Contents 1 Discovery 1.1 Ancient precursors 1.2 Early modern 1.3 19th century 2 Classification and structure 2.1 Evolution 2.2 Archaea 2.3 Bacteria 2.4 Eukaryotes 2.4.1 Protists 2.4.2 Fungi 2.4.3 Plants 3 Ecology 3.1 Extremophiles 3.2 In soil 3.3 Symbiosis 4 Applications 4.1 Food production 4.2 Water treatment 4.3 Energy 4.4 Chemicals, enzymes 4.5 Science 4.6 Warfare 4.7 Soil 5 Human health 5.1 Human gut flora 5.2 Disease 5.3 Hygiene 6 See also 7 Notes 8 References 9 External links

Discovery[edit] See also: History of biology and Microbiology § History Antonie van Leeuwenhoek was the first to study microorganisms, using simple microscopes of his own design. Lazzaro Spallanzani showed that boiling a broth stopped it from decaying. Ancient precursors[edit] The possible existence of microorganisms was discussed for many centuries before their discovery in the 17th century. The existence of unseen microbial life was postulated by Jainism. In the 6th century BC, Mahavira asserted the existence of unseen microbiological creatures living in earth, water, air and fire.[3] The Jain scriptures also describe nigodas, as sub-microscopic creatures living in large clusters and having a very short life, which were said to pervade every part of the universe, even the tissues of plants and animals.[4] The earliest known idea to indicate the possibility of diseases spreading by yet unseen organisms was that of the Roman scholar Marcus Terentius Varro in a 1st century BC book titled On Agriculture in which he called the unseen creatures animalcules, and warns against locating a homestead near a swamp:[5] … and because there are bred certain minute creatures that cannot be seen by the eyes, which float in the air and enter the body through the mouth and nose and they cause serious diseases.[5] In The Canon of Medicine (1020), Avicenna suggested that tuberculosis and other diseases might be contagious.[6][7] Early modern[edit] In 1546, Girolamo Fracastoro proposed that epidemic diseases were caused by transferable seedlike entities that could transmit infection by direct or indirect contact, or even without contact over long distances.[8] Antonie Van Leeuwenhoek is considered to be the father of microbiology. He was the first in 1673 to discover, observe, describe, study and conduct scientific experiments with microoorganisms, using simple single-lensed microscopes of his own design.[9][10][11][12] Robert Hooke, a contemporary of Leeuwenhoek, also used microscopy to observe microbial life in the form of the fruiting bodies of moulds. In his 1665 book Micrographia, he made drawings of studies, and he coined the term cell.[13] 19th century[edit] Louis Pasteur showed that Spallanzani's findings held even if air could enter through a filter that kept particles out. Robert Koch showed that microorganisms caused disease. Louis Pasteur (1822–1895) exposed boiled broths to the air, in vessels that contained a filter to prevent particles from passing through to the growth medium, and also in vessels without a filter, but with air allowed in via a curved tube so dust particles would settle and not come in contact with the broth. By boiling the broth beforehand, Pasteur ensured that no microorganisms survived within the broths at the beginning of his experiment. Nothing grew in the broths in the course of Pasteur's experiment. This meant that the living organisms that grew in such broths came from outside, as spores on dust, rather than spontaneously generated within the broth. Thus, Pasteur dealt the death blow to the theory of spontaneous generation and supported the germ theory of disease.[14] In 1876, Robert Koch (1843–1910) established that microorganisms can cause disease. He found that the blood of cattle which were infected with anthrax always had large numbers of Bacillus anthracis. Koch found that he could transmit anthrax from one animal to another by taking a small sample of blood from the infected animal and injecting it into a healthy one, and this caused the healthy animal to become sick. He also found that he could grow the bacteria in a nutrient broth, then inject it into a healthy animal, and cause illness. Based on these experiments, he devised criteria for establishing a causal link between a microorganism and a disease and these are now known as Koch's postulates.[15] Although these postulates cannot be applied in all cases, they do retain historical importance to the development of scientific thought and are still being used today.[16] The discovery of microorganisms such as Euglena that did not fit into either the animal or plant kingdoms, since they were photosynthetic like plants, but motile like animals, led to the naming of a third kingdom in the 1860s. In 1860 John Hogg called this the Protoctista, and in 1866 Ernst Haeckel named it the Protista.[17][18][19] The work of Pasteur and Koch did not accurately reflect the true diversity of the microbial world because of their exclusive focus on microorganisms having direct medical relevance. It was not until the work of Martinus Beijerinck and Sergei Winogradsky late in the 19th century that the true breadth of microbiology was revealed.