oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 112 )

2019 ( 584 )

2018 ( 665 )

2017 ( 660 )

Custom range...

Search Results: 1 - 10 of 418262 matches for " José Francisco S.;Oliveira "
All listed articles are free for downloading (OA Articles)
Page 1 /418262
Display every page Item
High Resolution Mass Spectrometry Elucidation of Captopril’s Ozonation and Chlorination By-Products  [PDF]
Frederico Jehár Oliveira Quint?o, Geraldo Célio Brand?o, Silvana de Queiroz Silva, Sérgio Francisco Aquino, Robson José de Cássia Franco Afonso
American Journal of Analytical Chemistry (AJAC) , 2017, DOI: 10.4236/ajac.2017.84020
Abstract: The article evaluated the degradation of the captopril in aqueous solution after ozonation and chlorination. The process was continuously monitored focusing on the identification, mass spectrometry and elucidation of its by-products by applying direct infusion and high performance liquid chromatography, electrospray ionization high resolution mass spectrometry, in the negative ion mode. The cytotoxicity of its by-products solutions were evaluated with 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT) assay. It was observed through that after 30 min of ozonation and chlorination, there was complete oxidation of captopril, i.e., 100% removal efficiency. At these conditions, the rate of mineralization, by total organic carbon, was only 7.63% for ozonation and 6.40% for chlorination, evidencing the formation of degradation by-products. Ten captopril by-products were identified and their respective chemical structures elucidations are proposed. The treated samples and their by-products were nontoxic to HepG2 cells by MTT assay.
Influência do tamanho da amostra na estimativa da riqueza em espécies em levantamentos de abelhas silvestres (Hymenoptera, Apoidea)
Cure, José Ricardo;Bastos Fo., Guilherme S.;Oliveira, Ma. José Faccini de;Souza, Og Francisco de;
Revista Brasileira de Zoologia , 1990, DOI: 10.1590/S0101-81751990000200010
Abstract: the effect of area size, number of collecting hours and months surveyed, on the estimation of relative richness of bees is analized. in order to characterize a biogeographical region, it is suggested to collect various samples of no less than 400 especimens for each one, in contrasting localities within a region, utilizing the usual standardized methodology for wild bees collecting. thus, it is possible to have a better profit of the effort invested in the survey, making it possible to estimate the relative species richness among different biogeographical regions, in shorter periods of time.
Locus de controle em uma popula o do nordeste brasileiro
Vera Noriega José ángel,Albuquerque Francisco José Batista de,Laborín Alvarez Jesús Francisco,Oliveira Liana Mirela Souza
Psicologia: Teoria e Pesquisa , 2003,
Abstract: Estabeleceu-se como objetivo principal desse trabalho realizar compara es inter e intragrupo com rela o ao locus de controle em um setor da cultura nordestina (Paraíba) do Brasil e cotejar esses resultados com aqueles auferidos em uma cultura mexicana, mais especificamente do deserto de Sonora. Para tanto, definiu-se como objetivo específico analisar as propriedades psicométricas de um instrumento para avaliar locus de controle. Contou-se com uma amostra de 600 sujeitos divididos por quotas de idade e gênero, formando três grupos de idade (100 mulheres e 100 homens em cada um): 14-22; 23-35 e 36-70 anos. Foram realizadas estatísticas descritivas por cada item, teste T de Student para analisar o poder discriminativo de cada um, análises fatoriais, índices de consistência interna (correla o de Pearson). Utilizou-se a escala de locus de controle de Reyes (1995), validada com dados obtidos na popula o mexicana, composta de 78 itens, com sete op es de resposta apresentadas na forma tipo Likert pictórico. A análise fatorial indicou a presen a de quatro fatores que conformam uma nova escala com 71 itens, que em seu conjunto explicam 36,2% da variancia total, apresentando um alpha de 0,93. Os resultados permitem concluir pela validade da escala, cuja utilidade está assegurada para as situa es em que foi avaliada.
Fracture resistance of weakened teeth restored with condensable resin with and without cusp coverage
Mondelli, Rafael Francisco Lia;Ishikiriama, Sérgio Kiyoshi;Oliveira Filho, Otávio de;Mondelli, José;
Journal of Applied Oral Science , 2009, DOI: 10.1590/S1678-77572009000300006
Abstract: objectives: this in vitro study evaluated the fracture resistance of weakened human premolars (mod cavity preparation and pulp chamber roof removal) restored with condensable resin composite with and without cusp coverage. material and methods: thirty human maxillary premolars were divided into three groups: group a (control), sound teeth; group b, wide mod cavities prepared and the pulp chamber roof removed and restored with resin composite without cusp coverage; group c, same as group b with 2.0 mm of buccal and palatal cusps reduced and restored with the same resin. the teeth were included in metal rings with self-curing acrylic resin, stored in water for 24 h and thereafter subjected to a compressive axial load in a universal testing machine at 0.5 mm/min. results: the mean fracture resistance values ± standart deviation (kgf) were: group a: 151.40 ± 55.32, group b: 60.54 ± 12.61, group c: 141.90 ± 30.82. statistically significant differences were found only between group b and the other groups (p<0.05). the condensable resin restoration of weakened human premolars with cusp coverage significantly increased the fracture resistance of the teeth as compared to teeth restored without cusp coverage. conclusion: the results showed that cusp coverage with condensable resin might be a safe option for restoring weakened endodontically treated teeth.
