Navegação Eventos - Resumos por ano de publicação "2017"

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  • IPEN-DOC 24517

    BARBOSA, HELLIOMAR P.; PEDROSO, CASSIO C.S.; FELINTO, MARIA C.F.C. ; MALTA, OSCAR L.; BRITO, HERMI F.. White light emission of the single-phase CaWO4:Dy3+ phosphors by simple synthesis and fast heating. In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 18th, August 27 - September 01, 2017, João Pessoa, PB. Abstract... 2017. p. 374-374.

    Abstract: Tungstates activated by trivalent rare earth ions (R3+) can be used for many optical devices [1]. Nowadays, there is an increasing interest in white phosphors emitting to application in white-light-emitting devices (WLEDs) replacing the conventional fluorescent lamps due its ecofriendliness and tuneable colours. Here we report preparation as well as the spectroscopic properties of the single phase new highly luminescent white emitting of Dy3+ doped into the CaWO4 materials. The materials were prepared by coprecipitation method at room temperature with stoichiometry aqueous solutions of Na2WO4, CaCl2 and DyCl3 (0.1 to 5.0 mol% of the Ca2+ amount). The as-prepared materials were heated for 22 min between 900 – 1000 W in a domestic microwave oven and using Fe3O4 (60 g) susceptor as heating source. The XPD measurements revealed the CaWO4:Dy3+ particles belong to the tetragonal scheelite phase with I41/a (#88) space group. The emission arising mainly from the 4F9/26H15/2 (blue) and 6H13/2 (yellow) transitions are corresponding to the 488 and 575 nm, respectively (Fig.). At lower doping concentrations the broad band (~420 nm) is due to the WO4 group emission. Increasing the RE3+ doping concentration the main emission lines transitions of the Dy3+ are enhanced. After heating, the 1.0 mol% Dy3+ doped material exhibit a better whitish emission due to the simultaneous presence of broad band of the host in blue region and emission lines at longer wavelengths (Fig.). The lifetimes decrease monotonously in function of the Dy3+ concentration which indicates that the energy transfer from host to the Dy3+ becomes more efficient. These results suggest that CaWO4:Dy3+ could act as a white emitting phosphor in solid state-lighting technology.

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  • IPEN-DOC 26960

    BARBOSA, HELLIOMAR P.; SILVA, IVAN G.N.; FELINTO, MARIA C.F.C. ; TEOTONIO, ERCULES E.S.; MALTA, OSCAR L.; BRITO, HERMI F.. White light emission materials based on simultaneous Tb3+, Eu3+ and Dy3+ doping in CaWO4 single-phased. In: WORLD CHEMISTRY CONGRESS, 46th; ANNUAL MEETING OF THE BRAZILIAN CHEMICAL SOCIETY, 40th; IUPAC GENERAL ASSEMBLY, 49th, July 07-14, 2017, São Paulo, SP. Abstract... Durham, NC, USA: International Union of Pure and Applied Chemistry, 2017.

    Abstract: Tungstates activated by trivalent rare earth ions (RE3+) can be used for many optical devices [1]. Over the last decades, the solid-state lighting sources based on phosphor converted white lightemitting diodes (pc-WLEDs) has improved to overtake fluorescent lighting types because of many advantages such as high ecofriendliness, brightness, low power consumption and fast response time [2]. Here we report preparation and spectroscopic properties of the single phase new highly luminescent white emitting of the Tb3+/Eu3+/Dy3+ triply-doped CaWO4 material. The CaWO4:xTb3+,xEu3+,xDy3+(x mol% of the Ca2+ amount) materials were prepared by fast coprecipitation method at room temperature with stoichiometry aqueous solutions of Na2WO4, CaCl2 and RECl3 (RE3+: Tb, Eu and Dy). The XPD measurements revealed the CaWO4:RE3+ particles belong to the tetragonal scheelite phase with I41/a (#88) space group. The emission spectra exhibit only narrow emission bands arising from the doping Tb3+, Dy3+ and Eu3+ ions. These emission bands are assigned to the 4f transitions from the 4F9/2 (Dy3+), 5D4 (Tb3+) and 5D0 (Eu3+) emitting states to their energy levels corresponding to (in nm): 702 5D07F4(Eu3+), 655 5D07F3(Eu3+), 615 5D07F2(Eu3+), 592 5D07F1(Eu3+), 575 4F9/26H13/2(Dy3+), 544 5D47F5(Tb3+), 488 5D47F6(Tb3+), 478 4F9/26H15/2(Dy3+) (Fig. left). The presence of the emission bands assigned to the doping Dy3+, Tb3+ and Eu3+ ions suggests clear evidence of nonradiative energy transfer from 4F9/2 (Dy3+)5D4 (Tb3+)5D0 (Eu3+) emitter states (Fig. center). The white light emission was mainly reached for 5.0 mol% RE3+ with x: 0.333; y: 0.352 CIE (Commission Internationale l'Éclairage) coordinates (Fig. right). These phosphors could be suitable as triply-doped white light emitters with only single-phased for solid state lighting applications. Since warm white light is preferred for reading, while cold white light is preferred for public lighting the tunability of this single-phase emitting phosphor exhibit promising applications for solid-state lighting.

