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.
Glycoalkaloids are natural pesticides produced by nightshade plants. [They are also present in small amounts in a few non-nightshades: cherries, apples, and sugar beets.] Glycoalkaloids are bitter compounds which are found throughout the plant, but especially in leaves, flowers, and unripe fruits. They defend the plants against bacteria, fungi, viruses, and insects.