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Microbes On Boy’s Handprint After Playing Outside

Tasha Sturm, a lab technician at Cabrillo College in California, has created an extraordinary set of images that illustrate the diverse world of microbes that lives on our skin. This colorful petri dish is full of bacteria, yeast and fungi that were found on her 8-year-old son’s hand after he finished playing outside.


The varying visible structures of these bacterial colonies reflect their microscopic characteristics. Microbes with and without protective membranes or flagella (which allow them to swim) will all create colonies of different colors, shapes, textures and sizes.

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Sturm explained the process on Microbe World, where she posted the images. She used tryptic soy agar, which forms a nutritious jelly perfect for growing microbial cultures. After her son pressed his hand gently into the gel, she incubated it and let the bacteria flourish for a few days. Though the resulting petri dish should be treated as a biohazard, it should also be noted that having bacteria on your hands and skin is normal. Exposure to safe amounts and types of bacteria ensures a healthy ‘microbiome,’ immune system and digestive tract.

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via boredpanda