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Search Results: 1 - 10 of 30313 matches for " Anna Paola Fernandes Freire "
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A Informa o Contábil e a Hipótese do Mercado Eficiente: um Estudo Empírico Utilizando o Setor de Petróleo, Gás e Biocombustível do Brasil no Período 2006-2009
Anna Paola Fernandes Freire,Paulo Amilton Maia
Revista de Finan?as Aplicadas , 2012,
Abstract: Informa o sempre foi essencial. Neste sentido, a Teoria Contábil vem se desenvolvendo ao longo dos anos para fornecer informa es cada vez mais confiáveis e relevantes para os agentes econ micos com o intuito de ajudá-los em suas tomadas de decis es num ambiente de negócios cada vez mais complexo e incerto. A hipótese dos mercado eficiente estabelece que os pre os das a es no mercado financeiro já incorporam todas as informa es necessárias para a tomada de decis o. Como corolário desta hipótese, os agentes econ micos auferem retornos cuja volatilidade esta em sintonia com os pre os médios vigentes no mercado e aquela independe das informa es contábeis divulgadas pelas empresas. Ou seja, a divulga o dos balan os em data observada publicamente pela BOVESPA n o tem impacto na volatilidade dos retornos das a es negociadas naquela bolsa de valores. Com o intuito de testar a eficiência do mercado, este trabalho modela a volatilidade do retorno de algumas empresas do setor de Petróleo, Gás e Biocombustível através de um modelo T-GARCH. Os resultados sugerem que as informa es contábeis oferecidas nas datas estabelecidas pela BOVESPA n o s o causadores de quebra estrutural na volatilidade das a es das empresas aqui estudadas. Isto implica que a forma semi-forte da hipótese dos mercados eficientes é válida para os pre os das a es dessas empresas.
Open-access clinical trial registries: the Italian scenario
Mosconi Paola,Roberto Anna
Trials , 2012, DOI: 10.1186/1745-6215-13-194
Abstract: Background Citizens, patients and their representatives are increasingly insisting on working with health professionals to organize and discuss research protocols. The International Committee of Medical Journal Editors recommended setting up a public clinical trial registry where anyone can find key information about a trial. Around the world, governments have, in fact, now begun to legislate mandatory disclosure of all clinical trials. The aims of the present survey were to assess the availability of clinical trial registries for Italian citizens and to examine the transparency of the data items reported. Methods The availability of open-access clinical trial registries was surveyed on a sample of 182 websites, including research institutes and centers of excellence (IRCCS-teaching hospitals), hospitals and associations. For each registry we downloaded a sample of two trials to assess the correspondence of the data items reported. Results from the Italian and international registries were compared. Results Fifteen percent of the sample had an open-access registry of clinical trials. Comparison of the data items available, in terms of completeness and transparency, from institutional and international registries indicated wide variability. Conclusions Italian citizens, patients and their associations have scant access to local registries of clinical trials, and international registries are generally more informative. On the European level, advocacy and lobby actions are needed among citizens and patients to boost the diffusion of open-access clinical trial registries without language barriers, thereby facilitating participation, access to information, and the coordination of clinical research.
Geografia dos Votos Inválidos na Elei o de 1982 no Estado do Rio de Janeiro
Marina Sant 'Anna,Lucy Freire
Anuário do Instituto de Geociências , 1984,
Abstract:
Urbaniza o e Comportamento Eleitoral
Marina Sant'Anna,Lucy Freire
Anuário do Instituto de Geociências , 1985,
Abstract:
Geografia dos votos nulos e brancos nas elei es de 1962 e 1974 no Estado do Rio de Janeiro
Marina Sant'anna,Lucy Freire
Anuário do Instituto de Geociências , 1983,
Abstract:
Water Stress in Beta vulgaris: Osmotic Adjustment Response and Gene Expression Analysis in ssp. vulgaris and maritima  [PDF]
Paola Vastarelli, Anna Moschella, Daniela Pacifico, Giuseppe Mandolino
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.41003
