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:
“The Reverend Samuel Peters ... exaggerated the Blue Laws, but they did include “Capital Lawes” providing a death penalty for any child over sixteen who was found guilty of cursing or striking his natural parents; a death penalty for an incorrigible son; a law forbidding smoking except in a room in a private house; another law declaring smoking illegal except on a journey five miles away from home,...”
—Administration for the State of Con, U.S. public relief program (1935-1943)
“Then came Corinna in a long loose gown,
Her white neck hid with tresses hanging down,
Resembling fair Semiramis going to bed,”
—Ovid (Publius Ovidius Naso)
“The End?”
—Theodore Simonson. Irvin S. Yeaworth, Jr.. End title card, The Blob, printed on screen at the end of the movie (1958)