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  • Articles: DFG German National Licenses  (13)
  • 2000-2004  (4)
  • 1990-1994  (2)
  • 1980-1984  (7)
  • 1
    Electronic Resource
    Electronic Resource
    The interaction of hydrogen with a cobalt(101¯0) surface (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 5388-5401 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The adsorption of hydrogen on a cobalt(101¯0) surface was investigated in ultrahigh vacuum (UHV) between 85 and 500 K using Video-LEED, temperature-programmed thermal desorption (TPD), work function (ΔΦ) measurements, and high-resolution electron energy loss spectroscopy (HREELS). Between 90 and 200 K, hydrogen adsorbs dissociatively with high sticking coefficient (s0≥0.8) via precursor kinetics and forms, with increasing exposure, a c(2×4), a p2mg (2×1) and a (1×2) LEED structure (hydrogen coverages aitch-thetaH=0.5, 1.0, and 1.5, respectively). While the first two structures represent true ordered hydrogen phases there is strong evidence that the (1×2) phase is reconstructed, likely in a paired-row configuration. The formation of the (1×2) phase is slightly thermally activated; its decomposition produces a sharp thermal desorption maximum (α state) appearing on the low-energy side of a β-TPD signal which reflects the hydrogen desorbing from the unreconstructed surface. The activation energies for desorption from the α and β states are 62 and 80 kJ/mol, respectively. Chemisorption in the β state [(2×1) phase up to aitch-thetaH=1.0] is associated with a ΔΦ of +207 meV, while the fully developed (1×2) reconstructed phase (α state) causes a ΔΦ of approximately −122 meV resulting in an overall work function change of +85 meV at saturation. From HREELS, we determine the H adsorption site in all superstructures to be threefold with a local CS symmetry. Our results are discussed and compared with previous findings for similar metal–hydrogen interaction systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467392
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On two-dimensional magnetohydrodynamic turbulence (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 3282-3292 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Numerical studies of decaying two-dimensional (2D) magnetohydrodynamic (MHD) turbulence are presented. Results concern mainly the decay laws of integral quantities and the scaling properties of spectra and structure functions. The self-similarity of the decay is characterized by the invariance of the ratios of resistive and viscous dissipation rates, kinetic and magnetic energies, and mean parallel and perpendicular velocities. The energy decay rate is primarily determined by the conservation of the mean-square magnetic potential, but the process is somewhat retarded at intermediate times by current density condensation in the magnetic eddies. In contrast to the 3D case, the energy spectrum agrees with the Iroshnikov–Kraichnan (IK) law Ek∼k−3/2, but is modified by a strong anomalous bottleneck effect. Structure functions of the Elsässer fields satisfy the property of extended self-similarity, which provides accurate values of the relative scaling exponents. Also the structure functions themselves show clear scaling properties, particularly at the highest Reynolds numbers studied. The scaling exponent ζ2 is consistent with the IK spectrum, but ζ3 and ζ4 remain distinctly below unity, which is surprising in view of an exact relation suggesting ζ3=1. Finally, the role of the tearing mode in 2D MHD turbulence is revisited. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1377611
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  • 3
    Electronic Resource
    Electronic Resource
    Localization, the clue to fast magnetic reconnection (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 4729-4731 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of localization of the resistivity is studied in the coalescence of two magnetic flux bundles. The reconnection process is consistent with the Petschek configuration, and the reconnection rate E depends only weakly on the value η0 of the resistivity at the X-point, E∝1/|log η0|. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1412600
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  • 4
    Electronic Resource
    Electronic Resource
    The glucose kinase gene of Streptomyces coelicolor A3(2): its nucleotide sequence, transcriptional analysis and role in glucose repression (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 6 (1992), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Mutants (glk) of Streptomyces coelicolor A3(2) that are resistant to the non-utilizable glucose analogue 2-deoxyglucose are deficient in glucose kinase activity, defective in glucose repression, and usually unable to utilize glucose. A 2.9 kb Bcll fragment, previously shown to restore a wild-type phenotype to a glk deletion mutant that lacks the entire segment, contains two complete open reading frames that would encode proteins of 20.1 kDa (ORF2) and 33.1 kDa (ORF3). ORF3 is transcribed from its own promoter, and also from a promoter that initiates transcription upstream of ORF2. A derivative of the temperate phage πC31 containing ORF3 alone restored a wild-type phenotype when used to lysogenize the deletion mutant. The product of ORF3 is homologous to members of a family of repressor proteins encoded by xylR In Bacillus subtilis and Lactobacilius pentosus, and by nagC in Escherichia coli. Although this might suggest that ORF3 encodes a positive activator for glucose kinase, rather than the enzyme itself, ORF3 restored the ability to metabolize glucose to an E. coli glk mutant, and activity gels of cell extracts of E. coli containing ORF3 cloned in the pT7-7 expression vector demonstrated that the ORF3 product has glucose kinase activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1992.tb01463.x
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  • 5
    Electronic Resource
    Electronic Resource
    Oral health and dental care in modern-day China (2001)
    Copenhagen : Munksgaard International Publishers
    Community dentistry and oral epidemiology 29 (2001), S. 0 
    Details
    ISSN: 1600-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract – The purpose of this paper is to present salient background information on the oral care situation and organization in China and to review epidemiological literature that has been published on adults in Chinese dental journals during the last 20 years as a context for understanding ongoing oral health research activities in China. Searches were conducted through Medline as well as Chinese language catalogues and around 30 Chinese dental journals. Most oral health surveys on adults were conducted after 1970 mainly on residents living in big cities, which are also the location of major medical universities. Surveys conducted among farmers were uncommon. Dental caries and periodontal disease were the major dental diseases studied. Only a few surveys on people’s oral health knowledge, attitudes and behavior were conducted. Papers concerning dental treatment needs and utilization of dental services among adults were scarce. Sample size was usually not a major problem in these surveys but the sampling methods and diagnostic criteria used were often poorly defined. Mean DMFT scores between 2 and 6 were reported in the 35–44-year-olds and between 9 and 16 in the elderly younger than 75 years. Calculus and gingivitis were reported to be common in adult Chinese; the proportion of subjects with shallow and deep periodontal pockets was not high. Complete edentulousness in the 60–69-year-olds was usually reported to be less than 10%. About 14% of the 35–44-year-olds and 19% of the 65–74-year-olds did not brush their teeth daily/〉.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0528.2001.290501.x
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  • 6
    Electronic Resource
    Electronic Resource
    Changes in the serine-specific transfer ribonucleic acid pattern of guinea pig epidermis after corticosteroid treatment (1980)
    Springer
    Archives of dermatological research 269 (1980), S. 153-159 
    Details
    ISSN: 1432-069X
    Keywords: Serine-specific isoaccepting tRNAs ; Guinea pig epidermis ; Keratinization ; Triamcinolon ; Serinspezifische isoakzeptierende tRNA ; Meerschweinchenepidermis ; Keratinisation ; Triamcinolon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Durch „reversed phase”-Chromatographie von 3H- oder 14C-serinbeladenen Gesamt-tRNA-Präparaten wurde das Multiplizitätsmuster der serinspezifischen Transfer-Ribonucleinsäuren in der Meerschweinchenepidermis ermittelt und mit dem der Leber als Bezugssystem verglichen. Fünf tRNAser (I–V) konnten dargestellt werden, von denen zwei, tRNA I ser und tRNA V ser , „typisch” für die Epidermis zu sein scheinen und insofern möglicherweise Stoffwechselbesonderheiten der epidermalen Zelldifferenzierung reflektieren. Diese Hypothese wurde weiter untermauert, indem gezeigt werden konnte, daß lokale Applikation des Corticosteroids Triamcinolon in der Meerschweinchenepidermis selektiv tRNA I ser und tRNA V ser auf das Zwei- bis Dreifache erhöht. Die mögliche Bedeutung dieser Befunde wurde eingehend diskutiert.
    Notes: Summary The pattern of serine-specific tRNAs from guinea pig epidermis was determined and compared to that from liver by employing reversed phase chromatography on total tRNA preparations aminoacylated with 3H- or 14C-serine. Five tRNA s ser (I–V) were found, two of which, tRNA I ser and tRNA V ser , appear to be “typical” for epidermis and in so far probably reflect in some way metabolic pecularities of epidermal cell differentiation. This hypothesis was further corroborated by showing that the locally applied corticosteroid triamcinolon selectively increases tRNA I ser and tRNA V ser 2-3-fold. The implications of these findings were discussed in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00406535
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Ein Beitrag zum Einfluß des Stoffüberganges auf eine erzwungene Konvektion an einer fluiden Phasengrenze (1980)
    Springer
    Heat and mass transfer 13 (1980), S. 187-194 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Es wird das grenzflächendynamische Verhalten eines fluiden Zweiphasensystems unter den Bedingungen einer gezielten örtlichen Beaufschlagung der Phasengrenze durch ebene Strahlen bei gleichzeitig ablaufendem Stoffübergang untersucht. Hierzu wird in einem ausgewählten Punkt die Tangentialgeschwindigkeit in der Phasengrenze bzw. in Phasengrenznähe in Abhängigkeit von der Austrittsgeschwindigkeit der Strahlen in den beiden Phasen berührungslos mit Hilfe einer Laser-Doppler-Velocimeter-Anordnung im System Luft-Wasser mit und ohne Übergang von Azeton vermessen und verglichen. Die nur bei niedrigen Strahlaustrittsgeschwindigkeiten nachweisbaren Änderungen der Strömungsgeschwindigkeiten durch grenzflächendynamische Effekte werden an Hand von Modellvorstellungen diskutiert und mit theoretischen Untersuchungen des Wärmeüberganges in einem fluiden Zweiphasensystem verglichen.
    Notes: Abstract The interfacial-dynamic behaviour of a fluid two-phase-system with mass transfer was investigated under influence of forced convection in the manner of flat jets directed to the interface. The tangential velocities were measured at a characteristic point near to the interface air/water or in the interface itself using a Laser-Doppler-Velocimeter in dependence on the velocities of jets into two phases in both cases with and without transfer of acetone. The variations of velocities due to the interfacial effects are only detectable at small velocities of the jets. They are discussed by model conceptions and compared with the results of a theoretical research of heat transfer in a fluid two-phase-system (Interfacial-dynamic surface renewal model).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01433446
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  • 8
    Electronic Resource
    Electronic Resource
    Small-angle X-ray studies of annelid hemoglobins*) (1981)
    Springer
    Colloid & polymer science 259 (1981), S. 656-656 
    Details
    ISSN: 1435-1536
    Keywords: Small-angle ; X-ray scattering ; annelid hemoglobins
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01525031
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  • 9
    Electronic Resource
    Electronic Resource
    Effects of interchain disulfide bridges on the radius of gyration and maximum length of antibodies before and after reaction with the specific hapten (1981)
    Springer
    Colloid & polymer science 259 (1981), S. 658-658 
    Details
    ISSN: 1435-1536
    Keywords: Small angle ; antibody ; immunoglobulin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01525033
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  • 10
    Electronic Resource
    Electronic Resource
    Functional specificity of the mitochondrial DnaJ protein, Mdj1p, in Saccharomyces cerevisiae (2000)
    Springer
    Molecular genetics and genomics 263 (2000), S. 527-534 
    Details
    ISSN: 1617-4623
    Keywords: Key words Mitochondrial DnaJ ; Mdj1p ; Mitochondrial DNA ; Complementation ; Chaperone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Inactivation of the gene for the mitochondrial DnaJ homolog, Mdj1p, in Saccharomyces cerevisiae results in temperature sensitivity and the loss of respiratory activity; the latter phenotype has been attributed to the loss of mitochondrial DNA. To investigate the functional specificity of Mdj1p, non-mitochondrial DnaJ proteins were targeted to mitochondria and tested for their ability to substitute for Mdj1p. The tested DnaJ proteins were able to complement the two Mdj1p-linked phenotypes, i.e., respiratory activity and growth at 37 °C, to different extents, ranging from full to very poor complementation. All DnaJ homologs ensured faithful propagation of the mitochondrial genome. N-terminal fragments of Mdj1p and Escherichia coli DnaJ comprising the well-characterized J domain partially substituted for Mdj1p. As the only hitherto known function of the N-terminal fragment is modulation of the substrate binding activity of the cognate Hsp70, we conclude that both Mdj1p-linked phenotypes – maintenance of respiratory activity and the ability to grow at elevated temperature – involve a mitochondrial Hsp70 partner protein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004380051198
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    Paper (German National Licenses)
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