70 research outputs found

    Preparation Of Thermosensitive Gel For Controlled Release Of Levofloxacin And Their Application In The Treatment Of Multidrug-resistant Bacteria

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    Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Levofloxacin is a synthetic broad-spectrum antibacterial agent for oral or intravenous administration. Chemically, levofloxacin is the levorotatory isomer (L-isomer) of racemate ofloxacin, a fluoroquinolone antibacterial agent. Quinolone derivatives rapidly and specifically inhibit the synthesis of bacterial DNA. Levofloxacin has in vitro activity against a broad range of aerobic and anaerobic Gram-positive and Gram-negative bacteria. However, formulation of combined poloxamers thermoregulated (as Pluronic (R) F127) and levofloxacin for use in multiresistant bacterial treatment were poorly described in the current literature. Thus, the aim of the present work is to characterize poloxamers for levofloxacin controlled release and their use in the treatment of multidrug bacterial resistance. Micelles were produced in colloidal dispersions, with a diameter between 5 and 100 nm, which form spontaneously from amphiphilic molecules under certain conditions as concentration and temperature. Encapsulation of levofloxacin into nanospheres showed efficiency and enhancement of antimicrobial activity against Escherichia coli, Pseudomonas aeruginosa, and Klebsiella pneumoniae when compared with only levofloxacin. Furthermore, all formulations were not cytotoxic for NIH/3T3 cell lineage. In conclusion, poloxamers combined with levofloxacin have shown promising results, better than alone, decreasing the minimal inhibitory concentration of the studied bacterial multiresistance strains. In the future, this new formulation will be used after being tested in animal models in patients with resistant bacterial strains.FAPESP [2011/21822-3, 2011/21685-6, 2014/14457-5]Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP

    Problemas difusivos transientes com propriedades termofísicas variáveis em células de combustível nuclear retangulares

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    Neste trabalho foi apresentada a solução de problemas difusivos transientes em células de combustível nuclear retangulares que apresentam fontes de geração de calor uniformes e propriedades termofísicas variáveis em seu domínio submetidas às condições de contorno de Dirichlet. Para facilitar o tratamento analítico, a equação da difusão foi linearizada fazendo uso da Transformada de Kirchhoff sobre o potencial temperatura. Para a determinação da distribuição da temperatura na célula de combustível a Técnica da Transformada Integral Generalizada (TTIG) foi utilizada sobre a equação da difusão no domínio. Os parâmetros físicos de interesse foram determinados para diversas razões de aspecto. Os resultados obtidos foram comparados com os da solução pela Técnica de Volumes Finitos utilizando o software comercial ANSYS

    TEOS thin films obtained by plasma polymerization on Ti6Al4V alloys : influence of the deposition pressure on surface properties and cellular response

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    The modification of surfaces by the application of thin films has been used in the regenerative medicine area to increase the biocompatibility of metal implants. Titanium alloy has been recently used as substrate in poly merization for biomedical application. In this context, silane films were obtained by plasma polymerization in favor of the sol-gel method and the influence of different pressures in obtaining these films by argon plasma polymerization was evaluated from the alkoxysilane precursor tetraethoxysilane (TEOS) on the Ti6Al4V alloy. The morphological characterization of the films was performed by AFM, Profilometry and Spectral Ellipsometry and the chemical composition was analyzed by XPS. The biological behavior was evaluated by analyzing the mitochondrial activity and cellular viability of mesenchymal stem cells. The plasma polymerization process resulted in the deposition of a nanometric Si-based film formed, predominantly, by Si-O and organosilane bonds. The films that were applied on a sanded surface, with lower pressures in the plasma polymerization process, presented a lower layer thickness and wettability than the films obtained on nanotextured surfaces. Considering absorbance values, the Ti6Al4V samples mechanically sanded and deposited by plasma polymerization at 230 µatm presented better cell viability than samples with nanotextured surfaces coated with plasma polymerized film, indicating this material has potential to biomedical application

    Association between five candidate genes and milk yield in the Saavedreña creole cattle breed

