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	Provedor de dados BJM (2) BABT (1) Electron. J. Biotechnol. (1) Autor Pereira Junior,Nei (4) Lemos,Judith Liliana Solórzano (2) Bon,Elba P.S. (1) Ciapina,Elisa Mara Prioli (1) Edison Lopes,Carlos (1) Gomes de Andrade Lima,Maria Alice (1) Gomes,Edelvio de Barros (1) Pacheco,Graziela Jardim (1) Perez Fernandez Palha,María de los Angeles (1) Santana,Maria de Fátima Ebole (1) Mais... Palavra-chave Aspergillus awamori (2) Beta-xylosidase (1) Biosurfactant production (1) Catabolic repression (1) Endoxylanases (1) Oil removal (1) Rhodococcus erythropolis (1) Thermostability (1) Xylanases (1) Mais... Tipo do documento Info:eu-repo/semantics/article (3) Journal article (1) Ano 2010 (1) 2002 (2) 2000 (1) País Brazil (3) Chile (1) Idioma Inglês (4)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 4 Primeira ... 1 ... Última The influence of centrifugation on Zymomonas mobilis aggregation Electron. J. Biotechnol. Perez Fernandez Palha,María de los Angeles; Edison Lopes,Carlos; Gomes de Andrade Lima,Maria Alice; Pereira Junior,Nei. Flocculent Zymomonas mobilis breaks down in smaller flocs and individual cells when centrifuged. The main consequence of it is an increase in the dispersion of the sample, suggesting that the influence of the centrifugal force on the aggregation of cells is worth to study. The experiments showed that the degree of dispersion varied between 30% and 100% when the centrifugal acceleration changed from 25 g to 2500 g. Observation under the electronic microscope showed that a slimy material covered the cells recovered by gentle gravitational settling and, that the centrifuged cells presented a bare cell wall. Tipo: Journal article Ano: 2002 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582002000300011 Influence of some sugars on xylanase production by Aspergillus awamori in solid state fermentation BABT Lemos,Judith Liliana Solórzano; Pereira Junior,Nei. Aspergillus awamori showed high extracellular endoxylanase (100 U/ml) and beta-xylosidase activities (3.5 U/ml) when grown on milled sugar cane bagasse as the principal carbon source without treatment. Partial characterization of xylanases showed that the apparent values of Km were 3.12 ± 0.05 mg/ml for endoxylanase (in birchwood xylan) and 0.45 ± 0.05 mM for beta-xylosidase (in p -nitrophenyl beta-D-xylanopiranoside). Corresponding values of Vmax were 6.63 ± 0.02 and 0.078 ± 0.02 mumol/min. Gradual repression of endoxylanase activity was observed when increasing concentrations of glucose and xylose (1, 2, 4, 6 and 8 g of carbohydrate / 4 g of sugar cane bagasse) were added to production media. In contrast, beta-xylosidase activity was stimulated using low... Tipo: Info:eu-repo/semantics/article Palavras-chave: Aspergillus awamori; Endoxylanases; Beta-xylosidase; Catabolic repression. Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000600005 Biosurfactant production by Rhodococcus erythropolis and its application to oil removal BJM Pacheco,Graziela Jardim; Ciapina,Elisa Mara Prioli; Gomes,Edelvio de Barros; Pereira Junior,Nei. The influence of different nutrients on biosurfactant production by Rhodococcus erythropolis was investigated. Increasing the concentration of phosphate buffer from 30 up through 150 mmol/L stimulated an increase in biosurfactant production, which reached a maximum concentration of 285 mg/L in shaken flasks. Statistical analysis showed that glycerol, NaNO3,MgSO4 and yeast extract had significant effects on production. The results were confirmed in a batchwise bioreactor, and semi-growth-associated production was detected. Reduction in the surface tension, which indicates the presence of biosurfactant, reached a value of 38 mN/m at the end of 35 hours. Use of the produced biosurfactant for washing crude oil-contaminated soil showed that 2 and 4 times the... Tipo: Info:eu-repo/semantics/article Palavras-chave: Biosurfactant production; Oil removal; Rhodococcus erythropolis. Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000300019 Thermal stability of xylanases produced by Aspergillus awamori BJM Lemos,Judith Liliana Solórzano; Bon,Elba P.S.; Santana,Maria de Fátima Ebole; Pereira Junior,Nei. The effect of temperature on the activity and stability of endoxylanase and beta-xylosidase from Aspergillus awamori was investigated. The growth of A. awamori in milled sugar cane bagasse produced predominantly extracellular endoxylanase (30 U/ml) and lower amounts of beta-xylosidase (1.3 U/ml). Grown in sugar cane bagasse as the principal carbon source, the microorganism produced a quite stable beta-xylosidase in a temperature range of 35-55°C, but it exhibited a lower thermostable endoxylanase. The thermostability of endoxylanase was enhanced through addition of polyhydric alcohols, mainly 2 M xylitol and sorbitol solutions. Particular stability upon storage (100%) was found for endoxylanase at -4°C for 165 days. Yet for beta-xylosidase, an activity... Tipo: Info:eu-repo/semantics/article Palavras-chave: Aspergillus awamori; Thermostability; Xylanases. Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822000000300010 Registros recuperados: 4 Primeira ... 1 ... Última

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