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  • 1980-1984  (10)
  • 1
    Digitale Medien
    Digitale Medien
    s.l. : American Chemical Society
    Journal of the American Chemical Society 105 (1983), S. 1734-1737 
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    facet.materialart.
    Unbekannt
    The Hague : Periodicals Archive Online (PAO)
    International journal for the philosophy of religion. 14:1 (1983) 33 
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  • 3
    facet.materialart.
    Unbekannt
    The Hague : Periodicals Archive Online (PAO)
    International journal for the philosophy of religion. 16:2 (1984) 111 
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  • 4
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The internal K+ concentration in the marine flagellate Dunaliella marina has been found to be 4.8 to 5.5 times higher than in the extracellular fluid. D. marina cells transferred to isotonic media with Na+ replaced by K+ initially swell, but tend to establish a new constant volume at a higher level depending on the K+ concentration. D. marina cells transferred to hypotonic media with elevated K+ show: (1) an initial phase of swelling, (2) a cell volume regulatory phase in which the rate of volume readjustment is progressively slower as the concentration of K+ in the media becomes higher, followed by (3) a swelling phase in which the cells establish a new constant volume progressively higher as the K+ concentration becomes higher. Transfer of D. marina from 30‰ S to hypotonic medium of 15‰ S results in loss of 20 to 30% of total intracellular K+ content during the following 90 min. In hypertonic media elevated K+ does not influence volume regulation. It is suggested that K+ is the volume-regulating factor in hypotonic media and Na+ in hypertonic media. The measured changes in steady-state volume in D. marina transferred to media with elevated K+ is consistent with the “pump and leak” hypothesis, and the mechanism of volume regulation in anisotonic media is found to be comparable to that in animal cells. The inhibitory effect of copper on volume regulation in hypotonic media is reduced when Na+ is replaced by Cholin-Cl and it is suggested that the effect of copper is to increase the permeability to Na+ which enters the cell and makes it stay swollen. The instantaneous shrinkage in D. marina cells transferred to hypertonic media with copper becomes smaller and the initial rate of volume readjustment faster and the new steady-state volume progressively bigger as the copper concentrations becomes higher; probably due to increased permeability to Na+. The effect of 5 ppm copper concentrations on volume regulation mechanism in hypotonic media is influenced by pH and EDTA: (1) at pH 8.4 volume regulation is completely inhibited while volume readjustment takes place at pH 7.5 and 6.5. Change in pH from 8.4 to 7.5 in the volume readjustment phase suspends complete inhibition 5 min, but not 30 min after transfer of flagellate cells to hypotonic media (2) when the synthetic chelator EDTA is added in the volume readjustment phase the inhibiting effect of copper is to a certain degree suspended, less pronounced the later it is added. This work shows that the inhibiting effects of copper on volume regulation mechanism is influenced by the copper speciation.
    Materialart: Digitale Medien
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  • 5
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Seven fully anaesthetized pigs (12-35 kg) were used in the experiments. One pig was exposed in the first experiment, and two pigs in each of the following three experiments. Each pig was exposed to heat energy on the left side of the body and to electrical energy on the right side7. The areas of ...
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Hyperfine interactions 15 (1983), S. 491-494 
    ISSN: 1572-9540
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Implantations of F in crystalline Ge has been examined by the DPAD method. Two unique fluorine EFG sites are found. The results show a strong resemblance to similar data obtained earlier for Si, e.g., in either host an axial symmetric EFG oriented along the 〈111〉 crystal direction is observed, also the temperature dependences of site populations follow similar trends. A thorough comparison of the Ge and Si data is given.
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    Hyperfine interactions 10 (1981), S. 747-750 
    ISSN: 1572-9540
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 8
    ISSN: 1572-9540
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A theoretical investigation of the electric field gradient at excited nuclei19F*(I=5/2) of the tetrafluorides CF4, SiF4, and GeF4, has been carried out using the Self-Consistent Charge Extended Hückel procedure to obtain the electronic wave functions. The values of ¦e2qQ¦ that have been obtained are 50.3, 30.4, and 36.3 MHz for CF4, SiF4, and GeF4, respectively, agreeing with the trend in recent experimental data. Physical reasons are presented for the trend, which is irregular as compared to expectations from Townes-Dailey Theory which would have predicted a continuus decrease in going from CF4 to GeF4.
    Materialart: Digitale Medien
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  • 9
    Digitale Medien
    Digitale Medien
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 34 (1983), S. 547-556 
    ISSN: 0947-5117
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Beschreibung / Inhaltsverzeichnis: Einfluß der Rohrqualität auf die Korrosion feuerverzinkter HauswasserleitungenDurch vergleichende Untersuchungen sollte die Korrosion von verzinkten Rohrleitungen 8 verschiedener Hersteller in Kalt- und Warmwasserleitungen bestimmt werden. In die Untersuchungen wurden auch zwei verschiedene Arten von Fittings und zwei verschiedene Verbindungsverfahren einbezogen. Die Untersuchungen von insgesamt 15 Monaten Dauer wurden unter Simulierung praxisnaher Bedingungen durchgeführt. Das verwendete Wasser war verhältnismäßig hart (ziemlich hoher Salzgehalt) und hatte in der Praxis zu Lochkorrosion von verzinkten Rohren geführt.Die Untersuchungen bestätigten, daß die Korrosion nur sehr wenig von der Qualität der Rohrleitungen abhängt; eine Ausnahme sind nur Rohre mit sehr dünner Zinkschicht und Rohre, die nur eine Legierungsschicht, hingegen keine reine Zinkschicht besitzen. Diese Rohre waren eindeutig schlechter beständig.Zwischen den beiden Fitting-Typen und Verbindemethoden ließen sich experimentell keine Unterschiede feststellen.Rohre, in denen ständig Warmwasser zirkulierte, wurden insgesamt stärker angegriffen als Kaltwasserrohre oder Rohre mit stagnierendem Warmwasser. Die stärkste Lochkorrosion trat jedoch in einem Kaltwasserrohr auf.In Verbindung mit den experimentellen Untersuchungen wurden auch die Blei- und Cadmiumgehalte in den Zinküberzügen und in Proben des verwendeten Wassers bestimmt; ebenfalls bestimmt wurden der Zink- und Kupfergehalt in Wasser.
    Notizen: Experiments were made for the purpose of comparing corrosion in galvanized pipes of eight different makes in hot and cold domestic water. Fittings of two makes and two methods of jointing were also compared. Experiments were made throughout a period of 15 months under conditions closely simulating conditions in practice. The water used was relatively hard with fairly high salt content and had in practice caused pitting corrosion in galvanized pipes.The experiments confirmed that corrosion of pipes is only to a slight extent influenced by the pipe quality. The only exception was galvanized pipes with a thin coating and with no layer of pure zinc. These pipes seemed clearly to be less resistant.The experiments disclosed no difference between the two types of fittings or between the two jointing methods.Pipes in which hot water circulated continuously showed on the whole more corrosion than pipes with cold water or with hot water without circulation. However, the most serious case of pitting corrosion was observed in a cold water pipe.In connection with the experiments lead and cadmium were determined in the zinc coatings from the pipes and in water samples from the experimental set-up. Contents of zinc and copper in the water samples were also determined.
    Zusätzliches Material: 21 Ill.
    Materialart: Digitale Medien
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  • 10
    ISSN: 0192-253X
    Schlagwort(e): Drosophila ; electrophoretic variation ; quantitative variation ; ecology ; Life and Medical Sciences ; Genetics
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie
    Notizen: Electrophoretic variation at three enzyme loci-alcohol dehydrogenase (Adh), glycerophosphate dehydrogenase (Gpdh), triosephosphate isomerase (Tpi)- is compared in Australian Drosophila melanogaster populations at three levels of spatial heterogeneity; among breeding sites, within populations, and between populations at the geographic level. Heterogeneity at the breeding site level greatly exceeds that among adults within populations, indicating greater intermixing at the mobile adult stage than at the developmentally immature and less migratory larval stage. Heterogeneity at the microspatial level is large relative to the geographic level at two of these loci.Spatial patterns of variation in ecological phenotypes are also considered. It is argued that electrophoretic variants may contribute little to an understanding of this quantitative variation, and that a more useful approach in ecological genetics is to consider ecological phenotypes as primary data.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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