Picture of staphylococci, the bacteria which can cause acne. The scale of the image is indicated by the line at top left, which is 5 micrometres long. |
Picture of Trypanosoma, the protozoan organism responsible for sleeping sickness. The organism is lying next to a saucer-shaped red blood cell to give an idea of the scale. |
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Picture of Leishmania, the protozoan organism that causes kalaazar. The organisms are oval-shaped, and each has one long whip-like structure. One organism (arrow) is dividing, while a cell of the immune system (lower right) has gripped on the two whips of the dividing organism and is sending cell processes up to eat up the organism. The immune cell is about ten micrometres in diameter. |
Picture of an adult roundworm (Ascaris lumbricoides is the technical name) from the small intestine. The ruler next to it shows four centimetres to give us an idea of the scale. |
Picture of SARS viruses coming out of the surface of an infected cell. The white scale line represents 500 nanometres, which is half a micrometre, which is onethousandth of a millimetre. The scale line gives us an idea of how small the things we are looking at are |