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The aim of this study was to observe growth of isolated single bacterial cells in the absence of growth factors and intercellular contact. In order to exclude stochastic uncertainties induced by dilution series, a new micromanipulation method was developed to ensure explicit results under visual control. This was performed with particular care for production of single prokaryotic cells and subsequent investigation of their autonomous growth. Over 450 single isolated Listeria monocytogenes and Salmonella enterica subsp. enterica serovar Typhimurium cells in lag, log, and stationary growth phases were investigated by this method, which included thoroughly washing the cells. The proportion of living cells within the initial cultures was compared to the proportion of positive samples after enrichment of the separated single cells. This resulted in P values of &gt;/=0.05 using the chi-square test for statistical analysis, indicating no significant difference, and clearly demonstrates reproduction of isolated single bacterial cells without the need for growth factors or intercellular contact. Ease of handling of the apparatus and good performance of the cleaning procedures were achieved, as was validation of the method, demonstrating its suitability for routine laboratory use.

applied and environmental microbiology

Autonomous Growth of Isolated Single <i>Listeria monocytogenes</i> and <i>Salmonella enterica</i> Serovar Typhimurium Cells in the Absence of Growth Factors and Intercellular Contact

Autonomous Growth of Isolated Single Listeria monocytogenes and Salmonella enterica Serovar Typhimurium Cells in the Absence of Growth Factors and Intercellular Contact