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  • 1
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    Synthesis and Characterization of Methyl(perfluoroalkyl)Tellurium(II) Compounds, MeTeRf (Rf = CF3, C2F5), the Corresponding Tellurium(IV) Dihalides, MeTe(Rf)X2 (X = F, Cl, Br, I), and Bis(trifluoroacetates), MeTe(Rf)(OCOCF3)2 (2012)
    Wiley
    Details
    Publication Date: 2012-04-15
    Description: MeTe R f ( R f = CF 3 , C 2 F 5 ) can easily be prepared via the reactions of methyl iodide and the corresponding tetramethylammonium perfluoroalkyltellurates(0), [NMe 4 ]Te R f ( R f = CF 3 , C 2 F 5 ). Both compounds are easily oxidized by xenon difluoride and the heavier halogens to yield the corresponding dihalides, MeTe( R f ) X 2 ( X = F, Cl, Br, I) and by ArI(OCOCF 3 ) 2 to give the corresponding trifluoroacetates, MeTe( R f )(OCOCF 3 ) 2 . All compounds are characterized byspectroscopic means. The molecular structures of MeTe( R f )F 2 ,MeTe( R f )Cl 2 , MeTe( R f )Br 2 , and of 4-MeC 6 H 4 I(OCOCF 3 ) 2 were elucidated by XRD methods.
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley
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  • 2
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    Synthesis and Characterization of Methyl(perfluoroalkyl)Tellurium(II) Compounds, MeTeRf (Rf = CF3, C2F5), the Corresponding Tellurium(IV) Dihalides, MeTe(Rf)X2 (X = F, Cl, Br, I), and Bis(trifluoroacetates), MeTe(Rf)(OCOCF3)2 (2012)
    Wiley
    Details
    Publication Date: 2012-01-06
    Description: . MeTe R f ( R f = CF 3 , C 2 F 5 ) can easily be prepared via the reactions of methyl iodide and the corresponding tetramethylammonium perfluoroalkyltellurates(0), [NMe 4 ]Te R f ( R f = CF 3 , C 2 F 5 ). Both compounds are easily oxidized by xenon difluoride and the heavier halogens to yield the corresponding dihalides, MeTe( R f ) X 2 ( X = F, Cl, Br, I) and by ArI(OCOCF 3 ) 2 to give the corresponding trifluoroacetates, MeTe( R f )(OCOCF 3 ) 2 . All compounds are characterized byspectroscopic means. The molecular structures of MeTe( R f )F 2 ,MeTe( R f )Cl 2 , MeTe( R f )Br 2 , and of 4-MeC 6 H 4 I(OCOCF 3 ) 2 were elucidated by XRD methods.
    Print ISSN: 0044-2313
    Electronic ISSN: 1521-3749
    Topics: Chemistry and Pharmacology
    Published by Wiley
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  • 3
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    Friction anisotropy and asymmetry of a compliant monolayer induced by a small molecular tilt (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-04-29
    Description: Lateral force microscopy in the wearless regime was used to study the friction behavior of a lipid monolayer on mica. In the monolayer, condensed domains with long-range orientational order of the lipid molecules were present. The domains revealed unexpectedly strong friction anisotropies and non-negligible friction asymmetries. The angular dependency of these effects correlated well with the tilt direction of the alkyl chains of the monolayer, as determined by electron diffraction and Brewster angle microscopy. The molecular tilt causing these frictional effects was less than 15 degrees, demonstrating that even small molecular tilts can make a major contribution to friction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Liley -- Gourdon -- Stamou -- Meseth -- Fischer -- Lautz -- Stahlberg -- Vogel -- Burnham -- Duschl -- New York, N.Y. -- Science. 1998 Apr 10;280(5361):273-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉M. Liley, D. Stamou, U. Meseth, H. Vogel, C. Duschl, Department of Chemistry, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland. D. Gourdon and N. A. Burnham, Department of Physics, Swiss Federal Institute of Technology, CH-1015.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9535654" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    Axonal neuregulin-1 regulates myelin sheath thickness (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2004-03-27
    Description: In the nervous system of vertebrates, myelination is essential for rapid and accurate impulse conduction. Myelin thickness depends on axon fiber size. We use mutant and transgenic mouse lines to show that axonal Neuregulin-1 (Nrg1) signals information about axon size to Schwann cells. Reduced Nrg1 expression causes hypomyelination and reduced nerve conduction velocity. Neuronal overexpression of Nrg1 induces hypermyelination and demonstrates that Nrg1 type III is the responsible isoform. We suggest a model by which myelin-forming Schwann cells integrate axonal Nrg1 signals as a biochemical measure of axon size.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Michailov, Galin V -- Sereda, Michael W -- Brinkmann, Bastian G -- Fischer, Tobias M -- Haug, Bernhard -- Birchmeier, Carmen -- Role, Lorna -- Lai, Cary -- Schwab, Markus H -- Nave, Klaus-Armin -- New York, N.Y. -- Science. 2004 Apr 30;304(5671):700-3. Epub 2004 Mar 25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurogenetics, Max Planck Institute of Experimental Medicine, 37075 Gottingen, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15044753" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Axons/*physiology/*ultrastructure ; Ganglia, Spinal/chemistry ; Gene Targeting ; Genes, erbB ; Genes, erbB-2 ; Heterozygote ; Mice ; Mice, Knockout ; Mice, Transgenic ; Models, Neurological ; Myelin Sheath/*physiology/*ultrastructure ; Neural Conduction ; Neuregulin-1/genetics/*physiology ; Protein Isoforms/physiology ; Receptor, Epidermal Growth Factor/analysis/physiology ; Receptor, ErbB-2/analysis/physiology ; Receptor, ErbB-3/analysis/physiology ; Schwann Cells/physiology ; Sciatic Nerve/chemistry ; Signal Transduction
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 5
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    The red cell as a fluid droplet: tank tread-like motion of the human erythrocyte membrane in shear flow (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-11-24
    Description: When whole human blood is subjected to viscometric flow, individual red cells are seen to be elongated and oriented in the shear field. In addition, a tank tread-like motion of the membrane around the cell content occurs. In dilute suspensions of erythrocytes in viscous media, the same behavior is better observed and can also be measured quantitatively.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fischer, T M -- Stohr-Lissen, M -- Schmid-Schonbein, H -- New York, N.Y. -- Science. 1978 Nov 24;202(4370):894-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/715448" target="_blank"〉PubMed〈/a〉
