Microscope images of bacteria.
Bacteria is a vast group of unicellular microorganisms, characterized by the absence of cell nucleus surrounded by a shell. Organisms with this structure of cells are called prokaryotes - "pre nuclear" as distinct from all other eukaryotes - "true nuclear", DNA, which is located in the nucleus surrounded by a shell. Bacteria, previously considered to be microscopic plants, are now a separate kingdom one of five in the current classification system, along with plants, animals, fungi and protists.

Microscope images of bifidibacterium

Microscope images of Corynebacterium

Microscope images of Gonococci

Microscope images of Leptothrix

Microscope images of Mobiluncus

The bacteria is much smaller than the cells of multicellular plants or animals. An average bacteria is typically 0,5-2,0 micron thick and 1,0-8,0 microns in length. Some forms of bacteria can only be barely seen under a standard light microscope (about 0.3 micrometers), but there are some species reaching more than 10 microns in length and width, the number of very thin bacteria may be longer than 50 microns. There are the following groups of bacteria classified according to the morphology: cocci (more or less spherical), bacilli (sticks or cylinders with rounded ends), spirillum (tight spiral) and spirochaete (thin and flexible hair-like forms). Some scientists tend to combine the last two groups in one - spirillum.

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