Abstract: Beta vulgaris genus comprises wild and cultivated subspecies. The “maritima” subspecies is formed by wild or weedy accessions, well adapted to low-water potential environments; it was previously shown that B. vulgaris ssp. maritima has mechanisms of osmotic adjustment more effective than the cultivated B. vulgaris ssp. vulgaris. The response to a progressive lowering of soil potential was compared in two Beta accessions, a cultivated and a wild one. Throughout the 4-months experiment under rain shelters, osmotic potential and relative water content were measured and total RNA was extracted to test the expression of six target genes known in sugar beet or in other plants to be modulated by water shortage. The mild occurrence of drought was paralleled by slow increase in transcription for sucrose synthase 1 and choline monoxygenase, in a way that was in some cases accession-dependent, e.g. the gene for choline monoxygenase was found to be up-regulated at the later stages of growth in stressed plants compared to control ones, and showed a higher constitutive transcription in sea beet compared to sugar beet. Transcription factor DREB2Aalso was slowly induced during the growth season and upon onset of water shortage, and this induction was stronger in sea beet than in sugar beet. In control plants, the transcription of all genes tested except DREB2Awere significantly higher in maritima
Plasma and Red Blood Cells Concentration Profiles of Ktamine after Single Intravenous Administration in an Anaesthetic Protocol in Horses  [PDF]
Francesca Sori, Noemi Romagnoli, Domenico Ferrara, Anna Zaghini, Paola Roncada
Open Journal of Veterinary Medicine (OJVM) , 2013, DOI: 10.4236/ojvm.2013.32022
Abstract:

The aim of this study was to describe the concentration profile of ketamine in plasma and red blood cells following an intravenous (IV) bolus in the horse. Ten healthy standardbred horses (two males and height females) 7.7 ± 4.6 (mean value ± SD) years old and weighting 380 ± 21 kg (mean value ± SD) were recruited. The horses were premedicated with acepromazine (0.04 mg·kg-1·IV). Fifteen minutes later they received romifidine (0.08 mg·kg-1·IV), and 5 minutes after they were administered midazolam (0.06 mg·kg-1·IV). Immediately, anaesthesia was induced by ketamine (2.2 mg·kg-1·IV). Venous blood samples were collected at scheduled time points. Plasma and red blood cells (RBCs) concentration of ketamine was assayed using a high performance liquid chromatographic method (HPLC/UV-DAD). The high mean recovery rates, the high sensitivity, the good linearity, suggest a clinical applicability of the analytical method. A bicompartmental model resulted as the most appropriate to describe the ketamine concentrationtime profile for both plasma and RBCs. The fitted regression line between ketamine plasma concentrations and RBC concentrations supports the good correlation between ketamine concentrations in plasma and in RBCs. The kinetic parameters of ketamine calculated for RBC are equal or very similar to the plasma ones. The study confirms the kinetic behaviour of ketamine used in the horse as anaesthetic inducers in routine surgery. Finally, the bicompartmental model well describes the ketamine profile also in RBCs, that it is very close to

Apoptosis and Skeletal Muscle in Aging  [PDF]
Giuseppe Musumeci, Rosa Imbesi, Marta Anna Szychlinska, Paola Castrogiovanni
Open Journal of Apoptosis (OJApo) , 2015, DOI: 10.4236/ojapo.2015.42004
Abstract: Apoptosis is highly considered as a possible mechanism in the aging process of skeletal muscle. Age-related apoptosis pathways in aging skeletal muscle are several, and apoptotic stimuli considered as initiators could be of various type, such as calcium, TNF-α and oxidative stress. In the last decade, scientific research has focused on some topics in order to establish an appropriate life- style improving the homeostasis of muscle tissue in aging. Physical exercise seems to improve cellular antioxidant defense especially when associated with a good quality of nutrition, thanks to some nutrients, such as carotenoids and oleic acid that have antioxidant properties. A combination of physical exercise, caloric restriction and diet seems to be best strategy to attenuate apoptotic pathways that lead to the loss of skeletal muscle in aging, with all consequence on the physical well-being of the elderly.
Willmore-Helfrich L^{2}-flow of curves with natural boundary conditions
Anna Dall'Acqua,Paola Pozzi
Mathematics , 2012,
Abstract: We consider regular open curves in R^n with fixed boundary points and moving according to the L^{2}-gradient flow for a generalisation of the Helfrich functional. Natural boundary conditions are imposed along the evolution. More precisely, at the boundary the curvature vector is equal to the normal projection of a fixed given vector. A long-time existence result together with subconvergence to critical points is proven.
A control model for zygodactyl bird's foot
Anna Chiara Lai,Paola Loreti
Mathematics , 2014,
Abstract: In this paper we are interested to the zygodactyly phenomenon in birds, and in particolar in parrots. This arrangement, common in species living on trees, is a distribution of the foot with two toes facing forward and two back. We give a model for the foot, and thanks to the methods of iterated function system we are able to describe the reachability set. Moreover we give a necessary and sufficient condition for the grasping problem. Finally we introduce a hybrid dynamical system modeling owl's foot in various stages of hunting (flying, attack, grasp).
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