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Electron-Domain Wall Interaction with a Ferromagnetic Spherical Domain Wall

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Journal of Modern Physics 2016年第13期7卷 1635-1643页

作者： leonardo dos santos Lima departamento de Física e Matemática Centro Federal de Educa&ccedil&atildeo Tecnológica de Minas Gerais Belo Horizonte Brazil

The interaction between an electron with a three-dimensional domain wall was investigated using the Born’s expansion of the S scattering matrix. We obtain an influence of the scattering of the electron with the ferromagnetic domain wall in the spin wave function of the electron with the aim to generate the knowledge about the state of the electron spin after the scattering. It relates to the recent problem of generation of the spin polarized electric current. We also obtain the contribution of the electron-wall domain interaction on the electric conductivity , through the wall domain, where we have obtained a peak of resonance in the conductivity for one value of .

关键词： Electron Scattering Domain-Wall Ferromagnet

Characterization of Arroyo Verde Epithermal deposit:Paragenesis,Mineral Geochemistry,Geochronology and Fluid Inclusions in Lower Chon Aike Volcanism,Argentina

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Journal of Earth Science 2024年第1期35卷 62-84页

作者： Cecilia Pavón Pivetta leonardo Benedini Paulo Marcos Ma.Agustina Cócola Mercedes Virginia Barros Daniel Gregori leonardo Strazzere Anderson Costa dos santos Mauro C.Geraldes Instituto Geologico del Sur(INGEOSUR) Universidad Nacional del Sur(UNS)-Consejo Nacional de Investigaciones Cientificas y Tecnicas(CONICET)Bahia Blanca 8000Argentina Dpto.de Geologia Universidad Nacional del Sur(UNS)Bahia Blanca 8000Argentina Universidad Nacional de Rio Negro Instituto de Investigacion en Paleobiologia y GeologiaGeneral Roca 8332Argentina Universidade do Estado do Rio de Janeiro Faculdade de GeologiaDepartamento de Mineralogia e Petrologia igneaRiodeJaneiro20559-900Brazil Geobiotec Departamento de GeocienciasUniversidade de AveiroAveiro 3800-002Portuga

Arroyo Verde epithermal deposit,in the North Patagonia region of Argentina,is located within the Lower Chon Aike volcanism and is developed between 192.6±2.5 Ma(mineralization host rock)and 189.5±2.6 Ma(overlying lava).Marifil volcanic complex is the host rock for these veins,veinlets and *** particular small deposit has developed low to intermediate sulphidation characteristics,with gangue mineral textures associated with several ore *** probe microanalysis determines electrum,silver minerals such as acanthite,and tetrahedrite,related Ag-Cu minerals like jalpaite,mckinstryite,stromeyerite,and base metals like chalcopyrite,sphalerite,galena and *** inclusions in quartz of two out of five events indicate that these Low Jurassic veins were formed due to subtle boiling and dilution mechanisms and by low-salinity(3.4 wt.%to 6.7 wt.%NaCl Eq)magmatic-hydrothermal fluid at 225 to 310℃.The fluid inclusion measurements that indicate boiling(Event 3)were plotted,and based on this data,we interpret that the Arroyo Verde deposit has been eroded between 550 and 700 *** particular character has not been previously recorded for other sectors of the eastern north Patagonian region.

关键词： epithermal deposit Ag minerals mineral geochemistry fluid inclusions Chon Aike geochronology

Dietary approach in the treatment of nonalcoholic fatty liver disease

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World Journal of Hepatology 2015年第24期7卷 2522-2534页

作者： Silvia Marinho Ferolla Luciana Costa Silva Maria de Lourdes abreu Ferrari Aloísio Sales da Cunha Flaviano dos santos Martins Cláudia Alves Couto Teresa Cristina abreu Ferrari departamento de Clínica Médica Centro de Pós-GraduacaoFaculdade de MedicinaUniversidade Federal de Minas GeraisBelo Horizonte 30130-100Minas GeraisBrazil departamento de Propedêutica Complementar Faculdade de MedicinaUniversidade Federal de Minas GeraisBelo Horizonte 30130-100Minas GeraisBrazil departamento de Microbiologia Instituto de Ciências BiológicasUniversidade Federal de Minas GeraisBelo Horizonte 31270-901Minas GeraisBrazil