    Keywords: *Blood Viscosity ; Erythrocyte Membrane/*physiology ; Erythrocytes/*physiology/ultrastructure ; Humans ; Rheology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
    Electronic Resource
    Electronic Resource
    Dispersion of surface plasmons in rectangular, sinusoidal, and incoherent silver gratings (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 1577-1581 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dispersion behavior of surface plasmons on silver gratings in the center of the first Brillouin zone is determined by measurements of the reflected light as a function of amplitude and of the profile of the gratings. We studied the dispersion relation of sinusoidal gratings, rectangular gratings, and incoherent gratings. We found a strict relationship between the profile of the grating and the dispersion relation of the surface plasmons. Our experiments showed at small amplitudes a crossing of the dispersion branches without a gap. For higher amplitudes a frequency or a momentum gap occurred depending on whether the profile had higher Fourier components or not. The experimental results are in accordance with numerical simulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356394
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  • 7
    Electronic Resource
    Electronic Resource
    Primary and secondary stability analysis of a three-dimensional boundary-layer flow (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 2378-2391 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A three-dimensional, incompressible boundary-layer flow is investigated theoretically with respect to primary and secondary instability. These investigations accompany a basic transition experiment, which is being performed at the DLR in Göttingen [B. Müller, in Laminar-Turbulent Transition, edited by D. Arnal and R. Michel (Springer-Verlag, Berlin, 1990), p. 489]. Primary stationary and secondary nonstationary disturbances are used to model the mean flow and the fluctuations of a measured (quasi-) saturation state. The analysis is based on a Falkner–Skan–Cooke approximation of the undisturbed flow. Good agreement of the secondary stability model with this experiment is obtained, especially concerning the spatial distribution of the rms fluctuation. A striking change of the vortex pattern due to secondary instability has not been observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858218
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  • 8
    Electronic Resource
    Electronic Resource
    A boundary integral method for the numerical computation of the forces exerted on a sphere in viscous incompressible flows near a plane wall (1987)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 38 (1987), S. 339-365 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Es werden langsame, gleichförmige Strömungen einer zähen, inkompressiblen Flüssigkeit um eine starre Kugel in der Nähe einer ebenen Wand betrachtet. Die von der Flüssigkeit auf die Kugel ausgeübten Widerstands- und Querkräfte werden berechnet. Die numerischen Ergebnisse werden mit bestehenden, theoretischen und experimentellen Daten für diese und verwandte Strömungen verglichen. Sie basieren auf einer Randelementmethode für verschiedene, linearisierte Randwertprobleme.
    Notes: Abstract Slow uniform flows of a viscous, incompressible fluid past a rigid sphere near a plane wall are considered. The drag and lateral forces exerted on the sphere by the fluid are computed. The numerical results are compared with existing theoretical and experimental data for these and related fluid flows. They are based on a boundary element method for various linearized boundary value problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00944955
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  • 9
    Electronic Resource
    Electronic Resource
    A mode coupling analysis of the central peak at order disorder phase transitions (1993)
    Springer
    The European physical journal 92 (1993), S. 67-73 
    Details
    ISSN: 1434-6036
    Keywords: 64.70.PK ; 05.70 ; 75.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The influence of local and translation invariant memory effects on the critical dynamics of a model undergoing a continous structural phase transition from a disordered (T〉T c ) to an ordered distorted phase (T〉T c ) is studied by mode coupling theory above the critical temperatureT c . It is shown that besides the existence of critical slowing-down modes there also exists a central peak as a consequence of correlations of the critical modes, increasing with the critical exponent γ when approachingT c . The dependence of the central peak on the wavevector $$\vec q$$ , temperatureT and on the spatial dimensiond is investigated. Ford=3 a scenario withlocal long time memory correlations is compared with respect to its temperature and momentum dependence with a model using translation invariant long time memory correlations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01309169
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  • 10
    Electronic Resource
    Electronic Resource
    Wall effects on the slow steady motion of a particle in a viscous incompressible fluid (1986)
    Chichester, West Sussex : Wiley-Blackwell
    Mathematical Methods in the Applied Sciences 8 (1986), S. 23-40 
    Details
    ISSN: 0170-4214
    Keywords: Mathematics and Statistics ; Applied Mathematics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics
    Notes: In this paper, asymptotic expansions with respect to small Reynolds numbers are proved for the slow steady motion of an arbitrary particle in a viscous, incompressible fluid past a single plane wall. The flow problem is modelled by a certain boundary value problem for the stationary, nonlinear Navier-Stokes equations. The coefficients of these expansions are the solutions of various, linear Stokes problems which can be constructed by single layer potentials and corresponding boundary integral equations on the boundary surface of the particle. Furthermore, some asymptotic estimates at small Reynolds numbers are presented for the slow steady motion of an arbitrary particle in a viscous, incompressible fluid between two parallel, plane walls and in an infinitely long, rectilinear cylinder of arbitrary cross section.In the case of the flow problem with a single plane wall, the paper is based on a thesis, which the author has written under the guidance of Professor Dr. Wolfgang L. Wendland.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mma.1670080103
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