Princeton's WordNet(0.00 / 0 votes)Rate this definition: Freebase(0.00 / 0 votes)Rate this definition: The Namib is a coastal desert in southern Africa. The name Namib is of Nama origin and means vast place. According to the broadest definition, the Namib stretches for more than 2,000 kilometres along the Atlantic coasts of Angola, Namibia, and South Africa, extending southward from the Carunjamba River in Angola, through Namibia and to the Olifants River in Western Cape, South Africa. The Namib's northernmost portion, which extends 450 kilometres from the Angola-Namibia border, is known as MoÃ§Ã¢medes Desert, while its southern portion approaches the neighboring Kalahari Desert.
Vitamin A is needed by the retina of the eye in the form of retinal, which combines with protein opsin to form rhodopsin, the light-absorbing molecule necessary for both low-light (scotopic vision) and color vision. Retinol, the form of vitamin A absorbed when eating animal food sources, is a yellow, fat-soluble substance. 2  Since the pure alcohol form is unstable, the vitamin is found in tissues in a form of retinyl ester. 3  It is also commercially produced and administered as esters such as retinyl acetate or palmitate.
Vitamin A is a group of compounds that includes retinoids and carotenoids. Vitamin A from plant sources is a carotenoid that your body can transform into a retinol, while vitamin A from animal sources is already in a form of retinol that's easily absorbed by your body.Vitamin A palmitate is the form of vitamin A found naturally in animal sources and also produced synthetically.itamin A is a group of compounds that includes retinoids and carotenoids. Vitamin A from plant sources is a carotenoid that your body can transform into a retinol, while vitamin A from animal sources is already in a form of retinol that's easily absorbed by your body.