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Search Results: 1 - 10 of 401989 matches for " Bárbara J.;Etchebehere "
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Laterization of epileptiform discharges in patients with epilepsy and precocious destructive brain insults
Teixeira, Ricardo A.;Li, Li M.;Santos, Sergio L.M.;Amorim, Bárbara J.;Etchebehere, Elba C.S.C.;Zanardi, Ver?nica A.;Guerreiro, Carlos A.M.;Cendes, Fernando;
Arquivos de Neuro-Psiquiatria , 2004, DOI: 10.1590/S0004-282X2004000100001
Abstract: unilateral destructive brain lesions of early development can result in compensatory thickening of the ipsilateral cranial vault. the aim of this study was to determine the frequency of these bone changes among patients with epilepsy and precocious destructive lesions, and whether a relationship exists between these changes and epileptiform discharges lateralization. fifty-one patients had their ictal / interictal scalp eeg and skull thickness symmetry on mri analyzed. patients were divided into three main groups according to the topographic distribution of the lesion on the mri: hemispheric (h) (n=9); main arterial territory (at) (n=25); arterial borderzone (bdz) (n=17). the eeg background activity was abnormal in 26 patients and were more frequent among patients of group h (p= 0.044). thickening of the skull was more frequent among patients of group h (p= 0.004). five patients (9.8%) showed discordant lateralization between epileptiform discharges and structural lesion (four of them with an abnormal background, and only two of them with skull changes). in one of these patients, ictal spect provided strong evidence for scalp eeg false lateralization. the findings suggest that compensatory skull thickening in patients with precocious destructive brain insults are more frequent among patients with unilateral and large lesions. however, eeg lateralization discordance among these patients seems to be more related to eeg background abnormalities and extent of cerebral damage than to skull changes.
Brain hypoperfusion in adolescents dependent of multiple drugs
Etchebehere, Elba Cristina Sá de Camargo;Oliveira, Felipe Martins;Amorim, Bárbara Juarez;Serrat, Saulo Monte;Camargo, Edwaldo Eduardo;
Arquivos de Neuro-Psiquiatria , 2010, DOI: 10.1590/S0004-282X2010000200002
Abstract: brain spect imaging (bsi) with statistical parametric mapping (spm) offers a clear and accurate vision of perfusion changes. objective: to study brain perfusion abnormalities in adolescents' dependent of multiple drugs. method: sixteen male patients (15.1±2.1 years) were submitted to 99mtc-hmpao bsi with spm. results: cortical hypoperfusion occurred in 7/16 patients (44%). there was a significant inverse correlation between the number of hypoperfused regions and the patient's age (p= -0.6737; p=0.004) and with the age when the drug dependence began (p= -0.5616; p=0.023). there was also a tendency towards an inverse correlation between regions of hypoperfusion and the duration of the drug dependence. conclusion: bsi with spm can help detect hypoperfusion in adolescents dependent on multiple drugs. the younger the patients, the more regions of hypoperfusion are noted. probably, the neuronal plasticity has an important role in this phenomenon because the highest neural activity occurs in childhood.
Controle automatizado de casas de vegeta??o: variáveis climáticas e fertiga??o
Teruel, Bárbara J.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2010, DOI: 10.1590/S1415-43662010000300001
Abstract: the application of techniques of automation and control in greenhouses began in the years 50, starting with the control of temperature through thermostats. since then, technological changes have covered all aspects that make up the system, from constructional features up to aspects of sustainability. the control of parameters sulh as, temperature and relative humidity, solar radiation, the concentration of co2, ventilation and fertigation, had significant development, from which it provides a review of published works about these themes in recent years. currently, issues related to reducing the impact to the environment and efficient production and quality, are taking the greenhouses towards precision agriculture.
