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  • 1
    Electronic Resource
    Electronic Resource
    Metabolic effects of manganese deficiency in Aspergillus niger: evidence for increased protein degradation (1985)
    Springer
    Archives of microbiology 141 (1985), S. 266-268 
    Details
    ISSN: 1432-072X
    Keywords: Manganese deficiency ; Aspergillus niger ; Citric acid accumulation ; Protein degradation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of manganese deficiency on macromolecule synthesis has been studied in a citric acid producing strain of Aspergillus niger: pulse labelling experiments showed that the synthesis of both protein and RNA was not influenced by the presence of manganese; however, increased protein degradation occurred under manganese deficiency. This was also reflected by the increased activity of an intracellular proteinase activity under these conditions. In replacement cultures addition of inhibitors of RNA, DNA or protein synthesis revealed that only emetine and cycloheximide (which both act at the ribosome) successfully antagonized the adverse effect of manganese ions on citric acid accumulation. Manganese deficiency was also characterized by a decreased portion of polysomes and 80 S ribosomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408070
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  • 2
    Electronic Resource
    Electronic Resource
    Picosecond pulse amplification by wave mixing in GaAs (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1953-1955 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Pulses at 1.064 μm were amplified up to 102 times by nonlinear mixing with a coherent pump wave in GaAs. The observed amplification shows a strong dependence on the intersection angle and time delay between pump and probe pulses. The effect is discussed in terms of self-diffraction by a laser-induced free-carrier grating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101204
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  • 3
    Electronic Resource
    Electronic Resource
    Ab initio calculation of band structure, x-ray emission, quantum yield, and electron-energy-loss spectra of hexagonal boron nitride (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 7422-7426 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The band structure of hexagonal boron nitride (BN) has been calculated using an ab initio linear combination of pseudoatomic-orbitals method. The calculated band structure confirms a previous finding that this material is an indirect band-gap insulator and has two empty interlayer bands. Projected densities of states are compared with the experimental x-ray emission spectra of B and N K edges and the agreement is good. This good agreement between the present ground-state calculation and the experimental x-ray emission spectra supports our previous finding that there should be very little valence electron relaxation effect on x-ray emission spectra. A real-space Green's function technique and the Z+1 approximation have been used to calculate the exciton spectra of B and N K edges. The first peak at 192 eV in B K edge is found to be a bound exciton with a binding energy of 1.7±0.4 eV. Only resonance is found for the N K edge. The calculated exciton spectra agree very well with the experimental quantum-yield and electron-energy-loss spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353983
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  • 4
    Electronic Resource
    Electronic Resource
    Theoretical study of laser heating and dissociation reactions in solids using ultrafast time-resolved x-ray diffraction (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 2174-2178 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theory of ultrafast time-resolved x-ray diffraction is presented. We show that for the case in which vibrational relaxation is fast, the x-ray diffraction intensities in pulse laser heating are determined by the Debye–Waller factor. We also show how the scattering intensities of the diffraction spots change with the position of the dissociating atoms in a time-resolved x-ray diffraction experiment studying dissociation reactions in solids. Our results show that the scattering intensities change in both the fully dissociated and the partially dissociated cases, and that time-resolved x-ray diffraction could be a useful tool in probing dissociation reactions in solids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351607
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of exchange bond disorder on transport measurements : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6510-6512 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the low field resistive anisotropy (LFRA) in amorphous Fe91Zr9 with and without hydrogen loading are presented. The temperature dependence of these data is compared with model calculations of the quadrupolar term [〈〈S2Z〉T〉J−S(S+1)/3], from which it is concluded that the model calculations reproduce both the temperature and the exchange bond dependence of this transport coefficient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356931
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  • 6
    Electronic Resource
    Electronic Resource
    The spontaneous resistive anisotropy in amorphous and hydrogenated FeZr (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5964-5966 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of the spontaneous resistive anisotropy(SRA)—basically the difference between the longitudinal and transverse magnetoresistance extrapolated to zero induction—in amorphous FeZr as a function of field (0–1 T) and temperature (1.5–300 K) are presented. The Fe concentrations investigated range from 89 to 92 at. % and the effects of hydrogenation have also been studied. For the hydrogen-free samples a nonzero SRA develops at the ferromagnetic ordering (Curie) temperature Tc and persists to the lowest attainable temperature, with no obvious anomaly in the vicinity of the proposed transverse-spin freezing temperature Txy. With the inclusion of hydrogen, both Tc and the magnitude of the SRA increase, and attempts are made to correlate such increases with the changes in band structure and mean iron moment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346029
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  • 7
    Electronic Resource
    Electronic Resource
    Theoretical comparison of electron energy-loss and x-ray absorption near-edge fine structure of the Si L2,3 edge (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 288-290 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Various approximations in the calculations of electron energy-loss cross section and x-ray absorption coefficient have been evaluated using the Si L2,3 edge as an example. It was found that the random phase approximation, for which the cross terms are neglected in the expressions of electron energy-loss cross section and x-ray absorption coefficient, is a very good approximation. The dipole approximation in the calculation of the electron energy-loss cross section was found to begin to break down even at small acceptance half angles, such as 12.5 mrad. For energy losses larger than that of the Si L2,3 edge the dipole approximation will break down faster. This approximation also fails for a large scattering angle even at a small energy loss. The electron energy-loss cross section and x-ray absorption coefficient of the Si L2,3 edge has been calculated and compared. The large difference in relative intensity reported experimentally between the two spectra is not confirmed in this study. More experimental comparisons between electron energy loss and x-ray absorption spectra are recommended for Si and other compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347129
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  • 8
    Electronic Resource
    Electronic Resource
    Application of a semiempirical self-consistent-field band calculation to near-edge fine-structure analysis of core-shell electronic absorption edges (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 5217-5220 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A modified parametrization of the complete neglect of the differential overlap molecular orbital method is applied to energy-band calculations of solids. Results of the band calculation are used to calculate the near-edge fine-structure of core-shell electronic absorption edges in electron energy loss spectra. Preliminary application is made to silicon crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343158
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  • 9
    Electronic Resource
    Electronic Resource
    A modified parametrization scheme for the complete neglect of differential overlap method with relativistic correction of orbital exponents and energy levels with particular applications to rare earth compounds (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 4518-4525 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A new unified parametrization scheme for the complete neglect of differential overlap method, applicable to heavy atom systems is formulated. The exponents ζμ and electronegativities X(μ) of atomic orbitals are corrected by the relativistic Dirac–Fock expectation values of atomic orbital radii and energy levels. This leads to the possibility of calibrating the β0 parameters directly by the equilibrium geometric configuration of molecules. The parametrization for hydrogen, halides, and rare earth series, as well as some test calculations for compounds of these elements, have been carried out to show the utility of the scheme. The results demonstrate that the present scheme can give satisfactory MO levels and ionization potentials as well as correct molecular geometry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462813
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  • 10
    Electronic Resource
    Electronic Resource
    The influence of electron-hole density profile on the picosecond time-resolved reflectivity measurement in silicon (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 5031-5034 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of the spatial distribution of electron-hole plasma on reflectivity measurement is studied in this paper. The plasma density deduced from the reflectivity measurement represents the surface density satisfactorily, if the pump penetration depth is not too short compared with probe wavelength. Besides, when plasma resonance does not take place, the probe incident angle should not be close to Brewster's angle [see, for example, M. Born and E. Wolf, Principles of Optics, 6th ed. (Pergamon, New York, 1980), p. 43] for exponential-like plasma density distribution; otherwise, when the phasma resonance takes place, strong nonlinear recombination and diffusion should be present. In other cases, a general applicable method for data processing is suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343177
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