Relativistic quantum dynamics of scalar bosons under a full vector Coulomb interaction

The relativistic quantum dynamics of scalar bosons in the background of a full vector coupling (minimal plus nonminimal vector couplings) is explored in the context of the Duffin-Kemmer-Petiau formalism. The Coulomb phase shift is determined for a general mixing of couplings and it is shown that the space component of the nonminimal coupling is a {\it sine qua non} condition for the exact closed-form scattering amplitude. It follows that the Rutherford cross section vanishes in the absence of the time component of the minimal coupling. Bound-state solutions obtained from the poles of the partial scattering amplitude show that the time component of the minimal coupling plays an essential role. The bound-state solutions depend on the nonminimal coupling and the spectrum consists of particles or antiparticles depending on the sign of the time component of the minimal coupling without chance for pair production even in the presence of strong couplings. It is also shown that an accidental degeneracy appears for a particular mixing of couplings.Comment: 8 pages, 1 table. arXiv admin note: text overlap with arXiv:1403.603

Gestão da propriedade intelectual como suporte à inovação tecnológica: o caso do núcleo de inovação tecnológica da Universidade Federal de Viçosa

O artigo procurou investigar como a Universidade Federal de Viçosa (UFV) tem gerido a sua propriedade intelectual (PI) por meio da atuação da Comissão Permanente de Propriedade Intelectual (CPPI), seu Núcleo de Inovação Tecnológica (NIT). Neste sentido, dois objetivos foram definidos: (i) caracterizar a formalização e a gestão da PI da UFV, realizada pela CPPI, e (ii) evidenciar a atuação da CPPI em prol da gestão da PI. O estudo demonstrou que a UFV possui um NIT consolidado e que é referência em Minas Gerais, devido às suas competências e à coordenação da Rede Mineira de Propriedade Intelectual.The article sought to investigate how the Universidade Federal de Viçosa (UFV) has managed its intellectual property (IP) through the work of the Standing Commission on Intellectual Property (CPPI), technology transfer offices (TTO). In this sense, two objectives were defined: (i) to characterize the formalization and IP management of UFV held by CPPI and (ii) demonstrate the performance of the CPPI towards the management of IP. The study showed that UFV has a consolidated TTO and that is reference in Minas Gerais State, Brazil, due to their expertise and coordinating Intellectual Property Association of Minas Gerais

COOPERATION FOR TECHNOLOGICAL DEVELOPMENT: AN ANALYSIS IN THE CONTEXT OF FEDERAL UNIVERSITIES OF MINAS GERAIS STATE

The open innovation concept emerges as a substantial factor to innovation management of organizations. Given the importance of universities to the innovation system, they also have adapted to this new paradigm. The objective was to identify the main partners of federal universities of Minas Gerais state - Brazil about the technological development. Characterized as qualitative and descriptive, the research was based on secondary data collected in the INPI patent database through the CNPJ of the 11 federal universities. Thus, was evidenced that the interactions carried out by federal universities analyzed are an important way of corroborating for technological development

Cursos, cursinhos e ensino jurídico no Brasil

O presente artigo busca diagnosticar o quadro da educação jurídica contemporânea, considerando a relação entre o Direito e seu ensino. Para tanto, será analisada a relação entre os campos jurídico, político e econômico, bem como a interação entre Estado e Mercado. Ao final, refletir-se-á acerca do lugar das disciplinas propedêuticas no contexto do ensino do Direito no Brasil

Time resolved emission spectroscopy of poly(2,5-dicyano-p-phenylene-vinylene) films

Films of poly (2,5-dicyano-p-phenylene vinylene), DCNPPV, were obtained by electrochemical synthesis over gold thin layer (20 nm) transparent electrode deposited on a glass plate. The DCNPPV films of 4 µm thickness were produced by electropolymerization process of α,α,α',α'-tetrabromo-2-5-dicyano-p-xilene at different applied potentials (-0.15, -0.25, -0.40, -0.60, -0.80, and -1.0 V) using 0.1 mol L-1 of tetraethylammonium bromide in acetonitrile as the supporting electrolyte. The emission decays have three exponential components: a fast component in the picosecond range (200-400 ps), and two other of about one and five nanoseconds at 293 K. The fluorescence quenching process seems to occur by exciton trapping in a low-energy site and quenching by residual bromine monomer attached at the end of the polymer chain. However, the electrochemical synthesis generates entrapped bromide or ion pairs during the growth step of the film which also contributes to the deactivation. The change of the electrolyte from bromide to perchlorate reduces significantly this additional quenching effect by allowing ion exchange of formed bromide with the nonquenching perchloride anion.Filmes finos de poli(2,5-diciano-p-fenileno vinileno), DCNPPV, foram produzidos por síntese eletroquímica com variação do potencial aplicado de-0,15 até-1,0 V, e depositados sobre camada fina de ouro sobre vidro. A cinética de estado excitado destes materiais foi investigada por medidas de decaimentos de fluorescência. Os filmes apresentam decaimentos com três componentes, uma rápida da ordem de 200-400 picossegundos, e outra duas componentes de aproximadamente um e cinco nanossegundos, na temperatura de 293 K. O decaimento de fluorescência ocorre pela desativação em sítios de baixa energia na cadeia polimérica conjugada e por supressão do estado excitado por monômeros bromados terminais da cadeia e íons brometo aprisionados durante o crescimento eletroquímico do filme. A mudança do ânion do eletrólito suporte de brometo para perclorato reduziu de modo significativo essa contribuição de supressão do estado excitado como resultado da troca iônica por uma espécie não supressora.FAPESPCNP

