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  • 1995-1999  (30)
  • 1960-1964
  • 1998  (30)
  • 1
    Electronic Resource
    Electronic Resource
    Effect of chemical reactions on decaying isotropic turbulence (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 10 (1998), S. 1715-1724 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: There have been many studies of turbulent combustion flows, however the interaction between turbulent motion and the chemical reactions that occur in hypersonic flows has not been studied. In these flows, the rate of product formation depends almost exclusively on the temperature, and small temperature fluctuations may produce large changes in the rate of product formation. To study this process, we perform direct numerical simulations of reacting isotropic turbulence decay under conditions typical of a hypersonic turbulent boundary layer flow. We find that there is a positive feedback between the turbulence and exothermic reactions. That is, positive temperature fluctuations increase the reaction rate, thereby increasing the heat released by the reaction, which further increases the temperature. Simultaneously, the pressure increases causing localized expansions and compressions that feed the turbulent kinetic energy. The Reynolds stress budget shows that the feedback occurs through the pressure-strain term. We also find that the strength of the feedback depends on how much heat is released, the rate at which it is released, and the turbulent Mach number. The feedback process is negative for endothermic reactions, and temperature fluctuations are damped. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869688
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  • 2
    Electronic Resource
    Electronic Resource
    Increased Activity of Eukaryotic Initiation Factor 2B in PC12 Cells in Response to Differentiation by Nerve Growth Factor (1998)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 71 (1998), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: Translational rates, and activities and levels of initiation factors 2 and 2B were assessed in rat pheochromocytoma cells upon nerve growth factor (NGF) treatment. Two or 5 days of exposure to NGF caused significant quantitative increases in protein synthesis rate that are deemed necessary for neuronal differentiation. Changes in initiation factor 2 activity, as measured by its capacity to form a ternary complex, occur parallel to the observed changes in protein synthesis. Nevertheless, neither the intracellular levels of the initiation factor 2 nor the degree of phosphorylation of its α subunit can justify this increased activity. Interestingly, initiation factor 2B activity increases parallel to the neurite outgrowth, being significantly higher after 5 days of exposure to NGF, and could be responsible for the elevated rate of protein synthesis. No significant changes in the levels of eukaryotic initiation factor 2B, as determined with two different antibodies against the γ and ε subunits of the factor, were observed, implying that the increased activity should be regulated by factors other than its cellular concentration. Our results support the hypothesis that initiation factor 2B may play a role in the biochemical events controlling the differentiative growth factor-induced signaling pathway in these cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1471-4159.1998.71051905.x
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  • 3
    Electronic Resource
    Electronic Resource
    Manipulation of Ag nanoparticles utilizing noncontact atomic force microscopy (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 1505-1507 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have developed a scheme to manipulate metallic aerosol particles on silicon dioxide substrates using an atomic force microscope. The method utilizes the noncontact mode both for locating and moving nanoparticles of size 10–100 nm. The main advantage of our technique is the possibility of "seeing" the moving particle in real time. Our method avoids well sticking problems that typically hamper the manipulation in the contact mode. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122187
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  • 4
    Electronic Resource
    Electronic Resource
    Scleromyxoedema and thrombotic thrombocytopaenic purpura: two rare conditions both responding to plasma exchange (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the European Academy of Dermatology and Venereology 11 (1998), S. 0 
    Details
    ISSN: 1468-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We report the case of a 66-year-old female who over an 18-month period developed severe, disabling scleromyxoedema with pulmonary fibrosis. Treatment with oral prednisolone and melphalan had failed to prevent disease progression. Treatment with a 5-day course of plasma exchange, intravenous cyclophosphamide (500 mg) and methyl-prednisolone (1 g on 3 consecutive days) was unfortunately followed by the development of thrombotic thrombocytopaenic purpura (TTP). After 17 extra plasma exchanges, she recovered and there has been a dramatic improvement in her skin signs. We postulate that the extra plasma exchanges which she received as a consequence of developing TTP have contributed to this result. To our knowledge, TTP has never been associated with scleromyxoedema, but it is likely to be a coincidence in this case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1468-3083.1998.tb00956.x
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  • 5
    Electronic Resource
    Electronic Resource
    Changes in human plasma melatonin profiles in response to 50 Hz magnetic field exposure (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of pineal research 25 (1998), S. 0 
    Details
