2020 Small World in Motion Competition

Oil droplets on a soap film

Karl Gaff

Location
Dublin, Ireland
Technique
Reflected Light
Magnification
4X (Objective Lens Magnification)

This movie shows lipid islands of soap floating on a very thin film of water. The film on which the soap floats is so thin that it does not interfere with the light hitting it, therefore allowing the light to pass through. This creates an appearance of a black abyss. The biggest challenge in creating a movie such as this is finding the ideal ratio between the soap and the liquid substrate, which is a precise formula of water and sugar to give it the correct viscosity. If too much sugar is used, the water will become too viscous and to remain invisible, but if not enough is used, the soap will break up too quickly.

Hydra

Frank Fox

Affiliation
Trier University of Applied Sciences
Konz, Rheinland-Pfalz, Germany
Technique
Darkfield
Magnification
10X (Objective Lens Magnification)

Frank Fox’s second honorable mention in the 2020 Small World in Motion competition shows a Hydra, an invertebrate freshwater animal that is known for being able to expand its normal size. This video shows just such behavior as the creature stretches out many times its original length. This was taken using darkfield technique and clearly demonstrates Mr. Fox’s ability to keep moving subjects in focus, a challenge for even the most accomplished microscopist.

Ciliate (Prorodon viridis) showing its beating cilia and green zoochlorellae

Ralph Grimm

Location
Jimboomba, Queensland, Australia
Technique
Differential Interference Contrast
Magnification
60X (Objective Lens Magnification)

Ralph Grimm, a prolific photomicrographer from Australia, has been in the Small World winners circle an impressive 16 times dating all the way back to 2005. His most recent entry, a differential interference contrast (DIC) movie of the ciliate Prorodon viridis showing beating cilia and green zoochlorellae perfectly demonstrates his imaging skills. DIC is a commonly used illumination technique to observe creatures such as this, but it can be immensely challenging to keep sharpness, focus and proper framing for the duration of a movie of such animals. This particular creature uses algal “solar” cells from which it derives part of its energy (long before man came up with the idea).