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Search Results: 1 - 10 of 1846 matches for " FCT;Guedes "
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Antibacterial properties of contact defensive secretions in neotropical Crematogaster ants
Quinet, Y;Vieira, RHSF;Sousa, MR;Evangelista-Barreto, NS;Carvalho, FCT;Guedes, MIF;Alves, CR;de Biseau, JC;Heredia, A;
Journal of Venomous Animals and Toxins including Tropical Diseases , 2012, DOI: 10.1590/S1678-91992012000400013
Abstract: crematogaster ants use their contact venoms to compete with other ants. although those venoms are used primarily as repellent and toxic secretions, they may have other functions. the present study aimed to test the antibacterial property of abdominal venom of three neotropical crematogaster ant species (c. distans, c. pygmaea and c. rochai) against gram-negative (escherichia coli and pseudomonas aeruginosa) and gram-positive (enterococcus faecalis and staphylococcus aureus) bacteria. sterile filter paper was soaked with c. distans, c. pygmaea or c. rochai crude venom and placed on an agar dish that was inoculated with bacterial suspensions. the agar dish was incubated overnight at 37oc and examined for zones of growth inhibition. for each tested venom and bacterial strain, three venom concentrations were used, with six replicates for each concentration: 1, 2 and 4 dge (dufour's gland equivalent). the venom of c. pygmaea, but not those of c. rochai and c. distans, inhibited the growth of all tested gram-positive and gram-negative bacterial strains. this is the first evidence of antibacterial properties of contact venoms in crematogaster ants and it supports the claim that ant venoms are multifunctional. it is hypothesized that only c. pygmaea venom showed antibacterial activities due to its nesting habits.
Recent perspectives into biochemistry of decavanadate
Manuel Aureliano,FCT,University of Algarve,Gambelas
World Journal of Biological Chemistry , 2011, DOI: 10.4331/wjbc.v2.i10.215
Abstract: The number of papers about decavanadate has doubled in the past decade. In the present review, new insights into decavanadate biochemistry, cell biology, and antidiabetic and antitumor activities are described. Decameric vanadate species (V10) clearly differs from monomeric vanadate (V1), and affects differently calcium pumps, and structure and function of myosin and actin. Only decavanadate inhibits calcium accumulation by calcium pump ATPase, and strongly inhibits actomyosin ATPase activity (IC50 = 1.4 μmol/L, V10), whereas no such effects are detected with V1 up to 150 μmol/L; prevents actin polymerization (IC50 of 68 μmol/L, whereas no effects detected with up to 2 mmol/L V1); and interacts with actin in a way that induces cysteine oxidation and vanadate reduction to vanadyl. Moreover, in vivo decavanadate toxicity studies have revealed that acute exposure to polyoxovanadate induces different changes in antioxidant enzymes and oxidative stress parameters, in comparison with vanadate. In vitro studies have clearly demonstrated that mitochondrial oxygen consumption is strongly affected by decavanadate (IC50, 0.1 μmol/L); perhaps the most relevant biological effect. Finally, decavanadate (100 μmol/L) increases rat adipocyte glucose accumulation more potently than several vanadium complexes. Preliminary studies suggest that decavanadate does not have similar effects in human adipocytes. Although decavanadate can be a useful biochemical tool, further studies must be carried out before it can be confirmed that decavanadate and its complexes can be used as anticancer or antidiabetic agents.
El Mercado Central de Santiago: Antes de su embarque a Chile
ARQ (Santiago) , 2006, DOI: 10.4067/S0717-69962006000300002
Abstract: la fantasía de la globalización ronda chile desde la colonia. el edificio del mercado central de santiago, cuya estructura fue dise?ada y construida en gran breta?a, hoy es objeto de miradas anestesiadas; sin embargo, en la época de su construcción fue considerado en europa como caso ejemplar de la arquitectura metálica de ultramar.
