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1.
Inorg Chem ; 62(44): 18040-18048, 2023 Nov 06.
Artigo em Inglês | MEDLINE | ID: mdl-37871177

RESUMO

Below 42 K, the homometallic Co3O2BO3 ludwigite forms magnetic planes separated by nonmagnetic low-spin Co3+ ions. The substitution of Co3+ by other nonmagnetic ions enhances the magnetic interactions, raising the magnetic ordering temperature. However, depending on the nonmagnetic dopant ion, the remaining Co3+ ions could adopt a high-spin state, creating magnetic frustration and lowering the magnetic transition temperature. Doping Co3O2BO3 with nonmagnetic In3+ ions favors the appearance of both high-spin Co2+ and Co3+. The In3+ ions preferentially occupy sites 4 and are randomly distributed in each site. The two-dimensional magnetic character of the parent compound, Co3O2BO3, is preserved, and the magnetic transition temperature increases to 47.8 K. Measurements of magnetization, which show metamagnetic transitions at low temperatures, and specific heat are consistent with ferrimagnetic ordering in this system. Thus, using these results and those reported in the literature, the effects caused by doping of Co3O2BO3 with different nonmagnetic +3 ions are discussed in terms of the presence of high-spin Co2+ and Co3+ in the compounds.

2.
Front Vet Sci ; 10: 1235299, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37701528

RESUMO

This study included 47 free-ranging bats from the State of Minas Gerais, Brazil. Six bats (12.8%) had genital inflammatory lesions, and two of them (one Artibeus lituratus and one Glossophaga soricina, a frugivorous and a nectarivorous, respectively) were diagnosed with Brucella sp. infection through PCR, and antigens in intralesional macrophages were detected using immunohistochemistry.

3.
J Comp Pathol ; 198: 16-21, 2022 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-36116887

RESUMO

Neoplastic masses were evaluated in the rostral region of the mandible of three young adult cattle. In all three cases, the masses were macroscopically large, firm, ulcerated, infiltrative, whitish and solid, and led to tooth displacement and loss. Radiographically, the neoplastic masses were intraosseous and radiolucent with foci of radiopacity. Loss of radiopacity due to bone necrosis was seen in the mandibular bone adjacent to the neoplasms. Histologically, well-differentiated, infiltrative non-encapsulated mesenchymal neoplastic proliferation replaced the mandibular bone and extended to the oral mucosa in all three cases. The neoplastic cells had scant cytoplasm and fusiform or oval hyperchromatic nuclei with loose chromatin, and were arranged in bundles in various directions. Within the neoplastic tissue, there were mineralized bone trabeculae and unmineralized osteoid, lined by a layer of osteoblasts and osteocytes within the lacunae. The pre-existing bone tissue adjacent to the neoplasm had areas of necrosis and osteoclasis of variable extent and intensity. Based on the macroscopic, radiographic and microscopic findings, a diagnosis of mandibular ossifying fibroma was established in all three cattle.


Assuntos
Doenças dos Bovinos , Fibroma Ossificante , Neoplasias Mandibulares , Neoplasias de Tecidos Moles , Animais , Bovinos , Doenças dos Bovinos/diagnóstico por imagem , Cromatina , Fibroma Ossificante/veterinária , Mandíbula/patologia , Neoplasias Mandibulares/diagnóstico por imagem , Neoplasias Mandibulares/veterinária , Neoplasias de Tecidos Moles/veterinária
4.
J Phys Condens Matter ; 27(17): 176002, 2015 May 08.
Artigo em Inglês | MEDLINE | ID: mdl-25872783

RESUMO

We have synthesized for the first time the metastable compound 1T-CrTe2. We have done its complete structural characterization and measured its magnetization, specific heat and electrical resistivity between 4 and 330 K. We have also performed detailed band structure calculations. We have found that it crystallizes in the CdI2 structure type and that its electrical resistance follows a metallic behaviour below room temperature. Its magnetization and specific heat curves show that the compound has a transition to a ferromagnetic state at TC = 310 K, with the magnetic moments ordered parallel to the basal plane. From the specific heat measurements and the ferromagnetic solutions obtained from our DFT calculations, we conclude that the ferromagnetism is of itinerant nature.

5.
J Phys Condens Matter ; 26(15): 155702, 2014 Apr 16.
Artigo em Inglês | MEDLINE | ID: mdl-24675791

RESUMO

We determine the pressure phase diagram of the 1111 compounds CaFeAsF and SrFeAsF, up to 20 GPa and down to 4 K by electrical resistivity measurements and the change of structure up to 40 GPa at room temperature. The antiferromagnetic transition temperature, as determined by the derivative peak, shows a minimum at ~5 GPa (10 GPa) for the Ca (Sr) compound. For CaFeAsF, superconductivity appears at this minimum, coincident with the development of a previously reported monoclinic phase. For SrFeAsF, where the orthorhombic and the monoclinic phase were reported to coexist, superconductivity exists above P≥1 GPa. Both phase diagrams can be scaled by a shift of ~10 GPa pressure at which the volume of SrFeAsF and that of CaFeAsF at ambient pressure coincide. The difference of our phase diagram with that of electron-doped 1111 samples is accounted for by hole doping under pressure, which we verified through electron band structure calculations.


