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Search Results: 1 - 10 of 245049 matches for " Helena Maria Santos de Oliveira "
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Bond Strength of Brackets Bonded with Chemically and Light Activated Materials after Thermal Cycling  [PDF]
Rafael Menezes-Silva, Leonardo Amaral dos Reis, Bhenya Otonni Tostes, Dhelfeson Willyan Douglas de Oliveira, Maria Helena Santos
Advances in Materials Physics and Chemistry (AMPC) , 2015, DOI: 10.4236/ampc.2015.59035
Abstract: The aim of this study was to evaluate the bond strength of orthodontic brackets bonded to tooth enamel with different polymer composites after simulated clinical aging, and analyze the enamel/ bond system fracture interface. 80 human premolars, were randomly divided into five groups (n = 16). G1: CO (Concise Ortodontica—3M ESPE), G2: SB (SuperBond—Ortho Source), G3: FMO (Fill Magic OrtodonticoVigodent), G4: TXT (Transbond XT—3M ESPE) and G5: TP (Transbond Plus Self Etching Primer + Transbond Plus Color Change—3M ESPE). In all groups, the metal orthodontic bracket was bonded to the tooth enamel surface. The specimens were submitted to 3000 thermal cycling baths for 30 s, at temperatures of 5°C, 37°C and 55°C (±1°C). Afterwards they were subjected to shear testing and the results were analyzed by the Student’s-t test (p < 0.05). G1 presented the highest bond strength value, followed by G4 > G5 > G2 > G3. In all groups the majority of the fractures at the interface of the specimens were cohesive, except in G3, which presented the largest number of adhesive fractures. After clinical aging, the chemically activated material (CO) showed higher bond strength than the light activated types (FMO, TXT and TP). The self-etching adhesive system (TP) showed similar bond strength to that of conventional systems (FMO and TXT).
A forma??o prática de professores no estágio curricular
Felício, Helena Maria dos Santos;Oliveira, Ronaldo Alexandre de;
Educar em Revista , 2008, DOI: 10.1590/S0104-40602008000200015
Abstract: based on the premise that the practical dimension must be considered in the initial training of teachers, we understand that curricular training, if well founded, structured and oriented, is relevant to the curricular outlook of the practical training process for future teachers. this article presents some reflections and discussions, stemming from a qualitative investigation, about the importance of the role of curricular training in the practical preparation of the students. the subjects of this research are students who have finished the teacher training course at the university of paraíba valley (univap). based on the interpretation of different authors (lima, 2001; tardif, 2002; pimenta, 2001; gómez, 2000), we understand practice as praxis, since, in being permeated by a process of reflection, it can be constructed and reconstructed, with a view of transforming the school. thus we see the practical learning considered to have been achieved during the training in the reports presented and in the students' discourse. we analyze the data collected, in the light of the theory studied on the practical and professional training of teachers. we identify the favorable and unfavorable aspects of practical curricular training from the space/time point of view, which is also intended to promote practical knowledge in teacher training. finally, we propose new perspectives for the orientation and execution of practical curricular training of teachers, centered on the relevance of practical training and on the articulation of all the disciplines on the training course.
Uso de cobertura com colágeno e aloe vera no tratamento de ferida isquêmica: estudo de caso
Oliveira, Simone Helena dos Santos;Soares, Maria Julia Guimar?es Oliveira;Rocha, Pascalle de Sousa;
Revista da Escola de Enfermagem da USP , 2010, DOI: 10.1590/S0080-62342010000200015
Abstract: the present study is a clinical case report of a patient with diabetes and hypertension, with an ischemic wound, treated with a non-conventional aloe vera and collagen plastering. this study is part of an experimental research project, coordinated by professors and nurses that work together to discover new ways for wound treatment. this case was chosen among many patients. data was collected through anamneses and physical examination of the patient's condition, the wound, and pictures were taken. the plastering was applied every day, and by the end of ten weeks, total healing was obtained. there was no discomfort or any other implication as a result of using the compound. in conclusion, the compound was well accepted and efficient in this particular case.
