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Search Results: 1 - 10 of 405146 matches for " Eidla M. M. Nascimento "
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Antibacterial activity of Momordica charantia
José Galberto M. Costa,Eidla M. M. Nascimento,Fabiola F. G. Rodrigues,Adriana R. Campos
Journal of Basic and Clinical Pharmacy , 2011,
Abstract: Momordica charantia L. belongs to the family Curcubitaceae and it isvery common in many Brazilian regions. The plant is a liana with flowers and yellow fruits that present red seeds when are ripe. Popularly known as “mel o-de-s ocaetano”,“mel o amargo” or “caba o-amargo”, it possesses many uses: antidiabetic,antihelmintic, antmicrobial, anticancerigenous and antioxidant. The phytochemicalprospection of the fresh and dried leaves extracts showed the presence of different classes of secondary metabolites, asflavonoids, alkaloids and tannins, that have demonstratedantimicrobial action. Fresh and dried leaves presented significantly antimicrobial activity against all bacterial strains tested, specially Escherichia coli. Ethyl acetate fractions were effective against Escherichia coli and Bacillus cereus. The modulatory activity was significative too.
Chemical Characterization of Auriferous Ores from the Brazilian State of Paraiba  [PDF]
Marcelo Rodrigues do Nascimento, Artur M. G. Louren?o
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2015, DOI: 10.4236/jmmce.2015.31002
Abstract: One of the most important problems facing the gold industry is that the placer and free milling gold ores are almost terminating. Hence, the use of refractory ores has been increased during the recent years. In general, gold refractory ores occurs in various types of deposits associated with a range of minerals. Among the refractory ores, the sulfide type is the most common. The methodology employed in the mining process depends on the mode of occurrence of the ore and on the particle size, shape and degree of purity of the auriferous species. We have undertaken a mineralogical investigation of a representative sample of a complex gold mining ore collected in the municipality of Princesa Isabel, Paraiba, Brazil, using X-ray fluorescence spectrometry, X-ray diffractometry, infrared spectroscopy, inductively coupled plasma-atomic emission spectrometry and the Fire Assay. The results showed that the arsenic content of the ore was closely related to the gold content, and that the occurrence of “invisible gold” was associated primarily with pyrite and secondarily with arsenopyrite. The sulfur content of the ore was directly related to its refractoriness. It is concluded that gold mineralization in the study area is mainly of the gold-quartz-sulfide veins (lode gold), while the gold found in the mini-fractures of the deposits is probably associated with the hydrothermal processes that occurred in the region.
Antibioticoterapia ambulatorial como fator de indu??o da resistência bacteriana: uma abordagem racional para as infec??es de vias aéreas
Nascimento-Carvalho, Cristiana M.;
Jornal de Pediatria , 2006, DOI: 10.1590/S0021-75572006000700004
Abstract: objectives: to present evidence-based recommendations for the use of antibiotics for the treatment of the most common acute respiratory infections (ari) and the available information on the importance of this type of management. sources: medline and lilacs databases, technical publications by international organizations, national and international directives. the search terms acute respiratory infection, otitis, sinusitis, tonsillitis, pneumonia, antibiotic, guidelines and bacterial resistance were used. articles cited by the articles selected were analyzed for information of interest. summary of the findings: bacterial resistance has grown, to the extent that today it is recognized as a global public health problem. ari are the most common cause of antibiotic usage within the community; yet a large proportion of these cases, compromising the upper (otitis, sinusitis, tonsillitis) or the lower airways (pneumonia), are the result of viral infections. recommendations to rationalize the use of antibiotics in patients with ari have the common objective of minimizing unnecessary antibiotic use, since "antibiotic pressure" is one of the factors triggering bacterial resistance. conclusions: it is of great importance to differentiate among ari patients those who will benefit from the use of antibiotics. the establishment of recommendations for the prescription of antibiotics is one strategy for minimizing the frequency of bacterial resistance.
Social Representation of the Universe - A Study with Doctors in Human and Natural Sciences
Nascimento-Schulze, Clelia, M.
Papers on Social Representations , 1999,
Abstract:
School resources and student achievment: worldwide findings and methodological issues
Paulo A. Meyer. M. Nascimento
Educate~ , 2008,
Abstract: The issues raised in the Education Production Function literature since the US 1966 Coleman Report have fuelled high controversy on the role of school resources in relation to student performance. In several literature reviews and some self estimates, Erik Hanushek (1986, 1997, 2006) systematically affirms that these two factors are not associated one to another – neither in the US nor abroad. In recent cross-country analyses, Ludger Woessmann (2003; 2005a; 2005b) links international differences in attainment to institutional differences across educational systems – not to resourcing levels. In the opposite direction, Stephen Heyneman and William Loxley (1982, 1983) tried to demonstrate in the 1980’s that, at least for low income countries, school factors seemed to outweigh family characteristics on the determination of students’ outcomes – although other authors show evidence that such a phenomenon may have existed only during a limited period of the 20th Century. In the 1990s, meta-analyses raised the argument that school resources were sufficiently significant to be regarded as pedagogically important. The turn of the Century witnessed a new movement: the recognition that endogenous determination of resource allocation is a substantial methodological issue. Therefore, efforts have been made to incorporate the decision-making processes that involve families, schools and policy-makers in economic models. This implies changes in research designs that may affect the direction of future policy advices patronised by international development and educational organisations.
