THE EFFECT OF LIGHT AND DARKNESS ON THE PRODUCTION OF CERCARIAE OF SCHISTOSOMA-HAEMATOBIUM FROM BULINUS-GLOBOSUS
THE EFFECT OF LIGHT AND DARKNESS ON THE PRODUCTION OF CERCARIAE OF SCHISTOSOMA-HAEMATOBIUM FROM BULINUS-GLOBOSUS
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DOI：
10.1017/s0022149x00010191
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发表时间：
1987-12-01
影响因子：
1.6
通讯作者：
PROBERT, AJ
中科院分区：
文献类型：
--
作者：
RAYMOND, KM;PROBERT, AJ
日本血吸虫尾蚴在球泡螺体内的羽化具有昼夜周期性，昼夜周期为12小时。峰值发射发生在11：00小时，在黑暗期开始后的20：00小时出现较小的峰值。在连续照明中，没有看到第二个峰值，这表明只有早晨的峰值是昼夜节律的起源。夜间高峰是对黑暗处理的反应，可以由8秒至1小时的黑暗时间产生。黑暗处理的时间越长，恢复到光照条件时输出的上升维持的时间越长。蜗牛在正常光照期间进行黑暗处理，导致晚上高峰减少，最长时间的黑暗后，效果最大。在暴露于一系列光强度下15分钟后，观察到尾蚴的输出增加，最大的增加发生在10，000和7000勒克斯和完全黑暗下。这种对光照强度变化的快速反应表明，S.吸血鬼对阴影有反应
The cercariae of Schistosoma haematobium showed a diurnal periodicity of emergence from Bulinus globosus in a twelve hour light dark cycle. Peak emission occurred at 11:00 hrs with a smaller peak at 20:00 hrs, following the start of the period of darkness. In continuous illumination this second peak was not seen, indicating that only the morning peak is circadian in origin. The evening peak occurs in response to dark treatment and can be produced by periods of darkness ranging from eight seconds to one hour. The longer the period of dark treatment the longer the rise in output is maintained on return to light conditions. Subjection of snails to periods of dark treatment during the normal light period caused a reduction in the evening peak with the largest effect seen following the longest period of darkness. An increased output of cercariae was seen following fifteen minutes exposure to a range of light intensities, the largest increase occurring at 10,000 and 7000 lux and complete darkness. The rapidity of this reaction to variations in light intensity suggests that the cercariae of S. haematobium are showing emergence in response to shadows.