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  • 2010-2014
  • 1990-1994  (14)
  • 1993  (14)
  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 7289-7294 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The structures of two high pressure modifications of NaOH have been determined by in situ x-ray measurements with a diamond anvil cell. Thermodynamic data for the transformation are derived from the P,T diagram. The structures are discussed and especially the influence of the H atoms on characteristic deformations. The compressibility of α-NaOH shows an anomaly, which can be explained by a continuous transformation to yet another new modification, which is isotypic with the low-temperature form of NaOD.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 41 (1993), S. 1300-1304 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 41 (1993), S. 2082-2085 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiovascular electrophysiology 4 (1993), S. 0 
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Calcium Current in Human Heart. Introduction: Significant species-, issue-, and age-dependent differences have been described for the L-type calcium current (ICa). Therefore, extrapolation data obtained from the many animal models to human cardiac physiology is difficult. In this study, we have characterized the voltage-dependent properties of ICa from pediatric and adult, atrial and ventricular human heart tissue. Methods and Results: ICa, was measured in single human heart muscle cells using the “whole cell,” voltage clamp method. Single myocytes were isolated from myocardial specimens obtained intraoperatively from both pediatric and adult patients (ages 3 months to 75 years) undergoing cardiac surgery. Cells obtained for these experiments appeared to be healthy; the resting potential was between -80 and -85 mV. The action potential shape and duration and current-voltage relationship for 1Ca were similar to that reported by others for human heart cells. The steady-state activation variable, dx was found to be similar in both pediatric atrial and ventricular cells but shifted approximately 5 mV negative in the adult atrial and ventricular cells. I, of all cells displayed biex-ponential inactivation and steady-state inactivation was incomplete at positive potentials (steady-state inactivation curves turned up at positive potentials) consistent with inactivation arising from voltage-dependent and calcium-dependent processes as reported in heart cells from many species. The potential of maximal inactivation was more negative for adult cells (around -10 mV) than pediatric cells (around 0 mV). Estimates of the calcium “window” current, using a modified Hodgkin-Huxlcy model, could explain measured differences in action potential shape and duration. Conclusion: Human cardiac I, can be investigated using whole cell, voltage clamp methods and a modified Hodgkin-Huxley model. Quantitative characterization of many of the properties of ICa in human heart tissue suggests that important species differences do exist and that further investigations are required to characterize the dependence of inactivation on [Ca2+]i in human heart cells. Since the array of characteristics of ICa in different species varies, the study of human myocardial cells per se continues to be important when examining human cardiac physiology.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiovascular electrophysiology 4 (1993), S. 0 
    ISSN: 1540-8167
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Glibenclamide Block of KATP Channels. Introduction: The mechanism by which glibenclamide inhibits KATP channel activity has been examined in membrane patches from isolated rat ventricular cells. Methods and Results: Inside-out patches were exposed to zero, or low, [ATP] to activate KATP channels. Glibenclamide did not affect single channel conductance, but reversibly reduced channel open probability from either side of the membrane. Internal (cytoplasmic) glibenclamide inhibited with half-maximal inhibitory [glibenclamide] = 6 μM, Hill coefficient = 0.35. Complete channel inhibition was not observed, even at 300 μM [glibenclamide]. The response to step increases of internal [glibenclamide] could be resolved into two phases of channel inhibition (t1/2, fast, 〈 1 sec, t1/2, slow= 10.5 ± 0.9 sec, n = 8). Step decrease of [glibenclamide] caused a single resolvable phase of reactivation (t1/2= 20.4 ± 0.7 sec, n = 16). Channel inhibition by internal glibenclamide could be relieved by ADP, but only in the presence of Mg2+. Conclusion: Glibenclamide can inhibit KATP channels from either side of the membrane, with block from one side being competitive with block from the other. Internal MgADP antagonizes the blocking action of glibenclamide. Glibenclamide inhibition of cardiac KATP channels differs quantitatively and qualitatively from the inhibition of pancreatic KATP channels.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Optical and quantum electronics 25 (1993), S. 185-193 
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We study for the first time the evolution of the guided field in a 1×7 fibre coupler with a third-order nonlinearity. An analytical solution of the nonlinear coupled-mode equations is presented in terms of the Weierstrass function. In particular, we found that contrary to the equal power distribution in the linear limit, a cross-state appeared if the coupler was initially excited in the central core and a certain input power was chosen. Finally, we analyse the far-field pattern of the coupler output.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1438-2385
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Description / Table of Contents: Abstract In the course of the Maillard reaction, labile sugar degradation products are formed that are susceptible to secondary reactions and therefore have a decisive influence on the product spectrum. Such reactive intermediates may be transformed into stable derivatives with trapping reagents, and thus be protected from further reactions. Secondary processes may also be forestalled if the primary products are removed from the reaction mixture by high-vacuum distillation. By this procedure, 5-hydroxymethyl- and 5-(1,2-dihydroxyethyl)-3(2H)-furanone have been identified directly from Maillard reaction mixtures for the first time. The activated methylene group of these 3(2H)-furanones can easily enter into condensation reactions. The coloured condensation products in turn react with primary amines to pyrrolinone derivatives, which may also contribute to the colouring observed in non-enzymatic browning.
    Notes: Zusammenfassung Im Verlauf der Maillard-Reaktion kommt es zur Bildung labiler Zuckerabbauprodukte, die leicht Folgereaktionen eingehen und somit entscheidenden Einfluß auf das Produktspektrum haben. Mit Abfangreagentien können solche reaktiven Zwischenstufen in stabile Derivate überführt und so vor weiteren Umsetzungen geschützt werden. Folgereaktionen lassen sich auch unterbinden, wenn man die Primärprodukte im Hochvakuum destillativ aus dem Umsetzungsgemisch entfernt. Auf diese Weise wurden erstmals 5-Hydroxymethyl- und 5-(1,2-Dihydroxyethyl)-3(2H)-furanon direkt aus Maillard-Reaktionsgemischen nachgewiesen. Diese 3(2H)-Furanone gehen aufgrund ihrer methylenaktiven CH2-Gruppe leicht Kondensationsreaktionen ein. Die farbigen Kondensationsprodukte reagieren wiederum mit primären Aminen zu Pyrrolinonderivaten, die ihrerseits zur Farbbildung beitragen können.
    Type of Medium: Electronic Resource
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  • 8
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    Detroit, Mich. : Periodicals Archive Online (PAO)
    Technology and Culture. 34:4 (1993:Oct.) 929 
    ISSN: 0040-165X
    Topics: Technology
    Description / Table of Contents: BOOK REVIEWS
    Notes: Biomedical and Behavioral Technology
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  • 9
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    Unknown
    Baltimore, Md. : Periodicals Archive Online (PAO)
    Bulletin of the history of medicine. 67:3 (1993:Fall) 618 
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  • 10
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A complementary DNA encoding an ATP-regulated potassium channel has been isolated by expression cloning from rat kidney. The predicted 45K protein, which features two potential membrane-spanning helices and a proposed ATP-binding domain, represents a major departure from the basic structural design ...
    Type of Medium: Electronic Resource
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