Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: 

RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 21
Primeira ... 12 ... Última
Imagem não selecionada

Imprime registro no formato completo
Application of silver nanoparticles in food packages: a review Ciênc. Tecnol. Aliment.
SIMBINE,Emelda Orlando; RODRIGUES,Larissa da Cunha; LAPA-GUIMARÃES,Judite; KAMIMURA,Eliana Setsuko; CORASSIN,Carlos Humberto; OLIVEIRA,Carlos Augusto Fernandes de.
Abstract Silver nanoparticles (AgNPs) are antimicrobial agents that have a wide spectrum of action, including against pathogenic bacteria and spoilage fungi. However, their mechanism of action is not completely clarified. Nowadays, scientific interest on biological synthesis of AgNPs is growing, with emphasis in their extracellular biosynthesis by microbial cells, as it is the most reliable and ecologically correct method for production, yielding no toxic residues. AgNPs may be incorporated to biodegradable and non-biodegradable polymers for the production of food packages with antimicrobial properties, leading to greater safety and longer shelf life. However, it is important to carry out migration tests for new food packages incorporated with AgNPs, based...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Silver nanoparticles; Antimicrobial activity; Food packaging; Polymers.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612019000400793
Imagem não selecionada

Imprime registro no formato completo
Characterisation of Cassava Bagasse and Composites Prepared by Blending with Low-Density Polyethylene BABT
Farias,Fabiane Oliveira; Jasko,Ariana Crasnhak; Colman,Tiago André Denck; Pinheiro,Luís Antônio; Schnitzler,Egon; Barana,Ana Cláudia; Demiate,Ivo Mottin.
The main objective of this study was to characterise the cassava bagasse and to evaluate its addition in composites. Two cassava bagasse samples were characterised using physicochemical, thermal and microscopic techniques, and by obtaining their spectra in the mid-infrared region and analysing them by using x-ray diffraction. Utilising sorption isotherms, it was possible to establish the acceptable conditions of temperature and relative humidity for the storage of the cassava bagasse. The incorporation of cassava bagasse in a low-density polyethylene (LDP) matrix was positive, increasing the elasticity modulus values from 131.90 for LDP to 186.2 for 70% LDP with 30% SP bagasse. These results were encouraging because cassava bagasse could serve as a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Manihot esculenta Crantz; Residue; Polymers.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132014000600821
Imagem não selecionada

Imprime registro no formato completo
Color changes of wood from Pinus taeda and Schizolobium parahybum treated by in situ polymerization of methyl methacrylate using cross-linkers. Repositório Alice
MATTOS, B. D.; MISSIO, A. L.; CADEMARTORI, P. H. G. de; GATTO, D. A.; MAGALHAES, W. L. E..
The aim of this study was to evaluate the colorimetric properties of Pinus taeda and Schizolobium parahybum woods treated by in situ polymerization. The wood samples were impregnated in a vacuum/ pressure system and polymerized in an oven at 90°C for 10h, using benzoyl peroxide at 1,5wt% as the catalyst. The treatments were characterized using attenuated total reflectance infrared (ATRIR) spectroscopy and weight percentage gain (WPG). The color evaluation was performed using CIEL*a*b* concepts, specular gloss, and UV-Visible spectrophotometry. Treated woods showed increases in band intensity related to polymers (1730, 1460 and 1145 cm-1), and WPG ranged from 39 to 164%, depending of the wood species and treatments. Lightness decreased, while the Chroma,...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Schizolobium parahybum; Espécie exótica; Free radical polymerization; UV-Vis; Heat catalyst; Madeira; Tratamento; Espécie nativa; Pinus taeda; Wood treatment; Composites (materials); Polymers.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1043030
Imagem não selecionada

