Naphthoquinones. Naphthalenediones . Naphthazarins . Naphthalene rings which contain two ketone moieties in any position. They can be substituted in any position except at the ketone groups. . 0.38
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. . 0.36
Radon. Actinon . Thoron (Element) . A naturally radioactive element with atomic symbol Rn, and atomic number 86. It is a member of the noble gas family found in soil, and is released during the decay of RADIUM. . 0.32
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. . 0.30