Pinterest • The world’s catalogue of ideas

Explore Micrograph Stock, Light Micrograph and more!

Diatoms are a major group of algae and one of the most common types of phytoplankton. Most diatoms are unicellular, although they can exist as colonies in the shape of filaments or ribbons, fans, zigzags, or stellate colonies. With their exquisitely beautiful silica shells, or frustules such as that of Odontella shown above at right, diatoms are among the loveliest microfossils.

SJ3630: Nerve fiber node, TEM

Nerve fiber node. Colored TEM cross-section through a nerve fiber at a node of Ranvier. The axon (blue) is surrounded by a fatty insulating sheath of myelin (green), which increases the speed of the nerve signal. ©Thomas Deerinck, NCMIR/Science Source

A cross section of a Zea stem (corn) showing vascular bundles. The staining gives each type of cell a different colour.