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  • Chemistry  (3)
  • DNA excision repair  (2)
  • Exocrine pancreas
  • bile salt
  • 1
    Electronic Resource
    Electronic Resource
    Enhancing effects of cinoxate and methyl sinapate on the frequencies of sister-chromatid exchanges and chromosome aberrations in cultured mammalian cells
    Amsterdam : Elsevier
    Mutation Research/Fundamental and Molecular Mechanisms of Mutagenesis 212 (1989), S. 213-221 
    Details
    ISSN: 0027-5107
    Keywords: Chromosome aberrations ; Cinoxate ; DNA excision repair ; Enhancing effect ; Methyl sinapate ; SCEs ; UV
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0027-5107(89)90072-9
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  • 2
    Electronic Resource
    Electronic Resource
    Inorganic cadmium increases the frequency of chemically induced chromosome aberrations in cultured mammalian cells
    Amsterdam : Elsevier
    Mutation Research Letters 302 (1993), S. 137-145 
    Details
    ISSN: 0165-7992
    Keywords: Cadmium ; Chromosome aberrations ; Co-clastogenesis ; DNA excision repair
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0165-7992(93)90039-X
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  • 3
    Electronic Resource
    Electronic Resource
    Transport of monooleoylglycerol mediated by bile salt micelles across porous membranes (1995)
    Springer
    Colloid & polymer science 273 (1995), S. 701-707 
    Details
    ISSN: 1435-1536
    Keywords: Mixed micelle ; bile salt ; monoacylglycerol ; transport ; porous membrane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In order to study how the bile salts and lipids behave in the vicinity of microvillus, the transport properties of a sodium salt of deoxycholic acid (NaDC) and its mixture with monooleoylglycerol (MO) through artificial membranes were investigated in 0.15 M NaCl saline solution at 37°C. The hydrodynamic radius of MO-solubilized micelles was estimated to be approximately 17–20 Å from the transport study. The thermodynamically stable MO-NaDC mixed micelles formed above critical micelle concentration in the higher region of mole fraction of NaDC in the mixture (X NaDC〉ca. 0.6), can behave as a single species in transport process and freely pass through the porous membranes of both pore sizes, 0.01 μm and 0.1 μm. The permeabilities of MO-NaDC mixed micelles are large compared with those of pure NaDC micelles. MO molecules solubilized may probably enhance the interaction between MO and NaDC molecules by better contacting with the respective hydrophobic groups in a mixed micelle (the flexible structure of MO molecule enables it), and in this situation, the smaller micelles compared with those of pure NaDC must be more favorable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652264
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  • 4
    Electronic Resource
    Electronic Resource
    Solubilization and precipitation of cholesterol in aqueous solution of bile salts and their mixtures (1995)
    Springer
    Colloid & polymer science 273 (1995), S. 675-680 
    Details
    ISSN: 1435-1536
    Keywords: Solubilization ; surface tension ; bile salt ; cholesterol ; mixed micelle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Solubilization of cholesterol by mixed micelles of sodium chenodeoxycholate with sodium ursodeoxycholate was investigated in carbonate-tetraborate buffer (Kolthoff) solution at pH 10 and 37°C. It was found that the mixing of the two bile salts gives a negatively synergetic effect on solubilization of cholesterol. The solubilizing power of bile salts for cholesterol was remarkably influenced with the change in mole fraction of sodium ursodeoxycholate (X UDC). The behavior of bile salt solutions saturated with cholesterol was examined by measuring the surface tension. Two break points were observed in the curves of surface tension vs. concentration. The break points seem to correspond to a CMC in the absence of solubilized cholesterol and another CMC in the presence of solubilized cholesterol inside bile salt micelle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652260
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of saturated fatty acids on amylase release from exocrine pancreatic segments of sheep, rats, hamsters, field voles and mice (1996)
    Springer
    Journal of comparative physiology 166 (1996), S. 305-309 
    Details
    ISSN: 1432-136X
    Keywords: Exocrine pancreas ; Fatty acids ; Amylase release ; Sheep ; Rats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Stimulatory effects of saturated fatty acids consisting of 4 (butyrate), 8 (octanoate), 12 (laurate) and 16 (palmitate) carbon atoms, as well as acetylcholine on pancreatic amylase release were assessed in tissue segments isolated from sheep, rats, hamsters, field voles and mice. The amount of amylase release induced by the fatty acids (1 μmol·l−1 to 10 mml·l−1) and by acetylcholine (10 nmol·l−1 to 100 μmol·l−1) increased in a concentration-dependent manner, and the maximum response in response to the fatty acids was obtained at the maximal dose used. The maximum increase in amylase release in response to butyrate or octanoate was highly and significantly (r=0.974,P〈0.001) dependent on the log value of the mean body mass in the following order: sheep 〉 rats 〉 hamsters 〉 field voles 〉 mice. On the other hand, the response to laurate and palmitate was variable among animal species. Addition of atropine (1.4 μmol·l−1) to the medium did not reduce the responses to octanoate stimulation, but significantly reduced acetylcholine-induced responses implying that the effects of the fatty acids were not mediated through activation of muscarinic acetylcholine receptors. Reduction of calcium ion concentration in the medium significantly inhibited the responses induced by the fatty acids and acetylcholine, suggesting that amylase release depends on extracellular calcium ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02439916
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  • 6
    Electronic Resource
    Electronic Resource
    Hochtemperaturphosphidierung von Eisen-Nickellegierungen mittels Phosphordampf (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 487 (1982), S. 232-240 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: High Temperature Phosphidation of Iron-Nickel Alloys by Phosphorus VaporA study was undertaken concerning the products and kinetics in the phosphidation of iron-nickel alloys with various ratios of metallic constituents at 700° in phosphorus vapor at 1 atm by a sealed-tube method. X-ray diffraction patterns and an electron microprobe analysis of the products showed that the phosphide-layer structure reaches the expression of NiP2 ∼ Ni6P5/Ni2P, Fe2P/(Fe—Ni alloy). The phosphidations proceeded according to a parabolic rate law for all the compositions of the alloy. A marker experiment indicated that the diffusing species was not phosphorus but metals. The rate constant decreased with an increase in the content of iron in the alloy.
