These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Membrane currents in a calcium type muscle membrane under voltage clamp.
    Author: Hencek M, Zachar J, Zacharová D.
    Journal: Physiol Bohemoslov; 1978; 27(5):457-66. PubMed ID: 153539.
    Abstract:
    Four ionic current components were identified in the total membrane current recorded under voltage clamp conditions from the muscle membrane of the crayfish (Astacus fluviatilis). The early inward current component is dependent on the presence of Ca2+ ions, disappears in Ca2+ free solutions and is insensitive to variaton of external Na+ ions and to tetrodotoxin. The outward current consists of at least three components, an early, a late and a slow outward current. The outward currents are sensitive to TEA and their reversal potentials differ. The early potassium current may be separated in a proportion of fibres by a hump from the later potassium current. An insufficient space clamp as a cause of the hump was excluded by comparing the size of the clamped membrane area with the distribution of large membrane clefts in the fibre. The early outward current is critically dependent on the presence of Ca2+ ions and is relatively more sensitive to TEA ions and to conditioning depolarisation than the late outward current.
    [Abstract] [Full Text] [Related] [New Search]