The abiogenesis theory that the origins of all life on Earth were in nonliving chemical substances which spontaneously formed in Earth's early atmosphere and combined to make more complex chemicals until living cells were formed. Oparin's theory was developed by Alexander I. Oparin (1894-1980), a Russian biochemist.

From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.