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Search Results: 1 - 10 of 248097 matches for " Juan C.;Bizari "
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Contribui??o da estrutura interna na perda de carga de filtros de areia utilizados na irriga??o
Mesquita, Marcio;Testezlaf, Roberto;Salcedo, Juan C.;Bizari, Douglas R.;
Engenharia Agrícola , 2012, DOI: 10.1590/S0100-69162012000100013
Abstract: the dynamic of operation of sand filters affect the hydraulic performance of irrigation systems, increasing the head loss and changing the total dynamic head of the system. trying to understand part of this dynamic, the objective of this research was to determine the effect of internal hydraulic structures in the head loss of three sand filters of commercial models, manufactured in brazil and operating without the filter layer and with clean water. in addition, using an exponential mathematical model adjusted to the experimental data, comparisons among types of structure of each evaluated filter were performed. the trails were accomplished in the experimental module developed in the laboratory of hydraulics and irrigation of feagri / unicamp. the results showed that the filters structures determined differentiate hydraulic behaviors and each type of structures (diffuser plate and drains) change the standard operation for the evaluated filters. the mathematical function proposed represented significantly the head loss physical phenomenon for the experimental conditions.
Cognitive dysfunction in children with sleep disorders
Carvalho, Luciane Bizari Coin de;Prado, Lucila Bizari Fernandes do;Silva, Luciana;Almeida, Marilaine Medeiros de;Silva, Tatiana Almeida e;Vieira, Célia Maria Alcantara Machado;Atallah, álvaro Nagib;Prado, Gilmar Fernandes do;
Arquivos de Neuro-Psiquiatria , 2004, DOI: 10.1590/S0004-282X2004000200004
Abstract: sleep is basic for physical and cognitive development and some studies have suggested that there may be an association between sleep disorders (sd) and cognitive dysfunction (cd) in children. little is known, however, about sd and cognition in 7-10-year-old children, a fact that motivated the present study. method: we applied an sd questionnaire in 1180 children, 547 with sd and 633 without sd (cg), to assess cognition with a screening test (bender visual motor gestalt test - bt). results: we observed a similar frequency of cd in the children with sd (39%) and that ot the cg (40%). the 8-year-old children with sd presented a lower prevalence of cd than the cg (sd=6%, n=6; cg=13%, n=16; p=0.04). conclusion: the frequency of children with cd was equal in the study and control groups when considering the total sample (7- to 10-year-old children). in contrast to our expectations, the sd group of 8-year-old children presented a lower frequency of cd than the control group.
Study of University Dropout Reason Based on Survival Model  [PDF]
Juan C. Juajibioy
Open Journal of Statistics (OJS) , 2016, DOI: 10.4236/ojs.2016.65075
Abstract: In this paper, we introduce the survival modelling methodology in order to identify some factors which may be influencing the university dropout. By using the data base provided by the Fundación Universidad Autónoma de Colombia and the semi parametric proportional hazard Cox model, we have been able to identify these risk factors.
Oropharyngeal examination as a predictor of obstructive sleep apnea: pilot study of gag reflex and palatal reflex
Valbuza, Juliana Spelta;Oliveira, Márcio Moysés de;Conti, Cristiane Fiquene;Prado, Lucila Bizari F.;Carvalho, Luciane B.C.;Prado, Gilmar Fernandes do;
Arquivos de Neuro-Psiquiatria , 2011, DOI: 10.1590/S0004-282X2011000600015
Abstract: obstructive sleep apnea (osa) has high prevalence and may cause serious comorbities. the aim of this trial was to show if simple noninvasive methods such as gag reflex and palatal reflex are prospective multivariate assessments of predictor variables for osa. method: we evaluate gag reflex and palatal reflex, of fifty-five adult patients, and their subsequent overnight polysomnography. results: forty-one participants presented obstructive sleep apnea. the most relevant findings in our study were: [1] absence of gag reflex on patients with severe obstructive apnea (p=0.001); [2] absence of palatal reflex on moderate obstructive apnea patients (p=0.02). conclusion: gag reflex and palatal reflex, a simple noninvasive test regularly performed in a systematic neurological examination can disclose the impact of the local neurogenic injury associated to snoring and/or obstructive sleep apnea syndrome.
