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Search Results: 1 - 10 of 84451 matches for " Sara Maria Andrade; "
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Effect of professional cleaning and dental brushing with or without fluoridated dentifrice on enamel remineralization
Marta, Sara Nader;Lima, José Eduardo de Oliveira;Vono, Bernardo Gonzales;Silva, Salete Moura Bonifácio da;Machado, Maria Aparecida Andrade Moreira;Pin, Maria Ligia Gerdullo;
Journal of Applied Oral Science , 2005, DOI: 10.1590/S1678-77572005000300004
Abstract: an in situ evaluation of the potential rehardening effect of fluoridated and non-fluoridated toothpastes with or without air polishing was conducted. ten volunteers, using acrylic palatal appliances containing two bovine enamel blocks with artificial carious lesions, took part in this study. four times a day, after the main meals and at night, the volunteers, in a habitual way, brushed their natural teeth with the dentifrice indicated to the experimental design and after that the appliances were put again into the mouth. they were divided into 4 different groups: g1 - control - non-fluoridated dentifrice; g2 - fluoridated dentifrice; g3 - non-fluoridated dentifrice, but having a previous prophylaxis using air polishing; g4 - fluoridated dentifrice and previous air polishing. the effects of treatments on enamel rehardening were evaluated in the blocks that were assessed by surface microhardness, and the percentage of surface microhardness change (%reh) was calculated in relation to the baseline values. the results showed that %reh was higher in the groups with fluoridated dentifrice, and professional prophylaxis did not have an additional effect in the groups of fluoridated dentifrices (p<0.05). the data suggested that, in the absence of fluoride, removal of dental plaque helped to increase the process of enamel rehardening.
Selection of Beauveria bassiana (Bals.) Vuill. isolates for controlling Sitophilus zeamais (Mots.) (Coleoptera: Curculionidae)
Rondelli,Vando Miossi; de Carvalho,José Romário; Pratissoli,Dirceu; Polanczyk,Ricardo Antonio; de Alencar,Jo?o Rafael De Conte Carvalho; Zinger,Fernando Domingo; Pereira,Sara Maria Andrade;
Idesia (Arica) , 2012, DOI: 10.4067/S0718-34292012000300013
Abstract: sitophilus zeamais (mots.) (coleoptera: curculionidae) is considered a major pest of maize, responsible for reducing grain quality and making the corn inappropriate for industrial use and human consumption. s. zeamais has been controlled exclusively with chemical products. the objective of this research was to select isolates of beauveria bassiana (bals.) vuill. to control s. zeamais. beetles were immersed in conidia suspensions of each isolate for five seconds and placed in a gerbox container with maize grains. in pathogenicity tests, the isolates that caused the highest mortality to the maize weevil were esalq-447 (68.0%), cca-ufes/ bb-36 (57.3%) and cca-ufes/bb-31 (51.3%). esalq-447 was the most virulent, with an lc50 of 1.7 x 107 conidia/ml and shows promise for controlling maize weevils. these isolates of b. bassiana can be used as effective substitutes for conventional chemical control, normally carried out with phosphine. further tests should be performed under field and semi-field conditions to develop an appropriate strategy for the use of this entomopathogen to manage s. zeamais.
