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3 total sentences available.
Generally speaking it is found that the most carefully purified enzyme preparations give the reactions of proteins, and for a long time the view was prevalent that enzymes belonged to the class of nucleo-proteides (p. 421). It is certain, however, that many enzymes are known which are not nucleo-proteides, and some, such as the vegetable oxidases, seem to contain scarcely any nitrogen.
Source: wiktionary
Nitrogen can be a component of proteins, proteides and non-protein nitrogen. Protein consists of only polypeptides while proteides are composed of at least one protein and another compound which is a non-protein, e.g. phospho-proteides = protein + phosphoric acid.
Source: wiktionary
They are polypeptide, protein, or proteide-type compounds, containing only common amino acids, or in the proteide type such additional constituents as are otherwise present in natural proteins. The term “proteide” refers to the substances which contain (covalently or in any other way linked) other constituents such as lipoids, sugars, nucleic acid-type compounds, chromophores, etc.
Source: wiktionary
Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.