Elective culture of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans in 9K medium modified with pyrrhotite was studied.Bioleaching of flotation concentrate of sphalerite by the selected bacteria was ca...Elective culture of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans in 9K medium modified with pyrrhotite was studied.Bioleaching of flotation concentrate of sphalerite by the selected bacteria was carried out.The results show that the microorganisms cultured by pyrrhotite are a mixture of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans,of which the capability to oxidize ferrous to ferric irons is enhanced by the high mass ratio of Fe to S in pyrrhotite.Three pyrrhotite samples were separated into various parts with corresponding S/Fe ratios by magnetic separation and were used to culture the elective bacteria as the substrate.The association of the cultures could provide a more rapid and complete oxidation of sphalerite than that of bacteria cultivated by conventional methods.展开更多
On August 16, Sri Lanka’s opposition People’s Alliance defeated the United National Party that ruled Sri Lanka for 17 years, but it failed to win a majority of seats in Parliament and began to woo political parties ...On August 16, Sri Lanka’s opposition People’s Alliance defeated the United National Party that ruled Sri Lanka for 17 years, but it failed to win a majority of seats in Parliament and began to woo political parties to form a coalition government. After winning election, Sri Lanka’S president invited the opposition People’s Alliance to form a new government.展开更多
Former prime minister of Ukraine Leonid Kuchma won Ukraine’s presidential election on July 11. Kuchma favours economic union with Moscow. He became the second president of Ukraine. Kuchma took the oath of office on J...Former prime minister of Ukraine Leonid Kuchma won Ukraine’s presidential election on July 11. Kuchma favours economic union with Moscow. He became the second president of Ukraine. Kuchma took the oath of office on July 19.展开更多
Millions of people of the Soviet Union voted on March 17 in a referendum on the future of the Soviet Union which President Mikhail Gorhachev says could decide whether the vast state survives or breaks up. Six republic...Millions of people of the Soviet Union voted on March 17 in a referendum on the future of the Soviet Union which President Mikhail Gorhachev says could decide whether the vast state survives or breaks up. Six republics had refused to展开更多
The Japanese Government dissolved parliament (Diet) on June 18 in the wake of its shock defeat in a confidence vote ovar political corruption. A general election must be held within 40 days. A total of 39 LDP members ...The Japanese Government dissolved parliament (Diet) on June 18 in the wake of its shock defeat in a confidence vote ovar political corruption. A general election must be held within 40 days. A total of 39 LDP members voted against Prime Minister Kiichi Miyazawa in protest at his failure to keep a pledge to curb Japan’s pandemic "money politics". Chinese President Jiang Zemin held talks in Beijing on June 19 with Miguel Dos Anjos Trovoada, President of Sao Tome and Principe, two islands in the Gulf of Guinea off west Africa.展开更多
(April 1-15, 1991) It was announced on April 1 that in the 12th election of the national assembly, the Albanian Labour Party won 162 of the 250 seats in the people’s assembly in Albania’s first multi-party elections...(April 1-15, 1991) It was announced on April 1 that in the 12th election of the national assembly, the Albanian Labour Party won 162 of the 250 seats in the people’s assembly in Albania’s first multi-party elections in more than 60 years,but President Ramiz Alia was defeated. On April 3, the UN Security Council adopted, by a vote of展开更多
Queen Elizabeth signed a royal proclamation of dissolving the Parliament and a three-week general election campaign of Britain officially began on May 18.
基金Project(50621063)supported by the National Natural Science Foundation of ChinaProject(2004CD619205)supported by the Major StateBasic Research Development Program of China
文摘Elective culture of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans in 9K medium modified with pyrrhotite was studied.Bioleaching of flotation concentrate of sphalerite by the selected bacteria was carried out.The results show that the microorganisms cultured by pyrrhotite are a mixture of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans,of which the capability to oxidize ferrous to ferric irons is enhanced by the high mass ratio of Fe to S in pyrrhotite.Three pyrrhotite samples were separated into various parts with corresponding S/Fe ratios by magnetic separation and were used to culture the elective bacteria as the substrate.The association of the cultures could provide a more rapid and complete oxidation of sphalerite than that of bacteria cultivated by conventional methods.
文摘On August 16, Sri Lanka’s opposition People’s Alliance defeated the United National Party that ruled Sri Lanka for 17 years, but it failed to win a majority of seats in Parliament and began to woo political parties to form a coalition government. After winning election, Sri Lanka’S president invited the opposition People’s Alliance to form a new government.
文摘Former prime minister of Ukraine Leonid Kuchma won Ukraine’s presidential election on July 11. Kuchma favours economic union with Moscow. He became the second president of Ukraine. Kuchma took the oath of office on July 19.
文摘Millions of people of the Soviet Union voted on March 17 in a referendum on the future of the Soviet Union which President Mikhail Gorhachev says could decide whether the vast state survives or breaks up. Six republics had refused to
文摘The Japanese Government dissolved parliament (Diet) on June 18 in the wake of its shock defeat in a confidence vote ovar political corruption. A general election must be held within 40 days. A total of 39 LDP members voted against Prime Minister Kiichi Miyazawa in protest at his failure to keep a pledge to curb Japan’s pandemic "money politics". Chinese President Jiang Zemin held talks in Beijing on June 19 with Miguel Dos Anjos Trovoada, President of Sao Tome and Principe, two islands in the Gulf of Guinea off west Africa.
文摘(April 1-15, 1991) It was announced on April 1 that in the 12th election of the national assembly, the Albanian Labour Party won 162 of the 250 seats in the people’s assembly in Albania’s first multi-party elections in more than 60 years,but President Ramiz Alia was defeated. On April 3, the UN Security Council adopted, by a vote of
文摘Queen Elizabeth signed a royal proclamation of dissolving the Parliament and a three-week general election campaign of Britain officially began on May 18.
