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Search Results: 1 - 10 of 223681 matches for " Sergio P; Rodrigues "
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Importancia do ultra-som tridimensional na avalia??o anorretal
Regadas, Sthela Maria Murad;Regadas, Francisco Sergio P.;Rodrigues, Lusmar Veras;Silva, Flavio Roberto;Lima, Doryane Maria dos Reis;Regadas-Filho, Francisco Sergio Pinheiro;
Arquivos de Gastroenterologia , 2005, DOI: 10.1590/S0004-28032005000400007
Abstract: background: anorectal endosonography is actually the main image exam to evaluate some anorectal diseases. aim: to show the three-dimensional endosonography importance in the anal canal anatomic evaluation and the anorectal diseases diagnosis. methods: seventy four anorectal ultrasound were performed, 23 normal individuals (13 women) and 51 patients (33 women) with benign and malignant diseases. all the patients were examined with a 3-d equipment with 360° transducer. normal individuals were evaluated in midline sagital plane concerning to the length of the anal canal, the internal anal sphincter, the external anal sphincter and the anatomic defect in the anterior quadrant. results: there were no differences in the anal canal and the internal anal sphincter length between men and women. otherwise, the external anal sphincter length is longer in men and the anatomic defect is longer in women. in those with anorectal diseases, 11 sphincter injuries, 8 anal fistulas, 7 abscess, 1 perirectal endometriosis, 1 pre-sacral cyst, 3 anal canal and 10 rectal malignant neoplasias were diagnosed. the surgical findings confirmed the ultrasound diagnosis in all the patients. conclusion: three-dimensional endosonography demonstrated the anatomic differences between male and female anal canal, justifying the larger incidence of pelvic floor disorders in female patients. it was possible to diagnose the anorectal diseases, in multi-plane, with high spatial resolution, adding also important informations about the therapeutic decision. such characteristics become it similar to nuclear magnetic resonance with intra-rectal coil, with the advantages to be easier, quicker, low cost and better tolerated.
Failure of carnitine in improving hepatic nitrogen content in alcoholic and non-alcoholic malnourished rats
Rodrigues, Luciana P.;Portari, Guilherme Vannucchi;Padovan, Gilberto Jo?o;Jord?o, Alceu Afonso;Suen, Vivian;Marchini, Julio Sergio;
Clinics , 2010, DOI: 10.1590/S1807-59322010000900011
Abstract: aims: to investigate the effect of carnitine supplementation on alcoholic malnourished rats' hepatic nitrogen content. methods: malnourished rats, on 50% protein-calorie restriction with free access to water (malnutrition group) and malnourished rats under the same conditions with free access to a 20% alcohol/water solution (alcohol group) were studied. after the undernourishment period (4 weeks with or without alcohol), both groups were randomly divided into two subgroups, one of them nutritionally recovered for 28 days with free access to a normal diet and water (recovery groups) and the other re-fed with free access to diet and water plus carnitine (0.1 g/g body weight/day by gavage) (carnitine groups). no alcohol intake was allowed during the recovery period. results: the results showed: i) no difference between the alcohol/no alcohol groups, with or without carnitine, regarding body weight gain, diet consumption, urinary nitrogen excretion, plasma free fatty acids, lysine, methionine, and glycine. ii) liver nitrogen content was highest in the carnitine recovery non-alcoholic group (from 1.7 to 3.3 g/100 g, p<0.05) and lowest in alcoholic animals (about 1.5 g/100g). iii) hepatic fat content (~10 g/100 g, p>.05) was highest in the alcoholic animals. conclusion: carnitine supplementation did not induce better nutritional recovery.
Madurez de la investigación científica en turismo, en Brasil y en el mundo
Rodrigues Leal,Sergio;
Estudios y perspectivas en turismo , 2006,
Abstract: tourism education and research are reasonably recent in the academy. through the analysis of three indicators pre?established by the author (specialized publications, distinguished researchers and academic conferences), this paper aims to critique the level of academic maturity of tourism education in brazil and in countries with a greater tradition in its offering.
