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In the jellyfish Aglantha digitale two forms of swimming arise from two separate propagating axonal impulses; a fast, overshooting action potential that depends on TTX-resistant Na+ channels, and a low amplitude spike that depends on T-type Ca2+ channels. While the Na+ action potential is propagated simply and without distortion, the shape of the Ca2+ spike depends on the past history of the axon; it is processed as well as propagated.
Patch- and voltage-clamp experiments show how three classes of K+ channels contribute to this apparently unique system. Dual Na+/Ca2+ impulses may increase the bandwidth of an axonal line of communication but it also places restrictions on the form of the synaptic input needed for spike initiation.
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Mechanisms of escape swimming in jellyfish - IES\R1\201021
14/12/20 → 13/12/22
Two swimming modes in Trachymedusae; bell kinematics and the role of giant axonsMeech, M. E., Mills, C. E., Haddock, S. H. D. & Meech, R. W., 15 May 2021, In: Journal of Experimental Biology. 224, 10, jeb239830.
Research output: Contribution to journal › Article (Academic Journal) › peer-reviewOpen AccessFile1 Citation (Scopus)29 Downloads (Pure)
Structure and function of the nervous system in nectophores of the siphonophore Nanomia bijuga.Meech, R. W. & Norekian, T., 9 Nov 2020, (Accepted/In press) In: Journal of Experimental Biology.
Research output: Contribution to journal › Article (Academic Journal) › peer-review
Electrophysiology and Behavior of Cnidarian Nervous SystemsMeech, R., 2019, Oxford Research Encyclopedia of Neuroscience . Oxford University Press, New York, p. 1-58 58 p.
Research output: Chapter in Book/Report/Conference proceeding › Chapter in a book