Effects of localized low-temperature pulses on the cockroach circadian pacemaker.
Effects of localized low-temperature pulses on the cockroach circadian pacemaker.
复制标题
局部低温脉冲对蟑螂昼夜节律起搏器的影响。
DOI：
10.1152/ajpregu.1981.240.3.r144
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发表时间：
1981
期刊：
影响因子：
--
通讯作者：
Page,TL
中科院分区：
文献类型：
--
作者：
Page,TL
利用局部低温脉冲研究了控制蟑螂（Leucophaea maderae）活动节律的昼夜节律起搏器由相互耦合的光叶振荡器组成的假设。在活动开始时，将一条视神经束冷却6小时（7.5 ℃）后，完整的视叶持续引起数小时的相位延迟。冷却神经孤立叶几乎没有效果。结果表明，低温相位通过在视叶中的振荡器中的相移来延迟节律。为了确定视叶振荡器是否耦合，对完整动物的一个视叶给予低温脉冲。如果在脉冲后4天通过视束切片分离治疗的叶，则节律（由未治疗的叶驱动）延迟;但如果在脉冲后0.5小时切断视束，则相移被阻止。在完整的动物中，视叶之间的相互作用也被发现可以减少低温脉冲引起的延迟。这些结果表明，蟑螂的昼夜节律起搏器是由两个相互耦合的光叶振荡器。
The hypothesis that the circadian pacemaker that controls the activity rhythm in the cockroach, Leucophaea maderae, is composed of mutually coupled optic lobe oscillators was investigated using localized low-temperature pulses. Following section of one optic tract cooling the intact optic lobe for 6 h (7.5 degrees C) beginning at activity onset consistently caused a phase delay of several hours. Cooling the neurally isolated lobe had little or no effect. The results suggested the low-temperature phase delays the rhythm via a phase shift in an oscillator in the optic lobe. To determine if optic lobe oscillators were coupled, low-temperature pulses were given to one optic lobe of intact animals. If the treated lobe was isolated by optic tract section 4 days after the pulse, the rhythm (driven by the untreated lobe) was delayed; but if the tract was cut 0.5 h after the pulse the phase shift was prevented. The interaction between the optic lobes in intact animals was also found to reduce the delay caused by a low-temperature pulse. These results suggest the cockroach circadian pacemaker is composed of two mutually coupled optic lobe oscillators.