Summary
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1.
Retinula cells ofPeriplaneta in the same state of morphological adaptation differ among themselves in absolute sensitivity by up to 1 log unit (tenfold).
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2.
Morphologically dark-adapted retinula cells are, on average, ten times as sensitive as light-adapted cells to light on the optical axis.
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3.
All retinula cells are about 5 times as sensitive to plane polarized light in the plane of its optimum effectiveness as in the orthogonal plane.
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4.
Retinula cells fall into two groups with optimum plane of polarization 90 ° apart, corresponding with the 2 planes of rhabdomeric microvilli.
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Butler, R., Horridge, G.A. The electrophysiology of the retina ofPeriplaneta americana L.. J. Comp. Physiol. 83, 279–288 (1973). https://doi.org/10.1007/BF00693679
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DOI: https://doi.org/10.1007/BF00693679