The arboreal component of a dry forest in Northeastern Brazil
Rodal, M. J. N.;Nascimento, L. M.;
Brazilian Journal of Biology , 2006, DOI: 10.1590/S1519-69842006000300014
Abstract: the dry forests of northeastern brazil are found near the coastal zone and on low, isolated mountains inland amid semi-arid vegetation. the floristic composition of these dry montane forests, as well as their relationship to humid forests (atlantic forest sensu stricto) and to the deciduous thorn woodlands (caatinga sensu stricto) of the brazilian northeast are not yet well known. this paper sought to determine if the arboreal plants in a dry forest growing on a low mountain in the semi-arid inland region (serra negra, 8° 35? - 8° 38? s and 38° 02? - 38° 04? w) between the municipalities of floresta and inajá, state of pernambuco have the same floristic composition and structure as that seen in other regional forests. in fifty 10 x 20 m plots all live and standing dead trees with trunk measuring > 5 cm diameter at breast height were measured. floristic similarities between the forest studied and other regional forests were assessed using multivariate analysis. the results demonstrate that the dry forest studied can be classified into two groups that represent two major vegetational transitions: (1) a humid forest/dry forest transition; and (2) a deciduous thorn-woodland/ dry forest transition.
Raising awareness of chronic kidney disease in a Brazilian urban population
Mazza Nascimento, M.;Riella, M.C.;
Brazilian Journal of Medical and Biological Research , 2009, DOI: 10.1590/S0100-879X2009000800010
Abstract: the incidence and prevalence of chronic kidney disease have been increasing in recent years in developing countries. the aim of this study was to report the results of a general chronic kidney disease awareness program applied to an urban population in a large brazilian city. from january 2002 to january 2005 a total of 8883 individuals in the city of curitiba (pr, brazil) were screened for hypertension, body mass index, hematuria, and proteinuria. a family history and previous medical diagnosis of hypertension and diabetes mellitus (dm) were also recorded. of the 8883 individuals assessed, 56% were women, subject median age was 47 years (range: 17-93 years) and more than 90% were caucasian. thirty percent had signs of hematuria, 6% had proteinuria, and 3% had hematuria and proteinuria. the median of mean arterial pressure values was 93 mmhg (range: 71-135 mmhg) and 16% of the population screened had a history of hypertension. a significant positive family history of both hypertension or dm was present in 42% (p < 0.0001; chi-square = 83.18) and 7% (p < 0.0001; chi-square = 161.31) of the hypertensive group, respectively. finally, the prevalence of hypertension and dm was significantly higher in older individuals with proteinuria. in the present study, a higher prevalence of hematuria and proteinuria was found in older individuals with hypertension and diabetes compared to the general population. these data confirm the need for public awareness of renal disease in high-risk individuals.
On the formation mechanisms of hydrogen ionic clusters
Barbatti, M.;Nascimento, M. A. C.;
Brazilian Journal of Physics , 2003, DOI: 10.1590/S0103-97332003000400032
Abstract: structural and thermodynamic properties of hydrogen molecular clusters formed around an atomic or molecular cation are examined. the shell distribution of h2 molecules and the size of the clusters are discussed. the bloom-margenau model for predicting the number of neutral molecules that could bind to a cation core is investigated and its limitations are illustrated using the li+(h2)k clusters as test case. finally, results for the entropy of the h+n clusters (n = 5 - 27, odd) and for the gibbs free energy variations associated to the cluster formation are presented and the spontaneity of the clustering process in different conditions is examined.
On the formation mechanisms of hydrogen ionic clusters
Barbatti M.,Nascimento M. A. C.
Brazilian Journal of Physics , 2003,
Abstract: Structural and thermodynamic properties of hydrogen molecular clusters formed around an atomic or molecular cation are examined. The shell distribution of H2 molecules and the size of the clusters are discussed. The Bloom-Margenau model for predicting the number of neutral molecules that could bind to a cation core is investigated and its limitations are illustrated using the Li+(H2)k clusters as test case. Finally, results for the entropy of the H+n clusters (n = 5 - 27, odd) and for the Gibbs free energy variations associated to the cluster formation are presented and the spontaneity of the clustering process in different conditions is examined.
Test of Anderson-Stuart model in sodium silicate glasses and the general Arrhenian conductivity rule in wide composition range
Nascimento, M. L. F.;Nascimento, E.;Pontuschka, W. M.;Matsuoka, M.;Watanabe, S.;
Ceramica , 2006, DOI: 10.1590/S0366-69132006000100004
Abstract: we collected and analyzed literature data on ionic conductivity s and activation energy ea in the binary sodium silicate system in a wide composition range. the anderson and stuart model has been considered to describe the decreasing tendency of activation energy ea with alkali concentration in this system. in this analysis were considered experimental parameters, such as shear modulus g and relative dielectric permittivity e. a general conductivity rule is found in 194 of 205 glasses, when one plots log s vs. ea/kb t, where kb is the boltzmann constant and t is the absolute temperature. this fact means that the arrhenian relation has universal uniqueness of form s = s (ea,t) in wide na2o composition range. the results also show that there is strong correlation by more than 19 orders of magnitude on conductivity with ea/kbt. an explanation for this behavior links ionic conductivity and microscopic structure. the problem of phase separation in this system is also considered.
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