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Search Results: 1 - 10 of 168281 matches for " Fábio Correia;Araújo "
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Influence of Sub-Lethal and Lethal Concentrations of Chlorhexidine on Morphology and Glucosyltransferase Genes Expression in Streptococcus mutans UA159  [PDF]
Andréa Cristina Barbosa da Silva, Rafael Nóbrega Stipp, Renata de Oliveira Mattos-Graner, Fábio Correia Sampaio, Demetrius Ant?nio Machado de Araújo
Advances in Microbiology (AiM) , 2014, DOI: 10.4236/aim.2014.413105
Abstract: Chlorhexidine (CHX) is regarded as one of the most successful antiplaque agents in controlling the formation of dental biofilm. Nevertheless, molecular mechanisms of their effects in Streptococcus mutans are largely unknown. In this work, the effects of sub-lethal and lethal concentrations of chlorhexidine (CHX) on planktonic or biofilm-organized Streptococcus mutans cells were investigated in dose- and time-dependent manner. The Minimum Inhibitory Concentration (MIC) and the Minimum Bactericidal Concentration (MBC) for planktonic cells and biofilm conditions were determined by standard methods. Quantitative PCR (qPCR) was used to quantify the relative levels of glucosyltransferase B (gtfB), gtfC and gtfD transcription of S. mutans in the presence of CHX. The CHX activity in the initial biofilm structure and morphological alterations in planktonic cells were examined by Scanning Electron Microscopy (SEM). The results indicate that CHX increased expression of gtfC and gtfD in planktonic S. mutans cells and CHX reduced the expression of gtfB, gtfC, and gtfD in biofilms. High concentrations of CHX resulted in several wilted S. mutans planktonic cells with spilled intracellular material, while decreased cells’ chain length and matrix was found when the initial biofilm was exposed to increasing concentrations of CHX. CHX’s effects against bacteria depend on the type of growth organization and the concentration and time of exposure to the drug. At sub-lethal concentrations, CHX affects the expression of glucosyltransferases, which may have anticariogenic effect.
BIORREMEDIA O DE SOLO CONTAMINADO POR óLEO VEGETAL UTILIZANDO A BIOAUMENTA O COM Bacillus subtilis
Ana Carolina Correia de Oliveira,Fábio Fernando de Araújo
Colloquium Exactarum , 2011, DOI: 10.5747/ce.2011.v03.n1.e024
Abstract: The increase in waste generated and disposed of improperly in the environment generates a negative impact in several areas. The recovery time of the site is degraded very high, so it is necessary to use some technique to speed up the process. One of the best techniques is Bioremediation, which uses microorganisms, fungi, algae, plants or their enzymes to degrade pollutants or freeze in a manner that eliminates the danger, or at least minimize. This study aimed to evaluate the technique of bioaugmentation in soil contaminated with vegetable oil, packed in 40 pots in a greenhouse, where they were introduced two strains of B. subtilis (AP-3 and A3-5) multiplied in the laboratory. Were collected from soil samples periodically to monitor the concentration of oil in the soil and to evaluate the enzymatic activities offered by the microorganisms as well as the fresh weight produced by plants.
Fertilidade de cruzamentos, potencial fisiológico e armazenamento de sementes de cana-de-a úcar
Fábio Felix Cabral,Clíssia Barboza Silva,Vilma Marques Ferreira,Jo?o Correia Araújo Neto
Pesquisa Aplicada & Agrotecnologia , 2011, DOI: 10.5777/1437
Abstract: A cana-de-a úcar (Saccharum sp.) é um dos principais produtos agrícolas do Brasil. Para seu cultivo s o utilizados rizomas ou colmos, que permitem reproduzir o mesmo genótipo infinitas vezes. Contudo, em programas de melhoramento genético, a reprodu o sexuada torna-se necessária para produzir novas combina es genéticas e, a utiliza o de sementes constitui a base para obten o de variedades mais produtivas. Neste sentido, este trabalho objetivou avaliar a fertilidade de cruzamentos bi-parentais e múltiplos, envolvendo as variedades RB92579 e RB92606, bem como determinar o potencial fisiológico e de armazenamento das sementes (espiguetas) produzidas. A determina o da fertilidade dos cruzamentos foi realizada por meio da avalia o da percentagem de cariopses produzidas em cada cruzamento e, o potencial fisiológico das sementes pela utiliza o de testes de germina o e vigor. Para avalia o do potencial de armazenamento, as sementes foram mantidas durante seis meses em embalagens de papel tipo Kraft multifoliado, sob camara refrigerada a 21 ± 4,5 °C e umidade relativa do ar de 44 ± 14% e, as avalia es realizadas mensalmente por meio de testes de germina o e vigor. A fertilidade e o potencial fisiológico de sementes de cana-de-a úcar s o fortemente afetados pelo tipo de cruzamento envolvendo as variedades RB92579 e RB92606. O desempenho das sementes, apesar de pequenas oscila es ao longo do tempo, foi conservado durante os seis meses de armazenamento.
