The electric resistance to d.c. of the yellow strips in the cuticle of worker hornets was measured in the dark under temperature changes within the optimal range of activity outside the nest (10-32°C). A distinct inverse correlation was observed between the resistance and the temperature, the former decreasing with rise of the latter. In all, each individual hornet measured was subjected to four successive cycles of measurement during which the specimens underwent warming followed by cooling. A slight unidirectional rise in the resistance both during warming and cooling was observed between two successive cycles. A typical thermal hysteresis loop formed between the warming and cooling lines, thus suggesting a memory effect.
- Semiconductive properties of cuticle
- memory effect in the cuticle
- thermal hysteresis