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Search Results: 1 - 10 of 60355 matches for " Pereira Zélia "
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Breeding of the blue-and-white swallow (Pygochelidon cyanoleuca) in the urban environment of southeastern Brazil
Zélia da Paz Pereira,Celine Melo
Biotemas , 2010,
Abstract: Pygochelidon cyanoleuca is a common species, but little is known about its biology and life history in the urban environment of southeastern Brazil. The objective of this study was to monitor the reproduction of the species in this environment. We determined the total number of nests, nesting peak, construction site, shape, composition and distribution pattern of nests, and the success and possible causes of reproductive failure. The study was conducted between July and December 2007, in the hall of the library of the Federal University of Uberlandia in Uberlandia, Minas Gerais, Brazil. Nests were screened in spinning gutters and fixtures in the ceiling of the hall. We found 33 nests, of which 31 were active. Two nesting peaks were observed (August and November). Most nests had a platform shape. The pattern of distribution was aggregate. 19.4% of the nests were successful. The causes of failure were predation and unviable eggs. Pygochelidon cyanoleuca was reasonably successful and was able to make use of the structure of the roof of the library to build its nests. However, the high frequency of unviable eggs underscores the importance of studies on the potential effects of urbanization on birds and other organisms of the Cerrado and other Brazilian regions.
Zélia Lopes da Silva,Marcia Pereira da Silva
História (S?o Paulo) , 2011, DOI: 10.1590/s0101-90742011000200001
Márcia Pereira da Silva,Zélia Lopes da Silva
História (S?o Paulo) , 2010, DOI: 10.1590/s0101-90742010000200001
Zélia Lopes da SILVA,Marcia Pereira da SILVA
História (S?o Paulo) , 2011, DOI: 10.1590/s0101-90742011000100001
Apresenta o
Márcia Pereira da Silva,Zélia Lopes da Silva
História (S?o Paulo) , 2010, DOI: 10.1590/s0101-90742010000100001
Zélia Leal Adghirni,Fábio Henrique Pereira
Brazilian Journalism Research , 2011,
Abstract: O artigo discute as limita es e potencialidades da pesquisa em jornalismo por meio da ado o do modelo de rede internacional. é apresentada a experiência da Rede de Estudos sobre o Jornalismo (REJ), fundada em 1999 e que conta com 33 pesquisadores vinculados a universidades na Alemanha, Bélgica, Brasil, Canadá, Fran a, México e Ilha da Reuni o. O relato mostra que, apesar das dificuldades existentes, a REJ se configura como um espa o de relativa autonomia na proposi o de objetos e metodologias de estudo sobre o jornalismo, o que se reflete na diversidade de abordagens e de interesses de pesquisa, desenvolvidos no ambito da Rede. Também permite um debate mais franco e horizontal entre pesquisadores que ocupam posi es distintas em suas carreiras. Observamos ainda coerência nas abordagens adotadas no interior da REJ, o que garante a continuidade dos programas de pesquisa desenvolvidos.
THE JOURNALISM STUDIES NETWORK (REJ) EXPERIENCE: a French-language experiment in collaborative research
Zélia Leal Adghirni,Fábio Henrique Pereira
Brazilian Journalism Research , 2011,
Abstract: This article discusses the limitations and potentialities of journalism research utilizing the international networking model. It presents the experience of the Journalism Studies Network (REJ in the French/Portuguese acronym), a French-language research experiment, founded in 1999 and made up of 33 researchers linked to universities in Germany, Belgium, Brazil, Canada, France, Mexico and on Reunion Island. The report shows that despite the existing difficulties, the REJ takes the form of a place with relative autonomy in proposing objectives and methodologies for the study of journalism, which is reflected in the diversity of approaches and research interests developed within the Network. It also permits a more frank and level debate between researchers who occupy different positions in their careers. Coherence is also observed in the approaches adopted inside the REJ, which assures the continuity of the research programs developed.
FTIR and UV?vis study of chemically engineered biomaterial surfaces for protein immobilization
Herman Mansur,Rodrigo Oréfice,Marivalda Pereira,Zélia Lobato,Wander Vasconcelos,Lucas Machado
Spectroscopy: An International Journal , 2002, DOI: 10.1155/2002/183053
Abstract: The biomaterials research field has broadened in the last 3 decades, including replacement of diseased or damaged parts, assist in healing, correct and improve functional abnormality, drug delivery systems, immunological kits and biosensors. Proteins play crucial role in almost every biological system. They are involved in enzymatic catalysis, transport and storage, coordinated motion, mechanical support, immune protection, control of growth and cell differentiation among many others. The immobilization of proteins onto surface functionalized substrates has been one of the most promising areas in bioengineering field. It is important to note that the term immobilization can refer either to a temporary or to a permanent localization of the biomolecule on or within a support. Proteins have very particular chain configurations and conformations that promote high levels of specificity during chemical interactions. In the present work, we aimed to study the phenomenon of protein immobilization onto biomaterial with chemically engineered surface. We have tailored the surface of the porous gels of SiO2 with 5 different silane surface modifying agents: tetraethoxysilane (TEOS), 3?mercaptopropyltrimethoxysilane (MPTMS) and 3?aminopropyltriethoxysilane (APTES), 3?glycidoxypropyltrimethoxysilane (GPTMS) and 3?isocyanatopropyltriethoxysilane (ICPES). Fourier Transform Infrared Spectroscopy (FTIR) was used to characterize the presence of all specific chemical groups in the materials. The surface functionalized gels were then immersed in porcine insulin (PI) solutions for protein immobilization. The incorporation of protein within the gels was also monitored by FTIR spectroscopy. The kinetics of protein adsorption and desorption from the gel matrix in vitro tests were monitored by UV?visible spectroscopy. We could not observe any evidence of denaturation of insulin after its desorption from gel matrices using UV?visible spectroscopy technique. In vivo tests with adult male rats were used to verify the immobilized insulin bioactivity after implantation of different biomaterial with functionalized surfaces. Plasma glucose levels were obtained by using the Glucose GOD?ANA Colorimetric Assay. All surface modified materials have presented acute hypoglycemic peak response associated with the insulin bioactivity.
Formación y producción periodística en Internet: desafíos y perspectivas en el escenario brasile?o
Mendon?a,Tha?s de; Pereira,Fábio Henrique; Leal-Adghirni,Zélia;
Palabra Clave , 2012,
Abstract: this paper discusses the job market, and analyses online and multimedia composition in brazilian cybermedia. it also reflects on the key changes that occurred in brazilian journalism with the advent of the internet, which have led to a process of journalistic deregulation through the rupture of historically construed rules, protocols and conventions. it also looks at the professional profiles emerging in this context and examines how this scenario influences the way future journalists are trained.
Suscetibilidade de Biomphalaria straminea (Dunker, 1848) de Piripiri (Piauí, Brasil) a duas cepas de Schistosoma mansoni Sambon, 1907
Carvalho,Omar dos Santos; Souza,Cecília Pereira de; Figueiredo,Paulo Zábulon de;
Revista de Saúde Pública , 1980, DOI: 10.1590/S0034-89101980000200009
Abstract: the susceptibility of descendents of a biomphalaria straminea sample from piripiri, piauí, brazil was tested with two strains of schistosoma mansoni: "le" (belo horizonte) and "sj" (s?o josé dos campos). the sj strain infected 12.5% of the surviving specimen of the b. straminea and 63.6% of the b. glabrata, which were used as controls. the b. straminea tested were refractory to the le strain; whereas, 84% of the b. glabrata were positive.
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