    Notes: Reaktionsprodukte und Kinetik bei der Phosphidierung von Eisen-Nickellegierungen verschiedener Zusammensetzung bei 700° in Phosphordampf (1 atm) im geschlossenen Quarzrohr wurden untersucht. Aus Röntgenbeugungsbildern und Elektronenstrahlmikrosondeanalysen der Produkte folgt, daß sich Phosphidschichten von NiP2 ∼ Ni6P5/Ni2P, Fe2P/(Fe—Ni-Legierung) bilden. Die Phosphidierungen an Legierungen aller Zusammensetzungen verliefen nach dem parabolischen Zeitgesetz. Ein Markierungsversuch zeigte, daß nicht der Phosphor, sondern die Metalle diffundieren. Die Geschwindigkeitskonstante nahm mit zunehmendem Eisengehalt der Legierung ab.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19824870122
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  • 7
    Electronic Resource
    Electronic Resource
    Über die Phosphidierung des Nickels durch Phosphortrichlorid (1973)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 396 (1973), S. 319-327 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Phosphidation of Nickel by Phosphorus TrichlorideThe phosphidation of nickel sheets by phosphorus trichloride vapor of 30 and 50 Torr has been studied kinetically by gravimetric means in the temperature range of 400-650°C in hydrogen atmosphere. The phosphidation proceeded generally according to the parabolic rate law. The parabolic rate constant increased with an increase of temperature, and its temperature dependence yielded the activation energies of about 33 and 47 kcal/mole for 400-550 and 550-650°C, respectively. X-ray and electron microprobe analyses showed that surfaces of the specimens phosphidized are made up of mixtures of Ni2P and Ni6P5, and that at the phosphide/metal interface the compound Ni2P is formed. The experiments using argon as carrier gas resulted in the formation of both the phosphides and the chlorides, and this fact could be explained in terms of thermodynamics.
    Notes: Die durch Phosphortrichloriddämpfe von 30 sowie 50 Torr bewirkte Phosphidierung von Nickelblechen wird im Temperaturbereich von 400-650°C in Wasserstoffatmosphäre kinetisch mittels gewichtsanalytischer Bestimmung untersucht. Die Phosphidierung verläuft im allgemeinen nach dem parabolischen Geschwindigkeitsgesetz. Die entsprechende Geschwindigkeitskonstante steigt mit zunehmender Temperatur, und ihre Temperaturabhängigkeit ergibt die Aktivierungsenergien von rund 33 und 47 kcal/Mol für 400-550 bzw. 550-650°C. Röntgenbeugungsbilder und röntgenmikroanalytische Untersuchungen zeigen, daß die Oberflächen der phosphidierten Proben aus Mischungen von Ni2P und Ni6P5 bestehen, und daß sich an der Grenzfläche Phosphid/Metall die Verbindung Ni2P gebildet hat. Versuche mit Argon als Trägergas führen zur Bildung der Phosphide und Chloride, was thermodynamisch erklärt wird.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19733960311
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  • 8
    Electronic Resource
    Electronic Resource
    Phosphidierung von Wolframmetall (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 561 (1988), S. 185-191 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphidation of Tungsten MetalA study was undertaken concerning the phosphidation of tungsten at 800, 900, and 1000°C in phosphorus vapor at 1 atm by a sealed-tube method. X-ray diffraction patterns and an electron probe microanalysis of the products showed that all the phosphide films were composed of two layers, that is, their outer layers were composed of WP2 and their inner layers composed of WP. All the phosphidation reactions proceeded according to a parabolic rate law. The parabolic rate constant was given as a function of the absolute temperature by the following expression. Kp = 3.06X10-5 exp(-103 KJ mol-1/RT) kg2m-4s-1, (1 atm, 1073-1273 K). Tungsten metal was appreciably superior to iron, nickel, and chromium, which are the main constituent metals of stainless steel, and titanium with respect to phosphidation resistance.
    Notes: Die Reaktion von Wolframmetall bei der Phosphidierung bei 800, 900 und 1000°C in Phosphordampf (1 atm) wurde im geschlossenen Quarzrohr untersucht. Aus Röntgenbeugungsbildern und Elektronenstrahl-Mikroanalysen der Produkte folgt, daß alle Phosphidfilme aus zwei Schichten bestanden, ihre Außenschichten bestanden aus WP2 und ihre Innenschichten aus WP. Alle Phosphidierungsreaktionen verliefen nach dem parabolischen Zeitgesetz. Die parabolische Geschwindigkeitskonstante als Funktion der absoluten Temperatur lautet Kp = 3,06X10-5 exp(-103 KJ mol-1/RT) kg2m-4s-1, (1 atm, 1073-1273 K). Wolframmetall ist „phosphorfester“ als Eisen, Nickel und Chrom, welche Hauptbestandteile der nichtrostenden Stähle sind, und Titan.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885610120
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