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  • Articles  (9)
  • Streptomyces  (5)
  • temperature  (4)
  • Lepidoptera
  • Springer  (9)
  • 2000-2004  (9)
  • Process Engineering, Biotechnology, Nutrition Technology  (9)
  • 1
    Electronic Resource
    Electronic Resource
    Production and potential applications of a xylanase from a new strain of Streptomyces cuspidosporus (2000)
    Springer
    World journal of microbiology and biotechnology 16 (2000), S. 257-263 
    Details
    ISSN: 1573-0972
    Keywords: Paper pulp ; poultry feed ; pretreatment ; Streptomyces ; wheat bran ; Xylanase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Enzyme production by a new mesophilic Streptomyces isolate was investigated which grew optimally on 1% (w/v) xylan and 10% (w/v) wheat bran at pH 7 and 37 °C. Xylan induced only CMCase (0.29 U/ml) besides xylanase (22–35 U/ml, 40–49 U/mg protein). Wheat bran induced xylanase (105 U/ml, 17.5 U/mg protein), CMCase (0.74 U/ml), β-xylosidase (0.009 U/ml), β-glucosidase (0.026 U/ml), α-L-arabinofuranosidase (0.049 U/ml), amylase (1.6 U/ml) and phytase (0.432 U/ml). The isolate was amenable to solid state cultivation and produced increased levels of xylanase (146 U/ml, 28 U/mg protein). The pH and temperature optima of the crude xylanase activity were 5.5 and 65 °C respectively. The pI was 6.0 as determined by PEG precipitation. The crude enzyme was applied in treatment of paper pulp and predigestion of poultry feed and was found to be effective in releasing sugars from both and soluble phosphorus from the latter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008945931108
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  • 2
    Electronic Resource
    Electronic Resource
    Studies on anaerobic proteolytic bacteria of Leh, India (2000)
    Springer
    World journal of microbiology and biotechnology 16 (2000), S. 297-301 
    Details
    ISSN: 1573-0972
    Keywords: Anaerobic bacteria ; growth ; protease ; psychrotrophs ; temperature ; volatile fatty acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Five anaerobic proteolytic bacteria were isolated from water bodies of Leh, India, where the ambient temperature varies from −25 to 25 °C. Isolates showed growth at all temperatures ranging from 5 to 37 °C except SPL-4 and SPL-5 which showed no growth at 5 °C. The cultures could grow and produce proteases on various protein substrates and the yield varied with the substrates. Two of the cultures showed the presence of spores. Acetate was the dominant VFA during hydrolysis of protein substrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008935425175
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  • 3
    Electronic Resource
    Electronic Resource
    Chitinolytic actinomycetes from a Brazilian tropical soil active against phytopathogenic fungi (2000)
    Springer
    World journal of microbiology and biotechnology 16 (2000), S. 109-110 
    Details
    ISSN: 1573-0972
    Keywords: Chitinolytic activity ; Streptomyces ; tropical soil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Five Streptomyces spp. isolated from a Brazilian forest soil showed endochitinase activity in the alkaline range with optima between 40 and 50 °C. Three were highly active against three phytopathogenic fungi by in vitro experiments. Preliminary experiments suggested that the isolates may belong to a new taxon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008919009023
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  • 4
    Electronic Resource
    Electronic Resource
    Rubber stoppers used with sulphidic media: a note of caution (2000)
    Springer
    World journal of microbiology and biotechnology 16 (2000), S. 571-572 
    Details
    ISSN: 1573-0972
    Keywords: Anaerobes ; hydrogen sulphide ; rubber stoppers ; sulphate reduction ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Common black rubber stoppers, made from natural rubber and styrene–butadiene, may cause a loss of hydrogen sulphide from aqueous media and impede the growth of sulphate-reducing bacteria under thermophilic conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008909530445
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  • 5
    Electronic Resource
    Electronic Resource
    Preliminary characterization of some Streptomyces species from four Tanzanian soils and their antimicrobial potential against selected plant and animal pathogenic bacteria (2000)
    Springer
    World journal of microbiology and biotechnology 16 (2000), S. 595-599 
    Details
    ISSN: 1573-0972
    Keywords: Animal pathogens ; antibiotics ; antimicrobial activity ; characterization ; plant pathogens ; Streptomyces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract This study was undertaken to characterize Streptomyces strains occurring in some soils of Tanzania as well as to evaluate their potential to synthesize antimicrobial compounds. Six main classes of isolates were observed according to the colour of aerial mycelium. These were gray, cream, blue, pink, red, and white. The gray colour class dominated. About 65% of the isolates produced soluble pigments of various colours while about 33% of the isolates did not produce any soluble pigments. Brown coloured soluble pigments dominated. About 57% of the isolates had spiral spore chains. Some Streptomyces isolates displayed strong (〉 30 mm inhibition zone), moderate (20–30 mm), or weak (〈 20 mm) antibiosis against the plant/animal pathogenic bacteria tested. Other isolates did not show any antibiosis against any of the test pathogens. The plant pathogens CMM IPO 542 (Clavibacter michiganensis ssp. michiganensis) and Xanthomonas vascatoria were inhibited by most of the Streptomyces isolates. Xanthomonas oryzae pv. oryzae and X. campestris were inhibited by the least number of the Streptomyces isolates. Most of the animal pathogens tested seemed to show resistance to the antibiotics produced by some of the Streptomyces isolates which had shown high activity against the plant pathogens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008916418258
