Herein it is reported that chitosan, a natural filmogenic biopolymer, can undergo soft-templating in liquid phase under hydrothermal conditions by two typical structure directing agents, namely hexamethyleneimine (HMI) and tetraethylammonium (TEA) employed the synthesis of zeolites MCM-22 Beta, respectively. After templation, pyrolysis chitosan inert atmosphere renders 3D graphitic sponges with...

The block by the symmetric tetraethylammonium (TEA) ion derivatives tetrapropylammonium (TPrA), tetrabutylammonium (TBA), and tetrapentylammonium (TPeA) ions of fast chloride channels in acutely dissociated rat cortical neurons was studied with the excised inside-out configuration of the patch-clamp technique. When applied to the intracellular membrane surface, all three of the quaternary ammon...

The effects of tetraethylammonium (TEA) on the delayed K+ current and on the Ca2+-activated K+ current of the Aplysia pacemaker neurons R-15 and L-6 were studied. The delayed outward K+ current was measured in Ca2+-free ASW containing tetrodotoxin (TTX), using brief depolarizing clamp pulses. External TEA blocks the delayed K+ current reversibly in a dose-dependent manner. The experimental resu...

M UCH has been written in regard to the treatment of phantom leg symptoms. It is readily conceded that there is no comprehensible explanation for the phantom illusion, yet this does not exclude the fact that there is such a symptom complex. After amputation of an extremity it is usual for the patient to have sensations which seem to orignate in the absent limb. In the majority of cases these se...

The classical potassium-selective ion channel blocker tetraethylammonium ion (TEA) was shown to block chloride-selective ion channels from excised surface membranes of acutely dissociated rat cortical neurons when applied to the formerly intracellular membrane surface. The patch voltage clamp method was used to record single channel currents from fast Cl channels in the presence of TEAi. At the...