Produção Nacional
Revisado por pares
Alex de Oliveira, Marco Aurélio Barbosa de Lima, Luíza Helena de Oliveira Pires, Moisés Rosas da Silva, Patrícia Teresa Souza da Luz, Rômulo Simões Angélica, Geraldo Narciso da Rocha Filho, Carlos Emmerson Ferreira da Costa, Rafael Luque, Luís Adriano Santos do Nascimento,
Two bentonites from Paraíba (Northeastern Brazil) were impregnated with heteropoly phosphomolybdic H3PMo12O40 (HPMo). The materials produced were characterized by various techniques such as N2 adsorption-desorption (specific surface area, SSA), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Thermogravimetric analysis (TGA/DTG), Scanning Electron Microscopy (SEM) equipped with Dispersive Energy X-ray spectroscopy (EDS), ultraviolet-visible spectroscopy (UV-vis), acid-base titration ...
Tópico(s): Catalysis and Hydrodesulfurization Studies
2019 - Multidisciplinary Digital Publishing Institute | Materials
Produção Nacional
Revisado por pares
Marco Aurélio Barbosa Alves, Adilson Pacheco de Souza, Frederico Terra de Almeida, Aaron Kinyu Hoshide, Handrey Borges Araújo, Apoliano Francisco da Silva, Daniel Fonseca de Carvalho,
Agricultural soils provide ecosystem services, but the removal of natural vegetation reduces water infiltration capacity, increasing surface runoff. Thus, monitoring erosion is critical for sustainable agricultural management. Sediment losses and surface runoff were evaluated using a simulated rainfall of 75 mm/h in areas with crops and pastures in both the Caiabi River and Renato River sub-basins of the Teles Pires River watershed in Mato Grosso State, Brazil. In both the Caiabi and Renato sub- ...
Tópico(s): Aeolian processes and effects
2023 - Multidisciplinary Digital Publishing Institute | Sustainability
Produção Nacional
Revisado por pares
Werner Treptow, Marco Aurélio A. Barbosa, Leandro G. Garcia, Antônio F. Pereira de Araújo,
Abstract By Monte Carlo simulations, we explored the effect of single mutations on the thermodynamics and kinetics of the folding of a two‐dimensional, energetically frustrated, hydrophobic protein model. Φ‐Value analysis, corroborated by simulations beginning from given sets of judiciously chosen initial contacts, suggests that the transition state of the model consists of a limited region of the native structure, that is, a folding nucleus. It seems that the most important contacts in the transition ...
Tópico(s): Lipid Membrane Structure and Behavior
2002 - Wiley | Proteins Structure Function and Bioinformatics
Produção Nacional
Marco Aurélio A. Barbosa, Vera B. Henriques,
We have reconsidered the Bell-Lavis model of liquid water and investigated its relation to its isotropic version, the antiferromagnetic Blume-Emery-Griffiths model on the triangular lattice. Our study was carried out by means of an exact solution on the sequential Husimi cactus. We show that the ground states of both models share the same topology and that fluid phases (gas and low- and high-density liquids) can be mapped onto magnetic phases (paramagnetic, antiferromagnetic, and dense paramagnetic, ...
Tópico(s): Complex Systems and Time Series Analysis
2008 - American Physical Society | Physical Review E
Produção Nacional
Revisado por pares
A.R. Brandão, Herbert de Sousa Barbosa, Marco Aurélio Zezzi Arruda,
Considering the importance of bidimensional electrophoresis and image analysis in comparative proteomics, the parameters that influence the analysis of protein expression of transgenic and non-transgenic soybean seeds were evaluated. The loaded mass of the proteins (150-500 microg), the pH separation range (3-10 or 4-7), and manual/automatic image editing were evaluated. Additionally, after optimizing the conditions, histograms and matchings were obtained in order to accurately analyze the variations ( ...
Tópico(s): Transgenic Plants and Applications
2010 - Elsevier BV | Journal of Proteomics
Produção Nacional
Tiago J. Oliveira, Jürgen F. Stilck, Marco Aurélio A. Barbosa,
We study a model of a lattice gas with orientational degrees of freedom which resemble the formation of hydrogen bonds between the molecules. In this model, which is the simplified version of the Henriques-Barbosa model, no distinction is made between donors and acceptors in the bonding arms. We solve the model in the grand-canonical ensemble on a Husimi lattice built with hexagonal plaquettes with a central site. The ground-state of the model, which was originally defined on the triangular lattice, ...
