. "David Walker"@en . "British botanist" . . "1928Z"^^ . . "2012-02-12Z"^^ . "Walker, David Alan"@en . "David Alan Walker"@en . . . "2012Z"^^ . "David Alan Walker FRS (18 August 1928 \u2013 12 February 2012) was a British scientist and Professor of Photosynthesis in the Department of Animal and Plant Sciences (APS) at the University of Sheffield. He authored over 200 scientific publications including several books during his lifetime."@en . "1928-08-18Z"^^ .