Ocorrência de patógenos causadores de mastite subclínica no município de Jaguapitã, estado do Paraná - Brasil

O objetivo desta pesquisa foi identificar a ocorrência dos patógenos causadores de mastite subclínica em um rebanho leiteiro tipo B no município de Jaguapitã, estado do Paraná, Brasil. Foram realizados 400 testes de Califórnia Mastite Teste (CMT) em amostras de leite de 100 animais, totalizando 400 tetos. Dentre os animais testados 55% reagiram ao CMT apresentando grau dois ou superior, com 157 tetos positivos. Após as amostras de leite dos 157 tetos serem submetidos à cultura em ágar sangue, 25,48% (40/157) não apresentaram crescimento ou houve crescimento de mais de duas colônias bacterianas, 28,03% (44/157) foram observadas Staphylococcus coagulase negativa (CNS), 8,28% (13/157) Streptococcus uberis, 7,64% (12/157) Staphylococcus aureus, 7,64% (12/157) Corynebacterium spp, 7,01% (11/157) Staphylococcus intermedius, 4,46% (7/157) Staphylococcus hyicus, 3,82% (6/157) Bacillus spp., 2,55% (4/157) para Streptococcus dysgalacteae, Enterobactéria e Leveduras. Conclui-se que a CNS é o mais relevante agente causador de mastite subclínica.</p

Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements