A culture medium that is enriched to contains all of the growth requirements of a strain of organisms. The component of medium includes hormones growth factors and signaling substance that sustains proliferation and maintain normal cell metabolism. An example of medium is a newspaper from the combined media of newspapers,TV ,magazine ,radio and the internet.
Serum is a vitally important as a source of growth and adhesion factors ,harmones, lipidsand minerals for the culture of cells is basal media.It also regulates cell membrane permeability and serves as a carrier for lipids,enzymes,micronutrients,and trace planet into the cell
Both Medium and serum are chemically defined serum which are suitable for adherent cells with a protein free origin.