C S Donley

Publications (6)11.96 Total impact

• Article: Change of threshold after light-adaptation of the chromatic response of the frog's pineal organ (Stirnorgan).

  H Meissl, C S Donley
  Vision Research 02/1980; 20(5):379-83. · 2.41 Impact Factor
• Article: Characteristics of slow potentials from the frog epiphysis (Rana esculenta); possible mass photoreceptor potentials.

  C S Donley, H Meissl
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  ABSTRACT: In situ recorded responses (electropinealogram or EPG) are: (1) not color coded: (2) composed of a fast (lasting < 1sec) photopic component (λmax > 500 nm) and a slower (lasting 1 sec to 1 min) scotopic component (λmax ≈- 500 nm): (3) able to dark-adapt over at least 3.5 log units over a few half hours; (4) dominated by the scotopic (slow) component even at light levels where the spike activity is photopic; (5) show light integration according to Bloch's law up to ≈-5 sec in the dark-adapted state, up to ≈-500 msec in the light-adapted state; (6) also slow in light adapting requiring up to 30 min. The contention that they represent receptor potentials is based on: (a) the lack of a knee in the two-component dark-adaptation curve, (b) the dominance of a scotopic spectral sensitivity curve at photopic adaptation levels and (c) the limited number of cells and cell types in the organ.
  Vision Research 02/1979; 19(12):1343-9. · 2.41 Impact Factor
• Article: Sensitivity change of the chromatic response of the pineal organ of the frog, Rana esculenta, by light adaptation [proceedings].

  C S Donley, H Meissl
  The Journal of Physiology 12/1978; 284:115P. · 4.72 Impact Factor
• Article: Free amino acids and amines in the pineal organ of the rainbow trout (Salmo gairdneri): influence of light and dark.

  H Meissl, C S Donley, J H Wissler
  Comparative Biochemistry and Physiology Part C Comparative Pharmacology 02/1978; 61 C(2):401-5.
• Article: Color opponent slow potential interactions in the frontal organ of the frog: Rana pipiens.

  C S Donley
  Vision Research 03/1975; 15(2):245-51. · 2.41 Impact Factor
• Article: Free amino acids and amines in the pineal organ of the rainbow trout (Salmo gairdneri): Influence of light and dark

  H. Meissl, C.S. Donley, J.H. Wissler
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  ABSTRACT: 1. The relative content of free amino acids was measured in the pineal organ of the rainbow trout using a [14C]dansylation assay procedure and a two-dimensional microchromatography for separation.2. The main compounds of low molecular weight have been identified as taurine, glycine, alanine, arginine, histidine, glutamic acid and aspartic acid. γ-Aminobutyric acid and the indoleamine serotonin were present only in small quantities.3. Differences in the amino acid patterns between day and night in a daily photoperiod of 12:12 hr (light: dark) were only slight.4. Continuous light for 7 days significantly decreased the amount of taurine and increased ornithine, lysine, tryptophan, tyrosine and 5-hydroxyindole. Serotonin was not detectable under these conditions.
  Comparative Biochemistry and Physiology Part C: Comparative Pharmacology.