A kind of chemical that (at least in theory) may protect against some common health problems and possibly certain effects of aging.
Polyphenols act as antioxidants. They protect cells and body chemicals against damage caused by free radicals, reactive atoms that contribute to tissue damage in the body. For example, when low-density lipoprotein (LDL) cholesterol is oxidized, it can become glued to arteries and cause coronary heart disease.
Polyphenols can also block the action of enzymes that cancers need for growth and they can deactivate substances that promote the growth of cancers. The polyphenol most strongly associated with cancer prevention is epigallocatechin-3-gallate, or EGCG.
All tea contains polyphenols. Teas and polyphenols isolated from tea have been shown in the laboratory to act as scavengers of oxygen and nitrogen-free radicals, protecting the fatty membranes of cells, proteins and DNA. However, the results of human studies of tea and polyphenols to date (2001) have been inconsistent and have yet to prove anything one way or the other as regards the value of polyphenols.
- Heart Disease:
What tests did you have to diagnose your heart disease? View 10 Comments • Submit » The term heart disease is very broad and includes a number of conditions, ranging from congenital (inborn) abnormalities of the heart to coronary artery disease caused by atherosclerosis. Read more about heart disease symptoms and signs »
Having three or more full sets of chromosomes. For example, a polyploid brain tumor cell might have 69 or 92 chromosomes.
- Polypsis of the colon
Multiple polyps with a high malignant potential in the large bowel. This hereditary condition is also known as polypsis coli and Familial Adenomatous Polyposis (FAP).
Continuous recording of specific physiologic variables during sleep. Polysomnography typically records brain wave changes (electroencephalogram), eye movements (electrooculogram), muscle tone (electromyogram), respiration, electrocardiogram (EKG), and leg movements.
The binding of many ubiquitin molecules to the same target protein. Polyubiquitination of proteins is the triggering signal that leads to degradation of the protein in the proteasome. It is polyubiquitination that constitutes the “kiss of death” for the protein.