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  • 1995-1999  (6)
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Material
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Year
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  • 1
    Electronic Resource
    Electronic Resource
    Co-existing pituitary tumour and intracavernous asymptomatic aneurysm: Management implications (1997)
    Springer
    Acta neurochirurgica 139 (1997), S. 791-792 
    Details
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01420056
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Self-organized growth of ZnTe nanoscale islands on (001)GaAs (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 359-361 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Stransky–Krastanow metalorganic vapor phase epitaxy growth of self-organized ZnTe islands on homoepitaxial (001)GaAs is demonstrated. The −7.4% lattice mismatch of the ZnTe/GaAs heterostructure leads to a strain-driven distribution of nanoscale ZnTe islands on top of a two-dimensionally (2D) grown wetting layer. Atomic force microscopy and Rutherford backscattering spectrometry are used to determine the island dimensions and the thickness of the wetting layer. The density of the islands, their average diameter, and aspect ratio turn out to be about 520 μm−2, 13.6 nm, and 0.20, respectively, for a 1.2 ML thick 2D layer. Furthermore, the average aspect ratio of the islands decreases by increasing the thickness of the wetting layer, as expected by the progressive extinction of the strain-driven island nucleation. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120736
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Growth of ZnTe by metalorganic vapor phase epitaxy: Surface adsorption reactions, precursor stoichiometry effects, and optical studies (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 685-692 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The metalorganic vapor phase epitaxy growth of ZnTe by di-isopropyl-telluride and di-methyl-zinc (Me2Zn) precursors is investigated by studying the epilayer growth rate as a function of both growth temperature and precursor transport rates. The ZnTe growth is a thermally activated process involving the heterogeneous pyrolysis of both Zn and Te alkyls onto the ZnTe surface. The growth rate dependence on growth conditions is explained in terms of surface adsorption-desorption reactions, assuming that the incorporation of Zn and Te atoms into ZnTe takes place through their selective adsorption on different surface lattice sites. There is also evidence that the occurrence of a competitive species for the surface adsorption of Zn atoms, which is identified as the CH3⋅ (methyl) radical, is produced by the pyrolysis of Me2Zn. Photoluminescence (PL) and absorption measurements performed on ZnTe allow to identify two new donor-acceptor pair (DAP) bands, originated from the recombination of a Ga donor with two acceptor centers, whose ionization energies are 56 meV for the higher energy band and around 140–150 meV for the lower energy one. Hall measurements show that the 56 meV acceptor is responsible of the p-type conductivity of the layers. The nature of the impurities originating such PL features is discussed with the support of secondary ion mass spectrometry. It is shown that Ga, Si, and C are dominant impurities in the layers, whereas Cu does not occur in our ZnTe. Unintentional C doping occurs in ZnTe as a consequence of the strong methyl and iso-propyl radical surface adsorption. We show that C is incorporated as an acceptor in ZnTe, originating the DAP bands observed in the PL spectra. Within this view, the 56 meV ionization energy acceptor is tentatively assigned to substitutional C atoms on Te lattice sites. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364208
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  • 4
    Electronic Resource
    Electronic Resource
    Stranski–Krastanow self-organized growth of nano-scale ZnTe islands on (0 0 1)GaAs by metalorganic vapour phase epitaxy (1998)
    Springer
    Journal of materials science 9 (1998), S. 249-253 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The Stranski–Krastanow (SK) growth by atmospheric pressure metalorganic vapour phase epitaxy of self-organized ZnTe nanoislands on homoepitaxial (0 0 1)GaAs is demonstrated. The −7.4% lattice mismatch of the ZnTe/GaAs heterostructure leads to a strain driven distribution of nanoscale ZnTe islands on top of a two-dimensionally (2D) grown wetting layer. Atomic force microscopy and Rutherford backscattering spectrometry are used to determine the island dimensions, the ZnTe mean coverage and the thickness of the 2D wetting layer. The island average density and diameter, as well as their aspect ratio are about 520 μm-2, 13.6 nm and 0.20, respectively, in the case of a 1.20 monolayer (ML) thick wetting layer and a growth rate of 0.074 ML s-1. Preliminary data on the effects of different growth rates on the island average densities are also reported. © 1998 Chapman & Hall
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008890511112
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  • 5
    Electronic Resource
    Electronic Resource
    Production of manganese peroxidase and laccase in laboratory-scale bioreactors by Phanerochaete chrysosporium (1999)
    Springer
    Bioprocess engineering 20 (1999), S. 531-535 
    Details
    ISSN: 0178-515X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The production of ligninolytic enzymes by the fungus Phanerochaete chrysosporium BKM-F-1767 (ATCC 24725) in laboratory-scale bioreactors was studied. One bioreactor was filled with cubes of polyurethane foam and the other with cubes of nylon sponge, in order to determine the more suitable carrier to produce high ligninolytic enzyme activities by this fungus. Both cultivations were carried out in batch. Manganese-dependent peroxidase activities about 600 U l−1 were achieved in the bioreactor filled with cubes of nylon sponge, while up to 500 U l−1 were detected in that filled with cubes of polyurethane foam. Furthermore, quite high levels of laccase appeared in both cultures: maximum activities of 114 U l−1 and 62 U l−1 were obtained on nylon and polyurethane supports, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00009058
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  • 6
    Electronic Resource
    Electronic Resource
    Ligninolytic enzymes from corncob cultures of Phanerochaete chrysosporium under semi-solid-state conditions (1999)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 19 (1999), S. 17-25 
    Details
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The effects of adding some inducers of lignolytic activity to semi-solid-state cultures of Phanerochaete chrysosporium BKM-F-1767 (ATCC 24725) were investigated. The inducers assayed were veratryl alcohol and solid manganese (IV) oxide. The microorganism was cultured on corncob, which functioned both as physical support and source of nutrients.Supplementing the cultures with veratryl alcohol created the situation where manganese-dependent peroxidase (MnP) and lignin peroxidase (LiP) activities of approximately 1,500 U/l and 200 U/l, respectively, could be attained. These activities were considerably higher than those obtained in the reference cultures (about 5 and 4-fold).In the same way, the addition of manganese (IV) oxide led to MnP and LiP activity levels of about 2,000 U/l and 300 U/l, respectively. These activities were also notably above (about 6 and 5-fold, respectively) those achieved in the reference cultures.Moreover, laccase activity (around 200 U/l) was only detected in veratryl alcohol or manganese (IV) oxide supplemented cultures.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370190104
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