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History of Sudan (1956–69)
On 1 January 1956 Anglo-Egyptian Sudan become the independent Republic of the Sudan. Before 1955, however, the government under Ismail al-Azhari had temporarily halted Sudan's progress toward self-determination, hoping to promote unity with Egypt. Despite his pro-Egyptian National Unionist Party (NUP) winning a majority in the 1953 parliamentary elections, however, Azhari realized that popular opinion had shifted against such a union. Azhari, who had been the major spokesman for the "unity of the Nile Valley", therefore reversed the NUP's stand and supported Sudanese independence. On December 19, 1955, the Sudanese parliament, under Azhari's leadership, unanimously adopted a declaration of independence that became effective on January 1, 1956. Azhari called for the withdrawal of foreign troops and requested the condominium powers to sponsor a plebiscite in advance.
Politics of independence
Sudan achieved independence without the rival political parties having agreed on the form and content of a permanent constitution. Instead, the Constituent Assembly adopted a document known as the Transitional Constitution, which replaced the governor general as head of state with a five-member Supreme Commission that was elected by a parliament composed of an indirectly elected Senate and a popularly elected House of Representatives. The Transitional Constitution also allocated executive power to the prime minister, who was nominated by the House of Representatives and confirmed in office by the Supreme Commission.
Islamization of the Sudan region
The Islamization of the Sudan region (Sahel) encompasses a prolonged period of military conquest and religious conversion spanning from the 8th to 16th century. The aftermath of religious incursion and sectarian conflict remains a source of ongoing tension throughout the Sahel states.
Following the 8th-century Muslim conquest of North Africa, Arab Muslims began leading expeditions into Sub-Saharan Africa - first along the Nile Valley towards Nubia and later across the Sahara into West Africa. Much of this contact was motivated by interest in trans-Saharan trade, particularly the slave trade.
The proliferation of Islamic influence was largely a gradual process. The Christian kingdoms of Nubia were the first to experience Arab incursion starting in the 7th century. They held out through the Middle Ages until the Kingdom of Makuria and Old Dongola both collapsed in the early 14th century. Sufi orders played a significant role in the spread of Islam from the 9th to 14th centuries, and they proselytized across trade routes between North Africa and the sub-Saharan kingdoms of Ghana and Mali. They were also responsible for setting up zawiyas on the shores of the River Niger.
History of Sudan (1821–85)
The History of Sudan under Muhammad Ali and his successors traces the period from Muhammad Ali Pasha's invasion of Sudan in 1820 until the fall of Khartoum in 1885 to Muhammad Ahmad, the self-proclaimed Mahdi. This era of Ottoman control is commonly known as the Turkiyah.
Background
Although a part of present-day northern Sudan was nominally an Egyptian dependency during the Mamluk and Ottoman periods, previous Egyptian rulers had demanded little more from the Sudanese Kashif than the regular remittance of tribute. However, after Muhammad Ali crushed the Mamluks in Egypt, a party of them escaped and fled south. In 1811 these Mamluks established a state at Dunqulah as a base for their slave trading. In 1820 the Sultan of Sennar informed Muhammad Ali that he was unable to comply with the demand to expel the Mamluks. In response Muhammad Ali sent 4,000 troops to invade Sudan, clear it of Mamluks, and incorporate it into Egypt. His forces received the submission of the Kashif, dispersed the Dunqulah Mamluks, conquered Kurdufan, and accepted Sannar's surrender from the last Funj sultan, Badi VII. However, the Arab Ja'alin tribes offered stiff resistance.
Sudan
Sudan (Arabic: السودان as-Sūdān, English pronunciation (US) 
i/suˈdæn/, (GB) /suːˈdɑːn/), officially the Republic of the Sudan (Arabic: جمهورية السودان Jumhūrīyat as-Sūdān), is a country in north-east Africa. It is bordered by Egypt to the north, the Red Sea, Eritrea, and Ethiopia, to the east, South Sudan to the south, the Central African Republic to the southwest, Chad to the west and Libya to the northwest. It is the third largest country in Africa. The River Nile divides the country into eastern and western halves. Its predominant religion is Islam.
Sudan was home to numerous ancient civilizations, such as the Kingdom of Kush, Kerma, Nobatia, Alodia, Makuria, Meroë and others, most of which flourished along the Nile. During the pre-dynastic period Nubia and Nagadan Upper Egypt were identical, simultaneously evolved systems of pharaonic kingship by 3300 BC. By virtue of its proximity to Egypt, the Sudan participated in the wider history of the Near East inasmuch as it was Christianized by the 6th century, and Islamized in the 15th. As a result of Christianization, the Old Nubian language stands as the oldest recorded Nilo-Saharan language (earliest records dating to the 9th century). Sudan was the largest country in Africa and the Arab world until 2011, when South Sudan separated into an independent country, following an independence referendum. Sudan is now the third largest country in Africa (after Algeria and the Democratic Republic of the Congo) and also the third largest country in the Arab world (after Algeria and Saudi Arabia).
Sudan stain
Sudan stains and Sudan dyes are synthetic organic compounds that are used as dyes for various plastics and are also used to stain sudanophilic biological samples, usually lipids. Sudan II, Sudan III, Sudan IV, Oil Red O, and Sudan Black B are important members of this class of compounds (see images below).
Staining
Sudan dyes have high affinity to fats, therefore they are used to demonstrate triglycerides, lipids, and lipoproteins. Alcoholic solutions of Sudan dyes are usually used, however pyridine solutions can be used in some situations as well.
Sudan stain test is often used to determine the level of fecal fat to diagnose steatorrhea. A small sample is dissolved in water or saline, glacial acetic acid is added to hydrolyze the insoluble salts of fatty acids, a few drops of alcoholic solution of Sudan III are added, the sample is spread on a microscopic slide, and heated twice to boil. Normally a stool sample should show only a few drops of red-orange stained fat under the microscope. The method is only semiquantitative but, due to its simplicity, it is used for screening.
Sudan (beverage)
Sudan (Hangul: 수단; hanja: 水團 or 水鍴) is a kind of Korean traditional drink made of honey water and rice cake. It is usually served during the summer for quenching thirst. Traditionally Sudan was always served during a village rite in 6th month in lunar calendar. Korean farmers prayed for a bountiful harvest and god’s blessing for their life in the future by making food offering including foods and Sudan drink.
