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Registros recuperados: 16
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Ageing mechanism and mechanical degradation behaviour of polychloroprene rubber in a marine environment: Comparison of accelerated ageing and long term exposure ArchiMer
Le Gac, Pierre-yves; Le Saux, V.; Paris, M; Marco, Y..
Polymers are widely used in marine environments due to their excellent properties and good weathering resistance. Despite this extensive use, their long term behaviour in such an aggressive environment is still not well known. To assess the polymer durability within reasonable durations, it is essential to perform accelerated ageing tests to accelerate the degradation kinetics but without any modification of the degradation process. This study therefore proposes and validates accelerated ageing tests to study marine ageing of a silica-filled chloroprene rubber (CR) used for offshore applications. Several accelerated ageing protocols are investigated for temperatures ranging from 20 to 80 degrees C in renewed natural seawater. The ageing consequences are...
Tipo: Text Palavras-chave: Chloroprene rubber; Degradation; Sea water; Silica; Accelerated ageing; Natural ageing.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00073/18429/20232.pdf
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Effects of pH, redox condition, and temperature on silica sorption in Philippine and Korean rice soils International Rice Research Institute
Lee, Sang-Eun.
136 leaves : ill. Thesis (Ph.D.) -- University of the Philippines at Los Baños
Tipo: Thesis Palavras-chave: Rice; Rice soils; Soil pH; Redox reactions; Soil temperature; Silica; Sorption; Soil chemistry; Philippines; Korea Republic.
Ano: 1991 URL: http://hdl.handle.net/123456789/943
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Effects of silica in resistance and susceptible rice varieties on Nilaparvata lugens (Stal) and its natural enemy Cyrtorhinus lividipennis Reuter International Rice Research Institute
Chaiyawat, Patchanee.
139 leaves : ill. Thesis (Ph.D.) -- University of the Philippines at Los Baños
Tipo: Thesis Palavras-chave: Silica; Pest resistance; Nilaparvata lugens; Cytrorhinus lividipennis.
Ano: 1994 URL: http://hdl.handle.net/123456789/693
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Evaluation of Some Biological Aspects of the Presence of Abrasive Silica and Thickening Silica  in Basic Formulations of Dentifrices International Journal of Morphology
Pedrazzi,Vinícius; Del Ciampo,José Orestes; do Nascimento,Cássio; Issa,João Paulo Mardegan.
The aim of this study was to evaluate some biological characteristics and toxicity of basic formulations of dentifrices containing such substances, and to compare them with two existing products in market which also contains silic in their formulations. In this way, it was evaluated some biological parameters: weight of the animals, oral toxicity, hematological parameters, urinary analysis, and histological evaluation. The thrombocytes were also statistically at normal levels. The glutamate-pyruvate transaminase (TGP) showed normal aspect in 5 of the tested groups, as in control. Meanwhile, the oxalacetic transaminase (AST) in one group had a small increase in the control group. Regarding urine, in exception the rats of one group, the rats of the 4 other...
Tipo: Journal article Palavras-chave: Silica; Dentifrices; Histology; Wistar rats.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000100028
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Geochemistry and mineralogy of a silica chimney from an inactive seafloor hydrothermal field (East Pacific Rise, 18°S) ArchiMer
Dekov, V. M.; Lalonde, Stefan; Kamenov, G. D.; Bayon, Germain; Shanks, W. C., Iii; Fortin, D.; Fouquet, Yves; Moscati, R. J..
An inactive vent field comprised of dead chimneys was discovered on the ultrafast East Pacific Rise (EPR) at 18°S during the research campaign NAUDUR with the R/V Le Nadir in December 1993. One of these chimneys was sampled, studied and found to be largely composed of silica-mineralized bacterial-like filaments. The filaments are inferred to be the result of microbial activity leading to silica (± Fe-oxyhydroxide) precipitation. The chimney grew from the most external layer (precipitated 226 ± 4 yr. B.P.) towards the central chimney conduit. Hydrothermal activity ceased 154 ± 13 yr. B.P. and the chimney conduit was completely sealed. Mixing between an end-member hydrothermal fluid and seawater explains the Sr–Nd isotopic composition of the chimney....
