Metamorphic evolution of a subduction complex, South Shetland Islands, Antarctica

A subduction complex composed of ocean floor material mixed with arc-derived metasediments crops out in the Elephant Island group and at Smith Island, South Shetland Islands, Antarctica, with metamorphic ages of 120-80 Ma and 58-47 Ma? respectively. Seven metamorphic zones (I-VII) mapped on Elephant Island delineate a gradual increase in metamorphic grade from the pumpellyite-actinolite facies, through the crossite-epidote blueschist facies, to the lower amphibolite facies. Geothermometry in garnet-amphibole and garnet-biotite pairs yields temperatures of about 350 degrees C in zone III to about 525 degrees C in zone VII. Pressures were estimated on the basis of Si content in white mica, Al2O3 content in alkali amphibole, Na-M4/Al-IV in sodic-calcic and calcic amphibole, Al-VI/Si in calcic amphibole, and jadeite content in clinopyroxene. Mean values vary from about 6-7.5 kbar in zone II to about 5 kbar in zone VII. Results from the other islands of the Elephant Island group are comparable to those from the main island; Smith Island yielded slightly higher pressures, up to 8 kbar, with temperatures estimated between 300 and 350 degrees C. Zoned minerals and other textural indications locally enable inference of P-T-t trajectories, all with a clockwise evolution. A reconstruction in space and time of these P-T-t paths allows an estimate of the thermal structure in the upper crust during the two ductile deformation phases (D-1 & D-2) that affected the area. This thermal structure is in good agreement with the one expected for a subduction zone. The arrival and collision of thickened oceanic crust may have caused the accretion and preservation of the subduction complex. In this model, D-1 represents the subduction movements expressed by the first vector of the clockwise P-T-t path, D-2 reflects the collision corresponding to the second vector with increasing temperature and decreasing pressure, and D-3 corresponds to isostatic uplift accompanied by erosion, under circumstances of decreasing temperature and pressure.

Repair bond strength of a resin composite to alumina-reinforced feldspathic ceramic

This study compared the microtensile bond strength of a repair resin to an alumina-reinforced feldspathic ceramic (Vitadur-alpha, Vita) after 3 surface conditioning methods: Group 1, etching with 9.6% hydrofluoric acid for 1 minute plus rinsing and drying, followed by application of silane for 5 minutes; group 2, airborne particle abrasion with 110-mm aluminum oxide using a chairside air-abrasion device followed by silane application for 5 minutes; group 3, chairside tribochemical silica coating with 30-mu m SiOx followed by silane application for 5 minutes (N = 30). Group 1 presented the highest mean bond strength (19.7 +/- 3.8 MPa), which was significantly higher than those of groups 2 (10 +/- 2.6 MPa) and 3 (10.4 +/- 4 MPa) (P <.01). Scanning electron microscope analysis of the failure modes demonstrated predominantly mixed types of failures, with adhesive and/or cohesive failures in all experimental groups.

Frequency of coronary artery disease in patients with renal artery stenosis without clinical manifestations of coronary insufficiency

Atherosclerotic renal artery stenosis (RAS) and coronary artery disease (CAD) arise from the same multiple risk factors. The purpose of this study was to assess the frequency of previously undiagnosed CAD in patients with angiographically confirmed RAS, by conducting coronary arteriography in the same setting. of 57 consecutive patients referred for renal arteriography on clinical grounds during a 14-month period, 28 had no RAS and 6 had RAS, but previously documented CAD. of the remainder 23 patients. 17 (74%; CI 56%-92%) had both RAS and CAD (7 single vessel, 4 two-vessel, and 7 multivessel disease). The clinical characteristics, such as age, blood pressure (BP) levels, signs of heart failure, were no different between those with and without CAD, although the 4 diabetic patients, the 4 patients with fundoscopic findings of grade III retinopathy, 11 of 14 with peripheral arterial disease, and 7 of 8 patients with prior stroke belonged in the CAD group. None developed complications as a result of the two consecutive procedures. The data suggest that in patients with RAS the frequency of silent CAD is high and cannot be predicted on clinical grounds alone, therefore coronary angiography should be routinely recommended in the same setting.

