Grapefruit is oblate in shape, ranges in diameter from 3 to 5 inches and can weigh up to 150 g. Characteristically, it has thick, tough skin than that in the oranges. Inside, the fruit is segmented into arils as in other citrus fruits.
Nacre (/ËneÉªkÉr/ NAY-kÉr also /ËnÃ¦krÉ/ NAK-rÉ),[1] also known as mother of pearl, is an organic-inorganic composite material produced by some molluscs as an inner shell layer; it also makes up the outer coating of pearls. It is strong, resilient, and iridescent.
Schematic illustration of the structure of nacre showing the different components. Nacre appears to be made up of âbricksâ and these âbricksâ are made up of nanoscale asperities. Using incident laser light, researchers recently proved that an abalone shell surface has a reflection diffraction grating structure.