| Lloyd, John Uri | <person> U.S. Pharmacist, 1849-1936. Noted for investigational work in plant chemistry and phytochemistry as applied to medicines, alkaloids, and glucosides. (05 Mar 2000) |
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| Long, John | <person> U.S. Physician, 1856-1927. See: Long's coefficient, Long's formula. (05 Mar 2000) |
| Luft, John | <person> U.S. Histologist, *1927. See: Luft's potassium permanganate fixative. (05 Mar 2000) |