Imprime registro no formato completo
Contribution à l'étude du couplage entre diffusion d'eau et contrainte mécaniques dans les matériaux marins hautes performances ArchiMer
Humeau, Corentin.
The aim of the study was to understand the impact of coupling on water diffusion and mechanical stress on marine installations. Moreover, we identified the key phenomena involved during this type of exposure. When we look to these type of applications we can distinguish two type of materials used: one for the structure and another for mooring facilities. The best performing structural materials appear to be composites, while the most effective mooring devices are made with synthetic ropes. Therefore, we decided to investigate both materials with the same method: first the properties uncoupled, second, as semi-coupled behaviours and finally as one coupled phenomenon. The present work highlights the divergences between uncoupled, semi-coupled and coupled...
Tipo: Text Palavras-chave: Couplage; Diffusion d’eau; Contrainte mécanique; Vieillissement; Polymères; Cordages synthétiques; Composites; Coupling; Water diffusion; Mechanical stress; Ageing; Polymers; Synthetic ropes; Composites.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00499/61023/64424.pdf
Imagem não selecionada

Imprime registro no formato completo
Delamination behaviour of very high modulus carbon/epoxy marine composites ArchiMer
Baral, N; Davies, Peter; Baley, C; Bigourdan, Benoit.
This paper presents a study of the delamination resistance Of unidirectional carbon fibre reinforced epoxy composites manufactured from prepreg for racing yacht mast applications. Fibre modulus has been varied from 290 to 640 GPa. Two manufacturing methods, oven cure under vacuum and autoclave, were used to produce samples. Results show that delamination resistance tinder mode I and mixed mode loading decreases as fibre modulus increases. The manufacturing route affects G, values by modifying interlaminar layer geometry but does not change the trend of lower toughness with increasing fibre modulus. For the pitch composites crack propagation is observed within the fibres, in addition to more usual matrix and interface cracking. For the very high modulus...
Tipo: Text Palavras-chave: Mixed mode; Fracture toughness; Polymers; Carbon fibres; Delamination.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-3772.pdf
Imagem não selecionada

Imprime registro no formato completo
Digital micrometer used in thickness measurement of plastic film compared to standardized instrument. Repositório Alice
TEIXEIRA, C. E. F.; REBECHI, I. de A.; FONTANELI, R. S..
bitstream/item/166059/1/ID44159-2017v8p577MaterialsSciencesApplications.pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Plástico; Polymers.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1078812
Imagem não selecionada

Imprime registro no formato completo
Efecto de dosis de polimero maleico en la estabilidad estructural de suelos salinos. Repositório Alice
LOPES, P. R. C.; GISBERT, J.M.; GOMEZ, L.D.; OLIVEIRA, C.A..
1999
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Solo salino; Polimero maleico; Efeito; Saline soils; Polymers; Maleic; Effect; Salinidade; Solo; Soil.
Ano: 1999 URL: http://www.alice.cnptia.embrapa.br/handle/doc/133755
Imagem não selecionada

Imprime registro no formato completo
Effect of harvest timing and postharvest storage conditions on aflatoxin contamination in groundnuts harvested from the Wonogiri regency in Indonesia Open Agri
Rahmianna,A.A.
Palavras-chave: Mycotoxins; Groundnuts; ELISA; Polymers; Retail marketing; Sampling; Storage; Harvesting; Fungi; Quality.
Ano: 2007 URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3358
Imagem não selecionada

Imprime registro no formato completo
Effect of replacement of corn starch by whey protein isolate in biodegradable film blends obtained by extrusion. Repositório Alice
AZEVEDO, V. M.; BORGES, S. V.; MARCONCINI, J. M.; YOSHIDA, M. I.; SENA NETO, A. R.; PEREIRA, T. C.; PEREIRA, C. F. G..
bitstream/item/167883/1/P-Effect-of-Replacement-of-Corn-....pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Polymers; Blends; Extrusion; Thermal stability; Morphological properties.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1081142
Imagem não selecionada

Imprime registro no formato completo
Effect of xanthan on the growth of sulphate-reduction bacteria in marine sediments. ArchiMer
Battersby, N; Stewart, D; Sharma, A.
Chemical additives are used extensively in the offshore oil industry. For secondary oil recovery, the biopolymer xanthan has been recommended as a viscosifying agent but its use may provoke microbial problems. The effect of adding xanthan to marine sediments on the growth and metabolic activity of sulphate-reducing bacteria (SRB) was studied. In all instances, its addition resulted in an increasing in SRB numbers of up to 250-fold. This was accompanied by a marked increase in the electron transport activity of the sediments when these were incubated under either aerobic or anaerobic conditions. The products formed as a result of the biodegradation of the polymer by indigenous heterotrophic bacteria in these sediments appear to have acted as suitable...
Tipo: Text Palavras-chave: Bacteria; Growth; Additives; Pollution effects; Oil recovery; Biodegradation; Polymers; Sediment pollution; Sulfate reduction.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-1015.pdf
Imagem não selecionada