Quality of life of patients with obstructive sleep apnea syndrome treated with an intraoral mandibular repositioner
Machado Marco Antonio Cardoso,Prado Lucila Bizari Fernandes do,Carvalho Luciane Bizari Coin de,Francisco Silvio
Arquivos de Neuro-Psiquiatria , 2004,
Abstract: BACKGROUND: Obstructive sleep apnea syndrome (OSAS) is a very important and prevalent disease, which is associated with a poor quality of life in many patients. Treatments for OSAS include surgery, Continuos Positive Air way Pressure, and an intraoral mandibular repositioner (IOMR), but the tendency of sleep centers is to emphasize the apnea index, neglecting quality of life as treatment outcome. OBJECTIVE: To verify to what extent treatment with an IOMR improves the OSAS patient's quality of life. METHOD: Eleven male patients aged 34 to 63 years (mean=49) with mild to moderate OSAS were evaluated using the Calgary SAQLI questionnaire applied before and four weeks after treatment with an IOMR. The mandibular repositioners were manufactured individually for each patient with acrylic polymer and equipped with a retentive device to maintain the mandible in a forward position during sleep. RESULTS: Excellent improvement in the quality of life was observed in five patients (45.5%) and excellent improvement in symptoms in 10 (90.9%). CONCLUSION: The systematic use of the IOMR indicates a clear improvement in the global quality of life as well as in the symptoms of patients with OSAS.
Cognitive dysfunction in children with sleep disorders
Carvalho Luciane Bizari Coin de,Prado Lucila Bizari Fernandes do,Silva Luciana,Almeida Marilaine Medeiros de
Arquivos de Neuro-Psiquiatria , 2004,
Abstract: Sleep is basic for physical and cognitive development and some studies have suggested that there may be an association between sleep disorders (SD) and cognitive dysfunction (CD) in children. Little is known, however, about SD and cognition in 7-10-year-old children, a fact that motivated the present study. METHOD: We applied an SD questionnaire in 1180 children, 547 with SD and 633 without SD (CG), to assess cognition with a screening test (Bender Visual Motor Gestalt Test - BT). RESULTS: We observed a similar frequency of CD in the children with SD (39%) and that ot the CG (40%). The 8-year-old children with SD presented a lower prevalence of CD than the CG (SD=6%, n=6; CG=13%, n=16; p=0.04). CONCLUSION: The frequency of children with CD was equal in the study and control groups when considering the total sample (7- to 10-year-old children). In contrast to our expectations, the SD group of 8-year-old children presented a lower frequency of CD than the control group.
Laser in medicine Láser en medicina
Juan C. Cárdenas
Iatreia , 1993,
Abstract: The fundamentals of laser functioning and a brief historic description on the subject are presented; laser Is classified according to emission potency, materials with which it is built and pulsation. Different mechanisms of action of laser as well as Its indications and contraindications are discussed. Emphasis is given to low-power laser. Local and foreign experiences with Its medlcal use are briefly described Se revisan los principios fundamentales del funcionamiento del láser, se hace una breve revisión histórica del mismo y se lo clasifica de acuerdo con la potencia de emisión, los materiales de fabricación y la pulsación. Se enumeran los diferentes mecanismos de acción del láser y sus indicaciones y contraindicaciones haciendo énfasis en lo concerniente al láser de baja potencia, tanto pulsado como no pulsado; se alude a las experiencias nacionales y de otros países.
