Emerging evidence in a number of different epithelia suggests that changes in cytosolic calcium ion levels play a critical role in the regulation of transepithelial sodium transport. Maneuvers believed to raise cytosolic calcium ion activity lead to an inhibition of net sodium transport in toad urinary bladder, frog skin, and isolated perfused proximal renal tubules. Regulation of the level of ...

To evaluate the physiological responses of chrysanthemum to silicon spray in non-stress conditions, this study was performed in two separate experiments (at 4 to 5 and 8 to 12-leaf stages) as a factorial randomized completely design with two factors: silicon source (in two levels: sodium silicate and calcium silicate) and the concentration of silicate at five levels (0, 50, 100, 150 and 200 mg ...

In this study, we investigated the mechanism that links activation of N-methyl-D-aspartate (NMDA) receptors to inhibition of voltage-gated sodium channels in isolated catfish cone horizontal cells. NMDA channels were activated in voltage-clamped cells incubated in low-calcium saline or dialyzed with the calcium chelator BAPTA to determine that calcium influx through NMDA channels is required fo...

It is universally believed that the removal of external sodium ions is without effect on calcium current. We now report that in enzymatically isolated guinea pig ventricular cells, the replacement of external sodium ions with certain other cations causes a 3- to 6-fold increase in peak L-type calcium current. The increase in current is reversibly blocked by L-type calcium-channel antagonists, n...

The mechanism by which excessive sodium chloride intake raises blood pressure has not been fully clarified. The present study was therefore undertaken in patients with essential hypertension to investigate the possible role of an intracellular calcium-dependent mechanism in salt sensitivity. The difference in mean blood pressure between a week of low sodium chloride diet (3 g/day) and a week of...

Duck eggshells are one of bio-wastes from poultry industry and household that have been disposed. contain high calcium which can be applied as an alternative source daily for the body. Nanostructured duck eggshell used a food additive in beef sausage processing. This study was conducted to determine chemical quality fortified by nano-calcium. The materials include beef, soy protein isolate, pal...

We examined pathways which might result in the elevated resting free calcium [( Ca2+]i) levels observed in dystrophic mouse (mdx) skeletal muscle fibers and myotubes and human Duchenne muscular dystrophy myotubes. We found that mdx fibers, loaded with the calcium indicator fura-2, were less able to regulate [Ca2+]i levels in the region near the sarcolemma. Increased calcium influx or decreased ...

INTRODUCTION . . 101 PHYSIOLOGICAL BASIS FOR THE RELATIONSHIP BETWEEN URINARY SODIUM A N D CALCIUM . . 102 EFFECT O F SALT SUPPLEMENTATION O N CALCIUM METABOLISM I N T H E R A T . . . 102 RELATIONSHIP BETWEEN U R I N A R Y SODIUM A N D CALCIUM EXCRETION IN M A N . . . 104 STUDIES ON FREE-LIVING I N D I V I D U A L S . . 104 STUDIES WITH CONTROLLED SODIUM I N T A K E . . . 106 MAGNITUDE OF SODIU...