BioConcepts

unit-membraneEinheitsmembran (ger.)

• Any lipoprotein membrane composed of two electron-dense layers enclosing a less dense layer, found enclosing many cells and cell organelles. (OED 2011)
  category cell

  1959

  Perhaps the gap substance or the character of the unit membrane surface here is different.

  Robertson, J.D. (1959). The ultrastructure of cell membranes and their derivatives. In: Crook, E.M. (ed.). The Structure and Function of Subcellular Components (= Biochem. Soc. Symp. 16), 3-43: 32-3.