Tipo: Text Palavras-chave: Chimney; C-O-Si-Sr-Nd-Pb-Th-U isotopes; Hydrothermal; Seafloor; Silica.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00280/39143/37698.pdf
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Immobilization of cyclodextrin glucanotransferase on aminopropyl-functionalized silica-coated superparamagnetic nanoparticles Electron. J. Biotechnol.
Ibrahim,Abdelnasser S.S.; Al-Salamah,Ali A; El-Toni,Ahmed Mohamed; El-Tayeb,Mohamed A; Elbadawi,Yahya B.
Background: Cyclodextrin glycosyltransferase (CGTase) from Amphibacillus sp. NPST-10 was successfully covalently immobilized on aminopropyl-functionalized silica coated superparamagnetic nanoparticles; and the properties of immobilized enzyme were investigated. The synthesis process included preparing of core magnetic magnetite (Fe3O4) nanoparticles using solvothermal synthesis; followed by coating of Fe3O4 nanoparticles with dense amino-functionalized silica (NH2-SiO2) layer using in situ functionalization method. The structure of synthesized Fe3O4@NH2-SiO2 nanoparticles was characterized using TEM, XRD, and FT-IR analysis. Fe3O4@NH2-SiO2 nanoparticles were further activated by gluteraaldehyde as bifunctional cross linker, and the activated nanoparticles...
Tipo: Journal article Palavras-chave: Amphibacillus sp. NPST-10; Cyclodextrin glucanotransferase; Immobilization; Magnetic nanoparticle; Silica.
Ano: 2013 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000600010
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Isolation of high quality DNA: a protocol combining “rennet” and glass milk Electron. J. Biotechnol.
Valter de Oliveira,Luiz Felipe; Wallau,Gabriel da Luz; Silva Loreto,Elgion Lucio.
High quality DNA is essential for many molecular biology techniques. However, the reagents used for that purpose usually are expensive and/or cause a high environmental impact. Here, we describe two alternative protocols that use inexpensive reagents and are not hazardous to the environment. The first protocol utilizes the enzyme chymosin, normally used as “rennet” in cheese production and which is easily obtained on the commercial market. The second protocol uses “rennet DNA extraction protocol” combined with the DNA binding capacity of glass powder (glass milk), which can easily be “home made”. The first protocol is used when a high yield of DNA is needed, whereas the second protocol is used for...
Tipo: Journal article Palavras-chave: Chymosin; DNA extraction; Glass milk; Rennet; Rennin; Silica.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000200011
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Novos sorventes baseados em Poli(Metiloctilsiloxano) sobre sílica para uso em extração em fase sólida. Repositório Alice
QUEIROZ, S. C. do N. de; MELO, L. F. C.; JARDIM, I. C. S. F..
This paper presents an easy and practical procedure to obtain silica-based C-8 type sorbents for use in solid-phase extraction. The materials are prepared by depositing poly(methyloctylsiloxane), PMOS, on the silica support. Two different treatments for immobilization were used: thermal treatment or gamma irradiation. Suitable recoveries were obtained after pre-concentration of dilute solutions, at the ng/L level, of a mixture of pesticides, indicating the good performance of the materials.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Extração em fase sólida; Técnica; Polímero; Sorvente; Irradiação gama; Tratamento térmico; Procedimentos; Silica; Pesticida.
Ano: 2006 URL: http://www.alice.cnptia.embrapa.br/handle/doc/15350
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Nutritive value of Panicum maximum genotypes under grazing in the Amazon Biome. Repositório Alice
ANDRADE, C. M. S. de; JANK, L.; FARINATTI, L. H. E.; NASCIMENTO, H. L. B. do.
2013
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Digestibility; Guineagrass; Lignin; Plant fiber; Protein; Silica.
Ano: 2013 URL: http://www.alice.cnptia.embrapa.br/handle/doc/972541
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O uso de nanopartículas para a liberação controlada de semioquímicos de insetos e plantas. Repositório Alice
HASSEMER, M. J.; BLASSIOLI MORAES, M. C.; BORGES, M.; LAUMANN, R. A.; BEMQUERER, M.; RODRIGUES, M.; COSTA, E. S.; VAZ JUNIOR, S.; MAGALHÃES, D. M.; MICHEREFF, M. F. F..
bitstream/item/168945/1/Anais-IX-1Workshop-de-Nanotecnologia-466-470.pdf
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Release control; Rubber septa; Liberação controlada; Septos de borracha; Feromônio; Lignina; Sílica; Pheromones; Lignin; Silica.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1082471
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Relação entre número de estegmata na epiderme foliar e intensidade da antracnose em Stylosanthes spp. Repositório Alice
JERBA, V. de F.; FERNANDES, C.D.; POTT, A..