Crescimento, produ??o e absor??o de nitrogênio do alho proveniente de cultura de tecidos, cultivado com doses elevadas de nitrogênio
Resende, Francisco V;Oliveira, Paulo Sérgio R. de;Souza, Rovilson José de;
Horticultura Brasileira , 2000, DOI: 10.1590/S0102-05362000000100007
Abstract: this work was accomplished in marília county, state of s?o paulo - brazil, with the objective of studying the growth, production, n uptake and correlations between these characteristics, on tissue culture garlic cultivated under high nitrogen levels. five levels of n were used: 0, 80, 140, 200 and 250 kg/ha in a randomised block design with four replications. the number of leaves per plant and the bulbing ratio increased under high n levels in the soil. the plant height and dry matter accumulation showed a quadratic response, reaching maximum values at n levels of 180 and 164 kg/ha, respectively. the n-accumulation on leaves and bulbs also followed the quadratic behaviour, although only the bulb showed a maximum value of n-accumulation under the level of 182 kg/ha. for total yield, a quadratic effect was observed, increasing up to 234 kg/ha of n. the commercial yield was negatively affected by the high n levels, showing a quadratic effect. the maximum estimated commercial yield (18.74 t/ha) was obtained under 194.4 kg/ha of n. garlic plants originated from tissue culture had better response to higher n levels than those whose bulbs were multiplied in the field. highly significant correlations were observed between n-accumulation and the plant production components.
Reabilita o vocal de laringectomizados com prótese traqueoesofágica
Costa Claudiney C.,Rapoport Abr?o,Chagas José Francisco S.,Oliveira Iara B.
Revista Brasileira de Otorrinolaringologia , 2001,
Abstract: Material: No período de 23 de fevereiro de 1999 a junho de 2000 foram estudados 23 pacientes submetidos à laringectomia total que receberam a prótese traqueoesofágica do tipo Blom-Singer Indeweling Low Presure, sendo 22 pacientes do sexo masculino, com faixa etária variando de 40 a 80 anos. O tempo de acompanhamento variou de 150 a 462 dias. Um paciente era do estádio clínico I, com comprometimento da comissura posterior; um, do estádio II, com les o na subglote; 13, do estádio III; e sete do IV. Forma de estudo: Prospectivo clínico n o randomizado. Método: A prótese foi locada concomitante à laringectomia em sete pacientes; secundariamente, com anestesia geral, em cinco; e, por endoscopia digestiva alta, sob seda o e anestesia local, em quatorze. Foram estudadas as complica es decorrentes da coloca o e uso da prótese vocal, avalia o da qualidade da voz e da inteligibilidade de fala, utilizando parametro perceptivo-auditivo, antes e depois da fonoterapia e do tempo necessário para reabilita o vocal. Resultados: Houve três complica es pós-operatórias relacionadas com procedimento cirúrgico terapêutico, que impossibilitaram a reabilita o vocal; dos vinte possíveis de serem reabilitados com a prótese, dezoito se reabilitaram com índice de 90% de sucesso. O tempo médio para reabilita o variou de um a 65 dias. Conclus o: Concluímos que as complica es decorrentes da coloca o e uso da prótese n o inviabilizaram o sucesso do método; o tempo médio para aquisi o da voz foi de sete dias; a qualidade vocal e a inteligibilidade de fala apresentaram melhora após a realiza o da fonoterapia, sem diferen a estatística significativa; e a coloca o secundária da prótese vocal, utilizando nova técnica, por endoscopia digestiva alta, mostrou-se mais eficaz em rela o às técnicas convencionais.
Educa o física e inclus o: a experiência na Escola Azul
José Francisco Chicon,Katiuscia Aparecida Moreira de Oliveira Mendes,Maria das Gra?as Carvalho Silva de Sá
Movimento , 2011,
Abstract: Estudio de caso con enfoques etnográficos, con el objetivo de investigar y analizar el proceso de inclusión de dos alumnos con necesidades educativas especiales (NEEs) en el espacio-tiempo de las clases de Educación Física. Los instrumentos utilizados fueron el diario de campo y la observación participante. Los datos empíricos llámanos la atención para un grave problema en la Educación/Educación Física, la escuela, en el proceso de inclusión, puede estar formando los estudiantes para reprodujeren actitudes de segregación de los estudiantes con NEEs por discapacidades, haciendo natural la no participación de estos en las actividades escolares y sociales, manteniendo, en el interior del proceso de inclusión, la exclusión.
The Biology and Thermal Requirements of the Fennel Aphid Hyadaphis foeniculi (Passerini) (Hemiptera: Aphididae)