[20] Beijerinck made two major contributions to microbiology: the discovery of viruses and the development of enrichment culture techniques.[21] While his work on the Tobacco Mosaic Virus established the basic principles of virology, it was his development of enrichment culturing that had the most immediate impact on microbiology by allowing for the cultivation of a wide range of microbes with wildly different physiologies. Winogradsky was the first to develop the concept of chemolithotrophy and to thereby reveal the essential role played by microorganisms in geochemical processes.[22] He was responsible for the first isolation and description of both nitrifying and nitrogen-fixing bacteria.[20] French-Canadian microbiologist Felix d'Herelle co-discovered bacteriophages and was one of the earliest applied microbiologists.[23]

Classification and structure[edit] 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.[24][25][26] Evolution[edit] Further information: Timeline of evolution and Earliest known life forms Carl Woese's 1990 phylogenetic tree based on rRNA data shows the domains of Bacteria, Archaea, and Eukaryota. All are microorganisms except some eukaryote groups. Single-celled microorganisms were the first forms of life to develop on Earth, approximately 3–4 billion years ago.[27][28][29] Further evolution was slow,[30] and for about 3 billion years in the Precambrian eon, (much of the history of life on Earth), all organisms were microorganisms.[31][32] Bacteria, algae and fungi have been identified in amber that is 220 million years old, which shows that the morphology of microorganisms has changed little since the Triassic period.[33] The newly discovered biological role played by nickel, however — especially that brought about by volcanic eruptions from the Siberian Traps — may have accelerated the evolution of methanogens towards the end of the Permian–Triassic extinction event.[34] Microorganisms tend to have a relatively fast rate of evolution. Most microorganisms can reproduce rapidly, and bacteria are also able to freely exchange genes through conjugation, transformation and transduction, even between widely divergent species.[35] This horizontal gene transfer, coupled with a high mutation rate and other means of transformation, allows microorganisms to swiftly evolve (via natural selection) to survive in new environments and respond to environmental stresses. This rapid evolution is important in medicine, as it has led to the development of multidrug resistant pathogenic bacteria, superbugs, that are resistant to antibiotics.[36] A possible transitional form of microorganism between a prokaryote and a eukaryote was discovered in 2012 by Japanese scientists. Parakaryon myojinensis is a unique microorganism larger than a typical prokaryote, but with nuclear material enclosed in a membrane as in a eukaryote, and the presence of endosymbionts. This is seen to be the first plausible evolutionary form of microorganism, showing a stage of development from the prokaryote to the eukaryote.[37][38] Archaea[edit] Main article: Archaea Further information: Prokaryote Archaea are prokaryotic unicellular organisms, and form the first domain of life, in Carl Woese's three-domain system. A prokaryote is defined as having no cell nucleus or other membrane bound-organelle. Archaea share this defining feature with the bacteria with which they were once grouped. In 1990 the microbiologist Woese proposed the three-domain system that divided living things into bacteria, archaea and eukaryotes,[39] and thereby split the prokaryote domain. Archaea differ from bacteria in both their genetics and biochemistry. For example, while bacterial cell membranes are made from phosphoglycerides with ester bonds, archaean membranes are made of ether lipids.[40] Archaea were originally described as extremophiles living in extreme environments, such as hot springs, but have since been found in all types of habitats.[41] Only now are scientists beginning to realize how common archaea are in the environment, with Crenarchaeota being the most common form of life in the ocean, dominating ecosystems below 150 m in depth.[42][43] These organisms are also common in soil and play a vital role in ammonia oxidation.[44] The combined domains of archaea and bacteria make up the most diverse and abundant group of organisms on Earth and inhabit practically all environments where the temperature is below +140 °C. They are found in water, soil, air, as the microbiome of an organism, hot springs and even deep beneath the Earth's crust in rocks.[45] The number of prokaryotes is estimated to be around five million trillion trillion, or 5 × 1030, accounting for at least half the biomass on Earth.