Ib daim nyias nyias yog cov microporous membrane siv rau kev hloov thiab kuaj cov protein thiab nucleic acids. Nws feem ntau yog ib daim ntawv ntxeem tau ua los ntawm microporous membrane cov ntaub ntawv xws li nitrocellulose (NC), polyvinylidene fluoride (PVDF), los yog nylon 66. Nws yog ib qho tseem ceeb ntawm cov khoom siv -theem kev txhawb nqa hauv bioblotting technology tshwj xeeb yog siv rau kev sib cais thiab tshawb nrhiav cov biomolecules (xws li cov protein, nucleic acids, thiab hlwb). Los ntawm kev ua ntawm capillary, thaum hloov pauv tsis tau ntws los ntawm cov gel thiab nqa cov qauv mus rau hauv daim nyias nyias, cov protein los yog nucleic acid yog immobilized rau ntawm daim nyias nyias, tso cai rau kev tshawb nrhiav siv cov tshuaj tiv thaiv tshwj xeeb lossis cov tshuaj tiv thaiv.
Hloov daim nyias nyias (tseem hu ua blot membranes) feem ntau yog siv rau hauv cov tswv yim xws li Western blotting, Northern blotting, thiab Southern blotting los xyuas thiab txheeb xyuas cov proteins, RNA, thiab DNA. Lawv muaj feem xyuam rau thaj chaw xws li molecular biology, biochemistry, noob caj noob ces, thiab kev kuaj mob.