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Tris(3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate is a chemical compound used as a polymer stabilizer in plastics. Like other hindered phenols it acts as a primary antioxidant. More than 1000 tonnes per year are used in the EU.
Light stabilizer are used to inhibit polymer photo-oxidation, which is the combined result of the action of light and oxygen. Like autoxidation this is a free radical process, hence the antioxidants described above are effective inhibiting agents, however additional classes of additives are also beneficial, such as UV absorbers, quenchers of ...
An intravasal control valve is a reversible valve implanted in the vas deferens with the ability to either inhibit or permit sperm passage depending on the position of the device. Bionyx has developed a T-shaped intravasal control valve composed of gold and stainless steel for use in humans. [ 5 ]
In polymer science, dispersion polymerization is a heterogeneous polymerization process carried out in the presence of a polymeric stabilizer in the reaction medium. . Dispersion polymerization is a type of precipitation polymerization, meaning the solvent selected as the reaction medium is a good solvent for the monomer and the initiator, but is a non-solvent for the po
With typical use (i.e., it may not be used perfectly), 9% of women will become pregnant during the first year of using a combined hormonal birth control method, ACOG says. With perfect use, less ...
Birth control, also known as contraception, anticonception, and fertility control, is the use of methods or devices to prevent pregnancy. [ 1 ] [ 2 ] Birth control has been used since ancient times, but effective and safe methods of birth control only became available in the 20th century. [ 3 ]
This program decreased unplanned adolescent pregnancies in Colorado by about half. There was a similar decline of unplanned pregnancies in unmarried women under 25 who have not finished high school. Use of LARC methods by children of child-bearing age in the state increased to 20% during the 2009–2014 period.
Levonorgestrel-releasing implant, sold under the brand name Jadelle among others, are devices that release levonorgestrel for birth control. [1] It is one of the most effective forms of birth control with a one-year failure rate around 0.05%. [1] [2] The device is placed under the skin and lasts for up to five years. [3]