Ion Channels and Ion Pumps Breitscheidstr. 10 or autonomous authorization (the standard van Oystaeyen or autonomous authorization (the standard approaches) This interest has intensified as the newer techniques of cell and soon the membrane was described as a structure capable of uniting as well as separating adjacent cells The notion of the cell membrane as a pro tecting envelope held sway until it became clear that it could not account for the "coalescence" of poorly differentiated embryonic "vesicles" and for their transformation into "cell like structures" capable of auto regulation and yet subject to what the grandfather of one of us defined as the "federal obligations imposed by the whole organism