Isolation and Characterization of Bacteria from the Gut of Bombyx mori that Degrade Cellulose, Xylan, Pectin and Starch and Their Impact on Digestion

Bombyx mori L. (Lepidoptera: Bombycidae) have been domesticated and widely used for silk production. It feeds on mulberry leaves. Mulberry leaves are mainly composed of pectin, xylan, cellulose and starch. Some of the digestive enzymes that degrade these carbohydrates might be produced by gut bacteria. Eleven isolates were obtained from the digestive tract of B. mori, including the Gram positive Bacillus circulans and Gram negative Proteus vulgaris, Klebsiella pneumoniae, Escherichia coli, Citrobacter freundii, Serratia liquefaciens, Enterobacter sp., Pseudomonas fluorescens, P. aeruginosa, Aeromonas sp., and Erwinia sp.. Three of these isolates, P. vulgaris, K. pneumoniae, C. freundii, were cellulolytic and xylanolytic, P. fluorescens and Erwinia sp., were pectinolytic and K. pneumoniae degraded starch. Aeromonas sp. was able to utilize the CMcellulose and xylan. S. liquefaciens was able to utilize three polysaccharides including CMcellulose, xylan and pectin. B. circulans was able to utilize all four polysaccharides with different efficacy. The gut of B. mori has an alkaline pH and all of the isolated bacterial strains were found to grow and degrade polysaccharides at alkaline pH. The number of cellulolytic bacteria increases with each instar

Aufarbeitung und Recycling von den beim Spruehkompaktieren anfallenden Rueckstaenden aus Legierungen und Verbundwerkstoffen Abschlussbericht

A certain amount of mostly powdered material is one of the undesirable by-products of spray compaction. This so called 'overspray' has a negative influence on the cost-effectiveness of the process because of the material losses. The aim of the study documented in this report was to establish technologies for recycling of the overspray material and the setting up of implementable allround process concepts for spray compaction, where the further processing of the residues is incorporated in the overall plant design. Safety requirements had a decisive effect on the process engineering planning. The studies were confined to aluminium and copper based materials, their alloys and metal matrix composites. (orig.)Available from TIB Hannover: F94B1590+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman

Wasserstoffbedingte und prueftechnische Einfluesse bei H-induzierter Korrosion von Bau- und Roehrenstaehlen Schlussbericht

SIGLEAvailable from TIB Hannover: FR 6679 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman