The cell wall surrounds the cell membrane in plant cells, bacteria, and some fungi. In plant cells, the cell wall is composed of cellulose. In bacteria, the wall is made mostly of polypeptides (protein) or polysaccharides (carbohydrates). The cell wall provides support and protection and is responsible for giving plant cells their shape. Another important structure found only in eukaryotic cells is the nucleus . This struc-ture contains the genetic information and is the control center of the cell. Protecting the nucleus is a double-membrane called the nuclear envelope , which, like the plasma membrane, is semi-permeable.
Welcome to the Bisha Mining Share Company. Bisha Mining is an Eritrean company formed for the development and operation of the Bisha Mine in western Eritrea. It is owned by Nevsun Resources Ltd. (60%) and the Eritrean National Mining Corporation (ENAMCO) (40%). The Bisha Mine is a high-grade copper, gold, silver and zinc mine that commenced production in February 2011.
Eritrea (/ËÉráµ»ËtreÉª.É/ or /ËÉráµ»ËtriËÉ/), officially the State of Eritrea, is a country in the Horn of Africa. With its capital at Asmara, it is bordered by Sudan in the west, Ethiopia in the south, and Djibouti in the southeast. The northeastern and eastern parts of Eritrea have an extensive coastline along the Red Sea.