Behavioral and Electrophysiological Studies on Chemoreception in Aplysia
Behavioral and Electrophysiological Studies on Chemoreception in Aplysia
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海兔化学感受的行为和电生理学研究
DOI：
10.1093/icb/12.3.525
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发表时间：
1972
影响因子：
2.6
通讯作者：
B. Jahan
中科院分区：
文献类型：
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作者：
B. Jahan
以典型张口反应(MOR)作为趋化指标，在10−6 10−7M(谷氨酸)和10−5 10−6M(天冬氨酸)浓度较低的情况下，海兔天然食物中的几种氨基酸成分均能有效地诱导MOR。有人认为，这些物质可能是这种动物的食物引诱剂。行为学和电生理实验的综合结果表明，海兔最敏感的食物感受器主要位于口罩的前触须沟区域。这些受体似乎强烈地投射到大脑神经节的尾部暗细胞团。用不同化学物质刺激口腔面纱后的单个传入单位的细胞外记录显示，前触须沟区域的化学感受器对食物物质的敏感性是其他刺激的100~1000倍。有人认为，这些受体对食物引诱剂来说是相对“特异的”。单个化合物的行为阈值和电生理阈值数据之间存在相关性。电生理阈值是行为阈值的5-15倍。
Using the typical mouth opening response (MOR) as the index of chemore-ception, several amino acid constituents of natural food for Aplysia were effective in eliciting MOR in concentrations as low is 10−6 10−7 m (glutamic acid) and 10−5 10−6 m (aspartic acid). It was suggested that these substances may serve as food attractants for this animal. Combined results of behavioral and electrophysiological experiments indicated that the most sensitive food receptors of Aplysia are predominantly located in the anterior tentacular groove area of the oral veil. These receptors appeared to strongly project to the caudal dark cell clusters of the cerebral ganglion. Extracellular recording of single afferent units following oral veil stimulation with various chemicals showed that the chemoreceptors in the anterior tentacular groove area were 100 to 1000 times more sensitive to food substances than other stimuli tested. It was suggested that these receptors are relatively “specific” to food attractants. There was a correlation between behavioral and electrophysiological threshold data for the individual compounds. The electrophysiological thresholds however were 5–15 times higher than the behavioral thresholds.