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Spectral sensitivity in insect calliphoro erythrocephala photoreceptors at a range of temperatures


, : Spectral sensitivity in insect calliphoro erythrocephala photoreceptors at a range of temperatures. Acta Physiologica Scandinavica Supplementum (537): 81-86

The function of the visual receptors of blowflies (Calliphora erythrocephala) was studied using intracellular recording techniques whereby the eye was kept at various temperatures below room temperature. Cooling reduced the response amplitude, decreased the time course and increased the latency. The Q10 [the change in the rate of a process when temperature is increased 10.degree. C] as calculated from different recordings and from various temperature steps was dependent both on the temperature range and the stimulation intensity, although more on the latter. From different kinds of spectral sensitivities of the receptor cells those with a double peak (UV and green) were studied with regard to the effect of the temperature change. A difference was found in the relative sensitivity change of the 2 peaks when the temperature was lowered. The sensitivity in UV remained enhanced in relation to green after cooling. The sensitizing pigment theory, according to which the double peaked spectral sensitivity is explained by assuming a photostable pigment transferring the energy to the photopigment, was supported. This support is valid if the UV sensitivity at room temperature is assumed to be higher, and is limited by the reduced energy transfer to the photopigment caused by the increased mobility of the sensitizing pigment.

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