a) It's caused by bacteria. Pericoronitis is an infection. It's caused by normal oral bacteria, like those found in dental plaque. It's the gum relationship around a partially-erupted tooth that allows pericoronitis to occur.
A futures exchange or futures market is a central financial exchange where people can trade standardized futures contracts; that is, a contract to buy specific quantities of a commodity or financial instrument at a specified price with delivery set at a specified time in the future. These types of contracts fall into the category of derivatives. The opposite of the futures market is the spots market, where trades will occur immediately (2 business days) after a transaction agreement has been made, rather than at a predetermined time in the future.
The Nikkei 225 Futures, introduced at the Osaka Securities Exchange in 1988, is now an internationally recognized futures index. In contrast to the Tokyo Stock Exchange, which mainly deals in spot trading, the Osaka Securities Exchangeâs strength is in derivative products.he OSE is the leading Derivatives Exchange in Japan and it was the largest futures market in the world in 1990 and 1991. According to statistics from 2003, the Osaka Securities Exchange handled 59% of the stock price index futures market in Japan, and almost 100% of trading in the options market.