(1834â1908), Dutch ophthalmologist. Snellen was director of an eye clinic at Utrecht. In 1862 he introduced a test for measuring the acuteness of vision which consisted of printed letters or words in type of various sizes.
Brief Summary. Papaver somniferum, opium poppy, is an annual herbaceous plant in the Papaveraceae (poppy family) that originated in southeastern Europe and western Asia, and are now widely cultivated in Europe, Asia, China, and North Africa for their seeds, which are used in baking, as a condiment, and for their edible oil.
CULTIVATION Commercial trial crops of opium poppies were first grown in England in 2002. Alkaloids are natural organic nitrogen-containing bases found mainly in plants. Morphine, a bitter white crystalline compound, is the principal alkaloid in the opium poppy Papaver somniferum. Traces of the compound, possibly from dietary sources, also occur in animal tissues and fluids, including human heart tissue and urine.