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  • 1990-1994  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Gas vesicles are strengthened by the outer-surface protein, GvpC (1992)
    Springer
    Archives of microbiology 157 (1992), S. 229-234 
    Details
    ISSN: 1432-072X
    Keywords: Cyanobacteria ; Gas vesicles ; Protein reassembly ; Anabaena flos-aquae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The critical collapse pressure of gas vesicles isolated from Anabaena flos-aquae decreased from 0.557 to 0.190 MPa when GvpC, the hydrophilic 22 kDa protein present on the outer surface of the gas vesicle, was removed by rising in 6 M urea. Recombinant GvpC was purified from inclusion bodies, produced in an E. coli strain containing an expression vector bearing the gene ecoding GvpC from A. flos-aquae, and then solubilised in 6 M urea. This recombinant GvpC became bound to gas vesicles that had been stripped of their native protein, when the urea was removed by dialysis; the amount which bound increased with the concentration of GvpC present. The critical pressure of these reconstituted gas vesicles increased to 0.533 MPa, 96% of the original value. These results indicate that the function of GvpC is to increase the strength of the structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00245155
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Temperature dependence of the circular magnetic x-ray dichroism in the Invar alloy Fe72Pt28 : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6063-6065 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The method of spin-dependent absorption has been used to examine the temperature dependence of the circular magnetic x-ray dichroism (CMXD) of the (disordered) Invar alloy fcc Fe72Pt28. At the Fe K edge the difference of the transmission for the reversed magnetization direction was determined with an accuracy of 10−5. By comparing the dichroic effects at 110 and at 410 K evidence was found for a temperature-dependent change of the magnetic absorption profile different from the pure amplitude reduction due to the reduced magnetization. It indicates a change of the spin splitting in the low-lying unoccupied p states. The polarization-averaged absorption spectrum shows also a small variation between 4 and 11 eV above the threshold indicating that the p-like electron density drops when the sample is heated. The experimental CMXD profiles are compared with spin-polarized band-structure calculations for ordered Fe3Pt and discussed within the frame of the model of high-spin–low-spin transitions in the Invar regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353470
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    IR spectroscopy on FeNi and FePt Invar alloys : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 7012-7014 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: UHV IR emission spectroscopy has been carried out at energies 9–33 mRy (wavelength 2.8–9.8 μm) in the temperature range 430–800 K on single crystals of FeNi and FePt Invar, with Curie temperatures in the respective range. The results show a drastic (up to 30%) decrease of the IR absorptivity around Tc in the energy range 23–33 mRy (2.8–4 μm), while at small energies around 9 mRy (10 μm) the absorptivity is temperature independent, as expected for 3d metals, and found on pure Ni. The decrease in absorptivity on the Invar alloys cannot be understood by the common temperature dependence of interband transitions; rather, it calls for the existence of moment-volume instabilities, characterized by transitions between a high-spin ground state and a temperature-induced low-spin state. Qualitative agreement of the absorptivity with respective total density-of-states calculations on Fe3Ni is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356760
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Hopanoids of a recent sediment from Lake Constance as eutrophication markers (1993)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 102 (1993), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Bio- and geohopanoid distributions with depth from the upper sediment layers (25 cm) of Lake Constance (Germany) indicate that hopanoid producing bacteria were present in significant amounts either in the water column above the sediment or in the top layer of the sediment. Dihomohopan-32-ol is shown to be representative of the total hopanoid content of the sediment and its distribution is tentatively correlated with the eutrophication process which has occurred in Lake Constance over the past 50 years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1993.tb05813.x
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis and characterization of resorbable dl-lactide-trimethylene carbonate copolyesters (1993)
    Springer
    Journal of materials science 4 (1993), S. 381-388 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Randomized copolyesters of dl-lactide (DLLA) and trimethylene carbonate (TMC) in a wide range of composition were synthesized, analysed and characterized with the aim of assessing their potential benefit in biomedical applications. The chemical composition was analysed using 1H-nuclear magnetic resonance (NMR) spectroscopy. Sequence information was obtained by means of 13C-NMR spectroscopy. From the occurrence of TMC-lactate-TMC triads it is concluded that synthesis by melt copolymerization at 190°C is accompanied by transesterification. The copolymers were characterized by means of differential scanning calorimetry (DSC), tensile testing and accelerated hydrolysis tests at 80°C. Their properties were compared with those of the parent polymers. It was found that all properties under investigation are strongly affected by the molar composition: with increasing TMC moieties the glass transition temperature (T g) is depressed, the tensile strength reduced, the elasticity increased and the in vitro hydrolysis rate decelerated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00122196
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Trace elements in municipal solid waste incinerator fly ash (1993)
    Springer
    Journal of radioanalytical and nuclear chemistry 167 (1993), S. 331-340 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Municipal solid waste incineration (MSWI) significantly reduces volume and mass by as much as 80%, prolonging the life span of landfills. The concentration of heavy metals in the ash and their ability to leach into ground water is a serious concern when siting and designing MSWI ash landfills. Improved technology captures most heavy metals in the ash. The distribution of elements among the different ash particle sizes was determined by NAA. The bottom ash residue was separated into fractions ranging from ≥9.5 mm to ≤0.3 mm. The fly ash was separated into fractions from ≥250 μm to ≤20 μm. Landfills usually bury a mixture of both. The combined ash was separated into fractions over the entire range from 〉9.5 mm to 〈20 μm. Thermal and epithermal neutron irradiations of size fractionated MSW bottom, fly and combined ash were performed to determine the distribution of various metals within the ash. Compared to normal soil, the ashes contained elevated amounts of numerous elements. Concentrations of the more enriched elements (Ag, Cd, Cr, Cu, Hg, Sb, Se, Sr and Zn) in fly ash were of particular interest as source markers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037191
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    Paper (German National Licenses)
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