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  2. Menadione - Wikipedia

    en.wikipedia.org/wiki/Menadione

    Menadione is converted to vitamin K 2 (specifically, MK-4) by the prenyltransferase action of vertebrate UBIAD1. [4] This reaction requires the hydroquinone (reduced) form of K 3, menadiol, produced by NQO1. [6] Menadione is also a circulating form of vitamin K, produced in small amounts (1–5%) after intestinal absorption of K 1 and K 2.

  3. Vitamin K - Wikipedia

    en.wikipedia.org/wiki/Vitamin_K

    Many bacteria, including Escherichia coli found in the large intestine, can synthesize vitamin K 2 (MK-7 up to MK-11), [69] but not vitamin K 1. In the vitamin K 2 synthesizing bacteria, menaquinone transfers two electrons between two different small molecules, during oxygen-independent metabolic energy production processes (anaerobic ...

  4. Vitamin K2 - Wikipedia

    en.wikipedia.org/wiki/Vitamin_K2

    Vitamin K 2 or menaquinone (MK) (/ ˌ m ɛ n ə ˈ k w ɪ n oʊ n /) is one of three types of vitamin K, the other two being vitamin K 1 (phylloquinone) and K 3 . K 2 is both a tissue and bacterial product (derived from vitamin K 1 in both cases) and is usually found in animal products or fermented foods .

  5. Menatetrenone - Wikipedia

    en.wikipedia.org/wiki/Menatetrenone

    MK-4 is the major form of Vitamin K in vertebrate animals, including humans and common forms of meat animals. It is produced via conversion of vitamin K 1 in the body, specifically in the testes, pancreas and arterial walls. [2] The conversion is not dependent on gut bacteria, occurring in germ-free rats [3] [4] and in parenterally-administered ...

  6. Gut microbiota - Wikipedia

    en.wikipedia.org/wiki/Gut_microbiota

    Gut microbiota, gut microbiome, or gut flora are the microorganisms, including bacteria, archaea, fungi, and viruses, that live in the digestive tracts of animals. [ 1 ] [ 2 ] The gastrointestinal metagenome is the aggregate of all the genomes of the gut microbiota .

  7. Achlorhydria - Wikipedia

    en.wikipedia.org/wiki/Achlorhydria

    Even without bacterial overgrowth, low stomach acid (high pH) can lead to nutritional deficiencies through decreased absorption of basic electrolytes (magnesium, zinc, etc.) and vitamins (including vitamin C, vitamin K, and the B complex of vitamins). Such deficiencies may be involved in the development of a wide range of pathologies, from ...

  8. Vitamin K deficiency - Wikipedia

    en.wikipedia.org/wiki/Vitamin_K_deficiency

    Vitamin K 1-deficiency may occur by disturbed intestinal uptake (such as would occur in a bile duct obstruction), by therapeutic or accidental intake of a vitamin K 1-antagonist such as warfarin, or, very rarely, by nutritional vitamin K 1 deficiency. As a result, Gla-residues are inadequately formed and the Gla-proteins are insufficiently active.

  9. Cecotrope - Wikipedia

    en.wikipedia.org/wiki/Cecotrope

    The anaerobic fermentation in the cecum breaks down the fiber into useable food for the animal. It is also used as food for the proliferating microbes. The results of the fermentation are volatile fatty acids (VFAs) (mostly acetic, butyric and propionic acids), all of the B vitamins, vitamin K, microbial proteins, essential amino acids and ...