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  • 1
    Electronic Resource
    Electronic Resource
    Methyl ketone formation during degradation of phenoxybutyric acid by Penicillium canescens SBUG-M 1139 (1999)
    Springer
    Archives of microbiology 172 (1999), S. 417-420 
    Details
    ISSN: 1432-072X
    Keywords: Key wordsPenicillium canescens ; Moulds ; Methyl ¶ketones ; Phenoxybutyric acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Penicillium canescens SBUG-M 1139 was shown to be able to grow using phenoxybutyric acid as the sole carbon source. The rapid conversion of the phenoxyalkanoic acid resulted in the formation of phenol, which was metabolized completely. These reactions were accompanied by an accumulation of the methyl ketone phenoxypropan-2-one. Furthermore, during the metabolism of phenoxybutyric acid, 4-phenoxy-2,3-dehydrobutyric acid, 4-phenoxy-3-hydroxybutyric acid, phenoxyacetic acid, and phenoxypropan-2-ol accumulated in minor amounts. Clearly, fungi can metabolize phenoxyalkanoic acids to produce methyl ketones in a manner analogous to that used for the conversion of short- or medium-chain fatty acids by fungi.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050779
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  • 2
    Electronic Resource
    Electronic Resource
    Biodegradation of biphenyl by the ascomycetous yeast Debaryomyces vanrijiae (1998)
    Springer
    Applied microbiology and biotechnology 50 (1998), S. 364-368 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Cells of the yeast strain Debaryomyces vanrijiae SBUG 770, grown with glucose, converted biphenyl to 4-hydroxybiphenyl as the major metabolite. In addition, 2-hydroxybiphenyl was formed in minor amounts. No further degradation of these substances was detected. However, these monohydroxylated derivatives were oxidised by alkane-grown cells in the presence of the co-metabolic substrate, tetradecane. Under these conditions 2-hydroxybiphenyl was oxidised to 2,5-dihydroxybiphenyl, and 4-hydroxybiphenyl was rapidly metabolised by formation of two major metabolites. One was identified as 3,4-dihydroxybiphenyl. Characterisation of the second product as 4-phenylmuconolactone points to a further metabolism of the initially formed dihydroxylated biphenyl via ortho-ring fission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530051305
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  • 3
    Electronic Resource
    Electronic Resource
    Temperature dependent field effect in organic-based thin-film transistor and its spectroscopic character (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 524-531 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The thin field-effect transistor based on amorphous semiconductors, both inorganic or organic, is modeled using an iterative scheme. The results of modeling gave insight into the temperature dependencies of this device. Further, we present the differential procedure, based on the first and higher derivatives of the data, to derive from the field-effect characteristics the basic parameters of the active semiconductor film, i.e., the density of states and field-effect mobility. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370761
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  • 4
    Electronic Resource
    Electronic Resource
    Space-charge-limited-current spectroscopy: Possibilities and limitations (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 1244-1249 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Criteria for space-charge-limited currents to be applied as a spectroscopical method for localized electron states elucidation are examined, namely, density of states, their energy position, and temperature. The "visibility'' of the states is determined by the statistics of the occupation of the injected space charge. The resolving power of the method is increased by decreasing temperature during the experiment. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364445
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  • 5
    Electronic Resource
    Electronic Resource
    Transient space-charge-limited currents: The time-of-flight and post-transit analysis in hydrogenated amorphous silicon (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 3009-3011 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Through evaluation of the post-transit part of the transient space-charge-limited currents (SCLC), it becomes possible to determine the hydrogenated amorphous silicon (a-Si:H) density of localized states (DOS) over a wide range of energies. The use of SCLC conditions results in the enhancement of the occupation of the deep states and hence in the corresponding increase of the signal. In combination with standard SCLC time-of-flight, and since it can be used for both electrons and holes, the method is suitable for the elucidation of the complete DOS distribution, for the examination of the emission times of deep traps, and for the determination of carrier drift mobilities, all on the same p-i-n structure (which may be a standard solar cell).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111387
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  • 6
    Electronic Resource
    Electronic Resource
    Note on electronic gap states in chalcogenide glasses (1978)
    Springer
    Czechoslovak journal of physics 28 (1978), S. 705-708 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01596050
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  • 7
    Electronic Resource
    Electronic Resource
    Space-charge-limited transient photoconductivity in polymers (1999)
    Springer
    Czechoslovak journal of physics 49 (1999), S. 871-882 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Space-charge-limited (SCL) photoconductivity in transient regime and its modification, T-SCLC (transient space-charge-limited currents), are readily observed in high resistivity materials with mobile carriers and thus may be with advantage used as a tool for the study of the density of localized states (DOS) in organic molecular semiconductors. The only prerequisite for the experimental observation of SCL photoconductivity is a reasonably long Maxwell relaxation time. This paper presents the new possibilities of the T-SCLC method for elucidation of the DOS in organic molecular solids with practical examples of modeling, reconstruction of post-transit data and its application for a typical polymer — poly(methylphenylsilylene).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021209728473
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  • 8
    Electronic Resource
    Electronic Resource
    Utilization of phenol by hydrocarbon assimilating yeasts (1988)
    Springer
    Antonie van Leeuwenhoek 54 (1988), S. 179-188 
    Details
    ISSN: 1572-9699
    Keywords: yeasts ; n-octane ; n-hexadecane ; phenol ; coenzyme Q structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract 77 Ascomycetous, basidiomycetous as well as imperfect yeast strains of 46 different species and 20 genera were tested for growth with the substrates n-octane, n-hexadecane, and phenol. Of 59 yeast strains with ascomycetous cell wall structure 33 grew on hydrocarbons and 32 on phenol. No yeast strain out of 26 which are unable to use n-alkanes as a source of carbon and energy grew on phenol. In comparison with the latter 32 out of 33 n-hexadecane assimilating yeasts were also capable of using phenol. All n-octane utilizing yeasts of this group also assimilate phenol as a carbon source for growth. The correlation of the hydrocarbon assimilation with the phenol assimilation seems to be not so strong in the basidiomycetous yeasts. 7 out of 18 strains from this group grew on n-hexadecane and 13 on phenol. Furthermore, it could be shown that the use of hydrocarbons and phenol (as well as methanol) is strongly correlated with the coenzyme Q structure of the respective yeast strain. The results are discussed with respect to the particular chemical properties of the substrates used and the fact that coenzyme Q structure is considered to be an important marker of evolutionary relationships among yeasts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00419204
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  • 9
    Electronic Resource
    Electronic Resource
    Space-charge-limited post transit currents spectroscopy in poly(methylphenylsilylene) (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 7 (1997), S. 61-65 
    Details
    ISSN: 1057-9257
    Keywords: silicon backbone polymers ; transport properties ; transient photoconductivity ; light generation efficiency ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Transient space-charge-limited currents (T-SCLCs) were used as a method for examining drift mobility, recombination and transport mechanisms for a typical poly(silylene), poly(methylphenylsilylene) (PMPSi). It was found that T-SCLCs present a unique possibility for injecting constant charge into a material with strong dependence of the generation efficiency on the electric field strength. This charge is given by space charge limitations and is thus independent of the transport properties of the material. The post-transit T-SCLC hole emission signals from deep traps have been measured using post-transit T-SCLCs. A density-of-electron-states distribution for deep trapping hole states with a tail-like exponential and a Gaussian distribution centred at 0.55 eV were found. © 1997 John Wiley & Sons, Ltd.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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