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首页> 外文期刊>Journal of Neurophysiology >Humidity-dependent cold cells on the antenna of the stick insect.
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Humidity-dependent cold cells on the antenna of the stick insect.

机译：粘虫昆虫触角上依赖湿度的冷细胞。

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摘要

We present the first systematic study of the response of insect "cold cells" to a variation in the partial pressure of water vapor in ambient air. The cold cells on the antenna of the stick insect respond with an increase in activity when either the temperature or the partial pressure of water vapor is suddenly reduced. This double dependency does not in itself constitute bimodality because it could disappear with the proper choice of parameters involving temperature and humidity. In this study, we demonstrate that the evaporation of a small amount of water from the sensillum surface resulting from a drop in the water vapor pressure-leading to a transient drop in temperature and thus to a brief rise in impulse frequency-is the most plausible explanation for this bimodal response. We also show with an order-of-magnitude calculation that this mechanism is plausible and consistent with the amounts of water vapor potentially present on the sensillum. We hypothesize that a film of moisture collects on the hygroscopic sensillum surface at higher humidity and then tends to evaporate when humidity is lowered. The water might even be bound loosely within the cuticular wall, a situation conceivable in a sensillum that contains two hygroreceptive cells in addition to the cold cell.
机译：我们提出了昆虫“冷细胞”对环境空气中水蒸气分压变化的响应的第一个系统研究。当水蒸气的温度或分压突然降低时，条虫昆虫天线上的冷细胞会以活动增加的方式作出反应。这种双重依赖性本身并不构成双峰性，因为如果适当选择涉及温度和湿度的参数，它可能会消失。在这项研究中，我们证明了由水蒸气压力下降导致的温度瞬变下降和脉冲频率的短暂升高导致的从蒸发器表面蒸发的少量水是最合理的此双峰响应的解释。我们还通过数量级计算表明，这种机制是合理的，并且与潜在存在于感官上的水蒸气量保持一致。我们假设在较高湿度下在吸湿性sensillum表面上会聚集一层水分，然后在降低湿度时趋于蒸发。水甚至可能被松散地束缚在表皮壁内，这是在感官室中可能出现的情况，感官室除了冷室外还包含两个吸湿性细胞。

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