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Search Results: 1 - 10 of 467484 matches for " Nelson Fortes;Mendon?a "
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Analysis of parahippocampal gyrus in 115 patients with hippocampal sclerosis
Ferreira, Nelson Fortes;Oliveira, Vanessa de;Amaral, Lázaro;Mendona, Renato;Lima, Sérgio Santos;
Arquivos de Neuro-Psiquiatria , 2003, DOI: 10.1590/S0004-282X2003000500001
Abstract: purpose: analysis of the parahippocampal gyrus (phg) involvement in 115 patients with hippocampal sclerosis (hs) by mr imaging. the simultaneous occurrence of ipsilateral fornix (f) and mamillary body (mb) volume loss was checked also. these findings were correlated with the side of hippocampal involvement, the sex, patient′s age, and the symptoms onset. method: the mr images of 115 patients with hs were studied retrospectively. all the examinations were performed on 1.5 t units (signa, ge, milwaukee, wi) and included high resolution coronal t2-weighted images (3 mm thickness, 0.6 mm gap). results: the patient's age ranged between 3.5 and 80 years (mean 34.1); 62 (53.9%) were female and 53 (46.1%) were male. there were hs on the left side in 53 (46.0%), on the right side in 51 (44.3%), and bilateral in 11 (9.7%). in 43 (37.3%) cases there were ipsilateral phg volume loss and signal hyper intensity on t2-weighted imaging. in 29 (25.2%) cases there were ipsilateral fornix volume loss and in 10 (34.5%) of this there were also ipsilateral mb changes. in abnormal phg, 23 (53.4%) were on the left side, 17 (39.5%) were on the right side, and 3 (7.1%) were bilateral. there were fornix changes in 15 (34.8%) cases and mb volume loss in 5 (11.6%) cases. pertinent clinical data were obtained in only 18 (41.8%) of the phg lesion cases and 11 (61.1%) of these patients had epileptic attacks for more than 20 years before the examination. conclusion: phg involvement must be investigated in patients with hs and we suggest that the term mesial temporal sclerosis should be used only if there are also changes at this anatomical site.
Analysis of parahippocampal gyrus in 115 patients with hippocampal sclerosis
Ferreira Nelson Fortes,Oliveira Vanessa de,Amaral Lázaro,Mendona Renato
Arquivos de Neuro-Psiquiatria , 2003,
Abstract: PURPOSE: Analysis of the parahippocampal gyrus (PHG) involvement in 115 patients with hippocampal sclerosis (HS) by MR imaging. The simultaneous occurrence of ipsilateral fornix (F) and mamillary body (MB) volume loss was checked also. These findings were correlated with the side of hippocampal involvement, the sex, patient′s age, and the symptoms onset. METHOD: The MR images of 115 patients with HS were studied retrospectively. All the examinations were performed on 1.5 T units (SIGNA, GE, Milwaukee, WI) and included high resolution coronal T2-weighted images (3 mm thickness, 0.6 mm gap). RESULTS: The patient's age ranged between 3.5 and 80 years (mean 34.1); 62 (53.9%) were female and 53 (46.1%) were male. There were HS on the left side in 53 (46.0%), on the right side in 51 (44.3%), and bilateral in 11 (9.7%). In 43 (37.3%) cases there were ipsilateral PHG volume loss and signal hyper intensity on T2-weighted imaging. In 29 (25.2%) cases there were ipsilateral fornix volume loss and in 10 (34.5%) of this there were also ipsilateral MB changes. In abnormal PHG, 23 (53.4%) were on the left side, 17 (39.5%) were on the right side, and 3 (7.1%) were bilateral. There were fornix changes in 15 (34.8%) cases and MB volume loss in 5 (11.6%) cases. Pertinent clinical data were obtained in only 18 (41.8%) of the PHG lesion cases and 11 (61.1%) of these patients had epileptic attacks for more than 20 years before the examination. CONCLUSION: PHG involvement must be investigated in patients with HS and we suggest that the term mesial temporal sclerosis should be used only if there are also changes at this anatomical site.