Synthesis and characterization of thermo-responsive particles of poly(hydroxybutirate-co-hydroxyvalerate)-b-poly(N-isopropylacrylamide)
Oliveira, Adriano Marim de;Oliveira, Pedro Carlos de;Santos, Amilton Martins dos;Zanin, Maria Helena Ambrosio;Ré, Maria Inês;
Brazilian Journal of Physics , 2009, DOI: 10.1590/S0103-97332009000200015
Abstract: a new kind of thermo-responsive particles were prepared by the self-assembly technique, comprising poly(hydroxyvalerate-co-hydroxybutirate)-b-poly(n-isopropylacrylamide)/ (phbhv-b-pnipaam) block copolymers. the hydrophilic part pnipaam was synthesized by reversible addition- fragmentation chain transfer (raft) polymerization. particles with core-shell morphology were obtained with hydrophilic outer shells and hydrophobic inner cores. dexametasone acetate (dexac) was used as a model drug with an encapsulation efficiency of 77%. the release of dexac in aqueous solution was strongly dependent on temperature, suggesting that phbhv-b-pnipaam particles can be used as a thermo-responsive carrier material with external control in a drug release system.
Effect of Cr(V) on reproductive organ morphology and sperm parameters: An experimental study in mice
Maria Pereira, Ricardo das Neves, Helena Oliveira, Teresa Santos, Júlio de Jesus
Environmental Health , 2005, DOI: 10.1186/1476-069x-4-9
Abstract: Eight-week-old animals were subcutaneously injected daily with a dose of ca 8 μmol of Cr/mouse, during 5 days. The control group was injected with 0.5 mL of BT buffer. Testis and epididymis morphology was evaluated using light and transmission electron microscopy. Epididymal sperm counts, motility and acrosome integrity were also assayed using standard methods.Seminiferous epithelium abnormalities were detected in the CrV-BT experimental group, including intraepithelial vacuolation, and remarkable degeneration of Sertoli cells, spermatocytes and spermatids. The premature release of germ cells into the tubular lumen was also evident. Histological evaluation of epididymal compartments revealed apparently normal features. However, the epididymal epithelium presented vacuolation. [CrV-BT]2- induced a reduction in sperm acrosome integrity. However, sperm motility and density were not significantly affected.This in vivo study using a Cr(V) compound, provides evidence for the potential reproductive hazards caused on male reproductive system by species containing chromium in intermediate oxidation states.Cr(VI) compounds have been declared potent occupational carcinogens by IARC [1]. Although the first report on the development of lung cancer in the chrome ore industry appeared ca 80 years ago [2], several epidemiological studies among workers of almost one hundred different professional categories (chrome plating, stainless-steel welding, pigment and leather tanning) were published since [3-5]. Numerous and different in vitro and/or in vivo studies have been undertaken either in animals or in humans and today it is known that there is a close relationship between workers health and the amounts of industrial pollution provoked by industries manufacturing chromium containing materials [1,6,7].Cytotoxicity and carcinogenicity of Cr(VI) depend on intracellular reduction towards stable and inert Cr(III) compounds [8,9]. During this process Cr(V) and Cr(IV) intermediate states h
Constituintes polares das folhas de Machaonia brasiliensis (Rubiaceae)
Santos Anderson Rogério dos,Barros Michely Pereira de,Santin Silvana Maria de Oliveira,Sarragiotto Maria Helena
Química Nova , 2004,
Abstract: Chemical investigation of the MeOH extract of the leaves of Machaonia brasiliensis (Rubiaceae) resulted in the isolation and identification of 3beta-O-beta-glucopyranosyl stigmasterol, 3beta-O-beta-glucopyranosyl sitosterol, secologanoside, 7-O-beta-glucopyranosyl quercetagetin, 4,5-O-dicaffeoylquinic acid and 5-O-caffeoylquinic acid. The structures of these compounds were established by spectroscopic analysis, including 2D NMR experiments. The chemotaxonomic relevance of the isolation of secologanoside is discussed.
In Vitro Evaluation of Gamma Irradiation on a Gel Formulation of Cratylia Mollis: Rheological Proporties and Microbiological Control  [PDF]
Maria Helena Madruga Lima-Ribeiro, Ralph Santos-Oliveira, Mauricélia Firmino de Santana, Terezinha de Jesus Andreoli Pinto, Irene Satiko Kikuchi, Cheila Gon?alves Mothé, Luana Cassandra Breitenbach Barroso Coelho, Maria Tereza dos Santos Correia, Ana Maria dos Anjos Carneiro-Le?o
Journal of Cosmetics, Dermatological Sciences and Applications (JCDSA) , 2012, DOI: 10.4236/jcdsa.2012.22011
Abstract: Lectin Cramoll-1,4, obtained from Cratylia mollis seeds (beans camaratu) was structurally characterized, biologically and pharmacologically, but its use as a biopharmaceutical is not well documented. The objective of this study is to propose a biopharmaceutical formulation lectin Cramoll-1,4, test their hemagglutinating properties in vitro as well as the use of gamma radiation as a continuous process of decontamination formulation. It was made of the extraction and purification Cramoll-1,4, was developed a gel formulation using Carbopol? as a vehicle, at concentrations of 50, 100, 200, 300 and 600 μg was irradiated with 60Co gamma rays in a dose of 7.549 kGy·h–1. The proposed formulation at a concentration of 300 μg produced an increase in the hemagglutinating units Cramoll-1,4 due to the synergistic effect caused by gamma radiation. Considering the diverse use of lectins, specific molecular and structural factors, as well as changes resulting from its formulation, concentration, irradiation and route of administration is of utmost importance to continue the studies in vitro, for subsequent application in vivo to characterize the physiological and molecular processes involved in the response and cellular effects.
