Light adaptation in Drosophila photoreceptors: II. Rising temperature increases the bandwidth of reliable signaling.
Light adaptation in Drosophila photoreceptors: II. Rising temperature increases the bandwidth of reliable signaling.
复制标题
果蝇光感受器的光适应性：ii。温度上升会增加可靠信号传导的带宽。
DOI：
10.1085/jgp.117.1.27
复制
发表时间：
2001-01
影响因子：
3.8
通讯作者：
Hardie, RC
中科院分区：
文献类型：
--
作者：
Juusola, M;Hardie, RC
已知平均光强度和温度的增加可以加速感光器信号，但不知道这些物理因素的同时增加是否会增强信息容量或导致编码错误。我们研究了适应光的果蝇光感受器在15至30°C的体内电压响应，发现温度的升高加速了光转导级联和感光膜动力学，拓宽了可靠信号的带宽，有效的Q10信息容量为6.5。电压响应的保真度和可靠性的增加是四个因素的结果：（1）基本响应的增加速率，即，量子凸点的产生;（2）早期光转导反应的温度依赖性加速，导致碰撞激光的更快和更窄的分散;（3）相对温度不敏感的光适应性碰撞波形;以及（4）光适应性感光器膜的时间常数的减小，其过滤与光转导噪声的动态特性相匹配。因为更快的神经处理允许更快的行为反应，果蝇光感受器的这种改善的性能表明，适当的高体温在视觉性能方面提供了显着的优势。
It is known that an increase in both the mean light intensity and temperature can speed up photoreceptor signals, but it is not known whether a simultaneous increase of these physical factors enhances information capacity or leads to coding errors. We studied the voltage responses of light-adapted Drosophila photoreceptors in vivo from 15 to 30°C, and found that an increase in temperature accelerated both the phototransduction cascade and photoreceptor membrane dynamics, broadening the bandwidth of reliable signaling with an effective Q10 for information capacity of 6.5. The increased fidelity and reliability of the voltage responses was a result of four factors: (1) an increased rate of elementary response, i.e., quantum bump production; (2) a temperature-dependent acceleration of the early phototransduction reactions causing a quicker and narrower dispersion of bump latencies; (3) a relatively temperature-insensitive light-adapted bump waveform; and (4) a decrease in the time constant of the light-adapted photoreceptor membrane, whose filtering matched the dynamic properties of the phototransduction noise. Because faster neural processing allows faster behavioral responses, this improved performance of Drosophila photoreceptors suggests that a suitably high body temperature offers significant advantages in visual performance.
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DOI：
10.1085/jgp.77.2.155
发表时间：
1981-02
期刊：
The Journal of general physiology
影响因子：
--
作者：
Lo MV;Pak WL
通讯作者：
Pak WL
影响因子：
5.5
作者：
LEUTSCHERHAZELHOFF, JT
通讯作者：
LEUTSCHERHAZELHOFF, JT
影响因子：
3.8
作者：
HOCHSTRATE, P;HAMDORF, K
通讯作者：
HAMDORF, K
影响因子：
5.5
作者：
FRENCH, AS;JARVILEHTO, M
通讯作者：
JARVILEHTO, M
影响因子：
64.8
作者：
AHO, AC;DONNER, K;REUTER, T
通讯作者：
REUTER, T