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Light-induced Mn2+ influx in Limulus ventral photoreceptors (1998)

Hsiao, H. S. ; Payne, R.

Springer

Journal of comparative physiology 183 (1998), S. 193-202

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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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Investigation into the interactions of metals and metal ions in polymer matrices (1986)

Payne, R. ; Fritz, G. ; Naarmann, H.

Weinheim : Wiley-Blackwell

Angewandte Makromolekulare Chemie 144 (1986), S. 51-72

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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.