Fluorose dentária em crian?as de Princesa Isabel, Paraíba
FORTE, Franklin Delano Soares;FREITAS, Claudia Helena Soares Morais;SAMPAIO, Fábio Correia;JARDIM, Maria Carmen de Araújo Melo;
Pesquisa Odontológica Brasileira , 2001, DOI: 10.1590/S1517-74912001000200002
Abstract: several communities in paraíba have moderate or high levels of fluoride naturally present in the drinking water. a moderate prevalence of dental fluorosis (30-40%) has been observed in some areas where the levels of fluoride are regarded as "optimal" for the region (0.6 ppm). the aim of the present study was to determine the prevalence of dental fluorosis in princesa isabel, a city with "sub-optimal" fluoride levels (0.4 ppm). the sample comprised 142 schoolchildren (10- to 15-year-old subjects) randomly selected and examined by means of the tf (thylstrup & fejerskov) index. the clinical exams were carried out under indirect natural light by three calibrated examiners. prior to the examination the teeth were cleaned and dried. approximately 20% of the subjects examined presented with some degree of fluorosis. seventy per cent were classified as tf 1 while 30% were classified as tf 2 to 5. the prevalence of fluorosis was higher in male subjects and in premolars. although the observed prevalence of dental fluorosis was within the expected levels, other sources of systemic fluoride must be controlled. the observed prevalence of dental fluorosis is not a public health problem in this community.
Fluorose dentária em crian as de Princesa Isabel, Paraíba
FORTE Franklin Delano Soares,FREITAS Claudia Helena Soares Morais,SAMPAIO Fábio Correia,JARDIM Maria Carmen de Araújo Melo
Pesquisa Odontológica Brasileira , 2001,
Abstract: Diversas localidades da Paraíba possuem níveis moderados ou elevados de fluoreto in natura nas águas de abastecimento. Nas áreas onde os níveis de fluoretos s o considerados "ótimos" para a regi o (0,6 ppm), já constatou-se uma moderada prevalência de fluorose dentária (30-40%). O presente trabalho teve por objetivo observar a prevalência de fluorose dentária na cidade de Princesa Isabel, com níveis "subótimos" de fluoretos (0,4 ppm). Foram selecionados aleatoriamente 142 escolares de 10 a 15 anos para o levantamento de fluorose dentária pelo índice TF (de Thylstrup e Fejerskov). Os exames foram realizados por três examinadores previamente calibrados, sob luz natural indireta e após escova o supervisionada e secagem dos elementos dentários. Cerca de 20% dos escolares examinados apresentaram fluorose dentária, sendo que 70% com TF 1 e outros 30% distribuídos em diversos graus (TF 2 a 5). Fluorose foi mais prevalente no sexo masculino e em dentes pré-molares. Embora a fluorose dentária observada esteja dentro dos níveis esperados para o teor de fluoretos (0,4 ppm), outras fontes sistêmicas de fluoretos devem ser controladas. A prevalência de fluorose dentária observada n o é problema de saúde pública nesta localidade.
Detection of oral streptococci in dental biofilm from caries-active and caries-free children
Silva, Andréa Cristina Barbosa da;Cruz, Jader dos Santos;Sampaio, Fábio Correia;Araújo, Demetrius Ant?nio Machado de;
Brazilian Journal of Microbiology , 2008, DOI: 10.1590/S1517-83822008000400009
Abstract: this work correlated the presence of oral streptococci in dental biofilm with clinical indexes of caries and oral hygiene in caries-active and caries-free children. s. mutans and/or s. sobrinus in the dental biofilm does not indicate a direct risk for developing dental caries.
