Bolsa de Madrid Bolsa de Madrid Bolsa de Madrid (; Madrid Stock Exchange) is the largest and most international of Spain's four regional stock exchanges (the others are located in Barcelona, Valencia, and Bilbao) that trade shares and convertible bonds and fixed income securities, and both government and private-sector debt. Bolsa de Madrid is owned by Bolsas y Mercados Españoles. The reorganisation of Spain's financial market under the national umbrella of the Spanish Stock Market includes the "bolsas", the derivatives markets, and fixed-income markets. Trading is linked through the electronic Spanish Stock Market Interconnection System (SIBE), which handles more than 90% of transactions;
Dioscorea mexicana caudex, bear heart-shaped leaves. "Dioscorea mexicana" ranges from the state of San Luis Potosí in northeastern Mexico south to Panama. It is notable for its production of diosgenin, which is a precursor for the synthesis of hormones such as progesterone. Russell Marker developed the extraction and manufacture of hormones from "D. mexicana" at Syntex. Later the Mexican barbasco trade focused instead on "Dioscorea composita" instead, as this variety has a higher diosgenin content. Dioscorea mexicana Dioscorea mexicana, Mexican yam or cabeza de negro is a species of yam in the genus "Dioscorea". "Dioscorea mexicana" is a caudiciform dioscorea having either