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Search Results: 1 - 10 of 721231 matches for " Léa de Jesus; "
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Anatomia foliar de Alpinia zerumbet (Pers.) Burtt & Smith (Zingiberaceae)
Albuquerque, Elaine Santiago Brilhante de;Neves, Léa de Jesus;
Acta Botanica Brasilica , 2004, DOI: 10.1590/S0102-33062004000100010
Abstract: it was accomplished a study of the foliar anatomy of alpinia zerumbet (pers.) burtt & smith, zingiberaceae family collected at horto botanico of quinta da boa vista, s?o cristóv?o, rio de janeiro, rj. this species is vulgarly known as "col?nia" and is distinguished by its beautiful inflorescence and medicinal value. the main objective of this research is to contribute to the understanding of the morphological characteristics of this species as well its family taxonomy. anatomically, the leaf presents a dorsiventral organization of the mesophyll, disaccording with most monocotyledonous. another remarkable aspect is the presence of scattered oil cells throughout the mesophyll and abaxial surface of the leaf. the leaf is amphistomatic and presents hypodermis on both sides.
Scanning electron microscopy of the leaf epidermis of Merostachys Spreng. (Poaceae: Bambusoideae)
Gomes, Doria Maria Saiter;Neves, Léa de Jesus;
Acta Botanica Brasilica , 2009, DOI: 10.1590/S0102-33062009000200023
Abstract: this study presents data on leaf micromorphology of 13 species of merostachys spreng. (poaceae: bambusoideae), a neotropical genus with numerous endemic species. greatest species richness is found in central and southern brazil, with 41 of the 46 species described. species were collected in the field at the localities: itatiaia national park and tijuca national park, rio de janeiro state; fontes do ipiranga state park, s?o paulo state; santa teresa, espírito santo state and rio doce state park, minas gerais state. dried plant material came from the herbarium at the s?o paulo botany institute. the presence of prickles, silica bodies and macro hairs may be especially useful in delimiting species.
Identification of New Genes Related to Virulence of Xanthomonas axonopodis Pv. Citri during Citrus Host Interactions  [PDF]
Cristiano B. Ferreira, Leandro M. Moreira, Joice B. Brigati, Lonjoré L. Lima, Jesus A. Ferro, Maria I. T. Ferro, Julio C. F. de Oliveira
Advances in Microbiology (AiM) , 2017, DOI: 10.4236/aim.2017.71003
Abstract: A mutant library of the bacterium Xanthomonas citri subsp. citri strain 306 pathotype A (Xac), the causative agent of most aggressive Asiatic type A citrus canker, was screened regarding altered canker symptoms after inoculations into Citrus sinensis and Citrus limonia host leaves. Twenty-six mutants have shown phenotypic virulence changes and have respectively knocked out gene identified by sequencing. In vivo growth curves were obtained for nine mutants to quantify how the mutations could affect pathogen’s adaptability to growth inside and attack host plant infected tissue. Among identified genes in mutated strains, we could find those that until now had not been reported as being involved in Xac adaptation and/or virulence, such as predicted to encode for xylose repressor-like protein (XACΔxylR), Fe-S oxidoredutase (XACΔaslB), helicase IV (XACΔhelD), ubiquinol cytochrome c oxidoreductase iron-sulfur subunit (XACΔpetA), chromosome partitioning protein (XACΔparB) and cell division protein FtsB (XACΔftsB), in addition to genes predicted to encode for hypothetical proteins. The new genes found in this study as being relevant to adaptation and virulence, improve the understanding of Xac fitness during citrus plant attack and canker symptoms development.
Comparative study of Hepatitis C virus genotypes 1 and 3 in Salvador, Bahia
Codes L.,Freitas L.A.R. de,Santos- Jesus R.,Vitvitski L.
