Kunitaro Takahashi

The anomalous rectification and cation selectivity of the membrane of a starfish egg cell.

SummaryThe cation selectivity and its relation to the inward-going rectification of the immature egg cell membrane of a starfish,Nordora punctiformis, were studied and the following results were obtained. (1) When the external saline contains usual ion species the cell membrane at rest is predominantly permeable to K ions. The K chord conductancegk depends on the electrochemical potential of K ions, ΔV=V−EK′ and the external K concentration [K+]o by

Resting and spike potentials of skeletal muscle fibres of salt water elasmobranch and teleost fish

g_4 = A\left[ {1 + \exp \left( {\frac{{\Delta V - \Delta V_h }}{\upsilon }} \right)} \right]^{ - 1} ([K^ + ]_0 )^{\tfrac{1}{2}}

Induced neural‐type differentiation in the cleavage‐arrested blastomere isolated from early ascidian embryos.

(\Delta V_h \underset{\raise0.3em\hbox{

Electrical excitability in the egg cell membrane of the tunicate

\smash{\scriptscriptstyle\cdot}

Mechanism of anion permeation through the muscle fibre membrane of an elasmobranch fish, Taeniura lymma

}}{ \doteq } - 15mV,\upsilon \underset{\raise0.3em\hbox{

Differentiation of membrane excitability in isolated cleavage-arrested blastomeres from early ascidian embryos

\smash{\scriptscriptstyle\cdot}