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Search Results: 1 - 10 of 40553 matches for " Graziottin Luiz Felipe Rodrigues "
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Measurement of the optical density of packable composites: comparison between direct and indirect digital systems
Graziottin, Luiz Felipe Rodrigues;Costa, Nilza Pereira da;Silveira, Ivori Dutra da;Veeck, Elaine Bauer;
Pesquisa Odontológica Brasileira , 2002, DOI: 10.1590/S1517-74912002000400004
Abstract: the aim of this study was to measure the optical density of four packable composite resins with widths of 1, 2, 3 and 4 mm, by means of digora? (direct) and dentscan dentview? (indirect) digital imaging systems, in order to compare both methods. twenty acrylic plates, with the proposed thicknesses, were used, each one containing a sample of each resin. each acrylic plate was radiographed three times, under a standardized technique. for the digora? system, an optical plate was used under each resin sample, and, for the dentscan dentview? system, occlusal films were employed, totalizing 60 exposures for each system. optical plates and films were scanned and three consecutive optical readouts were carried out, totalizing 1,440 readouts. the results were submitted to statistical analysis and revealed that the average optical density of the four resins always increased as thickness increased. regarding the comparisons between the composite resins, in both analysis the resin with the greater optical density was surefil? followed by prodigy? condensable, alert? and solitaire?. the correlations between the results of digora? and dentscan dentview? were significant for the different thicknesses and materials. the observed tendency is that as the values obtained with the digora? system increase, so do the values obtained with dentscan dentview?. while thickness increased, the values of optical density in both digora? and dentscan dentview? tended to approach each other. the digora? system presented smaller amplitude between the results obtained in adjacent thicknesses.
Measurement of the optical density of packable composites: comparison between direct and indirect digital systems
Graziottin Luiz Felipe Rodrigues,Costa Nilza Pereira da,Silveira Ivori Dutra da,Veeck Elaine Bauer
Pesquisa Odontológica Brasileira , 2002,
Abstract: The aim of this study was to measure the optical density of four packable composite resins with widths of 1, 2, 3 and 4 mm, by means of Digora (direct) and DentScan DentView (indirect) digital imaging systems, in order to compare both methods. Twenty acrylic plates, with the proposed thicknesses, were used, each one containing a sample of each resin. Each acrylic plate was radiographed three times, under a standardized technique. For the Digora system, an optical plate was used under each resin sample, and, for the DentScan DentView system, occlusal films were employed, totalizing 60 exposures for each system. Optical plates and films were scanned and three consecutive optical readouts were carried out, totalizing 1,440 readouts. The results were submitted to statistical analysis and revealed that the average optical density of the four resins always increased as thickness increased. Regarding the comparisons between the composite resins, in both analysis the resin with the greater optical density was SurefilTM followed by ProdigyTM Condensable, AlertTM and Solitaire . The correlations between the results of Digora and DentScan DentView were significant for the different thicknesses and materials. The observed tendency is that as the values obtained with the Digora system increase, so do the values obtained with DentScan DentView . While thickness increased, the values of optical density in both Digora and DentScan DentView tended to approach each other. The Digora system presented smaller amplitude between the results obtained in adjacent thicknesses.
Severe hyperprolactinemia associated with internal carotid artery aneurysm: differential diagnosis between prolactinoma and hypothalamic-pituitary disconnection
Duarte, Felipe Henning Gaia;Machado, Marcio Carlos;Lima, Joilma Rodrigues de;Salgado, Luiz Roberto;
Arquivos Brasileiros de Endocrinologia & Metabologia , 2008, DOI: 10.1590/S0004-27302008000700017
Abstract: sellar and parasellar masses blocking inhibitory hypothalamic dopaminergic tonus can produce hyperprolactinemia. one of these conditions, seldom reported, is internal carotid artery aneurysm causing pituitary stalk compression and hyperprolactinemia, the majority of which is related to small increases in serum prolactin levels. the aim of this study is to report the case of a patient with an internal carotid aneurysm and severe hiperprolactinemia. a 72 years old female patient, on oncology follow-up for clinically controlled cervical carcinoma, was evaluated due to worsening chronic headaches. during the investigation, computed tomography and magnetic resonance imaging (mri) showed a sellar mass associated with high prolactin level (1.403 μg/l) that initially was considered a macroprolactinoma, and treated with bromocriptine. however, subsequent pituitary mri suggested an internal carotid aneurysm, which was confirmed by an angioresonance imaging of cerebral vessels. on low bromocriptine dose (1.25 mg/day), there was a prompt normalization of prolactin levels with a great increase (> 600 μg/l) after withdrawal, which was confirmed several times, suggesting hpd. we report a patient with internal carotid artery aneurysm with severe hyperprolactinemia never reported before in patients with hpd, and the need for a differential diagnosis with macroprolactinomas even considering high prolactin levels.