Tópico(s): Glass properties and applications
2010 - American Physical Society | Physical Review E
Produção Nacional
Revisado por pares
Hamilton Seron Pereira, Newton Cabral Barbosa, Marco Aurélio Carbone Carneiro, Gaspar Henrique Korndörfer,
O objetivo deste trabalho foi avaliar extratores e fontes de silício (Si) na cultura do arroz em Neossolo Quartzarênico em casa de vegetação. O delineamento experimental foi feito em esquema fatorial (26x7) inteiramente casualizado com 25 fontes de silício, aplicadas à dose de 250 kg ha-1 de Si e a testemunha, e 7 extratores de Si no solo. Tratamentos adicionais com 125, 375 e 500 kg ha-1 de Si foram aplicados com wollastonita. Depois de 90 dias do plantio, foi avaliada a produção de matéria seca ...
Tópico(s): Geochemistry and Elemental Analysis
2007 - Embrapa Informação Tecnológica | Pesquisa Agropecuária Brasileira
Produção Nacional
Revisado por pares
Flávio Juliano Pimenta, Dawidson Assis Gomes, Paôlla Freitas Perdigão, Alvimar Afonso Barbosa, Marco Aurélio Romano‐Silva, Marcus V. Gomez, C. Marcelo Aldaz, Luiz Marco, Ricardo Santiago Gomez,
Oral squamous cell carcinoma (OSCC) is the most common malignant neoplasm of the oral cavity, representing 90% of all oral carcinomas and accounting for 3-5% of all malignancies. The WWOX gene (WW-domain containing oxidoreductase) is a candidate tumor suppressor gene located at 16q23.3-24.1, spanning the second most common fragile site, FRA16D. In this report, the role of the WWOX gene was investigated in 20 tumors and 10 normal oral mucosas, and we demonstrated an altered WWOX gene in 50% (10/20) ...
Tópico(s): Peptidase Inhibition and Analysis
2005 - Wiley | International Journal of Cancer
Produção Nacional
Revisado por pares
André Vargas Abs da Cruz, Carlos Roberto Hall Barbosa, Marco Aurélio C. Pacheco, Marley Vellasco,
This work proposes a new kind of evolutionary algorithm inspired in the principles of quantum computing. This algorithm is an extension of a proposed model for combinatorial optimization problems which uses a binary representation for the chromosome. This extension uses probability distributions for each free variable of the problem, in order to simulate the superposition of solutions, which is intrinsic in the quantum computing methodology. A set of mathematical operations is used as implicit genetic ...
Tópico(s): Metaheuristic Optimization Algorithms Research
2004 - Springer Science+Business Media | Lecture notes in computer science
Produção Nacional
Revisado por pares
C. Pozzi, Camila Pereira Braga, José Cavalcante Souza Vieira, Bruna Cavecci, João Vitor de Queiroz, Herbert de Sousa Barbosa, Marco Aurélio Zezzi Arruda, Fábio C. Gozzo, Pedro de Magalhães Padilha,
Tópico(s): Advanced biosensing and bioanalysis techniques
2014 - Elsevier BV | Food Chemistry
Produção Nacional
Marco Aurélio A. Barbosa, Evy Salcedo, Márcia C. Barbosa,
The relation between liquid-liquid phase transitions and waterlike density anomalies in core-softened potentials of fluids was investigated in an exactly solvable one dimensional lattice model and a in a three dimensional fluid with fermi-like potential, the latter by molecular dynamics. Both systems were shown to present three liquid phases, two liquid-liquid phase transitions closely connected to two distinct regions of anomalous density increase. We propose that an oscillatory behavior observed ...
Tópico(s): Quantum, superfluid, helium dynamics
2013 - American Physical Society | Physical Review E
Produção Nacional
Revisado por pares
Aline Lisbôa Medina, Marcelo Ancelmo Oseas da Silva, Herbert de Sousa Barbosa, Marco Aurélio Zezzi Arruda, Antonio Marsaioli, Neura Bragagnolo,
A new method for microwave assisted extraction (MAE) of meat lipids using a non-halogenated solvent and at low temperature was developed. The effect of microwave irradiation on lipid oxidation during extraction was verified by conjugated dienes, peroxide index, volatile compound (hexanal, pentanal and propanal) and fatty acid analyses. The method showed to be precise and accurate at comparison with Folch extraction and by validation with standard reference material. No changes occurred in the fatty ...
