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1976 (1)
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1Author    H. Stieve, M. HananiRequires cookie*
 Title    Light and D ark Adaptation of Crayfish Visual Cells Depending on Extracellular Calcium Concentration  
 Abstract    Lowering of extracellular Ca2+-concentration from 14 x 10-3 M to ca. 10~ 6 M (using 1 mM ethyleneglycol bis (/?-aminoethylether) -N,N'-tetraacetic acid (E G T A)) results in weaker light adap­ tation by a 2 s light exposure and faster dark adaptation (half time 45 + 1%) of crayfish visual cells. 
  Reference    (Z. Naturforsch. 31c, 324 [1976]; received February 2 1976) 
  Published    1976 
  Keywords    Calcium, Adaptation, Photoreceptor Cells, Crustacea 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0324.pdf 
 Identifier    ZNC-1976-31c-0324 
 Volume    31 
2Author    H.Requires cookie*
 Title    The Effect of Tetrodotoxin, Veratridine and Tetraethylammonium Chloride on the Receptor Potential o f the Crayfish Photoreceptor Cell  
 Abstract    S t i e v e a n d T . Ma l i n o w s k a In stitu t für Neurobiologie der K em forschungsanlage Jülich GmbH. The effect of three drugs on the receptor potential (ReP) o f the crayfish retina measured with external electrodes was tested. 1. Tetrodotoxin (TTX) (1 • 1CT6 g/ml and 1 • 10-5 g/ml) showed only slight effects on the receptor potential (Table I and II). 2. Veratridine (VERA) (1 • 10-5 g/ml) showed only small effects o f the same type as TT X but a little stronger on the receptor potential which became obvious especially in the period after washing out the drug (Table III). 3. Tetraethylammonium (TEA) (5 mWl) caused a decrease o f the height o f the receptor potential w ithout influencing the repolarizing phase (decrease-time tz) markedly (Table IV). The results can be interpreted as follows: 1. The permeability increase for sodium, calcium and magnesium, which causes the rising phase 
  Reference    (Z. Naturforsch. 28c, 149—156 [1973]; received December 12 1972) 
  Published    1973 
  Keywords    Receptor potential, tetrodotoxine, veratridine, TEA, photoreceptor cell, Crustacea 
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 TEI-XML for    default:Reihe_C/28/ZNC-1973-28c-0149.pdf 
 Identifier    ZNC-1973-28c-0149 
 Volume    28 
3Author    H. Stieve, T. MalinowskaRequires cookie*
 Title    The pH Dependence of the Receptor Potential of the Hermit Crab Photoreceptor  
 Abstract    The pH dependence of the receptor potential (ReP) of isolated layers of photoreceptor cells from the hermit crab compound eye (Eupagurus bernhardus L.) was determined. Measurements were performed, using extracellular electrodes, in the range pH 3.5 — 9.5 in three different buffer systems: Tris, glycine, and phosphate. The amplitude of the ReP was highest at pH 7.5 and decreased in more acidic and more alka­ line salines (Fig. 4). Relative to the changes in ReP amplitude, the changes in time course and shape of ReP were small. Salines of pH other than 7.5 caused an increase of the latent period but decreased the peak amplitude time and the repolarizing phase (i2). Alkaline salines caused about the same changes in the ReP as acidic salines. The only observed difference was that repolarisation was more strongly influenced by alkaline solutions and that the plateau magnitude was depressed relatively more than the peak magnitude in acidic environments. Of the three buffers used, Tris had the weakest influence on the ReP and phosphate buffer the strongest. In contrast to the good reproducibility of the experimental results, the reversibility of the pH effects was generally poor; the effects with glycine-buffer were more reversible than those with Tris. 
  Reference    (Z. Naturforsch. 29c, 147 [1974]; received December 19 1973) 
  Published    1974 
  Keywords    Receptor Potential, pH Dependence, Buffer Type, Photoreceptor Cell, Crustacea 
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 TEI-XML for    default:Reihe_C/29/ZNC-1974-29c-0147.pdf 
 Identifier    ZNC-1974-29c-0147 
 Volume    29