Efeito antibacteriano e antiaderente in vitro do extrato da Punica granatum Linn. sobre microrganismos do biofilme dental
Pereira, Jozinete V.;Pereira, Maria S. Vieira;Sampaio, Fábio C.;Sampaio, Maria C. Correia;Alves, Pollianna M.;Araújo, Cristina R. Ferreira de;Higino, Jane S.;
Revista Brasileira de Farmacognosia , 2006, DOI: 10.1590/S0102-695X2006000100016
Abstract: in this study was evaluated the in vitro antibacterial activity and the inhibition of glucan sintesis of the fruit bark of punica granatum linn extract upon the following dental biofilm bacteria: streptococcus mitis, streptococcus mutans, streptococcus sanguis, streptococcus sobrinus and lactobacillus casei. the tests were carried out by inundation tecniques in petri dishes to determine the minimum inhibitory concentration (mic) and inclined tubes techniques to determine the minimum inhibitory concentration of adherence to glass (mica) at the presence of 5% sucrose. tests with gluconate of chlorexidine (0.12%) were performed as controls. mics of the p granatum extract dilutions (mg/ml) against s. mitis, s. mutans, s. sanguis, s. sobrinus e l. casei were 1:32, 1:8, 1:8, 1:512, and 1:128 respectively. for micas the p. granatum showed better results than chlorexidine, except for s. mutans with both substances showing similar results of 1:256. it can be concluded that the extract of the p. granatum has the potential to inhibit oral bacterial growth and glucan sintesis. the extract of the punica granatum might be used as an effective antibacterial alternative agent against oral biofilm bacteria.
Evaluation of an oral health program for children in early childhood
Siqueira, Maria de Fátima Gabínio de;Jardim, Maria Carmen de Araújo M.;Sampaio, Fábio Correia;Vasconcelos, Laurylene César de S.;Vasconcelos, Laís César de;
Revista Odonto Ciência , 2010, DOI: 10.1590/S1980-65232010000400005
Abstract: purpose: to evaluate an educative and oral health promotion program for children from three public daycare facilities in the city of jo?o pessoa (pb), in the northeastern region of brazil. methods: sample was composed of 219 children who were divided into four age groups: 0 to 12, 13 to 24, 25 to 36 and 37 to 48 months. all children were submitted to clinical exams and preventive procedures of hygiene and topical application of fluoride at 3-month intervals during 12 months. mothers were given instructions of oral hygiene of their children. the dmft index and the presence of active white spots (aws) were recorded. results: mean (sd) values of the initial and final dmft were 0.65 (1.3) and 0.72 (1.5), respectively (p<0.05). the initial and final numbers of aws were 44 and 08, respectively. the absence of nocturnal hygiene was associated with aws for children that received nocturnal breast-feeding. the most relevant variables for dental caries development were: age group, absence of nocturnal oral hygiene and nocturnal breast-feeding; for aws only the absence of nocturnal oral hygiene was significant (p<0.05). conclusion: this oral health program showed to be effective in the maintenance of oral health. the most relevant risk factors for dental caries were absence of nocturnal oral hygiene and nocturnal breast-feeding.
O Postulado do Usuário: incentivo ao desenvolvimento da Teoria da Contabilidade e do Contabilista
Pinheiro, Fábio Araújo;
Caderno de Estudos , 1997, DOI: 10.1590/S1413-92511997000300004
Abstract: este artigo abordou a sugest?o de novo postulado para a ciência contábil: o postulado do usuário. sua cria??o se faz necessária para desenvolver a teoria da contabilidade e parar a perda de relevancia dos contabilistas. parece inegável que os profissionais da contabilidade n?o conseguem satisfazer todos os sues clientes, fazendo com que a própria contabilidade caia em descrédito. há necessidade da contabilidade voltar-se para o usuário, seguindo a uma tendência da economia mundial, e fomentar a mudan?a na postura do contabilista.
Com as patas dos cavalos: a criminaliza o dos pobres e das lutas sociais
Fábio Alves Araújo
Geografares , 2006,
Abstract: Com as patas dos cavalos:a criminaliza o dos pobres e das lutas sociaisA incapacidade do Estado neoliberal de resolver as quest es sociais produziu uma forma penal de gest o da pobreza. A conten o punitiva dos deserdados tornouse palavra de ordem das políticas sociais. Neste sentido, tem ocorrido um processo de criminaliza o dos pobres e das lutas sociais em que os servi os públicos s o transformados em servi os de controle, vigilancia e repress o. No Brasil, um dos principais alvos da criminaliza o tem sido o Movimento Sem-Terra (MST).
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