News tagged with vitamin
(Medical Xpress)—Despite spending billions of dollars on research and development, drug companies have been unable to come up with effective treatments for dementia and Alzheimer's Disease (AD). Now, A. ...
Neuroscience May 21, 2013 | 4.9 / 5 (17) | 0 |
(Medical Xpress)—Anticoagulants have saved the lives of those at risk for heart attack or stroke. However, because they prevent blood clotting, they can be dangerous to patients who suffer traumatic injuries or who require ...
Medical research Mar 05, 2013 | 5 / 5 (2) | 0 |
A new review of existing studies points toward a potential role for vitamin D in helping to prevent dental caries, or tooth decay.
Dentistry Nov 27, 2012 | 5 / 5 (3) | 1 |
For decades before antibiotics became generally available, sunshine was used to treat tuberculosis, with patients often being sent to Swiss clinics to soak up the sun's healing rays. Now, for the first time scientists have ...
Diseases, Conditions, Syndromes Sep 03, 2012 | 5 / 5 (5) | 0 |
Research conducted at the Angiogenesis Laboratory at Massachusetts Eye and Ear Infirmary, has for the first time, identified the mode of death of cone photoreceptor cells in an animal model of retinitis pigmentosa (RP).
Ophthalmology Aug 20, 2012 | 5 / 5 (2) | 1 |
With every meal, immune cells in the intestine stand like sentries at a citadel, turning away harmful bacteria but allowing vitamins and nutrients to pass.
Immunology Mar 14, 2012 | 5 / 5 (4) | 0 |
In a striking, unexpected discovery, researchers at Albert Einstein College of Medicine of Yeshiva University have determined that vitamin C kills drug-resistant tuberculosis (TB) bacteria in laboratory culture. The finding ...
Diseases, Conditions, Syndromes May 21, 2013 | 4.4 / 5 (7) | 0 |
(Medical Xpress)—Scientists at King's College London have discovered that Vitamin D has the potential to significantly reduce the symptoms of asthma. The study, led by Professor Catherine Hawrylowicz from ...
Immunology May 20, 2013 | 5 / 5 (1) | 0 |
In a comparison of the effect of different dosages of vitamin D supplementation in breastfed infants, no dosage raised and maintained plasma concentrations within a range recommended by some pediatric societies. However, ...
Health Apr 30, 2013 | not rated yet | 0 |
Liver fibrosis results from an excessive accumulation of tough, fibrous scar tissue and occurs in most types of chronic liver diseases. In industrialized countries, the main causes of liver injury leading ...
Medical research Apr 25, 2013 | 5 / 5 (1) | 0 |
Taking a specific form of a vitamin E supplement can accelerate the health benefits that occur when people quit smoking, new research suggests. In the small study, improvement in blood vessel function associated with the ...
Health Apr 23, 2013 | 5 / 5 (2) | 0 |
Researchers from Boston University School of Medicine (BUSM) have discovered that eating mushrooms containing Vitamin D2 can be as effective at increasing and maintaining vitamin D levels (25–hydroxyvitamin D) as taking ...
Health Apr 22, 2013 | 5 / 5 (3) | 1 |
A review of published research has found no evidence that drugs, herbal products or vitamin supplements help prevent cognitive decline in healthy older adults.
Health Apr 15, 2013 | 3.5 / 5 (2) | 1 |
Despite concerns that have been expressed about possible health risks from high intake of vitamin E, a new review concludes that biological mechanisms exist to routinely eliminate excess levels of the vitamin, and they make ...
Health Apr 15, 2013 | not rated yet | 1 |
Vitamin D is vital for making our muscles work efficiently and boosting energy levels, new research from Newcastle University has shown.
Medical research Apr 05, 2013 | not rated yet | 0 |
A vitamin is an organic compound required as a nutrient in tiny amounts by an organism. A compound is called a vitamin when it cannot be synthesized in sufficient quantities by an organism, and must be obtained from the diet. Thus, the term is conditional both on the circumstances and the particular organism. For example, ascorbic acid functions as vitamin C for some animals but not others, and vitamins D and K are required in the human diet only in certain circumstances. The term vitamin does not include other essential nutrients such as dietary minerals, essential fatty acids, or essential amino acids, nor does it encompass the large number of other nutrients that promote health but are otherwise required less often.
Vitamins are classified by their biological and chemical activity, not their structure. Thus, each "vitamin" may refer to several vitamer compounds that all show the biological activity associated with a particular vitamin. Such a set of chemicals are grouped under an alphabetized vitamin "generic descriptor" title, such as "vitamin A," which includes the compounds retinal, retinol, and many carotenoids. Vitamers are often inter-converted in the body.
Vitamins have diverse biochemical functions, including function as hormones (e.g. vitamin D), antioxidants (e.g. vitamin E), and mediators of cell signaling and regulators of cell and tissue growth and differentiation (e.g. vitamin A). The largest number of vitamins (e.g. B complex vitamins) function as precursors for enzyme cofactor bio-molecules (coenzymes), that help act as catalysts and substrates in metabolism. When acting as part of a catalyst, vitamins are bound to enzymes and are called prosthetic groups. For example, biotin is part of enzymes involved in making fatty acids. Vitamins also act as coenzymes to carry chemical groups between enzymes. For example, folic acid carries various forms of carbon group – methyl, formyl and methylene - in the cell. Although these roles in assisting enzyme reactions are vitamins' best-known function, the other vitamin functions are equally important.
Until the 1900s, vitamins were obtained solely through food intake, and changes in diet (which, for example, could occur during a particular growing season) can alter the types and amounts of vitamins ingested. Vitamins have been produced as commodity chemicals and made widely available as inexpensive pills for several decades, allowing supplementation of the dietary intake.
For more information about Vitamin, read the full article at
This text uses material from Wikipedia and is available under the GNU Free Documentation License.