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  • 1
    Electronic Resource
    Electronic Resource
    10 km-long fibre-optic remote sensing of CH4 gas by near infrared absorption (1985)
    Springer
    Applied physics 38 (1985), S. 11-15 
    Details
    ISSN: 1432-0649
    Keywords: 42.68 ; 42.80 ; 07.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper reports for the first time the fully optical remote monitoring of low-level CH4 gas with a wide area coverage of 10 km in diameter realized by utilizing ultralowloss silica optical fibre link and a compact absorption cell in conjunction with highly radiant InGaAsP and InGaAs light emitting diodes (LEDs) in the near infrared region. For this novel application, the near-infrared absorption spectra of CH4 molecules were measured and studied involving the ν2+2ν3 combination band around 1.33 μm and the 2ν3 overtone band around 1.66 μm. This fibre-optic system was demonstrated to be feasible and sufficiently sensitive and safe as being a practical CH4 gas remote sensor whose detection sensitivity is normally required to be 25% of the lower explosion limit (LEL) of CH4 gas in air. This result verifies a large potential for applying extensively to various strategic points within the environment, such as industrial and mining complexes as well as urban and residential areas, with considerably increased reability, safety and marketability over the presently available techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00691764
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Purification and properties of β-amylase from Bacillus circulans S31 (1994)
    Springer
    World journal of microbiology and biotechnology 10 (1994), S. 597-598 
    Details
    ISSN: 1573-0972
    Keywords: Amylases ; Bacillus ; enzyme ; maltose ; starch ; thermotolerant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A thermotolerant β-amylase was purified from Bacillus circulans S31 isolated from soil in Hong Kong. The purified enzyme has an M r of 64 kDa and was stable at 50°C and pH 7.0 for 30 min. Its K m for starch was 0.9 mg/ml with a V max of 0.3 mg/min. It was not activated by any metal ion although sulphydrys reagents were inhibitory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00367677
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Production of thermotolerant β-amylase byBacillus circulans (1993)
    Springer
    World journal of microbiology and biotechnology 9 (1993), S. 50-52 
    Details
    ISSN: 1573-0972
    Keywords: β-Amylase ; Bacillus ; soil isolate ; thermotolerant enzyme
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract An isolate from a Hong Kong soil sample which produced β-amylase was identified as a thermotolerant strain ofBacillus circulans with a growth range of 35 to 55δC. The β-amylase was stable at 45°C for 30 min but lost half of its activity after 30 min at 50°C. Maximum specific activity of β-amylase (36.2 units/mg protein) in the culture broth was detected after 36 h of cultivation at 45°C in a medium containing soluble starch, beef extract, coconut water and inorganic salts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00656515
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    Paper (German National Licenses)
    Fulltext
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