Results 31 to 40 of about 74,847 (227)

Borracha natural e nanocompósitos com argila [PDF]

Química Nova, 2009
The natural rubber is a strategic material which can not be replaced by synthetic rubber in many technological applications. Brazil is a rubber importer, but new techniques of cultivation, breeding and diversification of producing species can reverse this situation. One of the best ways to add value to this commodity is nanotechnology.
Rippel, Márcia Maria, Bragança, Fábio do Carmo   +1 more
openaire   +3 more sources

USO DA ARGILA CHOCOLATE COMO ALTERNATIVA NO TRATAMENTO DE EFLUENTES DE REFINARIAS DE PETRÓLEO

Holos, 2017
Contando com uma produção média de 2 milhões e 799 mil barris de óleo por dia (bpd), o Brasil conta com 15 refinarias petróleo. Contudo, as refinarias têm forte impacto poluidor. Utilizam-se aproximadamente 246 a 340 litros de água por barril de petróleo
Natália Porfírio Albuquerque, Ana Cristina Silva Muniz, André Luiz Fiquene Brito   +2 more
doaj   +1 more source

Update of the list of QPS‐recommended biological agents intentionally added to food or feed as notified to EFSA 10: Suitability of taxonomic units notified to EFSA until March 2019

EFSA Journal, Volume 17, Issue 7, July 2019., 2019
Abstract The qualified presumption of safety (QPS) procedure was developed to provide a harmonised generic pre‐evaluation to support safety risk assessments of biological agents performed by EFSA's Scientific Panels. The taxonomic identity, body of knowledge, safety concerns and antimicrobial resistance were assessed.
EFSA Panel on Biological Hazards (BIOHAZ), Kostas Koutsoumanis, Ana Allende, Avelino Alvarez‐Ordóñez, Declan Bolton, Sara Bover‐Cid, Marianne Chemaly, Robert Davies, Alessandra De Cesare, Friederike Hilbert, Roland Lindqvist, Maarten Nauta, Luisa Peixe, Giuseppe Ru, Marion Simmons, Panagiotis Skandamis, Elisabetta Suffredini, Pier Sandro Cocconcelli, Pablo Salvador Fernández Escámez, Miguel Prieto Maradona, Amparo Querol, Juan Evaristo Suarez, Ingvar Sundh, Just Vlak, Fulvio Barizzone, Sandra Correia, Lieve Herman   +26 more
wiley   +1 more source

Uso de bentonita na remediação de solos contaminados com zinco: efeito na produção de feijão Use of bentonite in the remediation of soils contaminated with zinc: effect on bean production

Revista Brasileira de Engenharia Agrícola e Ambiental, 2011
Diversos procedimentos têm sido propostos para reduzir a concentração de metais pesados nos solos, e, conseqüentemente, seus efeitos poluidores. Dentre eles destacam-se a aplicação de materiais, como a bentonita, capazes de adsorver estes elementos ...
Gilvanise A. Tito, Lucia H. G. Chaves, Hugo O. C. Guerra, Frederico A. L. Soares   +3 more
doaj   +1 more source

A micromorphological evaluation of pedogenesis on Isla Santa Cruz (Galápagos) [PDF]

, 2013
Thin sections of about 200 horizons or layers, representing 60 soil profiles in the coastal area and on the windward slopes of Isla Santa Cruz (Galápagos Islands) were analysed.
Stoops, Georges
core   +2 more sources

Caracterizações de argilas bentoníticas e síntese de argilas organofílicas para uso em nanocompósitos poliméricos: parte II [PDF]

Cerâmica, 2012
Nanocompósitos poliméricos tem atraído um considerável interesse, o que se deve a estes materiais oferecerem combinações incomuns de propriedades. As argilas esmectíticas são comumente utilizadas como fase dispersa na obtenção dos nanocompósitos, em particular destaque para as argilas bentoníticas.
Barbosa, R., Morais, D. D. S., Araújo, E. M., Mélo, T. J. A.   +3 more
openaire   +7 more sources

Prevalence of severe esophagitis in Spain. Results of the PRESS study (Prevalence and Risk factors for Esophagitis in Spain: A cross‐sectional study)

United European Gastroenterology Journal, Volume 4, Issue 2, Page 229-235, April 2016., 2016
Background The current prevalence of esophagitis in southern Europe is unknown. In addition, the risk factors for reflux esophagitis are not fully understood. Objective The objective of this article is to assess the prevalence and risk factors for esophagitis in Spain.
Núria Piqué, Marta Ponce, Vicente Garrigues, Luis Rodrigo, Félix Calvo, Carlos Martín de Argila, Fernando Borda, Antonio Naranjo, Javier Alcedo, María José Soria, Enrique Rey, Luis Bujanda, Javier P Gisbert, David Suarez, Xavier Calvet, Julio Ponce, PRESS Study Group   +16 more
wiley   +1 more source

Ocorrência de uma nova bentonita brasileira nos basaltos intemperizados da formação Mosquito, bacia do Parnaíba, sul do Maranhão Occurrence of a new brazilian bentonite in the weathered basalts of the Mosquito formation, Parnaíba basin, southern Maranhão, Brazil

Cerâmica, 2011
No município de Formosa da Serra Negra, sul do Maranhão, às margens da rodovia MA006, encontram-se afloramentos de basaltos intemperizados da Formação Mosquito, apresentando textura bastante argilosa e potencial de ser um material bentonítico.
S. P. A. Paz, R. S. Angélica, R. F. Neves, R. Neumann, G. M. da Costa   +4 more
doaj   +1 more source

Helicobacter pylori: From Bench to Bedside

Canadian Journal of Gastroenterology and Hepatology, Volume 11, Issue 7, Page 589-596, 1997., 1997
With the exponential increase in research in the field of Helicobacter pylori a paradigm shift has occurred. It is now recognized that H pylori is a chronic infection of the stomach causing inflammation. Some patients remain asymptomatic, while others may develop dyspepsia, duodenal or gastric ulcer, gastric cancer or a mucosa‐associated lymphoid ...
N Chiba, A Matisko, P Sinclair, ABR Thomson   +3 more
wiley   +1 more source

Effect of kaolinitic clays from the State of Rio de Janeiro in the composition of whiteware floor tile bodies Efeito de argilas cauliníticas do Estado do Rio de Janeiro na composição de massa de pavimento cerâmico de base clara

Cerâmica, 2006
This work presents an investigation that was undertaken for three types of kaolinitic clays from the State of Rio de Janeiro, Brazil, with a potential use in whiteware floor tiles bodies.
C. M. F. Vieira, L. A. Peçanha Jr., S. N. Monteiro   +2 more
doaj   +1 more source