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Search Results: 1 - 10 of 174251 matches for " Ana F. "
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O assalto à educa??o pelos economistas
Almeida, Ana Maria F.;
Tempo Social , 2008, DOI: 10.1590/S0103-20702008000100008
Abstract: the article examines the process through which education from the 1970s onwards became a key variable for explaining the inequality in brazilian incomes and a public policy tool for economists. among other factors, this resulted from: (1) the struggle of professional educators between the 1930s and 1950s to produce a policy-oriented body of knowledge concerning education; and (2) the success of economists during the 1960s in imposing their own interpretative models of brazilian life, displacing the educators. in both periods, governments and transnational agencies facilitated an international circulation of people and ideas, manipulated as a resource by those involved in this competition.
Entrevista com Christian Baudelot e Roger Establet
Ana Maria F. Almeida
Tempo Social , 2008, DOI: 10.1590/s0103-20702008000100009
Building Nests in Our Classrooms
Ana Maria F. Barcelos
Humanising Language Teaching , 2009,
Characterization of the Trichomonas vaginalis surface-associated AP65 and binding domain interacting with trichomonads and host cells
Ana F Garcia, JF Alderete
BMC Microbiology , 2007, DOI: 10.1186/1471-2180-7-116
Abstract: We first wanted to demonstrate surface association of AP65 to the parasite followed by the identification of the binding epitope interacting with both organisms and VECs. AP65 was found to bind to trichomonads, but not to trypsin-treated parasites, in an auto-ligand assay, suggesting the existence of a surface protein associating with AP65. Since rabbit antiserum IgG antibodies reactive with epitopes localized to the N-terminal region of AP65 inhibit the attachment of live parasites to VECs, we hypothesized that the binding domain was localized to this region. We subcloned five overlapping fragments of AP65 called c1 through c5, and expression of recombinant clones was confirmed with antibodies to AP65. Each purified recombinant protein was then tested for binding activity using an established ligand assay, and fragment c1 with the first twenty-five amino acids in the N-terminal domain was required for binding to VECs and, surprisingly, also to parasites. Importantly, c1 competed with the binding of AP65 to both cells types.T. vaginalis AP65 is a secreted, surface-associated protein and a model is proposed to explain how this secreted protein functions as an adhesin.Trichomonas vaginalis causes trichomonosis, the most common, non-viral sexually transmitted infection (STI) in humans [1]. This STI poses a risk for adverse health consequences in both women and men. Adverse pregnancy outcomes, cervical neoplasia, atypical pelvic inflammatory disease are serious adverse outcomes for women [2-4]. Complications related to trichomonal infection in men are non-gonoccocal urethritis, prostatitis, epydidymitis, urethral disease, and infertility [4-8], and recently a relationship between trichomonosis and prostate cancer has been shown [9]. Furthermore, increased risk for HIV acquisition and seroconversion has been well documented in both women and men [10-13].T. vaginalis has increased ability to cytoadhere to epithelial versus fibroblast cells [14], and it is now accepted tha
Uma Heurística Composta para a Determina??o de Rotas para Veículos em Problemas com Janelas Temporais e Entregas e Recolhas
Moura,Ana; Oliveira,José F.;
Investiga??o Operacional , 2004,
Abstract: in this paper a new heuristic for the vehicle routing problem is presented. this algorithm was applied to a problem originated from a portuguese alimentary products distribution company. this company has many clients and more then 130 deliveries per day for all products. when considering these figures, the vehicle routing problem becomes too much complex to be manually solved. the necessity of automatization naturally arises. this new multi-phase heuristic has a constructive phase, a local optimisation phase and a pos-optimisation phase, and aims the minimization of the sum of the routes total time. additional constraints to the vehicle routing problem, driven by the particular company that motivated this work, are considered. in particular time-windows both for the drivers and for the clients and pick-up together with deliveries are considered.
Entre o estranho e o familiar: o uso de analogias no ensino de história
Monteiro, Ana Maria F. C;
Cadernos CEDES , 2005, DOI: 10.1590/S0101-32622005000300006
Abstract: based on the contributions of authors who use the concept of "school knowledge" and consider it as an original and specific creation of the school culture, this paper discusses the use of analogies in history teaching. since they help establish symbolic mediations and meaningful learning, analogies are often used by history teachers as a tool to help students understand school contents. they are recognized as a helpful resource to surpass the strangeness of unknown facts which become familiar by means of the comparisons provided. by relating scientific information to common sense, they help to transform the meanings of concepts and practices which are being studied, and configure an emblematic creation of school knowledge. nevertheless, the risk of anachronism requires teachers be attentive and cautious to avoid errors
Bioclimatologia e Vegeta o Natural Potencial
Ana F. Almeida,Miguel Capelo
Silva Lusitana , 2007,
An Improved Ras Sensor for Highly Sensitive and Quantitative FRET-FLIM Imaging
Ana F. Oliveira, Ryohei Yasuda
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0052874
Abstract: Ras is a signaling protein involved in a variety of cellular processes. Hence, studying Ras signaling with high spatiotemporal resolution is crucial to understanding the roles of Ras in many important cellular functions. Previously, fluorescence lifetime imaging (FLIM) of fluorescent resonance energy transfer (FRET)-based Ras activity sensors, FRas and FRas-F, have been demonstrated to be useful for measuring the spatiotemporal dynamics of Ras signaling in subcellular micro-compartments. However the predominantly nuclear localization of the sensors' acceptor has limited its sensitivity. Here, we have overcome this limitation and developed two variants of the existing FRas sensor with different affinities: FRas2-F (Kd~1.7 μM) and FRas2-M (Kd~0.5 μM). We demonstrate that, under 2-photon fluorescence lifetime imaging microscopy, FRas2 sensors provide higher sensitivity compared to previous sensors in 293T cells and neurons.
Central factorials under the Kontorovich-Lebedev transform of polynomials
Ana F. Loureiro,S. Yakubovich
Mathematics , 2011,
Abstract: We show that slight modifications of the Kontorovich-Lebedev transform lead to an automorphism of the vector space of polynomials. This circumstance along with the Mellin transformation property of the modified Bessel functions perform the passage of monomials to central factorial polynomials. A special attention is driven to the polynomial sequences whose KL-transform is the canonical sequence, which will be fully characterized. Finally, new identities between the central factorials and the Euler polynomials are found.
q-Differential equations for q-classical polynomials and q-Jacobi-Stirling numbers
Ana F. Loureiro,Jiang Zeng
Mathematics , 2013,
Abstract: We introduce, characterise and provide a combinatorial interpretation for the so-called $q$-Jacobi-Stirling numbers. This study is motivated by their key role in the (reciprocal) expansion of any power of a second order $q$-differential operator having the $q$-classical polynomials as eigenfunctions in terms of other even order operators, which we explicitly construct in this work. The results here obtained can be viewed as the $q$-version of those given by Everitt {\it et al.} and by the first author, whilst the combinatorics of this new set of numbers is a $q$-version of the Jacobi-Stirling numbers given by Gelineau and the second author.
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