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  • 1
    Electronic Resource
    Electronic Resource
    Sn"1"-"xFe"xO"y: a new material with high carbon monoxide sensitivity
    Amsterdam : Elsevier
    Sensors and Actuators B: Chemical 20 (1994), S. 163-167 
    Details
    ISSN: 0925-4005
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0925-4005(94)01194-X
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Aerobic dechlorination of low-chlorinated biphenyls by bacterial biofilms in packed-bed batch bioreactors (1996)
    Springer
    Applied microbiology and biotechnology 45 (1996), S. 562-568 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Cells of an aerobic three-membered bacterial co-culture, designated as ECO3, capable of cometabolizing and aerobically dechlorinating low-chlorinated biphenyls in the presence of biphenyl, were immobilized on Manville silica beads, on frosted-glass beads and on polyurethane foam cubes in packed-bed bioreactors continuously fed with a biphenyl-saturated air stream. The ECO3 biofilm reactors were found to be capable of extensively mineralizing several pure dichlorobiphenyls (75 mg/l) and Aroclor 1221 (75 mg/l) in batch mode. Immobilized ECO3 cells could aerobically degrade and dechlorinate the dichlorobiphenyls tested more extensively than suspended ECO3 cells. Among the three biofilm reactors, the glass bead bioreactor and the polyurethane bioreactor exhibited the highest capability of mineralizing both dichlorobiphenyls and Aroclor 1221; the polychlorinated biphenyl availability in the bioreactors, more than the biomass availability, both depending on the nature of the support employed, significantly governed the efficiency of the treatment. These results are of interest for the possible development of a bioreactor system for continuous treatment of polychlorinated-biphenyl-contaminated wastewaters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00578472
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Aerobic mineralization of chlorobenzoates by a natural polychlorinated biphenyl-degrading mixed bacterial culture (1993)
    Springer
    Applied microbiology and biotechnology 40 (1993), S. 541-548 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A natural mixed aerobic bacterial culture, designated MIXE1, was found to be capable of degrading several low-chlorinated biphenyls when 4-chlorobiphenyl was used as a co-substrate. MIXE1 was capable of using all the three monochlorobenzoate (CBA) isomers tested as well as 2,5-, 3,4- and 3,5-dichlorobenzoate (dCBA) as the sole carbon and energy source. During MIXE1 growth on these substrates, a nearly stoichiometric amount of chloride was released: 0.5 g/l of each chlorobenzoate was completely mineralized by MIXE1 after 2 or 3 days of culture incubation. Two strains, namely CPE2 and CPE3, were selected from MIXE1: CPE2, referred to the Pseudomonas genus, was found to be capable of totally degrading both 2-CBA and 2,5-dCBA, whereas Alcaligenes strain CPE3 was capable of mineralizing 3-, 4-CBA and 3,4-dCBA. Substrate uptake studies carried out with whole cells of strain CPE2 suggested that 2-CBA was metabolized through catechol, while 2,5-dCBA was degraded via 4-chlorocatechol. 3-CBA, 4-CBA, and 3,4-dCBA appeared to be degraded through 3,4-dihydroxybenzoate by the CPE3 strain. MIXE1, which is capable of degrading several chlorobenzoates, should therefore be able to mineralize a number of low-chlorinated congeners of simple and complex polychlorinated biphenyl mixtures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00175746
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Aerobic dechlorination of low-chlorinated biphenyls by bacterial biofilms in packed-bed batch bioreactors (1996)
    Springer
    Applied microbiology and biotechnology 45 (1996), S. 562-568 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  Cells of an aerobic three-membered bacterial co-culture, designated as ECO3, capable of cometabolizing and aerobically dechlorinating low-chlorinated biphenyls in the presence of biphenyl, were immobilized on Manville silica beads, on frosted-glass beads and on polyurethane foam cubes in packed-bed bioreactors continuously fed with a biphenyl-saturated air stream. The ECO3 biofilm reactors were found to be capable of extensively mineralizing several pure dichlorobiphenyls (75 mg/l) and Aroclor 1221 (75 mg/l) in batch mode. Immobilized ECO3 cells could aerobically degrade and dechlorinate the dichlorobiphenyls tested more extensively than suspended ECO3 cells. Among the three biofilm reactors, the glass bead bioreactor and the polyurethane bioreactor exhibited the highest capability of mineralizing both dichlorobiphenyls and Aroclor 1221; the polychlorinated biphenyl availability in the bioreactors, more than the biomass availability, both depending on the nature of the support employed, significantly governed the efficiency of the treatment. These results are of interest for the possible development of a bioreactor system for continuous treatment of polychlorinated-biphenyl-contaminated wastewaters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00578472
