The effect of heating appears to be a partial dehydration ofthegypsum.
CH3, is produced by condensing phenacyl bromide with sodium acetoacetate with subsequent elimination of carbon dioxide, and on dehydration gives aa-phenyl-methyl-furfurane.
This may be derived from any iron compound naturally present in the stone, especially from limonite by dehydration on baking.
Energetic dehydration gives the olefine hydrocarbons, but under certain conditions ethers (see ETHER) are obtained.
He is determining the degree of dehydration incurred, the resulting pathological changes, and the replacement (hormonal and electrolyte) therapy necessary to rehabilitate the birds.
Oil can block the mucosal ion transport mechanism, resulting in dehydration and eventual death.
Holmes has revealed that small quantities of crude oil introduced into the gut of a saltwater-adapted bird can affect the mucosal transport and extra-renal excretory mechanisms, resulting in acute dehydration and eventual death.
Salted hides need very similar treatment to uncured hides, but the soaking is longer, because of the dehydration caused by salting.
Oxidation, dehydration and polymerization have all been suggested, but there is little direct evidence.
Whatever substance will secure this permanent dehydration of the hide fibres in a separate condition is called a "tanning material.
If, however, such leathers be stored for a time in a dry condition, the alumina becomes much more firmly fixed, owing probably to a further dehydration of the alumina gel deposited upon the fibres.
Defn: A white amorphous or crystalline substance, obtained by dehydration of mannite, and distinct from, but convertible into, mannitan.
Defn: An alkaloid, C8H13N, obtained by the chemicaldehydration of tropine, as an oily liquid having a coninelike odor.
Dehydration and shock were uniting to destroy her.
But the heptahydrate is not always formed by the dehydration of the dodecahydrate, and the behaviour on evaporation is therefore somewhat perplexing at first sight.
As dehydration proceeds, the heptahydrate can be formed, and the dodecahydrate will finally pass into the heptahydrate; and this, in turn, into the pentahydrate.
In the case of the dehydration of crystalline salts containing water of crystallization, we meet with phenomena which are in all respects similar to those just studied.
A very slight further dehydration will bring the solution into the state represented by b, at which the pentahydrate is formed, and the solution will at last disappear and leave this hydrate alone.
During dehydration these crystalline substances remain clear and transparent, and the pressure of the water vapour which they emit varies with the degree of hydration or the concentration of water in the mineral.
For more complete directions for dehydration see University of Illinois Circular 558, "Dehydrating Fruits and Vegetables at Home.
For the dehydration of green soybeans, it is generally agreed that a steam blanching of from 5 to 7 minutes before shelling is satisfactory.
Its previous removal by dehydration is therefore necessary.
The progress of the dehydration is indicated by the behavior of the solution, which as evaporation proceeds usually gelatinizes.
