The gradual irreversible changes in structure and function of an organism that occur as a result of the passage of time.
Senescence,Aging, Biological,Biological Aging
D046508
Culture Techniques
Methods of maintaining or growing biological materials in controlled laboratory conditions. These include the cultures of CELLS; TISSUES; organs; or embryo in vitro. Both animal and plant tissues may be cultured by a variety of methods. Cultures may derive from normal or abnormal tissues, and consist of a single cell type or mixed cell types.