Effects of the unilateral removal and dissection of the masseter muscle on the facial growth of young rats
Rodrigues, Lucimar;Traina, Andréia Aparecida;Nakamai, Luiz Felipe;Luz, Jo?o Gualberto de Cerqueira;
Brazilian Oral Research , 2009, DOI: 10.1590/S1806-83242009000100015
Abstract: this study analyzed the effects of the unilateral removal and dissection of the masseter muscle on the facial growth of young rats. a total of 30 one-month-old wistar rats were used. unilateral complete removal of the masseter muscle was performed in the removal group, and detachment followed by repositioning of the masseter muscle was performed in the dissection group, while only surgical access was performed in the sham-operated group. the animals were sacrificed at three months of age. axial radiographic projections of the skulls and lateral projections of the hemimandibles were taken. cephalometric evaluations were made and the values obtained were submitted to statistical analyses. in the removal group, there were contour alterations of the angular process, and a significant homolateral difference in the length of the maxilla and a significant bilateral difference in the height of the mandibular body and the length of the mandible were observed. comparison among groups revealed significance only in the removal group. it was concluded that the experimental removal of the masseter muscle during the growing period in rats induced atrophic changes in the angular process, as well as asymmetry of the maxilla and shortening of the whole mandible.
Efeitos da enramicina e monensina sódica sobre a digest?o de nutrientes em bovinos alimentados com dietas contendo alto nível de concentrados
Borges, Luiz Felipe de Onofre;Passini, Roberta;Meyer, Paula Marques;Rodrigues, Paulo Henrique Mazza;
Revista Brasileira de Zootecnia , 2008, DOI: 10.1590/S1516-35982008000400013
Abstract: the objective of this trial was to study the effects of enramycin and sodium monensin administration on total digestibility of diet nutrients and digestible dry matter intake in bovine. twelve non-pregnant and non-lactating cows (675 kg ± 63 bw) were randomly assigned to three treatments: control group, enramycin-treated group or monensin-treated group. animals received a diet containing 60% of concentrates (corn, soy bean meal and minerals) and 40% of forage (sugarcane). treatments were 20 mg/animal/day of enramycin or 300 mg/animal/day of monensin. trial lasted 21 days, the last 10 used for external marker administration (15 g of chromic oxide/animal/day) and the last 5 for feces collection and feed sampling. none of the antibiotics affected digestible dry matter and tdn intake and the digestibilities of dry matter, crude protein, ether extract, acid detergent fiber, neutral detergent fiber, starch, gross energy or total digestible nutrients.
Survival rates of mouse blastocyst vitrified in dimethylformamide based solutions associated with ethylene glicol or 1-2 propanediol
Villamil, Paula Rodriguez;Ongaratto, Felipe Ledur;Silva, Daniela Scherer da;Rodrigues, Berenice de Avila;Rodrigues, Jose Luiz;
Ciência Rural , 2011, DOI: 10.1590/S0103-84782011005000139
Abstract: the aim of this study was to determine the effect of dimethylformamide (df) associated with ethylene glycol (eg) or 1-2 propanediol (proh) during vitrification, on the in vitro development of mouse blastocysts. cryoprotectant toxicity was evaluated exposing embryos into three different equilibrium solutions (es) composed by df, eg or proh mixtures (10% v/v of each) in mpbs + 0.5% pva at different interval times (1, 3 and 10min). in a second experiment, embryos were exposed to the same es (either 1 or 3min), following for the three respectively vitrification solutions (vs) (20% v/v of each) for 30s. after 72 hours of in vitro culture, embryo hatching and expansion rates were similar for the es1 and es2 equilibration solutions during the time interval of 1 or 3min. however embryos exposed for 10 min to the df equilibration solutions, had lower survival rates than eg-proh solution (p<0.01). furthermore, survival rates for embryos exposed to df-proh (es+vs) were lower than embryos exposed to the other solutions (p<0.01). blastocyst vitrification was performed with the three es+vs (for 1min and 30s, respectively), using glass micropipettes (gmp). survival rates were lower for blastocysts vitrified with df solutions (3%-3/108 and 17.1%-19/111) (p<0.01) than with proh+eg vitrification solutions (69%-73/105). in conclusion, df as a cryoprotectant into vitrification solutions have deleterious effects on the in vitro developmental competence of vitrified mouse blastocysts.
Análise da fun??o diastólica do ventrículo esquerdo em hipertensos sob varia??o de condi??es hemodinamicas provocadas: estudo comparativo entre o doppler transmitral e tissular
Danzmann, Luiz Cláudio;Freitas, Valéria Centeno de;Araújo, Luiz Felipe;Torres, Marco Antonio Rodrigues;
Arquivos Brasileiros de Cardiologia , 2006, DOI: 10.1590/S0066-782X2006001500009
Abstract: objective: to evaluate the behavior of lv diastolic displacement velocities of basal posterior septum near mitral ring segment obtained by tissue doppler in relation to mitral flow velocities of hypertensive subjects, submitted to preload increase by left inferior limbs elevation for 5 minutes, and during 1 minute of handgrip (conditions 1 and 2, respectively). methods: twenty five outpatients (15 men, 52±11 years), with arterial hypertension > 3 years, by the transmitral flow doppler variables: e, a and e/a, and of tissue doppler: e?, a? and e?/a?, in basal situation and in conditions 1 and 2. for comparison of results in basal situation with conditions 1 and 2 a paired t test was applied. results: e(cm/s) varied from 68,88 ± 11,94 to 75,82 ± 15,71* and e?(cm/s) varied from 8,22 ± 2,30 to 8,31 ± 2,24 in condition 1 (p<0.05). in addition, a comparison of variation percent (%) of doppler transmitral indices with corresponding tissue doppler indices variation % showed a significant difference between e and e?, with preload increase (p=0.01). conclusion: patients with left ventricular adaptation to systemic arterial hypertension showed less modification of the index e' than e, after preload increase maneuver, an evidence that may suggest its more ample utilization in the context of echocardiographic left ventricular diastolic function evaluation
Methionine- and choline-deficient diet induces hepatic changes characteristic of non-alcoholic steatohepatitis
Marcolin, éder;Forgiarini, Luiz Felipe;Tieppo, Juliana;Dias, Alexandre Sim?es;Freitas, Luiz Antonio Rodrigues de;Marroni, Norma Possa;
Arquivos de Gastroenterologia , 2011, DOI: 10.1590/S0004-28032011000100015
Abstract: context: non-alcoholic steatohepatitis is a disease with a high incidence, difficult diagnosis, and as yet no effective treatment. so, the use of experimental models for non-alcoholic steatohepatitis induction and the study of its routes of development have been studied. objectives: this study was designed to develop an experimental model of non-alcoholic steatohepatitis based on a methionine- and choline-deficient diet that is manufactured in brazil so as to evaluate the liver alterations resulting from the disorder. methods: thirty male c57bl6 mice divided in two groups (n = 15) were used: the experimental group fed a methionine- and choline-deficient diet manufactured by brazilian company pragsolu??es?, and the control group fed a normal diet, for a period of 2 weeks. the animals were then killed by exsanguination to sample blood for systemic biochemical analyses, and subsequently submitted to laparotomy with total