132 research outputs found
Surto da doença de Newcastle, no Rio Grande do Sul, provocado por vacina contra o epitelioma contagioso das aves
An outbreak of Newcastle disease caused by a contamined vaccine against fowlpox is reported. The occurrence caused serious losses in flocks near Porto Alegre, State of Rio Grande do Sul. The farms which utilized the vaccine against fowlpox made by a private laboratory have had a complete destruction of their flocks. By means of appropiate tests it was possible to detect the NDV in a sample of the vaccine against fowlpox.Descreve-se um surto de doença de Newcastle em galinhas, provocado por vacina contaminada contra o epitelioma contagioso das aves, que causou graves perdas em granjas avÃcolas próximas a Porto Alegre; A vacina usada era procedente de laboratório situado em Estado onde existe a doença. O vÃrus da doença de Newcastle foi isolado diretamente da vacina contaminada, pela inoculação em ovos embrionados. A doença foi reproduzida experimentalmente pela vacinação por punção da membrana da asa e por escarificação da pele da coxa em lotes de frangos com 30 dias de idade, manifestando-se com o aparecimento de sintomas e lesões tÃpicas da doença de Newcastle. O vÃrus isolado mostrou-se patogênico para os embrionados provocando a morte dos embriões em 48 horas. Os testes sorológicos de hemaglutinação e inibição da hemaglutinação confirmaram o diagnóstico da doença. Este acidente de vacinação foi responsável pela introdução da doença de Newcastle Rio Estado do Rio Grande do Sul
The VLT-FLAMES Tarantula Survey I: Introduction and observational overview
The VLT-FLAMES Tarantula Survey (VFTS) is an ESO Large Programme that has
obtained multi-epoch optical spectroscopy of over 800 massive stars in the 30
Doradus region of the Large Magellanic Cloud (LMC). Here we introduce our
scientific motivations and give an overview of the survey targets, including
optical and near-infrared photometry and comprehensive details of the data
reduction. One of the principal objectives was to detect massive binary systems
via variations in their radial velocities, thus shaping the multi-epoch
observing strategy. Spectral classifications are given for the massive
emission-line stars observed by the survey, including the discovery of a new
Wolf-Rayet star (VFTS 682, classified as WN5h), 2' to the northeast of R136. To
illustrate the diversity of objects encompassed by the survey, we investigate
the spectral properties of sixteen targets identified by Gruendl & Chu from
Spitzer photometry as candidate young stellar objects or stars with notable
mid-infrared excesses. Detailed spectral classification and quantitative
analysis of the O- and B-type stars in the VFTS sample, paying particular
attention to the effects of rotational mixing and binarity, will be presented
in a series of future articles to address fundamental questions in both stellar
and cluster evolution.Comment: Accepted by A&A, 52 pages (main body: 19 pages, supplementary tables:
33 pages), v3: two classifications updated to match a parallel pape
Constraints on dark energy from H II starburst galaxy apparent magnitude versus redshift data
In this paper we use H II starburst galaxy apparent magnitude versus redshift
data from Siegel et al. (2005) to constrain dark energy cosmological model
parameters. These constraints are generally consistent with those derived using
other data sets, but are not as restrictive as the tightest currently available
constraints.Comment: 18 pages, 6 figures, 1 tabl
– Cardiodesfibrilador Implantável – Infecção em DCEI – Papel dos Fármacos AntiarrÃtmicos – Direção Veicular em Portadores de DCEI
Desde o primeiro implante, em 1980, até os dias atuais, ocorreram importantes avanços no cardiodesfibrilador implantável (CDI), tanto no tamanho como nas funções e programações. Atualmente esses dispositivos dispõem de terapia antitaquicardia (ATP), cardioversão com baixa energia, desfibrilação com alta energia e função antibradicardia de backup. Diversos estudos de grande porte demonstraram que o CDI trata efetivamente os eventos de taquicardia ventricular e fibrilação ventricular, reduzindo a mortalidade quando comparado com fármacos antiarrÃtmicos isoladamente.[...
