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  • 1985-1989  (5)
  • 1935-1939  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Surface Migration of Ions and Contact Exchange. (1939)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 43 (1939), S. 1185-1196 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150396a010
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cadmium and zinc concentrations in fetal and maternal rat tissues after parenteral administration of cadmium during pregnancy (1988)
    Springer
    Archives of toxicology 62 (1988), S. 285-290 
    Details
    ISSN: 1432-0738
    Keywords: Cadmium ; Zinc ; Rat placenta ; Rat liver ; Fetal liver ; Pregnancy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Cadmium (Cd) and zinc (Zn) concentrations were determined by solid sampling atomic absorption spectrometry (AAS) in rat maternal and fetal tissues after exposure to cadmium. Cadmium was administered subcutaneously as CdCl2 in saline daily during pregnancy. Two experiments were performed. In expt. I we investigated the tissue concentration at day 19 (gestational age) after administration of several doses: 0, 1.1, 2.2, 4.4, and 8.8 μmol Cd/kg/ day. In expt. II the course of the Cd and Zn concentrations during pregnancy was investigated by collecting samples at days 14, 16, 18 and 20, after daily injections of 4.4 μmol Cd/kg. Cadmium concentrations in blood, maternal liver, placenta and fetal liver increased with dose and duration of exposure. Cadmium was heavily accumulated in the liver and transferred to the fetus only in small amounts. The zinc concentration in the maternal liver was positively correlated with the cadmium concentration. In the placenta the zinc concentration was not affected. Zinc in fetal liver was decreased from day 18 onward. Despite relatively high cadmium levels and decreased zinc levels in the fetus, we observed no adverse effects on various reproduction parameters, such as birth weights and obvious malformations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332488
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of cadmium exposure during pregnancy on cadmium and zinc concentrations in neonatal liver and consequences for the offspring (1989)
    Springer
    Archives of toxicology 63 (1989), S. 38-42 
    Details
    ISSN: 1432-0738
    Keywords: Cadmium ; Zinc ; Neonate ; Thymus ; Birth weight ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effects of cadmium exposure during pregnancy (by means of daily subcutaneous injections of 4.4 μmol/kg to the mother) on the neonates were investigated. No effect was observed on fetal or neonatal body weights, nor on neonatal liver weights. These parameters were examined up to 5 weeks after birth. The weight of neonatal thymuses was decreased 7 and 14 days after birth due to cadmium exposure of the mothers as compared with controls. This may be caused by zinc deficiency, because zinc concentrations in fetal and neonatal livers after cadmium exposure were found to be very low 20 days after conception and 5 h after birth. Cadmium concentration in neonatal liver decreased; however, cadmium in malignant liver increased as age increased. In the mother, cadmium was transferred to the milk, as it was demonstrated in the stomach contents of the pups. Simultaneous administration of zinc in amounts equimolar to cadmium did not have any noticeable effect on the amount of cadmium transferred to the fetus or on cadmium concentrations in any of the organs investigated. It could not prevent zinc deficiency in fetal and neonatal liver. In addition, growth retardation of the thymus from exposed pups could not be prevented by zinc administration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00334632
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Physical properties of icosahedral and glassy Pd−U−Si alloys (1987)
    Springer
    The European physical journal 68 (1987), S. 313-324 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The transformations of glassy Pd60U20Si20 alloys into an icosahedral state with quasicrystalline order and into the crystalline state have been studied by differential scanning calorimetry and X-ray diffraction. In addition, the electrical resistivity, the Hall coefficient and the magnetic susceptibility have been measured to high temperatures. The electronic structure has been investigated by photoelectron spectroscopy and the top surface layers have been probed by ion scattering spectroscopy. The physical properties in the icosahedral and glassy phase are similar. Comparisons with other uranium rich or dilute alloys are made in order to study the valence change or the development of a magnetic moment for uranium. Finally, the novel scanning tunneling microscope has been used to study the topography and the local tunneling barrier height with the aim of correlating micromorphology with local chemical structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01304246
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Direct determination of cadmium in placenta. Comparison with a destruction atomic absorption spectrometric method (1985)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 322 (1985), S. 743-746 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A comparison of performance characteristics of a destruction ETA-AAS method and the solid sampling ETA-AAS method experienced in analyzing cadmium in placenta is described. The accuracy of both methods is good; the precision of the destruction method was better. It was concluded that the direct method was preferable for the determination of cadmium in placenta and other tissues as it has a higher speed of analysis and is less sensitive to contamination. Problems with both methods are mentioned and homogenization of samples is shortly described.
    Notes: Zusammenfassung Die Leistungsfähigkeit einer ETA-AAS-Methode mit Aufschluß wird verglichen mit derjenigen einer Feststoff-ETA-AAS-Methode. Die Richtigkeit beider Verfahren ist gut, während die Präzision bei der Methode mit Aufschluß besser ist. Es wurde der Schluß gezogen, daß die direkte Methode zur Cadmiumbestimmung in Placenta und anderen Geweben vorzuziehen ist, da sie eine größere Analysengeschwindigkeit bietet und geringere Störanfälligkeit gegenüber Verunreinigungen aufweist. Probleme, die bei beiden Verfahren auftauchen, werden aufgezeigt. Die Homogenisierung der Probe wird kurz beschrieben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00490555
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Neutral carrier based silicone rubber membranes for H3O+, K+, NH4 + and Ca2+ selective electrodes (1985)
    Springer
    Microchimica acta 85 (1985), S. 33-38 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung In ionenselektiven Elektroden auf der Basis von neutralen Carriern läßt sich Silikongummi als universelle Membranmatrix einsetzen. Entsprechende Sensoren sind sowohl mit ionenselektiven Antibiotika als auch mit synthetischen Carriern realisiert worden. Ihre Selektivitäten übertreffen teilweise jene von entsprechenden PVC-Membranen. Die Permeabilität der Silikongummimembranen für Gasmolekel ist ungefähr zehnmal höher als jene von PVC-Membranen. Andererseits ist die elektrische Leitfähigkeit um einen Faktor 10–100 niedriger.
    Notes: Summary Silicone rubber is a universal membrane matrix for neutral carrier based ion-selective electrodes. Carrier antibiotics as well as synthetic ionophores yield sensors with selectivities that are comparable or even higher than those of corresponding poly(vinyl chloride) (PVC) membrane systems. The permeability of silicone rubber membranes for gas molecules is about ten times higher than the permeability of PVC membranes. In contrast, the electrical conductivity is by a factor of 10–100 lower.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01199925
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    Paper (German National Licenses)
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