Tópico(s): Identification and Quantification in Food
2015 - Elsevier BV | Food Research International
Produção Nacional
Revisado por pares
Manoel Damião Sousa‐Neto, Yara Teresinha Corrêa Silva‐Sousa, Jardel Francisco Mazzi‐Chaves, Kleber Kildare Teodoro de Carvalho, Ana Flávia Simões Barbosa, Marco Aurélio Versiani, Reinhilde Jacobs, Graziela Bianchi Leoni,
This literature review has critically analyzed the published research related to the biomechanical preparation of root canals with three-dimensional analysis using micro-computed tomography (micro-CT). In December 2017, six databases (PubMed, Cochrane, Web of Science, Embase, Scopus, and Science Direct) were accessed using keywords to find articles including the use of the micro-CT analysis in biomechanical root canal preparation. There were 60 full articles that were selected, which were screened ...
Tópico(s): Occupational health in dentistry
2018 - Brazilian Society of Dental Research | Brazilian Oral Research
Produção Nacional
Revisado por pares
Márcio S. Gomes-Filho, Marco Aurélio A. Barbosa, Fernando A. Oliveira,
A lattice gas model is proposed for investigating the release of drug molecules on devices with semi-permeable, porous membranes in two and three dimensions. The kinetic of this model was obtained through the analytical solution of the three-dimension diffusion equation for systems without membrane and with Monte Carlo simulations. Pharmaceutical data from drug release is usually adjusted to the Weibull function, $\exp [-(t/τ)^b ]$, also known as stretched exponential, and the dependence of adjusted parameters $ ...
Tópico(s): Rheology and Fluid Dynamics Studies
2019 - Elsevier BV | Physica A Statistical Mechanics and its Applications
Produção Nacional
Revisado por pares
Monik Begname de Castro, Ana Carolina Maioli Campos Barbosa, Patrícia Vieira Pompeu, Pedro V. Eisenlohr, Gabriel Pereira, Deborah M. G. Apgaua, João Carlos Pires‐Oliveira, João Paulo Rodrigues Alves Delfino Barbosa, Marco Aurélio Leite Fontes, Rubens Manoel dos Santos, David Y. P. Tng,
Tópico(s): Plant and animal studies
2019 - Springer Science+Business Media | Biodiversity and Conservation
Produção Nacional
Revisado por pares
R.S. Santos, Guilherme Abreu Faria, C. Giles, Carlos A. P. Leite, Herbert de Sousa Barbosa, Marco Aurélio Zezzi Arruda, Claudia Longo,
Iron-doped TiO(2) (Fe:TiO(2)) nanoparticles were synthesized by the sol-gel method (with Fe/Ti molar ratio corresponding to 1, 3, and 5%), followed by hydrothermal treatment, drying, and annealing. A similar methodology was used to synthesize TiO(2) and α-Fe(2)O(3) nanoparticles. For comparison, a mixture hematite/titania, with Fe/Ti = 4% was also investigated. Characterization of the samples using Rietveld refinement of X-ray diffraction data revealed that TiO(2) consisted of 82% anatase and 18% brookite; ...
Tópico(s): Iron oxide chemistry and applications
2012 - American Chemical Society | ACS Applied Materials & Interfaces
Produção Nacional
Revisado por pares
Vera B. Henriques, Nara Guisoni, Marco Aurélio A. Barbosa, Marcelo Thielo, Márcia C. Barbosa,
We analyze the possible phase diagrams of a simple model for an associating liquid proposed previously. Our two-dimensional lattice model combines oreintati onal ice-like interactions and \"{}Van der Waals\"{} interactions which may be repulsive, and in this case represent a penalty for distortion of hydrogen bonds in the presence of extra molecules. These interactions can be interpreted in terms of two competing distances, but not necessarily soft-core. We present mean -field calculations and an exhaustive ...
Tópico(s): Theoretical and Computational Physics
2005 - Taylor & Francis | Molecular Physics
Produção Nacional
Marco Aurélio A. Barbosa, Leandro G. Garcia, Antônio F. Pereira de Araújo,
Conformational restrictions imposed by hydrogen bond formation during protein folding are investigated by Monte Carlo simulations of a non-native-centric, two-dimensional, hydrophobic model in which the formation of favorable contacts is coupled to an effective reduction in lattice coordination. This scheme is intended to mimic the requirement that polar backbone groups of real proteins must form hydrogen bonds concomitantly to their burial inside the apolar protein core. In addition to the square ...
Tópico(s): Spectroscopy and Quantum Chemical Studies
2005 - American Physical Society | Physical Review E
Produção Nacional
Revisado por pares
Renan Cunha, Lucas Lafetá, Emerson A. Fonseca, Alexandre Simões Barbosa, Marco Aurélio Romano‐Silva, Rafael P. Vieira, Ado Jório, Leandro M. Malard,
Given the long subclinical stage of Alzheimer's disease (AD), the study of biomarkers is relevant both for early diagnosis and the fundamental understanding of the pathophysiology of AD. Biomarkers provided by amyloid-${\unicode[Times]{x3B2}}$ (A${\unicode[Times]{x3B2}}$) plaques have led to an increasing interest in characterizing this hallmark of AD due to its promising potential. In this work, we characterize A${\unicode[Times]{x3B2}}$ plaques by label-free multimodal imaging: we combine two-photon ...
