RESUMO
The cross section of the process e^{+}e^{-}âπ^{+}π^{-} has been measured in the center-of-mass energy range from 0.32 to 1.2 GeV with the CMD-3 detector at the electron-positron collider VEPP-2000. The measurement is based on an integrated luminosity of about 88 pb^{-1}, of which 62 pb^{-1} represent a complete dataset collected by CMD-3 at center-of-mass energies below 1 GeV. In the dominant region near the ρ resonance a systematic uncertainty of 0.7% was achieved. The implications of the presented results for the evaluation of the hadronic contribution to the anomalous magnetic moment of the muon are discussed.
RESUMO
Reactions to tuberculin in cows from a healthy herd were ascertained to be caused by Mycobacterium tuberculosis as latent tuberculous infection was detected in 10.4% of cattle-breeders, including milkmaids looking after infected cows and having a family contact with patients with open-type tuberculosis. In tuberculin-positive cows, the level of antibodies to M. tuberculosis was higher than that of antibodies to M. bovis; mycobacterial antigens and their complexes with antibodies circulated in blood; the investigators isolated mycobacteria with the greatly changed morphology and cultural properties, which were referred to as an M. tuberculosis-M. bovis complex in their antigenic composition and specific DNA sites. Alongside with the traditional diagnostic methods for tuberculosis, the authors underline the need for using enzyme immunoassay, polymerase chain reaction, blood and sputum tests using the VKC medium.
Assuntos
Imunidade/imunologia , Mycobacterium bovis/imunologia , Doenças Profissionais/imunologia , Tuberculina/imunologia , Tuberculose Bovina/imunologia , Animais , Bovinos , Feminino , Humanos , Incidência , Masculino , Doenças Profissionais/epidemiologia , Doenças Profissionais/microbiologia , República de Belarus/epidemiologia , Fatores de Risco , Tuberculose Bovina/microbiologia , Tuberculose Bovina/transmissão , ZoonosesRESUMO
Incubation by means of the growth-promoting factor VCG of autoclaved culture broth of M. bovis 8 and tuberculins on the nutrient medium VCG gave rise to microorganisms that could partially restore acid resistance. The isolates reacted with antiserum to M. bovis Vallee in the agglutination test and enzyme immunoassay, which in combination with polymerase chain reaction data verifies their genetic relationship with the pathogen of tuberculosis. The isolates did not show a significant pathogenicity, but they long persisted in guinea-pigs and, in some cases, induced delayed hypersensitivity to tuberculin. When exposed to high temperatures, the pathogen of tuberculosis is presumably to form structures that are capable to restore viability under certain conditions (for example, on the VCG medium).
Assuntos
Temperatura Alta , Mycobacterium tuberculosis/fisiologia , Testes de Aglutinação , Animais , Bacteriólise , Meios de Cultura , Cobaias , Hipersensibilidade Tardia , Soros Imunes/imunologia , Técnicas Imunoenzimáticas , Mycobacterium bovis/crescimento & desenvolvimento , Mycobacterium bovis/imunologia , Mycobacterium bovis/fisiologia , Mycobacterium tuberculosis/crescimento & desenvolvimento , Mycobacterium tuberculosis/imunologia , Reação em Cadeia da Polimerase , Tuberculina/imunologiaRESUMO
The process e(+)e(-)-->mu(+)mu(-) has been studied by the SND detector at the VEPP-2M e(+)e(-) collider in the phi(1020)-resonance energy region. The measured effective phi meson leptonic branching ratio B(phi-->l(+)l(-)) identical with square root of B(phi-->e(+)e(-))B(phi-->mu(+)mu(-))] = (2.89 +/- 0.10 +/- 0.06) x 10(-4) agrees well with the Particle Data Group value B(phi-->e(+)e(-)) = (2.91 +/- 0.07) x 10(-4), confirming mu-e universality. Without additional assumption of mu-e universality the branching ratio B(phi-->mu(+)mu(-)) = (2.87 +/- 0.20 +/- 0.14) x 10(-4) was obtained.