    ISSN: 1600-079X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: The effects of power-frequency magnetic fields on nighttime plasma melatonin were studied in a group of 30 adult male human subjects. Exposure consisted of 20 μT (200 mG) at 50 Hz (circularly polarized) at certain times in relation to the predicted time of onset of rise in melatonin concentration for a particular individual (the time of onset was predicted from a previous screening night). Response to this exposure was compared to sham-exposure (in random order). When exposure preceded onset of rise, a significant delay in onset time relative to sham-exposure of approximately half an hour was observed, with indications (marginally significant) of a reduction in maximum melatonin level. Analysis of distribution of time-delays is consistent with two populations: those individuals who respond (around 20%) and those that do not. Magnetic fields generated by square-wave currents produce more marked reductions in the maximum level when compared to sinusoidal waveforms, but there was no significant difference in onset time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-079X.1998.tb00548.x
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  • 6
    Electronic Resource
    Electronic Resource
    Cytokeratins in primary cutaneous amyloidosis (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Australasian journal of dermatology 39 (1998), S. 0 
    Details
    ISSN: 1440-0960
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The expression of keratins was investigated immunohistochemically on formalin-fixed and snap-frozen primary cutaneous amyloidosis tissue with a panel of monospecific and polyspecific antikeratin antibodies which recognized keratins K1, K5, K6, K7, K8, K10, K14, K16, K17, K18, and K19. Amyloid deposits in frozen section of seven cases of macular amyloidosis and lichen amyloidosus always reacted with antibodies LP34 (labeling K5, K6 and K18) MNF (labeling K5, K6, K8, K10, K17 and K18) and RCK 102 (labeling K5 and K8); frozen section in one case each of the seven cases also reacted with antibodies LL001 (labeling K14), Lp1K (labeling K7 and K17), and LP2K (labeling K19), LP1K (labelling K7 and K17), and LP2K (labelling K19), In formalin fixed section of 13 cases of macular amyloidosis and lichen amyloidosus amyloid deposits were labeled with LP34 in three section LL020 ()labelling keratins K5 and K6) in one section and LP2K in two section. In nodular primary cutaneous amyloidosis amyloid deposits were not labeled with any antikeratin antibodies. These data confirm that amyloid in macular amyloidosis and lichen amyloidosus contains keratin epitopes, and suggests derivation of the fibrillar component from keratin intermediate filaments Several different keratins appear to undergo conversion to amyloid, LP34, MNF 116 and RCK 102 antibodies, which have in common the labelling of keratin K5, may be useful in the diagnosis of macular and popular amyloidosis with frozen tissue section.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-0960.1998.tb01253.x
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  • 7
    Electronic Resource
    Electronic Resource
    Cyclin A1 is required for meiosis in the male mouse (1998)
    [s.l.] : Nature America Inc.
    Nature genetics 20 (1998), S. 377-380 
    Details
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] The mammalian A-type cyclin family consists of two members, cyclin A1 (encoded by Ccna1) and cyclin A2 (encoded by Ccna2). Cyclin A2 promotes both G1/S and G2/M transitions, and targeted deletion of Ccna2 in mouse is embryonic lethal. Cyclin A1 is expressed in mice exclusively in the germ cell ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/3855
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  • 8
    Electronic Resource
    Electronic Resource
    Cardiac defects and altered ryanodine receptor function in mice lacking FKBP12 (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 391 (1998), S. 489-492 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] FKBP12, a cis–trans prolyl isomerase that binds the immunosuppressants FK506 and rapamycin, is ubiquitouslyexpressed and interacts with proteins in several intracellular signal transduction systems.Although FKBP12 interacts with the cytoplasmic domains of type I receptors of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35146
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  • 9
    Electronic Resource
    Electronic Resource
    Wealth and the demand for money in the European union (1998)
    Springer
    Empirical economics 23 (1998), S. 507-524 
    Details
    ISSN: 1435-8921
    Keywords: Key words: Demand for money ; financial wealth ; narrow and broad money ; JEL classification: E41 ; E52
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract. This study presents the results of an empirical analysis of the demand for money in the European Union as a whole over the period 1971–1995, with a particular focus on the impact of financial wealth. The empirical evidence shows a substantial impact of wealth on the demand for M2 and M3, whereas no influence of wealth on the demand for M1 is found. This finding may explain the remarkable increase of the broad monetary aggregates over the last decade or so. This means that taking into account the growth of wealth, the monetary expansion has been fairly modest. The evidence thus indicates that the strong increase of M2 and M3 should be attributed to portfolio investment considerations rather than to an expansionary monetary policy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294420
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  • 10
    Electronic Resource
    Electronic Resource
    PKS2250-41 and the Role of Jet Cloud Interactions in Powerful Radio Galaxies (1998)
    Springer
    Astrophysics and space science 263 (1998), S. 67-70 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have studied the effects of the interaction between the radio jet and the ambient gas in the powerful radio galaxy PKS2250-41 (z = 0.31). Our results show that the gas has been accelerated, compressed, heated and collisionally ionized by the shock. This study helps us to understand the processes which determine the observed properties of many high redshift radio galaxies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002193424056
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