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  • 1
    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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  • 2
    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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  • 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
    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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  • 6
    Electronic Resource
    Electronic Resource
    Antiviral activities of anthraquinones, bianthrones and hypericin derivatives from lichens (1996)
    Springer
    Cellular and molecular life sciences 52 (1996), S. 180-183 
    Details
    ISSN: 1420-9071
    Keywords: Antiviral activity ; 7,7′-dichlorohypericin ; 5,7-dichloroemodin ; hypericin ; anthraquinones ; bianthrones ; lichen ; Nephroma laevigatum ; Heterodermia obscurata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The antiviral activities of some naturally occurring anthraquinones bianthrones, and hypericin derivatives were compared by the end-point CPE (viral cytopathic effects) method and plaque assays. Under optimal conditions of exposure to light, hypericin, 7,7′-dichlorohypericin and 5,7-dichloroemodin exhibited strong inhibitory activity against HSV-1 (herpes simplex virus type 1) in both assays. Partial inactivation of the virus was shown by emodin, 7-chloroemodin and 7-chloro-1-O-methylemodin; the bianthrones and other anthraquinones were found to be inactive. Antiviral activity appeared to be, positively correlated with increasing substitution of chlorine in the anthraquinone structure. In the absence of light, only hypericin and 7,7′-dichlorohypericin displayed detectable activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01923366
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  • 7
    Electronic Resource
    Electronic Resource
    Comparison of seasonal influence on pregnancy duration in man and domestic animals (1970)
    Springer
    International journal of biometeorology 14 (1970), S. 365-369 
    Details
    ISSN: 1432-1254
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Description / Table of Contents: Zusammenfassung Aus der Literatur gesammelte Werte über die monatliche Abweichung der Dauer der Gestation beim Menschen, Rind, Büffel und Pferd werden verglichen. Der Vergleich zeigt bei den 4 Arten einen ähnlichen Trend auf, der auf das Vorliegen eines allgemeinen Faktors als Ursache der Abweichung hinweist. Die Möglichkeit, dass dieser Faktor mit dem Wechsel der Tageslänge in Verbindung steht, wird besprochen.
    Abstract: Resume On compare les variations mensuelles de la durée de gestation chez l'homme, la vache, le buffle et le cheval en partant de chiffres publiés. La comparaison présente chez ces quatre espèces un mouvement analogue qui laisse présager qu'un facteur général en est la cause. On discute la possibilité d'une liaison indirecte entre ce facteur et les fluctuations de la durée du jour.
    Notes: Abstract Data on monthly variations of the duration of pregnancy, collected from the literature, were compared for man, cattle, buffalo and horse. This comparison showed a similar trend occurring in the different species, indicating the existence of a general factor, participating in causing the variations. The possibility that this factor is, in an indirect way, connected with daylight changes, is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01462912
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  • 8
    Electronic Resource
    Electronic Resource
    Higher order Ito product formula and generators of evolutions and flows (1995)
    Springer
    International journal of theoretical physics 34 (1995), S. 1481-1486 
    Details
    ISSN: 1572-9575
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A simple combinatorial formula is found for the product of two iterated quantum stochastic integrals, and used to find conditions that such an integral represent a unitary-valued or*-algebra homomorphism-valued process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00676257
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  • 9
    Electronic Resource
    Electronic Resource
    Separation of oviposition-stimulating peptides and myotropic factors from head extracts of Galleria mellonella L.: Comparative effects of myotropic and non-myotropic factors on egg laying (1995)
    Springer
    Journal of comparative physiology 165 (1995), S. 102-109 
    Details
    ISSN: 1432-136X
    Keywords: Oviposition ; Ecdysteroid ; Neurotransmitter ; Galleria mellonella ; Gryllus bimaculatus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Methanolic extracts from heads of the wax moth, Galleria mellonella L. contain several factors that stimulate oviposition of virgin females in vivo and spontaneous contractions of the oviduct in vitro of the cricket, Gryllus bimaculatus. The myotropic and egglaying activities behaved distinctly during all steps of purification, including fractionation on reverse-phase high-performance liquid chromatography. A novel neuropeptide was isolated from Galleria mellonella. The peptide does not increase the motility of isolated cricket oviducts. Among 13 other myotropic or non-myotropic factors studied, none were found to be as potent as the new peptide in stimulating egg-laying activity. The dose-response curves of myotropic and non-myotropic factors indicate that (i) proctolin, l-glutamate, octopamine, leucokinin-VI, leucopyrokinin, ecdysone and 20-hydroxy-ecdysone, or equivalent structures, might be involved in Galleria mellonella oviposition control, and (ii) that only the novel wax moth neuropeptide has the ability to trigger egg laying in that insect. The significance of these findings is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00301474
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  • 10
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    The role of voice input for human-machine communication. (1995)
    National Academy of Sciences
    Details
    Publication Date: 1995-10-24
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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