Mineral salts pyridone broth is a selective medium for bacteria that can metabolizepyridone[?] (which is an unusual carbon source that only a select few types of bacteria can use). This medium is used to isolate bacteria belonging to the Arthrobacter genus among other bacteria genera.
... as the Metropolitan Railway, the City and South London Railway and Underground Electric Railways of London) are now closed and, for the most part, abandoned.
Aldwych ...