Microorganisms (also called microbes) are organisms which share the property of being sub-microscopic. Most do not normally cause disease in humans, existing in a state of commensalism, where there is little or no benefit to the person, or mutualism, where there is some benefit to both parties.
Microorganisms is a scientific, peer-reviewed, open access journal of microbiology, published monthly online by MDPI.
A microorganism, or microbe, [a] is an organism of microscopic size, which may exist in its single-celled form or as a colony of cells. The possible existence of unseen microbial life was suspected from antiquity, with an early attestation in Jain literature authored in 6th-century BC India.
The major groups of microorganisms—namely bacteria, archaea, fungi (yeasts and molds), algae, protozoa, and viruses—are summarized below. Links to the more detailed articles on each of the major groups are provided.
Microorganisms differ from each other not only in size, but also in structure, habitat, metabolism, and many other characteristics. While we typically think of microorganisms as being unicellular, there are also many multicellular organisms that are too small to be seen without a microscope.
Microbes, which are also called micro-organisms, are a group of organisms that are too small to be seen with the naked eye. Despite being even smaller than the human cell, microbes still vary dramatically in size, with most viruses being up to 100 times smaller than the average bacterium.
Microorganisms are often illustrated using single-celled, or unicellular organisms; however, some unicellular protists are visible to the naked eye, and some multicellular species are microscopic.
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