The oysters are nucleated with a bead composed of mother-of-pearl and a small piece of mantle tissue. This bead becomes the nucleus of the pearl and is the reason akoya pearls are more often perfectly round.
Carbon definition, Chemistry. a widely distributed element that forms organic compounds in combination with hydrogen, oxygen, etc., and that occurs in a pure state as diamond and graphite, and in an impure state as charcoal.
Carbon dioxide (CO2) is a compound made of one carbon atom and two oxygen atoms. Beverages are artificially carbonated when carbon dioxide is dissolved into the liquid under high pressure. When that pressure is released, small gas bubbles develop. Carbonation can also occur naturally when carbon dioxide gas is dissolved into a liquid, such as in spring water, which absorbs CO2 underground.