Imprime registro no formato completo
Experimental acrylonitrile butadiene styrene and polyamide evisceration implant: a rabbit clinical and histopathology study Arq. Bras. Med. Vet. Zootec.
Gomes Júnior,D.C.; Nassar,E.J.; Dórea Neto,F.A.; Lima,A.E.; Martins Filho,E.F.; Oriá,A.P..
ABSTRACT The purpose of this study was to evaluate acrylonitrile butadiene styrene (ABS) and polyamide implants in rabbits submitted to evisceration at the macroscopic and microstructure level and to assess clinical response and histopathological changes as well. For the experimental study implants of 12mm diameter were prepared by rapid prototyping, weighed and the outer and inner surfaces evaluated macroscopically and by electron microscopy. In addition, a compression test was performed and ultrastructural damage was then determined. After evisceration of the left eyeball, nine New Zealand rabbits received ABS implants and nine others received polyamide implants. The animals were assessed daily for 15 days after surgery and every seven days until the end...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Rabbits; Ocular prosthesis; Polymers.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352016000501168
Imagem não selecionada

Imprime registro no formato completo
Facility for Growing Plants in Test Tubes at ICRISAT Open Agri
O.P..
Palavras-chave: Rhizobium; Chickpeas; Pigeonpeas; Root nodulation; Temperature; Nitrogen fixation; Polymers; Iron; Tropical zones; Quality.
Ano: 1984 URL: http://agropedia.iitk.ac.in/openaccess/?q=node/4025
Imagem não selecionada

Imprime registro no formato completo
Flocculation of fine fluorite particles with Corynebacterium xerosis and commercial long chain polymers BJM
Rigo,Lisandra N.; Pinto,Angela Maria; Denardin,Norimar D'Avila; Schneider,Ivo André H..
This work aimed to study, comparatively, the flocculation of fluorite particles with Corynebacterium xerosis cells and three commercial long chain polymers. Best flocculation results were obtained with cells of C. xerosis and with an anionic polyacrylamide. Both were effective in solids removal and water clarification, although flocculation with C. xerosis cells requires a higher dosage of reagent per mass unit of processed ore.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Corynebacterium xerosis; Flocculation; Fluorite; Polymers.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822002000400010
Imagem não selecionada

Imprime registro no formato completo
Hidrogéis de colágeno e sulfato de condroitina com diferentes agentes reticulantes. Repositório Alice
OLIVEIRA, A. P. V..
A produção de pescado, especificamente, tilápia e camarão geram um enorme montante de resíduo com potencial para a agregação de valor. Uma alternativa para o aproveitamento integral do pescado é a extração de moléculas com características químicas e físicas adequadas para a formulação de microcápsulas e hidrogéis como base para o desenvolvimento de novos produtos inclusive na área de alimentos e biomédica. Dentre essas moléculas, o colágeno é a principal proteína estrutural no corpo, tem como função promover elasticidade e sustentação a pele, ossos, cartilagens e tendões. Glicosaminoglicanos são encontrados nos ossos, cartilagens e tecidos conjuntivos de vertebrados, atualmente usado no tratamento de osteoartrose. Diante disso, o objetivo do presente...
Tipo: Tese/dissertação (ALICE) Palavras-chave: Agente Reticulante; Polymers; Gels.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1103411
Imagem não selecionada

