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 …

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 articles on …

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 environments …

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 …

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

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, protists, and …

Microorganisms constitute a vast and diverse group of life forms that span all domains. Bacteria and archaea are prokaryotes that lack a membrane-bound nucleus. They vary in morphology, …

Microorganisms are the earliest life forms on earth, which originated 3.5 billion years ago. Microorganisms refer to tiny and invisible organisms, mainly including fungi, bacteria, viruses, …

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 be …

2 days ago · Did you know that you have trillions of tiny organisms living on and inside your body? This amazing collection of microbes – your microbiome –…