Two-ion component electrostatic ion cyclotron (EIC) waves are studied in a single-ended Q-machine containing variable concentrations of Cs + and K + ions. Measurements of the excitation and propagation characteristics of the waves are presented and compared with available theories. The waves are internally excited by drawing an electron current along the magnetic field to an 11-mm exciter disk....

zinc is a substance that regulates neural excitability by binding whit sodium channel and potassium channel. the efficiency of free zinc ion, make down the neural survival rate, reduced the peak amplitude of na+ and make depolarization na channel, increased the peak amplitude of transition outward k+ currents and delayed rectifier. also it is an effective blocker of one subtype of tetrodoxine (...

Thermodynamic measurements of ion binding to the Streptomyces lividans K(+) channel were carried out using isothermal titration calorimetry, whereas atomic structures of ion-bound and ion-free conformations of the channel were characterized by x-ray crystallography. Here we use these assays to show that the ion radius dependence of selectivity stems from the channel's recognition of ion size (i...

Ion implantation is a surface modification technology to produce new material on the surface by impingement of high energy ions from the ion accelerator. In this work, AISI 304 stainless steels were coated with 90 nm Ni film by electron beam deposition and implanted by a flow of 5×1017 N cm−2 at 400 K temperature with different implantation energies of 10, 20, 30 and 40 keV. The prepared sample...

This work is focused on recombination processes in low temperature plasma down to 10 K. When reaching this low temperature in atomic gases, Collisional Radiative Recombination (CRR) where extra electron carries off energy, is dominant. A few accomplished CRR experiments do not follow theoretical predictions of very strong negative dependence. We propose to study transition from dissociative and...

The crystallographic structure of a potassium channel, Kv1.2, in an open state makes it feasible to simulate entire K(+) ion permeation events driven by a voltage bias and, thereby, elucidate the mechanism underlying ion conduction and selectivity of this type of channel. This Letter demonstrates that molecular dynamics simulations can provide movies of the overall conduction of K(+) ions throu...

Potassium channels selectively conduct K(+) ions across cellular membranes with extraordinary efficiency. Their selectivity filter exhibits four binding sites with approximately equal electron density in crystal structures with high K(+) concentrations, previously thought to reflect a superposition of alternating ion- and water-occupied states. Consequently, cotranslocation of ions with water h...

Kaon production from heavy-ion collisions is a topic of great interest. For heavy-ion collisions at =1 GeV/ nucleon, it has been shown that the kaon production probability is sensitive to the nuclear equation of state at high densities. ' At ultrarelativistic energy collisions available at the future heavy-ion collider, it has been argued that a kaon might carry the signature for the quark-gluo...