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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Inorganic chemistry 5 (1966), S. 1071-1074 
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 41 (1985), S. 1052-1054 
    ISSN: 1420-9071
    Keywords: Cardiac muscle ; phylogenesis ; sarcoplasmic reticulum ; phospholamban ; protein kinase ; Ca2+-transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Phospholamban, a sarcoplasmic reticulum phosphoprotein, is present in the hearts of mammalian, avian, amphibian, and fish species. Phylogenetic changes are indicated by marked differences among species in cardiac phospholamban content and by the absence of Ca2+/calmodulin-dependent phospholamban phosphorylation at an early developmental stage.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1440
    Keywords: Bisacodyl ; contractility ; human colonic smooth muscle ; in vitro ; Bisacodyl ; Kontraktilität ; menschlicher Dickdarmmuskel ; in vitro
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung An isolierten Muskelstreifen des menschlichen Dickdarms wurde die tonussteigernde Wirkung des Bisacodyl (4,4-Diacetyl-bis-hydroxyphenyl-pyridyl-(2)-methan, Dulcolax®) untersucht. Der maximale kontraktionssteigernde Effekt von 10 µg/ml Bisacodyl ist mit dem von 1 µg/ml Acetylcholin, 1 µg/ml Histamin und 0,5 µg/ml Nicotin vergleichbar. Er wird nur später erreicht und ist weder durch das Anticholinergicum Atropin, das H1-Antihistaminicum Diphenhydramin noch den Nervenblocker Tetrodotoxin aufhebbar. Dagegen bleibt nach Vorbehandlung mit dem Calciumantagonisten Verapamil Bisacodyl wirkungslos. Die Befunde zeigen, daß dem Bisacodyl ein direkter Angriffspunkt an der glatten Muskelzelle des menschlichen Colons zukommt.
    Notes: Summary The effects of bisacodyl (4,4-diacetyl-bis-hydroxy-phenyl-pyridyl-(2)-methan, Dulcolax®) on the tone of isolated muscle strips of human colon were examined. Maximal contractions achieved by 10 µg/ml of bisacodyl were quite comparable to those due to 1 µg/ml of acetylcholine, 1 µg/ml of histamine and 0.5 µg/ml of nicotine, respectively. However, peak contractions were attained with a greater latency and could not be prevented by the anticholinergic agent atropine, the H1-antihistaminic diphenhydramin or tetrodotoxin blocking axonal conduction. On the other hand, pretreatment with verapamil — antagonizing calcium influx into the muscle cell — abolished bisacodyl effects. These results provide evidence for a direct action of bisacodyl on smooth muscle cells of human colon.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0630
    Keywords: 61.80.Ba ; 52.75.-d ; 81.60.Bn ; 76.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Armco iron samples were surface nitrided by irradiating them with pulses of an excimer laser in a nitrogen atmosphere. The resulting nitrogen depth profiles measured by Resonant Nuclear Reaction Analysis (RNRA) and the phase formation determined by Conversion Electron Mössbauer Spectroscopy (CEMS) were investigated as functions of energy density and the number of pulses. The nitrogen content of the samples was found to be independent of the number of pulses in a layer of 50 nm from the surface and to increase in depths exceeding 150 nm. The phase composition did not change with the number of pulses. The nitrogen content can be related to an enhanced nitrogen solubility based on high temperatures and high pressures due to the laser-induced plasma above the sample. With increasing pulse energy density, the phase composition changes towards phases with higher nitrogen contents. Nitrogen diffusion seems to be the limiting factor for the nitriding process.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 61 (1995), S. 1-5 
    ISSN: 1432-0630
    Keywords: PACS61.80.Ba; 52.75. $-$d; 81.60.Bn; 76.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Armco iron samples were surface nitrided by irradiating them with pulses of an excimer laser in a nitrogen atmosphere. The resulting nitrogen depth profiles measured by Resonant Nuclear Reaction Analysis (RNRA) and the phase formation determined by Conversion Electron Mössbauer Spectroscopy (CEMS) were investigated as functions of energy density and the number of pulses. The nitrogen content of the samples was found to be independent of the number of pulses in a layer of 50 nm from the surface and to increase in depths exceeding 150 nm. The phase composition did not change with the number of pulses. The nitrogen content can be related to an enhanced nitrogen solubility based on high temperatures and high pressures due to the laser-induced plasma above the sample. With increasing pulse energy density, the phase composition changes towards phases with higher nitrogen contents. Nitrogen diffusion seems to be the limiting factor for the nitriding process.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 308-311 (May 1999), p. 459-466 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 169 (1952), S. 931-932 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the course of an investigation of the extracts from Aspergillus niger, we have been able to show with certainty at least four different polygalacturonases in the same culture extract. We heated a culture liquid of A. niger containing polygalacturonase at pH. 4-2 to 50 C. and determined at ...
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 3324-3327 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report electrical measurements on structures generated by δ doping the AlGaAs barriers of a GaAs quantum well. These structures are made unique by quantum size effects that occur both in the δ-doped barrier and in the GaAs well. Both the Hall-effect and capacitance-voltage measurements reveal that high-density, 4×1012 cm−2, two-dimensional electron gas forms in the well along with good mobility. We fabricate field-effect transistors with this structure to obtain transconductances of 300 mS/mm.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 1578-1580 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using triethylgallium and arsine, high-quality GaAs can be grown at a relatively low substrate temperature of 500 °C by chemical beam epitaxy. Such a low temperature has the advantage of a negligible Si diffusion effect. Capacitance-voltage (C-V) measurements of the Si δ-doped GaAs show extremely narrow profile widths of 22 A(ring) at 300 K and 18 A(ring) at 77 K, indicating a very high degree of Si spatial localization has been achieved. The subsequent annealing experiments reveal that significant Si segregation and diffusion exist at a high growth temperature of ∼600 °C, usually employed in conventional molecular-beam epitaxy. The C-V widths of the annealed δ-doped structures also provide an excellent measure to determine the Si diffusion constant in GaAs.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of medicinal chemistry 23 (1980), S. 1222-1226 
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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