Hormonal contraceptives also have effects on the endometrium that theoretically could affect implantation; however, no scientific evidence indicates that prevention of implantation actually results from their use.The 20 cm2 Ortho Evra contraceptive patch contains 750 µg ethinylestradiol (an estrogen) and 6000 µg norelgestromin (a progestin). The 20 cm2 Evra contraceptive patch contains 600 µg ethinylestradiol and 6000 µg norelgestromin. The Ortho Evra contraceptive patch and the Evra contraceptive patch are both intended to gradually release into the systemic circulation approximately 20 µg/day of ethinylestradiol and 150 µg/day of norelgestromin. Lawsuits
The patch has been associated with strokes and thrombosis and the mechanism for hormone absorption and dissipation from the bodys tissues is different from "the pill". Several lawsuits have been instigated over these issues.A lawsuit filed in Federal Court in New Jersey on September 2, 2005, by a Georgia woman who had a pulmonary embolism alleges the company promoted the patch despite knowledge of its health risks, for financial gain, while failing to warn of the risks of blood clots and other injuries.The parents of a 14-year-old girl from Wisconsin have filed a lawsuit against Johnson & Johnson because they claim that she died from a blood clot that arose from her use of the patch. References
External links
"Ethinyl Estradiol mixture with norelgestromin". Drug Information Portal. U.S. National Library of Medicine. Feminist Womens Health Center
Planned Parenthood: The Patch
Some problems with this alternative process include the high consumption of thiosulfate, and the lack of a suitable recovery technique, since [Au(S2O3)2]3− does not adsorb to activated carbon, which is the standard technique used in gold cyanidation to separate the gold complex from the ore slurry. Iodometry
In analytical chemistry, the most important use comes because the thiosulfate anion reacts stoichiometrically with iodine in aqueous solution, reducing it to iodide as the thiosulfate is oxidized to tetrathionate:

2 S2O2−3 + I2 → S4O2−6 + 2 I−Due to the quantitative nature of this reaction, as well as because Na2S2O3·5H2O has an excellent shelf-life, it is used as a titrant in iodometry. Na2S2O3·5H2O is also a component of iodine clock experiments. This particular use can be set up to measure the oxygen content of water through a long series of reactions in the Winkler test for dissolved oxygen. It is also used in estimating volumetrically the concentrations of certain compounds in solution (hydrogen peroxide, for instance) and in estimating the chlorine content in commercial bleaching powder and water. Aluminium cation reaction
Sodium thiosulfate is used in analytical chemistry. It can, when heated with a sample containing aluminium cations, produce a white precipitate:

2 Al3+ + 3 S2O2−3 + 3 H2O → 3 SO2 + 3 S + 2 Al(OH)3

Organic chemistry
Alkylation of sodium thiosulfate gives S-alkylthiosulfates, which are called Bunte salts. The alkylthiosulfates are susceptible to hydrolysis, affording the thiol.