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  • IPEN-DOC 24671

    PIERETTI, EURICO F. ; COZZA, RONALDO C.; NEVES, MAURICIO D.M. das . Wear evaluation of the ASTM F138 austenitic stainless steel for biomedical applications treated by optical fiber laser. In: WORLD TRIBOLOGY CONGRESS, 6th, September 17-22, 2017, Beijing, China. Resumo expandido... 2017. p. 1-4.

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  • IPEN-DOC 24432

    CAREZZATO, G.L. ; COUTO, C.P. ; ROSSI, J.L. ; MARTINEZ, L.G. ; TURRILLAS, X.. A versatile setup in reflection mode for in situ diffraction patterns acquisition from flat polycrystalline specimens bathed in a liquid medium. In: RAU ANNUAL USERS MEETING LNLS/CNPEM, November 22-24, 2017, Campinas, SP. Abstract... 2017. p. 50-50.

    Abstract: A cell to perform in situ diffraction measurements of specimens regularly immersed in a liquid medium has been developed. The assembly (see Fig. 1) has been adapted to work in beamline XRD2 in reflection mode. Basically consists of a polypropylene box with two windows made of poliimide to allow the passage of X-rays (incident and diffracted) at lower angles. The flat sample is placed in the middle of the box that is on top of the goniometer head. For safety reasons the central box is positioned over a tray to avoid spillage of liquid. On the bottom of the cell there is a connection to the pipe linked to the syringe. The syringe is driven by a beamline stepping motor. This way it is easy to synchronise the filling and evacuation of liquid from the cell with the actual data acquisition of diffraction patterns. The idea is to soak the flat specimen with the liquid and then remove it to acquire the diffraction data. This can be done in a sequential way for several hours to monitor the crystalline phases present on the surface (or rather a few microns deep) of the flat specimen. Various reactions can be investigated this way, provided that the sample is flat. Ceramics, metals, and polymers in contact with liquids could be studied. Preliminary tests have been performed in two theta – theta geometry on metal plates in contact with acid solutions to simulate accelerated corrosion. However a large variety of experiments with other geometries, (grazing incidence) could be carried out and of course this assembly could be used on SIRIUS with better time resolution.

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  • IPEN-DOC 24606

    TEIXEIRA, L.F.L. ; MAZZILLI, B.P. ; NISTI, M.B. ; SAUEIA, C.H.R. . Validation of uranium and thorium determination in sediments by spectrophotometry with Arsenazo III. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 84-84.

    Abstract: The evaluation of environmental contamination is one of the most important ways to check the anthropogenic interference. Human activities next to a water body, as mining, or on the waterbody, such as transportation ships, can pour unwanted wastes, increasing the concentration of metals or radionuclides. One way to evaluate this contamination on waterbodies is the quantification of radionuclides on sediments. The evaluation of uranium and thorium contamination is an important measurement of anthropogenic interference, because these two natural radionuclides can be found in many places on earth. The are many techniques to determinate the uranium and thorium concentration in sediments samples, and the spectrophotometric method with Arsenazo III is one of the quicker and cheaper method. The Arsenazo-III reacts with both radionuclides, producing a stable complex in low pH condition. The radionuclides were extracted from the sediments samples by an acid digestion, with HNO3, HF and H2O2, on a microwave. The interferences were removed by solvent extraction process, allowing the Arsenazo III react only with the uranium and thorium. The validation process was performed to evaluate if the whole process could reach reliable results with expected quality level. The Limit of Detection (LOD), Limit of Quantification (LOQ), Accuracy (Z-Score) and Precision (Relative Standard Deviation) of each method were evaluated following the INMETRO’s guidance document. The LOD and LOQ of the uranium determination are, respectively, 0.98 and 1.11 ppm, and for thorium determination are, 0.61 and 0.81 ppm, for the analysis of 0.5g of sediments samples. The methods validations were performed using the certified reference material (CRM) IAEA SL-1, for uranium determination, and IAEA SL-3, for thorium determination. Both validations reached satisfactory results of Accuracy and Precision for the analysis of 0.5g of sediments samples.

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  • IPEN-DOC 24255

    PERINI, ANA P.; MENDONÇA, DALILA S.C.; NEVES, LUCIO P.; SANTOS, WILLIAM de S.; BELINATO, WALMIR; CALDAS, LINDA V.E. . Uso do código de Monte Carlo MCNP para caracterização de uma câmara de ionização tipo lápis. In: CONGRESSO BRASILEIRO DE METROLOGIA, 9.; CONGRESSO INTERNACIONAL DE METROLOGIA MECANICA, 4.; CONGRESSO INTERNACIONAL DE METROLOGIA ELETRICA, 12.; CONGRESSO BRASILEIRO DE METROLOGIA DAS RADIAÇOES IONIZANTES, 4.; WORKSHOP DA REDE DE METROLOGIA QUIMICA DO INMETRO, 3.; CONGRESSO BRASILEIRO DE METROLOGIA OPTICA, 2., 26-29 de novembro, 2017, Fortaleza, CE. Resumo... Rio de Janeiro, RJ: Sociedade Brasileira de Metrologia, 2017. p. 65-65.

