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Thyroxine, also known as T 4, is a hormone produced by the thyroid gland.It is the primary form of thyroid hormone found in the blood and acts as a prohormone of the more active thyroid hormone, triiodothyronine (T 3). [1]
Thyroid hormones act on nearly every cell in the body. They act to increase the basal metabolic rate, affect protein synthesis, help regulate long bone growth (synergy with growth hormone) and neural maturation, and increase the body's sensitivity to catecholamines (such as adrenaline) by permissiveness. [12]
T4 is a prohormone; that is, T4 is a precursor to the hormone T3. Whereas T4 is a tetraiodide, T3 is a triiodide, triiodothyronine. The T4 → T3 conversion is mediated by the selenoenzyme iodothyronine deiodinase. T3-thyroxine is a unique example of an iodine compound that is essential for human health.
The Volkswagen Transporter (T4), marketed in North America as the Volkswagen EuroVan, is a van produced by the German manufacturer Volkswagen Commercial Vehicles between 1990 and 2004, succeeding the Volkswagen Type 2 (T3) and superseded by the Volkswagen Transporter (T5).
T4 road (Tanzania), a road in Tanzania; Lockheed Martin's High beta fusion reactor prototype, called T4; A T4 slip, a tax return form used in income taxes in Canada; Aktion T4, Nazi Germany's mass-murder of the mentally and physically disabled; Normal space in topology; Version 4 of Traveller role-playing game; T4, one of several fluorescent ...
Aktion T4 (German, pronounced [akˈtsi̯oːn teː fiːɐ]) was a campaign of mass murder by involuntary euthanasia which targeted people with disabilities in Nazi Germany. The term was first used in post- war trials against doctors who had been involved in the killings. [ 4 ]
The first officially designated "T platform" vehicle, the Volkswagen Transporter (T4) [1] dramatically updated the Volkswagen van line by using a front-mounted, front-wheel drive, water-cooled engine. The T4 was marketed in North America as the Volkswagen Eurovan.
Escherichia virus T4 is a species of bacteriophages that infect Escherichia coli bacteria. It is a double-stranded DNA virus in the subfamily Tevenvirinae of the family Straboviridae . T4 is capable of undergoing only a lytic life cycle and not the lysogenic life cycle .