the resultant radioautographs show diffusion gradients in the cytoplasm and nucleus , and concentration gradients across the nuclear envelope analysis of these gradients discloses that the nuclear envelope is as permeable as a comparable structure composed of cytoplasm , and is about 10 ( 8 ) times more permeable than the oocyte plasma membrane the diffusion coefficient of sucrose in cytoplasm is 2 x 10 ( -6 ) cm ( 2 ) /sec , or about one-third its diffusivity in pure water .
C0028584
nuclear envelope
C0010834
cytoplasm