... is national 75 science items.Hollow-fiber membrane filter is a kind of semi-membrane which is ... ,may pass through the membrane, after collecting and become filter liquid, the high molecule goods (protein, nucleic acid ... is reached. YF type inner pressure type ultra-filter device is made of inner pressure hollow-fiber ... -4YF-5Model of membrane Hollow-fiber inner pressure-----I(A,B,C,D,E)The amount molecule ...