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Vitamers - Ascorbic Acid, Calcium Ascorbate, Cholecalciferol, Cobamamide, Ergocalciferol, Phylloquinone, Sodium Ascorbate, Tocoph (Paperback)
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Vitamers - Ascorbic Acid, Calcium Ascorbate, Cholecalciferol, Cobamamide, Ergocalciferol, Phylloquinone, Sodium Ascorbate, Tocoph (Paperback)
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Loot Price R305
Discovery Miles 3 050
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Please note that the content of this book primarily consists of
articles available from Wikipedia or other free sources online.
Pages: 24. Chapters: Ascorbic acid, Calcium ascorbate,
Cholecalciferol, Cobamamide, Ergocalciferol, Phylloquinone, Sodium
ascorbate, Tocopherol, Tocotrienol, Vitamer, Vitamin K. Excerpt:
Vitamin K is a group of structurally similar, fat-soluble vitamins
that the human body needs for posttranslational modification of
certain proteins required for blood coagulation, and in metabolic
pathways in bone and other tissue. They are
2-methyl-1,4-naphthoquinone (3-) derivatives. This group of
vitamins includes two natural vitamers: vitamin K1 and vitamin K2.
Vitamin K1, also known as phylloquinone, phytomenadione, or
phytonadione, is synthesized by plants, and is found in highest
amounts in green leafy vegetables because it is directly involved
in photosynthesis. It may be thought of as the "plant form" of
vitamin K. It is active in animals and may perform the classic
functions of vitamin K in animals, including its activity in the
production of blood clotting proteins. Animals may also convert it
to vitamin K2. Vitamin K2, the main storage form in animals, has
several subtypes, which differ in isoprenoid chain length. These
vitamin K2 homologs are called menaquinones, and are characterized
by the number of isoprenoid residues in their side chains.
Menaquinones are abbreviated MK-n, where M stands for menaquinone,
the K stands for vitamin K, and the n represents the number of
isoprenoid side chain residues. For example, menaquinone-4
(abbreviated MK-4) has four isoprene residues in its side chain.
Menaquinone-4 (also known as menatetrenone from its four isoprene
residues) is the most common type of vitamin K2 in animal products
since it is normally synthesized from vitamin K1 in certain animal
tissues (arterial walls, pancreas, and testes) by replacement of
the phytyl tail with an unsaturated geranylgeranyl tail containing
four isoprene units, thus yielding menaquinone-4. This homolog of
vitamin K2 may have enzyme functions that are distinct from those
of vitamin K1. Bacteria in the colon (large intestine) can also
convert K1 into vitamin K2. In addition, bacteria typically
lengthen the isopreneoid side chain of vitamin K2 to produce a
range of vitamin K2 for
General
Imprint: |
Books LLC, Wiki Series
|
Country of origin: |
United States |
Release date: |
April 2013 |
First published: |
April 2013 |
Authors: |
Source Wikipedia
|
Creators: |
Books Llc
|
Dimensions: |
246 x 189 x 1mm (L x W x T) |
Format: |
Paperback - Trade
|
Pages: |
290 |
ISBN-13: |
978-1-156-07870-9 |
Barcode: |
9781156078709 |
Categories: |
Books
Promotions
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LSN: |
1-156-07870-9 |
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