Tatiana Tropina

Learn More
Since rising to prominence in the UK, functional separation has been widely discussed as a way to address the tensions that exist between incumbent fixed-wire telecommunications operators and new entrants that use their networks. The suggestion that functional separation could be employed by national regulatory authorities to achieve structural objectives(More)
Antigens have been obtained from standard Listeria strains 1 and 4a by alcohol precipitation, sonication and multiple freezing and thawing. From these antigens protein fractions, immunologically identical as shown by the precipitation test and immunoelectrophoresis and similar in their chemical composition, have been isolated. The immunogenic properties of(More)
  • 1