Brazilian Journal of Infectious Diseases , 2003,
Abstract: Hepatitis C virus displays a high degree of genetic mutation, with considerable heterogeneity, motivating clinical and biomolecular investigations. It is necessary to understand the effects of genotypes on the course of the disease, as well as their peculiarities at the regional level. OBJECTIVE: The study objective was to compare epidemiological, biochemical and histological aspects of hepatitis C virus genotypes 1 and 3 in Salvador, Bahia. STUDY DESIGN: Data were collected retrospectively from outpatient medical records. MATERIALS AND METHODS: 127 patients with positive anti-HCV results were selected, based on detectable RNA-HCV (RT-PCR) of genotypes 1a, 1b and 3a. RESULTS: Thirty-nine (30.7%) individuals were infected by subtype 1a, 45 (35.4%) by subtype 1b and 43 (33.9%) by subtype 3a. Most (73.2%) patients were male, with an average age of 47.8 years. The subtype 1b-infected patients had the highest average age (512 ±11.17; P=0.09). The use of illicit injected drugs was more frequent among subtype 3a infected individuals when compared with genotype 1 (6/43; 14% and 3/84; 3.6%, respectively; P=0,06). No significant differences were found for other epidemiological characteristics. Average values for GT, AST, ALT and ferritin did not differ between the groups (64, 78, 109, 276, respectively). Thyroid dysfunction occurred in 7/30 (23.3%) of those infected by genotype 3 (P=0.05). Cryoglobulinemia was also more frequent in this group (5/13, 38%, P=0.02). Most patients presented limited necro-inflammatory activity, stages 2 and 3 by the METAVIR Classification. In some cases, dissociation was noticed between inflammatory activity and fibrosis. No significant differences were found in the histopathological findings of the various genotypes. Younger patients had a significantly smaller degree of necrosis in stomatocytosis (P=0.032) and fibrosis (P=0.012). Intense parenchymatous activity and lymphoid follicles were more frequent among alcohol consumers (P=0.06 and P=0.04, respectively). CONCLUSIONS: In Bahia, genotype 3 dissemination seems to be associated with illicit drug use. The disease evolution depends on a function of complex interactions between virus and host. Age and alcohol consumption stand out as important variables in the development of cirrhosis.
Desenvolvimento de um detector piezelétrico para cromatógrafo a gás interfaceado a microcomputador
Jesus, Dosil P. de;Medeiros, Gilberto A. de;Lago, Claudimir L. do;
Química Nova , 1999, DOI: 10.1590/S0100-40421999000100020
Abstract: a piezoelectric detector based on a commercial quartz crystal of 3.57mhz is shown. a ptfe cell attached to the gc-column outlet holds the polymer-coated crystal, whose terminals were removed. two ttl oscillators (reference and sensor) are used and the beating of their frequencies is monitored through a home-made counter card inserted in a microcomputer. the original thermal conductivity detector was also interfaced, but through a 12-bit analog-to-digital converter. in spite of the well-known fact that qcm has low sensitivity at high temperatures, results show significant peak deformation for low temperatures. in addition, the phenomenon is also dependent on the chemical composition of the absorbent film besides instantaneous partial pressure and chemical composition of the analyte.
Desenvolvimento de um detector piezelétrico para cromatógrafo a gás interfaceado a microcomputador
Jesus Dosil P. de,Medeiros Gilberto A. de,Lago Claudimir L. do
Química Nova , 1999,
Abstract: A piezoelectric detector based on a commercial quartz crystal of 3.57MHz is shown. A PTFE cell attached to the GC-column outlet holds the polymer-coated crystal, whose terminals were removed. Two TTL oscillators (reference and sensor) are used and the beating of their frequencies is monitored through a home-made counter card inserted in a microcomputer. The original thermal conductivity detector was also interfaced, but through a 12-bit analog-to-digital converter. In spite of the well-known fact that QCM has low sensitivity at high temperatures, results show significant peak deformation for low temperatures. In addition, the phenomenon is also dependent on the chemical composition of the absorbent film besides instantaneous partial pressure and chemical composition of the analyte.
