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 ?
Aside from 5-methylnaphthoquinone, not found in the sironids, the stylocellid secretion is strongly dominated by ketones and lacks the diversity of naphthoquinones found in sironids.
Keywords: henna, Lawsonia inermis, naphthoquinones, antibacterial, antiviral, antiparasitic
mansoni, the use of new formulations provides the prospect of studies aiming to increase activity and shed light on the action mechanism, and to use this drug as a prototype for the synthesis of new naphthoquinones derivatives with potential schistosomicidal properties.
Naphthoquinones are phytochemicals with a large pharmacological activity and have been widely used for industrial purposes (Silva et al.
2010, Synthesis and biological evaluation of substituted [alpha]-and [beta]-2,3-dihydrofuran naphthoquinones as potent antican-didal agents.
Rhinacanthin Q A naphthoquinone from Rhinacanthus nasutus and its biological activity.
From the mid-eighties, date when more formal and constant research on natural metabolites with leishmanicidal and antiprotozoal activity was initiated (Chan-Bacab and Pena-Rodriguez 2001), at nowadays, many natural products have been reported to show antiprotozoal activity, including naphthoquinones (Kayser et al.
Secondary metabolites belonging to different classes have already been reported for Bignoniaceae species, including naphthoquinones (Morais et al.
Some naphthoquinones were reported could induce apoptosis during activating caspases (Kang et al.