[46] The biodiversity of the prokaryotes is unknown, but may be very large. A May 2016 estimate, based on laws of scaling from known numbers of species against the size of organism, gives an estimate of perhaps 1 trillion species on the planet, of which most would be microorganisms. Currently, only one-thousandth of one percent of that total have been described.[47] Bacteria[edit] Main article: Bacteria Staphylococcus aureus bacteria magnified about 10,000x Bacteria like archaea are prokaryotic – unicellular, and having no cell nucleus or other membrane-bound organelle. Bacteria are microscopic, with a few extremely rare exceptions, such as Thiomargarita namibiensis.[48] Bacteria function and reproduce as individual cells, but they can often aggregate in multicellular colonies.[49] Some species such as myxobacteria can aggregate into complex swarming structures, operating as multicellular groups as part of their life cycle,[50] or form clusters in bacterial colonies such as E.coli. Their genome is usually a circular bacterial chromosome – a single loop of DNA, although they can also harbor small pieces of DNA called plasmids. These plasmids can be transferred between cells through bacterial conjugation. Bacteria have an enclosing cell wall, which provides strength and rigidity to their cells. They reproduce by binary fission or sometimes by budding, but do not undergo meiotic sexual reproduction. However, many bacterial species can transfer DNA between individual cells by a horizontal gene transfer process referred to as natural transformation.[51] Some species form extraordinarily resilient spores, but for bacteria this is a mechanism for survival, not reproduction. Under optimal conditions bacteria can grow extremely rapidly and their numbers can double as quickly as every 20 minutes.[52] Eukaryotes[edit] Main article: Eukaryote Most living things that are visible to the naked eye in their adult form are eukaryotes, including humans. However, a large number of eukaryotes are also microorganisms. Unlike bacteria and archaea, eukaryotes contain organelles such as the cell nucleus, the Golgi apparatus and mitochondria in their cells. The nucleus is an organelle that houses the DNA that makes up a cell's genome. DNA (Deoxyribonuclaic acid) itself is arranged in complex chromosomes.[53] Mitochondria are organelles vital in metabolism as they are the site of the citric acid cycle and oxidative phosphorylation. They evolved from symbiotic bacteria and retain a remnant genome.[54] Like bacteria, plant cells have cell walls, and contain organelles such as chloroplasts in addition to the organelles in other eukaryotes. Chloroplasts produce energy from light by photosynthesis, and were also originally symbiotic bacteria.[54] Unicellular eukaryotes consist of a single cell throughout their life cycle. This qualification is significant since most multicellular eukaryotes consist of a single cell called a zygote only at the beginning of their life cycles. Microbial eukaryotes can be either haploid or diploid, and some organisms have multiple cell nuclei.[55] Unicellular eukaryotes usually reproduce asexually by mitosis under favorable conditions. However, under stressful conditions such as nutrient limitations and other conditions associated with DNA damage, they tend to reproduce sexually by meiosis and syngamy.[56] Protists[edit] Euglena mutabilis, a photosynthetic flagellate Main article: Protista Of eukaryotic groups, the protists are most commonly unicellular and microscopic. This is a highly diverse group of organisms that are not easy to classify.[57][58] Several algae species are multicellular protists, and slime molds have unique life cycles that involve switching between unicellular, colonial, and multicellular forms.[59] The number of species of protists is unknown since only a small proportion has been identified. Protist diversity is high in oceans, deep sea-vents, river sediment and an acidic river, suggesting that many eukaryotic microbial communities may yet be discovered.[60][61] Fungi[edit] Main article: Fungus The fungi have several unicellular species, such as baker's yeast (Saccharomyces cerevisiae) and fission yeast (Schizosaccharomyces pombe). Some fungi, such as the pathogenic yeast Candida albicans, can undergo phenotypic switching and grow as single cells in some environments, and filamentous hyphae in others.[62] Plants[edit] Main article: Plant The green algae are a large group of photosynthetic eukaryotes that include many microscopic organisms. Although some green algae are classified as protists, others such as charophyta are classified with embryophyte plants, which are the most familiar group of land plants. Algae can grow as single cells, or in long chains of cells. The green algae include unicellular and colonial flagellates, usually but not always with two flagella per cell, as well as various colonial, coccoid, and filamentous forms. In the Charales, which are the algae most closely related to higher plants, cells differentiate into several distinct tissues within the organism. There are about 6000 species of green algae.[63]