Madurez de la investigación científica en turismo, en Brasil y en el mundo Maturity Levels in Tourism Research in Brazil an Around the World
Sergio Rodrigues Leal
Estudios y perspectivas en turismo , 2006,
Abstract: La formación e investigación en turismo es muy reciente en el ámbito académico. Este estudio pretende discutir a través de tres indicadores preestablecidos por el autor (publicaciones especializadas, investigadores reconocidos y eventos académicos) el nivel de madurez alcanzado por la investigación científica en turismo en Brasil y en los países con mayor tradición en la ense anza de la materia. Tourism education and research are reasonably recent in the academy. Through the analysis of three indicators pre established by the author (specialized publications, distinguished researchers and academic conferences), this paper aims to critique the level of academic maturity of tourism education in Brazil and in countries with a greater tradition in its offering.
Methodology and Equations of Mineral Production Forecast
—Part I. Crude Oil in the UK and Gold in Nevada, USA. Prediction of Late Stages of Production

Sergio Pérez Rodríguez
Open Journal of Geology (OJG) , 2013, DOI: 10.4236/ojg.2013.35040

The equations of mineral production forecast link the change in time of mineral reserves with the production and the ratio of reserves to production. These equations allow us to model the development of the mineral resources evaluated at any scale. Probabilistic bidimensional charts made from montecarlo simulations provide intervals of confidence for the forecasts. The set of equations is devised and presented for a variety of applications to the oil and gas industry, as well to the production of any other mineral resource, either metals or non metals, whose ore deposit volumes and production might be quantified. The cases studied in the UK and USA are at late stages of production, periods for what the equations are most suitable to be applied without further adjustments. Experimental design allows the diagnosis of the likely values of the variables pertaining to the equations, in order to achieve the results provided by conventional production forecasts or to explore other scenarios of investigation. The method can be practical to evaluate commitments of production of mineral resources with time, to support strategic plans for companies, corporations, countries or regions based on those evaluations, for the screening and ranking of mineral assets based on their production potential and many other tasks where the prediction of future volumes of mineral production is required.

Methodology and Equations of Mineral Production Forecast. Part II. The Fundamental Equation. Crude Oil Production in USA  [PDF]
Sergio Pérez Rodríguez
Open Journal of Geology (OJG) , 2013, DOI: 10.4236/ojg.2013.36044

The fundamental equation of mineral production allows to model and design the dynamics of mineral production, however complex they are or could be. It considers not only the case of a constant production to reserves ratio for given intervals of time, but with a piecewise approach, it is also enabled to account the variation on time of this ratio. With a constant production to reserves ratio, the limit expression of the fundamental equation takes the form of an Erlang distribution with a fixed shape parameter. The rate parameter equals the scale factor. The discrete piecewise version, instead of considering the reserves and the production to reserves ratio being constant through certain intervals of time, updates both variables by units of time. This version, using either lineal or non lineal functions for the variables involved, let to model known production profiles or to forecast them by experimental design. The Hubbert’s linearization updated with recent data and the p-box method applied to determine ultimate recovery of U.S. crude oil reserves indicate official accounts underestimate them. The analysis of the ideal model of production based on Hubbert’s linearization and curve, can be made by decomposing it in the distribution with time of the reserves and of the production to reserves ratio. The distribution of reserves with time is synchronized for both the ideal Hubbert’s curve and real profiles, disregarding whether they match or not. The departure of real profiles from the ideal Hubbert’s curve lies on the differences or correspondences of the distribution with time of the production to reserves ratio. The MonteCarlo simulation applied to forecast US crude oil production for the next five years points to a slow decline, with average annual yields presenting a difference lower than 10% between the start and the end of the simulation.

Risk factors and immunological pathways for asthma and other allergic diseases in children: background and methodology of a longitudinal study in a large urban center in Northeastern Brazil (Salvador-SCAALA study)
Mauricio L Barreto, Sergio S Cunha, Neuza Alcantara-Neves, Lain P Carvalho, álvaro A Cruz, Renato T Stein, Bernd Genser, Philip J Cooper, Laura C Rodrigues
BMC Pulmonary Medicine , 2006, DOI: 10.1186/1471-2466-6-15
Abstract: The Salvador-SCAALA project described here is a longitudinal study involving children aged 4–11 years living in the city of Salvador, Northeastern Brazil. Data on asthma and allergic diseases (rhinitis and eczema) and potential risk factors will be collected in successive surveys using standardised questionnaire. This will be completed with data on dust collection (to dust mite and endotoxin), skin test to most common allergens, stool examinations to helminth and parasites, blood samples (to infection, total and specific IgE, and immunological makers), formaldehyde, physical inspection to diagnoses of eczema, and anthropometric measures. Data on earlier exposures when these children were 0–3 years old are available from a different project.It is expected that knowledge generated may help identify public health interventions that may enable countries in LA to enjoy the benefits of a "modern" lifestyle while avoiding – or minimising – increases in morbidity caused by asthma and allergies.The prevalence of asthma and allergic diseases (rhinitis and eczema) has increased in industrialised countries in the last 2 decades [1-3]; in the same countries, there is tendency for the prevalence to be higher in urban than rural areas and to vary according to socio-economic status, although these findings are not consistent in all studies. Allergic disease results from a complex interaction between host genetics and environmental exposures [4] Since changes in host genetics occurring over so short a time scale is an unlikely explanation for the temporal trends in allergy prevalence, it is likely that the marked changes in environmental, life style and living conditions are known to have occurred in the last decades are responsible for these differences. Changes suggested t have contributed include urbanisation, better housing, diet and decreased exposure to infection early in life, and less exposures to helminths and other chronic infections.Among environmental exposures that may
Recovering mitochondrial DNA lineages of extinct Amerindian nations in extant homopatric Brazilian populations
Vanessa F Gon?alves, Flavia C Parra, Higgor Gon?alves-Dornelas, Claudia Rodrigues-Carvalho, Hilton P Silva, Sergio DJ Pena
Investigative Genetics , 2010, DOI: 10.1186/2041-2223-1-13
Abstract: We studied 173 individuals from Queixadinha, a small village located in a territory previously occupied by the now extinct Botocudo Amerindian nation. Pedigree analysis revealed 74 unrelated matrilineages, which were screened for Amerindian mtDNA lineages by restriction fragment length polymorphism. A cosmopolitan control group was composed of 100 individuals from surrounding cities. All Amerindian lineages identified had their hypervariable segment HVSI sequenced, yielding 13 Amerindian haplotypes in Queixadinha, nine of which were not present in available databanks or in the literature. Among these haplotypes, there was a significant excess of haplogroup C (70%) and absence of haplogroup A lineages, which were the most common in the control group. The novelty of the haplotypes and the excess of the C haplogroup suggested that we might indeed have identified Botocudo lineages. To validate our strategy, we studied teeth extracted from 14 ancient skulls of Botocudo Amerindians from the collection of the National Museum of Rio de Janeiro. We recovered mtDNA sequences from all the teeth, identifying only six different haplotypes (a low haplotypic diversity of 0.8352 ± 0.0617), one of which was present among the lineages observed in the extant individuals studied.These findings validate the technique of homopatric targeting as a useful new strategy to study the peopling and colonization of the New World, especially when direct analysis of genetic material is not possible.When Europeans arrived in Brazil in 1500, they found more than two million Amerindians [1], many of them inhabiting the eastern part of the country. Five hundred years later, in the 2000 Brazilian census, there remained only 734 thousand Amerindians in Brazil, almost all of them living in the northern (Amazon region) and the western states. We know almost nothing about the genetic makeup of the once numerous Amerindian populations that lived in the eastern part of Brazil. Even the historical evidence th
