Influence of impurities on the luminescence of Er3+ doped BaTiO3 nanophosphors

The influence of the presence of barium carbonate (BaCO3) phase on the luminescence properties of barium titanate nanocrystals (BaTiO3) powders was investigated. Structural and optical characterizations of erbium (Er3+) doped BaTiO3 synthesized by the sol-emulsion-gel were performed. Using Fourier transform infrared spectroscopy and X-ray powder diffraction, we identified the presence of impurities related to BaCO3 and quantified its fraction. It was observed that the presence of BaCO3 phase, even at low levels, depletes significantly the infrared-to-visible upconverted luminescence efficiency of the produced nanopowders

Influence of impurities on the luminescence of Er3+ doped BaTiO3 nanophosphors

The influence of the presence of barium carbonate (BaCO3) phase on the luminescence properties of barium titanate nanocrystals (BaTiO3) powders was investigated. Structural and optical characterizations of erbium (Er3+) doped BaTiO3 synthesized by the sol-emulsion-gel were performed. Using Fourier transform infrared spectroscopy and X-ray powder diffraction, we identified the presence of impurities related to BaCO3 and quantified its fraction. It was observed that the presence of BaCO3 phase, even at low levels, depletes significantly the infrared-to-visible upconverted luminescence efficiency of the produced nanopowders

POLIARTRITE, HEPATITE E BRONCOPNEUMONIA ABSCEDATIVA SECUNDÁRIAS A ONFALOFLEBITE EM UMA BEZERRA

Descreve-se um caso de onfaloflebite em uma bezerra de cinquenta dias de idade atendida na Clínica Médica e Cirúrgica de Grandes Animais. O animal apresentava sinais clínicos de diarreia e onfalite. Foi instituída terapia antimicrobiana e anti-inflamatória, além de correção da desidratação, porém o animal não apresentou melhora e foi a óbito, sendo posteriormente encaminhado ao Laboratório de Patologia Animal para realização de necropsia. Na necropsia foram observadas lesões absedativas no parênquima pulmonar, hepático e artrite séptica. O exame histopatológico revelou múltiplos abscessos no pulmão e fígado, com centro necrótico e miríades de agregados bacterianos circunscritos por acentuado infiltrado inflamatório neutrofílico e confirmando o quadro de septicemia, em consequência da onfaloflebite.  O diagnóstico foi realizado através de coleta de dados epidemiológicos, clínicos e patológicos

Increased interregional virus exchange and nucleotide diversity outline the expansion of chikungunya virus in Brazil

Abstract The emergence and reemergence of mosquito-borne diseases in Brazil such as yellow fever, zika, chikungunya, and dengue have had serious impacts on public health. Concerns have been raised due to the rapid dissemination of the chikungunya virus across the country since its first detection in 2014 in Northeast Brazil. In this work, we carried out on-site training activities in genomic surveillance in partnership with the National Network of Public Health Laboratories that have led to the generation of 422 chikungunya virus genomes from 12 Brazilian states over the past two years (2021–2022), a period that has seen more than 312 thousand chikungunya fever cases reported in the country. These genomes increased the amount of available data and allowed a more comprehensive characterization of the dispersal dynamics of the chikungunya virus East-Central-South-African lineage in Brazil. Tree branching patterns revealed the emergence and expansion of two distinct subclades. Phylogeographic analysis indicated that the northeast region has been the leading hub of virus spread towards other regions. Increased frequency of C > T transitions among the new genomes suggested that host restriction factors from the immune system such as ADAR and AID/APOBEC deaminases might be driving the genetic diversity of the chikungunya virus in Brazil