Blue White Screen
The blue-white screen is a screening technique that allows for the rapid and convenient detection of recombinant bacteria in vector-based molecular cloning experiments. DNA of interest is ligated into a vector. The vector is then transformed into competent cell (bacteria), and the competent cells are grown in the presence of X-gal. Cells transformed with vectors containing recombinant DNA will produce white colonies; cells transformed with non-recombinant plasmids (i.e. only the vector) grow into blue colonies.
Read more about Blue White Screen: Background, Molecular Mechanism, Practical Considerations
Famous quotes containing the words blue, white and/or screen:
“There were ghosts that returned to earth to hear his phrases,
As he sat there reading, aloud, the great blue tabulae.
They were those from the wilderness of stars that had expected more.
There were those that returned to hear him read from the poem of life,
Of the pans above the stove, the pots on the table, the tulips among them.
They were those that would have wept to step barefoot into reality....”
—Wallace Stevens (1879–1955)
“Our foreparents were mostly brought from West Africa.... We were brought to America and our foreparents were sold; white people bought them; white people changed their names ... my maiden name is supposed to be Townsend, but really, what is my maiden name? What is my name?”
—Fannie Lou Hamer (1917–1977)
“Western man represents himself, on the political or psychological stage, in a spectacular world-theater. Our personality is innately cinematic, light-charged projections flickering on the screen of Western consciousness.”
—Camille Paglia (b. 1947)