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(microbiology, virology) A virus that specifically infects bacteria.
Borrowing from French bactériophage, coined by microbiologist Félix d'Hérelle, from bacterio- (“bacteria”) + -phage (“eater”).
Sources include bacteriophage lambda, salmon sperm and even cloned human DNA.
Delbrueck chose to use bacteriophage, viruses that infect bacteria and then can multiply very rapidly.
This exercise demonstrates the principles of restriction site mapping, using DNA from the lambda bacteriophage.
In fact, toxin production is related to infections of the bacillus itself with a particular bacteria virus called a phage (from bacteriophage, a virus that infects bacteria).
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