A microorganism, or microbe, is a microscopic organism, which may exist in its single-celled form or a colony of cells.

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 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. Microorganisms also make up the microbiota found in and on all multicellular organisms. There is evidence that 3.45-billion-year-old Australian rocks once contained microorganisms, the earliest direct evidence of life on Earth.

Microbes are important in human culture and health in many ways, serving to ferment foods and treat sewage, and to produce fuel, enzymes, and other bioactive compounds. Microbes are essential tools in biology as model organisms and have been put to use in biological warfare and bioterrorism. Microbes are a vital component of fertile soil. In the human body, microorganisms make up the human microbiota, including the essential gut flora. The pathogens responsible for many infectious diseases are microbes and, as such, are the target of hygiene measures.

The possible existence of microscopic organisms was discussed for many centuries before their discovery in the seventeenth century. By the fifth century BC, the Jains of present-day India postulated the existence of tiny organisms called nigodas. These nigodas are said to be born in clusters; they live everywhere, including the bodies of plants, animals, and people; and their life lasts only for a fraction of a second. Microorganisms can be found almost anywhere on Earth. Bacteria and archaea are almost always microscopic, while a number of eukaryotes are also microscopic, including most protists, some fungi, as well as some micro-animals and plants. Viruses are generally regarded as not living and therefore not considered as microorganisms, although a subfield of microbiology is virology, the study of viruses. Microorganisms are found in almost every habitat present in nature, including hostile environments such as the North and South poles, deserts, geysers, and rocks. They also include all the marine microorganisms of the oceans and deep sea. Some types of microorganisms have adapted to extreme environments and sustained colonies; these organisms are known as extremophiles. Extremophiles have been isolated from rocks as much as 7 kilometres below the Earth's surface, and it has been suggested that the amount of organisms living below the Earth's surface is comparable with the amount of life on or above the surface. Extremophiles have been known to survive for a prolonged time in a vacuum, and can be highly resistant to radiation, which may even allow them to survive in space. Many types of microorganisms have intimate symbiotic relationships with other larger organisms; some of which are mutually beneficial, while others can be damaging to the host organism.

Applied Microbiology is a peer-reviewed Open Access Journal, encourages on-going international research and articles related to but not limited to Medical microbiology, pathogenic microbes, Pharmaceutical microbiology (antibiotics, enzymes, vitamins, vaccines) Industrial microbiology, Microbial biotechnology, Plant pathology, Veterinary, Food, Agricultural, Soil, Environmental Microbiology, etc.

It’s our privilege to recite you as a foremost strategist in the realm of research and invite to endowment your research penmanship to write (volume 7 issue 8 ) Short Communication or mini review on above topic to be published in our journal.

Applied Microbiology: Open Access follows Editorial Tracking System for quality in peer review process. Editorial Tracking is an online manuscript submission, review and tracking systems used by most of the best open access journals.

Submit manuscripts at https://www.longdom.org/editorial-tracking/index.php

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Applied Microbiology: Open Access

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