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Production of Cellulolytic Enzymes by <Emphasis Type="Italic">Aspergillus phoenicis</Emphasis> in Grape Waste using Response Surface Methodology 总被引:1,自引:0,他引:1
Dedavid e Silva LA Lopes FC Silveira ST Brandelli A 《Applied biochemistry and biotechnology》2009,152(2):295-305
The production of cellulolytic enzymes by the fungus Aspergillus phoenicis was investigated. Grape waste from the winemaking industry was chosen as the growth substrate among several agro-industrial
byproducts. A 2 × 2 central composite design was performed, utilizing the amount of grape waste and peptone as independent
variables. The fungus was cultivated in submerged fermentation at 30 °C and 120 rpm for 120 h, and the activities of total
cellulases, endoglucanases, and β-glucosidases were measured. Total cellulases were positively influenced by the linear increase
of peptone concentration and decrease at axial concentrations of grape waste and peptone. Maximum activity of endoglucanase
was observed by a linear increase of both grape waste and peptone concentrations. Concentrations of grape waste between 5
and 15 g/L had a positive effect on the production of β-glucosidase; peptone had no significant effects. The optimum production
of the three cellulolytic activities was observed at values near the central point. A. phoenicis has the potential for the production of cellulases utilizing grape waste as the growth substrate. 相似文献
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A Study of Precipitates Formation in AA 380.0 Aluminium Alloys Modified by the Addition of Magnesium
Dedavid B. A. Costa E. M. Ferreira C. R. F. 《Journal of Thermal Analysis and Calorimetry》2002,67(2):473-480
A data acquisition system and the SAD2 software, that provide characteristic cooling curves, in combination with microstructure
analysis were used to study precipitates formation in the AA380.0 aluminium alloys modified by adding extra magnesium. The
samples were solidified with distinct cooling rates caused by carrying out the solidification in shell and permanent molds.
The mathematics processing of the cooling curves in agreement with the microstructure analysis have confirmed the remarkable
presence of both the Al–Si dendrite network and the Mg2Si interdendritic phase in the alloys with the addition of extra magnesium.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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