sentences:  Neighbouring Miersdorf was merged into the Zeuthen municipality in 1957.In World War II, the German Reichspostministerium research department under Wilhelm Ohnesorge had begun to build up a cyclotron particle accelerator and an isotope separator at Zeuthen, which from 1962 formed the nucleus of the East German Institute for High Energy Physics (IfH), part of the Academy of Sciences of the GDR.Following German reunification, the premises were merged as the second site of the DESY institute on 1 January 1992.