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Fig. 9. (A) Ratio between the sensitivity for 500 nm and 359 nm light determined
from intracellular, electrophysiological recordings of a Musca
photoreceptor adapted to orange light, the intensity of which is indicated in
decadic log units (abscissa; from Vogt et
al., 1982). The peak and plateau potential (dotted line, 30 s
light adaptation; continuous line, 150 s adaptation) indicate the sensitivity
range of the photoreceptor. (B) Pupil absorbance as a function of log
adaptation intensity derived from the sensitivity ratio of A together with the
relationship between the average sensitivity ratio and the pupil absorbance
for photoreceptors with one sensitizing pigment molecule per rhodopsin
(Fig. 10, av).
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