For example, copper is added to the precious metal silver to make a more durable alloy for use in coins, housewares and jewelry. Coin silver, which was used for making silver coins in the past, contains 90% silver and 10% copper, by mass.
Metformin ER (Fortamet) Metformin ER (Fortamet) is an expensive drug used to treat type II diabetes. It helps control blood sugar in combination with diet and exercise. This drug is slightly less popular than comparable drugs. It is available in brand and generic versions.
Biofouling on the hull of a boat. Tributyltin (TBT) is an umbrella term for a class of organotin compounds which contain the (C 4 H 9) 3 Sn group, with a prominent example being tributyltin oxide.For 40 years TBT was used as a biocide in anti-fouling paint, commonly known as bottom paint, which was applied to the hulls of ocean going vessles.ven with its ban, TBT presents a danger to the environment. One of the most problematic aspects of TBT is its accumulation in sediments and its long half life of about 2 years. TBT often bonds to suspended material and sediments to the bottom, where it can remain and be released for up to 30 years.