José B. Malaquias, Francisco S. Ramalho, Aline C. S. Lira, Flávia Q. Oliveira, Francisco S. Fernandes, Wesley A. C. Godoy, José C. Zanuncio
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0100983
Abstract: The relationship between the insect development rate and temperature was established very early and represents an important ecological variable for modeling the population dynamics of insects. The accurate determination of thermal constant values and the lower and upper developmental thresholds of Hyadaphis foeniculi (Passerini) (Hemiptera: Aphididae) on fennel (Foeniculum vulgare Miller (Apiales: Apiaceae)) crops would obviously benefit the effective application of control measures. This paper is a study of the biology and thermal requirements of H. foeniculi. Winged insects were collected from fennel crops at the Embrapa Algod?o in Campina Grande, Paraíba. Nymphs (age ≤24 h) produced by winged insects were subjected to constant temperatures of 15, 20, 25, 28, 30 or 33°C, a photophase of 12 h and a relative humidity of 70±10%. The results of the study showed that at temperatures between 15 and 30°C, H. foeniculi nymphs were able to develop normally. The four instars were found at all temperatures tested. However, temperatures of 3 and 33°C were lethal to the nymphs. The nymph stage development time varied from 5 (30°C) to 19 (15°C) days. The influence of temperature on the development time is dependent on the instar. The base temperature (Tb) and the thermal constant (K) for the nymph stage were estimated at 11.2°C and 107.5 degree-days, respectively. The shortest nymph development stage was observed at 30°C, and the highest nymph viability (85.0%) was observed at 28°C. This information can be used for developing phenological models based on the temperature and development rate relationships so that outbreaks of H. foeniculi in the fennel crop can be predicted, therefore improving the application of control programs targeting this fennel pest.
Teores foliares, acúmulo e parti??o de macronutrientes na cultura da abóbora irrigada com água salina
Carmo, Gilcimar A. do;Oliveira, Francisco R. A. de;Medeiros, José F. de;Oliveira, Francisco de A. de;Campos, Marcos de S.;Freitas, Djanira C. de;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2011, DOI: 10.1590/S1415-43662011000500012
Abstract: in the region of mossoró, the area planted with pumpkin has increased substantially because of external demand. this study aimed to assess the effect of irrigation with saline water on the concentration n, p, k, ca and mg in vegetal tissue of the pumpkin. this experiment was carried out from february to april 2008, under field conditions at the experimental farm of ufersa, mossoró, rn. the experimental design was in completely randomized block with four replications. the treatments consisted of five levels of irrigation water salinity measured along the cycle (s1=0.66, s2=2.11, s3=3.29, s4= 4.11 and s5=4.38 ds m-1). the nitrogen, phosphorus, potassium, calcium and magnesium contents were evaluated in leaf at four stages (18, 28, 42 and 56 days after germination (dag) during the crop cycle. the salinity of irrigation water affected the absorption of nutrients by the pumpkin. the highest levels of phosphorus, potassium and magnesium in the leaves of the pumpkin were obtained at the intermediate stage of the crop cycle. the content of nitrogen decreased, while the calcium increased over the crop cycle. nutrient uptake by the pumpkin crop occurred in the following order: k> n> ca> p> mg, scoring a total of 126.5, 72.7, 42.0, 15.5 and 9.7 kg ha-1, the fruits exported about 64.1, 82.8, 73.7, 11.2 and 50.7%, respectively.
Locus de controle em uma popula??o do nordeste brasileiro
Vera Noriega, José ángel;Albuquerque, Francisco José Batista de;Laborín Alvarez, Jesús Francisco;Oliveira, Liana Mirela Souza;Coronado, Guadalupe;
Psicologia: Teoria e Pesquisa , 2003, DOI: 10.1590/S0102-37722003000300003
Abstract: the principal goal of this study was to examine within and between group differences in relation to locus of control in the northeast of brazil (paraiba), and compare these results with those found in mexico (sonara desert). for this purpose an analysis of the psychometric properties of an instrument designed to evaluate the locus of control was carried out. the study is based on a sample of 600 subjects, distributed according to age and gender quotas, forming three age groups (each group containing 100 women and 100 men): 14-22; 23-35 and 36-70 years of age. descriptive statistics for each item, student t test to analyse the descriptive power of each item, factor analysis, and internal consistency indexes were calculated. reyes scale (1995) was used; this instrument was validated for the mexican population, and consists of 78 items with seven optional answers using a likert pictorial scale. factor analysis indicated the existence of four factors that accounted for 36.2% of the total variance. afer the deletion of seven items the scale of the remaining 71 items showed a coefficient alpha of .93. from these results one derives the accuracy of the scale, whose utility is guaranteed in situations to which it has been validated.
Page 1 /418262
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.