Nrog rau kev txhim kho ntawm cov thev naus laus zis membrane, cov thev naus laus zis membrane tau siv dav hauv kev sib cais, kev ntxuav thiab kev sib sau ua ke ntawm cov kua dej hauv kev lag luam.
Cov txheej txheem membrane sib xyaw ua ke siv tau los cais thiab rho tawm cov khoom me me hauv cov tshuaj sai dua thiab yooj yim dua, tshwj xeeb tshaj yog hauv kev sib cais, kev ntxuav thiab kev sib sau ua ke ntawm cov khoom me me hauv cov txheej txheem nyuaj. Piv nrog rau cov txheej txheem ib txwm muaj, nws muaj qhov zoo ntawm kev ua haujlwm sai dua, mos dua, siv zog tsawg dua thiab ua haujlwm yooj yim dua. Piv txwv li, muaj cov xwm txheej laus hauv kev sib cais thiab rho tawm cov khoom me me thiab nruab nrab hauv cov txheej txheem nyuaj xws li fermentation broth system, cog extract system, cov khoom me me ntuj tsim, thiab txawm tias qee qhov ntawm lawv tau dhau los ua cov txheej txheem dav dav hauv kev tsim khoom uas twb muaj lawm thiab tau txais dav dav.