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  • 1
    Electronic Resource
    Electronic Resource
    Antimutagenic unusual amino acids from plants (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 1622-1623 
    Details
    ISSN: 1420-9071
    Keywords: Antimutagens ; natural product ; unusual amino acids ; isolation and structural determination ; Liliaceae ; Sapindaceae ; Salmonella typhimurium TA100
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Five unusual amino acids were identified as antimutagens against spontaneous mutation ofSalmonella typhimurium TA100: L-azetidine-2-carboxylic acid (1) from Liliaceae plants, α-(methylenecyclopropyl)glycine (2) fromLitchi chinensis seeds, and 2-amino-4-methylhex-5-ynoic acid (3), hypoglycin A (4), and (2S, 4R)-2-amino-4-hydroxyhept-6-ynoic acid (5) fromEuphoria longana seeds. The absolute stereochemistry of5 was determined by its chiral synthesis from L-allylglycine, proving that5 is the C-4 epimer of the amino acid previously isolated from dried longan seeds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01964840
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  • 2
    Electronic Resource
    Electronic Resource
    Magnon-assisted luminescence in antiferromagnetic manganese carbonate (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 902-905 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Strong luminescence observed at a low temperature in the antiferromagnetic MnCO3 disappears near the phase transition temperature. It is interpreted as the emission composed of multimagnon and multi-magnon-phonon sidebands associated with a pure electronic transition between 6A1g and 4T1g states of manganese ions. Polarization experiments of the fine structure in this red emission reveal that two kinds of radiative traps participate in the transitions. The integrated intensity of the luminescence is measured as a function of temperature and discussed in terms of a three-level model in which the energy transfer from an intrinsic exciton to impurity-induced levels plays an important role.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336162
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  • 3
    Electronic Resource
    Electronic Resource
    First-order Raman scattering in MgO microcrystals (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 973-975 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Raman scattering is observed in MgO microcrystals with three different particle sizes (105, 103, and 102 A(ring)). The second-order Raman lines in the bulk crystals of MgO disappear in all the microcrystals, while new peaks emerge at 280, 446, and 1088 cm−1 except for specimen prepared by grinding a large single crystal. Raman lines with lower frequencies, which are enhanced with decrease of the particle size, are discussed as due to the first-order Raman scattering forbidden in the bulk crystals. The assignment is confirmed in terms of photon density of states in microcrystals. Another line with the highest frequency is coincident with a previously reported Raman line whose origin has been attributed to a surface phonon mode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334701
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    Paper (German National Licenses)
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