cium was omitted from the medium, and markedly inhibited by the addition of cocaine. 3. Addition of reserpine or tyramine stimulated the release of catecholamine from the slices. The effect of reserpine was diminished in calcium free medium, but that of tyramine was not affected in calcium free medium. Cocaine had a weak inhibitory effect on the release of catecholamine caused by reserpine but ...

Abstract Multivalent-ion batteries such as calcium-ion show promise a high-density alternative to lithium-ion which currently dominate the portable electronics market. In this work, adsorption and diffusion properties of calcium ion at van der Waals (vdW) interface 2D heterostructure formed by vertically stacking NbSe 2 monolayer graphene were investigated via density functional theory (DFT) ca...

It is proposed that the basic mechanism of vasospasm which sometimes follows subarachnoid hemorrhage is dependent on increased free intracellular calcium ion produced by spasmogens from closely applied extravasated blood. Relaxation of this spasm occurs when the intracellular cyclic AMP levels are raised, resulting in sequestration of calcium ion by the vascular smooth muscle cell sarcoplasmic ...

Calcium ions play many important roles in biological systems. For example, calcium ion activity can be used as an indicator of second-messenger signal-transduction processes in cells. Intracellular stores of calcium are housed in the mitochondria, the endoplasmic reticulum and other membrane structures, and in calmodulin molecules, and are released upon triggering by signaling events that alter...

To investigate dental erosion in employees working with sulfuric acid at a lead storage battery manufacturing plant and level of personal exposure to sulfuric ions, we measured sulfuric ion concentrations in the mouth rinse of those employees. We also measured exposure levels from air samples obtained from 2 employees from the same plant who did not work with sulfuric acid using a portable air ...

Inherent smooth muscle tone and acetylcholine-induced contractions of the isolated longitudinal muscle from guinea pig ileum are inhibited by 1.2 M ethanol. The inhibitions are antagonized by high concentrations of calcium ion in the external medium. Previous work has indicated that an acetylcholine-induced increase in potassium efflux from the ileal muscle is also inhibited by ethanol and reac...

Inherent smooth muscle tone and acetylcholine-induced contractions of the isolated longitudinal muscle from guinea pig ileum are inhibited by 1.2 M ethanol. The inhibitions are antagonized by high concentrations of calcium ion in the external medium. Previous work has indicated that an acetylcholine-induced increase in potassium efflux from the ileal muscle is also inhibited by ethanol and reac...

PEARSON, TERRY W., AND ANDREW M. GOLDNER. Calcium transport across avian uterus. I. E$Ects of electro&e substitution. Am. J. Physiol. 225(6) : 1508-l 5 12. 1973.-Unidirectional calcium fluxes from serosa to mucosa (JS,, ) and mucosa to serosa (Jmds ) were determined across the isolated quail uterus. When the tissue was bathed with normal bicarbonate buffer, the spontaneous electrical potential ...

Concrete specimens were exposed to weekly cycles of wetting and drying in distilled water and in solutions of sodium chloride, calcium chloride, magnesium chloride, and calcium magnesium acetate with either a 6.04 molal ion concentration, equivalent in ion concentration to a 15% solution of NaCl, or a 1.06 molal ion concentration, equivalent in ion concentration to a 3% solution of NaCl, for pe...