"1933-05-08Z"^^ . . . . . . "Mostafa El-Sayed"@en . . "Mostafa A. El-Sayed (Arabic: \u0645\u0635\u0637\u0641\u0649 \u0627\u0644\u0633\u064A\u062F) (born 8 May 1933) is an Egyptian-American chemical physicist, a leading nanoscience researcher, a member of the National Academy of Sciences and a US National Medal of Science laureate. He is also known for the spectroscopy rule named after him, the El-Sayed rule."@en . "1933Z"^^ . "El-Sayed, Mostafa"@en . . . . "Egyptian chemist" .