Imprime registro no formato completo
Lignina kraft e breu como adesivo de madeira. Repositório Alice
LOURENÇON, T. V.; MUNIZ, G. I. B. de; MAGALHAES, W. L. E..
Um dos maiores desafios na atualidade é a de transformar resíduos ou subprodutos de biomassa em produtos de alto valor agregado e que possam vir a substituir produtos de origem sintética. Assim, como alternativa a polímeros sintéticos, esse estudo teve por objetivo avaliar a eficiência de adesivos naturais a partir de lignina kraft e breu na colagem de madeira. As madeiras utilizadas para testar os adesivos foram da espécie de Pinus taeda. Este material foi climatizado (65% de umidade relativa e 20ºC) antes da adição dos adesivos. Quatro diferentes formulações de matéria-prima foram utilizadas para testar os adesivos. Os adesivos foram confeccionados, distribuídos na superfície das amostras de madeira, as quais foram prensadas (1,5 ton) a 85°C, durante 15...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Adesivo natural; Polímero; Bioadhesive; Pine gum; Madeira; Resina; Lignina; Pinus; Polymers; Lignin.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1067185
Imagem não selecionada

Imprime registro no formato completo
Mitigação das emissões de óxido nitroso pelo uso de fertilizantes nitrogenados revestidos. Repositório Alice
GISSI, L. de.
O objetivo deste trabalho foi avaliar se a ureia revestida proporciona redução de emissões de CO2 eq e se as técnicas industriais de revestimento dos grânulos de ureia são econo-micamente viáveis.
Tipo: Tese/dissertação (ALICE) Palavras-chave: Fertilizantes nitrogenados; Gases do efeito estufa; Mitigação; Ureia revestida; Polímero; Aquecimento global; Mitigation; Protected urea; Greenhouse gases; Polymers; Global warming.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1068024
Imagem não selecionada

Imprime registro no formato completo
Pharmaceutical films made from the waste material from the preparation of propolis extracts: development and characterization BJPS
Toledo,Lucas de Alcântara Sica de; Bavato,Maíra Isabeli; Rosseto,Hélen Cássia; Cortesi,Rita; Bruschi,Marcos Luciano.
abstract This study investigated the development and characterized the physicochemical properties of films obtained from by-products (BP) from the preparation of propolis extracts. Films were produced in the presence and absence of a polymeric adjuvant (gelatin or ethylcellulose) and propylene glycol by a solvent casting method. Density, surface topography by scanning electron microscopy, mechanical properties (folding endurance, tensile strength and percentage elongation), water vapour permeability (WVP), moisture uptake capacity, thermogravimetry, differential scanning calorimetry and Fourier transform infrared spectroscopy (FTIR) were determined. The films were a transparent, light greenish-yellow colour, with a uniform surface, and were flexible and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Propolis/byproducts; Propolis/use of waste material/films development; Films/propolis byproducts/physicochemical properties; Polymers; Ethylcellulose; Gelatin.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502015000400847
Imagem não selecionada

Imprime registro no formato completo
Preparation of biodegradable composites with peach palm biomass. Repositório Alice
SÁ, F. P. de; ARTNER, M. A.; ARANTES, M. S. T.; MATOS, M. de; MAGALHAES, W. L. E..
bitstream/item/207387/1/2019-RAC-Washington-CIBIO-Preparation.pdf
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Polímero; Bactris Gasipaes; Pupunha; Biomassa; Waste management; Polymers.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1117155
Imagem não selecionada

Imprime registro no formato completo
Ten Myths about Tannins in Sorghums Open Agri
Rooney, L.
Palavras-chave: Organic acids; Sorghum; Antioxidants; Pigments; Phenols; Linseed; Aromatic compounds; HPLC; Bakery products; Polymers.
Ano: 2005 URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3264
Imagem não selecionada

Imprime registro no formato completo
Use of natural deep eutectic solvents for polymerization and polymer reactions. Repositório Alice
GÓMEZ, A. V.; BISWAS, A.; TADINI, C. C.; FURTADO, R. F.; ALVES, C. R.; CHENG, H. N..
bitstream/item/208777/1/ART19078.pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Polymer hydrolysis; Natural deep Eutectic solvents; Polymer modifications; Polymer reactions; Hidrólise de polímeros; Modificações de polímeros; Reações de polímeros; Polimerização; Polymers; Polymerization.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1118759
Registros recuperados: 21
Primeira ... 12 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional