a constant number of cells to obtain the highest transfection efficiency. This is easily achieved starting with a constant amount of DNA (for example, 1 g per 35 mm dish) and varying... 0.5 g/0.5 g, 1.0 g/1.0 g, 1.5 g/1.5 g and 2.0 g/2.0 g total amounts of DNA/liposome complex in the second experiment. Transfection Time: Transfection efficiency is related... to the exposure time of the cells to the DNA/liposome complex. In general, the longer the exposure time the higher the efficiency. However, since transfection is carried out in serum free...