The System Calcium Oxide, Silica and Water

Ethics Report on Interspecies Somatic Cell Nuclear Transfer Research

“…One commentator has expressed the worry that successes in iSCNT research will lead to the widespread exploitation of egg donors pressured by researchers to provide human oocytes to fuel a subsequent increased interest in hSCNT studies (Baylis, 2008). We, along with several other bioethicists, do not believe this slippery-slope argument actually supports the conclusion that iSCNT research is unethical in its own right (Nelson, 2008;Savulescu and Skene, 2008).…”

The System CaO-SiO2-H2O and the Hydration of the Calcium Silicates.

“…Krasil'nikov and Kiselev (curve 7) made blank tests using only Ca(OH)2 solution in their reaction vessels, which were glass ampoules. After seven months the more concentrated solutions had diminished in CaO by 7 per cent, but no Si08 was found in solution. In the weaker solutions the loss of CaO was inappreciable.…”

“…ESTABLISH EQUILIBRIUM 1.... Baylis (7) 2-3 days Intermittent (one f-in. products precipitated from sodium metasilicate (and thoroughly washed before being suspended in Ca(OH)2 solutions).…”

“…This possibility, as it applies to curve 16, appears to be borne out in a subsequent report by Nacken (138), who (with Mosebach (137))4 established curve 16. Roller and Ervin have suggested that Beitlich may have obtained the high CaO/Si02 value that he did because of his use of solid lime, which may have become entangled in the gel. However, Baylis (7) and van der Burgh (28) also used solid lime, apparently with no ill effects.…”

The Removal of Silica from Water for Boiler Feed Purposes

“…(C) The removal of silica from water by precipitation of insoluble silicates is for the most part unsatisfactory due to the appreciable solubility of most silicates. Silica and the silicates of all the metals except the alkalies are considered insoluble, but an examination of data available indicates that ordinarily sufficient silica is left in solution to render the method unsatisfactory (8,9,26,37,44,50,51,65,66,102,106). However, by use of the principle of decreasing the solubility by adding an excess of precipitating reagent, it is possible to obtain results by precipitation of insoluble silicates (2,4,11,12,14,17,18,19,20,38,42,47,49,57,58,59,60,75,77,82,83,88,89,93,94,95).…”