Category: V

Von Willerbrands disease (VWD) is a common, mild type of congenital coagulopathy (bleeding disorders; Miller, Pearson, Baehner, & McMillan, 1978). VWD is thought to be associated with an X-linked autosomal dominant genetic disorder leading to a deficiency in the soluble clotting Factor VIII (antihemophilic factor) complex responsible for coagulatory responses. The prevalence of VWD has…

Vitamin E is an essential nutrient for maintaining the structural and functional integrity of the developing human nervous system, skeletal muscle, and the retina. When vitamin E deficiency does occur, it strikes people who have diseases that prevent the absorption of dietary fats and fat-soluble nutrients.  

Visual impairment is loss of visual acuity, visual field, or both as a result of defect, disease, or injury to the organs of vision (eye, optic nerve, visual tract, and brain). Even with correction, ability to see is significantly below the level that allows normal visual access to information and the environment. The extent to…

Visual efficiency disorders consist of a variety of vision problems such as nearsightedness, farsightedness, astigmatism, teaming disorders, focusing disorders, and tracking disorders. The most common efficiency disorders are focusing, binocularity (eye teaming), and tracking. Near focusing and flexibility focusing are required for an individual to process visual information up close and to shift visual focus…

Excess consumption of some vitamins can produce toxic effects. Vitamins A and D are typically considered the most potentially toxic. Daily vitamin intake should not exceed the Tolerable Upper Intake Level (UL) established by the Food and Nutrition Board of the National Academy of Sciences for those vitamins for which a UL has been set.…

Vinpocetine is a synthetic ethyl ester of apovincamine and is among the family of drugs called vinco alkaloids. It has been used to improve cerebral perfusion of acute stroke survivors; however, it is not clear if it is an effective treatment.  

Vanadium is a micromineral found in trace amounts within the body and the diet. Food sources most rich in vanadium include spinach, shellfish, black pepper, mushrooms, and parsley. Vanadium has not been established as an essential nutrient; however, it has been demonstrated to have functions similar to those of insulin in humans with non-insulin-dependent diabetes…

A rare genetic disorder characterized by excess glycogen stores in liver and muscles due to a mutation in the gene for the enzyme glucose-6-phosphatase. Also called type I glycogen storage disease. Von Gierke disease is an inherited disorder caused by an inborn lack of the enzyme glucose-6-phosphatase (G6Pase). G6Pase is critical for its role in…

Short-chain (carbons fewer than eight) fatty acids that volatilize at room temperature.  

Body protein in components other than muscle tissue such as internal organs and blood.