Integration of experiment and computational modeling on the Tb doping process in CaMoO4 obtained by USP method: An efficient way to obtain photoluminescent materials.

In this paper, we present a combined experimental and theoretical study to disclose, the structure, electronic and optical properties of CaMoO 4 :xTb 3+ ( x = 1%, 2%, and 4%) microspheres. The microspheres were prepared by ultrasonic spray pyrolysis method and characterized by experimental and theoretical techniques. Theoretical calculations and XRD patterns indicate that these crystals have a scheelite-type tetragonal structure. The morphology of the CaMoO 4 :xTb 3+ ( x = 1%, 2% and 4% mol) samples were investigated from the FEG-SEM results and the formation of microspheres with a spherical shape were observed. The optical properties were investigated by UV-Vis and PL spectroscopy, as well as the chromaticity coordinates of these compounds. This also allowed us to understand the charge transfer process that happens in the singlet state and the excited states, generating the photoluminescence emissions of the Tb doping process in CaMoO 4 microspheres.

[Distribution of anti-Neospora caninum antibodies in dairy cows at municipalities of Resende and Rio Claro in the State of Rio de Janeiro, Brazil]. / Distribuição de anticorpos contra Neospora caninum em vacas leiteiras dos municípios de Resende e Rio Claro, Estado do Rio de Janeiro, Brasil.

This study aimed to verify the prevalence of anti-Neospora caninum antibodies in dairy cows from municipalities of Resende and Rio Claro, both located at sulfluminense dairy belt. A total of 29 farms from Resende and 28 from Rio Claro were randomly selected. To evaluate the association between herds and animals against the etiological agent χ² tests were used. Seventy eight animals at Resende (25.74%, confidence intervals(IC) at 95%: 15.7-25.8%) had anti-N. caninum antibodies, while 53 animals (20.38%, IC 21-31.1%) at Rio Claro (p=0.16). No association between positive animals in relationship to municipalities was observed. When considered properties, 26 (89.7%, IC: 76, 3-94.9%) at Resende and 24 (85.71%, IC: 67.3-96%) at Rio Claro had at least a positive animal. This demonstrated that anti-N. caninum antibodies were observed among dairy cows at both municipalities. In spite of abortions were observed with relative frequency in endemic areas of N. caninum, they were not observed in the present study.

[Prevalence of anti-Toxoplasma gondii antibodies in dairy cattle from Sul Fluminense Paraíba Valley, State of Rio de Janeiro]. / Prevalência de anticorpos anti-Toxoplasma gondii em bovinos leiteiros do Vale do Paraíba sul Fluminense, Estado do Rio de Janeiro.

A survey of toxoplasmosis in cattle from Sul Fluminense Paraiba Valley micro region in the State of Rio de Janeiro was realized, where serum samples were collected from 589 animals of 29 dairy farms located at municipalities of Resende and Rio Claro. Serology was performed by using indirect immune fluorescent test (IFAT), and considering as positive to Toxoplasma gondii titles > or = 64. Results found in both municipalities were 14.8% serum reagents animals. When these results were analyzed by each Municipality, Resende had 15.3% (48 animals of 314) positive animals, and 14.2% (39 animals of 275) was observed at Rio Claro. In the analysis of 58 studied dairy farms was observed that 38 (65.5%) of them having positive cows for anti-T. gondii, being 20 (69.0%) at Resende, and 18 (62.1%) at Rio Claro. With regard to serologic samples found in the IFAT, 79 (13.41%) animals were positives with titles of 64, six (1.02%) with 256, two (0.34%) with 1024, and none of animals had titles > or = 4096.