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    Utilizando PCR-RFLP y AS-PCR se caracterizaron los polimorfismos de los genes candidatos aS1-caseína, k-caseína, b-lactoglobulina, prolactina y hormona de crecimiento en 146 muestras de sangre de vacas Criolla Saavedreña de la Estación Experimental de Saavedra (Bolivia) seleccionadas para producción lechera estudiando la asociación de dichos genes con la producción de leche en vacas de primera lactancia. El único locus que evidenció diferencias significativas en producción de leche entre los tres posibles genotipos fue CASk, siendo el genotipo AA el que se encontró asociado con una mayor producción de leche (F= 5,75; p= 0,004). Este genotipo produjo 20 p.100 (150 litros) más que los genotipos BB y AB.Using PCR-RFLP and AS-PCR the candidate genes aS1-casein, k-casein, b-Lactoglobulin, prolactin and growth hormone were characterized in 146 Saavedreño Creole cows belonging to the Saavedra Experimental Station (Bolivia) and the association between these genes and milk yield in first lactation cows was analyzed. Only k-casein locus exhibit significant differences between milk yield of its different genotypes, being the genotype AA the most productive (F= 5.75; p= 0.004). This genotype produced 20 percent (150 l) more than BB and AB genotypes.Fil: Ripoli, María Verónica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico CONICET- La Plata. Instituto de Genética Veterinaria "Ing. Fernando Noel Dulout". Universidad Nacional de La Plata. Facultad de Ciencias Veterinarias. Instituto de Genética Veterinaria; ArgentinaFil: Corva, Pablo Marcelo. Universidad Nacional de Mar del Plata. Facultad de Ciencias Agrarias; ArgentinaFil: Antonini, Alicia Graciela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico CONICET- La Plata. Instituto de Genética Veterinaria "Ing. Fernando Noel Dulout". Universidad Nacional de La Plata. Facultad de Ciencias Veterinarias. Instituto de Genética Veterinaria; ArgentinaFil: de Luca, Julio Cesar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico CONICET- La Plata. Instituto de Genética Veterinaria "Ing. Fernando Noel Dulout". Universidad Nacional de La Plata. Facultad de Ciencias Veterinarias. Instituto de Genética Veterinaria; ArgentinaFil: Rojas, F.. Centro de Investigación Agrícola Tropical (ciat); BoliviaFil: Dulout, Fernando Noel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico CONICET- La Plata. Instituto de Genética Veterinaria "Ing. Fernando Noel Dulout". Universidad Nacional de La Plata. Facultad de Ciencias Veterinarias. Instituto de Genética Veterinaria; ArgentinaFil: Giovambattista, Guillermo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico CONICET- La Plata. Instituto de Genética Veterinaria "Ing. Fernando Noel Dulout". Universidad Nacional de La Plata. Facultad de Ciencias Veterinarias. Instituto de Genética Veterinaria; Argentin

    Association between five candidate genes and milk yield in the Saavedreña creole cattle breed

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    Utilizando PCR-RFLP y AS-PCR se caracterizaron los polimorfismos de los genes candidatos aS1-caseína, k-caseína, b-lactoglobulina, prolactina y hormona de crecimiento en 146 muestras de sangre de vacas Criolla Saavedreña de la Estación Experimental de Saavedra (Bolivia) seleccionadas para producción lechera estudiando la asociación de dichos genes con la producción de leche en vacas de primera lactancia. El único locus que evidenció diferencias significativas en producción de leche entre los tres posibles genotipos fue CASk, siendo el genotipo AA el que se encontró asociado con una mayor producción de leche (F= 5,75; p= 0,004). Este genotipo produjo 20 p.100 (150 litros) más que los genotipos BB y AB.Using PCR-RFLP and AS-PCR the candidate genes aS1-casein, k-casein, b-Lactoglobulin, prolactin and growth hormone were characterized in 146 Saavedreño Creole cows belonging to the Saavedra Experimental Station (Bolivia) and the association between these genes and milk yield in first lactation cows was analyzed. Only k-casein locus exhibit significant differences between milk yield of its different genotypes, being the genotype AA the most productive (F= 5.75; p= 0.004). This genotype produced 20 percent (150 l) more than BB and AB genotypes.Instituto de Genética Veterinari

    Association between five candidate genes and milk yield in the Saavedreña creole cattle breed

