in this research new adsorbents were prepared by modification of surfactant-coated g-alumina with three ligands; 1-(2-pyridylazo)-2-naphtol (pan), dithizone (hdz) and dimetyl golyoxime (dmg). the adsorbents were used for removal and pre-concentration of pb+2, cd+2, ni+2, cu+2, co+2. aqueous solutions of the metal ions were passed through a column filled with the adsorbent and the retained catio...

Activity of KCNQ (Kv7) channels requires binding of phosphatidylinositol 4,5-bisphosphate (PIP(2)) from the plasma membrane. We give evidence that Mg(2+) and polyamines weaken the KCNQ channel-phospholipid interaction. Lowering internal Mg(2+) augmented inward and outward KCNQ currents symmetrically, and raising Mg(2+) reduced currents symmetrically. Polyvalent organic cations added to the pipe...

The application range of superlubricity systems can be extended effectively by realizing an adjustable friction coefficient. In this study, a stable poly(vinylphosphonic acid) (PVPA) system was developed using sodium chloride (NaCl) solution as the lubricant. A sudden increase in coefficient occurred when trivalent salt introduced to base lubricant during process. changes surface microstructure...

We have investigated the interactions between extracellular divalent cations and the ATP-sensitive potassium channel in single guinea pig ventricular cells and found that, under whole-cell patch clamp recording conditions, extracellularly applied Co2+, Cd2+, and Zn2+ block current through the ATP-sensitive K channel (IKATP). The respective Kd's for block of IKATP by Cd2+ and Zn2+ are 28 and 0.4...

The impact of cell voltage on the capacitance practical electrochemical supercapacitors is a phenomenon observed experimentally, which lacks solid theoretical explanation. Herein, we provide combined experimental and molecular dynamics investigation relation between capacitance. We have studied this in supercapacitor cells comprising activated carbon material as active electrode material, neat ...

The vesicular nucleotide transporter (VNUT) is a secretory vesicle protein that is responsible for the vesicular storage and subsequent exocytosis of ATP (Sawada, K. et al., (2008) Proc. Natl. Acad. Sci. U.S.A. 105, 11720-11724). Since VNUT actively transports ATP in a membrane potential (Δψ)-dependent manner irrespective of divalent cations such as Mg or Ca, VNUT recognizes free ATP as a trans...