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Proteid :: Proteid (n.) One of a class of amorphous nitrogenous principles, containing, as a rule, a small amount of sulphur; an albuminoid, as blood fibrin, casein of milk, etc. Proteids are present in nearly all animal fluids and make up the greater part of animal tissues and organs. They are also important constituents of vegetable tissues. See 2d Note under Food..

Albuminoid :: Albuminoid (n.) One of a class of organic principles (called also proteids) which form the main part of organized tissues.

Proteolytic :: Proteolytic (a.) Converting proteid or albuminous matter into soluble and diffusible products, as peptones..

Proteidea :: Proteidea (n. pl.) An order of aquatic amphibians having prominent external gills and four legs. It includes Proteus and Menobranchus (Necturus). Called also Proteoidea, and Proteida..

Vivification :: Vivification (n.) One of the changes of assimilation, in which proteid matter which has been transformed, and made a part of the tissue or tissue cells, is endowed with life, and thus enabled to manifest the phenomena of irritability, contractility, etc..

Casein :: Casein (n.) A proteid substance present in both the animal and the vegetable kingdom. In the animal kingdom it is chiefly found in milk, and constitutes the main part of the curd separated by rennet; in the vegetable kingdom it is found more or less abundantly in the seeds of leguminous plants. Its reactions resemble those of alkali albumin..

Xanthoprotein :: Xanthoprotein (n.) A yellow acid substance formed by the action of hot nitric acid on albuminous or proteid matter. It is changed to a deep orange-yellow color by the addition of ammonia.

Syphering :: Syntonin (n.) A proteid substance (acid albumin) formed from the albuminous matter of muscle by the action of dilute acids; -- formerly called musculin. See Acid albumin, under Albumin..

Hemiprotein :: Hemiprotein (n.) An insoluble, proteid substance, described by Schutzenberger, formed when albumin is heated for some time with dilute sulphuric acid. It is apparently identical with antialbumid and dyspeptone..

Sepsin :: Sepsin (n.) A soluble poison (ptomaine) present in putrid blood. It is also formed in the putrefaction of proteid matter in general.

Vitellin :: Vitellin (n.) An albuminous body, belonging to the class of globulins, obtained from yolk of egg, of which it is the chief proteid constituent, and from the seeds of many plants. From the latter it can be separated in crystalline form..

Globulin :: Globulin (n.) An albuminous body, insoluble in water, but soluble in dilute solutions of salt. It is present in the red blood corpuscles united with haematin to form haemoglobin. It is also found in the crystalline lens of the eye, and in blood serum, and is sometimes called crystallin. In the plural the word is applied to a group of proteid substances such as vitellin, myosin, fibrinogen, etc., all insoluble in water, but soluble in dilute salt solutions..

Plasmin :: Plasmin (n.) A proteid body, separated by some physiologists from blood plasma. It is probably identical with fibrinogen..

Paralbumin :: Paralbumin (n.) A proteidlike body found in the fluid from ovarian cysts and elsewhere. It is generally associated with a substance related to, if not identical with, glycogen..

Parapeptone :: Parapeptone (n.) An albuminous body formed in small quantity by the peptic digestion of proteids. It can be converted into peptone by pancreatic juice, but not by gastric juice..

Proteolysis :: Proteolysis (n.) The digestion or dissolving of proteid matter by proteolytic ferments.

Proteinaceous :: Proteinaceous (a.) Of or related to protein; albuminous; proteid.

Dyspeptone :: Dyspeptone (n.) An insoluble albuminous body formed from casein and other proteid substances by the action of gastric juice.

Neurine :: Neurine (n.) A poisonous organic base (a ptomaine) formed in the decomposition of protagon with boiling baryta water, and in the putrefraction of proteid matter. It was for a long time considered identical with choline, a crystalline body originally obtained from bile. Chemically, however, choline is oxyethyl-trimethyl-ammonium hydroxide, while neurine is vinyl-trimethyl-ammonium hydroxide..

Tyrosin :: Tyrosin (n.) A white crystalline nitrogenous substance present in small amount in the pancreas and spleen, and formed in large quantity from the decomposition of proteid matter by various means, -- as by pancreatic digestion, by putrefaction as of cheese, by the action of boiling acids, etc. Chemically, it consists of oxyphenol and amidopropionic acid, and by decomposition yields oxybenzoic acid, or some other benzol derivative..

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