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A process by which reaction occurs in the presence of certain agents which were formerly believed to exert an influence by mere contact. It is now believed that such reactions are attended with the formation of an intermediate compound or compounds, so that by alternate composition and decomposition the agent is appare…

Synthesis of organic compounds by energy derived from chemical changes or reactions. Chemosynthesis of carbohydrates occurs in the nitrite bacteria through the oxidation of ammonia to nitrous acid, and in the nitrate bacteria through the conversion of nitrous into nitric acid. -- Chem`o*syn*thet"ic (#), a.…

d lividity, rapidly passing into a state of collapse, followed by death, or by a stage of reaction of fever. -- Cholera bacillus. See Comma bacillus. -- Cholera infantum, a dangerous summer disease, of infants, caused by hot weather, bad air, or poor milk, and especially fatal in large cities. -- Cholera morbus, a d…

hange into a curdlike or semisolid state, not by evaporation but by some kind of chemical reaction; to curdle; as, rennet coagulates milk; heat coagulates the white of an egg.

a thickened, curdlike, insoluble state, not by evaporation, but by some kind of chemical reaction; as, the spontaneous coagulation of freshly drawn blood; the coagulation of milk by rennet, or acid, and the coagulation of egg albumin by heat. Coagulation is generally the change of an albuminous body into an insoluble…

th light and heat. Combustion results is common cases from the mutual chemical action and reaction of the combustible and the oxygen of the atmosphere, whereby a new compound is formed. Ure. Supporter of combustion (Chem.), a gas as oxygen, the combination of which with a combustible, as coal, constitutes combustion.…

To subject to such reactions or processes that diazo compounds, or their derivatives, shall be produced by chemical exchange or substitution.

A similar oxide, having a slight alkaline reaction, as lime, magnesia, strontia, baryta.

Pertaining the reaction (contraction) of the muscles under electricity, or their sensibility to it.

Designating, or pert. to, a reaction which occurs with absorption of heat; formed by such a reaction; as, an endothermic substance; -- opposed to exothermic.

Characterized by, or formed with, evolution of heat; as, an exothermic reaction; -- opposed to endothermic.

An explosive agent; a compound or mixture susceptible of a rapid chemical reaction, as gunpowder, or nitro-glycerine.

and disease of malt. globular proteins, capable of catalyzing a wide variety of chemical reactions, not merely hydrolytic. The full set of enzymes causing production of ethyl alcohol from sugar has been identified and individually purified and studied. See enzyme

ency of a specific fungus or ferment (Mycoderma aceti). The process involves two distinct reactions, in which the oxygen of the air is essential. An intermediate product, aldehyde, is formed in the first process. 1. C2H6O + O = H2O + C2H4O

ach attended with fever. -- Gastric juice (Physiol.), a thin, watery fluid, with an acid reaction, secreted by a peculiar set of glands contained in the mucous membrane of the stomach. It consists mainly of dilute hydrochloric acid and the ferment pepsin. It is the most important digestive fluid in the body, but acts…

Incapable of being together without mutual reaction or decomposition, as certain medicines. Incompatible terms (Logic), terms which can not be combined in thought.

derived from lactic acid, and obtained as a white crystalline substance having a neutral reaction. It is metameric with alanine.

a sirupy, colorless fluid, soluble in water, with an intensely sour taste and strong acid reaction. There are at least three isomeric modifications all having the formula C3H6O3. Sarcolactic or paralactic acid occurs chiefly in dead muscle tissue, while ordinary lactic acid results from fermentation. The two acids are…

A white, crystalline substance, having a bitter taste and a neutral reaction, and forming one of the essential ingredients of lactucarium.

he impressed force, and takes place in the direction in which the force is impressed. (3) Reaction is always equal and opposite to action, that is to say, the actions of two bodies upon each other are always equal and in opposite directions. -- Marine law, or Maritime law, the law of the sea; a branch of the law merch…