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Structural effects induced by dialysis-based purification of carbon nanomaterials

Nano materials Science 2024年第4期6卷 475-483页

作者： A.D.Veloso A.m.Ferraria a.m.botelho do rego A.S.Viana A.J.S.Fernandes A.J.Fielding R.A.Videira m.C.Oliveira CQ-VR and Chemistry Department University of Trás-os-Montes e Alto Douro BSIRG iBB-Institute for Bioengineering and BiosciencesDepartment of Chemical Engineeringand Associate Laboratory i4HB-Institute for Health and BioeconomyInstituto Superior TécnicoUniversidade de Lisboa Centro de Química Estrutural Institute of Molecular SciencesDepartamento de Química e BioquímicaFaculdade de CiênciasUniversidade de Lisboa I3N and Physics Department University of AveiroCampus de Santiago Faculty of Science Pharmacy and Biomolecular SchoolLiverpool John Moores University REQUImTE/LAQV Laborat orio de FarmacognosiaDepartamento de QuímicaFaculdade de Farm aciaUniversidade do Porto

Dialysis plays a crucial role in the purification of nanomaterials but its impact on the structural properties of carbon nanomaterials was never ***,a carbon-based nanomaterial generated electrochemically in potassium phosphate buffer,was characterized before and after dialysis against pure *** is shown that dialysis affects the size of the carbon domains,structural organization,surface functionalization,oxidation degree of carbon,and grade of ***,dialysis drives the nanomaterial organization from discrete roundish carbon domains,with sizes ranging from 70 to 160 nm,towards linear stacking structures of small nanoparticles （m）.In parallel,alcohol and ether （epoxide） surface groups evolve into more oxidized carbon groups （e.g.,ketone and ester groups）.Investigation of the as-prepared nanomaterial by electron paramagnetic resonance （EPR） revealed a resonance signal consistent with carbon-oxygen centred ***,this study brings to light the selective affinity of the carbon nanomaterial under study to capture Na+ions,a property greatly enhanced by the dialysis process,and its high ability to trap oxygen,particularly before *** findings open new perspectives for the application of carbon-based nanomaterials and raise awareness of the importance of structural changes that can occur during the purification of carbon-based nanomaterials.

关键词： Nanocarbon Surface functionalization NmR XPS Hydrophilic carbon Paramagnetic

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Effect of solidification process parameters on dry sliding wear behavior of AlNiBi alloy

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Transactions of Nonferrous metals Society of China 2020年第3期30卷 582-594页

作者： T.m.botelho H.m.AZEVEdo G.H.mACHAdo C.R.BARBOSA F.S.ROCHA T.A.COSTA O.L.ROCHA Federal Institute of Education Science and Technology of ParáIFPAAlmirante Barroso Avenue 115566093-020 BelémPABrazil Institute of Technology Federal University of ParáUFPAAugusto Correa Avenue 166075-110 BelémPABrazil

As-cast samples of the Al-3wt.%Ni-lwt.%Bi alloy resulting from the horizontal directional solidification process were subjected to the micro-abrasive wear *** effects of the solidification thermal and microstructural parameters,such as the growth and cooling rates and the cellular and primary dendritic spacings(VL and TR;λ1 and λc;respectively),were evaluated in the wear resistance of the investigated *** tribological parameters analyzed were the wear volume and rate(Vw and Rw).The solidification experiments and the wear tests were carried out by means of a water-cooled horizontal directional solidification device and a rotary-fixed ball wear machine,*** results show lower Vw and Rw values correspond to finer microstructures and the Vw dependence on λ1 is characterized by an experimental mathematical equation.A better distribution of Bi soft droplets and Al3Ni hard intermetallic particles is observed within the finer interdendritic region and,in consequence,the better wear resistance is achieved in as-cast samples with dendritic morphology rather than cellular morphology.A transition of wear mechanism from adhesive to abrasive is observed.

关键词： unsteady-state horizontal solidification dry sliding wear cellular/dendrite arm spacing microhardness Bi particle Al_(3)Ni particle

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Electromagnetic Characterization of Recyclable Polymer Nanofibers Based on PSU/Carbonyl Iron

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Journal of Renewable materials 2019年第3期7卷 279-287页

作者： Daniel Consoli Silveira Tiago Teixeira da Silva Braga Daniel molina Gil Newton Adriano dos Santos Gomes Lilia müller Guerrini Edson Cocchieri botelho Department of materials and Technology Sao Paulo State University(UNESP)School of EngineeringGuaratinguetá/SP-Brazil Electronic Warfare Laboratory Technological Institute of Aeronautics(ITA)Sao Josédos Campos/SP-Brazil Institute of Science and Technology Federal University of Sao Paulo(UNIFESP)Sao Josédos Campos/SP-Brazil

This study investigated and defined the optimal processing parameters for the electrospinning of polysulfone polymer solutions with N,*** of parameters such as solute concentration,electrical voltage,and working distance were correlated with the quality of the obtained nanofibers using morphological characterization via scanning electron microscopy(SEm).Carbonyl iron additive was dispersed in the polymer solutions,using ultrasonic tip,and the material processed via electrospinning with aforementioned parameters *** with the property of interaction with electromagnetic waves were *** dispersion of different concentrations of the additive and electromagnetic characterizations in the X-band of microwaves(8.2 and 12.4 GHz),using vector network analyzer(VNA)and rectangular waveguide,allowed the identification of the materials electromagnetic *** parameters allowed the calculation of reflected and transmitted energy by the material.

关键词： Carbonyl iron electromagnetic characterization electrospinning nanofibers polysulfone

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Kinetic modeling of adsorption of vanadium and iron from acid solution through ion exchange resins

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Transactions of Nonferrous metals Society of China 2022年第7期32卷 2438-2450页

作者： JoséHelber VINCO Amilton Barbosa botelho JUNIOR Heitor Augusto DUARTE Denise Crocce Romano ESPINOSA Jorge Alberto Soares TENÓRIO Department of Chemical Engineering Polytechnic School of the University of São Paulo(USP)Rua do Lago25005508-080São PauloSPBrazil

This study assessed the adsorption process and the reaction kinetics involved in the selective recovery of vanadium from an acid solution containing iron as an *** commercial resins were studied:Lewatit^(®)monoPlus TP 209 XL,Lewatit^(®) TP 207,dowex^(Tm)m4195(chelating resin)and Lewatit^(®) monoPlus S 200 H(strong cationic exchange resin).To investigate the effect of time on the adsorption process,batch experiments were carried out using the following initial conditions:pH 2.0,298 K,and a proportion of 1 g of resin to 50 mL of *** variation of pH over time was *** resin released less H+ions as the adsorption occurred,resulting in a lower drop of pH when compared to S 200 H *** adsorption by the resins was also evaluated through FT-IR and SEm−EDS before and after the *** the evaluated kinetic models(pseudo-first order,pseudo-second order,Elovich and intraparticle diffusion models),the pseudo-second order model best fits the experimental data of the adsorption of vanadium and iron by all of the four resins.m4195 resin showed the highest recovery of vanadium and the lowest adsorption of *** data,which are fundamental to industrial processes applications,are provided.

关键词： vanadium recovery adsorption chelating resins metal ions cation exchange resin batch experiments

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Program for Solar Water Heating Systems Based on the F-Chart method

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Journal of mechanics Engineering and Automation 2014年第9期4卷 752-762页

作者： Felix do rego Barros Adriano Gatto Lemos Sildenir Alves Ribeiro manoel Antonio da Fonseca Costa Filho Coordination of Industrial Automation CEFET (Federal Center of Technological Education) Rio de Janeiro 20785-902 Brazil Coordination of Automotive maintenance CEFET (Federal Center of Technological Education) Rio de Janeiro 20785-902 Brazil Department of mechanical Engineering UERJ (State University of Rio de Janeiro) Rio de Janeiro 20940-200 Brazil

This paper aims at presenting an application developed in Java for optimizing the design of centralized solar water heating systems with forced circulation, based on the f-chart method. The program uses data from the Brazilian Solar Atlas, performance data of flat plate collectors and thermal reservoirs from the standardized tests run within the Brazilian Labeling Program, and values of water consumption of appliances defined by the ABNT. The program finds the inclination of the collector that maximizes the annual solar fraction, or for the winter, and enables the use of arrays in series and parallel collectors. From the investment costs and O ＆ m （operations and maintenance） of solar heating systems, the program carries out economical analysis using classical parameters as net present value, discounted payback and internal rate of return. The program was validated through examples from the book of Duffle ＆ Beckman and also by comparison with the results from a project developed at UFRGS, having obtained good agreement.

关键词： Solar water heating f-chart method solar collectors.

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The cardiovascular aspects of a ménière’s disease population——A pilot study

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Journal of Otology 2019年第2期14卷 51-56页

作者： Angela Reis rego David Dias Ana Pinto SANDra Sousa e Castro Telma Feliciano Cecília Almeida e Sousa ENT Department Centro Hospitalar e Universitário do Porto Largo do Prof.Abel Salazar

Introduction:mD is considered a rare *** adequate model that explains mD's pathophysiology is not well ***,the vascular theory of the disease has been ***:To characterize a mD population according to its cardiovascular risk and correlate it to the mD clinical ***:In this retrospective chart study the data of 31 mD patients observed between January 2017 and April 2018 in a tertiary university hospital were *** included in the study were diagnosed according to the Barany Society *** follow-ups,patients with autoimmune disease,atopy or allergy,major psychiatric disease and migraine were ***,gender,cardiovascular risk factors,audiometric and vestibular parameters,occurrence of mD attacks in the previous 6 months,vestibular medication in course and time course of mD were recorded and compared between groups(with and without cardiovascular risk factors).Results:31 patients(61.3%females)mean aged 60.3 years(±9.7)were studied.74%of the population had at least one risk factor and 51.6%of patients had attacks in the last 6 *** was a statistically significant difference in the occurrence of mD attacks in the last 6 months(p=0.014)between mD patients with and without risk *** PTA thresholds were higher and speech discrimination was lower in individuals with more cardiovascular risk ***:Treatment of mD focusing on vascular risk factors may allow a better control of symptoms and result in a decreased need for ablative procedures in this disorder.

关键词： meniere disease Cardiovascular disease Hypertension Prognosis

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Co-expression of HBZ,TAX and FOXp3 and HTLV-1-associated myelopathy/tropical spastic paraparesis development in HTLV-1-infected individuals:A systematic review

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Asian Pacific Journal of Tropical medicine 2021年第8期14卷 333-340页

作者： Ana Carolina marinho monteiro Lima Greice Carolina Santos da Silva Fernanda Khouri Barreto Filipe Ferreira de Almeida rego Luana Leandro Gois Luciane Amorim Santos Catholic University of Salvador SalvadorBahiaBrazil multidisciplinary Institute in Health Federal University of BahiaVitoria da ConquistaBahiaBrazil Bahia School of medicine and Public Health SalvadorBahiaBrazil Postgraduate Program in Health Sciences Faculty of Medicine of BahiaFederal University of BahiaSalvadorBahiaBrazil

Human T-cell lymphotropic virus type 1(HTLV-1)is associated with the development of HTLV-1-associated myelopathy/tropical spastic paraparesis(HAm/TSP).It has been reported that the HTLV-1 proteins(specifically TAX and HBZ)can modulate FOXp3,resulting in an immune imbalance that can favor the progression of HAm/*** review aims to summarize the literature in order to clarify the relationship between the expression of HTLV-1 m RNAs and/or viral proteins(TAX and HBZ)with the expression of mRNA and/or protein FOXp3 and their correlation with HAm/TSP *** systematic review was conducted according to the recommendations of the Preferred Reporting Items for Systematic Reviews and *** search strategy was performed on the medical Literature Analysis and Retrieval System Online and Latin American and Caribbean Literature in Health Sciences Platform using subject *** screening,six articles were included in this *** studies suggested that TAX and HBZ have a directly proportional correlation with FOXp3 in individuals with HAm/TSP,which also presented an increased expression of FOXp3 compared to asymptomatic controls and/or healthy *** systematic review indicates that TAX and HBZ can interact with FOXp3 and that interaction may influence HAm/TSP development.

关键词： HTLV-1 HTLV-1-associated myelopathy/tropical spastic paraparesis(HAm/TSP) FOXp3 HBZ TAX

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Effects of autoclaving on the physiological action of paclobutrazol

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Agricultural Sciences 2011年第3期2卷 191-197页

作者： Dimas mendes Ribeiro Caroline müller Jackson Bedin Glayton botelho Rocha Raimundo Santos Barros Depto de Biologia Vegetal/Universidade Federal de Vicosa VicosaBrazil

Besides being employed as an efficient plant growth retardant for field, garden and potted plants, paclobutrazol (PBZ) is also used in laboratory experiments, mainly in aseptic cultures, both in autoclaved and non-autoclaved form. Therefore it is not known if autoclaving can partial or completely inactivates the product, thus decreasing its efficacy. Thus a simple experiment was carried out to assess to what extent the autoclaving process can affect some growth components and dry mass accumulation and partition in sunflower seedlings, by employing the techniques of plant Growth Analysis. Autoclaving did not modify either qualitative or quantitatively any of the plant responses to PBZ as well their reversions by gibberellic acid.

关键词： Autoclaving Dry mass Accumulation Gibberilins Growth Paclobutrazol Sunflower

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高血清感染率人群中围生期或生后早期CmV-血清反应阳性母亲分娩胎龄<34周早产儿的CmV感染

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世界核心医学期刊文摘（儿科学分册） 2005年第4期1卷 47-48页

作者： mussi-Pinhata m. m. Yamamoto A. Y. do Carmo rego m. A. 李丹

在前瞻性的研究中,评价了由巨细胞病毒(CmV)-血清反应阳性的母亲分娩胎龄<34周的新生儿(n=95)围生期或生后早期CmV感染的发生率、相关因素及其临床意义。无1例患先天性CmV感染。共发现21例感染者(22.1%;95%CI14.2-31.8);在生后60d内有1... 详细信息

在前瞻性的研究中,评价了由巨细胞病毒(CmV)-血清反应阳性的母亲分娩胎龄mV感染的发生率、相关因素及其临床意义。无1例患先天性CmV感染。共发现21例感染者(22.1%;95%CI14.2-31.8);在生后60d内有10例婴儿开始排出CmV,另有11例排出CmV的时间更晚。输血。

关键词： CmV感染围生期巨细胞病毒血清反应阴道分娩母乳喂养 transfusion 无症状 birth postnatal

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Therapy with bone marrow cells reduces liver alterations in mice chronically infected by Schistosoma mansoni

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World Journal of Gastroenterology 2008年第38期14卷 5842-5850页

作者： Sheilla Andrade Oliveira Bruno Solano Freitas Souza Carla Adriana Guimares-Ferreira Elton Sá Barreto Siane Campos Souza Luiz Antonio Rodrigues Freitas Ricardo Ribeiro-dos-Santos milena botelho Pereira Soares Centro de Pesquisas Gonalo moniz Fundao Oswaldo Cruz Rua Waldemar Falco 121 Brotas 40295-001 Salvador BA Brazil Centro de Pesquisas Aggeu Magalhes Fundao Oswaldo Cruz Recife Av Moraes Rego s/n Cidade Universitária Recife 50670-420 PE Brazil Centro de Pesquisas Gonalo moniz Fundao Oswaldo Cruz Rua Waldemar Falco 121 Brotas Salvador 40295-001 BA Brazil Centro de Pesquisas Gonalo moniz Fundao Oswaldo Cruz Rua Waldemar Falco 121 Brotas 40295-001 Salvador BA Brazil Hospital So Rafael Av So Rafael 2152 So Marcos Salvador 41256-900 BA Brazil

AIm： To investigate the potential of bone marrow mononuclear cells （Bm-mCs） in the regeneration of hepatic lesions induced by Schistosoma mansoni （***） chronic infection. mETHODS： Female mice chronically infected with *** were treated with Bm-mCs obtained from male green fluorescent protein （GFP） transgenic mice by intravenous or intralobular injections. Control mice received injections of saline in similar conditions, Enzyme-linked immunosorbent assay （ELISA） assay for transforming growth factor-beta （TGF-β）, polymerase chain reaction （PCR） for GFP DNA, immunofluorescence and morphometric studies were performed. RESULTS： Transplanted GFP^＋ cells migrated to granuloma areas and reduced the percentage of liver fibrosis. The presence of donor-derived cells was confirmed by Fluorescence in situ hybridization （FISH） analysis for detection of cells bearing Y chromosome and by PCR analysis for detection of GFP DNA. The levels of TGF-β, a cytokine associated with fibrosis deposition, in liver fragments of mice submitted to therapy were reduced. The number of oval cells in liver sections of ***-infected mice increased 3-4 fold after transplantation. A partial recovery in albumin expression, which is decreased upon infection with ***, was found in livers of infected mice after cellular therapy. CONCLUSION： In conclusion, transplanted BmCs migrate to and reduce the damage of chronic fibrotic liver lesions caused by ***.

关键词： Schistosoma mansoni Liver injury Fibrosis Bone marrow cells Transplantation Albumin Oval cells

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