Ecology[edit] Main article: Microbial ecology 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,[64] 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.[45] 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.[65] Many types of microorganisms have intimate symbiotic relationships with other larger organisms; some of which are mutually beneficial (mutualism), while others can be damaging to the host organism (parasitism). If microorganisms can cause disease in a host they are known as pathogens and then they are sometimes referred to as microbes. Microorganisms play critical roles in Earth's biogeochemical cycles as they are responsible for decomposition and nitrogen fixation.[66] Bacteria use regulatory networks that allow them to adapt to almost every environmental niche on earth.[67][68] A network of interactions among diverse types of molecules including DNA, RNA, proteins and metabolites, is utilised by the bacteria to achieve regulation of gene expression. In bacteria, the principal function of regulatory networks is to control the response to environmental changes, for example nutritional status and environmental stress.[69] A complex organization of networks permits the microorganism to coordinate and integrate multiple environmental signals.[67] Extremophiles[edit] A tetrad of Deinococcus radiodurans, a radioresistant extremophile bacterium Main article: Extremophile Further information: List of microorganisms tested in outer space Extremophiles are microorganisms that have adapted so that they can survive and even thrive in extreme environments that are normally fatal to most life-forms. Thermophiles and hyperthermophiles thrive in high temperatures. Psychrophiles thrive in extremely low temperatures. – Temperatures as high as 130 °C (266 °F),[70] as low as −17 °C (1 °F)[71] Halophiles thrive in high salt conditions, up to saturation.[72] Alkaliphiles thrive in an alkaline pH of about 8.5–11.[73] Acidophiles can thrive in a pH of 2.0 or less.[74] Piezophiles thrive at very high pressures: up to 1,000-2,000 atm, down to 0 atm as in a vacuum of space.[75] A few extremophiles such as Deinococcus radiodurans are radioresistant,[76] resisting radiation exposure of up to 5k Gy. Extremophiles are significant in different ways. They extend terrestrial life into much of the Earth's hydrosphere, crust and atmosphere, their specific evolutionary adaptation mechanisms to their extreme environment can be exploited in biotechnology, and their very existence under such extreme conditions increases the potential for extraterrestrial life.[77] In soil[edit] Main article: Soil biology The nitrogen cycle in soils depends on the fixation of atmospheric nitrogen. This is achieved by a number of diazotrophs. One way this can occur is in the nodules in the roots of legumes that contain symbiotic bacteria of the genera Rhizobium, Mesorhizobium, Sinorhizobium, Bradyrhizobium, and Azorhizobium.[78] Symbiosis[edit] The photosynthetic cyanobacterium Hyella caespitosa (round shapes) with fungal hyphae (translucent threads) in the lichen Pyrenocollema halodytes A lichen is a symbiosis of a macroscopic fungus with photosynthetic microbial algae or cyanobacteria.[79][80]

Applications[edit] Main article: Microbes in human culture Microorganisms are useful in producing foods, treating waste water, creating biofuels and a wide range of chemicals and enzymes. They are invaluable in research as model organisms. They have been weaponised and sometimes used in warfare and bioterrorism. They are vital to agriculture through their roles in maintaining soil fertility and in decomposing organic matter.[81] Food production[edit] Main articles: Fermentation in food processing and Food microbiology Microorganisms are used in a fermentation process to make yoghurt, cheese, curd, kefir, ayran, xynogala, and other types of food. Fermentation cultures provide flavor and aroma, and inhibit undesirable organisms.[82] They are used to leaven bread, and to convert sugars to alcohol in wine and beer. Microorganisms are used in brewing, wine making, baking, pickling and other food-making processes.[83] Water treatment[edit] Wastewater treatment plants rely largely on microorganisms to oxidise organic matter. Main article: Wastewater treatment Sewage treatment works depend for their ability to clean up water contaminated with organic material on microorganisms that can respire dissolved substances. Respiration may be aerobic, with a well-oxygenated filter bed such as a slow sand filter.[84] Anaerobic digestion by methanogens generate useful methane gas as a by-product.[85] Energy[edit] Main articles: Algae fuel, Cellulosic ethanol, and Ethanol fermentation Microorganisms are used in fermentation to produce ethanol,[86] and in biogas reactors to produce methane.[87] Scientists are researching the use of algae to produce liquid fuels,[88] and bacteria to convert various forms of agricultural and urban waste into usable fuels.