Tomas Kral
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A cross section of a bundle of nerve fibers. Axons (orange) are wrapped in myelin (purple); an extension of the membrane of glial cells. Colored SEM.

A cross section of a bundle of nerve fibers. Axons (orange) are wrapped in myelin (purple); an extension of the membrane of glial cells. Myelin has high lipid content, and acts to insulate the axons, causing them to transmit nerve impulses much faster.

Scanning electron micrograph of a T4 bacteriophage. Viruses infect every known organism on Earth; these peculiar bug-like ones infect bacteria.

Scanning electron micrograph of a bacteriophage. Viruses infect every known organism on Earth; these peculiar bug-like ones infect bacteria. viruses are alien space pods)

In yellow, bacterial plaque on the surface of a tooth. The acid produced as waste during bacterias' digestive process demineralises the tooth creating cavities that will need fillings or may lead to tooth lost.

Stuck on the surface: This magnified image shows a blue carpet of spherical bacteria and red blood cells clinging to the surface of the yellow tooth

Figs, Fig

The hydrothermal worm is so tiny it requires a powerful microscope to see it. The organism, only slightly larger than a bacterium, lives in deep sea near hydrothermal vents that spew hot water from beneath the Earth’s crust. Photo: Phillippe Crassous

The hydrothermal worm is so tiny it requires a powerful microscope to see it. The organism, only slightly larger than a bacterium, lives in deep sea near hydrothermal vents that spew hot water from beneath the Earth’s crust. Photo by Phillippe Crassous.