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- W2000648961 abstract "Aims: The aim of this study was to extract information on cell number and colony volume dynamics of Salmonella Typhimurium colonies. Methods and Results: Both cell number and colony volume of Salmonella Typhimurium in gelatin were monitored during the exponential and the stationary phase with varying pH and water activity, by plate counts and microscopic image analysis respectively. The exponential growth rates of cell numbers and colony volumes were correlated. The exponential growth rate of cell numbers was estimated based on this correlation and a secondary model that describes the effect of pH and water activity on the growth rate of the colony volumes. During the stationary phase, the cell number was constant, while colony volume increased, thus indicating the formation of a dead fraction. Models were developed to describe the living and dead population. Conclusions: By comparing colony volumes and cell numbers, the formation of dead fraction can be noticed from the beginning of the stationary phase, which indicates that the stationary phase is a dynamic – including both cell death and cell growth – rather than a static phase. Significance and Impact of the Study: This study was the first to investigate the proportion of living and dead bacteria within a stationary colony quantitatively." @default.
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- W2000648961 date "2009-07-01" @default.
- W2000648961 modified "2023-10-16" @default.
- W2000648961 title "Extracting information on the evolution of living- and dead-cell fractions of<i>Salmonella</i>Typhimurium colonies in gelatin gels based on microscopic images and plate-count data" @default.
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- W2000648961 doi "https://doi.org/10.1111/j.1472-765x.2009.02623.x" @default.
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