Posttraumatic stress disorders in the Nanai after pollution of the Amur River: ethnocultural analysis.

Objectives: Chemical pollution of the Amur River has seriously damaged traditions and caused posttraumatic stress disorder (PTSD) among the Nanai, the indigenous people living along this river. This study was performed to clarify the ethnographic characteristics of PTSD in this unique population.

Methods: The study group consisted of 75 male and 112 female randomly selected volunteers.

[Variability of the clonal structure of Yersinia pseudotuberculosis population under different conditions].

In a series of experiments the dynamics of the clonal structure of Y. pseudotuberculosis population was evaluated by cytopathogenicity in soil extract, as well as in associations with blue-green algae (cyanobacteria) and infusoria, under different temperature conditions. In all variants of experiments made at low environmental temperature (10 degrees C) a considerable part of Y.

[Ultrastructure of Yersinia pseudotuberculosis in the process of their reversible transition into the dormant (non-culturable) state in association with blue-green algae].

The ultrastructural organization of Y. pseudotuberculosis in the process of the transition of vegetative cells into the dormant (noncultivable) state in interaction with blue-green algae of the species Anabaena variabilis was studied by the method of transmission electron microscopy. The use of type specific Y.

[Ecological-genetic mechanisms of the transition of Salmonella typhimurium to the dormant state in the environment].

The dynamics of vegetative and dormant (noncultivable) of S. typhimurium cells of two isogenic strains in association with microalgae Scenedesmus quadricauda and under the action of the exometabolites of the algae at different stages of their growth was studied using in parallel bacteriological method and PCR. The study revealed that at the stage of active growth green algae and their metabolic products maintain the survival of salmonellae (strain TR = 1) vegetative forms in water at an optimum temperature.

[Effect of blue-green alga (Cyanobacteria) and their exometabolites on formation of resting forms and variability of Yersinia pseudotuberculosis].

Research, carried out with the use of bacteriological methods and polymerase chain reaction, revealed that the transformation of Y. pseudotuberculosis, associated with blue-green algae Anabaena variabilis, into resting (noncultivable) forms took shorter time than in soil extract containing no algae. The exometabolites of "old" cultures of these algae sharply accelerated the formation of resting Y.