Vitamin K. A lipid cofactor that is required for normal blood clotting. Several forms of vitamin K have been identified: VITAMIN K 1 (phytomenadione) derived from plants, VITAMIN K 2 (menaquinone) from bacteria, and synthetic naphthoquinone provitamins, VITAMIN K 3 (menadione). Vitamin K 3 provitamins, after being alkylated in vivo, exhibit the antifibrinolytic activity of vitamin K. Green leafy vegetables, liver, cheese, butter, and egg yolk are good sources of vitamin K. . 1.00
Vitamin K 1. Aquamephyton . Konakion . Phyllohydroquinone . Vitamin K1 . Phytonadione . Phylloquinone . Phytomenadione . A family of phylloquinones that contains a ring of 2-methyl-1,4-naphthoquinone and an isoprenoid side chain. Members of this group of vitamin K 1 have only one double bond on the proximal isoprene unit. Rich sources of vitamin K 1 include green plants, algae, and photosynthetic bacteria. Vitamin K1 has antihemorrhagic and prothrombogenic activity. . 0.87
Vitamin K 2. Menaquinones . Vitamin K Quinone . Vitamin K2 . Menaquinone . A group of substances similar to VITAMIN K 1 which contains a ring of 2-methyl-1,4-naphthoquinione and an isoprenoid side chain of varying number of isoprene units. In vitamin K 2, each isoprene unit contains a double bond. They are produced by bacteria including the normal intestinal flora. . 0.86
NAD(P)H Dehydrogenase (Quinone). Diaphorase, DT . Reductase, Menadione . Reductase, Phylloquinone . Reductase, Quinone . Reductase, Vitamin K . DT Diaphorase . Menadione Reductase . Phylloquinone Reductase . Quinone Reductase . Vitamin K Reductase . UBIQUINONE REDUCTASE . A flavoprotein that reversibly catalyzes the oxidation of NADH or NADPH by various quinones and oxidation-reduction dyes. The enzyme is inhibited by dicoumarol, capsaicin, and caffeine. . 0.78
Vitamin K Deficiency. Deficiency, Vitamin K . Deficiencies, Vitamin K . Vitamin K Deficiencies . A nutritional condition produced by a deficiency of VITAMIN K in the diet, characterized by an increased tendency to hemorrhage (HEMORRHAGIC DISORDERS). Such bleeding episodes may be particularly severe in newborn infants. (From Cecil Textbook of Medicine, 19th ed, p1182) . 0.77