Estudo preliminar do potencial cariogênico de prepara??es doces da merenda escolar através do pH da saliva
Lázaro, Cristiane Pinheiro;Valen?a, Ana Maria Gondim;Chiappini, Claudete Corrêa de Jesus;
Revista de Nutri??o , 1999, DOI: 10.1590/S1415-52731999000300007
Abstract: the aim of this study was to establish the saliva ph curve in response to sweet foods, with different carbohydrate rates and different consistencies, frequently found in the school meal program in niterói, rio de janeiro. additionally, the study investigated the relationship between the carbohydrate content of the foods and the ph response. the subjects of the study were school-aged children seen in the dental clinic of faculty of dentistry of the universidade federal fluminense. for the tests, 52 children, eutrophic, healthy, with low and high risk of decay, who were not using any medication that could alter the flow and the composition of the saliva, were selected. in this group, 54% of the children were between 7 and 10 years old. the ph of the saliva was measured, with indicative ribbons, before and after the consumption of these preparations, in an interval of 10, 20, 40 and 60 minutes. the statistical analysis included qui-squared and student-t tests carried out with the epi info software. none of the curves of ph of the saliva, for all the tested preparations and risk groups, reached the critical ph values(5.3 -5.5). the curves of medium ph of the saliva for all the tested preparations oscillated in ph values more elevated for the group of low decay risk, and in lower values for the group of high decay risk. the low risk group curves of medium ph of the saliva demonstrated slower fall and later recovery, while in the high risk group the fall and the recovery of the ph were more immediate. in conclusion, the consistency of the preparations was preponderant in the carbohydrate content. the planning of the school meals should take into consideration the effect of the consistency of the sweet preparations served.
Improving the sensitivity of electrode-separated piezoelectric quartz crystal sensor for copper(II) ions by immobilization of the N-2-aminoethyl-3-aminopropylsilane group
Jesus, Dosil P. de;Neves, Carlos A.;Lago, Claudimir L. do;
Journal of the Brazilian Chemical Society , 2001, DOI: 10.1590/S0103-50532001000100017
Abstract: an electrode-separated piezoelectric quartz crystal sensor with a chemically modified surface was proposed. the modification was carried out by a silanization procedure with n-2-aminoethyl-3-aminopropyltrimethoxysilane, yielding the immobilised n-2-aminoethyl-3-aminopropylsilane group over the surface of a 3.5 mhz piezoelectric quartz crystal. a flow cell was manufactured with poly(methyl methacrylate) and brass, instead of noble metals, for the electrodes. in this cell, the solution touches only one side of the crystal and the related electrode is coated with a polyester film, which prevents corrosion and does not disturb the oscillation process. this innovation reduces the cost of the cell and renders an electronics non dccoupled to the solution. the modified crystal proved to be more sensitive to copper(ii) ions than magnesium(ii), nickel(ii), zinc(ii), and cobalt(ii). for 100ml sample injections, the limit of detection for copper(ii) was 6 mmol l-1, which is an impressive result when compared with that for an unmodified crystal.
A amiodarona e a tireóide
Pavan, Renata;Jesus, Alexandre M.X. de;Maciel, Léa M.Z.;
Arquivos Brasileiros de Endocrinologia & Metabologia , 2004, DOI: 10.1590/S0004-27302004000100020
Abstract: amiodarone is an iodine-rich drug widely used for the management of cardiac arrhythmias. during long-term amiodarone therapy drug toxicity may occur and a substantial proportion of amiodarone-treated patients develop either hypothyroidism or thyrotoxicosis. several mechanisms are involved in amiodarone-induced thyroid dysfunction: defective thyroid auto-regulatory mechanism in presence of excessive iodine offer, immunological factors and cytotoxicity. approximately 50% of patients taking amiodarone present abnormal thyroid function. therefore, for adequate clinical follow up of these patients, it is critical a careful monitoring of thyroid hormones and tsh, before and during treatment.
Classical and quantum mechanics of a charged particle in oscillating electric and magnetic fields
Jesus, V.L.B. de;Guimar?es, A.P.;Oliveira, I.S.;
Brazilian Journal of Physics , 1999, DOI: 10.1590/S0103-97331999000300019
Abstract: the motion of a particle with charge q and mass m in a magnetic field given by b = kb0 + b1 [icos(wt) + jsin(wt)] and an electric field which obeys ? ′e = -?b/?t is analysed classically and quantum-mechanically. the use of a rotating coordinate system allows the analytical derivation of the particle classical trajectory and its laboratory wavefunction. the motion exhibits two resonances, one at w = wc = -qbo/m, the cyclotron frequency, and the other at w = wl = -qbo/2m, the larmor frequency. for w at the first resonance frequency, the particle acquires a simple closed trajectory, and the effective hamiltonian can be interpreted as that of a particle in a static magnetic field. in the second case a term corresponding to an effective static electric field remains, and the particle orbit is an open line. the particle wave function and eigenenergies are calculated.
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