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A New Species Of The Brachiopod Notanoplia (Notanopliidae) From The Early Devonian Of New South Wales, Anthony J. Wright
A New Species Of The Brachiopod Notanoplia (Notanopliidae) From The Early Devonian Of New South Wales, Anthony J. Wright
Faculty of Science, Medicine and Health - Papers: part A
Notanoplia mitchelli sp. nov., a new notanopliid brachiopod, is described from Bowning, N.S.W., probably from the Lochkovian (Early Devonian) Elmside Formation. The distinctive genus is known only from Early and Middle Devonian rocks, and is known from Australia and Western Europe, and possibly from China.
Block Of Endplate Channels By Permeant Cations In Frog Skeletal Muscle, David J. Adams, W Nonner, T M. Dwyer, B Hille
Block Of Endplate Channels By Permeant Cations In Frog Skeletal Muscle, David J. Adams, W Nonner, T M. Dwyer, B Hille
Illawarra Health and Medical Research Institute
Motor endplates of frog semitendinosus muscles were studied under voltage clamp. Current fluctuations by iontophoretic application of acetylcholine were analyzed to give the elementary conductance, γ, and mean open time, τ, of endplate channels. Total replacement of the external Na+ ion by several other metal ions and by many permanent organic cations changed both γ and τ. Except with NH4 + ions, the γ values with foreign test ions were all smaller than expected from the independence relation and their previously measured permeability ratios. The more hydrophobic ions gave the smallest γ values. Foreign permeant cations also depress γ when …