He turned his love of biology into lots of money. When Holger Zinke left university back in 1996 he founded his own biotechnical firm called BRAIN. Based in the town of Zwingenburg in Hessen. His comapny now boasts a multi-million turnover, selling its products to major corporations in the chemicals industry such as BASF and Henkel - for use, for instance, in washing liquids and cosmetics. A report by Grit Hofmann