Horizontal gene transfer also plays a role in the spread of virulence factors, such as exotoxins and exoenzymes, amongst bacteria. A prime example concerning the spread of exotoxins is the adaptive evolution of Shiga toxins in E. coli through horizontal gene transfer via transduction with Shigella species of bacteria.
The brothers grew up on a succession of Oklahoma and Kansas homesteads during... On this day in 1911, President Ronald Wilson Reagan is born in Tampico, Illinois. Ronald Reagan, the 40th president of the United States, served for two terms from 1981 to 1989.
Presidency of Ronald Reagan. The presidency of Ronald Reagan began on January 20, 1981, when Ronald Reagan was inaugurated as President of the United States, and ended on January 20, 1989. Reagan, a Republican, took office as the 40th United States president following a landslide win over Democratic incumbent President Jimmy Carter in the 1980 presidential election.