– Terapia de Ressincronização CardÃaca
A insuficiência cardÃaca é uma significante causa de morbidade e mortalidade em todo o mundo, com prevalência de 2,4% dos adultos 1 (A). Embora a sobrevivência após o diagnóstico de insuficiência cardÃaca tenha melhorado nas duas últimas décadas, as taxas de morte e hospitalização por insuficiência cardÃaca permanecem altas e aproximadamente 50% dos pacientes morrem dentro de 5 anos do diagnóstico 1 (A). Adicionalmente, a despeito do tratamento medicamentoso otimizado, muitos pacientes com insuficiência cardÃaca permanecem sintomáticos e com redução da qualidade de vida 2 (D)
– Implante de Marcapasso nas Bradicardias e em Outras Situações Especiais – Estratificação de Risco de Morte Súbita na Cardiomiopatia Chagásica
A frequência cardÃaca normal varia de 60 bpm a 100 bpm. Ritmos com frequência cardÃaca < 60 bpm são definidos como bradicardia, que pode ser assintomática ou sintomática. As bradicardias sintomáticas têm caracterÃsticas clÃnicas comuns, marcadas, sobretudo, pela sÃndrome do baixo fluxo cerebral e/ou sistêmico, cujos sintomas mais comuns são tontura, pré-sÃncope, sÃncope, fadiga, dispneia de esforço e bradipsiquismo, sendo comumente ocasionadas por doença do nó sinusal e bloqueio atrioventricular. As assintomáticas, geralmente, são de causas fisiológicas, representadas por bradicardia sinusal e ritmos de escape da junção atrioventricular
Effects of Aging and Adult-Onset Hearing Loss on Cortical Auditory Regions
Hearing loss is a common feature in human aging. It has been argued that dysfunctions in central processing are important contributing factors to hearing loss during older age. Aging also has well documented consequences for neural structure and function, but it is not clear how these effects interact with those that arise as a consequence of hearing loss. This paper reviews the effects of aging and adult-onset hearing loss in the structure and function of cortical auditory regions. The evidence reviewed suggests that aging and hearing loss result in atrophy of cortical auditory regions and stronger engagement of networks involved in the detection of salient events, adaptive control and re-allocation of attention. These cortical mechanisms are engaged during listening in effortful conditions in normal hearing individuals. Therefore, as a consequence of aging and hearing loss, all listening becomes effortful and cognitive load is constantly high, reducing the amount of available cognitive resources. This constant effortful listening and reduced cognitive spare capacity could be what accelerates cognitive decline in older adults with hearing loss
Multitrophic Interaction in the Rhizosphere of Maize: Root Feeding of Western Corn Rootworm Larvae Alters the Microbial Community Composition
BACKGROUND: Larvae of the Western Corn Rootworm (WCR) feeding on maize roots cause heavy economical losses in the US and in Europe. New or adapted pest management strategies urgently require a better understanding of the multitrophic interaction in the rhizosphere. This study aimed to investigate the effect of WCR root feeding on the microbial communities colonizing the maize rhizosphere. METHODOLOGY/PRINCIPAL FINDINGS: In a greenhouse experiment, maize lines KWS13, KWS14, KWS15 and MON88017 were grown in three different soil types in presence and in absence of WCR larvae. Bacterial and fungal community structures were analyzed by denaturing gradient gel electrophoresis (DGGE) of the 16S rRNA gene and ITS fragments, PCR amplified from the total rhizosphere community DNA. DGGE bands with increased intensity were excised from the gel, cloned and sequenced in order to identify specific bacteria responding to WCR larval feeding. DGGE fingerprints showed that the soil type and the maize line influenced the fungal and bacterial communities inhabiting the maize rhizosphere. WCR larval feeding affected the rhiyosphere microbial populations in a soil type and maize line dependent manner. DGGE band sequencing revealed an increased abundance of Acinetobacter calcoaceticus in the rhizosphere of several maize lines in all soil types upon WCR larval feeding. CONCLUSION/SIGNIFICANCE: The effects of both rhizosphere and WCR larval feeding seemed to be stronger on bacterial communities than on fungi. Bacterial and fungal community shifts in response to larval feeding were most likely due to changes of root exudation patterns. The increased abundance of A. calcoaceticus suggested that phenolic compounds were released upon WCR wounding
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