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  • 1
    Electronic Resource
    Electronic Resource
    Photoluminescence and x-ray photoelectron spectroscopy study of S-passivated InGaAs(001) (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 3076-3082 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of sulfur passivation on the surface composition of In0.53Ga0.47As(001) was investigated with photoluminescence (PL) and x-ray photoelectron spectroscopy (XPS). Films of In0.53Ga0.47As(001), epitaxially grown on InP(100) substrates, were S passivated using a dry electron cyclotron resonance (ECR)-plasma deposition process and were either passivated as-prepared, or exposed to a BCl3 pre-etch prior to passivation. In the spectral range from 1450 to 1750 nm, S passivation enhances the PL yield by approximately an order of magnitude. XPS shows that S binds both to In and As, although preferably to In, and that oxidation is essentially eliminated by the passivation process. The In–S bonds are more stable upon annealing than are the As–S bonds. Furthermore, the pre-etched+H2S treatment enhances the PL yield beyond that of the H2S passivation treatment alone and produces a higher ratio of In–S to As–S bonds at the surface. In a second set of experiments, the influence of the ECR power applied to the sample during passivation was examined. The variation of this processing parameter has little effect on the surface composition. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363130
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  • 2
    Electronic Resource
    Electronic Resource
    Atomically resolved structure of InAs quantum dots (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 2309-2311 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: InAs was grown by molecular-beam epitaxy onto GaAs(001) until quantum dots (QDs) formed. At this point, the growth was interrupted and the uncovered QDs were investigated in situ by scanning tunneling microscopy (STM). Atomically resolved STM images of the QDs revealed that four dominating bounding facets occur, whose Miller indices were identified to be {137}. The assignment of the facet orientation was based on experiments on planar high Miller index GaAs surfaces. In addition, the latter experiments indicated that {137} facets are thermodynamically stable only up to a certain size. This conclusion is assumed to explain the sharp size distribution of InAs QDs. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1365101
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  • 3
    Electronic Resource
    Electronic Resource
    Biological denitration of propylene glycol dinitrate by Bacillus sp. ATCC 51912 (1996)
    Springer
    Applied microbiology and biotechnology 45 (1996), S. 525-529 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  In previous studies, bacterial cultures were isolated that had the ability to degrade the nitrate ester glyceryl trinitrate (i.e. nitroglycerin). The goal of the present study was to examine the ability of resting cells and cell-free extracts of the isolate Bacillus sp. ATCC 51912 to degrade the more recalcitrant nitrate ester propylene glycol dinitrate (PGDN). It was observed that the PGDN-denitrating activity was expressed during growth even when cells were cultured in the absence of nitrate esters. This indicates that nitrate esters are not required for expression of denitration activity. Using cell-free extracts, PGDN was observed to be sequentially denitrated to propylene glycol mononitrate (PGMN) and propylene glycol with the second denitration step proceeding more slowly than the first. Also it was observed that dialysis of the cell-free extracts did not affect denitration activity indicating that regenerable cofactors [e.g. NAD(P)H or ATP] are not required for denitration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00578466
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  • 4
    Electronic Resource
    Electronic Resource
    Biological denitration of propylene glycol dinitrate byBacillus sp. ATCC 51912 (1996)
    Springer
    Applied microbiology and biotechnology 45 (1996), S. 525-529 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract In previous studies, bacterial cultures were isolated that had the ability to degrade the nitrate ester glyceryl trinitrate (i.e. nitroglycerin). The goal of the present study was to examine the ability of resting cells and cell-free extracts of the isolateBacillus sp. ATCC 51912 to degrade the more recalcitrant nitrate ester propylene glycol dinitrate (PGDN). It was observed that the PGDN-denitrating activity was expressed during growth even when cells were cultured in the absence of nitrate esters. This indicates that nitrate esters are not required for expression of denitration activity. Using cell-free extracts, PGDN was observed to be sequentially denitrated to propylene glycol mononitrate (PGMN) and propylene glycol with the second denitration step proceeding more slowly than the first. Also it was observed that dialysis of the cell-free extracts did not affect denitration activity indicating that regenerable cofactors [e.g. NAD(P)H or ATP] are not required for denitration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00578466
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  • 5
    Electronic Resource
    Electronic Resource
    Putrescine metabolism: Enzymatic formation and non-enzymatic isotope exchange of Δ′-pyrroline (1984)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 11 (1984), S. 118-120 
    Details
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The deamination of putrescine catalysed by diamine oxidase was carried out in deuterium oxide and deuterated buffers. Enamine and α,β-unsaturated intermediates were excluded, based on the observation that deuterium was not incorporated into Δ1-pyrroline during its enzymatic formation in deuterium oxide. When the reaction mixture was buffered with phosphate, isolated Δ1-pyrroline contained two deuterium atoms at C-3, indicating that a phosphate-promoted, non-enzymatic isotope exchange had occurred. Using 5,5-dimethyl-Δ1-pyrroline as a model compound, the nature of the non-enzymatic deuterium exchange was studied and a bifunctional catalysis mechanism proposed. The results suggest that the choice of buffer could alter the conclusions drawn from enzyme mechanism studies involving imine-enamine tautomerism.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200110305
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