7,762 research outputs found

    Distribuição, coleta, uso e preservação das espécies silvestres de algodão no Brasil.

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    bitstream/CNPA/14839/1/DOC78.pd

    Embrapa algodão - tecnologia de impacto e principais desafios-2001 a 2003.

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    bitstream/CNPA-2009-09/14613/1/DOC73.pd

    Alguns insetos úteis ao algodoeiro.

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    bitstream/item/126637/1/Alguns-Insetos-uteis-ao-algoodoeiro.pd

    Chandra X-Ray Observations of Nineteen Millisecond Pulsars in the Globular Cluster 47 Tucanae

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    We present spectral and long-timescale variability analyses of \textit{Chandra} ACIS-S observations of the 19 millisecond pulsars (MSPs) with precisely known positions in the globular cluster 47 Tucanae. The X-ray emission of the majority of these MSPs is well described by a thermal (blackbody or neutron star hydrogen atmosphere) spectrum with a temperature Teff(13)×106T_{\rm eff}\sim(1-3)\times10^6 K, emission radius Reff0.13R_{\rm eff}\sim0.1-3 km, and luminosity LX103031L_{X}\sim10^{30-31} ergs s1^{-1}. For several MSPs, there is indication that a second thermal component is required, similar to what is seen in some nearby field MSPs. The radio-eclipsing binary MSPs 47 Tuc J, O, and W show a significant non-thermal component, with photon index Γ11.5\Gamma\sim 1-1.5, which may originate in an shock formed due to interaction between the relativistic pulsar wind and matter from the stellar companion. We re-examine the X-ray--spindown luminosity relation (LXE˙L_{X}-\dot{E}) and find that due to the large uncertainties in both parameters the result is consistent with both the linear LXE˙L_{X}-\dot{E} relation and the flatter LXE˙0.5L_X\propto\dot{E}^{0.5} predicted by polar cap heating models. In terms of X-ray properties, we find no clear systematic differences between MSPs in globular clusters and in the field of the Galaxy.Comment: 13 pages, 6 figures, accepted for publication in the Astrophysical Journa

    A pesquisa algodoeira no nordeste do Brasil.

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    Caracterizacao da producao de algodao na regiao setentrional do Brasil; Contribuicao da pesquisa e iniciativa privada a problematica do algodao do nordeste no passado; Desafios atuais; Acoes recentes da pesquisa com o algodao no nordeste; Sugestoes finais.bitstream/item/33264/1/A-PESQUISA-ALGODOEIRA.pd

    Distribuição dos algodoeiros no nordeste do Brasil.

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    Zoneamento do nordeste para a cultura algodoeira.bitstream/item/33345/1/DISTRIBUICAO-DOS-ALGODOEIROS.pd

    Cultura do gergelim (sesamum indicum L.) no nordeste do Brasil.

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    Informacos gerais; Sistema de cultivo.bitstream/item/33339/1/CULTURA-DO-GERGELIM.pd

    Are patients with panic disorder respiratory subtype more vulnerable to tobacco, alcohol or illicit drug use?

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    CONTEXTO: Estudos anteriores têm mostrado associações entre o transtorno de pânico (TP) e o uso de tabaco, álcool e substâncias ilícitas. É conhecido que transtornos de uso de substâncias interferem negativamente no prognóstico de transtornos de ansiedade e depressão. No subtipo respiratório (SR) do TP há mais história familiar de TP e maior risco de comorbidades com transtornos de ansiedade. OBJETIVOS: Descrever os padrões de uso de tabaco, álcool e outras substâncias em pacientes com TP. Além disso, analisar se pacientes do SR usam mais essas substâncias do que os pacientes do subtipo não respiratório. MÉTODOS: Esse foi um estudo transversal com 71 pacientes com TP. As escalas Alcohol Use Disorders Identification Test e Fagerstrom Tobacco Questionnaire foram aplicadas. Pacientes com quatro ou cinco sintomas respiratórios foram considerados no SR, e os demais pacientes foram considerados como do subtipo não respiratório. RESULTADOS: Na amostra estudada, 31,0% dos pacientes eram fumantes, 11,3% faziam uso perigoso de álcool e nenhum fazia uso de substâncias ilícitas. Não houve diferença entre os subtipos respiratório e não respiratório em relação a tabagismo, uso de álcool, cannabis, cocaína, estimulantes e alucinógenos. CONCLUSÃO: O SR não foi correlacionado com o uso de tabaco, álcool ou drogas ilícitas. Mais estudos clínicos e epidemiológicos focando a relação entre o TP e uso de substâncias são necessários.BACKGROUND: Studies have documented high use of tobacco, alcohol and illicit drugs in patients with panic disorder (PD). The comorbid substance use disorders worsen the prognosis of mood and anxiety disorders. The respiratory subtype (RS) of PD seems to represent a more severe and distinct form of this disorder associated with higher familial history of PD and more comorbidity with other anxiety disorders. OBJECTIVES: Describe the patterns of tobacco, alcohol or illicit drug use in PD patients, and also to ascertain if patients with the RS use these substances more than those of the non-respiratory subtype. METHODS: This is a cross-sectional study with 71 PD patients. The Alcohol Use Disorders Identification Test and Fagerstrom Tobacco Questionnaire were used in the evaluation. Patients with four or five respiratory symptoms were classified in the RS, the remaining patients were classified as non-respiratory subtype. RESULTS: In our sample 31.0% were smokers, 11.3% were hazardous alcohol users and none of them was using illicit drugs. There were no differences between the respiratory and non-respiratory subtypes regarding the use of tobacco, alcohol, cannabis, cocaine, stimulants and hallucinogens. DISCUSSION: The RS was not correlated to the use of tobacco, alcohol and illicit drugs. Additional epidemiological and clinical studies focusing the relationship between PD and substance use are warranted
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