RESUMO
The possibility of transition of saprotrophic and enteropathohenic bacterial populations following the chain of naturally related habitats--fodder-animal gastrointestinal tract (GIT)-animals excrement-soil-plants and again animals with a cyclic formation--has been investigated quantitatively. All bacteria used in the experiments have been shown to successfully overcome all the mechanical, physical-chemical, and biological barriers in the food chain and to come out into the environment with a quite high number. It has been demonstrated that the same bacterial population can pass the whole cycle without additional introduction of similar populations from the outside.
Assuntos
Avena/microbiologia , Transmissão de Doença Infecciosa , Escherichia coli O157/isolamento & purificação , Fezes/microbiologia , Trato Gastrointestinal/microbiologia , Salmonella typhimurium/isolamento & purificação , Ração Animal/microbiologia , Animais , Arvicolinae , Biomassa , Bovinos , Contagem de Colônia Microbiana , Ecossistema , Escherichia coli O157/crescimento & desenvolvimento , Cadeia Alimentar , Cobaias , Salmonella typhimurium/crescimento & desenvolvimentoRESUMO
Psychophysiological parameters of 89 pilots were examined when they performed flight tasks on a trainer under normal and complicated conditions. The experiments helped to reveal a group of test subjects (11.2%) who had low capabilities and made serious errors. The results obtained suggest that psychophysiological examinations during simulated professional activity can be recommended as a method to be used for measuring adaptive and compensatory capabilities of pilots undergoing medical expertise.