[89] Chemicals, enzymes[edit] Microorganisms are used to produce many commercial and industrial chemicals, enzymes and other bioactive molecules. Organic acids produced on a large industrial scale by microbial fermentation include acetic acid produced by acetic acid bacteria such as Acetobacter aceti, butyric acid made by the bacterium Clostridium butyricum, lactic acid made by Lactobacillus and other lactic acid bacteria,[90] and citric acid produced by the mould fungus Aspergillus niger.[90] Microorganisms are used to prepare bioactive molecules such as Streptokinase from the bacterium Streptococcus,[91] Cyclosporin A from the ascomycete fungus Tolypocladium inflatum,[92] and statins produced by the yeast Monascus purpureus.[93] Science[edit] A laboratory fermentation vessel Microorganisms are essential tools in biotechnology, biochemistry, genetics, and molecular biology. The yeasts Saccharomyces cerevisiae, and Schizosaccharomyces pombe are important model organisms in science, since they are simple eukaryotes that can be grown rapidly in large numbers and are easily manipulated.[94] They are particularly valuable in genetics, genomics and proteomics.[95][96] Microorganisms can be harnessed for uses such as creating steroids and treating skin diseases. Scientists are also considering using microorganisms for living fuel cells,[97] and as a solution for pollution.[98] Warfare[edit] Main articles: Biological warfare and Bioterrorism In the Middle Ages, as an early example of biological warfare, diseased corpses were thrown into castles during sieges using catapults or other siege engines. Individuals near the corpses were exposed to the pathogen and were likely to spread that pathogen to others.[99] In modern times, bioterrorism has included the 1984 Rajneeshee bioterror attack[100] and the 1993 release of anthrax by Aum Shinrikyo in Tokyo.[101] Soil[edit] Main article: Soil microbiology Microbes can make nutrients and minerals in the soil available to plants, produce hormones that spur growth, stimulate the plant immune system and trigger or dampen stress responses. In general a more diverse set of soil microbes results in fewer plant diseases and higher yield.[102]

Human health[edit] Human gut flora[edit] Further information: Human microbiota and Human Microbiome Project Microorganisms can form an endosymbiotic relationship with other, larger organisms. For example, microbial symbiosis plays a crucial role in the immune system. The microorganisms that make up the gut flora in the gastrointestinal tract contribute to gut immunity, synthesize vitamins such as folic acid and biotin, and ferment complex indigestible carbohydrates.[103] Some microorganisms that are seen to be beneficial to health are termed probiotics and are available as dietary supplements, or food additives.[104] Disease[edit] The eukaryotic parasite Plasmodium falciparum (spiky blue shapes), a causative agent of malaria, in human blood Main articles: Pathogen and Germ theory of disease Further information: Medical microbiology Microorganisms are the causative agents (pathogens) in many infectious diseases. The organisms involved include pathogenic bacteria, causing diseases such as plague, tuberculosis and anthrax; protozoa, causing diseases such as malaria, sleeping sickness, dysentery and toxoplasmosis; and also fungi causing diseases such as ringworm, candidiasis or histoplasmosis. However, other diseases such as influenza, yellow fever or AIDS are caused by pathogenic viruses, which are not usually classified as living organisms and are not, therefore, microorganisms by the strict definition. No clear examples of archaean pathogens are known,[105] although a relationship has been proposed between the presence of some archaean methanogens and human periodontal disease.[106] Hygiene[edit] Main articles: Hygiene and Food microbiology Hygiene is a set of practices to avoid infection or food spoilage by eliminating microorganisms from the surroundings. As microorganisms, in particular bacteria, are found virtually everywhere, harmful microorganisms may be reduced to acceptable levels rather than actually eliminated. In food preparation, microorganisms are reduced by preservation methods such as cooking, cleanliness of utensils, short storage periods, or by low temperatures. If complete sterility is needed, as with surgical equipment, an autoclave is used to kill microorganisms with heat and pressure.[107][108]

See also[edit] Catalogue of Life Microbiological culture Impedance microbiology Microbial biogeography Microbial intelligence Microbivory, an eating behavior of some animals feeding on living microbes Nanobacterium Nylon-eating bacteria Petri dish Staining

Notes[edit] ^ The word microorganism (/ˌmaɪkroʊˈɔːrɡənɪzəm/) uses combining forms of micro- (from the Greek: μικρός, mikros, "small") and organism from the Greek: ὀργανισμός, organismós, "organism"). It is usually styled solid but is sometimes hyphenated (micro-organism), especially in older texts. The informal synonym microbe (/ˈmaɪkroʊb/) comes from μικρός, mikrós, "small" and βίος, bíos, "life".

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