The synthesis of amino acid from methane, ammonia, H2 and water vapour in UV-radiation or electric discharge was experimentaly proved by Stanley Miller.
Sydney Fox : Developed 'microspheres'. These are small spheroidal biochemical aggregates with a covering membrane and are formed of organic compounds. This theory is known as protobiogenesis.
Oparin and Sydney Fox together discovered coacervates.
Oparin Haldane theory is known as abiogenic origin theory or biochemical origin of life.