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 …

Dec 4, 2025 · The major groups of microorganisms—namely bacteria, archaea, fungi (yeasts and molds), algae, protozoa, and viruses—are summarized below. Links to the more detailed …

Mar 28, 2024 · In summation, a microorganism is a minuscule living entity invisible to the unaided eye. This broad classification encompasses a plethora of organisms, including bacteria, …

Aug 4, 2025 · Microorganisms—organisms too small to be seen with the naked eye—pervade every corner of the planet. They flourish in soil, water, air, and even the most extreme …

Microorganisms is a scientific, peer-reviewed, open access journal of microbiology, published monthly online by MDPI.

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 …

Microorganisms, also known as microbes, are tiny living organisms that are invisible to the naked eye. They include a diverse group of microscopic life forms such as bacteria, archaea, fungi, …

Microorganisms include both prokaryotes (i.e., archaea and bacteria), as well as some eukaryotes (e.g., certain fungi and microalgae; Acheampong et al., 2010). Microorganisms are cost-free …

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 …

Microorganisms are very small organisms that generally cannot be seen without a microscope. These tiny organisms live everywhere, including within the human body. Microorganisms may …