Human sperm cell, coloured scanning electron micrograph (SEM). Magnification: x8000 when printed at 10 centimetres tall.

Scorpion fly foot, SEM

Asparagus (Asparagus officinalis) pollen grains, coloured scanning electron micrograph (SEM). Magnification: x2000 when printed at 10 centimetres wide.

Lactobacillus casei bacteria, coloured scanning electron micrograph (SEM). Magnification: x3000 when printed at 10 centimetres wide.

Scorpion fly foot, SEM

Blood cells, SEM

Quartz crystals, coloured scanning electron micrograph (SEM). This silicate mineral is a form of silica (silicon dioxide).

Streptomyces coelicoflavus bacteria. Coloured scanning electron micrograph (SEM) of strands of Streptomyces coelicoflavus bacteria. Streptomyces coelicoflavus is a filamentous soil bacterium.

Actinomyces viscosus bacteria. Coloured scanning electron micrograph (SEM) of strands of Actinomyces viscosus. Actinomyces viscosus is a filamentous soil bacterium, classified in the Actinobacteria.

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.

Osteocyte bone cell. Coloured scanning electron micrograph (SEM) of an osteocyte bone cell (blue) surrounded by bone tissue (grey). Osteocytes are osteoblasts (bone-producing cells) that have become trapped within bone cavities (lacunae, depressions...

Blood cells. Coloured scanning electron micrograph (SEM) of human red blood cells (erythrocytes, red), white blood cells (leukocytes, blue and cyan), and platelets (thrombocytes, yellow). The disc-shaped, biconcave erythrocytes transport oxygen to the...

Coloured SEM of claw of blue crab