Perfil morfológico, maturacional, funcional e técnico de jovens futebolistas Brasileiro

The objectives of this study were to describe and compare the anthropometric profile, physical fitness and soccer-specific skills between under-15 and under-17 Brazilian soccer players, as well as to evaluate possible differences in these variables according to biological maturation in the age categories. The sample consisted of 245 male soccer players (under-15: n=161; under-17: n=84). Anthropometric measures included weight, height and skinfolds. Biological maturation was assessed based on pubic hair development. The following tests were used for functional assessment: static and countermovement jump, Yo-Yo intermittent endurance test (level 2), RAST, 5- and 30-meter running speed, and agility T-test. Soccer-specific skills were assessed using three tests: ball control, dribbling, and kick accuracy. Descriptive statistics, t-test and analysis of variance (ANOVA) were used for statistical analysis. The results showed a larger body size (stature and body mass), longer sports experience (years of formal training) and better performance in most of the functional tests for under-17 soccer players compared to under-15 players. There were no significant differences in adiposity or soccer-specific skills between levels of competition. Significant differences as a function of maturation stage were observed in anthropometric and functional variables only in the under-15 category. In conclusion, the under-17 category differs from the under-15 category in terms of anthropometric and physical fitness characteristics. However, no difference was observed in two of the three soccer-specific skills. Physical fitness components and soccer-specific skills were associated with maturity only in the under-15 category.Foram objetivos deste estudo caracterizar e comparar o perfil antropométrico, funcional e das habilidades motoras específicas (HME) de jovens futebolistas Brasileiros brasileiros sub-15 e sub-17, assim como verificar possíveis diferenças nas variáveis referenciadas em função da maturação biológica nas categorias etárias. O efetivo da amostra foi constituído por 245 futebolistas do sexo masculino (sub-15, n=161; sub-17, n=84). As medidas antropométricas incluíram a massa corporal, a estatura e as dobras cutâneas. A maturação biológica foi acedida através do desenvolvimento da pilosidade púbica. O desempenho funcional foi realizado através dos testes: salto estático e com contra-movimento, Yo-Yo intermittent endurance test (nível 2), RAST, velocidade de 5 e 30 metros e teste T de agilidade. Nas HME recorreu-se a três testes: controle da bola, condução da bola e precisão de chute. Na análise dos dados para além da estatística descritiva foi utilizado o teste t de medidas independentes e a análise da variância de medidas independentes (ANOVA). Os resultados indicaram que os futebolistas sub-17 são mais altos e pesados e apresentam um desempenho superior na generalidade das provas funcionais. Adiposidade e duas das três HME não mostraram diferenças significativas em função da categoria. Foram observadas diferenças significativas em função do estágio maturacional apenas nos sub-15 em variáveis antropométricas e funcionais. Em conclusão, os futebolistas sub-17 diferem dos sub-15 nas características antropométricas e capacidades funcionais. No entanto as HME parecem não ser sensíveis à influência da idade

Trihexyphenidyl: characterization of its abusive consumption by a group of users in the city of São Paulo

The abuse of anticholinergic drugs to induce mental alterations as hallucinations and delirium is widely known. Trihexyphenidyl (Artane®), among these drugs, seems to be the most abused. In Brazil, its use has been already observed among psychotic patients, first and second grade students, street children and crack-cocaine addicts. Faced to the lack of Brazilian reports describing such inadequate use of trihexyphenidyl, this study was conducted to characterize recreacional use as well as reasons that justify the misuse. Adopting qualitative methodology and a Purposeful Sampling achieved by a Criterion Sampling (21 users and 16 ex-users), it was observed predominance of single poliusers men, without employment bonds, who abused of trihexyphenidyl in the attainment of mental alterations, mainly hallucinations and deliriums. Trihexyphenidyl is consumed in association with alcohol, other licit drugs (BDZ) and illicit drugs, impairing cognitive functions as memory, attention and learning, intervening with some activities of users' daily life. Reported as an easy access medicine, with low-cost and resulting in drastic effects in the life of the user, these results pointed to the necessity of more effective measures in its release, beyond the necessity of adoption of prevention measures to avoid its abuse.O abuso de drogas anticolinérgicas na indução de estados mentais alterados, como alucinações e delírios, é amplamente conhecido. Entre essas, a triexifenidila (TEF) (Artane®) parece ser a mais abusada. No Brasil, seu consumo já foi observado entre pacientes psicóticos, estudantes de 1º e 2º graus da rede pública, meninos de rua e usuários de crack. Diante da carência de relatos brasileiros que retratassem o consumo inadequado da triexifenidila, esse estudo foi conduzido para caracterizar a população usuária e as razões subjacentes ao seu abuso. Utilizando-se de metodologia qualitativa e amostra intencional selecionada por critérios (21 usuários e 16 ex-usuários), observou-se a predominância de homens solteiros, poliusuários e sem vínculos empregatícios, que relataram o abuso da droga na obtenção, principalmente, de alucinações e delírios. A TEF, consumida em associação a álcool, outras drogas lícitas (BZD) e ilícitas, interfere nas funções cognitivas, como memória, atenção e aprendizado, prejudicando os usuários no desempenho de muitas de suas atividades cotidianas. Por ser relatada como medicamento de fácil acesso, baixo custo e com efeitos drásticos na vida do usuário, os resultados apontam para a necessidade de medidas mais efetivas em sua liberação, além da necessidade de adoção de medidas preventivas para que seu abuso seja evitado.Universidade Federal de São Paulo (UNIFESP) Departamento de PsicobiologiaCentro Brasileiro de Informações sobre Drogas Psicotrópicas (CEBRID)UNIFESP Departamento de PsicobiologiaCEBRIDUNIFESP, Depto. de PsicobiologiaUNIFESP, Depto. de PsicobiologiaSciEL