Nonalcoholic fatty liver disease(NAFLD) has been identified as one of the most prevalent chronic liver disease in adults and children populations. NAFLD is usually associated with the metabolic syndrome(MS), which is chiefly related to insulin resistance and its consequences. Insulin resistance has a crucial role in the pathogenesis of hepatic steatosis and potentially nonalcoholic steatohepatitis(NASH). Because of the contemporary epidemics of MS and obesity, the burden of NAFLD is also expected to rise. Unhealthy diets, such as the so-called western diet, are enriched in fructose, trans-fatty acids and saturated fat and seem to be associated with the development of NAFLD. In human studies, certain dietary sugars, particularly fructose, are used as a substrate for lipogenesis leading to hepatic fatty infiltration, inflammation, and possibly fibrosis. Other investigations have shown that fat consumption especially cholesterol and trans/saturated fatty acids are also steatogenic and seem to increase visceral adiposity. The identification of specific dietary components that favor the development of NASH could be important for the management of this disorder. This review focuses on the effects of different dietary approaches to prevent and treat NAFLD emphasizing the macronutrients and energy composition.

关键词： Fatty liver Dietary carbohydrates Dietary fats Die

Best practices for electrochemical characterization of supercapacitors

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Journal of Energy Chemistry 2023年第5期80卷 265-283,I0007页

作者： João Pedro Aguiar dos santos Fernando Cesar Rufino Joǎo IYutaka Ota Rodolfo CFernandes Rafael Vicentini Cesar JBPagan leonardo Morais Da Silva Hudson Zanin Brazilian Renewable Energies Center for Innovation on New EnergiesSchool of Electrical and Computer EngineeringUniversity of CampinasSP 13083-852Brazil School of Electrical and Computer Engineering University of CampinasSP 13083-852Brazil department of Chemistry Laboratory of Fundamental and Applied ElectrochemistryFederal University of Jequitinhonha e Mucuri's ValleyRodovia MGT 367km 5835000Alto da Jacuba39100-000 DiamantinaMGBrazil

We discuss here essential aspects of the experimental supercapacitors characterization by a series of well-known electrochemical *** are motivated by a considerable number of publications that misreport procedures and *** often conceal or neglect essential information about the electrochemical analytical apparatus used and its *** lack of such information may lead researchers,especially inexperienced ones,to misunderstand the procedures and ***,the misled electrochemical equipment configuration favors misinterpretation of data and low reproducibility *** paper aims to highlight these issues and clarify *** explain fundamental concepts of some electrochemical analytical methods,such as cyclic voltammetry,galvanostatic charge-discharge,single potential step chronoamperometry,and electrochemical impedance spectroscopy,focusing on the supercapacitor *** configurations of electrical parameters are presented and discussed to highlight the effects of incorrect setup and uncover misleading *** discuss how the electrochemical setup and data analyses matter in reliable data results for the supercapacitor.

关键词： Supercapacitor Electrochemical instrumentation Electrochemical methods Electrochemistry

Ion dynamics into different pore size distributions in supercapacitors under compression

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Journal of Energy Chemistry 2023年第5期80卷 110-119,I0004页

作者： João Pedro Aguiar dos santos Cesar J.B.Pagan Rafael Vicentini Reinaldo F.Teófilo Renato Beraldo leonardo M.Da Silva Hudson Zanin Brazilian Renewable Energies Center for Innovation on New EnergiesSchool of Electrical and Computer EngineeringUniversity of CampinasAv.Albert Einstein 40CampinasSP13083-852Brazil School of Electrical and Computer Engineering University of CampinasSP 13083-852Brazil Multivariate Chemical Data Analysis Laboratory Department of ChemistryUniversidade Federal de Viçosa36570-900 ViçosaMGBrazil department of Chemistry Laboratory of Fundamental and Applied ElectrochemistryFederal University of Jequitinhonha and Mucuri's ValleyRodovia MGT 367km 5835000 Alto da Jacuba39100-000DiamantinaMGBrazil

Compressing supercapacitor(SCs)electrode is essential for improving the energy storage characteristics and minimizing ions’distance travel,faradaic reactions,and overall ohmic *** comprising the ion dynamics in SC electrodes under compression are still ***,the ionic dynamics of five aqueous electrolytes in electrodes under compression were studied in this work for tracking electrochemical and structural changes under mechanical stress.A superionic state is formed when the electrode is compressed until the micropores match the dimensions with the electrolyte’s hydrated ion sizes,which increases the *** excessive compression is applied,the accessible pore regions decrease,and the capacitance ***,as the studied hydrated ions have different dimensions,the match between ion/pore sizes *** the LiOH and NaClO4electrolytes,increasing the pressure from 60 to 120 and 100 PSI raised the capacitance from 13.5 to 35.2 F g^(-1)and 30.9 to 39.0 F g^(-1),***,the KOH electrolyte with the lowest and LiCl with the biggest combination of hydrated ion size have their point of maximum capacitance(39.5 and 36.7F g^(-1))achieved at 140 and 80 PSI,*** LiCl and KCl electrolytes,overcompression causes a drop in capacitance higher than 23%.

关键词： Mechanic compression Pore size distribution lon dynamics Activated carbon Supercapacitors

Chemical and microbiological characterization of tinctures and microcapsules loaded with Brazilian red propolis extract

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Journal of Pharmaceutical Analysis 2017年第5期7卷 280-287页

作者： Erika Tayse da Cruz Almeida Maria Cristina delgado da Silva José Marcos dos santos Oliveira Regianne Umeko Kamiya Rodolfo Elleson dos santos Arruda Danilo abreu Vieira Valdemir da Costa Silva Pierre Barnabé Escodro Irinaldo Diniz Basílio-Júnior Ticiano Gomes do Nascimento Laboratório de Controle de Qualidade e Análise de Fármacos Medicamentos e AlimentosCurso de FarmáciaEscola de Enfermagem e FarmáciaUniversidade Federal de AlagoasCampus A.C.SimõesBR 104 Norte-Km 97MaceióAL.CEP:57072-970Brazil Laboratório de Controle de Qualidade Microbiológico de Alimentos Faculdade de NutriçãoUniversidade Federal de AlagoasCampus A.C.SimõesBR 104 Norte/Km 97MaceióAL.CEP:57072-970Brazil

The aim of this study was to characterize tinctures and microcapsules loaded with an ethanol extract of red propolis through chemical, physicochemical and microbiological assays in order to establish quality control tools for nutraceutical preparations of red propolis. The markers(isoflavonoids, chalcones, pterocarpans,flavones, phenolic acids, terpenes and guttiferones) present in the tinctures A and B were identified and confirmed using LC/ESI/FTMS/Orbitrap. Four compositions(A, B, C and D) were prepared to contain B tincture of the red propolis with some pharmaceutical excipients and submitted to two drying processes, i. ***-drying and freeze-drying to obtain microcapsules loaded with the red propolis extract. The tinctures and microcapsules of the red propolis were submitted to the total flavonoid content and antioxidant activity *** antibacterial activity and minimum inhibitory concentration(MIC) were tested using Staphylococcus aureus ATCC 25293 and Pseudomonas aeruginosa ATCC 27853 strains. The tinctures and microcapsules presented high flavonoid quantities from 20.50 to 40.79 mg/100 mg of the microcapsules. The antioxidant activity and IC50 were determined for the tinctures A and B(IC50: 6.95 μg/m L and 7.48 μg/m L), the spray-dried microcapsules(IC50: 8.89–15.63 μg/m L) and the freeze-dried microcapsules(IC50: 11.83–23.36 μg/m L). The tinctures and microcapsules were proved to be bioactive against gram-positive and gram-negative bacteria with inhibition halos superior to 10 mm at concentration of 200 μg/m L and MIC values of 135.87–271.74 μg/m L using gram-positive strain and 271.74–543.48 μg/m L using gram-negative strain. The tinctures and microcapsules of the red propolis have a potential application for nutraceutical products.

关键词： Red propolis Tinctures Microcapsules Isoflavonoids LC/ESI/FTMS/Orbitrap Antioxidant activity Antibacterial activity

Nonlinear optical characterization of single β-barium-borate nanocrystals using second-harmonic confocal microscopy

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Chinese Optics Letters 2018年第4期16卷 81-85页

作者： Rodrigo G.dos santos Lauro J.Q.Maia Cid B.de Araújo leonardo de S.Menezes departamento de Fisica Universidade Federal de PernambucoRecife-PE 50670-901Brazil Instituto de Fisica Universidade Federal de CoiasCoiania-CO 74001-970Brazil

The confocal microscopy technique was applied for nonlinear optical characterization of single β-barium-borate（β-BBO） nanocrystals. The experimental setup allows measurements of the laser polarization-selective secondharmonic（SH） generation, and the results can be used to determine the nanocrystals＇ c-axis orientation, as well as to obtain information about their second-order susceptibility χ^（2）. The dependence of the SH signal on the laser polarization allowed the discrimination of individual particles from aggregates. The data were fitted using a model that takes into account the BBO properties and the experimental setup characteristics considering（i） the electrostatic approximation,（ii） the effects of the microscope objective used to focus the light on the sample in an epi-geometry configuration, and（iii） the symmetry of χ^（2） for the β-BBO nanocrystals. A signal at the third-harmonic frequency was also detected, but it was too weak to be studied in detail.

关键词： SH BBO HR barium-borate nanocrystals using second-harmonic confocal microscopy Nonlinear optical characterization of single

Reference genes for quantitative RT-PCR data in gastric tissues and cell lines

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World Journal of Gastroenterology 2013年第41期19卷 7121-7128页

作者： Fernanda Wisnieski Danielle Queiroz Calcagno Mariana Ferreira Leal leonardo Caires dos santos Carolina de Oliveira Gigek Elizabeth Suchi Chen Thaís Brilhante Pontes Paulo Pimentel Assumpo Mnica Barauna de Assumpo Smia demachki Rommel Rodríguez Burbano Marília de Arruda Cardoso Smith Disciplina de Genética Departamento de Morfologia e GenéticaUniversidade Federal de So PauloSo Paulo 04023900Brazil departamento de Ortopedia e Traumatologia Universidade Federal de So PauloSo Paulo 04038031Brazil Núcleo de Pesquisa em Oncologia Hospital Joo de Barros BarretoUniversidade Federal do ParáBelém 60673000Brazil Laboratório de Citogenética Humana Instituto de Ciências BiológicasUniversidade Federal do ParáBelém 66075110Brazil

AIM:To evaluate the suitability of reference genes in gastric tissue samples and cell ***:The suitability of genes ACTB,B2M,GAPDH,RPL29,and 18S rRNA was assessed in21 matched pairs of neoplastic and adjacent nonneoplastic gastric tissues from patients with gastric adenocarcinoma,27 normal gastric tissues from patients without cancer,and 4 cell lines using reverse transcription quantitative real-time polymerase chain reaction(RT-qPCR).The ranking of the best single and combination of reference genes was determined by NormFinder,geNorm,BestKeeper,and *** addition,GenEx software was used to determine the optimal number of reference *** validate the results,the mRNA expression of a target gene,DNMT1,was quantified using the different reference gene combinations suggested by the various software packages for ***:ACTB was the best reference gene for all gastric tissues,cell lines and all gastric tissues plus cell ***+B2M or ACTB+B2M was the best combination of reference genes for all the gastric *** the other hand,ACTB+B2M was the best combination for all the cell lines tested and was also the best combination for analyses involving all the gastric tissues plus cell *** to the GenEx software,2 or 3 genes were the optimal number of references genes for all the gastric *** relative quantification of DNMT1 showed similar patterns when normalized by each combination of reference *** level of expression of DNMT1 in neoplastic,adjacent non-neoplastic and normal gastric tissues did not differ when these samples were normalized using GAPDH+B2M(P=0.32),ACTB+B2M(P=0.61),or GAPDH+B2M+ACTB(P=0.44).CONCLUSION:GAPDH+B2M or ACTB+B2M is the best combination of reference gene for all the gastric tissues,and ACTB+B2M is the best combination for the cell lines tested.

关键词： Gastric cancer Reference gene Normalization Gene expression Quantitative real-time polymerase chain reaction

Study of Reinforcement Distribution,Adhesion between Layers,and Porosity Induced by FDM

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材料科学与工程（中英文A版） 2021年第2期11卷 56-62页

作者： Arthur Wernke Rafael dos santos leonardo santos Manuel Barcelos Jr Emmanuel Lima Laboratório Associado de Sensores e Materiais Instituto Nacional de Pesquisas Espaciais(INPE)Avenida dos Astronautas 1758São Josédos Campos-SP 12245-970Brazil Faculdade do Gama(FGA) Universidade de Brasília(UnB)St.Leste Projeção AGama-DF 72444-240Brazil

This study aims to understand the distribution of reinforcement material in the matrix,evaluate the adherence between layers,and determine the air gap between printing *** printed the specimen with two different composite materials,Polylactic Acid(PLA)reinforced with acrylic particles,and another filament reinforced with short carbon *** the observations of the samples,we used a Confocal *** estimated the porosity of the material by comparing the expected mass with that achieved after *** pixel count,after binarization,we found the average percentage of acrylate *** showed fair distribution through the PLA matrix even after the manufacturing *** determination of fibers alignment was made by binarization of image,together with k-means and edge *** combination of methods allows estimating the fiber alignment by orientation straight *** manufacturing process did not offer good alignment of the fibers,even with the filament initially well aligned.

关键词： 3D printing porosity in 3D printed parts 3D printed composite materials