The largest diamond ever found in the U.S., a white gem named the Uncle Sam, was found here in 1924. It was 40.23 carats, which is basically the size of a gumball. And in the 1950s, a woman found a 15.33-carat diamond.
Alkaloids that possess an isoquinoline skeleton are among the most common of all alkaloids. These are derived from a 3,4-dihydroxytyramine (dopamine) precursor that undergoes a Schiff base addition with aldehydes of different origin.At least 4000 compounds of this structural type are known.hese alkaloids are mostly found in the Cactaceae, but in some other families as well. About 130 isoquinoline alkaloids are known. They are derived from a 3,4-dihydroxytyramine (dopamine) precursor and have an isoquinoline skeleton.
Nicotine is an alkaloid found in the nightshade family of plants (Solanaceae), predominantly in tobacco, and in lower quantities in tomato, potato, eggplant (aubergine), and green pepper. Nicotine alkaloids are also found in the leaves of the coca plant. Nicotine constitutes 0.3 to 5 percent of the tobacco plant by dry weight, with biosynthesis taking place in the roots, and accumulates in the leaves. It is a potent neurotoxin and is included in many insecticides.