2,353 research outputs found

    Seroprevalencia de leptospirosis en canes castrados por el Departamento de Zoonosis de la Municipalidad de Maipú, Mendoza

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    Leptospirosis es una zoonosis cosmopolita causada por la bacteria Leptospira (250 serovares). Produce infecciones asintomáticas hasta cuadros muy graves y mortales. Afecta distintas especies animales: perros, roedores, vacas, caballos y humanos. Se adquiere por contacto directo con fluídos y tejidos infectados o en forma indirecta por agua contaminada con orina infectada . Los animales son huéspedes primarios y reservorios de un serovar determinado. Identificar los reservorios animales de Leptospiras patógenas y su prevalencia es fundamental para la prevención de esta zoonosis. Los perros son un factor de riesgo en la transmisión de leptospirosis urbana debido a la estrecha relación en la dupla perro-hombre

    Constraints on the χ_(c1) versus χ_(c2) polarizations in proton-proton collisions at √s = 8 TeV

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    The polarizations of promptly produced χ_(c1) and χ_(c2) mesons are studied using data collected by the CMS experiment at the LHC, in proton-proton collisions at √s=8  TeV. The χ_c states are reconstructed via their radiative decays χ_c → J/ψγ, with the photons being measured through conversions to e⁺e⁻, which allows the two states to be well resolved. The polarizations are measured in the helicity frame, through the analysis of the χ_(c2) to χ_(c1) yield ratio as a function of the polar or azimuthal angle of the positive muon emitted in the J/ψ → μ⁺μ⁻ decay, in three bins of J/ψ transverse momentum. While no differences are seen between the two states in terms of azimuthal decay angle distributions, they are observed to have significantly different polar anisotropies. The measurement favors a scenario where at least one of the two states is strongly polarized along the helicity quantization axis, in agreement with nonrelativistic quantum chromodynamics predictions. This is the first measurement of significantly polarized quarkonia produced at high transverse momentum
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