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microorganism : an organism (such as a bacterium or protozoan) of microscopic or ultramicroscopic size — Merriam-Webster   See also   OneLook


Microorganism, or microbe, is a microscopic organism, which may be single-celled or multicellular. Microorganisms include all unicellular organisms and so are extremely diverse. Of the three domains of life identified by Carl Woese, all of the Archaea and Bacteria are microorganisms. These were previously grouped together in the two domain system as Prokaryotes, the other being the Eukaryotes. The third domain Eukaryota includes all multicellular organisms and many unicellular protists and protozoans. Some protists are related to animals and some to green plants. Many of the multicellular organisms are microscopic, namely micro-animals, some fungi and some algae, but these are not discussed here. They live in almost every habitat from the poles to the equator, deserts, geysers, rocks and the deep sea. Some are adapted to extremes such as very hot or very cold conditions, others to high pressure and a few such as Deinococcus radiodurans to high radiation environments. Microorganisms also make up the microbiota found in and on all multicellular organisms. — Wikipedia

Microorganism (Encyclopædia Britannica)
Microorganism (Biology Online)

Life on Earth (Tree of Life)
Oirgin of Life (One Zoom)
Biota (Catalogue of Life)



Talks about Microorganisms (TED: Ideas Worth Spreading)
Articles about Microorganisms (Big Think)




Microbiology is the scientific study of microorganisms, those being unicellular (single cell), multicellular (cell colony), or acellular (lacking cells). Microbiology encompasses numerous sub-disciplines including virology, bacteriology, protistology, mycology, immunology, and parasitology. Eukaryotic microorganisms possess membrane-bound organelles and include fungi and protists, whereas prokaryotic organisms—all of which are microorganisms—are conventionally classified as lacking membrane-bound organelles and include Bacteria and Archaea. Microbiologists traditionally relied on culture, staining, and microscopy. However, less than 1% of the microorganisms present in common environments can be cultured in isolation using current means. Microbiologists often rely on molecular biology tools such as DNA sequence based identification, for example the 16S rRNA gene sequence used for bacteria identification. — Wikipedia

Microbiology (Encyclopædia Britannica)
Microbiology (Biology Online)




DDC: 579 Microbiology (Library Thing)
Subject: Microbiology (Library Thing)

Subject: Microbiology (Open Library)

LCC: QR Microbiology (UPenn Online Books)
Subject: Microbiology (UPenn Online Books)

LCC: QR Microbiology (Library of Congress)
Subject: Microbiology (Library of Congress)

Subject: Microbiology (WorldCat)




Microbiology (Ology, American Museum of Natural History)
The Littlest Organisms (Biology4Kids)

Microbial Life Resources (Science Education Resource Center, Carleton College)
In the Classroom (American Society for Microbiology)
Journal of Microbiology & Biology Education (American Society for Microbiology)

MERLOT: Multimedia Educational Resource for Learning and Online Teaching
OER Commons: Open Educational Resources


Microbiology (MIT OpenCourseWare)
Microbiology (edX)



CareerOneStop, YouTube Channel (U.S. Department of Labor, Employment and Training Administration)
CareerOneStop, Official Website (U.S. Department of Labor, Employment and Training Administration)

Microbiologists (CareerOneStop, U.S. Department of Labor, Employment and Training Administration)
Microbiologists (US Occupational Outlook Handbook)


International Union of Microbiological Societies
Microbiology Society
American Society for Microbiology


Microbiology (Microbiology Society)
Clinical Microbiology Reviews (American Society for Microbiology)
Nature Microbiology
Microbiology (Nature)
Microbiology (bioRxiv: Preprint Server for Biology, Cold Spring Harbor Laboratory)
Microorganism (EurekaAlert, American Association for the Advancement of Science)
Microbes and More News (Science Daily)
Microbes (Science News)
Microorganism (Phys.org)

Microorganisms (JSTOR)
Microbiology (JSTOR)


Division of Microbiology and Infectious Diseases (National Institutes of Health)
Microbiology Lab (National Science Foundation)


Microorganism (USA.gov)


More News …

Phys.org - latest science and technology news stories Phys.org internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine.

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    on September 29, 2023 at 9:47 am

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Microbes and More News -- ScienceDaily Current science articles on microbes and more. Read about viruses, bacteria, fungi and prions and see related videos.

  • Decreasing biodiversity may promote spread of...
    on September 27, 2023 at 4:31 am

    How are environmental changes, loss of biodiversity, and the spread of pathogens connected? The answer is a puzzle. Researchers have now described one piece of that puzzle, showing that the destruction of tropical rainforests harms the diversity of mosquito species. At the same time, more resilient species of mosquitoes become more prevalent -- which also means the viruses they carry are more abundant. If there are many individuals of a given species, those viruses can spread quickly.

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  • How climate warming could disrupt a deep-rooted...
    on September 21, 2023 at 7:44 pm

    Trees depend on fungi for their well-being. As climate change and global warming cause higher temperatures and amplified drought, little is known about how these important fungi will respond. To investigate this issue, a research team conducted a climate change experiment where they exposed boreal and temperate tree species to warming and drought treatments to better understand how fungi and their tree hosts respond to environmental changes. Their findings revealed that the combined effects of […]


Here are links to pages about closely related subjects.

Knowledge Realm

Terrestrial   (Earth)

Sphere Land, Ice, Water (Ocean), Air, Life (Cell, Gene)
Ecosystem Forest, Grassland, Desert, Arctic, Aquatic

Tree of Life
Microorganism Virus
Prokaryote Archaea, Bacteria
Eukaryote Protist, Fungi, Algae, Protozoa (Tardigrade)
Plant Flower, Tree
Cnidaria Coral, Jellyfish
Cephalopod Cuttlefish, Octopus
Crustacean Lobster, Shrimp
Arachnid Spider, Scorpion
Insect Ant, Bee, Beetle, Butterfly
Fish Seahorse, Ray, Shark
Amphibian Frog, Salamander
Reptile Turtle, Tortoise, Dinosaur
Bird Penguin, Ostrich, Owl, Crow, Parrot
Mammal Platypus, Bat, Mouse, Rabbit, Goat, Giraffe, Camel, Horse, Elephant, Mammoth
Walrus, Seal, Polar Bear, Bear, Panda, Cat, Tiger, Lion, Dog, Wolf
Cetacean Whale, Dolphin
Primate Monkey, Chimpanzee, Human


1.   The resources on this page are are organized by a classification scheme developed exclusively for Cosma.