Tópico(s): Protein Interaction Studies and Fluorescence Analysis
2021 - Royal Society of Chemistry | The Analyst
Produção Nacional
Revisado por pares
Iran José Oliveira da Silva, José Antônio Delfino Barbosa Filho, Marco Aurélio Neves da Silva, Sônia Maria de Stéfano Piedade,
Este estudo foi realizado com os objetivos de avaliar o comportamento e o bem-estar de aves em um sistema de criação em cama e ninho, em comparação a um sistema de criação convencional (bateria de gaiolas), e estudar a influência das condições ambientais (estresse e conforto) no comportamento de poedeiras. Dois grupos de dez aves (dez Hy-line W36 e dez Hy-line Brown) em início de postura foram submetidos a duas condições ambientais (26°C e 60% UR e 35°C e 70%UR) e dois sistemas de criação (bateria de ...
Tópico(s): Rabbits: Nutrition, Reproduction, Health
2006 - Sociedade Brasileira de Zootecnia | Revista Brasileira de Zootecnia
Produção Nacional
Revisado por pares
Fabrício Henrique Moreira Salgado, Fátima Maria de Souza Moreira, José Oswaldo Siqueira, Ricardo Henrique Barbosa, Helder Barbosa Paulino, Marco Aurélio Carbone Carneiro,
ABSTRACT: The objective of this study was to evaluate the effects of inoculation with different arbuscular mycorrhizal fungi native to Cerrado, associated with the application of colonization stimulant (7-hydroxy, 4’-methoxy-isoflavone) at the initial growth of cotton and maize plants in a greenhouse. The experiment was carried out in a completely randomized design and 7x2 factorial scheme, with five species of arbuscular mycorrhizal fungi and combined inoculation (uniting all species in equal proportion) ...
Tópico(s): Banana Cultivation and Research
2017 - UNIVERSIDADE FEDERAL DE SANTA MARIA | Ciência Rural
Karla Stephanie Martinez-Elizalde, Manuel Jiménez‐Estrada, César M. Flores-Ortíz, Luis Barbo Hernandez, Rocío Rosas-López, Ángel Durán-Díaz, Óscar Nieto-Yáñez, Elizabeth Barbosa, Marco Aurelio Rodríguez-Monroy, Margarita Canales-Martínez,
The fruit of Cyrtocarpa procera is used to treat stomach diseases by people living in San Rafael, Coxcatlan, Puebla. This work investigated the antibacterial, antioxidant, cytotoxic and anti-inflammatory activities of the fruit produced by this species. Methanol extract was obtained by maceration. After obtaining the methanol extract (MeOH1), methanol subextract (MeOH2) and hexane (H) were obtained. The antibacterial activities of MeOH1, MeOH2 and H were evaluated through disc-diffusion. The quenching ...
Tópico(s): Phytochemicals and Antioxidant Activities
2015 - BioMed Central | BMC Complementary and Alternative Medicine
Produção Nacional
Revisado por pares
Eduardo O. Rizzatti, Marco Aurélio A. Barbosa, Márcia C. Barbosa,
Tópico(s): Phase Equilibria and Thermodynamics
2017 - Higher Education Press | Frontiers of Physics
Produção Nacional
Revisado por pares
Márcio S. Gomes-Filho, Fernando A. Oliveira, Marco Aurélio A. Barbosa,
A computational model is proposed to investigate drug delivery systems in which erosion and diffusion mechanisms are participating in the drug release process. Our approach allowed us to analytically estimate the crossover point between those mechanisms through the value of the parameter b (b_{c}=1) and the scaling behavior of parameter τ on the Weibull function, exp[-(t/τ)^{b}], used to adjust drug release data in pharmaceutical literature. Numerical investigations on the size dependence of the ...
Tópico(s): Protein purification and stability
2022 - American Physical Society | Physical review. E
Produção Nacional
Marco Aurélio Barbosa Alves, Daniela Roberta Borella, Camila Calazans da Silva Luz, Daniela Castagna, Wanderson Carvalho da Silva, Apoliano Francisco da Silva, Frederico Terra de Almeida, Adilson Pacheco de Souza,
Em função dos avanços dos sistemas de produção agropecuária e da crescente demanda por alimentos no mundo, ainda é proeminente, a necessidade de se investigar as relações existentes entre os atributos do solo e as diferentes condições ambientais em que estão inseridos. Existem diversos produtos científicos que apresentam as caracterizações dos solos brasileiros, contudo, dependendo da aplicação, as maiores limitações estão vinculadas à escalas espaciais e amostragens em regiões isoladas. Neste trabalho ...