Quem lidera os governos europeus? A carreira dos primeiros-ministros (1946-2006)
Análise Social , 2009,
Abstract: this article seeks to understand who the european prime ministers are, as well as to ascertain how institutions and parties can influence their profiles. the findings show that the different institutional organizations of democracies exert diverse influences upon their careers. on the contrary, the ideologies of the parties, the key gatekeepers of the political elite, do not significantly affect the profile of prime ministers.
Cidade e Espa?o Político
Guedes, Joaquim;
Psicologia USP , 2003, DOI: 10.1590/S0103-65642003000300007
Abstract: the city is its architecture and it comprehends the organization and utilization of the territory for social-economic and therefore physical-enviromental and political development. g. c. argan?s epigraph is impeccable. it sums up the implicit and visible webs and correlations on the topic of the construction of the human environment and its appropriation by individuals and comunities, privately and publicly, to comply with the sacred needs which emanate from daily life, the reproduction and survival of the species and the invention of culture and history. those relate to the material infra and superstructure of shelter and operational support to the social and productive life, within the actual conditions of the relations of power and production. that is a sine qua non condition for the emergence of social life. the matter-construction?s magics come to life. it is convenient to purge it from the dictators? demagogic discourse, as well as the so-called democrats, pressed by their mandate?s renewal, in their urge for power, delusive rhetoric, electoral fraud, all of them unavoidable these days.
Parentesco, escravid?o e liberdade (Porto Feliz, S?o Paulo, século XIX)
Guedes, Roberto;
Varia Historia , 2011, DOI: 10.1590/S0104-87752011000100011
Abstract: focused in porto feliz, captaincy/province of s?o paulo, this study analyzes how family reasons influenced conflicts between masters and slaves about freedom and slavery. at the ends of slavery, with pressures for freedom and relative loss of legitimacy of slavery, a master family tried to preserve its social position, built up over generations and over slavery. by other hand, slaves families sought to achieve freedom. thus, a former slave family and a slave family joined forces to defend their kinships interests
El Mercado Central de Santiago: Antes de su embarque a Chile
Pedro Guedes
ARQ , 2006,
Abstract: La fantasía de la globalización ronda Chile desde la Colonia. El edificio del Mercado Central de Santiago, cuya estructura fue dise ada y construida en Gran Breta a, hoy es objeto de miradas anestesiadas; sin embargo, en la época de su construcción fue considerado en Europa como caso ejemplar de la arquitectura metálica de ultramar.
Sociabilidade e sociedade de risco: um estudo sobre rela es na modernidade
Cristiano Guedes
Physis: Revista de Saúde Coletiva , 2005, DOI: 10.1590/s0103-73312005000200009
Uma proposta de análise do sistema fonológico do Suyá
Marymarcia Guedes
Alfa : Revista de Linguística , 2001,
Abstract: O presente trabalho tem como objetivo fazer uma análise preliminar do sistema fonológico do Suyá, considerando-se basicamente os segmentos vocálicos e consonantais. Faz-se, também, uma aprecia o, ainda que breve, das análises sugeridas anteriormente por outros pesquisadores, principalmente Steinen e Davis. O primeiro faz uma abordagem da fonologia da língua e o segundo oferece uma análise diacrónico, propondo que a língua tenha uma deriva o direta do Proto-Jê.
A configura o da palavra como condicionante fonológico em Mb á
Marymarcia Guedes
Alfa : Revista de Linguística , 2001,
Abstract: O Mb á apresenta 2 regras fonológicas, para cuja formula o é necessário especificar a configura o total da palavra e n o apenas um de seus limites: — a primeira regra em quest o insere o segmento /h/ no início de palavra cuja configura o é #-V?V#; — a segunda regra reduplica a vogal de palavras monossilábicas em determinados contextos (particularidade esta que distingue o Mb á dos demais dialetos da língua Guarani). O Mb á , dialeto da língua Guarani, da família Tupi-Guaraní, do tronco lingüístico Tupi, é falado desde o Rio Grande do Sul até o Espírito Santo, sendo que no Estado de S o Paulo os Mb á encontram-se dispersos em diversos núcleos na parle oriental do Estado.
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