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  • 23.20  (3)
  • 25.70  (2)
  • 3-Hydroxy fatty acids  (2)
  • 42.55G  (2)
  • 61.80  (2)
  • Springer  (10)
  • American Chemical Society
  • 1985-1989  (10)
Collection
Keywords
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  • Springer  (10)
  • American Chemical Society
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Verification of a XeCl* laser model by measurement of the plasma conductivity (1988)
    Springer
    Applied physics 47 (1988), S. 333-342 
    Details
    ISSN: 1432-0649
    Keywords: 42.55G ; 52.65 ; 52.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of current, voltage, and laser emission of an X-ray preionized selfsustained XeCl* laser discharge using Ne:Xe:HCl gas mixtures are compared with predictions of spatially homogeneous model calculations. As a prerequisite an accurate and detailed model of the electrical circuit is developed. For current and voltage measurements electro-optical methods are used. Corrections to the measurements and the reliability of the final data are discussed in detail. Using collision cross sections from the recent literature and stepwise vibrational excitation of HCl up tov=3 reproduces the electrical conductivities measured in a large field of parameters. The reliability and numerical stability of the model calculations depend on the way in which the e-HCl collision terms of the Boltzmann equation and the e-HCl collision rates are evaluated. The predicted total laser pulse energies are too small, but the shape and timing of the pulse correspond to the experimental values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00716095
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  • 2
    Electronic Resource
    Electronic Resource
    Spectroscopic investigation of the ionization kinetics in XeCl laser discharges by Xe* density measurements (1989)
    Springer
    Applied physics 48 (1989), S. 73-84 
    Details
    ISSN: 1432-0649
    Keywords: 42.55G ; 52.65 ; 52.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Time and spatially resolved absorption measurements of Xe* particle number densities performed at an X-ray preionized self-sustained XeCl*-laser discharge were used to investigate the reaction kinetics of such discharges and to test the validity of the commonly-made assumption that they are fit well by spatially homogeneous numerical models. It turned out that the Xe* density distribution over the discharge cross section remains homogeneous for less than 100 ns only. Comparing the experimental results of the homogeneous discharge phase with zero-dimensional model calculations, we conclude that induced emission modeled using two excited xenon levels must be taken into account for the quantitative interpretation of the absorption measurements. For the interpretation of the Xe 6s′-6p′ absorption measurements even a multilevel model will be necessary. Further we conclude from the relative courses and the absolute values of the Xe* particle number densities that realistic HCl kinetics should contain three vibrationally excited levels and stepwise excitation processes as proposed by Dem'yanov et al. [8].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694421
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  • 3
    Electronic Resource
    Electronic Resource
    Heavy-ion-induced desorption of deuterium from titanium (1987)
    Springer
    Applied physics 42 (1987), S. 19-33 
    Details
    ISSN: 1432-0630
    Keywords: 61.80 ; 66.30 ; 79.20N
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A titanium-layer of approximately 90 nm thickness has been homogeneously loaded with deuterium by implantation and diffusion. Desorption was studied by use of28Si ions of up to 20 MeV energy (and other ions). The spectrum of the elastic-recoil-detection method serves as indication of the released and retained amount of deuterium. The retained deuterium is recorded as a function of the employed ion dose and is converted into a desorption rate as a function of the retained deuterium concentration. — A one-dimensional theory considering transitions from vacuum to surface and surface to Ti volume (and back) leads to a system of equations, the solutions of which allow adaptation to the experiment and therefore an evaluation with respect to certain characteristic parameters. — Some of the results might be influenced by the high concentration of C and O impurities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618155
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  • 4
    Electronic Resource