Statistical voxel-wise analysis of ictal SPECT reveals pattern of abnormal perfusion in patients with temporal lobe epilepsy
Amorim, Bárbara Juarez;Etchebehere, Elba Cristina Sá de Camargo;Camargo, Edwaldo Eduardo;Rio, Pablo Augusto;Bonilha, Leonardo;Rorden, Chris;Li, Li Min;Cendes, Fernando;
Arquivos de Neuro-Psiquiatria , 2005, DOI: 10.1590/S0004-282X2005000600014
Abstract: objective: to investigate the pattern of perfusion abnormalities in ictal and interictal brain perfusion spect images (bsi) from patients with temporal lobe epilepsy (tle). method: it was acquired interictal and ictal bsi from 24 patients with refractory tle. bsis were analyzed by visual inspection and statistical parametric mapping (spm2). statistical analysis compared the patients group to a control group of 50 volunteers. the images from patients with left-tle were left-right flipped. results: it was not observed significant perfusional differences in interictal scans with spm. ictal bsi in spm analysis revealed hyperperfusion within ipsilateral temporal lobe (epileptogenic focus) and also contralateral parieto-occipital region, ipsilateral posterior cingulate gyrus, occipital lobes and ipsilateral basal ganglia. ictal bsi also showed areas of hypoperfusion. conclusion: in a group analysis of ictal bsi of patients with tle, voxel-wise analysis detects a network of distant regions of perfusional alteration which may play active role in seizure genesis and propagation.
A new species and a new record of Nesticus from southeastern Brazil (Araneae: Nesticidae)
Faleiro, Bárbara T.;Santos, Adalberto J.;
Zoologia (Curitiba) , 2011, DOI: 10.1590/S1984-46702011000200014
Abstract: a new species of nesticus is described based on specimens collected during a structured inventory of the reserva particular do patrim?nio natural mata samuel de paula, state of minas gerais, brazil. nesticus ivone sp. nov. can be recognized by the paracymbium of the male palpus with three not hooked processes, and by the presence of a central vulval plate in the female epigynum. additionally, a new record is presented for nesticus taim ott & lise, 2002, extending the known distribution range of this species northwards.
Silver Nanoparticles Produced by Magnetron Sputtering and Selective Nanodecoration onto α-Cyclodextrin/Carboxylic Acid Inclusion Compounds Crystals  [PDF]
Bárbara Herrera, Tamara Bruna, Daniel Guerra, Nicolás Yutronic, Marcelo J. Kogan, Paul Jara
Advances in Nanoparticles (ANP) , 2013, DOI: 10.4236/anp.2013.22019
Abstract:
In this work, we report the preparation of silver nanoparticles (AgNPs) and the nanodecoration of α-cyclodextrin inclusion compounds (α-CD IC) microcrystals that contain palmitic (PAc) and stearic acids (SAc) like guest molecules. These IC provide a suitable environment for nucleation, epitaxial growth and immobilization of AgNPs that were obtained by the magnetron sputtering technique. The use of α-CD IC substrates with a specific surface morphology in which the functional group of the guest molecule faces outward preferentially from a crystal plane, is an efficient method for the preparation of AgNPs with a low size dispersion, which is probably due to the high affinity between the functional group of the surfactant carboxylic acid guest with the metal nanoparticles.

Indicators Benchmarking of Cement-Based Construction Technologies: Brazilian Case Study  [PDF]
Alberto Casado Lordsleem Júnior, Bárbara Eloá Gon?alves de Lima
Open Journal of Civil Engineering (OJCE) , 2014, DOI: 10.4236/ojce.2014.44025
Abstract: The adoption of performance indicators promotes knowledge of quantitative and qualitative material wastes in businesses and, when inserted in a collaborative process, provides a comparative evaluation of results between companies and, thereafter, an identification of best practices (bench-marking). The purpose of this paper is to present the best practices identified by performance indicators, related to the measurement of wastes and associated to construction companies participation in the benchmarking research process “Implementation of a system of performance indicators of cement-based construction technologies of the Community of Construction of Recife city in Brazil-PROGRIDE”, coordinated by the Brazilian Association of Portland Cement-ABCP. Therefore, it was sought to characterize best practices that led to the benchmarking of performance indicators related to the wastes of concrete, industrialized mortar for masonry settling and blocks/ bricks. As a contribution, a set of factors that characterize the best practices for each technology and conducted to benchmarking were identified.
Quantification of the Expression of HIF-1alpha by Real-Time PCR in Rat Hepatocytes Cultures Invaded by Shigella flexneri under Normoxic and Hypoxic Conditions  [PDF]
Camila Bárbara Cantalupo Lima, Sania Alves dos Santos, Dahir Ramos de Andrade Júnior
Advances in Microbiology (AiM) , 2015, DOI: 10.4236/aim.2015.57052
Abstract: Aim: Shigella flexneri (S. flexneri) is a gram-negative enterobacterium responsible for severe intestinal end systemic infection in humans. The bacteria can reach the liver due to degeneration of the colonic epithelium. Hypoxia is present in many human diseases and can induce the expression of the transcription factor HIF-1alpha that may have a cell protective role. The influence of hypoxia and HIF-1alpha on bacterial infection, studied in this work, is unclear. Hypoxia inducible factor-1alpha (HIF-1alpha) is a transcription factor that acts as a master regulator of gene expression induced by hypoxia. Methods: We compared the ability of S. flexneri to invade rat hepatocytes in primary culture both in normoxic and hypoxic conditions. We evaluated TNF-alpha released by hepatocytes, apoptosis rate and HIF-1alpha expression by confocal microscopy as well as real time PCR technique. Results: We showed that S. flexneri invaded less hepatocytes previously submitted to 24 h hypoxia (6.5% O2) than those cultivated in normoxia (21% O2). S. flexneri also induced HIF-1α expression in hepatocytes, TNF-α secretion and apoptosis. Conclusion: a) Hypoxia alone was not a stimulus to TNF-α secretion, but induced cell apoptosis and HIF-1α expression; b) S. flexneri was able to invade rat hepatocytes and hypoxia apparently influenced significantly bacterial cell invasiveness; c)
Brain SPECT in mesial temporal lobe epilepsy: comparison between visual analysis and SPM
Amorim, Bárbara Juarez;Ramos, Celso Darío;Santos, Allan Oliveira dos;Lima, Mariana da Cunha Lopes de;Min, Li Li;Camargo, Edwaldo Eduardo;Cendes, Fernando;Etchebehere, Elba Cristina Sá de Camargo;
Arquivos de Neuro-Psiquiatria , 2010, DOI: 10.1590/S0004-282X2010000200001
Abstract: objective: to compare the accuracy of spm and visual analysis of brain spect in patients with mesial temporal lobe epilepsy (mtle). method: interictal and ictal spects of 22 patients with mtle were performed. visual analysis were performed in interictal (visual(inter)) and ictal (visual(ictal/inter)) studies. spm analysis consisted of comparing interictal (spm(inter)) and ictal spects (spm(ictal)) of each patient to control group and by comparing perfusion of temporal lobes in ictal and interictal studies among themselves (spm(ictal/inter)). results: for detection of the epileptogenic focus, the sensitivities were as follows: visual(inter)=68%; visual(ictal/inter)=100%; spm(inter)=45%; spm(ictal)=64% and spm(ictal/inter)=77%. spm was able to detect more areas of hyperperfusion and hypoperfusion. conclusion: spm did not improve the sensitivity to detect epileptogenic focus. however, spm detected different regions of hypoperfusion and hyperperfusion and is therefore a helpful tool for better understand pathophysiology of seizures in mtle.
Functional electrical stimulation improves brain perfusion in cranial trauma patients
Amorim, Bárbara Juarez;Santos, Allan de Oliveira;Oberg, Telma Dagmar;Romanato, Juliana;Anjos, Dalton A.;Lima, Mariana da Cunha Lopes de;Ramos, Celso Darío;Honorato, Donizete Cesar;Camargo, Edwaldo Eduardo;Etchebehere, Elba Cristina de Sá Camargo;
Arquivos de Neuro-Psiquiatria , 2011, DOI: 10.1590/S0004-282X2011000500020
Abstract: objective: demonstrate brain perfusion changes due to neuronal activation after functional electrical stimulation (fes). method: it was studied 14 patients with hemiplegia who were submitted to a program with fes during fourteen weeks. brain perfusion spect was performed before and after fes therapy. these patients were further separated into 2 groups according to the hemiplegia cause: cranial trauma and major vascular insults. all spect images were analyzed using spm. results: there was a significant statistical difference between the two groups related to patient's ages and extent of hypoperfusion in the spect. patients with cranial trauma had a reduction in the hypoperfused area and patients with major vascular insult had an increase in the hypoperfused area after fes therapy. conclusion: fes therapy can result in brain perfusion improvement in patients with brain lesions due to cranial trauma but probably not in patients with major vascular insults with large infarct area.
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