Estudo através da ressonancia magnética de 67 casos de glioblastoma multiforme e a ocorrência de metástases
Ferreira Nelson Fortes,Barbosa Marcelo,Amaral Lazaro L. Faria do,Mendona Renato Adam
Arquivos de Neuro-Psiquiatria , 2004,
Abstract: OBJETIVO: Demonstrar as características de imagem do glioblastoma multiforme, tumor primário mais comum do sistema nervoso central, com ênfase em suas localiza es, ocorrência de metástases e rela o com o grau de necrose demonstrado por ressonancia magnética (RM). MéTODO: Foram analizados retrospectivamente 67 casos de ressonancia magnética de pacientes com diagnóstico histológico de glioblastoma multiforme, retirados do arquivo didático da MED IMAGEM. Todos os exames foram realizados em aparelhos GE de 1,5 T. (GE- Medical Systems), no período compreendido entre janeiro de 1995 e maio de 2003. RESULTADOS: Nos 67 casos estudados, a idade dos pacientes variou entre 4 e 86 anos, com idade média de 60 anos. Houve predominancia no sexo masculino, com 39 casos (58%). A localiza o frontal foi preponderante (47%) seguida de 18% na regi o temporal e 16% na regi o parietal. Em 19% se localizou em outros sítios. O aparecimento de metástases ocorreu em 15 casos. CONCLUS O: Concordante com a literatura o glioblastoma multiforme predomina nos lobos frontais e acomete preferencialmente pacientes com idade acima de 50 anos. O aparecimento de metástases em nossos casos ocorreu em 22%.
Ununsual manifestations of neurocysticercosis in MR imaging: analysis of 172 cases
Amaral, Lázaro;Maschietto, Murilo;Maschietto, Roberta;Cury, Ricardo;Ferreira, Nelson Fortes;Mendona, Renato;Lima, Sérgio Santos;
Arquivos de Neuro-Psiquiatria , 2003, DOI: 10.1590/S0004-282X2003000400002
Abstract: purpose: the typical manifestations of neurocysticercosis are described widely in the literature. the purpose of this study is to demonstrate the uncommon presentations of different forms of neurocysticercosis in mr imaging. method: a retrospective analysis of 172 cases of neurocysticercosis in mr studies was carried out over a period of 13 years. one hundred and four males and 68 females with a mean age of 32 ± 3.7 years were studied. the studies were performed on 1.5 t ge mr units and t1 was used before and after gadolinium injection, t2 and gradient-echo (t2*) sequences. results: the authors divided the unusual manifestations of neurocysticercosis into: intraventricular, subarachnoid, spinal, orbital, intraparenchymatous, and reactivation of previously calcified lesions. the results obtained were: intraparenchymatous 95 cases (55.23%); intraventricular 27 cases (15.69%); subarachnoid 20 cases (11.63%); spinal 6 cases (3.49%); orbital 1 case (0.58%); reactivated lesion 1 case (0.58%); association of intraventricular and intraparenchymatous 12 cases (6.98%); association of subarachnoid and intraparenchymatous 6 cases (3.49%); association of subarachnoid and intraventricular, 4 cases (2.32%). conclusion: mr imaging is a sensitive and specific method in the analysis of different forms of unusual manifestations of neurocysticercosis, which should appear in the differential diagnosis of parenchymal, ventricular, spinal, cisternal, and orbital lesions.
MR imaging for evaluation of lesions of the cranial vault: a pictorial essay
Amaral, Lázaro;Chiurciu, Miriam;Almeida, Jo?o Ricardo;Ferreira, Nelson Fortes;Mendona, Renato;Lima, Sérgio Santos;
Arquivos de Neuro-Psiquiatria , 2003, DOI: 10.1590/S0004-282X2003000400001
Abstract: purpose: a variety of diseases affect the calvaria. they may be identified clinically as palpable masses or incidentally in radiologic examinations. there are many diagnostic possibilities, including congenital, neoplastic, inflammatory and traumatic lesions. the purpose of this study is to illustrate the main calvarial lesions through mr imaging, their signal intensity and extension to neighboring sites. method: a retrospective analysis of 81 cases, from november 1996 to july 2001, was conducted. the examinations were performed on a 1.5 t equipment and each one of the cases was pathologically proven. results: the results were: dermoid cysts [4 cases (5%)], epidermoid cysts [2 cases (2.5%)], cephalocele [14 cases (17.5%)], sinus pericranii [3 cases (3.7%)], leptomeningeal cysts [4 cases (5%)], langerhans cell histiocytosis [10 cases (12.5%)], lipoma [4 cases (5%)], fibrous dysplasia [13 cases (16.2%)], osteoma [8 cases (10%)], hemangioma [1 case (1.2%)], meningioma [3 cases (3.7%)], chondrosarcoma [5 cases (6.2%)], hemangiosarcoma [1 case (1.2%)], multiple myeloma [3 cases (3.7%)], sarcomatous transformation of paget disease [1 case (1.3%)], and metastasis [5 cases (6.2%)]. conclusion: mri identifies bone marrow abnormalities and invasion of adjacent tissues at an early stage. therefore, it is an essential method when it commes to properly evaluating calvarial lesions.
Estudo através da ressonancia magnética de 67 casos de glioblastoma multiforme e a ocorrência de metástases
Ferreira, Nelson Fortes;Barbosa, Marcelo;Amaral, Lazaro L. Faria do;Mendona, Renato Adam;Lima, Sérgio Santos;
Arquivos de Neuro-Psiquiatria , 2004, DOI: 10.1590/S0004-282X2004000400024
Abstract: purpose: the purpose of this paper is to demonstrate the main mri characteristics of glioblastoma multiforme (gbm), the most common cns primary tumor, emphasizing its location and the occurrence of metastases. method: the mr imaging of 67 pathologically proven cases of glioblastoma multiforme were retrospectively reviewed. the exams were realized in the period between 1995 and 2003, in one of three 1.5 signa ge units (milwaukee, wi). results: the ages of the patients ranged from 4 years to 86 years, mean 60 years, and the occurrence of the tumor was preponderant among men, with 39 cases (58%). the most common location was in the frontal lobes (47%) followed by the temporal lobes (18%) and the parietal lobes (16%). in 19% of the cases there were involvement of more than one site and long distance metastases were seen in 22% of the patients. conclusion: according to the literature, the most common location of gbm was in the frontal lobe of older than 50 years old men. metastases occurred in 22% of our cases.
Estado patrimonial e gest?o democrática do ensino público no Brasil
Mendona, Erasto Fortes;
Educa??o & Sociedade , 2001, DOI: 10.1590/S0101-73302001000200007
Abstract: this article approaches the democratic management of public education in brazil. it seeks to assess how the education systems of the states, the federal district, and state capitals have been organized to meet the constitutional provisions that established democratic management as a public education principle, and at which level they adapted their legislation and rules, as well as their administrative framework, to participation demands. it analyzes the democratic management concepts vis-à-vis participation, principals assignment processes, the constitution and functioning of support committees within the schools, decentralization, and autonomy. it also mentions recent studies and research on the efforts and resistances found in the implementation of democratic management mechanisms in different education systems. it builds on the fact that the democratic management is adopted by the state as a means to achieve strategic targets and analyses the difficulties resulting from the implementation of such mechanisms, since these presuppose a high level of social participation but are sponsored by a state model strongly characterizes by patrimonialistic arrangements.
