Viabilidade do uso da previsão no controle da requeima (Phytophthora infestans) em batata nas regiões de Pelotas e São Lourenço do Sul - RS.

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Análise de um sistema agroflorestal usando estatística multivariada.

Os cultivos consorciados onde são cultivados no mesmo espaço, de forma simultânea ou seqüencial, culturas anuais e/ou fruteiras com espécies florestais, com a presença ou não de animais, receberam a denominação específica de sistemas agroflorestais, ou simplesmente, s SAF' . Nas regiões tropicais, parece óbvio as vantagens desses sistemas em relação às outras formas de cultivo, principalmente no que tange a sua sustentabilidade a longo prazo. Não obstante, as análises quantitativas dos efeitos diretos das culturas componentes dos s SAF' , bem como das associações existentes entre essas culturas, são fundamentais para uma melhor compreensão e sistematização desses sistemas de cultivo. Entre os componentes dos s SAF' , há interações biológicas, econômicas e ambientais, entre outras, o que torna complexo as análises e interpretações dos mesmos

Spin-1/2 "bosons" with mass dimension 3/2 and fermions with mass dimension 1 cannot represent physical particle states

We delve into the first principles of quantum field theory to prove that the so-called spin-1/2 "bosons" and the fermions with mass dimension 1, including ELKO, cannot represent physical particle states with spin 1/2. Specifically, we first demonstrate that both aforementioned fields are not invariant under rotational symmetry, which implies that the particles created for these fields are not eigenstates of the spin operator in the (1/2, 0) circle plus (0, 1/2) representation of the Lorentz group, nor is it possible to construct a Hamiltonian density scalar under the rotational group from them. Furthermore, following Weinberg's approach to local causal fields, we prove that regardless of any discrete symmetry or adjoint structure, the relativistic fields in the (1/2, 0) circle plus (0, 1/2) representation satisfy the Fermi-Dirac statistics in complete agreement with the well-established spin-statistics theorem and experimental results.Peer reviewe

Reinstatement of Morphine-Induced Conditioned Place Preference in Mice by Priming Injections

To construct a model of relapse of drug abuse in mice, the induction, we evaluated the extinction and reinstatement of morphine-induced place preference. In Experiment 1, we examined the effects of morphine (0, 2, 3, 5, 10, 20 and 40 mg/kg) in the conditioned place preference (CPP) paradigm. Mice showed CPP with 5, 10, 20 and 40 mg/kg. In Experiment 2, we evaluated the effects of two different extinction procedures. After conditioning with 40 mg/kg of morphine, the mice underwent daily extinction sessions of 60 or 15 min of duration. CPP was extinguished after seven and nine sessions, respectively. In Experiment 3, we tested the reinstating effects of several priming doses of morphine. Mice were conditioned with 40 mg/kg of morphine and underwent the daily 15 min extinction sessions until CPP was no longer evident. Then, the effects of morphine (0, 2, 3, 5, 10, 20, 40 mg/kg, i.p.) were evaluated. CPP was reinstated by doses from 5 mg/kg upward. The results show that morphine priming injections are effective in reactivating opiateseeking behavior in mice, and thus, the CPP paradigm might be useful to investigate the mechanisms underlying relapse of drug abuse

Pesca em águas interiores na ilha de S. Miguel (Açores)

XII congresso da Associação Espanhola de Limnologia/IV Congresso Ibérico de Limnologia, organizado pela Associação Espanhola de Limnologia, de 5 a 9 de Julho de 2004 no Porto, Portugal.A ilha de S. Miguel é dotada de lagoas e ribeiras abundantes em espécies piscícolas que levaram ao desenvolvimento da pesca desportiva. Todas as espécies existentes nas lagoas foram introduzidas por acção humana

Resposta da videira BRS morena sob cobertura plástica a diferentes sistemas de alerta fitossanitário.

O objetivo deste estudo foi avaliar o efeito do uso de diferentes sistemas de alerta fitossanitário para o controle do míldio na videira cv BRS Morena cultivada sob cobertura plástica impermeável.Resumo expandido

Comparison of CDMS [100] and [111] oriented germanium detectors

The Cryogenic Dark Matter Search (CDMS) utilizes large mass, 3" diameter $\times$ 1" thick target masses as particle detectors. The target is instrumented with both phonon and ionization sensors and comparison of energy in each channel provides event-by-event classification of electron and nuclear recoils. Fiducial volume is determined by the ability to obtain good phonon and ionization signal at a particular location. Due to electronic band structure in germanium, electron mass is described by an anisotropic tensor with heavy mass aligned along the symmetry axis defined by the [111] Miller index (L valley), resulting in large lateral component to the transport. The spatial distribution of electrons varies significantly for detectors which have their longitudinal axis orientations described by either the [100] or [111] Miller indices. Electric fields with large fringing component at high detector radius also affect the spatial distribution of electrons and holes. Both effects are studied in a 3 dimensional Monte Carlo and the impact on fiducial volume is discussed.Comment: Low Temperature Detector 14 conference proceedings to be published in the Journal of Low Temperature Physic