indexado en
  • Base de datos de revistas académicas
  • Genamics JournalSeek
  • Claves Académicas
  • DiarioTOCs
  • Infraestructura Nacional de Conocimiento de China (CNKI)
  • cimago
  • Acceso a Investigación Global en Línea en Agricultura (AGORA)
  • Biblioteca de revistas electrónicas
  • Búsqueda de referencia
  • Directorio de indexación de revistas de investigación (DRJI)
  • Universidad Hamdard
  • EBSCO AZ
  • OCLC-WorldCat
  • Catálogo en línea SWB
  • Biblioteca Virtual de Biología (vifabio)
  • Publón
  • miar
  • Comisión de Becas Universitarias
  • Fundación de Ginebra para la Educación e Investigación Médica
  • pub europeo
  • Google Académico
Comparte esta página
Folleto de diario
Flyer image

Abstracto

Optimization of Submerged Culture Conditions for Exo-Polysaccharides Production by Streptomyces Nasri-UV 135 in Bioreactor

Usama Beshay, Ayman Daba and Yousry Gohar

Production of Exopolysaccharides ?EPS? and microbial biomass by Streptomyces nasri were influenced by the type of carbon source (glycerol, xylose, fructose, galactose, glucose, mannose, sucrose, lactose, maltose, dextrin, soluble starch, corn starch and potato starch) and the nitrogen source (glycine, aspartic acid, glutamic acid, proline, ammonium sulphate, sodium nitrate and beef extract ) used in the medium. Xylose and glycine were the most suitable sources of carbon and nitrogen, respectively, for both production of EPS and mycelial growth. The highest EPS production was obtained in a medium containing (g/l) 30 xylose, 2.7 glycine, 4.0 NaCl, 0.5 MgSO4, 1.0 K2HPO4, and 1.0 CaCO3. Exopolysaccharides production and mycelial growth in the above suggested medium were significantly increased in a 3-l stirred tank bioreactor, where the maximum EPS concentration was 8.73 g/l, which was an approximately 1.6 time higher than that in shake culture.