    Palavras-Chave: monte carlo method; ionization chambers; computerized simulation; dosimetry; dimensions; x radiation; configuration; pvc; brazilian cnen

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  • IPEN-DOC 24633

    MENDONCA, DIEGO E. de O. ; FANTINATI, MARCELO S.; FANTINATI, ADRIANA M.M.; SANTOS, BRUNO F.; REIS, JULIANA C.O.; BARBOSA, DEYSE A.; ARAUJO, LORRANE C.; LINO JUNIOR, RUY S.; RIBEIRO, MARTHA S. . Uso de terapia com luz de baixa potência para aceleração da cicatrização de queimaduras nas fases subaguda e crônica em ratos wistar com diabetes. In: ANAIS DA SOCIEDADE BRASILEIRA DE BIOCIENCIAS NUCLEARES, 09-11 de outubro, 2017, São Paulo, SP. Resumo... Rio de Janeiro, RJ: Sociedade Brasileira de Biociências Nucleares, 2017. p. 99-100.

    Abstract: Introdução: Pacientes com Diabetes Mellitus têm dificuldades na cicatrização de feridas, por defeito na deposição de colágeno ou diminuição na síntese de fatores de crescimento. Devido a grande dificuldade de cicatrização, vários tipos de procedimentos são utilizados no tratamento desses pacientes, como o uso de alginatos de cálcio, solução fisiológica 0,9% e sulfadiazina de prata. A Terapia com Luz de Baixa Potência (TLBP) tem mostrado bons resultados para aceleração de reparo cutâneo, no entanto, poucos estudos exploram seus efeitos biológicos. Objetivos: Avaliar a utilização da TLBP na aceleração da cicatrização de queimaduras nas fases subaguda e crônica em ratos Wistar com diabetes por análise histomorfométrica. Métodos: Projeto aprovado pela CEUA-UFG (007/2012.100). Os animais, uma vez induzidos a diabetes com estreptozotocina e após anestesia com quetamina 10% e xilazina 2% intraperitoneal, foram submetidos à queimadura por escaldo com água quente acima de 96°C por 14 s para indução de queimaduras de 3°grau. 30 animais foram aleatoriamente distribuídos em 2 grupos, grupo controle sem irradiação e grupo tratado. O grupo tratado foi irradiado com um laser de baixa potência (LASERMED 4098®, Carci, São Paulo, SP) com emissor GaAlAs =650 nm, potência 12 mW, área do spot 0,1 cm², irradiância 0,3 J e tempo 50 s. Para o tratamento, a área da queimadura era dividida em quatro quadrantes irradiados no modo pontual fluência de 6 J/cm², resultando em 24 J/cm² por sessão, totalizando 3 sessões/semana em dias alternados. Os animais receberam trocas com curativos oclusivos embebidos com sulfadiazina de prata e tiveram acompanhamento quanto aos aspectos histológicos ao longo de 14, 21 e 30 dias, na análise histológica dos processos patológicos utilizou se a coloração por hematoxilina e eosina, já para a quantificação de colágeno foi realizada a coloração por picro- sírius. Os processos patológicos gerais descritos foram: necrose, infiltrado inflamatório de polimorfonucleares, infiltrado inflamatório de mononucleares, hiperemia, hemorragia, neoangiogênese, fibrina, fibroblastos, colágeno e reepitelização. Estes foram classificadas de forma semi- quantitativa, seguindo os seguintes critérios: ausente, discreta (com comprometimento de até 25% da área), moderada (26 a 50%) e acentuada (acima de 50%). Para a análise estatística utilizou-se o “teste t’’ paramétrico e resultados significativos quando p < 0, 05. Resultados: Os resultados obtidos para a neoângiogenes nos grupos controle e tratamento foram moderado (2,0±0,0) e acentuado (3,0±0), respectivamente o que foi estatisticamente significante no grupo tratado em relação ao controle ao 14° dia (p<0, 05). A presença de fibroblastos no 14°dia no grupo controle era moderado (2,6±0,5) na maioria das vezes e no grupo tratado era acentuado (3,0±0), no 21° dia era ausente no grupo controle e no tratado acentuada (3,0±0), assim o número de fibroblasto foram estatisticamente significantes no grupo tratado em relação ao controle (p<0,05). No grupo controle a quantificação de colágeno foi de 10,2(9,18–12,50) no 14° dia; 10,11(9,06- 12,50) no 21° dia e 10,2 (9,57-14,00) no 30° dia. No grupo tratado a quantificação de colágeno foi de 12,5 (11,33-13,61) no 14° dia; 13,5 (11,53-16,40) no 21° dia e 14,2 (13,45-15,31) no 30° dia, assim houve maior deposição de colágenos ao longo do 14°, 21° e 30° dia no grupo irradiado comparados ao controle (p <0,01). Conclusão: O tratamento reduziu a ferida ao longo do tempo, estimulando a neoangiogênese, aumento de fibroblastos e maior deposição de colágenos.

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  • IPEN-DOC 23245

    CORDEIRO, THIAGO da S. ; MATOS, RICARDO A. de; VIEIRA JUNIOR, NILSON D. ; COURROL, LILIA C.; ROSSI, WAGNER de ; SAMAD, RICARDO E. . Using lasers, genetic algorithms and microfluidic devices to modify silver nanoparticles. In: INTERNATIONAL CONFERENCE OF NANOPHOTONICS, 10th, July 02-05, 2017, Recife, PE. Abstract... 2017. p. 32-32.

