biogenn.

1848 E. Desor Embryol. Nemertes (Boston Soc. Nat. Hist.) 3 It is nothing more nor less than the mother liquid, so to speak, which becomes transparent as the vitelline matter condenses, and which I propose to call biogen liquid, in consequence of its great importance in embryology.

1849 E. Desor in Amer. Jrnl. Sci. 7 397 This clear liquid surrounding the yolk is quite different from the albumen of the eggs of higher animals... I..propose to call it from its physiological significance, Biogen, or the biogen liquid.

1888 C. A. Stephens Living Matter v. 81 The stress upon biogen in the organism to differentiate for the production of the various kinds of tissue needed in the organic apparatus is, in adult life and old age, unduly potent.

1899 F. S. Lee tr. M. Verworn Gen. Physiol. vi. 481 In order to distinguish this body..from dead proteid and to indicate its high significance in the occurrence of vital phenomena, it appears fitting to replace the term ‘living proteid’ with that of biogen.

1909 Westm. Gaz. 23 Oct. 6/3 First, the biogene,..secondly, the cell, composed of a great number of biogenes.

1912 E. H. Starling Human Physiol. 21 Similar conceptions have been put forward by numerous other observers, each of whom has applied a different name to the elementary living particle, such as ‘pangene’, ‘plasome’, ‘biophor’, ‘biogen-molecule’, and many others.

2000 Endeavour 24 22/2 Later developments..envisaged protoplasm as a giant molecule (later called a ‘biogen’ by Max Verworn) with numerous side chains.