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Degradation and dechlorination of low-chlorinated biphenyls by a three-membered bacterial co-culture (1994)
    Springer
    Applied microbiology and biotechnology 41 (1994), S. 117-123 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract. A Pseudomonas sp. strain, designated CPE1, was found to be capable of completely mineralizing 4-chlorobiphenyl via 4-chlorobenzoate and of partially dechlorinating 3,4′-dichlorobiphenyl in the presence of biphenyl. A three-membered bacterial consortium, designated ECO3, prepared by combining CPE1 with two chlorobenzoate (CBA)-degrading strains, was capable of extensively degrading and dechlorinating all the monochlorinated biphenyls and several dichlorinated biphenyls in the presence of biphenyl. Both CPE1 and ECO3 were capable of co-metabolizing several low-chlorinated biphenyl congeners of Fenclor 42 in the presence of biphenyl; however, only in ECO3 cultures were high degradation rates and chloride release observed. The higher rate of degradation and mineralization of some polychlorinated biphenyls (PCBs) of Fenclor 42 due to the concerted action of ECO3 members both on PCBs and CBAs suggested that the removal of CBAs from the culture medium may favour PCB degradation, and, therefore, that CBAs may be involved in the regulation of the degradation process of several chlorinated biphenyl congeners.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00166092
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    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Degradation and dechlorination of low-chlorinated biphenyls by a three-membered bacterial co-culture (1994)
    Springer
    Applied microbiology and biotechnology 41 (1994), S. 117-123 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A Pseudomonas sp. strain, designated CPE1, was found to be capable of completely mineralizing 4-chlorobiphenyl via 4-chlorobenzoate and of partially dechlorinating 3,4′-dichlorobiphenyl in the presence of biphenyl. A three-membered bacterial consortium, designated ECO3, prepared by combining CPE1 with two chlorobenzoate (CBA)-degrading strains, was capable of extensively degrading and dechlorinating all the monochlorinated biphenyls and several dichlorinated biphenyls in the presence of bipheny. Both CPE1 and ECO3 were capable of co-metabolizing several low-chlorinated biphenyl congeners of Fenclor 42 in the presence of biphenyl; however, only in ECO3 cultures were high degradation rates and chloride release observed. The higher rate of degradation and mineralization of some polychlorinated biphenyls (PCBs) of Fenclor 42 due to the concerted action of ECO3 members both on PCBs and CBAs suggested that the removal of CBAs from the culture medium may favour PCB degradation, and, therefore, that CBAs may be ivollved in the regulation of the degradation process of several chlorinated biphenyl congeners.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00166092
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Nucleation and crystal growth in a fly ash derived glass (1993)
    Springer
    Journal of materials science 28 (1993), S. 6591-6594 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The devitrification behaviour of a fly ash derived glass, examined by differential thermal analysis (DTA), X-ray diffraction and scanning electron microscopy (SEM), is reported and discussed. The crystallized phases were identified as mullite (3Al2O3·2SiO2) and anorthite (CaO·Al2O3·2SiO2). Kinetic parameters for nucleation and crystal growth were estimated from the DTA curves. The temperature of maximum nucleation rate was 790°C and the activation energy for crystal growth E=370 kJ mol−1. The crystal morphology was investigated by SEM and the crystal shape found to be consistent with the morphological index n calculated by DTA. The glass-ceramic obtained from a previously nucleated glass showed a fine-grained texture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00356400
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    Paper (German National Licenses)
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