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.
Together with Djibouti, Ethiopia, northern Somalia, and the Red Sea coast of Sudan, Eritrea is considered the most likely location of the land known to the Ancient Egyptians as Punt, whose first mention dates to the 25th century BC.ostilities between Eritrea and Ethiopia persisted, leading to the EritreanâEthiopian War of 1998â2000 and further skirmishes with both Djibouti and Ethiopia. Eritrea is a member of the African Union, the United Nations, and IGAD, and is an observer in the Arab League.