Tópico(s): Soil Management and Crop Yield
2022 - UNIVERSIDADE FEDERAL DE MATO GROSSO | Nativa
Produção Nacional
Revisado por pares
Fernando Barbosa V. da Silva, Fernando A. Oliveira, Marco Aurélio A. Barbosa,
The thermodynamic and kinetics of the one dimensional lattice gas with repulsive interaction is investigated using transfer matrix technique and Monte Carlo simulations. This simple model is shown to exhibit waterlike anomalies in density, thermal expansion coefficient and self diffusion. An unified description for the thermodynamic anomalies in this model is achieved based on the ground state residual entropy which appears in the model due to mixing entropy in a ground state phase transition.
Tópico(s): Advanced Thermodynamics and Statistical Mechanics
2015 - American Institute of Physics | The Journal of Chemical Physics
Produção Nacional
Revisado por pares
Célia Marisa Rizzatti‐Barbosa, Marco Aurélio Fraga, Tarcísio de Moraes Gonçalves,
The purpose of this work was to analyze water sorption by polymerized acrylic resins under different pressure, temperature and time treatments. A thermo-cured acrylic resin was used as the denture base (Classico Ltda.) and ethylene glycol di-methacrylate as a cross-linking agent, with processing carried out in a water bath at 73 °C for nine hours. Forty-five samples were prepared following the criteria and dimensions of specification # 12 of the American Dental Association (ADA), using a matrix in the ...
Tópico(s): Dental materials and restorations
2001 - Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímer | Materials Research
Produção Nacional
Revisado por pares
Julian David Hunt, Benoit Lagore, Roberto Brandão, Fabio A. Diuana, Emanuele Quaranta, Murilo de Miranda, Ana Lacorte, Paulo S. F. Barbosa, Marcos Aurélio Vasconcelos de Freitas, Behnam Zakeri, Nivalde José de Castro, Yoshihide Wada,
The increasing utilization of wind and solar power sources to lower CO2 emissions in the electric sector is causing a growing disparity between electricity supply and demand. Consequently, there is a heightened interest in affordable energy storage solutions to address this issue. Pumped Hydropower Storage (PHS) emerges as a promising option, capable of providing both short and long-term energy storage at a reasonable cost, while also offering the advantage of freshwater storage. To identify potential ...
Tópico(s): Electric Power System Optimization
2023 - Elsevier BV | Journal of Energy Storage
Produção Nacional
Elthon Silveira Cressoni, Luiz Ernesto Avanci, Domingo Marcolino Braile, Ana Paula Marques Lima-Oliveira, Sebastião Roberto Taboga, Antônio Sérgio Martins, Rosa Sayoko Kawasaki Oyama, Marcos Aurélio Barbosa de Oliveira,
To experimentally compare the structural and ultrastructural changes in isolated hypertrophied rabbits' hearts submitted to cardiac arrest protected using sanguineous and crystalloid cardioplegia solutions.The study comprised two experimental groups and one control group. In Experimental Group I, cardiac arrest was achieved by the continuous infusion of tepid sanguineous cardioplegia solution. In Experimental Group II, cardiac arrest was obtained by an intermittent infusion of a cold crystalloid ...
Tópico(s): Fuel Cells and Related Materials
2007 - Brazilian Society of Cardiovascular Surgery | Brazilian Journal of Cardiovascular Surgery
Produção Nacional
Revisado por pares
Ronaldo Lopes Oliveira, Adriana Regina Bagaldo, Márcio Machado Ladeira, Marco Aurélio Alves de Freitas Barbosa, Renata Lopes de Oliveira, Soraya Maria Palma Luz Jaeger,
Os efeitos da suplementação de fontes lipídicas sobre o consumo, a digestibilidade dos nutrientes e o N-uréico plasmático foram avaliados em 12 búfalas lactantes, em três quadrados latinos simultâneos, cada um com quatro animais, quatro períodos e quatro dietas contendo uma das fontes de lípideo estudadas (sem lipídeo adicional; grão de soja; óleo de soja ou caroço de algodão). O período experimental foi de 84 dias, com quatro períodos de 21 dias, divididos em 14 dias para a adaptação e 7 para coleta. ...
Tópico(s): Rabbits: Nutrition, Reproduction, Health
2009 - Sociedade Brasileira de Zootecnia | Revista Brasileira de Zootecnia