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  • 1
    Electronic Resource
    Electronic Resource
    Light-induced Mn2+ influx in Limulus ventral photoreceptors (1998)
    Springer
    Journal of comparative physiology 183 (1998), S. 193-202 
    Details
    ISSN: 1432-1351
    Keywords: Key words Fura-2 ; Fluorescence ; Limulus ventral photoreceptors ; Mn2+ ; Calcium influx
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract In contrast to insect species, light-activated influx of divalent ions into Limulus ventral photoreceptors has proven difficult to demonstrate. We used the quench of the fluorescent indicator dye, fura-2, to measure Mn2+ influx. Limulus ventral photoreceptors were injected with fura-2 and excited at 360 nm. When the photoreceptors were bathed in 1 mmol · l−1 Mn2+, an approximately 1% per 10 s decline in the fura-2 fluorescence during intervals between 50-ms flashes was taken as a measure of Mn2+ entry in darkness. Fluorescence decline during 10-s flashes was used to monitor Mn2+ entry during the photoresponse. During the 10-s flashes we observed a small rapid decline of the fura-2 fluorescence even in the absence of Mn2+. This reflected a contamination of the fluorescence signal arising from light-induced release of intracellular calcium stores. A subsequent slower decline in fluorescence during the 10-s flash, amounting to approximately 9% per 10 s, was only observed in the presence of extracellular Mn2+ and was attributed to Mn2+ influx. This light-activated influx was not through voltage-gated calcium channels since it persisted under voltage clamp, was not stimulated by depolarizing current injections, nor blocked by NiCl2. Depletion of internal calcium stores by cyclopiazonic acid treatment did not accelerate Mn2+ influx.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003590050247
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  • 2
    Electronic Resource
    Electronic Resource
    Investigation into the interactions of metals and metal ions in polymer matrices (1986)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 144 (1986), S. 51-72 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurde die Dispersion von Solen einiger übergangsmetalle (Gold, Eisen(III)-oxid · H2O, Chromhydroxid) in einem wasserlöslichen Polymeren (PVA 4-88) untersucht und von den daraus hergestellten Filmen ein Vergleich ihrer mechanischen und elektrischen Eigenschaften gemacht. In Erweiterung auf nichtwäßrige Lösungsmittel (Dimethylformamid, Tetrahydrofuran) wurden die Wechselwirkungen von mehrwertigen Metallionen (Fe(III), Al(III), Ti(IV), Zr(IV), Pd(O), Ag(O), Au-Sole) mit einem spezifischen metallkomplexierenden Polymeren (Polyacrylamidoxim) und einem Blockcopolymeren, das Styrol und Butadien (Buna BL 6533) enthält, untersucht.
    Notes: The dispersion of transition metal sols (gold, ferric hydrous oxide, chromium hydroxide) in a water soluble polymer (PVA 4-88) was investigated and from the films produced, a comparison made of their mechanical and electrical properties. Extending to non aqueous solvents (dimethylformamide, tetrahydrofuran) interactions of polyvalent metal ions (Fe(III), Al(III), Ti(IV), Zr(IV), Pd(0), Ag(0), Au sols) with a specific metal complexing polymer (poly(acrylamideoxime)) and a block copolymer containing styrene and butadiene (Buna BL 6533) were investigated.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1986.051440105
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  • 3
    Electronic Resource
    Electronic Resource
    Generation of crystal structures of acetic acid and its halogenated analogs (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 19 (1998), S. 1-20 
    Details
    ISSN: 0192-8651
    Keywords: crystal structure prediction ; polymorphism ; atom-atom potential method ; force fields ; crystal structure solution ; Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Computer Science
    Notes: The approach of Karfunkel and Gdanitz has been used to predict possible crystal structures of acetic acid and three of its monohalogenated analogs starting with the molecular structure alone. The results demonstrate that this approach is capable of finding many, if not all, of the possible packing arrangements of molecules of this size, but that it is not currently capable of correctly ranking these structures in terms of their enthalpy. This deficiency is probably due to inadequacies in the force field used to minimize the structures. The inadequacies relate to the description of acidic hydrogen bonds and halogen-halogen interactions.   © 1998 John Wiley & Sons, Inc.   J Comput Chem 19: 1-20, 1998
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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