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Search for "KŘEN V.": 2 articles found.
HUŇKOVÁ Z., KUBÁTOVÁ A., WEIGNEROVÁ L., KŘEN V. (1999): Induction of extracellular glycosidases in filamentous fungi and their potential use in chemotaxonomy. [glycosidases, induction, Aspergillus, Penicillium, Fusarium] Czech Mycology 51(1): 71-87 (published: 29th January, 1999)
abstract
Data on the occurrence and inducibility of extracellular β-N-acetylhexosaminidase, α-galactosidase, α- and β-mannosidase and α-L-fucosidase, including inductors, are given for selected Aspergillus, Penicillium and Fusarium strains. These data represent additional information on the strains in the Culture Collection of Fungi, Department of Botany, Charles University, Prague, and in the Culture Collection of the Institute of Microbiology, Prague, Czech Republic, thus extending their usability in biochemistry and biotechnology. With respect to these biochemical data a taxonomic evaluation of the examined strains is presented. Several strains were re identified after biochemical and morphological comparisons with the type strains. The strains of A. niveus CCF 544, A. terreus CCF 76, CCF 869, and CCIM USA were re-identified as A. flavipes, the strain A. oryzae CCF 1301 as A. wentii.
KŘEN V., KOZOVÁ J., LUDVÍK J., KOFROŇOVÁ O., ŘEHÁČEK Z. (1988): Physiological activity of immobilized Claviceps cells producing clavine alkaloids. Česká Mykologie 42(1): 52-55 (published: 10th February, 1988)
abstract
Immobilized cells of the saprophytic Claviceps fusiformis culture can be cultivated under semicontinuous conditions for long time periods. The biocatalyst can produce alkaloids for up to 550 days with 25 cycles of the medium replacement. Specific productivity of the catalyst (average during first 100 days) is 6200 μg of alkaloids per g wet mass of the mycelium per day. During 50 days of semicontinuous cultivation, the immobilized cells maintained sufficient activity of key catabolic pathways and thus a physiological state suitable for the production of clavine alkaloids. Morphological and ultrastructural changes were studied with scanning and transmission electron microscopy.
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