a crystalline, water-soluble vitamin, C 10 H 16 O 3 N 2 S, of the vitamin B complex, that is present in all living cells and functions as a growth factor and as a catalyst in carboxylation reactions.
a vitamin of the B complex, abundant in egg yolk and liver, deficiency of which causes dermatitis and loss of hair. Formula: C10H16N2O3S See also avidin
A water-soluble organic acid belonging to the vitamin B complex that is important in the metabolism of carbohydrates and fatty acids. It is also a cofactor for some coenzymes that catalyze the synthesis of organic acids in the body. Biotin is found in liver, egg yolks, milk, yeast, and some vegetables. Chemical formula: C10H16N2O3S.
a very common mineral of the mica group, occurring in black, dark-brown, or dark-green sheets and flakes: an important constituent of igneous and metamorphic rocks. Historical Examples South! Sir Ernest Shackleton The Long Labrador Trail Dillon Wallace Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 6 Various The Long Labrador Trail Dillon Wallace Encyclopaedia Britannica, 11th […]
a portion of a habitat characterized by uniformity in climate and distribution of biotic and abiotic components, as a tidal pool or a forest canopy. noun (ecology) a small area, such as the bark of a tree, that supports its own distinctive community biotope (bī’ə-tōp’) A usually small or well-defined area that is uniform in […]