Introduction
Bacteria
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.
Specials
H5N1
The term pandemic indicates a disease that affects...
The term pandemic indicates a disease that affects...
Sanitary emergency
The modality study and the death entity...
The modality study and the death entity...
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Bacteria as Sherlock Holmes
A drop of blood, a fragment of skin or a hair found on the scene of a crime can supply a lot of interesting information...
A drop of blood, a fragment of skin or a hair found on the scene of a crime can supply a lot of interesting information...
Bio-luminescence
Many sea animals, including a lot of fish and molluscs that live in the dark in the ocean depths...
Many sea animals, including a lot of fish and molluscs that live in the dark in the ocean depths...
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Life
Small but fundamental
Protista are microscopic, mainly unicellular organisms...
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Life
Zooxanthellae
Another case of symbiosis is the one between the mollusc Tridacna...
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