10,098 research outputs found
Study of psi' and chi_c decays as feed-down sources of J/psi hadro-production
The interpretation of the J/psi suppression patterns observed in nuclear
collisions, at CERN and RHIC, as a signature of the formation of a deconfined
phase of QCD matter, requires knowing which fractions of the measured J/psi
yields, in pp collisions, are due to decays of heavier charmonium states. From
a detailed analysis of the available mid-rapidity charmonium hadro-production
cross sections, or their ratios, we determine that the J/psi feed-down
contributions from psi' and chi_c decays are, respectively, (8.1 +/- 0.3) % and
(25 +/- 5) %. These proton-proton values are derived from global averages of
the proton-nucleus measurements, assuming that the charmonium states are
exponentially absorbed with the length of matter they traverse in the nuclear
targets.Comment: 12 pages, 4 figures, 3 table
Cartilha - palestra sobre ferrugem asiática da soja.
Esta palestra trata de aspectos da ferrugem asiática da soja: uma doença recente no Brasil e com alto potencial de dano.bitstream/item/56144/1/ID-26146.pd
Caracterização das explorações de ovinos Serra da Estrela
A raça ovina serra da estrela tem o seu solar ao largo da nascente da bacia
hidrográfica do rio Mondego. Com um efectivo actual de cerca de 90000 cabeças e
encabeçamento de 35,8, esta raça autóctone de vocação predominantemente
leiteira, apresenta na rusticidade, uma característica fundamental para a sua
adaptação ao sistema semi-extensivo em que é explorada.
A alimentação é feita à base de pastagens naturais e melhoradas, forragens e
concentrados apenas durante o alavão.
Nos ovis predominam as construções próprias para o efeito, utilizando tanto o
sistema de camas de mato ou palha, como o ripado.
As condições higiosanitárias da maioria das explorações são ainda muito deficitárias
quer ao nível da qualidade das estruturas quer ao nível do maneio dos animais.
Aquando da selecção das explorações foram tomados em conta, entre outros,
critérios como a dimensão do efectivo, a indemnidade em relação à Brucelose, o tipo
de maneio, bem como a existência de suspeita clínica
O sobredimensionamento das explorações, a não existência de maternidades e
parques de recria, comedouros e bebedouros mal dimensionados, a ausência de
instalações para isolamento de animais doentes ou suspeitos, foram também
identificados como factores predisponentes ao aparecimento e manutenção nas
explorações de doenças com características epidemiológicas semelhantes à
paratuberculose.
O exame clínico de alguns animais destas explorações revelou a existência de
animais com acentuadas quebras de produção, emagrecimento progressivo, diarreia
terminal e edema intermandibular, compatíveis com um quadro sintomático de
Paratuberculose ovina.Agradecimentos: Ao Projecto Agro 786, Medida 8. Desenvolvimento Tecnológico e Demonstração. Acção 8.1-Desenvolvimento Experimental e Demonstração, bem como a todas as entidades nele interveniente
Heavy-ion Physics at a Fixed-Target Experiment Using the LHC Proton and Lead Beams (AFTER@LHC): Feasibility Studies for Quarkonium and Drell-Yan Production
We outline the case for heavy-ion-physics studies using the multi-TeV lead
LHC beams in the fixed-target mode. After a brief contextual reminder, we
detail the possible contributions of AFTER@LHC to heavy-ion physics with a
specific emphasis on quarkonia. We then present performance simulations for a
selection of observables. These show that , and
production in heavy-ion collisions can be studied in new energy and
rapidity domains with the LHCb and ALICE detectors. We also discuss the
relevance to analyse the Drell-Yan pair production in asymmetric
nucleus-nucleus collisions to study the factorisation of the nuclear
modification of partonic densities and of further quarkonia to restore their
status of golden probes of the quark-gluon plasma formation.Comment: 18 pages, 7 figure
Arl13b interferes with α-tubulin acetylation
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First report of a linezolid-resistant MRSA (methicillin resistant Staphylococcus aureus) isolated from a dog with a severe bilateral otitis in Portugal
The widespread use of antimicrobials has lead to the emergence of resistant bacteria to one or more antibiotic, including new drugs like linezolid. This antimicrobial is the first of the oxazolidinone group and soon after its approval in 2000, linezolid-resistant MRSA and linezolid vancomycin-resistant enterococci have emerged. Several outbreaks of linezolid-resistant MRSA have been reported worldwide but, to our knowledge, this is the first report of a linezolid-resistant MRSA isolated from a dog in Portugal. The animal arrived at the Teaching Hospital of the Faculty of Veterinary Medicine, Technical University of Lisboa with a severe bilateral otitis that was refractory to antibiotic therapy. Bacteriology showed that the infection was caused by a multiresistant Staphylococcus aureus strain that also phenotipically expressed other virulence factors. Besides the challenge to practitioners, the isolation of this strain is of public health concern due to its antimicrobial resistant profile.
A Expressão Global da Doença de Chagas – Oportunidades Emergentes e Impacto em Portugal
Chagas disease, caused by the protozoan Trypanosoma cruzi is endemic in the countries of Central and South America. Despite vector control programs and other measures taken in the blood banks and maternity hospitals, it is estimated that there are about eight million people infected worldwide. Although traditionally associated with rural life and poverty, the current migration flows transform it into a global public health problem. In Portugal, this problem is poorly known, with an estimated underdiagnosis index that exceeds 99%. In European countries, besides imported cases, autochthonous infections arise through vertical transmission and blood/organ donation.The conventional serological tests for diagnosing Chagas disease and verifying its cure are indirect hemagglutination (IHA), indirect immunofluorescence (IFAT), and enzyme-linked immunoabsorbent assay (ELISA).The hypothesis of autoimmunity as a basic mechanism of this disease and the absence of early markers of cure are the causes of controversy regarding the specific treatment of this disease. The currently available drugs have adverse effects on a large number of patients and parasitological efficacy in chronic disease is suboptimal.The authors reinforce the need of a high level of suspicion in patients with suggestive epidemiology and the need of populational screening of specific high risk groups
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