Difco Nutrient Broth (DNB)
Difco Nutrient Broth is a rich medium commercially available from BD and routinely used for cultivating many non-fastidious organisms. It contains beef extract and peptones; exact composition will vary between batches.
- 4g Difco Nutrient Broth Powder
- 1L dH2O
- Add DNB powder to dH2O and mix to dissolve
- Selection for resistance to salt-sensitive antibiotics
According to the recipe in Practical Streptomyces Genetics, it should be 8g of DNB per litre, however some groups choose to use 4g instead. This has little effect on the ability of Streptomyces to grow on the soild medium, DNA.