    Abstract: This work presents a technique to control silver nanoparticles dimensions using a femtosecond laser, a microfluidic device and a genetic algorithm. The importance of this technique is related to its interdisciplinarity and potential to actively control the nanoparticles dimensions and geometries.

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  • IPEN-DOC 26949

    SOUZA, S.R.B. ; COSTA, D. ; NUNES, R.M. ; ORTIZ, N. . Using charcoal micronized carbon (MEC) to methylene blue adsorption: the isotherm calculations. In: IWA LEADING EDGE CONFERENCE ON WATER AND WASTEWATER TECHNOLOGIES, 14th, May 29 - June 02, 2017, Florianópolis, SC. Resumo expandido... London, UK: International Water Association, 2017.

    Abstract: A comparison of different isotherm calculations was performed using micronized eucalyptus charcoal (MEC) absorbing methylene blue. The dye wastewater could affect in large scale the surface water quality and the metabolism of many species. The micronized charcoal was able to remove about 75% for the dye accordingly with Langmuir, Freundlich and Redlich-Peterson isotherm calculations suggesting a promising new, efficient and low cost water treatment process.

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  • IPEN-DOC 26894

    NEGRAO, BIANCA ; VILLAVICENCIO, ANNA L.C.H. . Use of medium and high doses of ionizing radiation in cassava starch. In: SIMPÓSIO LATINO AMERICANO DE CIÊNCIA DE ALIMENTOS, 12th, November 4-7, 2017, Campinas, SP. Abstract... Campinas, SP: Galoá, 2017.

    Abstract: Cassava starch is susceptible to microbial changes, which can affect its shelf life. Ionizing radiation is used in doses sufficient to reduce microorganisms. However, when being exposed to starch granule it can cause changes in structure when compared to other methods. The aim of the work was to irradiate starches with medium and high doses in order to observe the effects on color of cassava starch and texture of tapioca. The starch samples were purchased in supermarkets in two types: starches with preservative (Fc – sodium metabisulphite) and starch without preservative (Fs). They were then irradiated at doses of 0, 5, 10 and 15 kGy in a 60Co Gamma cell 220 with dose rate of 0.764kGy/h-1. Subsequently, the samples were evaluated on 1st, 15th and 30th day after irradiation. The results show that in relation to the tonality (h°) there was a significant difference (P> 0.05) between the control and the irradiated samples on the 30th day. It's worth mentioning that, Fc and Fs had similar behavior at dose of 10 kGy, showing averages nearly h= 90º (Fs: 90.6±0,4; 90.0±0,3; 90.4±0,50 and Fc: 90.5±0,3; 89.9±1,6; 89,5±2,9 on the 1st, 15th and 30th day, respectively) indicating that the samples turned yellowed according to storage days. This tendency towards the yellow color can be attributed to the modification of reactions of the starch monosaccharide’s. The radiation can influence the rupture of surface the starch. For this reason, the tapioca showed increase in hardness (N) according to the increase of radiation dose as well as with storage days. However, on the 30th day, Fc showed no significant difference between doses of 5kGy (10.06); 10kGy (11.44) and 15kGy (11.67). The analysis of the results allows concluding that in this product it's possible use doses up to 10kGy because not change considerably the parameters studied.

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  • IPEN-DOC 24548

    OLIVEIRA, J.A.S. ; SILVA, P.S.C. . Use of macrophites for removal of metals in liquid effluents, using instrumental neutron activation analysis. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 30-31.

    Abstract: This study proposes the application of Eichhornia crassipes biomass, abundant in the dams of São Paulo state, to remove metallic ions from solution, aiming its application to effluent treatment. The efficiency of adsorption was tested by the Zn, Fe, Cr, Co removal from solutions containing these elements. The plants, for biomass production, were collected at the Billings reservoir in São Bernardo do Campo, located in the Southeast of São Paulo Metropolitan Region. After collection, the plants were washed and dried in a ventilated oven from 60 C to 70 C, crushed and passed through a 150 m sieve. The biomass thus obtained was subjected to the chemical activation process by the treatment with 0.1 mol L􀀀1 solution of HCl and 0.1 mol 􀀀1 of NaOH in order to increase its surface area. The tests indicated that the treatment with HCl was the most effective and this was used in the preparation of the biomass for the adsorption tests of the metallic ions. The adsorption tests were carried out, at first, to verify the effect of the pH and the contact time between the sample and the adsorbent in the adsorption process. The concentrations of Zn, Fe, Cr and Co, present in the solution, before and after the treatment, were determined by the instrumental neutron activation analysis (INAA) technique. For this determination the samples were irradiated for 8 hours at the IEA-R1 reactor at IPEN. The concentrations were determined by comparing the peak area of the samples and that of the reference materials irradiated together with the samples.

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  • IPEN-DOC 24550

    SANTOS, L.A.B. ; SHIGASI, A. ; DAMATTO, S.R. . Use of INAA technique in mineral water samples from the Parque das Águas of Cambuquira and Marimbeiro. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 32-32.

    Abstract: Water is an indispensable molecule for the existence of life, thus several studies analyze both their chemical composition and biological and radiological. There is a greater concern about mineral waters, since they tend to be consumed even as a therapeutic form, originating the study of crenotherapy. Currently there are several analytical techniques for the determination of elements in water and one that can be used is the neutron activation analysis, which consists of a technique that forms radioactive isotopes by means of reactions that occur in the nucleus of the atoms, thus allowing simultaneous determination of various chemical element concentrations. In addition to being a sensitive and reliable method, it is free of sample destruction. The method can be used either in samples in their solid or liquid form. The mineral water, according to Decree Law No. 7.841 of 08.08.1945 is defined as: "Mineral waters are those from natural or artificially collected sources that have chemical composition or physical or physico-chemical properties distinct from common waters with characteristics that give them a medication action". In addition to chemical composition, these waters may be classified by other physical chemical characteristics, such as temperature and gases; they are also studied in the field of medicine. The objective of this study was to determine the concentration of the elements As, Ba, Br, Ca, Ce, Co, Cr, Cs, Eu, Fe, Hf, K, La, Lu, Na, Nd, Rb, Sb, Sc, Se, Sm, Ta, Tb, Th, U, Yb and Zn in the mineral waters from Parque das Águas of Cambuquira, springs Gasosa I, II and III, Férrea, Magnesiana, Litinada and Marimbeiro springs 1, 2 and 3, both parks located in the city of Cambuquira, MG. Parque das Águas of Marimbeiro is located 3km from the center of the city of Cambuquira; the parks are managed by the CODEMIG. A sample of a mineral water spring was also collected from a private property open to the population, near to the park of Cambuquira and called the spring of Laranjal or Dico. The samples for the autumn sampling of 2016 were analyzed, for which the results obtained showed that in the mineral waters of the parks Cambuquira and Marimbeiro was determined the elements Na and Ca, which are expected elements since an important characteristic of fresh waters is that they have an identity of the inorganic ions. This characteristic may be linked to the salts of these ions being moderately soluble, thus facilitating their mobilization in aqueous medium. Also determined in the waters were the elements Zn, Co, Fe and rare earth elements such as Sm and La.

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  • IPEN-DOC 24267

    DAMIANI, RENATA; FEITOSA, THAIS; DAKIC, VANJA; SILVA, JOSEMAR; CUNHA, TATIANA; NORONHA, MARCOS; HIGA, OLGA ; ALEPEE, NATHALIE; PELLEVOISIN, CHRISTIAN; BACELLAR, MARIANO; BALOTTIN, LUCIENE; VECCHI, RODRIGO de; MEDEIROS, FABIANA . Use of in vitro methods according to OECD GD 129 and OECD TG 439 to classify children′s articles aligned with the UN GHS principles. In: WORLD CONGRESS ALTERNATIVES AND ANIMAL USE IN THE LIFE SCIENCES, 10th, August 20-24, 2017, Seattle, Washington, USA. Abstract... 2017.

    Abstract: Alternative Methods Network (RENAMA), National Institute of Metrology, Quality and Technology (INMETRO), Rio de Janeiro, Brazil, 4Schools Articles Safety Brazilian Technical Committee (CEE 102), Brazilian Association of Technical Standards (ABNT), São Paulo, Brazil, 5Biotechnology Department, Nuclear and Energy Research Institute (IPEN/CNEN-SP), São Paulo, Brazil, 6Research and Innovation, L’Oréal Research and Innovation, Aulnay-sous-bois, France, 7Research and Innovation, Episkin Academy, Lyon, France Schools Articles Safety Brazilian Technical Committee (TC/ABNT CEE 102) has taken up the challenge to update the national safety standard ABNT NBR 15236:2016 that complies with the regulations and guidelines on alternatives testing. The current aim was to provide an in vitro strategy for risk assessment of school articles with data integration following OECD GD129 & TG439. In Vitro Acute Toxicity and SkinEthicTM Reconstructed Human Epidermis Skin Irritation methods were adapted from medical devices protocols by measuring cytotoxic effects of extracts prepared according ISO10993. Results obtained on >150 school articles (pens, pencils, crayons, watercolor, adhesives, correction fluid) were reproducible. 100% concordance with UN GHS classification for discriminating approval (95%) versus non-approval (5%) was observed. In conclusion, these results are important to ensure that regulatory authorities in Brazil are provided with the appropriate data required for decision-making.

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  • IPEN-DOC 24594

    SARKIS, J.E.S. ; MARIN, R.C. . Uranium isotope ratio measurements by LA-HR-ICP-MS. In: 60 YEARS OF IEA-R1: INTERNATIONAL WORKSHOP ON UTILIZATION OF RESEARCH REACTORS, November 28 - December 01, 2017, São Paulo, SP. Abstract... São Paulo, SP: Instituto de Pesquisas Energéticas e Nucleares, 2017. p. 71-72.

    Abstract: This work describes the utilization of LA-HR-ICP-MS (laser ablation high resolution inductively mass spectrometry) for characterize the uranium isotope ratio of a UO2 pellet supplied and certified by New Brunswick Laboratory (NBL). This method is useful measurements of 233U, 234U, 235U, 236U and 238U, reaching relative standard deviations (RSD) from 1.55% to 2.45%. The Laser ablation ICP-MS technique shows a high level of instability, compromising the precision of the measurements, although could be made some adjustments to improve its stability. To reach the better stability were made the adjustments of laser ablation and ICP-MS parameters, such as RF power, laser beam diameter, defocusing of laser beam, auxiliary gas and sample gas. The parameters which caused the greatest impact in order to improve the stability signal were RF power, defocusing and laser beam diameter. To carry out the adjustments of the parameters was used a glass standard NIST 610, supplied and certified by National Institute of Standards and Technology (NIST). The measurements were carried out on a single spot ablation with low energy density and defocusing, which demonstrated to be the improved way to reach good signal stability. The results presented by the measurements revealed that the Laser ablation ICP-MS technique offers a rapid and accurate way to perform uranium isotope ratios without any sample preparation, since it allows carrying out the measurements straight on the sample, besides to preserve the sample that is very important to safeguards and nuclear forensics.

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  • IPEN-DOC 24635

    SILVA, EVELIN C. da ; BELLINI, MARIA H. . Upregulation of peroxideroxin-6 in human renal adenocarcinoma cells 786-0, after ionizing radiation. In: ANAIS DA SOCIEDADE BRASILEIRA DE BIOCIENCIAS NUCLEARES, 09-11 de outubro, 2017, São Paulo, SP. Abstract... Rio de Janeiro, RJ: Sociedade Brasileira de Biociências Nucleares, 2017. p. 114-114.

    Abstract: Introduction: Renal cell carcinoma (RCC) accounts for 3% of human malignancies and approximately 90% of renal malignancies and among urological tumors. RCC is quite resistant to conventional radiotherapy. This technique allows the dose of radiation, in a single fraction, to be precisely applied to the tumor and the tissues adjacent to it, most of the time, are spared. Proteomics has allowed large-scale studies of protein expression in different tissues and body fluids, under different conditions and / or times. Mass spectrometry allows the identification and quantification of thousands of proteins and peptides in a biological fluid or lysed cells, and is analyzed on a platform to identify differences in the expression of proteins associated with cancer cell proliferation and to establish potential biomarkers predictive of the response therapy. The peroxideroxin- 6 (PRDX 6) protein encoded by this gene is a member of the antioxidant protein family. The PRDX family contains six members that function in detoxifying ROS and providing cytoprotection from internal and It may play a role in the regulation of phospholipid turnover as well as in protection against oxidative injury. Aim: To analyze the expression of PRDX6 in 786-0 cells, after radiation. Methods: A cell culture of the 786-0 cells was performed and to evaluate the mitotic potential, the clonogenic assay was performed with doses of 2 to 10 Gy irradiated in GammaCell (CTR, IPEN) and incubated for 10 days in normoxia conditions. After 10 days, the colonies of the respective doses were stained with methanol 20% and crystal violet 0,5% and counted, and the multiple comparisons was analized by One-way ANOVA followed by Bonferroni´s test and at the defined dose the cells were irradiated and the cytoplasmic proteins were extracted by the PE kit Subcellular proteome extraction (Merck, USA), dosed by the Lowry method and stored at -20º. For the qualitative analysis of proteins, SDS-PAGE was performed with 50ug of protein and the protein band obtained was digested and analyzed by nanoUPLC tandem nanoESI-MSE mass spectrometry in the LNBio laboratory in Campinas-SP. The generated result was analyzed by MASCOT server for peptides searchs and quantitatively analized by scaffoldTM 4.6 software. Results: After the clonogenic assay was performed, 8 Gy was defined as the dose for cell irradiation, an average protein yield of 786-0 non-irradiated 2,59± 0,07 mg/mL and 786-0 irradiated with 3,13± 0,67 mg/mL was obtained. Mass spectrometry revealed the presence of the PRDX6 protein with a 95% coverage and a fold-change of 3.1 compared to the non-irradiated group. Conclusion: The overexpression of PRDX6 after radiation, suggests a potential role for PRDX6 in protection against oxidative stress and a radioresistance to renal cells,

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  • IPEN-DOC 24514

    SILVA, F.R.O. ; LIMA, N.B. ; BRESSIANI, A.H.A. ; GOMES, L. . Upconversion luminescence of Yb3+: Tm3+ and Yb3+: Tm3+: Er3+- doped Beta-Tricalcium Phosphate nanoparticles. In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 18th, August 27 - September 01, 2017, João Pessoa, PB. Abstract... 2017. p. 336-336.

    Abstract: A novel class of fluorescence nanoparticles of 5.5 mol% of Yb3+, 0.5 mol% of Er3+ and 0.5 mol% Tm3+: calcium deficient hydroxyapatite were synthesized by co-precipitation method in aqueous solution (pH adjusted to 6) and specially treated with microwave radiation at 1000°C for 10 minutes to produce nanocrystals of Yb:Tm: and Yb:Tm:Er:-tricalcium phosphate (-TCP). As a result, we report for the first time, a single-phase -TCP:Yb:Tm:Er and -TCP:Yb:Tm exhibiting an efficient visible and near infrared upconversion luminescence from the 1G4 (blue emission), 4S3/2 (green emission), 3F2 (red emission) and 3H4 (near infrared emission) induced by the Yb3+ Tm3+ / Er3+ energy transfer under pulsed laser excitation at 972 nm (Yb3+) with an average energy of 11 mJ. The emission decay curves of the upconversion transients, from 1G4 excited state of Tm3+ and 4S3/2 excited level of Er3+, indicate that ESA process occurs in -TCP:Yb/Tm/Er nanopowder measured for the 550 nm luminescence of Er3+, which has a time constant (t2) of 0.4 s. However, Yb3+  Tm3+ upconversion (Up2) has a time constant (t2) of 14.4 s and does not exhibit ESA absorption. This -TCP activated by Yb3+ and Tm3+ ions constitutes a new nanobiomaterial that can be used as diagnostic and therapeutic agents, affording deeper tissue penetration and higher resolution and sensitivity for visible-near infrared bioimaging and treatments.

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  • IPEN-DOC 24456

    SANTANA, LUCIANA V. de; COTRIM, MARYCEL E.B. ; SAID, DAPHNE de S.; ULRICH, JOAO C. ; PIRES, MARIA A.F. . Uncertainty estimation for the determination of uranium by titrimetric method Davies & Gray. In: CONGRESSO BRASILEIRO DE METROLOGIA, 9.; CONGRESSO INTERNACIONAL DE METROLOGIA MECANICA, 4.; CONGRESSO INTERNACIONAL DE METROLOGIA ELETRICA, 12.; CONGRESSO BRASILEIRO DE METROLOGIA DAS RADIAÇOES IONIZANTES, 4.; WORKSHOP DA REDE DE METROLOGIA QUIMICA DO INMETRO, 3.; CONGRESSO BRASILEIRO DE METROLOGIA OPTICA, 2., 26-29 de novembro, 2017, Fortaleza, CE. Resumo... Rio de Janeiro, RJ: Sociedade Brasileira de Metrologia, 2017. p. 102-102.

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  • IPEN-DOC 24516

    ANTONIO, P.L. ; GRONCHI, C.C.; PINTO, T.C.N.O.; CALDAS, L.V.E. . Ultraviolet radiation for the induction of PTOSL in CaSO4:Dy detectors. In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 18th, August 27 - September 01, 2017, João Pessoa, PB. Abstract... 2017. p. 355-355.

    Abstract: The application of artificial sources of ultraviolet radiation (UVR) in various areas such as industry, medicine, dentistry and in research is increasing due to the technological advances of the last decades. This fact may cause health risks to workers if appropriate protection measurements were not adopted. The International Commission on Non-Radiation Protection (ICNIRP) recommends exposure limits to non-ionizing radiation. UVR measuring electronic instruments are expensive, and the use of dosimetric material is a good option for UV dosimetry. The phototransferred optically stimulated luminescence (PTOSL) was already shown to be a useful technique for UVR detection using Al2O3:C Landauer dosimeters. The PTOSL phenomenon involves the production of optically stimulated luminescence (OSL) by the phototransfer of charges to empty traps from deeper, filled traps. Thus, by filling the deeper traps of the detector with a pre-dose of ionizing radiation, and submitting the samples subsequently to an adequate thermal treatment to remove any trapped charge from the shallow (dosimetric) traps, charge can be transferred from the deep traps to the shallow traps by exposing the sample to UVR wavelengths. CaSO4:Dy+Teflon pellets produced at IPEN were used in this study. The PTOSL measurements were taken in an OSL reader system Risø, model TL/OSL-DA-20. The UV illumination procedures were performed in a system with a high-pressure mercury lamp. The CaSO4:Dy+Teflon samples were initially characterized in order to verify their reproducibility of OSL response and the variation of response in relation to the absorbed dose, using high doses of a 60Co source. The objective of this study is to characterize the material in terms of its luminescent properties. After this initial step, the samples were: pre-irradiated with a high dose; thermally treated; exposed to the UV source with different wavelengths; finally, the PTOSL responses were taken. The results were satisfactory and showed that the CaSO4:Dy samples present PTOSL response in function of the tested parameters, such as UV wavelength and irradiance.

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  • IPEN-DOC 24509

    COSTA, I.F.; MOURA, J.L.; ADENES, R.E.; BRITO, H.F.; FELINTO, M.C.F.C. ; FAUSTINO, W.M.; CREMONA, M.; TEOTONIO, E.E.S.. Tuning colors in novel electroluminescent devices based on Al-indandionate complexes. In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 18th, August 27 - September 01, 2017, João Pessoa, PB. Abstract... 2017. p. 262-262.

    Abstract: In the past years, the development of materials for organic light-emitting diodes (OLEDs) have attracted much attentions [1]. In this sense, the present work reports about syntheses, characterization, Photo (PL) - and electroluminescence (EL) properties of Al-indandionate complexes of formula [Al(aind)3], where aind: 2-acetyl-1,3-indandionate (acind), 2-benzoyl-1,3-indandionate (bind) or 2-(4-methyl)benzoyl-1,3-indandionate (mbind). These complexes were characterized by elemental analyses, Fourier-infrared absorption spectroscopy, thermogravimetric analyses and 1H-NMR. Photoluminescent spectra of the complexes in both powder and thin film exhibited overlapped broad bands associated to both fluorescence and phosphorescence (see time-resolved spectra, Fig. 1a) phenomena. The electroluminescent devices of configuration ITO/β-NPB/Al(aind)3/LiF/Al (1) exhibited emission in the red spectral region associated to electrophosphorescence (figure 1.b). On the other hand, the three layers devices of configuration ITO/β-NPB/spiro-2CBP/Al(aind)3/Al (2) showed an intensity band in green spectral region (figure 1.b). The OLEDs presented emission from low voltage (~8V), reaching the highest intensity around 16 V. According to these results, the Al-indandionate complexes act as both efficient electron transporters and emitting layers. In addition, these data suggest that TADF process is operative in the bilayer devices.