    Get PDF
    Utilizando PCR-RFLP y AS-PCR se caracterizaron los polimorfismos de los genes candidatos aS1-caseína, k-caseína, b-lactoglobulina, prolactina y hormona de crecimiento en 146 muestras de sangre de vacas Criolla Saavedreña de la Estación Experimental de Saavedra (Bolivia) seleccionadas para producción lechera estudiando la asociación de dichos genes con la producción de leche en vacas de primera lactancia. El único locus que evidenció diferencias significativas en producción de leche entre los tres posibles genotipos fue CASk, siendo el genotipo AA el que se encontró asociado con una mayor producción de leche (F= 5,75; p= 0,004). Este genotipo produjo 20 p.100 (150 litros) más que los genotipos BB y AB.Using PCR-RFLP and AS-PCR the candidate genes aS1-casein, k-casein, b-Lactoglobulin, prolactin and growth hormone were characterized in 146 Saavedreño Creole cows belonging to the Saavedra Experimental Station (Bolivia) and the association between these genes and milk yield in first lactation cows was analyzed. Only k-casein locus exhibit significant differences between milk yield of its different genotypes, being the genotype AA the most productive (F= 5.75; p= 0.004). This genotype produced 20 percent (150 l) more than BB and AB genotypes.Instituto de Genética Veterinari

    Implementação de protocolo para profilaxia de tromboembolismo venoso : um estudo antes e depois em pacientes clínicos e cirúrgicos

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    Objective: This study aimed to assess the adequacy of venous thromboembolism (VTE) prophylaxis prescription after a protocol implementation. Methods: This was a before-and-after study conducted in a tertiary care hospital in Rio Grande do Sul, Southern Brazil. Medical and surgical inpatients aged 18 years or older were assessed for VTE risk and subsequently for thromboprophylaxis adequacy, according to their risk. The evaluations occurred before and after the protocol strategy implementation; it consisted of an online platform to access the protocol, a public posting of the protocol diagram, clinical alerts on the medical staff TV, e-mail alerts, and pop-up alerts on the computerized physician order entry system. The main outcome measure was the adequacy of VTE prophylaxis prescription according to the protocol. Results: A total of 429 patients were evaluated for thromboprophylaxis adequacy (213 before and 216 after). The prevalence of adequacy increased from 54% to 63% (pre and post-intervention, respectively), and after adjustment for patient type and phase of the study, the prevalence ratio reached (PR)=1.20, 95% confidence interval (CI) 1.02-1.42. Conclusion: The results showed that the overall appropriateness of thromboprophylaxis prescription was weakly improved. Despite these results, this study provides evidence to date a bunch of strategies for protocol implementations in private institutions in middle-income countries with an open medical staff, as there are few studies investigating these simple and pragmatic interventions.Objetivo: Este estudo visou avaliar a adequação da prescrição de profilaxia de tromboembolismo venoso (TEV) após a implementação do protocolo. Métodos: Trata-se de um estudo antes e depois realizado em um hospital de cuidados terciários no Rio Grande do Sul, Brasil. Pacientes clínicos e cirúrgicos internados, com 18 anos ou mais, foram avaliados para o risco de TEV e, posteriormente, para adequação da tromboprofilaxia, de acordo com o risco. As avaliações ocorreram antes e depois de uma estratégia de implementação de protocolo, que consistiu em uma plataforma on-line para acessar o protocolo, uma postagem pública do diagrama do protocolo, alertas clínicos na sala de convívio médico, alertas de e-mail e alertas pop-up no sistema informatizado de prescrição médica. O Desfecho principal foi a adequação da prescrição de profilaxia do TEV de acordo com o protocolo. Resultados: Foram avaliados 429 pacientes para adequação da tromboprofilaxia (213 antes e 216 depois). A prevalência de adequação aumentou de 54% para 63% (pré e pós-intervenção, respectivamente) e após o ajuste por tipo de paciente e fase do estudo, a razão de prevalência atingiu (RP) = 1,20, intervalo de confiança de 95% (IC) 1,02-1,42. Conclusões: os resultados mostraram que a adequação geral da prescrição de tromboprofilaxia foi discretamente melhorada. Apesar desses resultados, este estudo fornece evidências, até o momento, de uma série de estratégias para implementar o protocolo em instituições privadas em países de renda média com uma equipe médica aberta, pois há poucas pesquisas investigando esse tipo de intervenção simples e pragmática
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