RESUMEN
New high-strength corrosion-resistant steel based on ageing martensite, metastable and stable austenite intended for the production of medical instruments for different purposes are considered. There are data on changing mechanical properties of corrosion-resistant steel and their dependence on thermoplastic treatment condition.
Asunto(s)
Equipos y Suministros , Acero Inoxidable , Corrosión , Aleaciones Dentales , Modelos Teóricos , Níquel , TitanioRESUMEN
The possibility of changing the fatty acid composition of lipids in E. coli strain BB 20-14 by the introduction of ready lipid vesicles obtained from other E. coli strains into the growth medium has been established. Using E. coli strain BB 20-14 as an example, the dependence of the viability of bacteria on their fatty acid composition has been demonstrated.
Asunto(s)
Microbiología del Aire , Escherichia coli/fisiología , Medios de Cultivo/metabolismo , Escherichia coli/análisis , Ácidos Grasos/análisis , Glicerofosfatos/metabolismo , Lípidos de la Membrana/análisis , Lípidos de la Membrana/metabolismoRESUMEN
The death of aerosolized bacteria has been shown to occur as the result of irreversible conformation changes in their macromolecules. This process depends on the role of cell dehydration and the amount of hydration water remaining in the cells.
Asunto(s)
Desecación , Escherichia coli/fisiología , Humedad , Aerosoles , Fenómenos Biofísicos , Biofisica , Sustancias Macromoleculares , Conformación Molecular , beta-Galactosidasa/metabolismoRESUMEN
Comparative experiments on auxotrophic E. coli grown in rich nutrient L-broth have demonstrated that the influence of genes psd 2 and gps A 20 responsible for the synthesis of phospholipids in the bacterial membranes on the viability of the cells is unessential. The cultivation of strain BB 20-14 in a minimal E medium with different glycerophosphate admixtures has shown that the decrease of phospholipid content in the cells to one-third of the original level leads to a considerable change in the viability of the cells in the air.
Asunto(s)
Microbiología del Aire , Escherichia coli/genética , Genes Bacterianos , Genes Letales , Aerosoles , Genotipo , Lípidos de la Membrana/genética , Mutación , Fosfolípidos/genética , TemperaturaRESUMEN
The study of the spectrum of the main fractions of proteins contained in the outer membrane of E. coli strains has revealed the relationship between the composition of protein fractions in the outer membrane and the level of the survival of these bacteria in the air. The increased survival capacity of E. coli strain K12 after the transfer of pSA 50 plasmid has been found to correlate with the appearance of 2 molecular fractions in the outer membrane. The positions of these fractions correspond to the molecular weights 70,000 daltons and 80,000 daltons.