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  • IPEN-DOC 24264

    SILVA, F.D. ; SEVILHANO, T.C.A. ; FREIRE, R.P. ; SUZUKI, M.F. ; OLIVEIRA, J.E. ; PERONI, C.N. ; RIBELA, M.T.C.P. ; BARTOLINI, P. ; SOARES, C.R.J. . Transient expression of recombinant human prolactin and thyrotropin in human embryonic kidney (Expi293FTM) suspension cells. In: CONFERENCE ON PROTEIN EXPRESSION IN ANIMAL CELLS, 13th, September 24-28, 2017, Valencia, Spain. Abstract... 2017.

    Abstract: Human prolactin (hPRL) and human thyrotropin (hTSH) are pituitary polypeptide hormones with key functions in the physiological regulation of the human body. hPRL is highly secreted during lactation, has important action in reproduction and for immunoregulation, among other functions. hTSH is related to the control of thyroid gland. The Chinese Hamster Ovary (CHO) and Human Embryonic Kidney (HEK293) cells are the most used hosts for expression of recombinant human proteins because they can be easily cultured in suspension conditions, and express high levels of proteins that have a relative similarity in post-translational modifications compared to their human counterparts. Our laboratory has experience in the synthesis of these proteins in the Escherichia coli periplasm (hPRL), adhered CHO (hPRL and hTSH), suspension CHO (hPRL) and adhered HEK293T cells (hTSH). The aim of this work was to produce hPRL and hTSH in suspension Expi293FTM cells for their characterization. The hPRL and hTSH cDNA were introduced into the commercial plasmid pcDNATM 3.4-TOPO® and 30 μg of these plasmids were used to transfect 30 mL of suspension Expi293FTM cells (2.5 x 106 cells/mL) in a 125 mL erlenmeyer, using 81 μL of ExpiFectamineTM transfection agent. After 16 h of transfection, 150 μL of Enhancer 1 and 1.5 mL of Enhancer 2 were added and the culture was maintained in an incubator at 37 °C, 8% CO2, at 125 rpm in orbital shaker. Samples of conditioned media (Expi293TM expression medium) were collected during 4 days and stored at -80 °C. These were analyzed by SDS-PAGE, ELISA, Western blotting, and HPLC. For the first time, hPRL and hTSH, were transiently expressed in human (Expi293FTM) suspension cells, the expression levels reaching, on the 3rd day, 46 μg of hPRL/mL and 116 μg of hTSH/mL. These results show that the expression is clearly dependent on the characteristics of the protein and that this methodology is very efficient to obtain high levels of human glycoproteins in a short time and will allow us to purify them and compare their glycosylation profiles of these to CHO-derived and human native pituitary hormones.

    Palavras-Chave: hormones; embryos; kidneys; trh; animal cells; cho cells; lth

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O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.

A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

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2. A experiência do Instituto de Pesquisas Energéticas e Nucleares (IPEN-CNEN/SP) na criação de um Repositório Digital Institucional – RDI, clique aqui.

O Repositório Digital do IPEN é um equipamento institucional de acesso aberto, criado com o objetivo de reunir, preservar, disponibilizar e conferir maior visibilidade à Produção Científica publicada pelo Instituto, desde sua criação em 1956.

Operando, inicialmente como uma base de dados referencial o Repositório foi disponibilizado na atual plataforma, em junho de 2015. No Repositório está disponível o acesso ao conteúdo digital de artigos de periódicos, eventos, nacionais e internacionais, livros, capítulos, dissertações, teses e relatórios técnicos.

A elaboração do projeto do RI do IPEN foi iniciado em novembro de 2013, colocado em operação interna em julho de 2014 e disponibilizado na Internet em junho de 2015. Utiliza o software livre Dspace, desenvolvido pelo Massachusetts Institute of Technology (MIT). Para descrição dos metadados adota o padrão Dublin Core. É compatível com o Protocolo de Arquivos Abertos (OAI) permitindo interoperabilidade com repositórios de âmbito nacional e internacional.

O gerenciamento do Repositório está a cargo da Biblioteca do IPEN. Constam neste RI, até o presente momento 20.950 itens que tanto podem ser artigos de periódicos ou de eventos nacionais e internacionais, dissertações e teses, livros, capítulo de livros e relatórios técnicos. Para participar do RI-IPEN é necessário que pelo menos um dos autores tenha vínculo acadêmico ou funcional com o Instituto. Nesta primeira etapa de funcionamento do RI, a coleta das publicações é realizada periodicamente pela equipe da Biblioteca do IPEN, extraindo os dados das bases internacionais tais como a Web of Science, Scopus, INIS, SciElo além de verificar o Currículo Lattes. O RI-IPEN apresenta também um aspecto inovador no seu funcionamento. Por meio de metadados específicos ele está vinculado ao sistema de gerenciamento das atividades do Plano Diretor anual do IPEN (SIGEPI). Com o objetivo de fornecer dados numéricos para a elaboração dos indicadores da Produção Cientifica Institucional, disponibiliza uma tabela estatística registrando em tempo real a inserção de novos itens. Foi criado um metadado que contém um número único para cada integrante da comunidade científica do IPEN. Esse metadado se transformou em um filtro que ao ser acionado apresenta todos os trabalhos de um determinado autor independente das variáveis na forma de citação do seu nome.