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Materials and Methods
Experimental Procedures and Results
2 other sections not shown
adaptation of influenza animal viruses anti-Lansing serum antigenic attempts to induce bacteriophage brain and cord Brunhilde virus cell character characteristics cord suspension desoxyribose nucleic acid domestic rabbits equal volume experiments described fibroma final dilution fixed virus gene mutations gene-like units genetic higher organisms inactivated incubated induce mutations infection influenza virus inoculated Lansing virus lanthanum lethal mg/ml mice received mixed with equal mixture monkeys mouse brain mouse lung mouse-virulence mustard gas mutagenic mutations in higher myxoma virus myxomatosis Negri bodies neurotropic variant neutralizing nitrogen mustard number of serial observed occurred Paris strain passage material passages in mice pathogenic mutant penicillin poliomyelitis virus PR8 antiserum PR8 virus rabbit rabies virus rate of occurrence recombinant form recombination replication result rhesus monkeys sacrificed Sassari second passage spontaneous variants sterile saline strains of influenza supernate thesis third passage three serial passages tions titration unadapted undiluted viral variation virus particles yellow fever virus