Much of the damage caused by superoxide anion radical and hydrogen peroxide in vivo is thought to be due to their conversion into more reactive species, including hydroxyl radical, and probable ferryl iron species.

This paper gives an operation mechanism suitable for Chinese situation at present, including contract standard, the process of rendering data, group bidding, demand forecasting and distribution, approval of bidding data, bidding rules, the fulfillment of the contract, trading mode, clearing price and settlement, change of contract, breach of contract and its disposal.

Based upon the practical conditions of Chinese power systems, the concept of group bidding along with corresponding trading mechanism is proposed in this paper which ensures the equality of all power companies to a great extent.