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  • 1995-1999  (27)
  • 1985-1989  (20)
  • 1935-1939  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Silica concentration dependence of the kinetics of polydimethylsiloxane adsorption on aggregates (1998)
    Springer
    Polymer bulletin 41 (1998), S. 253-260 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The kinetics of adsorption of pure polydimethylsiloxane or of bimodal mixtures, onto silica aggregates, was observed from the melt as a function both of polymer weight fraction (2.5 to 20 g/g) and of the specific area (50, 150 and 300 m2/g). Attention was focused on filled polymers wherein silica aggregates are connected to one another by adsorbed chains to form a network. Results were analysed according to a molecular approach. All observed kinetics curves were found to obey a property of superposition by using a suitable reduced time variable defined as : ; is the number average molecular weight and Qi is the initial amount of polymer per unit mass of silica. The rate of adsorption is proportional to 1/Qi.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002890050359
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  • 2
    Electronic Resource
    Electronic Resource
    Skinned polymeric membranes. Approach to the mechanism of formation of surface holes (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 38 (1995), S. 299-303 
    Details
    ISSN: 0959-8103
    Keywords: skin membranes ; hole formation ; diffusion ; polyetherimides ; videomicroscopy ; solvent diffusion coefficient ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: It is shown quantitatively that the formation of holes through the skin of membranes, prepared by the quick immersion in water of polyetherimides in solution in N-methylpyrrolidone, is governed by the solvent mobility. The surface pattern observed by videomicroscopy exhibits a characteristic distance between neighbouring holes (≃5 μm) which is a linear function of D-1s; Ds is the solvent diffusion coefficient in the polymeric solution, measured using a pulsedfield gradient NMR technique. The dependence of this distance on the solvent concentration in water is also characterized.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pi.1995.210380312
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  • 3
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    Protein kinase C isotypes controlled by phosphoinositide 3-kinase through the protein kinase PDK1 (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-09-25
    Description: Phosphorylation sites in members of the protein kinase A (PKA), PKG, and PKC kinase subfamily are conserved. Thus, the PKB kinase PDK1 may be responsible for the phosphorylation of PKC isotypes. PDK1 phosphorylated the activation loop sites of PKCzeta and PKCdelta in vitro and in a phosphoinositide 3-kinase (PI 3-kinase)-dependent manner in vivo in human embryonic kidney (293) cells. All members of the PKC family tested formed complexes with PDK1. PDK1-dependent phosphorylation of PKCdelta in vitro was stimulated by combined PKC and PDK1 activators. The activation loop phosphorylation of PKCdelta in response to serum stimulation of cells was PI 3-kinase-dependent and was enhanced by PDK1 coexpression.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Le Good, J A -- Ziegler, W H -- Parekh, D B -- Alessi, D R -- Cohen, P -- Parker, P J -- New York, N.Y. -- Science. 1998 Sep 25;281(5385):2042-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Protein Phosphorylation Laboratory, Imperial Cancer Research Fund, 44 Lincoln's Inn Fields, London WC2A 3PX, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9748166" target="_blank"〉PubMed〈/a〉
    Keywords: 3-Phosphoinositide-Dependent Protein Kinases ; Binding Sites ; Cell Line ; Chromones/pharmacology ; Enzyme Activation ; Enzyme Inhibitors/pharmacology ; Humans ; Isoenzymes/*metabolism ; Morpholines/pharmacology ; Phosphatidylcholines/pharmacology ; Phosphatidylinositol 3-Kinases/*metabolism ; Phosphatidylinositol Phosphates ; Phosphatidylserines/pharmacology ; Phosphorylation ; Protein Kinase C/*metabolism ; Protein Kinase C beta ; Protein-Serine-Threonine Kinases/*metabolism ; Recombinant Proteins/metabolism ; Tetradecanoylphorbol Acetate/pharmacology
    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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  • 4
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    Silica concentration dependence of the kinetics of polydimethylsiloxane adsorption on aggregates (1998)
    Springer
    Details
    Publication Date: 1998-08-17
    Print ISSN: 0170-0839
    Electronic ISSN: 1436-2449
