Low rates of change enhance effect of humidity on the activity of insect hygroreceptors
Low rates of change enhance effect of humidity on the activity of insect hygroreceptors
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DOI：
10.1007/s00359-003-0397-z
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发表时间：
2003-03-01
影响因子：
2.1
通讯作者：
Tichy, H
中科院分区：
文献类型：
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作者：
Tichy, H
到目前为止，由于在刺激过程中无法测量湿度，我们无法理解潮湿细胞和干燥细胞在湿度梯度中对定向的贡献。这一问题在本研究中得到了解决，方法是使用一种紫外线吸收湿度计，使以100赫兹的频率监测湿度成为可能。在-1%相对湿度S(-1)和+1%相对湿度(-1)S(-1)的湿度范围内，蟑螂触角湿细胞和干细胞以低速率交替下降或上升。两种细胞的脉冲频率同时取决于瞬时湿度及其变化率。潮湿电池的高频率表明湿度很高。但在给定的湿度下，当湿度也升高时，响应频率更高。相反，干电池的高频信号湿度低，当湿度也在下降时，在给定湿度下频率更高。这些反应确保了蟑螂在干燥或水合的环境中停留的时间最短，从而可能保护它不会意外地从隐蔽的环境中出现在流动的空气中。在蟑螂的恒湿撤退中，波动甚至漂移的放电频率可以作为预警回归！
The inability to measure humidity during stimulation has so far prevented us from understanding the contribution of moist cells and dry cells to orientation in a gradient of humidity. The problem was solved in the present study by means of a UV-absorption hygrometer that made it possible to monitor humidity at a rate of 100 Hz. The antennal moist and dry cells of the cockroach were exposed to humidities alternatively falling or rising at low rates between -1% RH s(-1) and + 1% RH s(-1) (relative humidity). Impulse frequency of both types of cells depended simultaneously on instantaneous humidity and its rate of change. High frequencies of the moist cells signal high humidity. But at a given humidity, the response frequency is higher still when humidity is also rising. Conversely, high frequencies of the dry cell signal low humidity, and frequency is higher still at a given humidity when humidity is also falling. These responses ensure that the cockroach spent a minimum time in environments where desiccation or hydration occur and may thus protect the animal from emerging accidentally from under cover into moving air. In the constant-humidity retreat of the cockroach, fluctuating or even drifting discharge frequencies could serve as an early warning return!.