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Search Results: 1 - 10 of 12132 matches for " Stephania Katurtsch Mendes Melo "
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Diurnal Rhythm of Antioxidant Biomarkers in Equines  [PDF]
Erika Korinfsky Wanderley, Hélio Cordeiro Manso-Filho, Helena Emília Costa Cordeiro Manso, Stephania Katurtsch Mendes Melo, José Mário Gir?o Abreu, Juliana Andressa D’Araújo
Open Journal of Veterinary Medicine (OJVM) , 2013, DOI: 10.4236/ojvm.2013.31009
Abstract:

The aim of the present study was to test the hypothesis that glutathione peroxidase, uric acid, and a number of hematological biomarkers do not vary in adult mares, over a 24-hour period. Seven adult (age 10 ± 6 yrs; weight 370 ± 30 kg) Arabian Purebred mares were used. Blood samples were collected every two hours, except during the period after-meals, when samples were collected every 30 minutes, totaling four samples in two hours. These samples were used to analyze glutathione peroxidase (GPx), uric acid (UA), glucose (GLU), total plasma protein (TPP), red blood cells (RBC), hemoglobin (HB), hematocrit (HT), red cell distribution width (RDW), white blood cells (WBC) and lymphocytes (LYM). One-way repeated measures analysis of variance (ANOVA) was used to determine significant differences. Tukey’s test was used for multiple comparisons between the averages. Ρ values < 0.05 were considered statistically significant. Antioxidant biomarkers GPx and UA, as well as hematological biomarkers TPP, RBC, HB and HT exhibited a diurnal rhythm that was not affected by food ingestion, while RDW-SD, RDW-CV, WBC and LYM did not present a statistically significant change in the same period.

Pattern of Development in Foals from Four Different Breeds between Birth and Weaning  [PDF]
Hélio Cordeiro Manso Filho, M?nica Miranda Hunka, Erika Korinfsky Wanderley, Stephania Katurchi Mendes Mélo, Maria do Rosário Beltr?o, José Mário Gir?o Abreu, Helena Emília Costa Cordeiro Manso
Open Journal of Veterinary Medicine (OJVM) , 2014, DOI: 10.4236/ojvm.2014.45009
Abstract: Several studies have shown a major development in height and cannon bone circumference in foals from birth to weaning and from different breeds. However, in Brazil, there is little information about foal development. For this reason, this study has used data on foals from seven different farms in Pernambuco, Northeast Brazil, where horses have a major economic importance. The aim of this study was to compare foal’s development from four breeds and to develop a regression formula in order to estimate such development. It was used data from 210 suckling foals (Arabians n = 18, Campolina n = 86, Mangalarga Marchador n = 42 and Quarter Horses n = 64), raised in similar management practices. Their height at withers, heart girth, and cannon bone girth were measured monthly from birth to weaning. Data we reanalyzed by ANOVA and Tukey Test, with P established in 5%. The highest mean of height at withers was observed in the Arabian foals, and it was similar to Campolina and Mangalarga Marchador foals. The last breed presented a higher percentage of gain in height (~36%) and higher heart girth. On the other hand, Campolina foals had the highest mean of cannon bone girth. There was a significant interaction between breed and development phase in heart and cannon bone girths. All regression for mulas obtained from this data was very significant, and it was showed that they can predict height at withers in the four breeds studied. Heart and cannon bone girths showed medium value of R2 and large significance. It is important to highlight that fetal programing produces significant impact on foal development, even after weaning. So, this study would have observed some more changes if its scope had been extended beyond this phase.
Blood and Milk Glutamine + Glutamate and Milk Composition in Lactating Holstein Cows in Semi-Arid of Brazil  [PDF]
Joyci Torres d’Paula, Rafael Leonardo Vargas Martinez, Telga Lucena de Almeida Craveiro Alves, Stephania Katurchi Mendes Mélo, Marianne Kutschenko, Eduardo Terra Nogueira, Helena Emília Cavalcanti da Costa Cordeiro Manso, Hélio Cordeiro Manso Filho
Open Journal of Veterinary Medicine (OJVM) , 2014, DOI: 10.4236/ojvm.2014.412039
Abstract: Our objectives were to measure glutamine (Gln) and glutamate (Glu) concentrations in the milk and blood of lactating Holstein cows, as well as milk composition and somatic cell count (SCC) throughout different stages of lactation. Samples were collected from 21 cows in the 1st, 2nd, 3rd, 5th and 10th months of lactation. It analyzed Gln and Glu in the blood and Gln, Glu, lactose, fat, protein and somatic cells in the milk. Also, it measured Gln and Glu in blood from these dairy cows’ calves. Results were analyzed using one-way ANOVA, T-test and Tukey’s test, with a 5% significance level. There was a difference in blood [Gln] in from dairy cows (P < 0.05), with lost concentration observed at 2nd (~0.181 μmol/mL) and 5th (~0.190 μmol/mL) months of lactation and the highest at 10th month (~0.276 μmol/mL). Also there was a higher protein content in the 5th and 10th months of lactation (~3.61% each) when compared to the other months (P < 0.05). There was no difference in calves’ parameters and in all others parameters from dairy cows. We concluded that the lactation period produced a significant interference in blood [Gln] but not in milk [Gln] which may indicate increase in utilization or decrease in production of this amino acids during lactation in these cows under tropical conditions.
