. "1927-04-29Z"^^ . "Ancker-Johnson, Betsy"@en . "Betsy Ancker-Johnson"@en . . "1927Z"^^ . . "American physicist" . "Betsy Ancker-Johnson (born April 29, 1927) is an American plasma physicist. She is known for her research into instabilities that can occur in plasmas in solids, and for her invention of a gigacycle range signal generator using semiconductor materials in magnetic and electric fields. She was the first female Presidential appointee in the U.S. Department of Commerce."@en . .