The Reactions of Cerianthus to Light
نویسنده
چکیده
1. When Cerianthus membranaceus is illuminated upon one side, the animal turns its anterior portion toward the source of light. The number of degrees through which the animal turns is proportional to the logarithm of the intensity of the light. 2. A light intensity of between 250 m.c. and 15,000 m.c. is necessary to cause retraction of the animal. 3. The part of the spectrum which is most effective in causing heliotropic bending of Cerianthus lies between micromicro 510 and micromicro 570.
منابع مشابه
The Reactions of Cerianthus to Light by Mary
I t has long been known that direct sunlight (1) will cause Cerianthus membranaceus to withdraw its tentacles and body within the sheath which in nature lies beneath the sandy bottom of the sea. On the other hand, a relatively weak light causes prompt heliotropic turning toward the source of light. Since light increases the muscle tone of these animals it is apparent that light as strong as sun...
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عنوان ژورنال:
- The Journal of General Physiology
دوره 8 شماره
صفحات -
تاریخ انتشار 2003