It is a member of the actinide and transuranium element series. Her work concentrates on transuranium elements and applications. Seaborg received the second one in 1951 for discoveries in the transuranium elements. Californium is one of the few transuranium elements that have practical applications. The transuranium elements americium and curium also remain in the aqueous phase. It was the first transuranium element produced synthetically. The Institute for Transuranium Elements (ITU) was a nuclear research institute in Karlsruhe, Germany. Transuranium elements may be utilized to synthesize other superheavy elements. All are transuranium elements and have atomic numbers of 95 and higher. Berkelium was the fifth transuranium element discovered after neptunium, plutonium, curium and americium.