    Electronic Resource
    Heavy-ion induced desorption of deuterium from titanium (1987)
    Springer
    Applied physics 42 (1987), S. 179-192 
    Details
    ISSN: 1432-0630
    Keywords: 61.80 ; 66.30 ; 79.20N
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The model used in the first part of this investigation is enlarged to take account of the experimentally found inhibition of desorption by gases from the rest-gas atmosphere of the target chamber. The main parameters that can be found by adaptation of a model set of equations are the rate ratios for transfer of chemisorbed atoms in the surface and back, and of the maximal desorption current densities from the surface into the vacuum for deuterium and foreign gases. The desorption cross sections are discussed in relation to the electronic stopping power of the fast ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620597
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  • 5
    Electronic Resource
    Electronic Resource
    Structural analyses of lipid A from lipopolysaccharides of nodulating and non-nodulating Rhizobium trifolii (1985)
    Springer
    Archives of microbiology 141 (1985), S. 284-289 
    Details
    ISSN: 1432-072X
    Keywords: Rhizobium trifolii ; Lipopolysaccharide ; Lipid A-structure ; “Nod” plasmids ; 3-Hydroxy fatty acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Structural studies have been performed on lipid A preparations derived from lipopolysaccharides of nodulating (nod+) Rhizobium trifolii wild type strains and non-nodulating (nod-) mutants deprived of the medium size “Nod” plasmid. All preparations contain a lipid A backbone composed of a β1,6-linked d-glucosamine disaccharide (GlcN II-β1,6-GlcN I) which is bis-phosphorylated at positions 1 and 4′. The phosphate group at position 4′ (GlcN II) is nonstoichiometrically substituted probably by a neutral glycosyl residue. Another substituent (probably also a neutral sugar) substitutes partly position 4 (GlcN I) of the disaccharide. The hydroxyl groups at positions 3 and 3′ are likely to be esterified by fatty acyl residue. In lipid A of nod+ strains, 3-hydroxyhexa- and octadecanoic acid are linked to the amino group of GlcN I, and 3-hydroxyhexa- and tetradecanoic acid to the amino group of GlcN II. In lipid A of nod- strains, mainly 3-hydroxyhexadecanoic acid is linked to the amino group of GlcN I, and 3-hydroxytetra- and hexadecanoic acid to that of GlcN II. The results show that rhizobial lipid A expresses many similarities to the lipid A of Enterobacteria. The structure shows, however, also peculiarities, especially regarding substituents of the lipid A backbone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00428838
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  • 6
    Electronic Resource
    Electronic Resource
    Nature and linkage type of fatty acids present in lipopolysaccharides of phase I and II Coxiella burnetii (1985)
    Springer
    Archives of microbiology 142 (1985), S. 6-11 
    Details
    ISSN: 1432-072X
    Keywords: Coxiella burnetii ; Lipopolysaccharide ; Endotoxin ; Lipid A ; Fatty acids ; 3-Hydroxy fatty acids ; 3-Acyloxyacyl residues
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The constituent fatty acids of lipopolysaccharides (LPS) of Coxiella burnetii (phase I and II) were qualitatively and quantitatively analysed by combined gas-liquid chromatography/mass spectrometry. The total fatty acid content (per mg LPS) was determined as 90.0 nmol (2.3 wt%) for LPS of phase I cells (LPS I) and 179.1 nmol (4.8 wt%) for LPS of phase II cells (LPS II). Of the 24 different acyl residues characterized (12 to 18 carbon atoms), nine were 3-hydroxy fatty acids (normal, iso- and anteiso-branched) which quantitatively predominated. All 3-hydroxylated fatty acids were found to possess the (R)-configuration, to be exclusively amide-linked and to be acylated at their 3-hydroxyl group. Ester-linked nonhydroxylated fatty acids (normal, iso- and anteiso-branched) were present but esterbound 3-hydroxy- or 3-acyloxyacyl residues were lacking from C. burnetii LPS I and LPS II. As the major acyl group (R)-3-(12-methyl-tetradecanoloxy)-12-methyl-tetradecanoic acid was identified. Our results show that the complex fatty acid spectrum of C. burnetii differs considerably from that of LPS of other Gram-negative bacteria. They further suggest an enormous heterogeneity of the lipid A component of C. burnetii LPS I and LPS II.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00409228
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  • 7
    Electronic Resource
    Electronic Resource
    Gyromagnetic ratios of 4+ and 6+ states in156Gd and158Gd (1988)
    Springer
    The European physical journal 331 (1988), S. 277-286 
    Details
    ISSN: 1434-601X
    Keywords: 23.20 ; 27.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The followingg-factors have been derived from time integral measurements of γ-γ angular correlations in the static magnetic hyperfine field of magnetized gadolinium metal probes:156Gd:g(4 1 + )=+0.310(19)g(6 1 + )=+0.25(21)g(4 3 + , 1511 keV)=+0.809(27)158Gd:g(4 1 + )=+0.409(15). The 5.35d 156Tb sources were produced by the reaction156Gd(d, 2n)156Tb in our cyclotron. A carrier-free 150y 158Tb source was obtained from ISOLDE/CERN. In comparison with the precisely knowng-factors of the 2 1 + states,g(2 1 su+ ,156Gd) =+0.386(4) andg(2 1 + ,158Gd)=0.381(4), we observe a large reduction for the156Gd 4 1 + state whereasg increases slightly for158Gd. The half-life of the 4 1 + state of158Gd was remeasured as158Gd:T 1/2(4 1 + )=148(2) ps. A measurement of the rotation in the 4 3 + state of156Gd in external magnetic fields of various strengths up toB ext=9.5 T did not confirm the anomalous dependence of the magnetic hyperfine field in gadolinium metal on the external field, which has been reported by Persson et al. [29].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01355597
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  • 8
    Electronic Resource
    Electronic Resource
    Conversion processes in superheavy and giant atoms (1986)
    Springer
    The European physical journal 323 (1986), S. 139-155 
    Details
    ISSN: 1434-601X
    Keywords: 23.20 ; 25.70 ; 36.90
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Conversion of bound state electrons and internale +,e −-pair creation in superheavy and giant atoms are investigated. We consider various nuclear transitions of multipolaritiesE0, EL andML (L≧1) in superheavy atoms with Z〉109. We are concerned in particular with the pecularities of conversion processes in supercritical systems. Our theoretical studies are confronted with the prominent peak structures observed in positron spectra of very heavy collision systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290305
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  • 9
    Electronic Resource
    Electronic Resource
    Yrast states in81Br and82Br (1986)
    Springer
    The European physical journal 324 (1986), S. 127-137 
    Details
    ISSN: 1434-601X
    Keywords: 21.10 ; 23.20 ; 27.50+e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Levels in81Br and82Br have been investigated up to spin 21/2 and 10ħ, respectively, on the basis of in-beamγ-ray spectroscopy inα and deuteron induced reactions. In81Br a 3-quasiparticle (qp) band built on a (13/2−) level at 2.55 MeV has been established besides the bands built on thep 3/2 andg 9/2 proton excitations. The 3qp configuration is interpreted to include at least oneg 9/2 proton. The structures observed in the doublyodd nucleus82Br are associated withg 9/2 proton and/or neutron excitations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01325124
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  • 10
    Electronic Resource
    Electronic Resource
    Nucleon transfer reactions to rotational states induced by206, 208Pb projectiles (1986)
    Springer
    The European physical journal 325 (1986), S. 457-466 
    Details
    ISSN: 1434-601X
    Keywords: 25.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In a systematic study of nucleon transfer reactions accompanied by Coulomb excitation we have bombarded152Sm,160Gd and232Th with206, 208pb beams at incident energies close to the Coulomb barrier. Particle-gamma coincidence techniques were used to identify excited states of reaction products populated through inelastic scattering and in nucleon transfer reactions. One-neutron stripping and pick-up reactions on152Sm were observed leading to known states of the rotation alignedi 13/2-bands in153Sm and151Sm. In the160Gd+206, 208Pb systems no significant population of low lying states of product nuclei was found in the nucleon-transfer channels. Large cross sections were observed for one- and two-neutron pick-up from232Th at an incident energy of 6.4 MeV/u. Around the grazing angle they are of the same order of magnitude as the cross section measured for inelastic scattering. The results are analyzed in the framework of semiclassical models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290049
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