloma (MM) has been reported, though most studies have not confirmed such association. To follow-up on a previous prospective seroepidemiological study, where HHV8 tended to associate with MM risk, we linked five large serum banks in the Nordic countries with the Nordic cancer registries and 329 prospectively occurring cases of MM were identified, together with 1631 control subjects matched by age and gender. The HHV8 seroprevalences among cases and controls were similar (12 and 15%, respectively) and HHV8 seropositivity did not associate with the risk of MM, neither when considering positivity for lytic antibodies (relative risk (RR)=0.8, 95% confidence interval (CI)=0.5–1.1) nor for latent antibodies (RR=0.6, 95% CI=0.1–2.7). Similar risks were seen when analysis was restricted to case–control sets with at least 2 years lag before diagnosis (RR=0.8, 95% CI=0.5–1.2 and RR=0.9, 95% CI=0.1–4.2). In conclusion, the data indicate that HHV8 infection is not associated with MM

Unprecedented magnetoresistance in Cd-substituted Tl2Mn2O7 pyrochlores

3 pages, 3 figures.Moderate pressure techniques (P = 20 kbar) have been used to prepare Tl2–xCdxMn2O7 (0x0.4) pyrochlore-like materials. The x = 0.2 compound has been characterized by neutron powder diffraction, magnetic, magnetotransport, and Hall measurements. This material is ferromagnetic below TC = 110 K. Both electrical resistance and magnetoresistance (MR) are enhanced with respect to stoichiometric Tl2Mn2O7, due to the drastic reduction in the number of carriers (electrons) induced by hole doping. MR(0.5 T) is higher than 106% at 120 K, and MR(9 T) is 30% at room temperature. We show that hole doped derivatives of Tl2Mn2O7 are promising candidates in which to search for large bulk magnetoresistance.The author are grateful for the financial support of CICyT (Project Nos. PB97-1181 and MAT99-1045).Peer reviewe

Caracterização molecular de microrganismos do ecossistema agrícola do cerrado. II. Colletotrichum graminicola.

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