This article is about the microorganisms. To get the genus, see Bacterium (genus). To get other uses, see Bacteria (disambiguation). Bacterias
Temporal selection: Archean or earlier – Recent
Scanning electron micrograph of Escherichia coli bacilli
gram positive/no outer membrane layer
Tenericutes (no wall)
gram negative/outer membrane layer present
Fibrobacteres–Chlorobi/Bacteroidetes (FCB group)
Planctomycetes–Verrucomicrobia/Chlamydiae (PVC group)
Bacteria (/bækˈtɪəriə/ ( listen); singular: bacterium) are a large domain of single-celled, prokaryote microorganisms. Commonly a few micrometres in length, bacterias have a wide range of shapes, which range from spheres to rods and spirals. Bacteria are ubiquitous in every habitat on Earth, growing in soil, acidic hot suspension springs, radioactive waste materials, water, and deep in the Earth's crust, as well as in organic matter plus the live body of plants and pets. There are commonly 40 , 000, 000 bacterial cells in a gram of garden soil and a thousand bacterial skin cells in a millilitre of freshwater; in all, you will find approximately five nonillion (5×1030) bacteria on the planet, forming a biomass on Earth, which is higher than that of most plants and animals. Bacteria are essential in recycling where possible nutrients, numerous steps in nutrient cycles according to these organisms, such as the hinsicht of nitrogen from the atmosphere and putrefaction. However , the majority of bacteria never have been characterized, and only about half of the phyla of bacteria have varieties that can be produced in the lab. The study of bacterias is known as bacteriology, a branch of microbiology.
There are approximately...
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