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of temperature, water activity and gas atmosphere on mycelial growth of tempe fungi Rhizopus microsporus var. microsporus and R. microsporus var. oligosporus (2000)
    Springer
    World journal of microbiology and biotechnology 16 (2000), S. 853-858 
    Details
    ISSN: 1573-0972
    Keywords: Carbondioxide ; fungi ; oxygen ; Rhizopus ; solid-substrate fermentation SSF ; tempe modelling ; temperature ; water activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Rhizopus microsporus var. microsporus and var. oligosporus are used in the manufacture of various Asian fermented foods (tempe, black oncom, sufu). In view of solid-substrate fermentation (SSF) control, mycelial growth of strains of both varieties was tested for sensitivity to fluctuations of temperature, water activity and interstitial gas composition. This was achieved by measuring radial growth as well as biomass dry weight of pre-germinated microcolonies on defined media. The optimum conditions were temperature 40 °C, a w 0.995 and a gas composition of air for the growth of both strains on a model medium. Whereas radial growth rates of var. microsporus and var. oligosporus were similar, biomass growth rates of var. oligosporus were higher than those of var. microsporus under optimum conditions. The temperature-dependent growth of Rhizopus spp. at a w 〉 0.98 could be described by the Ratkowsky Equation. Carbon dioxide (5–10% v/v) inhibited the growth of Rhizopus spp. at non-limiting levels of oxygen. The two strains were able to grow at low (0.5% v/v) oxygen levels, but the mycelial density was rather low. No interrelation of water activity and gas composition was observed, but at high water activity the fungi were more sensitive to changes of temperature. The implications for process control are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008974621698
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  • 7
    Electronic Resource
    Electronic Resource
    Activity of North Jordan soil streptomycete isolates against Candida albicans (2000)
    Springer
    World journal of microbiology and biotechnology 16 (2000), S. 139-142 
    Details
    ISSN: 1573-0972
    Keywords: Activity ; Candida albicans ; Streptomyces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Eighteen percent of 116 different isolates of Streptomyces recovered from soils of northern Jordan showed activity against Candida albicans. The recovered isolates were distributed into three groups according to the diameter of the inhibition zone on the agar plate: group 1 (5–10 mm, slightly active); group 2 (11–15 mm, moderately active); and group 3 (16–35 mm, highly active). Isolates of group 3 were further grouped into four sub-groups and were culturally and morphologically identified. The u.v. spectra of the fermentation broth for the isolates in sub-group 4 were determined, and showed absorbance peaks ranging between 230 and 300 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008955728804
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of amino acids on production of xylanase and pectinase from Streptomyces sp. QG-11-3 (2000)
    Springer
    World journal of microbiology and biotechnology 16 (2000), S. 211-213 
    Details
    ISSN: 1573-0972
    Keywords: Amino acids ; pectinase ; Streptomyces ; xylanase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Xylanase and pectinase production by Streptomyces sp. QG-11-3 was stimulated by DL-norleucine, L-leucine, DL-isoleucine, L-lysine monohydrochloride and DL-β-phenylalanine by up to 3.72- and 2.78-fold, respectively, whereas the combination of DL-norleucine, L-leucine and DL-isoleucine synergistically stimulated the xylanase and pectinase production by up to 6.72- and 5.62-fold, respectively. Glycine, DL-norvaline, DL-methionine, and DL-aspartic acid showed no significant stimulatory effect on enzyme production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008979512413
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  • 9
    Electronic Resource
    Electronic Resource
    Patulin and aflatoxin in brown rot lesion of apple fruits and their regulation (2000)
    Springer
    World journal of microbiology and biotechnology 16 (2000), S. 607-612 
    Details
    ISSN: 1573-0972
    Keywords: Aflatoxin ; apple ; fruit oils ; fungi ; patulin ; sodium hypochlorite ; temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Aspergillus flavus, A. niger, Penicillium expansum and Rhizopus stolonifer were the most frequently isolated fungi from healthy apple fruits. Alternaria alternata was the most common organism of rotten apple fruits, followed by A. niger, A. flavus, P. expansum and R. stolonifer. The prevalent type of decay, brown rot lesion, is caused by R. stolonifer followed by A. flavus, A. niger, A. alternata and P. expansum. Sodium hypochlorite had good curative properties against fruit rots. The main natural mycotoxins produced in rotten apple were patulin and aflatoxins. The optimum temperature for patulin production by P. expansum was 15 °C after 15 days. Complete inhibition of patulin formation was attained using 0.2% lemon oil and 〉 90% inhibition using 0.05% lemon and 0.2% orange oils. Also significant inhibition (〉 90%) of aflatoxin production was observed with 0.2% lemon oil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008982511653
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