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Bacteria are unicellular organisms, in other words they are made of a single cell. Bacteria were the first organisms that lived on the Earth. They appeared 3 billion years ago in the waters of the first oceans. Bacteria or prokaryotes are the most widespread living beings in the Earth: in a spoonful of soil, for example, it is possible to find up to 10,000 billion bacteria. Their size is extremely small, in fact most bacteria cells have a diameter that ranges from 1 to 10 microns (one micron is equivalent to one thousandth of a millimetre): a line of one thousand neatly arranged bacteria, would be only one millimetre long.

subjects dealt with in Bacteria

Bacteria knowledge

Bacteria or prokaryotes are the most common living beings on Earth: one spoonful of soil can contain, for instance, up…

Man and bacteria

The first scientist to have studied and described bacteria was Anton van Leeuwenhoek (1632-1723). He was a textile dealer who…

Environment

A group of American scientists have succeeded to create some genetically modified organisms that can produce oil. The most popular…

Protection of water and soil

Pseudomonas are aerobic, rod-shaped bacteria. They can use over one hundred organic compounds as a source of energy and carbon.…

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