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| | Virtanen, Artturi Ilmari |
 | | Knowing that the fermentation product, lactic acid, increases the acidity of the silage to a point at which destructive fermentation ceases, he developed a procedure (known by his initials, AIV) for adding dilute hydrochloric or sulfuric acid to newly stored silage, thereby increasing the acidity of the fodder beyond that point. |
 | | Virtanen was also a professor of biochemistry at the Helsinki University of Technology (1931-39) and director of Finland's Biochemical Research Institute, Helsinki, from 1931. |
 | | He did valuable research on the nitrogen-fixing bacteria in the root nodules of leguminous plants, on improved methods of butter preservation, and on economical, partially synthetic cattle feeds. |
| www.britannica.com /nobel/micro/624_86.html (221 words) |
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