A crude lysate gel assay can be performed to roughly quantitate the DNA in lysates. This is often a valuable time saving step to determine if the phage yield is sufficient to warrant continuing the procedure. - [Read Gel Assay to Determine DNA Content of Phage Lysates Protocol]
Most manipulations with M13, including preparations of viral stocks and isolation of single- and double-stranded DNAs, begin with small-scale liquid cultures that are infected with an M13 plaque, picked from an agar plate. - [Read Growing Bacteriophage M13 in Liquid Culture Protocol]
There are essentially three parts to this protocol: 1. growth of at least 5x10e8 pfu phage to provide an inoculum growth of a larger liquid lysate that will produce about 5x10e12 pfu; 2. concentration and purification of the phage, and; 3. DNA preparation. - [Read Growth and Purification of 25-100 ug Lambda Clone DNA Protocol]
5 ml liquid lysates are prepared when a small amount of DNA from a large number of lambda clones is needed. The lysates can be made using 10- 20 ul of a stock lysate or a 100-fold amplified phage "macroplaque" as the inoculum. - [Read Liquid Phage Lysates Protocol]
To prepare phage lysates to be used for small or large scale phage DNA preps. This method usually produces lysates with titers of 2-8x10e10 pfu/ml. - [Read Phage Plate Stock Lysates Protocol]
In this protocol, a bacterial lysogen is constructed from a recombinant bacteriophage {lambda} encoding a fusion protein of interest. The resulting lysogenic colonies are induced to synthesize the fusion protein, which is then isolated in preparation for functional and biochemical analyses. - [Read Preparation of Lysates Containing Fusion Proteins Encoded by Bacteriophage {lambda} Lysogens]
Phage are streaked onto a medium to obtain an independent isolate prior to preparing a new lysate. This is done to reduce the likelihood of working with lysates which have become contaminated, and/or have accumulated mutations. - [Read Streaking Lambda Phages Protocol]
When an individual bacterial virus grows in a bacterial host suspended in a top agar lawn, its progeny infect and lyse the surrounding host cells. This causes the appearance of a "hole" or plaque in the otherwise homogeneous bacterial lawn. Since each plaque represents a single virus, the number of viruses in the aliquot added to the plate is equal to the number of plaques which appear. - [Read Titering of Bacterial Viruses Protocol]