Adolescentes em sofrimento psíquico e a política de saúde mental infanto-juvenil
Santos, Danielle Christine Moura dos;Jorge, Maria Salete Bessa;Freitas, Consuelo Helena Aires de;Queiroz, Maria Veraci Oliveira;
Acta Paulista de Enfermagem , 2011, DOI: 10.1590/S0103-21002011000600020
Abstract: this study is a literature review of published articles about the mental health of adolescents in brazil, between january 2005 and april 2010. the keywords used in lilacs and scielo databases were: mental health, adolescents, care, and outcomes of care. thirty-five articles were analyzed, using the technique of content analysis. studies show it is essential to recognize that the adolescent suffering psychologically is a subject and that he lives in a subjective context. in this way, the proposals of transformation will not have the necessary reach to the needs and demands of those individuals without an effective articulation between the diverse sectors, health care workers, patients and family. in this debate, there are few publications that discuss the new experiences, the dimension of the clinical act, expanded clinics or the output of the care in the attention to the mental health of these subjects.
Helena Maria Santos de Oliveira,Cláudia Maria Ferreira Pereira Lopes,Carlos Alberto da Silva e Cunha
Revista Universo Contábil , 2008,
Abstract: Neste trabalho, efectuamos uma revis o de literatura sobre a relevancia da transparência da informa o financeira por parte dos emitentes de valores mobiliários admitidos à negocia o em mercados regulamentados que se situem nos Estados membros da Uni o Europeia. Desta resulta consensual que a transparência nas demonstra es financeiras (DF) é uma quest o cada vez mais fundamental dada a forte internacionaliza o das empresas e globaliza o dos mercados, afectando o fluxo de capitais e o próprio desenvolvimento dos mercados financeiros. A Directiva 2004/109/CE do Parlamento Europeu e do Conselho, de 15 de dezembro de 2004, reflecte a preocupa o dos Estados membros em harmonizar os requisitos e critérios de transparência, particularmente no seguimento da Directiva 2003/34/CE, sobre os Prospectos, no que se refere às informa es respeitantes aos emitentes de valores mobiliários. Esta quest o da transparência foi também muito impulsionada pela promulga o da Sarbanes-Oxley Act. In this work, we review some of the literature that deals with the relevance of the transparency of financial information disclosed by firms whose stock is traded on regulated financial markets located in the European Union. From this review it is agreed that the transparency of financial reports is becoming an increasingly important question since the internationalization of firms and globalization of markets are becoming stronger. These situations affect capital flow and the development of financial markets. Directive 2004/109/CE of the European Parliament and Council, issue on 15th December 2004, shows the preoccupation of European Members about the use the of criteria for transparency, namely in following the 2003/34/CE Directive, related with the Prospectus, in the case of firms that have issued stock. The importance of transparency also increases with the Sarbanes-Oxley Act.
Synthesis control and characterization of hydroxyapatite prepared by wet precipitation process
Santos, Maria Helena;Oliveira, Marise de;Souza, Luciana Palhares de Freitas;Mansur, Herman Sander;Vasconcelos, Wander Luiz;
Materials Research , 2004, DOI: 10.1590/S1516-14392004000400017
Abstract: several techniques have been utilized for the preparation of hydroxyapatite (ha) and other calcium phosphates for the development of biomaterials. it is vital to know the reaction kinetics to be able to control the material obtained by the aqueous solution route. in the present work, ha has been produced by different wet precipitation processes and different experimental conditions. calcium hydroxide, calcium phosphate, ammonium phosphate and phosphoric acid were used as reagents. the precipitate was dried at 100 °c overnight and then some samples were treated at 900 °c for 2 h. the powder samples were characterized by scanning electron microscopy (sem), x-ray fluorescence (xrf) and x-ray diffraction (xrd) analyses. sem photomicrographs showed an aggregate powder, granular to dense and suggested typical columnar particles. qualitative xrf showed that the main components of ha powders were calcium and phosphorus. pure ha and other phases according to processing parameters were observed by xrd analysis.
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