Cellulosic Materials
Mostrando 13-24 de 32 artigos, teses e dissertações.
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13. Addition of mechanically processed cellulosic fibers to ionomer cement: mechanical properties
In this study, conventional restorative glass ionomer cement (GIC) was modified by embedding it with mechanically processed cellulose fibers. Two concentrations of fibers were weighed and agglutinated into the GIC during manipulation, yielding Experimental Groups 2 (G2; 3.62 wt% of fibers) and 3 (G3; 7.24 wt% of fibers), which were compared against a control
Braz. oral res.. Publicado em: 27/01/2015
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14. Production of cellulose-degrading enzyme on sisal and other agro-industrial residues using a new Brazilian actinobacteria strain Streptomyces sp. SLBA-08
Several types of lignocellulosic raw materials including wheat straw, sisal bagasse and sugarcane bagasse have different contents of cellulosic components. In our studies, aimed at isolating cellulose-degrading actinobacteria from Brazilian soils, a promising strain was selected and identified as Streptomyces sp. SLBA-08. This strain was tested for cellulase
Braz. J. Chem. Eng.. Publicado em: 2013-12
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15. Potencial da palha de cana-de-açúcar para produção de etanol
Sugarcane straw biomass accounts for 1/3 of the energy potential of sugarcane and represents a rich source of sugars. Studies have been intensified for the use of this biomass along with bagasse for the production of cellulosic ethanol. Development of this technological path will allow for taking full advantage of sugarcane, increasing ethanol production wit
Química Nova. Publicado em: 2012
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16. Mecanismos envolvidos na biodegradação de materiais lignocelulósicos e aplicações tecnológicas correlatas
The biodegradation of lignocellulosic materials is an important natural process because it is responsible for the carbon recycling. When induced under controlled conditions, this process can be used for technological applications such as biopulping, biobleaching of cellulosic pulps, pre-treatment for subsequent saccharification and cellulosic-ethanol product
Química Nova. Publicado em: 2011
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17. Avaliação do potencial da casca de Eucalyptus spp. para a produção de bioetanol / Evaluation of the potential use of Eucalyptus spp. bark for bioethanol production
The use of no fossil source for biofuels production has been stimuled in the all world. Proposing a new global scenario related to the energy matrix, together with the environmental conditions, there is the need to search alternative renewable raw materials. In this context, Brazil presents special conditions, considering the lignocellulosic residues from th
Publicado em: 2010
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18. Tratamentos adsortivos e de oxidaÃÃo avanÃada de fenol, 2-nitrofenol e 4-nitrofenol em soluÃÃo aquosa / Adsortivos treatments and of advanced phenol oxidation, 2-nitrofenol and 4-nitrofenol in watery solution
Neste trabalho foram realizados estudos de adsorÃÃo em batelada e de oxidaÃÃo avanÃada para a remoÃÃo de fenol (F), 2-nitrofenol (2NF) e 4-nitrofenol (4NF) em soluÃÃo aquosa. Nos estudos de adsorÃÃo foram empregados como adsorventes o pà de bagaÃo da casca de coco in natura (BIN), pà de bagaÃo in natura tratado com HCl 1,0 M (BT) e carvÃo ati
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/11/2009
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19. Preparation and characterization of mono-component two-phase system (SBM) by oxypropylation reaction of cellulose fibres and starch / Preparação e caracterização de sistema bifásico mono-componente (SBM) a partir da reação de oxipropilação de fibras celulósicas e amido
Chemical modifications were applied to cellulosic materials and starch with the objective to obtain products with an external thermoplastic layer while preserving the inner part of these substrates. The final products should behave as composite materials where the unmodified inner part is the reinforcement agent and the thermoplastic layer the matrix. The mo
Publicado em: 2007
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20. Reciclagem química do jornal para a produção de membranas de acetato de celulose pelo processo de acetilação homogêneo
In the present work, the chemical recycling of waste newspaper it was done through the homogeneous acetylation process applyed to original and purifyed materials. This materials were characterized by FTIR and TGA. To the sythesis, it was used 48 hours of acetylation to original newspaper (AC48) and 24 hours to purifyed newspaper (AC24). Membranes from this a
Publicado em: 2007
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21. Reciclagem quÃmica do jornal para a produÃÃo de membranas de acetato de celulose pelo processo de acetilaÃÃo homogÃneo
In the present work, the chemical recycling of waste newspaper it was done through the homogeneous acetylation process applyed to original and purifyed materials. This materials were characterized by FTIR and TGA. To the sythesis, it was used 48 hours of acetylation to original newspaper (AC48) and 24 hours to purifyed newspaper (AC24). Membranes from this a
Publicado em: 2007
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22. Avaliação da tecnologia de hidrolise acida de bagaço de cana / Evaluation surgarcane bagasse acid hydrolysis technology
One of the current concerns in the world is the energy supply for next decades, since the main energy source used nowadays is oil, a not renewable and increasingly expensive fossil fuel. Acid hydrolysis of cellulosic materials, with a subsequent fermentation of the hydrolyzed to obtain ethanol, has been considered an important alternative to produce ethanol
Publicado em: 2007
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23. Estudo das enzimas produzidas por Trichoderma longibrachiatum responsaveis pela degradação de materiais celulosicos
A total of 626 microorganisms were isolated from samples of soil and biodegraded cellulosic material collected from various areas in Brazil. One mesophilic fungus which was identified as Trichoderma longibrachiatum was selected. The production and characterization of the enzymes, which promote the degradation of cellulosic materials, were studied. Relatively
Publicado em: 1992
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24. Assimilation of Cellooligosaccharides by a Cell Surface-Engineered Yeast Expressing β-Glucosidase and Carboxymethylcellulase from Aspergillus aculeatus
Since Saccharomyces cerevisiae lacks the cellulase complexes that hydrolyze cellulosic materials, which are abundant in the world, two types of hydrolytic enzymes involved in the degradation of cellulosic materials to glucose were genetically co-immobilized on its cell surface for direct utilization of cellulosic materials, one of the final goals of our stud
American Society for Microbiology.