Future Changes in Drought Characteristics over Southern South America Projected by a CMIP5 Multi-Model Ensemble  [PDF]
Olga C. Penalba, Juan A. Rivera
American Journal of Climate Change (AJCC) , 2013, DOI: 10.4236/ajcc.2013.23017

The impact of climate change on drought main characteristics was assessed over Southern South America. This was done through the precipitation outputs from a multi-model ensemble of 15 climate models of the Coupled Model Intercomparison Project Phase 5 (CMIP5). The Standardized Precipitation Index was used as a drought indicator, given its temporal flexibility and simplicity. Changes in drought characteristics were identified by the difference for early (2011-2040) and late (2071-2100) 21st century values with respect to the 1979-2008 baseline. In order to evaluate the multi-model outputs, model biases were identified through a comparison with the drought characteristics from the Global Precipitation Climatology Centre database for the baseline period. Future climate projections under moderate and high-emission scenarios showed that the occurrence of short-term and long-term droughts will be more frequent in the 21st century, with shorter durations and greater severities over much of the study area. These changes in drought characteristics are independent on the scenario considered, since no significant differences were observed on drought changes. The future changes scenario might be even more dramatic, taking into account that in most of the region the multi-model ensemble tends to produce less number of droughts, with higher duration and lower severity. Therefore, drought contingency plans should take these results into account in order to alleviate future water shortages that can have significant economic losses in the agricultural and water resources sectors of Southern South America.

Peripheral position of CCND1 and HER-2/neu oncogenes within chromosome territories in esophageal and gastric cancers non-related to amplification and overexpression
Bizari, Lucimari;Tajara, Eloiza Helena;Silva, Ana Elizabete;
Genetics and Molecular Biology , 2009, DOI: 10.1590/S1415-47572009005000034
Abstract: interphase chromosomes have been shown to occupy discrete regions of the nucleus denominated chromosome territories (cts), their active genes being preferentially positioned on the surfaces of these cts, where they are accessible to transcriptional machinery. by means of fish (fluorescence in situ hybridization), we analyzed the ccnd1 and her-2/neu gene positions within the cts and their relationship with gene amplification and protein over-expression in esophageal and gastric cancers. the ccnd1 and her-2/neu genes were more often positioned at the periphery (mean frequency of 60%-83%) of the cts in tumor tissues of the esophagus and stomach. moreover, this positioning revealed no association with either gene amplification or the protein over-expression status of these genes, although, in esophageal carcinoma, kappa statistics showed a moderate agreement between amplification of the ccnd1 gene (kappa = 0.400) and its location within the ct, as well as with over-expression of the corresponding protein (kappa = 0.444). thus, our results suggest that gene positioning in interphase chromosomes does not follow a definitive pattern neither does it depend only on gene transcriptional activity. apparently, this positioning could be both gene- and tissue-specific, and depends on other factors acting together, such as dense-gene, chromosome size, chromatin structure, and the level and stability of its expression.
Gene amplification in carcinogenesis
Bizari, Lucimari;Silva, Ana Elizabete;Tajara, Eloiza H.;
Genetics and Molecular Biology , 2006, DOI: 10.1590/S1415-47572006000100001
Abstract: gene amplification increases the number of genes in a genome and can give rise to karyotype abnormalities called double minutes (dm) and homogeneously staining regions (hsr), both of which have been widely observed in human tumors but are also known to play a major role during embryonic development due to the fact that they are responsible for the programmed increase of gene expression. the etiology of gene amplification during carcinogenesis is not yet completely understood but can be considered a result of genetic instability. gene amplification leads to an increase in protein expression and provides a selective advantage during cell growth. oncogenes such as ccnd1, c-met, c-myc, erbb2, egfr and mdm2 are amplified in human tumors and can be associated with increased expression of their respective proteins or not. in general, gene amplification is associated with more aggressive tumors, metastases, resistance to chemotherapy and a decrease in the period during which the patient stays free of the disease. this review discusses the major role of gene amplification in the progression of carcinomas, formation of genetic markers and as possible therapeutic targets for the development of drugs for the treatment of some types of tumors.
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