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 ?
The outcome of the study revealed that 2,3-bis(4-chlorophenylthio), 2- phenylthio-, 2-amino-, 2-amino-3-chloro-1,4- naphthoquinones showed a high level of activity against all three fungi [20, 21].
This lack of activity was most likely caused by the high cytotoxicity of naphthoquinones present in the extracts (Brandao et al.
In summary, we may observe that while the composition of the secretions of the three species is similar in constituting mixtures of ketones and naphthoquinones, there are significant differences both qualitative and quantitative.
Structures of naphthoquinones produced by the fungus, Fusarium sp, and their biological-activity toward pollen germination.
Chemically, phenols and benzoquinones predominate within laniatorid secretions, while acyclic components and, at least in Phalangium opilio Linnaeus 1758, also naphthoquinones (Wiemer et al.
Naphthoquinones are compounds present in various families of plants; their molecular structures endow them with redox properties which confer activity in various biological oxidative processes.
Benzoquinone inhibits the voltage-dependent induction of the mitochondrial permeability transition caused by redox-cycling naphthoquinones.
The anti-leukaemic activity of novel synthetic naphthoquinones against acute myeloid leukaemia: induction of cell death via the triggering of multiple signalling pathways," British Journal of Haematology, vol.
Several compounds isolated from plants, such as terpenoids, sterols, flavonoids, alkaloids, phenolics and naphthoquinones have been studied to evaluate their effects on Leishmania spp.