Abstract:
Cell Model NAOAKI ONO* AND TAKASHI IKEGAMI2 (Received on 2 February 1999; Accepted in revised form on 2 June 2000) Living cells must maintain their membranes by active metabolism. The membrane is not static but a dynamic structure that has evolved along with its internal reactions. When we re#ect on the emergence and evolution of primitive cells, we should not forget the mutual dependency between membranes and metabolic cycles inside the cell. In this paper, we present a simple abstract model of the self-maintaining cell. A metabolic cycle will produce a self-assembling membrane that will enclose the metabolic cycle. We show that a self-maintaining cell has the potential to reproduce itself spontaneously. Further, we have demonstrated two di!erent ways of cellular reproduction depending on the mobility of chemicals. In the "rst case, a cell releases autocatalytic chemicals that create new cells outside the mother cell. In the second case, a cell grows larger and divides its...
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