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.
alkyl group (ÄlËkÄ­l) [ key ], in chemistry, group of carbon and hydrogen atoms derived from an alkane molecule by removing one hydrogen atom (see radical). The name of the alkyl group is derived from the name of its alkane by replacing the-ane suffix with-yl, e.g., methyl, CH.The Columbia Electronic Encyclopedia, 6th ed. Copyright Â© 2012, Columbia University Press. All rights reserved.he name of the alkyl group is derived from the name of its alkane by replacing the-ane suffix with-yl, e.g., methyl, CH. The Columbia Electronic Encyclopedia, 6th ed. Copyright Â© 2012, Columbia University Press.