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Responses of Cerianthus to stimulation (Coelenterata)

Horridge, George Adrian

Description

Cerianthus responds to a single condenser shock by a rapid contraction of tentacles and column. The response is symmetrical no matter where the shock is applied, from aboral end to tentacle tips, is propagated with a velocity of 1–2 m.sec., and is independent of the strength of the stimulus above threshold. The response is followed by an absolute refractory period of 60–70 m.sec. at 22–23° C. and a relative refractory period up to 200 m.sec. after the stimulus. For stimulation of either...[Show more]

dc.contributor.authorHorridge, George Adrian
dc.date.accessioned2019-09-16T02:19:29Z
dc.identifier.issn0028-0836
dc.identifier.urihttp://hdl.handle.net/1885/169668
dc.description.abstractCerianthus responds to a single condenser shock by a rapid contraction of tentacles and column. The response is symmetrical no matter where the shock is applied, from aboral end to tentacle tips, is propagated with a velocity of 1–2 m.sec., and is independent of the strength of the stimulus above threshold. The response is followed by an absolute refractory period of 60–70 m.sec. at 22–23° C. and a relative refractory period up to 200 m.sec. after the stimulus. For stimulation of either tentacles or column a threshold at twice the rheobase was obtained by discharge of a 0.05 µF. condenser through a total electrode-plus-preparation resistance of 3,000 ohms, thus giving a capacitance-resistance value of 0.15 m.sec. and chronaxie of 0.05 m.sec. Non-polarizable zinc–sulphate–zinc–agar glass tube electrodes of 0.5 mm. orifice diameter were used. With the same apparatus the chronaxie of the column through-conducting system of Naples specimens of Calliactis was 1.0 m.sec. Hill's1 equation for the excitation of nerve fits the strength-duration curve for Calliactis but does not approximate closely to that for Cerianthus. Complete curves of the strength-duration relation and the relative refractory period will be published elsewhere.
dc.format.extent2 pages
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherNature Research (part of Springer Nature)
dc.rights© Nature Publishing Group
dc.sourceNature
dc.subjectCerianthus
dc.subjectresponse
dc.subjectstimulus
dc.subjectstimulation
dc.subjectthreshold
dc.titleResponses of Cerianthus to stimulation (Coelenterata)
dc.typeJournal article
local.description.notesAt the time of publication the author was affiliated with the Gatty Marine Laboratory, St. Andrews.
local.identifier.citationvolume180
dc.date.issued1957-12-14
local.publisher.urlhttps://www.nature.com/
local.type.statusPublished Version
local.contributor.affiliationHorridge, George Adrian, Division of Biomedical Science and Biochemistry, CoS Research School of Biology, The Australian National University
local.description.embargo2037-12-31
local.identifier.essn1476-4687
local.bibliographicCitation.issue4598
local.bibliographicCitation.startpage1369
local.bibliographicCitation.lastpage1370
local.identifier.doi10.1038/1801369a0
CollectionsANU Research Publications

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