The oxidizing agent acts as an initiator for polymerization. The activation of initiator caspases requires binding to specific oligomeric activator protein. Butyl rubber polymerization is carried out as a continuous process with AlCl as the initiator. Figure 12 shows how the orbitals of an ethylene monomer interact with a radical initiator. Chemical initiation is due to chemical initiator. Other reactants required are oxygen from air and small amounts of a radical initiator. Effector caspases are then activated by these active initiator caspases through proteolytic cleavage. The shape or structure of the initiator influences polymer architecture. This is partly achieved by influencing the expression of the replication initiator RepC. Silicon, like boron, is a component of initiator and delay mixtures. Such reactions occur under free radical conditions using an initiator such as AIBN. This pathway is made up of a series of proteins called initiator and executioner caspases. Tellurium has been used in delay mixtures and in blasting cap initiator compositions. Each RPC message includes a random value from the initiator. All these control the binding of initiator proteins to the origin sequences.