Assuntos
Arsenicais/química , Pressão Atmosférica , Compostos de Cálcio/química , Condutividade Elétrica , Compostos Ferrosos/química , Estrôncio/química , Temperatura de Transição , Modelos Químicos , Transição de Fase , Difração de Raios X
6.
Braz. j. phys. ther. (Impr.) ; 16(2): 122-127, mar.-abr. 2012. graf, tab
Artigo em Inglês | LILACS | ID: lil-624727

RESUMO

OBJECTIVE: To evaluate the effects of different instructions for the assessment of maximum walking speed during the ten-meter walking test with chronic stroke subjects. METHODS: Participants were instructed to walk under four experimental conditions: (1) comfortable speed, (2) maximum speed (simple verbal command), (3) maximum speed (modified verbal command-"catch a bus") and (4) maximum speed (verbal command + demonstration). Participants walked three times in each condition and the mean time to cover the intermediate 10 meters of a 14-meter corridor was registered to calculate the gait speed (m/s). Repeated-measures ANOVAs, followed by planned contrasts, were employed to investigate differences between the conditions (α=5%). Means, standard deviations and 95% confidence intervals (CI) were calculated. RESULTS: The mean values for the four conditions were: (1) 0.74m/s; (2) 0.85 m/s; (3) 0.93 m/s; (4) 0.92 m/s, respectively, with significant differences between the conditions (F=40.9; p<0.001). Comfortable speed was significantly slower than the maximum speed, indicating that the participants were able to increase speeds when required. Significant differences were observed between the second condition with the third (p=0.002; 95%CI=-0.13 to -0.03) and the fourth conditions (p=0.004; 95%CI=-0.12 to -0.02) with no differences between the third and fourth conditions (p=1.00; 95%CI=-0.04 to 0.05). CONCLUSIONS: The results indicated that simple verbal commands were not sufficient to capture maximum gait speed with chronic stroke subjects. Thus, for clinical assessments and research purposes, where measurements of the maximum gait speed are necessary, modified verbal commands or demonstration strategies could be employed by physical therapists to ensure acurate information.


OBJETIVO: Avaliar os efeitos de diferentes instruções para avaliação da velocidade de marcha máxima de indivíduos hemiparéticos durante o teste de caminhada de 10 metros. MÉTODOS: Os indivíduos deambularam em quatro condições experimentais: (1) velocidade habitual, (2) velocidade máxima (comando verbal simples), (3) velocidade máxima (comando verbal modificado: pegar ônibus), (4) velocidade máxima (comando verbal + demonstração). Solicitou-se a cada participante que deambulasse três vezes em cada condição, e a média do tempo necessário para percorrer os 10 metros intermediários de um corredor de 14 metros foi utilizada para cálculo da velocidade (m/s). A ANOVA de medidas repetidas, com contrastes pré-planejados, foi utilizada para comparação dos dados (α=5%), sendo apresentados valores de média, desvio-padrão e intervalos de confiança (IC) de 95%. RESULTADOS: As médias de velocidade para as quatro condições foram: (1) 0,74m/s; (2) 0,85m/s; (3) 0,93m/s; (4) 0,92m/s, respectivamente, apresentando diferenças significativas entre as condições (F=40,9; p<0,001). A velocidade de marcha habitual diferiu das demais condições, indicando que os indivíduos foram capazes de aumentar a velocidade quando solicitados. Foram observadas diferenças significativas entre a segunda condição, a terceira (p=0,002; IC95%=-0,13 a -0,03) e a quarta (p=0,004; IC95%=-0,12 a -0,02), sendo que as duas últimas condições não diferiram entre si (p=1,00; IC95%=-0,04 a 0,05). CONCLUSÕES: Os resultados indicaram que comandos verbais simples não foram suficientes para captar velocidade de marcha máxima em indivíduos com hemiparesia crônica. Assim, em situações em que seja necessária a avaliação de velocidade máxima, deve-se utilizar estratégia de comando verbal modificada ou associada à demonstração para garantir acurácia da informação.


Assuntos
Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Teste de Esforço/métodos , Marcha , Paresia/fisiopatologia , Doença Crônica , Fatores de Tempo
7.
Rev Bras Fisioter ; 16(2): 122-7, 2012 Apr.
Artigo em Inglês, Português | MEDLINE | ID: mdl-22378478

RESUMO

OBJECTIVE: To evaluate the effects of different instructions for the assessment of maximum walking speed during the ten-meter walking test with chronic stroke subjects. METHODS: Participants were instructed to walk under four experimental conditions: (1) comfortable speed, (2) maximum speed (simple verbal command), (3) maximum speed (modified verbal command--"catch a bus") and (4) maximum speed (verbal command + demonstration). Participants walked three times in each condition and the mean time to cover the intermediate 10 meters of a 14-meter corridor was registered to calculate the gait speed (m/s). Repeated-measures ANOVAs, followed by planned contrasts, were employed to investigate differences between the conditions (α=5%). Means, standard deviations and 95% confidence intervals (CI) were calculated. RESULTS: The mean values for the four conditions were: (1) 0.74m/s; (2) 0.85 m/s; (3) 0.93 m/s; (4) 0.92 m/s, respectively, with significant differences between the conditions (F=40.9; p<0.001). Comfortable speed was significantly slower than the maximum speed, indicating that the participants were able to increase speeds when required. Significant differences were observed between the second condition with the third (p=0.002; 95%CI=-0.13 to -0.03) and the fourth conditions (p=0.004; 95%CI=-0.12 to -0.02) with no differences between the third and fourth conditions (p=1.00; 95%CI=-0.04 to 0.05). CONCLUSIONS: The results indicated that simple verbal commands were not sufficient to capture maximum gait speed with chronic stroke subjects. Thus, for clinical assessments and research purposes, where measurements of the maximum gait speed are necessary, modified verbal commands or demonstration strategies could be employed by physical therapists to ensure accurate information.


Assuntos
Teste de Esforço/métodos , Marcha , Paresia/fisiopatologia , Doença Crônica , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Fatores de Tempo
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