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Search Results: 1 - 10 of 180820 matches for " Jo?o Ant?nio da Costa;Bonfim "
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Compara??o da eficiência de três materiais na sor??o e difus?o dos íons metálicos através de ensaios experimentais e simula??o computacional
Lacerda, Cláudia Virgínia;Castro, José Adilson de;Ritter, Elisabeth;Pires, Joo Antnio da Costa;Bonfim, Adriana Moreira;
Rem: Revista Escola de Minas , 2011, DOI: 10.1590/S0370-44672011000500012
Abstract: the present study aims to quantify basic parameters for the transport and retention of metal ions in contention barrier systems. a synthetic leachate with ph 1 and known concentrations of ions chromium, cadmium and copper was used. sorption and molecular diffusion experiments were carried out in compacted soil, soil mixture with 10% sodium bentonite and compacted soil overlaid with geomembrane. it was implemented in the program mphmtp (multi phase heat and mass transfer program) where the equations describe ion behavior under adjusted parameters obtained from sorption and diffusion tests. the geomembrane’s presence minimizes ion migration through a diffusive process, and eliminates the need for the soil sorption capacity. but the soil with the bentonite option proved to be the most predominant specific alternative due to its cadmium sorption capacity.
Crescimento e micorriza??o de genótipos de milho em casa de vegeta??o
Campos, Daniela Tiago da Silva;Andrade, Joo Antnio da Costa;Cassiolato, Ana Maria Rodrigues;
Bragantia , 2010, DOI: 10.1590/S0006-87052010000300006
Abstract: this study was conducted in a greenhouse, with the objective of comparing the growth and mycorrhization of nine corn genotypes and the colonization by autoctonous arbuscular mycorrhizal fungi (amf), in addition to the amf soil inoculum potential. soil was collected on a degraded pasture (originally a 'cerrado' area), fertilized, mixed with river sand, fumigated and placed in 3-kg plastic bags. five seeds of each corn genotype were seeded in 20 bags, but only 10 received solution with 300 amf spores ca., collected from the pasture soil. each bag, containing one single plant, composed a replication. the plant height and stem diameter were evaluated in 15, 30, 45 and 60 days after seeded, plus dry matter weight of roots and canopy, colonization and mycorrhizal dependency. on the same period, the second experiment was prepared to evaluate the soil potential of fma of pasture soil, with serial dilution of 90, 80, 70, 60, 50, 40, 30, 20 and 10%, including only no sterilized soil (100%) and only sterilized soil (0%), on plastic bags, seeded with tractor hybrid. after 60 days, roots were collected to quantify the col. inoculation of amf resulted in a differential increase of dry matter, with highest values of dry matter weight of canopy were found on the genotypes condá, f0, d1 and f8 and lowest weight of roots for genotypes tractor and d7. the genotypes showed no response or low response to the mycorrhyzae, and exhibited different response to colonization, with the averaging of 60% for condá, sol da manh?, f0 and d1. the pasture area, even degraded, showed a high soil inoculum potential, presenting high root colonization percentage by fma.
Potenciais produtivo e genético de clones de batata-doce
Cavalcante, Marcelo;Ferreira, Paulo Vanderlei;Paix?o, Stênio Lopes;Costa, Joo Gomes da;Pereira, Rodrigo Gomes;Madalena, José Antnio da Silva;
Acta Scientiarum. Agronomy , 2009, DOI: 10.4025/actasciagron.v31i3.835
Abstract: with the objective to evaluate the yield and genetic potential of sweet potato clones, aiming at the selection of more productive genetic material, with traits that facilitate tillage, an experiment was conducted in 2007, composed of nine clones and two local varieties, in a completely randomized block design with three replications. six traits of the shoot and four traits of the storage roots were evaluated. clone 6 had the highest marketable root yield, with 12.08 t ha-1. clones 8, 14 and the "rainha prata" variety had the highest shoot phytomass yield, with 5.42, 5.17 and 5.83 t ha-1, respectively. clone 11, in addition to producing 9.08 t ha-1 of marketable root and 4.02 t ha-1 of shoot phytomass, also featured favorable internode length and diameter for the practice of tillage. marketable root and shoot yield and the length of internode presented the highest and favorable σ2g and σ2e, cvg, h2 and variation index (b) to obtain satisfactory genetic gains from the selection. thus, clones 6 and 11 presented interesting traits that could be exploited by selective techniques in future stages of breeding program of this culture.