hepatectomy and preparation of the material for histological analysis. the statistical analysis was done using the student's t-test for independent samples, with significance level of 5%. results: the mice that received the methionine- and choline-deficient diet showed weight loss and significant increase in hepatic damage enzymes, as well as decreased systemic levels of glycemia, triglycerides, total cholesterol, hdl and vldl. the diagnosis of non-alcoholic steatohepatitis was performed in 100% of the mice that were fed the methionine- and choline-deficient diet. all non-alcoholic steatohepatitis animals showed some degree of macrovesicular steatosis, ballooning, and inflammatory process. none of the animals which were fed the control diet presented histological alterations. all non-alcoholic steatohepatitis animals showed significantly increased lipoperoxidation and antioxidant enzyme gsh activity. conclusion: the low cost and easily accessible methionine- and choline-deficient diet explored in this study is highly effective in inducing steatosis and
Relationship between maturity levels and neuromuscular capacity among youth soccer players and individuals not practicing soccer  [PDF]
Dihogo Gama de Matos, Estélio Henrique Martin Dantas, Felipe José Aidar, Aldo Coelho Silva, Bernardo Minelli Rodrigues, Ingi Klain, Robert C. Hickner, André Luiz Carneiro, Mauro Lucio Mazini Filho
Health (Health) , 2013, DOI: 10.4236/health.2013.51005
Abstract:

The aim of this study was to compare maturational stage and neuromuscular skills among soccer players and non-athletes, as well as to investigate the relationship between maturation and neuromuscular performance. Twenty five adolescent males (14.3 ± 0.45 years) participated in the study and were divided into two groups: soccer players (SP – n = 13, 14.1 ± 0.3 years, 58.9 ± 6.90 kg, 1.72 ± 0.04 m, 19.9 ± 1.7 kg·m2, 13.3% ± 4.3% fat) and non-athletes (NA – n = 12, 14.5 ± 0.5 years, 57.3 ± 6.9 kg, 1,67 ± 0.06 m, 20.6 ± 3.9 kg·m2, 14.0% ± 5.7% fat). The square test and 20 m speed test were used to assess agility and speed, respectively. The Tanner self-assessment of pubic hair and genitalia development test was used to estimate maturational development. The Shapiro Wilk test was used to verify the normality of samples. For any data not normally distributed, the non-parametric Mann Whitney test, as well as Kendall’s Tau correlation test, were used. The p-values determined for agility (p = 0.017) and speed (p = 0.054) indicated that agility was the only variable significantly different between SP and NA. The SP and NA groups showed no difference in the levels of maturation (p = 0.41), and maturational status was not significantly correlated with agility (r = 0.013) or speed (r = ?0.003). Conclusion: Individuals who practiced football had better results for the agility test than non-athletes, even with no difference between the degree of maturation and speed. There is a low correlation between level of maturity and agility or speed.

Numerical Study of the Injection of Carbon Dioxide in a Homogeneous Porous Media  [PDF]
Luiz Umberto Rodrigues Sica
Open Journal of Fluid Dynamics (OJFD) , 2018, DOI: 10.4236/ojfd.2018.81009
Abstract:
This work proposes a locally conservative and less restrictive algorithm to solve the problem dealt with in [1], i.e. a two-phase flow in a homogeneous porous medium (water and CO2), with mass absorption between the fluid phases and reaction between the CO2 phase and the rock. The latter is modeled by two non-linear hyperbolic equations that represent the transport of the flowing phases for a given velocity field (equations of saturation and concentration). From the numerical point of view, we use the operator splitting technique to properly treat the time scale of each physical phenomenon and a high-order non-oscillatory central-scheme finite volume method for nonlinear hyperbolic equations proposed by [2] that was extended for a system of equations with source terms to treat the equations that govern the saturation and concentration of phases. In addition, with respect to source terms, the mass flux between fluid phases was handled using the flash methodology, whereas kinetic theory was applied for reproducing the changes in porosity and permeability that are caused by the reaction of CO2 with the rock. The same physical trends observed in [1] were obtained in our numerical results which indicate a good predictive capability. Furthermore, this method avoids the difficulties that arise when adopting small time steps enforced by CFL stability restrictions. Finally, the results obtained show that the applicability of the KT method is beyond just a single nonlinear conservation law with the absence of source terms.
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