Acid Black 48 dye biosorption using Saccharomyces cerevisiae immobilized with treated sugarcane bagasse

The textile industry consumes large quantities of water and chemicals, especially in dyeing and finishing processes. Textile dye adsorption can be accomplished with natural or synthetic compounds. Cell immobilization using biomaterials allows the reduction of toxicity and mechanical resistance and opens spaces within the matrix for cell growth. The use of natural materials, such as sugarcane bagasse, is promising due to the low costs involved. The aim of the present study was to evaluate the use of sugarcane bagasse treated with either polyethyleneimine (PEI), NaOH or distilled water in the cell immobilization of Saccharomyces cerevisiae for textile dye removal. Three different adsorption tests were conducted: treated sugarcane bagasse alone, free yeast cells and bagasse-immobilized yeast cells. Yeast immobilization was 31.34% with PEI-treated bagasse, 8.56% with distilled water and 22.54% with NaOH. PEI-treated bagasse exhibited the best removal rates of the dye at all pH values studied (2.50, 4.50 and 6.50). The best Acid Black 48 adsorption rates were obtained with use of free yeast cells. At pH 2.50, 1 mg of free yeast cells was able to remove 5488.49 g of the dye. The lowest adsorption capacity rates were obtained using treated bagasse alone. However, the use of bagasse-immobilized cells increased adsorption efficiency from 20 to 40%. The use of immobilized cells in textile dye removal is very attractive due to adsorbed dye precipitation, which eliminates the industrial need for centrifugation processes. Dye adsorption using only yeast cells or sugarcane bagasse requires separation methods.

Size effects in the magnetization of a superconducting wire

The size effects in the magnetization of a long cylindrical wire of circular cross section in the presence of an external magnetic field are investigated. For this study the London theory is used with boundary conditions appropriate for this geometry. Using the Monte Carlo simulated annealing method, the free energy of the mixed state is minimized with respect to the vortex positions. The ground state of the vortex lattice for n = 1 up to 18 vortices for a given radius of the cylinder is obtained. It is found that the finite size of the sample provokes a matching effect in the magnetization, as found in experiments with superconducting samples of finite size but different geometry. © 1999 American Institute of Physics.

Fatores de risco de desordens osteomusculares presentes no posto de trabalho de estudantes de odontologia

Objective: To identify the perception of undergraduate dental students with respect of the risk factors present at the study/work place that could contribute to the development of musculoskeletal disorders. Method: A total of 348 undergraduate dental students from Araraquara Dental School - UNESP were evaluated. The Portuguese version of the Work-related activities that may contribute to job-related pain and/or injury questionnaire was used. Data were analyzed by descriptive statistics. Results: The mean perception of the undergraduates was 5.68 (SD=1.92). The factors with highest mean values were continue working with some kind of pain or lesion (7.49, SD=2.55), bending or twisting the back in an uncomfortable manner (7.39, SD=2.59), working in uncomfortable/inadequate positions (7.27. SD=2.60) and working in the same position for long periods (7.02. SD=2.53). Overall, female students presented higher mean scores of perception than male students. The body parts with highest prevalence of pain were the neck (67.0%) and lower back (65.8%). Conclusion: The students showed perception in relation to the risk factors for musculoskeletal disorders present at the study/work place.

Alterações eletromiográficas e histopatológicas da musculatura de cães naturalmente infectados por Leishmania infantum

The aim of this study was to evaluate the electromyographic and histopathological changes in skeletal muscles of dogs naturally infected by L. infantum. Twenty five mixed breed adult dogs with parasitological, molecular and serological diagnosis were selected. The evaluated muscles were: triceps brachial, extensor carpi radialis, biceps femoris and gastrocnemius. One dog had locomotor clinical signs with hind limbs paresis associated with severe muscle atrophy. Twenty-three (92%) had some type of muscular change, and in 22 (88%) such changes were directly identified by electromyography. Even without any clinical signs of the disease, 10 (40%) dogs had electromyographic and histopathological changes. Leishmania antigens were detected in muscles of four (16%) dogs. The electromyographic evaluation indicated the occurrence of chronic polymyositis in 13 (52%) dogs, the presence of both acute and chronic muscle inflammation four (16%), acute myopathy in two (8%) and absence of electromyographic abnormalities in three (12%) dogs. The most frequently observed histopathological changes were degeneration and necrosis of myofibers and inflammatory infiltration observed in 12 (48%) dogs. Other changes were decreased diameter of muscle fibers in 15 (60%) and peri or endomysial fibrosis in 14 (56%) animals. The changes observed in the present study showed that even in the absence of clinical signs, most dogs infected by Leishmania infantum have chronic polymyositis.

