An antenna device has a circular radiation plate with a diameter of substantially \xbd wavelength in electric length faced to a ground plate with a first power supply port and a second power supply port in its periphery. The liquid etchant includes a main component containing an oxo acid such as sulfuric acid and a peroxide such as hydrogen peroxide. Therefore, the therapeutic agent and method for treatment of the invention are useful for prevention and treatment of various disorder in brain and nerve. In the article, photochromic material is interposed between photochromic material and a source of activating radiation. A downstream preprocessing unit uses the information on the number of bit groups to be transmitted by a preprocessing unit connected upstream of it to determine a time for transmitting the data word of the downstream preprocessing unit. The quality of human blastocysts is enhanced in vitro by culturing with a prostacyclin agonist, Iloprost.