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Registros recuperados: 15 | |
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Xu,Ping; Bura,Renata; Doty,Sharon L.. |
Two novel endophytic yeast strains, WP1 and PTD3, isolated from within the stems of poplar (Populus) trees, were genetically characterized with respect to their xylose metabolism genes. These two strains, belonging to the species Rhodotorula graminis and R. mucilaginosa, respectively, utilize both hexose and pentose sugars, including the common plant pentose sugar, D-xylose. The xylose reductase (XYL1) and xylitol dehydrogenase (XYL2) genes were cloned and characterized. The derived amino acid sequences of xylose reductase (XR) and xylose dehydrogenase (XDH) were 32%~41% homologous to those of Pichia stipitis and Candida. spp., two species known to utilize xylose. The derived XR and XDH sequences of WP1 and PTD3 had higher homology (73% and 69% identity)... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rhodotorula graminis; Rhodotorula mucilaginosa; D-xylose metabolism; Xylitol; Xylitol dehydrogenase; Xylose reductase. |
Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000300018 |
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Sousa,Letícia Pinheiro de; Silva,Annelisa Farah da; Calil,Natalia Oliveira; Oliveira,Murilo Gomes; Silva,Silvio Silvério da; Raposo,Nádia Rezende Barbosa. |
This study evaluated, in vitro, the antimicrobial activity and the anti-adherent property of xylitol (0.5, 2.5 and 5.0%, w/v) on two Pseudomonas aeruginosa strains (ATCC 9027 and clinical). The assay of antimicrobial activity was performed to determine a minimum inhibitory concentration (MIC) and the adhesion test was performed, by which the parameters regarding, growth in the culture medium, number of colony forming units (CFUs) released and slide evaluation by scanning electron microscopy (SEM) were analyzed. The Statistical Package for the Social Sciences (SPSS) was employed for statistical analysis. Results showed that xylitol had no antimicrobial activity on these strains; however, the inhibition of bacterial adherence was observed in microphotographs... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacterial adhesion; Pseudomonas aeruginosa; Prevention and control; Xylitol. |
Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000500004 |
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Silva,Débora Danielle Virgínio da; Mancilha,Ismael Maciel de; Silva,Silvio Silvério da; Felipe,Maria das Graças de Almeida. |
The effect of glucose on xylose-to-xylitol bioconversion by Candida guilliermondii was examined by adding it to sugarcane bagasse hydrolysate medium to obtain different glucose:xylose ratios (1:25, 1:12, 1:5 and 1:2.5). Under experimental conditions, increasing glucose:xylose ratio improved the assimilation of the xylose present in the hydrolysate by yeast, resulting in biomass increase, and in the formation of xylitol and glycerol/ethanol by-products. Maximum values of xylitol yield (0.59 g g-1) and volumetric productivity (0.53 g l-1.h-1) were obtained with glucose:xylose ratio of 1:5, resulting in the higher conversion efficiency (64.3%). |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Candida guilliermondii; Glucose; Sugarcane bagasse hydrolysate; Xylitol; Xylose. |
Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000200005 |
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Silva,Débora D.V.; Felipe,Maria G.A.; Mancilha,Ismael M.; Luchese,Rosa H.; Silva,Sílvio S.. |
Sugarcane bagasse hydrolysate (initial acetic acid concentration = 3.5g/L), was used as a fermentation medium for conversion of xylose into xylitol by the yeast Candida guilliermondii FTI 20037. Acetic acid (2.0g/L) was added to the medium at different times of fermentation, with the aim of evaluating its effects on the bioconversion process. The addition of acetic acid to the medium after 12h of fermentation resulted in the strongest inhibition of the yeast metabolism. In this case, the xylose consumption and cell growth were, respectively, 23.22 and 11.24% lower than when acid was added to the medium at the beginning of fermentation. As a consequence of the inhibitory effect, lower values of the xylitol yield (0.39g/g) and productivity (0.22g/L.h) were... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Xylitol; Xylose; Acetic acid; Sugarcane bagasse hydrolysate. |
Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822004000200014 |
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Registros recuperados: 15 | |
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