00254nam a22000977a 4500008004100000082001400041100002300055245002300078260004300101650001200144170619b        xxu||||| |||| 00| 0 eng d  a574/G315b  aGerking, Shelby D.  aBiological systems  aLondon:bW. B. Saunders company,c1969  aBiology