Computing Conditional VaR using Time-varying CopulasComputing Conditional VaR using Time-varying Copulas
Beatriz Vaz de Melo Mendes
Revista Brasileira de Finan?as , 2005,
Abstract: It is now widespread the use of Value-at-Risk (VaR) as a canonical measure at risk. Most accurate VaR measures make use of some volatility model such as GARCH-type models. However, the pattern of volatility dynamic of a portfolio follows from the (univariate) behavior of the risk assets, as well as from the type and strength of the associations among them. Moreover, the dependence structure among the components may change conditionally t past observations. Some papers have attempted to model this characteristic by assuming a multivariate GARCH model, or by considering the conditional correlation coefficient, or by incorporating some possibility for switches in regimes. In this paper we address this problem using time-varying copulas. Our modeling strategy allows for the margins to follow some FIGARCH type model while the copula dependence structure changes over time.
Local Estimation of Copula Based Value-at-Risk
Eduardo F. L. de Melo,Beatriz Vaz de Melo Mendes
Revista Brasileira de Finan?as , 2009,
Abstract: In this paper we propose the local maximum likelihood method for dynamically estimate copula parameters. We study the estimates statistical properties and derive the expression for their asymptotic variance in the case of Gaussian copulas. The local estimates are able to detect temporal changes in the strength of dependence among assets. These dynamics are combined with a GARCH type modeling of each individual asset to estimate the Value- at-Risk. The performance of the proposed estimates is investigated through Monte Carlo simulation experiments. In an application using real data, an out-of-sample test indicated that the new methodology may outperform the constant copula model when it comes to Value-at-Risk estimation.
Habilidades auditivas e linguísticas iniciais em crian?as usuárias de implante coclear: relato de caso
Melo, Tatiana Mendes de;Lara, Jessica Domingues;
Jornal da Sociedade Brasileira de Fonoaudiologia , 2012, DOI: 10.1590/S2179-64912012000400017
Abstract: the cochlear implant (ci) represents the most important advance in the treatment of individuals with severe to profound bilateral hearing loss who do not benefit from hearing aids. children who receive the ci during the critical period of neuroplasticity of the auditory system, when combined with speech therapy, have the chance to develop the auditory and linguistic skills similarly to their normal hearing peers. two cases of implanted children are presented in this study, and one of them was not enrolled in a formal aurioral therapeutic program since the implantation surgery. at the moment of language and auditory assessment, the children were 2 years and 5 months old, and the ci had been used for 11 months. according to the results presented, it was observed that the child enrolled in rehabilitation program had better auditory and language performance when compared to the other child. despite the remarkable benefits that the ci provides to children with hearing impairment, the device itself only provides the child with the audibility of environmental sounds and speech signal. for the auditory and language development to happen, it is necessary, among other factors, a speech-language intervention, with partnership between professionals and parents.
Prenatal Diagnosis of a Congenital Postaxial Longitudinal Limb Defect: A Case Report
Joana Pauleta,Maria Antonieta Melo,Luís Mendes Gra?a
Obstetrics and Gynecology International , 2010, DOI: 10.1155/2010/825639
Abstract: Introduction. Although congenital longitudinal fibular deficiency is one of the most common long bone deficiencies, there are few published cases of its prenatal diagnosis. Case report. A right longitudinal deficiency of the fibula associated with tibial shortening, foot equinovalgus, and absence of the fourth and fifth foot rays diagnosed at 22 weeks gestation is described. Sequential ultrasonographic surveillance was performed without obstetric complications. The anomaly was confirmed after birth, and conservative orthopaedic management was decided. Conclusion. Though rarely seen, postaxial longitudinal limb defect may be detected by ultrasound. The correct approach can only be decided after birth, when the functional impact of the anomaly can be fully evaluated. 1. Introduction Postaxial longitudinal defect is one of the most common congenital limb reduction defects. This entity includes a large spectrum of abnormalities that may range from severe hypoplasia to complete absence of the fibula and the 5th rays. It is a rare disorder, with an estimated prevalence of 5.7 to 20 cases per 1 million births [1]. Up to now, only few cases of prenatal diagnosis of isolated longitudinal deficiency of the fibula were reported [1–4]. 