Carotenoids. Carotenoids are very long-chain water-repelling pigments that are synthesized in the plastids of plant cells. In the sunflower, a common carotenoid, ss-Ã, carotene is produced in the chromoplasts of the ray flowers to produce bright-yellow orange. colorsarotenoids. Carotenoids are very long-chain water-repelling pigments that are synthesized in the plastids of plant cells. In the sunflower, a common carotenoid, ss-Ã, carotene is produced in the chromoplasts of the ray flowers to produce bright-yellow orange. colors
Bette Nesmith Graham. Liquid Paper Inventor. As electric typewriters came into widespread use after World War II, Bette Nesmith Graham and countless other secretaries let out a collective groan. The new machines did make typing easier, but their carbon-film ribbons made it impossible to correct mistakes neatly with a pencil eraser.
Cai Lun, courtesy name Jingzhong, was a Chinese eunuch, inventor, and politician of the Han dynasty. He is traditionally regarded as the inventor of paper and the papermaking process, in forms recognizable in modern times as paper. Although early forms of paper had existed in China since the 2nd century BCE, he was responsible for the first significant improvement and standardization of papermaking by adding essential new materials into its composition.