Comparison of the caries-preventive effect of a glass ionomer sealant and fluoride varnish on newly erupted first permanent molars of children with and without dental caries experience

Purpose: This longitudinal clinic study evaluated the effect of a glass ionomer sealant (GIS) and a fluoride varnish (FV) in the prevention of dental decay on newly erupted permanent molars of children with and without caries experience. Materials and methods: Eighty children, aged 6-8 years, with all four newly erupted first permanent molars, were divided into two groups. Group 1 consisted of 53 children without caries experience and group 2 consisted of 27 children with dental caries experience. Permanent molars of the right side were sealed with GIS and the fluoride varnish was applied on the other two permanent first molars. Evaluation of GIS retention and the effectiveness of both materials in the prevention of dental caries were performed after 6, 12 and 18 months. Results: After 18 months, of the 299 teeth, 271 (91%) showed no caries lesions and 28 presented caries lesions (9%). Teeth sealed with GIS had more carious lesions (15) than teeth with fluoride varnish (13). Most of the teeth (70%) that presented carious lesions were in group 2. Of the 138 sealed teeth, only one showed GIS to be totally present, 95 were partially present and 42 teeth were absent. Conclusion: The caries-preventive effect was very similar between both treatments. The presence of dental caries prevailed in the children with caries experience. © 2013 Informa Healthcare.

Measurement of the Bs0→μ+μ- branching fraction and search for B0→μ+μ- with the CMS experiment

Results are presented from a search for the rare decays Bs0→μ+μ- and B0→μ+μ - in pp collisions at √s=7 and 8 TeV, with data samples corresponding to integrated luminosities of 5 and 20 fb-1, respectively, collected by the CMS experiment at the LHC. An unbinned maximum-likelihood fit to the dimuon invariant mass distribution gives a branching fraction B(Bs0→μ+μ-)=(3.0-0.9+1.0) ×10-9, where the uncertainty includes both statistical and systematic contributions. An excess of Bs0→μ+μ- events with respect to background is observed with a significance of 4.3 standard deviations. For the decay B0→μ+μ- an upper limit of B(B0→μ+μ-)<1.1×10 -9 at the 95% confidence level is determined. Both results are in agreement with the expectations from the standard model. © 2013 CERN. Published by the American Physical Society under the terms of the.

Estudo dos mecanismos governantes do efeito de escala na microusinagem

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Desempenho e comportamento de coelhos em crescimento em gaiolas enriquecidas

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Estruturas vesiculares em misturas de surfactantes catiônicos

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Desenvolvimento pós-natal do EEG em cães normais: avaliação visual qualitativa e quantitativa até 45 dias de vida

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Avaliação das mudanças tegumentares naturais e induzidas pelo aparelho de Herbst, em indivíduos com má oclusão classe II, divisão 1, na fase da dentadura mista

Pós-graduação em Ciências Odontológicas - FOAR

Prevalência da co-infecção por Leishmania sp. em pacientes portadores de HIV/AIDS atendidos pelo programa municipal de DST/AIDS no Centro de Testagem e Aconselhamento (CTA) de Imperatriz-Maranhão

A co-infecção Leishmania-HIV-Aids é um sério problema de saúde pública em quase todo o mundo. No entanto, os casos de co-infecção ainda são subestimados, uma vez que, a leishmaniose não se constitui doença definidora de Aids. Foi realizado um estudo descritivo transversal de Dezembro de 2011 a Fevereiro de 2012, com o objetivo de investigar a prevalência da co-infecção HIV/Leishmania em pacientes atendidos pelo programa municipal de DST/aids no Centro de Testagem e Aconselhamento (CTA) de Imperatriz-MA. A população de estudo foi constituída por 199 indivíduos. A coleta de dados foi feita por meio de um questionário para a obtenção de dados demográficos, socioeconômicos e epidemiológicos, bem como foi realizado exame de coleta de material biológico (sangue) de todos os pacientes para detecção da infecção por Leishmania sp., por meio de exames laboratoriais (contagem de CD4 e CD8) e pesquisa da PCR. Entre os pacientes observou-se similaridade entre a frequência dos gêneros, 49,2% masculino e 50,8% feminino, com média de idade de 40 anos. Foi observado que 61,8% possuem baixo nível de instrução e 69,3% possuem renda mensal de até um salário mínimo. 2,01% (4/199) dos pacientes analisados apresentaram co-infecção Leishmania/HIV. Sendo, destes, 3 que apresentaram infecção mista por Leishmania (V.) sp e Leishmania (L.) amazonensis, causadores de LTA e um paciente infectado por Leishmania (L.) chagasi, causador de LV. Na comparação dos fatores de risco, comorbidades e complicações entre os pacientes analisados observou-se que a malária foi o único fator que se mostrou significante em torno de 10,05%. Esse foi o primeiro estudo que investiga a coinfecção HIV Leishmaniana cidade de Imperatriz, Maranhão e a identificação de pacientes coinfectados foi de fundamental importância para o serviço que a partir de então poderá realizar o acompanhamento destes pacientes. Este estudo permitiu conhecer a magnitude da prevalência da co-infecção Leishmania/HIV. Assim, sugerimos que o teste anti-Leishmaniaseja realizado em todos os indivíduos com HIV/Aids, e que sejam incrementadas políticas públicas voltadas para essa problemática.