Show simple item record

dc.contributor.advisor Glantz, Raymon M.
dc.creatorSon, Edward Mun-Song
dc.date.accessioned 2009-06-03T23:52:23Z
dc.date.available 2009-06-03T23:52:23Z
dc.date.issued 1992
dc.identifier.urihttps://hdl.handle.net/1911/13600
dc.description.abstract As previously shown in many other photoreceptors, during prolonged exposure to light, receptor sensitivity (mv/photon catch) declines and the speed of the response (rate of depolarization and rate of repolarization) increases. The functional significance of internal and external calcium in these changes were examined in the crayfish. We show that the response time characteristics depend significantly on the internal calcium level, whereas sensitivity appears to depend on the extracellular calcium. The effect of BAPTA, a calcium chelator, within the photoreceptor was to slow the response kinetics without changing sensitivity. We also examined the role of potassium channel blockers in accounting for BAPTA's effect. Although these blockers displayed similar effects to that of BAPTA, the data fail to provide irrefutable evidence that calcium works through the activation or the deactivation of K$\sp{+}$ conductances alone. Probably (even exclusively), internal calcium also affects the transduction process that precedes the channels openings.
dc.format.extent 35 p.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subjectNeurosciences
dc.title The role of calcium in light adaptation of the crayfish photoreceptor
dc.type.genre Thesis
dc.type.material Text
thesis.degree.department Biology
thesis.degree.discipline Natural Sciences
thesis.degree.grantor Rice University
thesis.degree.level Masters
thesis.degree.name Master of Science
dc.identifier.citation Son, Edward Mun-Song. "The role of calcium in light adaptation of the crayfish photoreceptor." (1992) Master’s Thesis, Rice University. https://hdl.handle.net/1911/13600.


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record