2018 Small World in Motion Competition

Nitella sp. (green algae), cytoplasmic streaming

Charles B. Krebs

Charles Krebs Photography
Issaquah, Washington, USA

Brightfield, Differential Interference Contrast

5x, 10x, 40x (objective lens magnification)

Nitella is a green algae with very large cells within which active fluid motion can be observed. This flow helps with the movement of nutrients, organelles and genetic material. It was first described in 1774. The causes for this motion are complex, and while much has been learned, the phenomenon is still not fully understood.