RESUMEN
One of the objects of a nuclear plant built in 1983 and put in 15-years long dead storage with the purpose to estimate the degree of contamination by rust-hazardous microorganisms of ferroconcrete structures and to predict their biocorrosion state after putting in operation was a subject of microbiological investigation. The everywhere distribution of sulphur cycle bacteria (thionic and sulphate-reducing bacteria) on the surface and in the bulk of concrete structures, their confineness to corrosion products of concrete and bars of the investigated building have been shown. It has been demonstrated that sulphate-reducing bacteria were the most distributed group in all the sampling points. An indirect estimation of participation degree of the microbial communities in the processes of ferroconcrete biological damages has been carried out as based on the accumulation intensity of aggressive gaseous metabolites--carbon dioxide and hydrogen. Probability of deterioration of biocorrosion situation under the full-scale operation of the object has been substantiated.
Asunto(s)
Bacterias/metabolismo , Materiales de Construcción/microbiología , Corrosión , Hierro/metabolismo , Dióxido de Carbono/metabolismo , Ecosistema , Hidrógeno/metabolismo , Oxidación-Reducción , Centrales Eléctricas , Bacterias Reductoras del Azufre/crecimiento & desarrollo , Bacterias Reductoras del Azufre/metabolismo , Factores de TiempoRESUMEN
The microbial cenosis of tonsils has been studied in healthy and ailing children. It has been found out that Staphylococcus aureus and S. epidermidis, beta-hemolytic streptococcus, rarely gram-negative flora and candidae were most often isolated in the ailing children. Normal microflora of healthy children mainly included lactic acid bacteria whose level considerably decreased in ailing children that is most distinctly expressed in children with decompensated tonsillitis. To correct the disturbances in microbial cenosis during complex therapy we used lactobacteria to treat the nasopharynx with the suspension of these bacteria. Positive clinical effect with following positive results of bacteriological investigation has been obtained in all patients.