O objetivo deste trabalho foi quantificar o número de estegmata em cinco espécies de Stylosanthes e relacioná-lo à severidade da antracnose. Quantificaram-se os estegmata em secções foliares paradérmicas, coradas com safranina a 1%. A antracnose foi avaliada no 12o dia, depois da inoculação de Colletotrichum gloeosporioides. As espécies apresentaram número semelhante de estegmata na epiderme foliar, à exceção de S. guianensis, que apresentou menor quantidade. Maior severidade da antracnose foi observada em S. macrocephala e, em seguida, em S. capitata. Não foi constatada correlação significativa entre número de estegmata na epiderme foliar e a severidade da doença.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Botânica estrutural; Fitopatologia; Forrageira; Resistência; Sílica; Structural botany; Phytopathology; Forage; Resistance; Silica.
Ano: 2006 URL: http://www.alice.cnptia.embrapa.br/handle/doc/118435
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Survival of groundnut seeds under different storage conditions Open Agri
Sastry, D.V.S.S.R..
Palavras-chave: Seed viability; Seed longevity; Seed testing; Seed storage; Groundnuts; Sampling; Silica; Storage; Germplasm; Temperature.
Ano: 2007 URL: http://agropedia.iitk.ac.in/openaccess/?q=node/3356
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The influence of silica and nitrogen fertilization upon the growth and yield of Peta and Chianung 242 lowland rice varieties International Rice Research Institute
Espada, Wilfredo G..
104 leaves : graphs, tables. Thesis (M.S.) -- University of the Philippines
Tipo: Thesis Palavras-chave: Rice; Nitrogen fertilizers; Silica; Plant physiology; Cultivars; Lowlands; Peta (rice variety); Chianung 242 (rice variety).
Ano: 1965 URL: http://hdl.handle.net/123456789/429
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Use of resistant varieties and organic nutrients to manage yellow stem borer in rice International Rice Research Institute
Rani, B. U.; Rajendran, R.; Suresh, K..
p.39-41
Tipo: Article Palavras-chave: Botanical insecticides; Farmyard manure; Fly ash; Insect control; Insect pests; Neem seed cake; Organic amendments; Pest resistance; Phosphate solubilizing bacteria; Silica; Scirpophaga incertulas; India.
Ano: 2006 URL: http://hdl.handle.net/10269/124
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دراسة مواد البناء البديلة فى منطقة البحر الأحمر: المواد البوزولانية OceanDocs
Edris, Abass Edris Alsaid.
Pozzolana is a materials that content Reactive Silica with Alumina which defines as Siliceous materials, also include ferroginous materials. In generally, this study aimed to estimate Alternative building materials ( pozzolanic materials ) and create new cementic materials such as Lime-Pozzolana Cement and Ordinary Portland-Pozzolana Cement . The results shows that there is no good and sufficient pozzolanic materials as Obsidian , Scoria, Diatomaceous Earth and Volcanic Ash , but some types of burnt clays and Rhyolite in addition to bricks Reject and miskeet Ash was shown . This study is subjected in Arbaat Delta clay , salloum Delta clay , Rhyolite Rocks , bricks Reject and miskeet Ask as Natural and artificial pozzolanic materials. The identification of...
Tipo: Theses and Dissertations Palavras-chave: Silica.
Ano: 2012 URL: http://hdl.handle.net/1834/5073
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ใช้ซิลิก้าควบคุมแมลงศัตรูข้าว Thai Agricultural
Patchanee Chaiyawat.
Tipo: Collection Palavras-chave: Rice; Insect pest Control; Silica; ข้าว; แมลงศัตรูข้าว; การป้องกันกำจัด; ซิลิก้า.
Ano: 2005 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5294
Registros recuperados: 16
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