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic properties of molecular-beam epitaxial grown (100) iron films (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3662-3663 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of epitaxial iron films have been studied. The iron films were grown on {100} GaAs and GaInAs substrates. Both the magnitude of the anisotropy energies and direction of the easy axes were studied using a SQUID magnetometer. In particular, measurements were made of the magnetization in the plane of the film along the 〈100〉 and 〈110〉 directions. From these measurements the magnitude of the anisotropy energy and the direction of the easy axis were determined. Also measurements of the coercivity of the films were made using a magneto-optic Kerr effect system. These results are compared with those determined previously for iron films grown on GaAs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340677
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  • 6
    Electronic Resource
    Electronic Resource
    Substrate modified growth of epitaxial Fe films (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3672-3672 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is now clear that both the atomic and magnetic properties of epitaxial Fe films can be controlled by the precise nature of the substrate which acts as the template for the growth. We have investigated the role of defects and strain arising from lattice mismatch on the growth and the magnetic properties of the Fe films. The films were grown by molecular-beam epitaxy (MBE) on three different well characterized surfaces: GaAs(100), In0.2Ga0.8As(100), and Fe(100). The first two surfaces were also prepared by MBE. This mole fraction of In was chosen to match the lattice constant of bulk α-Fe. The growth of the Fe film was characterized by using reflection high-energy electron diffraction (RHEED) and the results indicate that the morphology of the Fe films is smoother on the InGaAs surface than on the GaAs surface. Yet is is still much rougher than the growth on Fe(100) substrate. The magnetic properties were measured by using a SQUID magnetometer and coercivity values are comparable to that of the films grown on ZnSe.1
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340681
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  • 7
    Electronic Resource
    Electronic Resource
    Characterization of iron based precipitates in GaAs layers grown by molecular-beam epitaxy (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 2400-2402 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: GaAs layers that contain small Fe-based precipitates have been grown using molecular-beam epitaxy. The layers were produced either by codepositing Fe during GaAs growth or by first depositing a thin layer of an Fe-Ga alloy and then growing a capping layer of GaAs. Microstructural characterization of the layers was performed by using transmission electron microscopy. For those samples in which the Fe alloy layer was deposited, the layer disappeared after GaAs growth, leaving behind Fe-containing precipitates distributed throughout the GaAs overlayer. Precipitates were also formed in Fe codeposited samples. The sizes and number densities of the precipitates were dependent on the growth method used, with mean diameters ranging from 21 to 47 nm and number densities from 1013–1015 per cm3. The phase, orientation, and morphology of the particles were also dependent on the growth conditions used, with FeAs and Fe being observed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113953
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  • 8
    Electronic Resource
    Electronic Resource
    The Structure and Regulation of Protein Phosphatases (1989)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biochemistry 58 (1989), S. 453-508 
    Details
    ISSN: 0066-4154
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.bi.58.070189.002321
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  • 9
    Electronic Resource
    Electronic Resource
    Glutamic Acid as a Hydrogen Carrier in Animal Tissues (1939)
    [s.l.] : Nature Publishing Group
    Nature 144 (1939), S. 513-514 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It has previously been shown that α-ketonie acids liberate carbon dioxide when added to animal tissues under anaerobic conditions1. The evolution of carbon dioxido was found to be due to a ‘dismutation’. (1) 2 R.CO.COOII + 11,0 = R.C1I(OH).COOH + KXOOH-KO.. We have now ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/144513b0
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  • 10
    Electronic Resource
    Electronic Resource
    Effects of the tumour promoter okadaic acid on intracellular protein phosphorylation and metabolism (1989)
    [s.l.] : Nature Publishing Group
    Nature 337 (1989), S. 78-81 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The first insight into the mechanism of action of okadaic acid came from the finding that it enhanced the contraction of skinned smooth muscle fibres, indicating that myosin P-light chain phosphorylation was increased6. This appeared to be mediated by inhibition of protein phosphatase(s) as myosin ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/337078a0
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