Peritrik [hot] < UHD - 720p >

The name comes from Greek: peri (around) and trich (hair). And that’s exactly what a peritrich bacterium looks like: a microscopic creature wearing a furry coat. But these aren’t just for warmth. Those "hairs" are , long, whip-like filaments of protein that spin like tiny propellers. A Crown of Propellers In a peritrichous arrangement, flagella sprout from everywhere —the sides, the front, the back. Imagine a hot dog covered in spaghetti, or a submarine with dozens of outboard motors glued to its hull. The most famous example? E. coli , the superstar of your gut microbiome.

Peritrich: hairy, relentless, and brilliantly simple. peritrik

When you picture a bacterium, you might imagine a simple, smooth sausage-shaped cell. But look closer—really close—and you’ll see that some bacteria have traded subtlety for spectacle. Enter the peritrich . The name comes from Greek: peri (around) and trich (hair)

Here’s where it gets clever. For a long time, scientists thought all those flagella spun independently, creating chaotic, drunken swimming. But nature loves efficiency. When a peritrich bacterium wants to go somewhere (say, toward a drop of glucose), all its flagella bundle together behind the cell, spinning as one coordinated rotor. The cell shoots forward like a torpedo. This smooth, directed motion is called a The Tumble: A Genius Reset Button But how does a tiny cell with no brain decide where to go? It doesn’t. It uses a brilliant random search strategy. Those "hairs" are , long, whip-like filaments of