Potential of Bacillus thuringiensis israelensis Berliner for controlling Aedes aegypti

Relata-se a importância da bactéria entomopatogênica Bacillus thuringiensis israelensis para o controle de Aedes aegypti. São abordados a utilização e potencial de B. thuringiensis israelensis contra o mosquito vetor da dengue. Outros aspectos são discutidos como a evolução da resistência dos insetos em relação aos inseticidas químicos e as vantagens e desvantagens do controle microbiano como estratégia de controle. É dada ênfase à importância da utilização desta bactéria no Brasil como alternativa para resolver o problema em questão sem afetar o ambiente, o homem e outros vertebrados nas áreas de risco.The importance of the entomopathogenic bacterium Bacillus thuringiensis israelensis in the control of Aedes aegypti is presented. The use and potential of B. thuringiensis israelensis against the mosquito vector of dengue fever is described. Other aspects such as insect's resistance development against chemicals and advantages and constraints of using microbial control are discussed. Emphasis is given to the importance of the use of this bacterium in Brazil, which could contribute significantly to solving the mosquito problem without affecting the environment, humans and others invertebrate organisms in critical regions

Understanding Cassiopea andromeda (Scyphozoa) Invasiveness in Different Habitats: A Multiple Biomarker Comparison

A dual nutrition mode (i.e., mixotrophy) can be advantageous for alien species in a new environment. In Ceara (Brazil), the symbiotic jellyfish Cassiopea andromeda is rapidly spreading under diverse environmental conditions across natural and human-altered coastal habitats, such as mangroves and shrimp farms. Here we report on the trophic ecology of the alien upside-down jellyfish sampled in these two contrasting coastal habitats during the dry (July-October) and rainy (January-April) seasons, investigated by means of organic biomarkers (lipids, carbohydrates) and bulk tissue stable isotope (& delta;N-15 and & delta;C-13) analyses. Total lipid content of jellyfish gonads was generally higher in shrimp farms, whereas no significant difference in carbohydrate concentration was found in jellyfish tissues from the two different habitats. Similarly, there were no significant differences in the & delta;N-15 values of jellyfish tissues from the two contrasting habitats, whereas the & delta;C-13 values were higher in jellyfish from shrimp farms. Overall, the higher carbon-enriched value in aquaculture ponds supports the hypothesis of differences of available food sources compared to the natural mangrove habitats, where food availability exhibits a stronger seasonality. In fact, aquaculture ponds are characterized by human-driven regular food supply, leading to more stable trophic conditions and to enhanced growth, lipid production, and gonadal output of C. andromeda jellyfish. This investigation may contribute to predicting how Cassiopea mixotrophy may contribute to explaining its differential success in different habitats

Copepod Assemblages at the Base of Mangrove Food Webs during a Severe Drought

The effect of severe drought on the functional groups that sustain the base of the mangrove food webs in semi-arid areas is largely unknown. We therefore analyzed the intra-annual variation in the assemblages and functional groups of copepods in a shallow, low-inflow estuary of the Brazilian semi-arid coast when the most severe drought ever occurred. The lowest density was found in April (upstream region) and the highest in August (downstream region). Three main functional groups were identified, sorted by spawning strategy, and further subdivided according to feeding strategy, trophic regime, and diel vertical migration behavior. The community was significantly influenced by the extreme drought period, presenting a temporal homogenization in terms of composition, and an expressive and unexpected increase in density in the dry period, possibly due to phytoplankton blooms resistant to hypersalinity and the occurrence of copepod species adapted to stressful conditions. The few stress-tolerant species sustaining the food webs with seasonal variations were observed simplifying the trophic variability. The results indicate that hypersalinity can induce changes in the zooplankton community, increasing copepod mortality risk and, so, promoting alteration in the trophic estuarine dynami