Diatom, coloured scanning electron micrograph (SEM). The diatoms are a group of photosynthetic, single-celled algae containing about 100, 000 species. Magnification: x3250 when printed at 10 centimetres wide.

Fibroblast cell, coloured scanning electron micrograph (SEM). Fibroblasts are cells that give rise to connective tissue such as collagen, the main structural protein in the body. Magnification: x2000 when printed at 10 centimetres wide.

Diatom. Coloured scanning electron micrograph (SEM) of a Campylodiscus fastuosus diatom. The diatoms are a group of photosynthetic, single-celled algae containing about 100, 000 species. Magnification: x1000 when printed at 10 centimetres wide.

Diatom. Coloured scanning electron micrograph (SEM) of a Triceratium sp. diatom. The diatoms are a group of photosynthetic, single-celled algae containing about 100, 000 species. Magnification: x800 when printed at 10 centimetres wide.

Diatom. Coloured scanning electron micrograph (SEM) of a Eupodiscus sculptus diatom. The diatoms are a group of photosynthetic, single-celled algae containing about 100, 000 species. Magnification: x800 when printed at 10 centimetres wide.

Diatom. Coloured scanning electron micrograph (SEM) of a Rutilaria epsilon diatom. The diatoms are a group of photosynthetic, single-celled algae containing about 100, 000 species. Magnification: x1000 when printed at 10 centimetres wide.

Diatom. Coloured scanning electron micrograph (SEM) of a Bacteriastrum sp. diatom. The diatoms are a group of photosynthetic, single-celled algae containing about 100, 000 species. Magnification: x950 when printed at 10 centimetres wide.

Puffball fungus spore, coloured scanning electron micrograph (SEM). This is the reproductive cell of the fungus. Magnification: x3000 when printed at 10 centimetres wide.