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microorganism : an organism (such as a bacterium or protozoan) of microscopic or ultramicroscopic size — 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




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




Subject: Microorganism (WorldCat)




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



Zoologists and Wildlife Biologists (CareerOneStop, U.S. Department of Labor, Employment and Training Administration)


American Institute of Biological Sciences


BioScience (American Institute of Biological Sciences)
Microorganism (EurekaAlert, American Association for the Advancement of Science)
Microorganism (Phys.org)
Microorganism (Science News)
Microorganism (NPR Archives)



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.

  • Study provides insights into how microbiome...
    on November 23, 2022 at 5:48 pm

    Microorganisms play an important role in regulating plant-herbivore interactions. However, research has mainly focused on the crops and generalist insects. In the obligate pollinating systems, the cheater visitors are rare, and the role of microorganism in this system remains unknown.

  • Human evolution: Brain, gut and immune system...
    on November 23, 2022 at 4:00 pm

    A team of Duke researchers has identified a group of human DNA sequences driving changes in brain development, digestion and immunity that seem to have evolved rapidly after our family line split from that of the chimpanzees, but before we split with the Neanderthals.

  • Study reveals new method of preparing imaging...
    on November 22, 2022 at 6:55 pm

    Dr. Benjamin Rotstein and collaborators unveil an operationally simple method to prepare carbon isotope-labeled versions of drugs and diagnostics.

  • Microplankton study: Active lipids enable...
    on November 22, 2022 at 6:42 pm

    Biophysicists from the University of Luxembourg have uncovered how microplankton—key photosynthetic organisms which produce nearly 50% of the oxygen we breathe—adopt a thrifty lifestyle when nutrients turn limiting. They strategically harness internal lipids to regulate swimming properties to maximize their fitness.

  • Insights into a 'hot' microbe that can grow on...
    on November 22, 2022 at 5:25 pm

    Scientists at the Max Planck Institute for Marine Microbiology have successfully enhanced cultivation of a microorganism that can fix nitrogen (N2) while producing methane (CH4) and ammonia (NH3) and investigated exciting details of its metabolism.

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

  • Scientists reveal first close-up look at bats'...
    on November 24, 2022 at 2:35 am

    Understanding how bats tolerate viral infections without developing symptoms may lead to better ways of combating human disease.

  • Genome studies uncover a new branch in fungal...
    on November 23, 2022 at 5:51 pm

    About 600 seemingly disparate fungi that had resisted categorization have been shown to have a common ancestor, according to a a research team that used genome sequencing to give these peculiar creatures a new classification home.

  • Of mice and men: Treating acne with systemic...
    on November 22, 2022 at 8:27 pm

    Adolescence is a time of significant skeletal development. In a new report, researchers showed that long-term use of minocycline, an antibiotic used for the systemic treatment of adolescent acne, disrupts the normal gut microbiome, leading to poor bone maturation. Surprisingly, these effects were caused by a change in the gut microbiome, leading to an altered profile of bile acids -- molecules that aid digestion and communicate with many organs -- that suppressed the activity of bone-forming […]

  • Secretion secrets revealed: Pathogen effector...
    on November 22, 2022 at 5:53 pm

    A recent study has discovered and characterized secreted proteins from the pathogen Candidatus Liberibacter solanacearum. These proteins, called effectors, offer clues into the manipulation tactics this bacterium uses to subdue its plant host. The study found that these effectors can be present in both the plant and insect host.

  • World's oldest meal helps unravel mystery of our...
    on November 22, 2022 at 4:15 pm

    The contents of the last meal consumed by the earliest animals known to inhabit Earth more than 550 million years ago has unearthed new clues about the physiology of our earliest animal ancestors, according to scientists.


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.