Whereas old dependency theory was Marxist in presentation, but nationalist in orientation, seeking to combine a theory of class struggle with a nationalist âthird worldistâ ideology, the new dependency theory is institutionalist in its analysis and political orientation.
Griffith concluded that the type II-R had been transformed into the lethal III-S strain by a transforming principle that was somehow part of the dead III-S strain bacteria. Today, we know that the transforming principle Griffith observed was the DNA of the III-s strain bacteria. While the bacteria had been killed, the DNA had survived the heating process and was taken up by the II-R strain bacteria. The III-S strain DNA contains the genes that form the protective polysaccharide capsule.
Frederick Griffith's Discovery of the Transforming Principle in Bacterial Organisms. Frederick Griffith was searching for a vaccine against Spanish flu and was using two strains of Streptococcus pneumoniae bacteria. During the process he discovered that gene transfer took place between two different bacterial strains. slide 1 of 4. Bacteria Microbiology Frederick Griffith's experiment showed that bacteria were capable of transferring their genetic information by a process that he called transformation. Frederick Griffith was an English army doctor and his experiment, which consisted of testing the effects of killed bacteria on live cells, was actually intended to help develop a vaccine against a future outbreak of Spanish flu, the pandemic that killed millions of people after world War I.