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.
Total Organic Carbon (TOC) is a direct measure of organic compound in samples. samples can be broken down into two types: organic and inorganic carbon. in the sample is composed of carbonates, bicarbonates, and carbon dioxide. measurements these forms of carbon are not necessary to include in the measurement.