DETERMINANTES E CONSEQUêNCIAS DO FECHAMENTO DE CAPITAL NAS PRáTICAS DE GERENCIAMENTO DE RESULTADOS
Joo Antnio Salvador de Souza,Wando Belffi da Costa,José Elias Feres de Almeida,Patrícia Maria Bortolon
Revista Evidencia??o Contábil & Finan?as , 2013,
Abstract: A literatura estrangeira que investiga os incentivos e determinantes do fechamento de capital das companhias abertas é fortemente concentrada no ambiente norte-americano, sendo no Brasil pouco investigados. Este artigo tem como objetivo analisar os efeitos do fechamento de capital nos incentivos às práticas de gerenciamento de resultados de empresas brasileiras, levando em considera o os motivos divulgados pelas empresas. A amostra do estudo é composta pelas companhias abertas brasileiras listadas na BM&FBOVESPA que fecharam seu capital no período entre 2000 e 2012, conforme motivos divulgados (processo de incorpora o ou voluntário) em cada evento de fechamento no website da BM&FBOVESPA. Foram utilizadas duas métricas de gerenciamento de resultados para capturar diferen as de comportamento dos números contá-beis, os accruals discricionários e a suaviza o de resultados, através dos modelos KS (1995) e Eckel (1981), respectivamente. Para aumentar a robustez dos resultados duas amostras de em-presas foram usadas para controlar os efeitos do fechamento, chamadas de matched samples, a primeira composta por empresas comparáveis (empresas do mesmo setor e com tamanho do ativo total semelhante) e a segunda amostra utilizando todas as companhias abertas. As evidên-cias indicam que o fechamento de capital, em geral, influencia as práticas de gerenciamento de resultados, entretanto, n o de maneira diferente pelos motivos investigados (voluntário ou incorpora o). Adicionalmente, existem evidências fracas de que tamanho da firma, endivida-mento e estrutura de propriedade influenciam o gerenciamento de resultados. Os resultados contribuem para orientar reguladores, analistas, profissionais de mercado e investidores no monitoramento das atividades das empresas e das escolhas contábeis dos executivos.
Leucoplasias bucais: rela??o clínico-histopatológica
RODRIGUES, Tania Lemos Coelho;COSTA, Lino Joo da;SAMPAIO, Maria Carmeli Correia;RODRIGUES, Fabiano Gonzaga;COSTA, Antnio de Lisboa Lopes;
Pesquisa Odontológica Brasileira , 2000, DOI: 10.1590/S1517-74912000000400009
Abstract: the relation between the clinical aspects and histologic characteristics of oral leukoplakias was evaluated on 28 adult patients presenting with oral leukoplakia. the lesions were clinically classified as homogeneous and nonhomogeneous, and divided regarding their histopathologic characteristics in six groups: hyperkeratosis without epithelial dysplasia; mild epithelial dysplasia; moderate epithelial dysplasia; severe epithelial dysplasia, squamous cell carcinoma in situ and invasive carcinoma. homogeneous leukoplakia comprised 78.6% of the cases and nonhomogeneous, 21.4%. microscopically, 32.2% of the lesions disclosed hyperkeratosis without evidences of epithelial dysplasia, 53.5% epithelial dysplasia (39.3% mild, 7.1% moderate, and 7.1% severe) and 14.3% invasive carcinoma. homogeneous leukoplakia showed discreet histologic changes, while nonhomogeneous lesions evidenced histologic characteristics of severe epithelial dysplasia and even of invasive carcinoma. the results suggest great precaution in the diagnosis and follow-up of leukoplakia, considering the possibility of malignant transformation.
Relationship between files that bind at the apical foramen and foramen openings in maxillary central incisors - a SEM study
Souza, Ronaldo Araújo;Sousa, Yara T. Corrêa Silva;Figueiredo, José Antnio Poli de;Dantas, Joo Da Costa Pinto;Colombo, Suely;Pécora, Jesus Djalma;
Brazilian Dental Journal , 2011, DOI: 10.1590/S0103-64402011000600003
Abstract: considering that instrumentation of the apical foramen has been suggested for root canal infection control, this study analyzed the relationship between the files that bind at the apical foramen and the foraminal openings in 50 maxillary central incisors. after preparation of the pulp chamber, access to the canal was obtained with #1 and 2 la axxess and k-files with tip cut were inserted up to the apical foramen until binding was felt. the files were fixed with methyl cyanoacrylate and the tooth-file sets were cross-sectioned 10 mm short of the apex. scanning electron microscopic analysis was carried out and files and foraminal areas were measured using image tool software. statistically significant difference (p<0.0001) was found between files and the apical foraminal areas. the mean foraminal area was 3.8 times larger than the mean file area. the results of this study suggest that it would require 4 files of greater size beyond the one that bound to the foramen in order to allow a better relationship between files and apical openings of maxillary central incisors.