2. Case Report A 38-year-old healthy primigravida, with no familiar history of limb defects or exposure to teratogenic drugs, was referred to our ultrasound unit at 22 weeks gestation after the absence of the right fibula was diagnosed during the second trimester ultrasound examination. This diagnosis was confirmed in our department. Further assessment of the ipsilateral lower limb detected a discrete femur shortening (35?mm versus 37?mm of left femur, discrepancy of 5.4%), anteromedial bowing and tibial shortening (27.2?mm versus 33.6?mm of left tibia, discrepancy of 19%), see Figure 1, foot equinovalgus, and absence of the fourth and fifth foot rays and digits. All other long bones (humeri, ulnae, and radii) were symmetric and appropriated in length and configuration for gestational age, as were the hands. No other anomalies were detected, namely, craniosynostosis, omphalocele, renal displasia, neural tube defects, thoracoabdominal schisis, or facial dysmorphies. Amniocentesis revealed a normal female karyotype (46, XX). Fetal echocardiography was normal. Follow-up ultrasound examinations were carried out periodically until birth (Figure 2). Tibial discrepancy increased slightly with a difference of 13?mm (23.6%) at 34 weeks gestation. Figure 1: Ultrasound images showing absence of right fibula, bowing of right tibia (a), and
Estudo colorimétrico da montmorilonita I : obten??o da reta padr?o e estudo da influência do quartzo e da caolinita na absorbancia do sistema colorido
Mendes, A.C. Teixeira;Melo, Wanderley José de;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1970, DOI: 10.1590/S0071-12761970000100005
Abstract: the objective of this work is to establish a colorimetric method for the quantitative determination of montmorillonite. it is based on reaction of this clay mineral with benzidine, because the colouring complex follows the law of lambert beer in the interval from 7,35 to 36,75 ug of montmorillonite/ ml. various concentrations of this mineral were treated with 1,0 ml of an aqueous solution of benzidine, and the absorbance of the complex was readen after 48 hours with a filter number 60 in a "klett-summerson" colorimeter. with these data it was made an equacion reporting the concentration against the absorbance, what is: x - 5l - 14,7 (l is absorbance and x is ug of montmorillonite). it was also tested the influence of other minerals as quartz and kaollinite. the conclusion was that they increase the absorbance. in this test two new equacions were obtained: x = 4,17l - 30,04 for the misture of montmorillonite, quartz and kaollinite and x = 4,76l - 60,33 for the misture of montmorillonite and quartz. in the misture where the three minerals are present the increases are higher than when only quartz was present.
Soroprevalência da infec??o pelo vírus da artrite-encefalite caprina (caev) no rebanho de caprinos leiteiros da regi?o da Grande Fortaleza, Ceará, Brasil
Melo, Ana Célia Mendes;Franke, Carlos Roberto;
Ciência Rural , 1997, DOI: 10.1590/S0103-84781997000100019
Abstract: a serologic survey was performed using a agar gel immunodiffusion test (agid) with the maedi/visna virus antigen (p28) to estimate the seroprevalence of the caprine arthritisencephalitis virus infection (caev) in a dairy goat population in the region of "grande fortaleza", in the state of ceará, brazil. in this study a total of eight flocks were examined, five included intensive and three semi-intensive managements. the population studied consisted of three groups: pure-bred animais of exotic races such as saanen, alpine parda, anglonubian and toggenburg: crossbreeds and animais of undefined breed. serum samples were colleted from 248 goats, clinicai analysis were performed, andan epidemiologic survey was applied. analysis of the results showed a seroprevalence of 40.73% (101/248). all seropositive samples carne from the flocks with intensive management (5/8). the distribution of seroprevalence in each of these flocks was 61% (54/89). 74.28% (26/35), 61.11% (11/18), 11.36% (5/44) and 75% (6/8). a significam difference (p<0.05) was observed on the seroprevalence among the pure-breeds, crossbreeds and animais of undefined breed, of66%(80/l22), 31% (19/61) and 3% (2/65), respectively. no significam differences (p>0.05) were observed related to age and sex of the studied animais.
Sobre a precis?o das estimativas de máxima verossimilhan?a nas distribui??es bivariadas de valores extremos
Moretti, Alba Regina;Mendes, Beatriz Vaz de Melo;
Pesquisa Operacional , 2003, DOI: 10.1590/S0101-74382003000200004
Abstract: the non-degenerated limit distributions of normalized maxima are the so called bivariate extreme value distributions. when modeling the asymptotic probabilistic behavior of extremes the objective is to obtain good approximations for the bivariate extremes distributions allowing the investigation of simultaneous extreme events. typically the sample sizes are small, and this raises questions related to the quality and accuracy of the maximum likelihood estimates of the parameters and other quantities derived from the models. in this article we use bootstrap resampling schemes and monte carlo simulations to assess the variability and to construct confidence intervals for these estimates, in order to establish how reliable are the conclusions drawn from the analyzes based on these models. critical values for the tests proposed in tawn (1988) are obtained through simulations.
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