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  • 1
    Electronic Resource
    Electronic Resource
    Production and properties of fibrinolytic enzyme fromStreptomyces sp. NRC 411 (1992)
    Springer
    World journal of microbiology and biotechnology 8 (1992), S. 267-269 
    Details
    ISSN: 1573-0972
    Keywords: Enzyme ; fibrinolysis ; Streptomyces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Of 16Streptomyces spp. investigated for the production of extracellular fibrinolytic enzyme, one species was chosen as the most promising producer. Using shaken cultures grown for 7 days, optimal conditions for enzyme production were pH 6.0, 5% (w/v) starch as carbon source, (NH4)2SO4 and soybean flour as nitrogen sources and KH2PO4 at 1.2 g/l. Maximal activity of the crude enzyme was at pH 6.0 and 45°C. Holding the enzyme at 37°C for 2 h decreased the activity by only 10%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01201876
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  • 2
    Electronic Resource
    Electronic Resource
    Comparison of β-glucosidase activities in different Debaryomyces strains (1987)
    Springer
    Applied microbiology and biotechnology 26 (1987), S. 552-554 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary β-Glucosidase production by Debaryomyces vanrigii and Debaryomyces hansenii was studied using two media. Cellobiose was found to stimulate the biosynthesis of the enzyme, while NH4NO3 (1.0 g/l) and NH4Cl (1.26 g/l) were the best nitrogen sources for D. hansenii and D. vanrigii respectively. Optimal conditions for enzyme activity were established in relation to pH, temperature and enzyme stability. Thermal and pH stability studies show that β-glucosidase from D. vanrigii was more stable at pH 4.5–5.0 at 50°C, while that enzyme from D. hansenii was stable at pH 6.5 at 35°C. This feature may be advantageous in the commercial application by hydrolysing cellobiose, the potent inhibitor of cellulose solubilizing enzymes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00253031
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Production of oxytetracycline by immobilized Streptomyces rimosus cells in calcium alginate gels (1994)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 14 (1994), S. 303-309 
    Details
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Streptomyces rimosus Pfizer 18234-2 cells were immobilized in calcium alginate and used for the production of oxytetracycline. The influence of the incubation period, alginate concentration and storage in CaCl2 were investigated. From the results of the repeated batch fermentations of the shake flasks, a good level of antibiotic was maintained for a period of about 28 days using 4% calcium alginate. The cell leakage and cell concentration inside the beads were affected by the alginate concentration and storage in CaCl2 solution.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370140316
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  • 4
    Electronic Resource
    Electronic Resource
    Infrared and antimicrobial studies on different lignins (1989)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 9 (1989), S. 295-298 
    Details
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The aim of this work is to study the IR spectra of the different lignins precipitated from the produced liquor of different pulping conditions of bagasse and cotton stalks, also to study their antimicrobial activities towards some bacteria and fungi.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370090322
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  • 5
    Electronic Resource
    Electronic Resource
    Production of oxytetracycline and rifamycins B and SV with cells immobilized on glass wool (1994)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 14 (1994), S. 67-74 
    Details
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The antibiotic producing microorganisms Streptomyces rimosus PFIZER 18234-2 and Amycolatopsis mediterranei CBS 42575 were immobilized in glass wool for the production of oxytetracycline and rifamycins B and SV. The growth of the immobilized cells was dependent on the type of the microorganism and on the amount of glass wool as well. After 5 exchanges of the medium, 530 mg O.T.C., 2138 mg rifamycin B and 8672 mg rifamycin SV were maintained. The periodic batch culture was continued for 20 days.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370140112
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  • 6
    Electronic Resource
    Electronic Resource
    Optimization of some culture parameters and properties of β-glucosidase and β-xylosidase from Penicillium funiculosum NRRL - 13033 (1989)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 9 (1989), S. 347-353 
    Details
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Penicillium funiculosum NRRL 13033 produced β-glucosidase and β-xylosidase activities when grown on wheat straw. The addition of some inducers (individually or in combination) to the fermentation medium were tested for the production of both enzymes. The relation of mycelial bound enzyme to cell free enzyme was studied during incubation period of fermentation. The optimum activity of β-glucosidase and β-xylosidase were found to be in the pH 4.5 using phosphate-citrate buffer at 50°C for 60 min and at 55°C for 40 min respectively. β-Glucosidase lost about 40% of its original activity by heating to 65°C for 60 min, while, β-xylosidase activity was found to be nearly stable with the same treatment. Both enzyme activities were greatly inhibited when 1.0% (w/v) of xylose and glucose were added to the assay mixture.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370090408
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Production of rifamycin B and SV by free and immobilized cells of Amycolatopsis mediterranei (1995)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 15 (1995), S. 241-248 
    Details
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The effect of growth conditions (incubation time, inoculum size, initial pH value) and some nutrient concentrations on the growth and rifamycin B and SV production by free and immobilized cells of Amycolatopsis mediterranei CBS 42 575 was studied. In alginate beads, the immobilized cells behaved like the free cells, but a pronounced difference was observed in antibiotic production and cell growth. The rifamycin production by the immobilized cells was higher than that obtained by the free cells. The immobilized cells were also reused repeatedly for six batch cultivations with a fresh medium charged into flasks at the beginning of each batch. It was found that the immobilized cells were stable, and the rifamycin yield was almost constant during the first three batches and then decreased.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370150215
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