vitamin K

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vitamin K

[′vīd·ə·mən ¦kā]
(biochemistry)
Any of three yellowish oils which are fat-soluble, nonsteroid, and nonsaponifiable; it is essential for formation of prothrombin. Also known as antihemorrhagic vitamin; prothrombin factor.
References in periodicals archive ?
Genetic indications of menaquinones as electron carrier in ANME-1 and the various cellulosome and cell adhesion related gene domains in all ANME are also topics that could be explored further.
Sluijs et al., "A high menaquinone intake reduces the incidence of coronary heart disease," Nutrition, Metabolism and Cardiovascular Diseases, vol.
Phylloquinone (vitamin [K.sub.1]) is the major form of vitamin K in plants although there are a few different types of vitamin K (menaquinones) depending on the source.
Atsma et al., "High dietary menaquinone intake is associated with reduced coronary calcification," Atherosclerosis, vol.
Marbois, "Does menaquinone participate in brain astrocyte electron transport?" Medical Hypotheses, vol.
Quinone-reducing hydrogenase (7,55) and methanophenazine hydrogenase (7,56,57) have membrane-bound dihemic cytochrome b as the third subunit to interact with the electron carrier, menaquinone and methanophenazine, respectively.
Of the five dhb genes, DhbC is an isochorismate synthetase (ICS) and catalyzes the conversion of chorismate to isochorismate, which is an important siderophore or menaquinone precursor.
Vitamin K exists in two natural forms: vitamin K1, or phylloquinone, found largely in green leafy vegetables, as well as some vegetable oils, such as canola and soybean oils; and vitamin K2, or menaquinone, for which meat and cheese are the primary dietary sources.
This genus contains 10 environmental species that demonstrate similarities in 16S rDNA sequence and in phenotypic and chemotaxonomic data (menaquinone, fatty acids, hydroxy fatty acid, and polyamine) (2-5).
21 Menaquinone is a member of which group of vitamins?
Internal calibrators commonly used include menaquinone 6 (MK6), menaquinone 4 (vitamin [K.sub.2]), and vitamin [K.sub.1(25)], a structural analog of phylloquinone (19-21, 24,33).
9 Phylloquinone and menaquinone are forms of which vitamin necessary for blood clotting?