Influence of apical foramen lateral opening and file size on cemental canal instrumentation
Souza, Ronaldo Araújo;Sousa, Yara T. Corrêa Silva;Figueiredo, José Antnio Poli de;Dantas, Joo da Costa Pinto;Colombo, Suely;Pécora, Jesus Djalma;
Brazilian Dental Journal , 2012, DOI: 10.1590/S0103-64402012000200006
Abstract: since instrumentation of the apical foramen has been suggested for cleaning and disinfection of the cemental canal, selection of the file size and position of the apical foramen have challenging steps. this study analyzed the influence of apical foramen lateral opening and file size can exert on cemental canal instrumentation. thirty-four human maxillary central incisors were divided in two groups: group 1 (n=17), without flaring, and group 2 (n=17), with flaring with la axxess burs. k-files of increasing diameters were progressively inserted into the canal until binding at the apical foramen was achieved and tips were visible and bonded with ethyl cyanoacrylate adhesive. roots/files set were cross-sectioned 5 mm from the apex. apices were examined by scanning electron microscopy at ×140 and digital images were captured. data were analyzed statistically by student’s t test and fisher’s exact test at 5% significance level. sem micrographs showed that 19 (56%) apical foramina emerged laterally to the root apex, whereas 15 (44%) coincided with it. significantly more difficulty to reach the apical foramen was noted in group 2. results suggest that the larger the foraminal file size, the more difficult the apical foramen instrumentation may be in laterally emerged cemental canals.
Classes sociais na Europa
Costa,António Firmino da; Mauritti,Rosário; Martins,Susana da Cruz; Machado,Fernando Luís; Almeida,Joo Ferreira de;
Sociologia, Problemas e Práticas , 2000,
Abstract: o actual contexto de globaliza??o coloca novas quest?es à análise das rela??es de classe. clarificando o posicionamento teórico e as possibilidades operatórias da actual sociologia das classes sociais e da estratifica??o, o presente artigo procura dar contributos para essa análise, procedendo a um exame comparativo, no ambito da uni?o europeia, de um conjunto seleccionado de indicadores de recomposi??o social. um dos principais eixos da análise prende-se com o confronto entre parametros nacionais e globais de estrutura??o das rela??es de classe.
Proposi??o de um escore de risco cirúrgico em pacientes submetidos à cirurgia de revasculariza??o miocárdica
Cadore, Michel Pereira;Guaragna, Joo Carlos Vieira da Costa;Anacker, Justino Fermin Amonte;Albuquerque, Luciano Cabral;Bodanese, Luiz Carlos;Piccoli, Jacqueline da Costa Escobar;Petraco, Joo Batista;Goldani, Marco Antnio;
Revista Brasileira de Cirurgia Cardiovascular , 2010, DOI: 10.1590/S0102-76382010000400007
Abstract: introduction: scores to predict surgical risk in patients submitted to myocardial revascularization surgery are broadly used. objective: to develop a score capable to predict mortality in patients submitted to myocardial revascularization surgery. methods: from january 1996 to december 2007, data were collected from 2809 patients submitted to myocardial revascularization surgery at puc-rs s?o lucas hospital. in 2/3 of the sample (n=1875), the score was developed, after uni and mutivariated analyses. in the remaining 1/3 (n =934) the score was validated. the final score was developed with the total sample, using the same variables (n=2809). the accuracy of the model was tested using the area under the roc curve. results: the mean age was 61.3 ±10.1 years and 34% were women. the risk factors identified as independent predictors of surgical mortality and used for score development (parentheses) were: age > 60 years (2), female (2), extracardiac vasculopathy (2), heart failure functional class iii and iv (3), ejection fraction<45% (2), atrial fibrillation (2), chronic obstructive pulmonary disease (3), aortic stenosis (3), creatinine 1.5-2.4 (2), creatinine > 2.5 or dialysis (4), emergency/urgency surgery (16). the area obtained under the roc curve was 0.86 (ci 0.81-0.9). conclusion: the score developed, using clinical variables easy to obtain (age, sex, extracardiac vasculopathy, functional class, ejection fraction, atrial fibrillation, chronic obstructive pulmonary disease, aortic stenosis, creatinine and emergency/urgency surgery) showed capability to predict mortality in patients submitted to myocardial revascularization surgery in our hospital.
Caracteriza??o microbiológica de lixiviados gerados por resíduos sólidos domiciliares e de servi?os de saúde da cidade do Rio de Janeiro
Silva, Carlos Augusto Machado da Costa e;Campos, Juacyara Carbonelli;Ferreira, Joo Alberto;Miguel, Marco Antnio Lemos;Quintaes, Bianca Ramalho;
Engenharia Sanitaria e Ambiental , 2011, DOI: 10.1590/S1413-41522011000200005
Abstract: the present paper consisted on the microbiological characterization of leachate generated from solid waste from health services and municipal solid waste. this study aimed to support the discussion about the need for differentiated treatment and disposal for the health services solid waste. the following parameters were selected: total coliforms, thermotolerant coliforms, escherichia coli, enterococci, trials for pseudomonas aeruginosa, and salmonella and other enterobacteria, analysis of susceptibility to antimicrobials and research on antimicrobial activity of the leachate. expressive densities were observed in microbial populations in health services and municipal solid waste, with values ranging from 108 to 109. in both wastes, resistant and susceptible strains to antimicrobials occurred and none were resistant to all antibiotics tested. results showed similarities for both types of waste and reinforce the recommendation for health services and municipal solid waste co-disposal in sanitary landfills.
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