735 research outputs found

    Monitoramento das atividades alimentares de Glyphepomis spinosa na cultura do arroz com o uso do EPG.

    Get PDF
    A espécie G. spinosa é exclusivamente neotropical, com ocorrência geográfica nos estados brasileiros de Goiás, Tocantins, Mato Grosso e São Paulo. Foi relatada danificando plantas de arroz em lavouras nos Estados de Goiás e Tocantins, sendo denominada como nova praga da cultura. A espécie tem ocorrência em arroz de terras altas e em campos inundados. Dada a importância de G. spinosa como potencial ?praga chave? para a cultura do arroz, o objetivo deste estudo, foi caracterizar o comportamento alimentar de G. spinosa em plantas de arroz

    Monitoramento das atividades alimentares de Tibraca limbativentris na cultura do arroz com o uso do EPG.

    Get PDF
    Os danos causados por Tibraca limbativentris podem ocorrer na fase vegetativa ou na fase reprodutiva e em condições de alta infestação os prejuízos causados pela praga podem chegar a até 90%. Entretanto, pouco é o conhecimento sobre o seu comportamento alimentar em plantas de arroz, requerendo mais estudos para entender o seu comportamento alimentar. O objetivo do trabalho foi monitorar o comportamento alimentar de T. limbativentris em plantas de arroz, por meio da técnica do EPG

    Identification of the major active ingredients in illegal pesticide seized by Brazilian Federal Police and quantification of metsulfuron-methyl and tebuconazole

    Get PDF
    A compilação de relatórios forenses de agrotóxicos, objetos de apreensões pela Polícia Federal no Brasil, mostrou que metsulfurom-metílico, imidacloprido, fipronil, tebuconazol, clorimurom-etílico e glifosato são os principais ingredientes ativos (IA) importados ilegalmente. Apesar destes IA não estarem entre os agrotóxicos mais comercializados no país, o alto preço das formulações correspondentes legalmente registradas pode estimular esta atividade ilegal. Com base neste estudo, amostras de agrotóxicos contrabandeados apreendidos contendo tebuconazol e metsulfurom-metílico foram analisadas quantitativamente utilizando cromatografia a gás e líquida, respectivamente. Tebuconazol, em apresentações líquidas e sólidas, apresentou concentrações concordantes com as informações dos rótulos, enquanto que a maioria das amostras de metsulfurom-metílico, rotuladas como 600 g kg-1, apresentaram concentrações mais baixas nas análises químicas (média de 337,0 g kg-1 + 2,0).The compilation of forensic reports from pesticides seized by the Federal Police in Brazil showed that metsulfuron-methyl, imidacloprid, fipronil, tebuconazole, clorimuron-ether and glyphosate were the dominant active ingredients (AI) illegally imported. Despite these AI were not among the most traded pesticides in Brazil, high prices of corresponding legal formulations may stimulate this illegal activity. Based on this study, smuggled pesticides containing tebuconazole and metsulfuron-methyl were seized and quantitatively analyzed using gas and liquid chromatography, respectively. Tebuconazole results, in liquid and solid presentations, were in accordance with the information on the label, while most metsulfuron-methyl samples, labeled as 600 g kg-1, showed lower concentrations in chemical analysis (mean of 337.0 g kg-1 + 2.0)

    The MuPix high voltage monolithic active pixel sensor for the Mu3e experiment

    Get PDF
    Mu3e is a novel experiment searching for charged lepton flavor violation in the rare decay μeee\mu\rightarrow eee. In order to reduce background by up to 16 orders of magnitude, decay vertex position, decay time and particle momenta have to be measured precisely. A pixel tracker based on 50mm thin high voltage monolithic active pixel sensors (HV-MAPS) in a magnetic field will deliver precise vertex and momentum information. Test beam results like an excellent efficiency of > 99:5% and a time resolution of better than 16.6 ns obtained with the MuPix HV-MAPS chip developed for the Mu3e pixel tracker are presented

    Feasibility studies of time-like proton electromagnetic form factors at PANDA at FAIR

    Get PDF
    Simulation results for future measurements of electromagnetic proton form factors at \PANDA (FAIR) within the PandaRoot software framework are reported. The statistical precision with which the proton form factors can be determined is estimated. The signal channel pˉpe+e\bar p p \to e^+ e^- is studied on the basis of two different but consistent procedures. The suppression of the main background channel, i.e.\textit{i.e.} pˉpπ+π\bar p p \to \pi^+ \pi^-, is studied. Furthermore, the background versus signal efficiency, statistical and systematical uncertainties on the extracted proton form factors are evaluated using two different procedures. The results are consistent with those of a previous simulation study using an older, simplified framework. However, a slightly better precision is achieved in the PandaRoot study in a large range of momentum transfer, assuming the nominal beam conditions and detector performance

    Observation of ηcωω\eta_c\to\omega\omega in J/ψγωωJ/\psi\to\gamma\omega\omega

    Get PDF
    Using a sample of (1310.6±7.0)×106(1310.6\pm7.0)\times10^6 J/ψJ/\psi events recorded with the BESIII detector at the symmetric electron positron collider BEPCII, we report the observation of the decay of the (11S0)(1^1 S_0) charmonium state ηc\eta_c into a pair of ω\omega mesons in the process J/ψγωωJ/\psi\to\gamma\omega\omega. The branching fraction is measured for the first time to be B(ηcωω)=(2.88±0.10±0.46±0.68)×103\mathcal{B}(\eta_c\to\omega\omega)= (2.88\pm0.10\pm0.46\pm0.68)\times10^{-3}, where the first uncertainty is statistical, the second systematic and the third is from the uncertainty of B(J/ψγηc)\mathcal{B}(J/\psi\to\gamma\eta_c). The mass and width of the ηc\eta_c are determined as M=(2985.9±0.7±2.1)M=(2985.9\pm0.7\pm2.1)\,MeV/c2c^2 and Γ=(33.8±1.6±4.1)\Gamma=(33.8\pm1.6\pm4.1)\,MeV.Comment: 13 pages, 6 figure
    corecore