Atividades antioxidante e fungitóxica do óleo essencial de capim-lim?o e do citral
Guimar?es, Luiz Gustavo de Lima;Cardoso, Maria das Gra?as;Sousa, Paulo Estev?o de;Andrade, Juliana de;Vieira, Sara Silveira;
Revista Ciência Agron?mica , 2011, DOI: 10.1590/S1806-66902011000200028
Abstract: given the importance of essential oils, this study evaluated the antioxidant activity and fungitoxic effects of lemongrass essential oil and its main constituent citral on mycelial inhibition of phytopathogens fusarium oxysporum cubense, colletotrichum gloeosporioides, bipolaris sp. and alternaria alternata. the antioxidant activity was evaluated by employing the dpph free radical reduction method and oxidation tests of the system β-carotene/linoleic acid. for each method, a completely randomized design in a 4 x 5 factorial arrangement was used with four compounds (essential oil, citral, thymol and α-tocopherol) and five concentrations (5; 10; 25; 50 and 100 mg l-1), with three replicates. the tests to determine fungitoxic activities were performed by applying the in vitro fumigation test on mycelial inhibition of studied phytopathogens. the treatments were arranged in a completely randomized design with three replicates and a factorial arrangement. the essential oil and citral showed little antioxidant activity by the methodology that measures the reduction of the stable radical dpph; however, by the methodology that employs the emulsified β-carotene/linoleic acid system, these compounds showed significant antioxidant activities. at fungitoxic activities, the essential oil and citral showed greater activity against the phytopathogen alternaria alternata. when compared to the values of ic50, the lowest values presented by the essential (75.83 μg ml-1) and citral (58.24 μg ml-1) oils were found for bipolaris sp. citral caused the greatest mycelial inhibition on all phytopathogens.
Interferência do intervalo de administra??o da droga sobre a nefrotoxicidade da gentamicina em ratos
Oliveira, Ver?nica Cunha Rodrigues;Tejos, Carla Roberta;Hosaka, Elisabeth Mie;Andrade, Sara Cogo;Araújo, Magali;Vattimo, Maria de Fátima Fernandes;
Revista da Escola de Enfermagem da USP , 2001, DOI: 10.1590/S0080-62342001000200016
Abstract: the acute renal failure (arf), that still presents a righ mortality rate (50%) can be defined as an abrupt decline of the glomerular filtration, resultant of isquemic or toxicity event. the drugs nephrotoxicity is one of the most frequent cause (27%) of arf and it is suggested that the interval of administration of the drug can interfere in this side effect, however the best administration regimen is not very well established. this study evaluated the renal function of rats that received gentamicin (100mg/kg) in one dose or in two doses (2x 50mg/kg),by intraperitoneal infusion. the results obtained in this research, indicated that the single infusion of gentamicin determined smaller nephrotoxicity by the reduction of serum concentration of this drug in 24 hours, decreasing the intracelular accumulation of this gentamicin, which is one of the main cellular mechanisms of this renal injury. the single dose treatment regime, otherwise, showes advantages not only related to the nephrotoxicity effect, but also it is relevant to the cost and safety, which can be rationable factors in the administration of this drug.
An -Estimate for Weak Solutions of Elliptic Equations
Sara Monsurrò,Maria Transirico
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/376179
Abstract: We prove an -a priori bound, >2, for solutions of second order linear elliptic partial differential equations in divergence form with discontinuous coefficients in unbounded domains.
Biological control and bioactive microbial metabolites: a coffee quality perspective
Chalfoun, Sara Maria;
Ciência e Agrotecnologia , 2010, DOI: 10.1590/S1413-70542010000500001
Abstract: the improvement of techniques of biological control and the use of metabolites produced by microorganisms to obtain products that can be applied in various fields, is getting stronger in face of the undeniable advantages in relation to the models currently in adopted. this review, besides general considerations about the principles and the application of measures of biological control and usage of metabolites produced by microorganisms as sustainable alternatives for the agrochemical segment, among others, reports theexperience lived by the author and the institutions to which she is associated, concerning identification, characterization and development of a biological fungicide resulting from the encapsulation of the fungus cladosporium cladosporioides (fres.) de vries, after proving its bioprotecting action on the quality of the coffee. the possibility of using microorganisms as a source of metabolites obtained from biological extracts, with applications in various fields, is also presented and discussed.
Caminha no séc. XVI : dinamicas mercantis
Sara Maria Costa Pinto
Revista da Faculdade de Letras : Historia , 2008,
Abstract: The study of small and medium-sized ports is crucial for the understanding of the seaport′s economical dynamics in the Portuguese Early Modern Age. Our master thesis is centred in a case study, the maritime community of Caminha, in the 16th century. Here we intend to analyze the role that this small port played on the complementary interactions of the Portuguese Northwest seaports system.
