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  • 1990-1994  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Influence of Te concentration on the infrared cathodoluminescence of GaAs:Te wafers (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 2776-2779 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Cathodoluminescence (CL) scanning electron microscopy has been used to investigate the nature and distribution of defects involved in the infrared emission of GaAs:Te wafers. Spectral and CL-contrast changes as a function of doping level have been found. Profiles of infrared CL intensity across the wafers show an inverted U shape.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348636
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Spatial distribution of recombination centers in GaAs:Te: Effects of the doping level (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 987-992 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The distribution in liquid-encapsulated-Czochralski (LEC) GaAs:Te wafers of point and complex defects has been investigated together with their influence on the minority-carrier diffusion length L. Three wafers with different Te-doping concentration (2.2×1017, 4.5×1017, and 1.5×1018 cm−3) have been studied by means of the electron-beam-induced-current (EBIC) mode of scanning electron microscopy and of the surface photovoltage (SPV) method. The morphology and electrical activity of the defects observed across each wafer have been correlated to the formation and distribution of deep electronic levels, which are significantly affected by the tellurium concentration. The diffusion length has been found to be mainly controlled by deep levels associated with dislocations. EBIC localized measurements of L and of the net ionized free-carrier concentration provide evidence for the influence of Te concentration on impurity segregation at complex defects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357783
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Application of scanning electron acoustic microscopy to the characterization of n-type and semi-insulating GaAs (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 1357-1359 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of GaAs wafers with different doping levels and electrical resistivity has been used to investigate the scanning electron acoustic microscopy (SEAM) application to the characterization of this material. It has been found that SEAM is particularly useful to characterize semi-insulating GaAs as compared with n-type material. The SEAM signal generation mechanisms in GaAs are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107485
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Conjugal transfer of enterococcal transposons in Bacillus megaterium (1994)
    Springer
    World journal of microbiology and biotechnology 10 (1994), S. 673-676 
    Details
    ISSN: 1573-0972
    Keywords: Bacillus megaterium ; conjugative transposons ; Tn916 ; Tn919
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The conjugative enterococcal transposons Tn916 and Tn919 were introduced into Bacillus megaterium by a filtermating technique. The transfer frequencies obtained ranged from 1.3×10-6 to 6.6×10-7. The transposons integrated stably into the B. megaterium chromosome. Tn916 could generate auxotrophs and was transferred from B. megaterium Tn916 transconjugants to other species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00327957
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Screening and selection of bacteria with high amylolytic activity (1993)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 13 (1993), S. 197-201 
    Details
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: 515 microorganisms of the genus Bacillus which produce starch-degrading enzymes were isolated from natural environments in the course of a screening programme. Treating the Bacillus strains on agar plates with iodine reagent for 30 seconds led to the selection of clones with increased amylolytic activity. This methods is very convenient for the screening of large numbers of amylolytic strains.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370130220
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    Paper (German National Licenses)
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