Influence of age, mode of delivery and parity on the prevalence of posterior pelvic floor dysfunctions
Murad-Regadas, Sthela Maria;Regadas, Francisco Sergio P;Rodrigues, Lusmar Veras;Furtado, Débora Couto;Gondim, Ana Cecília;Dealcanfreitas, íris Daiana;
Arquivos de Gastroenterologia , 2011, DOI: 10.1590/S0004-28032011000400009
Abstract: context: the correlation between vaginal delivery, age and pelvic floor dysfunctions involving obstructed defecation is still a matter of controversy. objectives: to determine the influence of age, mode of delivery and parity on the prevalence of posterior pelvic floor dysfunctions in women with obstructed defecation syndrome. methods: four hundred sixty-nine females with obstructed defecation syndrome were retrospectively evaluated using dynamic 3d ultrasonography to quantify posterior pelvic floor dysfunctions (rectocele grade ii or iii, rectal intussusception, paradoxical contraction/non-relaxation of the puborectalis and entero/ sigmoidocele grade iii). in addition, sphincter damage was evaluated. patients were grouped according to age (<50y x >50y) and stratified by mode of delivery and parity: group i (<50y): 218 patients, 75 nulliparous, 64 vaginal delivery and 79 only cesarean section and group ii (>50y): 251 patients, 60 nulliparous, 148 vaginal delivery and 43 only caesarean section. additionally, patients were stratified by number of vaginal deliveries: 0 - nulliparous (n = 135), 1 - vaginal (n = 46), >1 - vaginal (n = 166). results: rectocele grade ii or iii, intussusception, rectocele + intussusception and sphincter damage were more prevalent in group ii (p = 0.0432; p = 0.0028; p = 0.0178; p = 0.0001). the stratified groups (nulliparous, vaginal delivery and cesarean) did not differ significantly with regard to rectocele, intussusception or anismus in each age group. entero/sigmoidocele was more prevalent in the vaginal group <50y and in the nulliparous and vaginal groups >50y. no correlation was found between rectocele and the number of vaginal deliveries. conclusion: higher age (>50 years) was shown to influence the prevalence of significant rectocele, intussusception and sphincter damage in women. however, delivery mode and parity were not correlated with the prevalence of rectocele, intussusception and anismus in women with obstructed defecation.
Management of patients with rectocele, multiple pelvic floor dysfunctions and obstructed defecation syndrome
Murad-Regadas, Sthela Maria;Regadas, Francisco Sergio P.;Rodrigues, Lusmar Veras;Fernandes, Graziela Olivia da Silva;Buchen, Guilherme;Kenmoti, Viviane T.;
Arquivos de Gastroenterologia , 2012, DOI: 10.1590/S0004-28032012000200008
Abstract: context: management of patients with obstructed defecation syndrome is still controversial. objective: to analyze the efficacy of clinical, clinical treatment followed by biofeedback, and surgical treatment in patients with obstructed defecation, rectocele and multiple dysfunctions evaluated with echodefecography. methods: the study included 103 females aged 26-84 years with obstructed defecation, grade-ii/iii rectocele and multiple dysfunctions on echodefecography. patients were distributed into three treatment groups and constipation scores were assigned. group i: 34 (33%) patients with significant improvement of symptoms through clinical management only. group ii: 14 (14%) with improvement through clinical treatment plus biofeedback. group iii: 55 (53%) referred to surgery due to treatment failure. results: group i: 20 (59%) patients had grade-ii rectocele, 14 (41%) grade-iii. obstructed defecation syndrome was associated with intussusception (41%), mucosal prolapse (41%), anismus (29%), enterocele (9%) or 2 dysfunctions (23%). the average constipation score decreased significantly from 11 to 5. group ii: 11 (79%) grade-ii rectocele, 3 (21%) grade-iii, associated with intussusception (7%), mucosal prolapse (43%), anismus (71%) or 2 dysfunctions (29%). there was significant decrease in constipation score from 13 to 6. group iii: 8 (15%) grade-ii rectocele, 47 (85%) grade-iii, associated with intussusception (42%), mucosal prolapse (40%) or 2 dysfunctions (32%). the constipation score remained unchanged despite clinical treatment and biofeedback. twenty-three underwent surgery had a significantly decrease in constipation score from 12 to 4. the remaining 32 (31%) patients which 22 refused surgery, 6 had low anal pressure and 4 had slow transit. conclusions: approximately 50% of patients with obstructed defecation, rectocele and multiple dysfunctions presented a satisfactory response to clinical treatment and/or biofeedback. surgical repair was mainly required in pa
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