The influence of light on the emergence of Schistosomatium Douthitti cercariae from their snail host.
The influence of light on the emergence of Schistosomatium Douthitti cercariae from their snail host.
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DOI：
10.2307/3273454
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发表时间：
1951-04
期刊：
影响因子：
--
通讯作者：
L. Olivier
中科院分区：
文献类型：
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作者：
L. Olivier
人们早就知道，在实验室条件下，杜氏血吸虫尾蚴通常在晚上从它们的蜗牛宿主中出来。假设在野外条件下也是如此。因此，在涉及该物种的感染实验中，研究人员必须在尾蚴出现12小时或更长时间后的晚上或早上进行实验。在夜间进行常规感染实验的不便，以及在尾虫出现12小时或更长时间后不宜使用尾虫，往往限制了该物种用于实验。当杜氏血吸虫被考虑用于实验室实验时，人们认识到，如果能在一天中更早地诱导尾蚴出现，该物种将更有用。对每日光周期的改变表明，这是最有可能实现这一点的方式。因此，设计了一个实验来测试是否可以通过改变光周期来改变发光周期。这项实验的结果在这里报告。
It has long been known that under laboratory conditions the cercariae of Schistosomatium douthitti (Cort) normally emerge from their snail host in the evening. It is assumed that this is also true under field conditions. In infection experiments involving this species, then, the investigator must either set up the experiments at night or during the morning following the emergence of the cercariae when they are 12 hours or more old. The inconvenience of doing routine infection experiments at night and the undesirability of using cercariae 12 hours or more after they have emerged tend to limit the use of this species for experimentation. When S. douthitti was being considered for use in laboratory experiments it was recognized that the species would be more useful if the cercariae could be induced to emerge earlier in the day. Modification of the daily light cycle suggested itself as the most likely way that this could be brought about. Accordingly, an experiment was designed to test whether the shedding cycle could be changed by alteration of the light cycle. The results of this experiment are reported here.