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Effects of Ca2+ and SO4 2- ions on fluorite flotation

100%

Xun L. , Hu J. , Shi Q. , Zhang G.

Physicochemical Problems of Mineral Processing

2021

tom Vol. 57, iss. 2

95--104

The effects of Ca2+ and SO4 2- on the flotation behaviour of fluorite with sodium oleate as a collector and the underlying mechanism by which these effects were investigated via micro-flotation experiments, solution chemistry calculations, and X-ray photoelectron spectroscopy. The results indicated that the addition of SO4 2- and Ca2+ inhibited fluorite flotation and the inhibition effect was increased by the addition of pH. This was mainly due to the increase of the sulphate-containing components in the solution and the adsorption of SO4 2- on the surface of fluorite. With the increase of pH, the alkalinity of the solution increases, OH- and more SO4 2- are further adsorbed on the fluorite surface, thereby reducing the recovery of fluorite flotation.

Participation of phospholipase A2 isoforms in the control of calcium influx into electrically non-excitable cells

51%

Zablocki K. , Wasniewska M. , Duszynski J.

Acta Biochimica Polonica

2000

tom 47

nr 3

The participation of phospholipase A2 isoforms in capacitative store-operated Ca2+ influx into Jurkat leukemic T and MDCK cells was investigated. Preincubation of Jurkat cells with either bromophenacyl bromide (an inhibitor of secreted phospholipase A2, sPLA2) or Helss (an inhibitor of calcium independent phospholipase A2 iPLA2) resulted in a significant inhibition of the calcium influx. The extent of this inhibition depended on the pH of the extracellular millieu; it increased with alkalisation. The rate of Ca2+ influx into MDCK cells was reduced by bromophenacyl bromide. Preincubation of these cells with Helss resulted in the stimulation of the influx. These observations suggest the participation of different PLA2 isoforms in the regulation of Ca2+ influx. They also show that the extent that PLA2 isoforms control the influx depends on the pH of the medium. Finally, these data indicate that various phospholipase A2 isoforms may play a role in the control of Ca2+ influx in different cell lines.

Ionic macrocomponents of the interstitial waters of Puck Bay

44%

Bolalek J.

Oceanologia

1992

tom 33