单词:electrophoretic migration
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This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute. People get malaria from Anopheles mosquitoes that themselves are infected with a protozoan parasite called Plasmodium. The mosquitoes do have immune sy
These 60 paintings tell about the movement of African-Americans in the first half of the 20th century. Transcript of radio broadcast: 06 July 2008 VOICE ONE: Welcome to THIS IS AMERICA in VOA Special English. I'm Steve Ember. VOICE TWO: And I'm Barb
By Jane M Friedman Washington, DC 20 April 2006 watch Biotech Industry report A report by the consulting firm Ernst and Young says that, although huge pharmaceutical firms like Merck and Pfizer pour b
By Scott Bobb Johannesburg 08 November 2007 The European Union has announced a plan to admit 20-million skilled workers during the next 20 years in order to meet projected labor shortages. The proposal has drawn protests from leaders in developing na
By Steve Mort Istanbul 14 December 2006 watch Alliance of Civilizations A new study says politics -- rather than religion -- is at the heart of a growing divide between the West and the Muslim world. The yearlong study was carried out by the Allianc