A method and apparatus for quenching metallurgical coke made in a coking oven. In particular, this invention relates to a conjugate which comprises a target recognition segment and an active cytotoxic segment. Experimental boxes 17a to 17h fixed to arms 16a to 16b rotate together with the rotary shaft 30. The predetermined duration is longer than a period from a time point when the electric current rises to a time point when the electric current reaches the maximum current. In combination these traits set Summers Kiss apart from all other existing varieties of Gaillardia known to the inventor.