Maria Sara Abdala Martins
Nucleus , 2005,
Abstract: A Síndrome do X Frágil é uma condi o de origem genética, considerada a causa mais freqüentede comprometimento intelectual herdado. As pessoas afetadas apresentam atraso no desenvolvimento, problemasde comportamento e, eventualmente, características físicas peculiares. Objetivamos, nesta pesquisa, divulgarpara famílias e profissionais, informa es sobre o que é a Síndrome do X Frágil, quem pode ser afetado, quais ascaracterísticas físicas, intelectuais, comportamentais, emocionais; o diagnóstico e o tratamento.
Fullerene-Based Symmetry in Hibiscus rosa-sinensis Pollen
Kleber Andrade, Sara Guerra, Alexis Debut
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0102123
Abstract: The fullerene molecule belongs to the so-called super materials. The compound is interesting due to its spherical configuration where atoms occupy positions forming a mechanically stable structure. We first demonstrate that pollen of Hibiscus rosa-sinensis has a strong symmetry regarding the distribution of its spines over the spherical grain. These spines form spherical hexagons and pentagons. The distance between atoms in fullerene is explained applying principles of flat, spherical, and spatial geometry, based on Euclid’s “Elements” book, as well as logic algorithms. Measurements of the pollen grain take into account that the true spine lengths, and consequently the real distances between them, are measured to the periphery of each grain. Algorithms are developed to recover the spatial effects lost in 2D photos. There is a clear correspondence between the position of atoms in the fullerene molecule and the position of spines in the pollen grain. In the fullerene the separation gives the idea of equal length bonds which implies perfectly distributed electron clouds while in the pollen grain we suggest that the spines being equally spaced carry an electrical charge originating in forces involved in the pollination process.
Clinical Correlates and Drug Resistance in HIV-Infected and -Uninfected Pulmonary Tuberculosis Patients in South India  [PDF]
Sara Chandy, Elsa Heylen, Baijayanti Mishra, Maria Lennartsdotter Ekstrand
World Journal of AIDS (WJA) , 2016, DOI: 10.4236/wja.2016.63013
Abstract: Objectives: To examine demographics, clinical correlates, sputum AFB (acid fast bacilli) smear grading DOTS (Directly Observed Therapy Short Course) uptake, and drug resistance in a cohort of newly-diagnosed, smear positive pulmonary tuberculosis (TB) patients with respect to HIV status at baseline, and compare smear conversion rates, side effects and mortality after two months. Design: A prospective study among 54 HIV positive and 41 HIV negative pulmonary TB patients. Data were collected via face-to-face interviews, review of medical records, and lab tests. Results: HIVTB co-infected patients, though more symptomatic at baseline, showed more improvement in their symptoms compared to HIV-uninfected TB patients at follow-up. The HIV co-infected group had more prevalent perceived side effects, and sputum smear positivity was marginally higher compared to the HIV negative group at follow-up. Mortality was higher among the HIV-infected group. Both groups had high rates of resistance to first-line anti-tubercular drugs, particularly isoniazid. There was no significant difference in the drug resistance patterns between the groups. Conclusions: Prompt initiation and provision of daily regimens of ATT (Anti-Tubercular treatment) along with ART (Anti-Retroviral treatment) via ART centers is urgently needed in India. As resistance to ART and/or ATT is directly linked to medication non-adherence, the use of counseling, regular reinforcement, early detection and appropriate intervention strategies to tackle this complex issue could help prevent premature mortality and development of resistance in HIV-TB co-infected patients. The high rate of isoniazid resistance might preclude its use in India as prophylaxis for latent TB in HIV infected persons as per the World Health Organization (WHO) guideline.
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