Attachment promoter Polyethyleneimines are used in the cell culture of weakly anchoring cells to increase attachment. PEI is a cationic polymer; the negatively charged outer surfaces of cells are attracted to dishes coated in PEI, facilitating stronger attachments between the cells and the plate. However, polyethylenimine expresses some toxicity if excess is left in solution. Transfection reagent Poly(ethylenimine) was the second polymeric transfection agent discovered, after poly-l-lysine. PEI condenses DNA into positively charged particles, which bind to anionic cell surface residues and are brought into the cell via endocytosis. Once inside the cell protonation of the amines results in an influx of counter-ions and a lowering of the osmotic potential. Osmotic swelling results and bursts the vesicle releasing the polymer-DNA complex (polyplex) into the cytoplasm. If the polyplex unpacks then the DNA is free to diffuse to the nucleus
· kallis · raskesti kvantifitseeritav · paljud antikehad parafiinlõikudel ei tööta 10. Rakukiibid new appliance to allow the screening of DNA molecules on droplets in cell chips. The aim is to cultivate series of eukaryote cells in drops, individually set on a support that will be engineered so as to carry out the screening of the DNA molecules and analyse the modifications of the transcriptome brought by the transfection. In the drops, the cell can adhere to the support or maintained in suspension kasutatakse rakkude "high-throughtput" testidena uurimaks geenifunktsioone pärast mõjutamist. Positsioonilised kiibid on tehnika kus kasutatakse võrdluseks kindlaid cDNA klastreid X,Y koordinaadistikus. cDNA kloneeritud vektoritesse ja seotud mikroskoobi slaidile, pärast transfektsiooni adhereeruvad rakud moodustavad korrapärase array, eeliseks natiivne vorm. 11. Valgukiibid
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