Stalked bacteria of the genus Caulobacter from stagnant tap water. The bacteria develop the stalk (which is attached to a particle or biofilm) during starvation (phosphate limitation). Its length grows with the the age of the cell. The stalk of the cell in the middle is more than 100 Ám long (Picture: 100x obj., 10x eyepiece, phase contrast after staining with methylene blue)

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