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  • 1
    Electronic Resource
    Electronic Resource
    The localization of trehalase in polyacrylamide gels with eugenol by a coupled enzyme assay
    Amsterdam : Elsevier
    Analytical Biochemistry 106 (1980), S. 367-372 
    Details
    ISSN: 0003-2697
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0003-2697(80)90534-5
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  • 2
    Electronic Resource
    Electronic Resource
    Optical and photoelectrical properties of β-FeSi2 thin films (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 4793-4795 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Absorption, photocurrent, and infrared reflectivity spectra of the polycrystalline β-FeSi2 thin films in relation to the Si substrate temperature are presented. The photocurrent spectra involving both the fundamental interband, extrinsic defect transitions of β-FeSi2 and the intrinsic transitions of Si substrates are observed. Both the absorption and photocurrent measurements show the direct gap nature. A simple recombination model is proposed to account for the photocurrent results. We show that better quality β-FeSi2 films can be achieved at higher substrate temperature. The simplicity, sensitivity, and reliability of the photocurrent measurements for studying β-FeSi2 are well demonstrated. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359761
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  • 3
    Electronic Resource
    Electronic Resource
    Comparison of the k⋅p and direct diagonalization approaches to the electronic structure of InAs/GaAs quantum dots (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 339-341 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a comparison of the 8-band k⋅p and empirical pseudopotential approaches to describing the electronic structure of pyramidal InAs/GaAs self-assembled quantum dots. We find a generally good agreement between the two methods. The most significant differences found in the k⋅p calculation are (i) a reduced splitting of the electron p states (3 vs 24 meV), (ii) an incorrect in-plane polarization ratio for electron-hole dipole transitions (0.97 vs 1.24), and (iii) an over confinement of both electron (48 meV) and hole states (52 meV), resulting in a band gap error of 100 meV. We introduce a "linear combination of bulk bands" technique which produces results similar to a full direct diagonalization pseudopotential calculation, at a cost similar to the k⋅p method. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.125747
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  • 4
    Electronic Resource
    Electronic Resource
    Electronic structure induced by lateral composition modulation in GaInAs alloys (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 2144-2146 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It has been recently shown that growth of [001]-oriented short period (AC)n/(BC)n vertical superlattices (n∼1−2) spontaneously creates a lateral composition modulation in the substrate plane ([110] direction), where wire-like AC-rich and BC-rich domains alternate with a period of ∼100−200 Å. This creates a new type of lattice structure with orthogonal [001] and [110] strain fields and compositional waves. Using a three-dimensional plane-wave pseudopotential approach, we study here the electronic properties of this type of structure in a GaInAs alloy, predicting valence band splittings into distinctly polarized components, a ≤100 meV band-gap reduction and strong, type I electron and hole confinement in the In-rich lateral channels. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121303
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  • 5
    Electronic Resource
    Electronic Resource
    Spectrophotometric determination of polar and non-polar lipids in oleaginous yeast (1993)
    Springer
    World journal of microbiology and biotechnology 9 (1993), S. 350-352 
    Details
    ISSN: 1573-0972
    Keywords: Candida curvata ; gravimetric ; lipids ; oleaginous yeast ; spectrophotometric
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A spectrophotometric method of determining extractable lipids was compared with a gravimetric method to estimate intracellular polar and non-polar lipids in the oleaginous yeast, Candida curvata. The methods correlated well but the spectrophotometric method was simpler, required less sample, and its accuracy was not affected by non-lipid components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00383078
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of oxidized surface layers on the inner core of fine iron particles (1992)
    Springer
    Hyperfine interactions 68 (1992), S. 373-376 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mössbauer measurements on fine iron particles with the size ranging from 150 to 350 Å with oxidized surface layer are carried out between 81 and 300K. The spectra consist of two components, a component due to metallic iron and a second component with a larger hyperfine field. The thickness of the oxide surface layer calculated from the area ratio of the subspectra is about 19 Å, and is independent of the average diameter of the particles. A slight enhancement of the hyperfine field of the iron core with a decrease of particle size has been observed. It results from the contribution of the atoms at the interface layer and the dipole interaction between the particles. The dipole interaction decreases owing to the effects of the oxide surface layer on the dipole field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02396513
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