McNulty J A
J Pineal Res. 1984;1(2):139-47. doi: 10.1111/j.1600-079x.1984.tb00205.x.
The size of synaptic ribbons (SR) in photoreceptor cells of the goldfish pineal organ was quantified over 24-h light:dark cycles of long (16:8) and short (10:14) photoperiods during summer and winter months, respectively. The amplitude of both rhythms was similar with peak values occurring toward the latter part of the photophase or early dark. When fish were entrained to the long photoperiod and exposed to continual light, SR size continued to increase during the expected dark time. The effect of extending the photoperiod into the expected dark time was diminished when fish were entrained to a short photoperiod and presented with 6 h of darkness at the end of the 24-h period. The size increase in response to environmental lighting is believed to reflect a greater demand for either vesicle attachment sites or neurotransmitter storage sites since vesicles (neurotransmitter) have been hypothesized to accumulate in the synaptic pedicles during inhibition by light. From a comparative standpoint it is noteworthy that synaptic ribbons (vesicle-crowned rods) in mammals react in a similar manner to both normal and experimental lighting conditions.
分别在夏季和冬季，对金鱼松果体器官光感受器细胞中突触带（SR）的大小，在长（16:8）短（10:14）光周期的24小时光暗循环中进行了量化。两种节律的幅度相似，峰值出现在光期后期或黑暗初期。当鱼被训练适应长光周期并暴露于持续光照时，SR大小在预期的黑暗时间内持续增加。当鱼被训练适应短光周期并在24小时周期结束时给予6小时黑暗时，将光周期延长到预期黑暗时间的影响减弱。据信，对环境光照的大小增加反映了对囊泡附着位点或神经递质储存位点的更大需求，因为据推测，在光抑制期间囊泡（神经递质）会在突触小蒂中积累。从比较的角度来看，值得注意的是，哺乳动物中的突触带（囊泡冠杆）对正常和实验光照条件的反应方式相似。