Estado patrimonial e gest o democrática do ensino público no Brasil
Mendona Erasto Fortes
Educa??o & Sociedade , 2001,
Abstract: O artigo aborda o tema da Gest o Democrática do Ensino Público no Brasil. Busca identificar como os sistemas de ensino dos estados, do Distrito Federal e dos municípios das capitais organizaram-se para responder ao ordenamento constitucional que estabeleceu a gest o democrática como princípio do ensino público e em que níveis adaptaram suas legisla es e normas, sua estrutura administrativa e seu funcionamento às demandas por participa o. Analisa as concep es de gest o democrática à luz das categorias participa o, processo de indica o de diretores, constitui o e funcionamento de colegiados, descentraliza o e autonomia. Aponta estudos e pesquisas recentes sobre os esfor os e as resistências verificados em processos de implementa o de mecanismos de gest o democrática em diversos sistemas de ensino. Considera que a gest o democrática é adotada pelo Estado para alcan ar seus objetivos estratégicos. Analisa as dificuldades decorrentes da implanta o desses mecanismos que, pressupondo forte participa o da sociedade, é patrocinada por um Estado fortemente marcado por ordenamentos patrimonialistas.
Estudos s?bre a conserva??o de sementes: XII - Melancia
Zink, Eduardo;Mendona, Nelson Teixeira de;
Bragantia , 1964, DOI: 10.1590/S0006-87051964000100028
Abstract: the viability of watermelon seeds kept under different storage conditions, was studied during a period of 18 months. the experimental results presented in this paper drew the following conclusions: 1) complete viability at the end of 18 months was obtained for seeds stored at 20°c and at relative humidity of 45%. 2) at this same temperature, the longevity of the seeds decreased with the increasing of relative humidity. 3) seeds kept at 30°c, even in low relative humidity condition, lost their viability in a short time. 4) the seeds of watermelon stored in airtight containers at room temperature, kept their viability well for 12 months, after which time it decreased considerably.
Primary Separation of Antioxidants (Unsaponifiables) the Wet Biomass Microalgae Chlamydomonas sp. and Production of the Biodiesel  [PDF]
Gisel Chenard Díaz, Yordanka Reyes Cruz, Mariana Monteiro Fortes, Carolina Vieira Viegas, René González Carliz, Nelson C. Furtado, Donato A. Gomes Aranda
Natural Science (NS) , 2014, DOI: 10.4236/ns.2014.615108
Abstract: This work studies the saponification which directs the wet biomass of algae Chlamydomonas sp. like a previous stage to production of biodiesel. This stage allows the obtainment of fatty acids to produce biodiesel, instead of the gross lipid fraction. In addition of the fatty acids, utilizing the same process one can also obtain the fraction unsaponifiable, these are soluble in apolar solvents and contain mainly carotenoids that can take action as antioxidants and photoprotectors, as they reduce the oxidation of unsaturated fatty acids. The saponification direct and extraction of fatty acids from biomass is faster and reduces the time and cost of operation. The separation of unsaponifiable matter from the biomass humid of microalgae Chlamydomonas sp., was held according to the method AOCS (Ca 6a-40), using extraction Liquid-liquid with hexane as solvent. Subsequently, phase hydroalcoholic or from soap, containing fatty acids, was acidified by addition of H2SO4 and the fatty acids were recovered by the addition of hexane. After acidulation of the soap, necessary for obtaining of the fatty acids was performed the stage of esterification for obtaining of biodiesel. The operating conditions were: molar ratio fatty acid:methanol (1:10), as catalyst 8% H2SO4 calculated in relation to the mass of fatty acid, 200 and reaction time of 90 minutes. The content of methyl esters was 96.8% determined by gas chromatography according to standard EN14103. The quality of biodiesel produced from wet biomass of Chlamydomonas sp. is according to the specification established by standard EN 14214 and RANP No. 14. For the identification of the composition the unsaponifiable fraction was used the method of High Performance Liquid Chromatography (HPLC). The composition of the material unsaponifiable found was of: Carotenoids total (0.76%); Lutein (0.45%); Zeaxanthin (0.07%); α-carotene (0.05%); β-carotene (0.11%); 13 cisβ-carotene (0.05%) and 9-cisβ-carotene (0.03%).
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