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t-shirts lettuce t-shirts leaf t-shirts stomata t-shirts respiration t-shirts orifices t-shirts contamination t-shirts contaminate t-shirts infection t-shirts infections t-shirts escherichia coli t-shirts e. coli t-shirts e.coli t-shirts health t-shirts hazard t-shirts health hazard t-shirts

photographs lettuce photos leaf photos stomata photos respiration photos orifices photos contamination photos contaminate photos infection photos infections photos escherichia coli photos e. coli photos e.coli photos health photos hazard photos health hazard photos

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Stoma (respiration orifice) in an Iceberg lettuce leaf that has been free of bacterial infection. Lettuce and spinach leaves contaminated with bacteria such as toxigenic Escherichia coli have been a health hazard the bacteria congregate and propagate around and in the stomata, from where they are impossible to wash out. Clean vegetable leaves are characterized by the absence of bacteria around the stomata. Enhanced SEM. Image width 36.5 micrometers; magnification 2740x if the image is printed 10 cm wide.