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Epulopiscium fishelsoni ("guest at a fish's banquet") is a gram-positive bacterium that has a symbiotic relationship with the surgeonfish. It is most well-known for its large size, ranging from 200-700 μm in length, and about 80 μm in diameter. Until the discovery of Thiomargarita namibiensis in 1999, it was the largest bacteria known. For other uses, see Scientific classification (disambiguation). ...
Phyla Actinobacteria Aquificae Chlamydiae Bacteroidetes/Chlorobi Chloroflexi Chrysiogenetes Cyanobacteria Deferribacteres Deinococcus-Thermus Dictyoglomi Fibrobacteres/Acidobacteria Firmicutes Fusobacteria Gemmatimonadetes Lentisphaerae Nitrospirae Planctomycetes Proteobacteria Spirochaetes Thermodesulfobacteria Thermomicrobia Thermotogae Verrucomicrobia Bacteria (singular: bacterium) are unicellular microorganisms. ...
Classes Bacilli Clostridia Mollicutes The Firmicutes are a division of bacteria, most of which have Gram-positive cell wall structure. ...
Orders The Clostridia are a class of Firmicutes, including Clostridium and other similar genera. ...
Families Acidaminococcaceae Clostridiaceae Eubacteriaceae Heliobacteriaceae Lachnospiraceae Peptococcaceae Peptostreptococcaceae Syntrophomonadaceae The Clostridiales are an order of Clostridia bacterium, containing eight families. ...
In biology, binomial nomenclature is the formal method of naming species. ...
Gram-positive bacteria are those that are stained dark blue or violet by gram staining, in contrast to gram-negative bacteria, which are not affected by the stain. ...
Phyla Actinobacteria Aquificae Chlamydiae Bacteroidetes/Chlorobi Chloroflexi Chrysiogenetes Cyanobacteria Deferribacteres Deinococcus-Thermus Dictyoglomi Fibrobacteres/Acidobacteria Firmicutes Fusobacteria Gemmatimonadetes Lentisphaerae Nitrospirae Planctomycetes Proteobacteria Spirochaetes Thermodesulfobacteria Thermomicrobia Thermotogae Verrucomicrobia Bacteria (singular: bacterium) are unicellular microorganisms. ...
Common Clownfish (Amphiprion ocellaris) in their Magnificent sea anemone (Heteractis magnifica) home. ...
Genera Acanthurus Ctenochaetus Naso Paracanthurus Prionurus Zebrasoma The Acanthuridae are a family of ray-finned fish that are found in the tropics waters of the Atlantic, Indian, and Pacific oceans, especially in association with coral reefs. ...
A micrometre (American spelling: micrometer, symbol µm) is an SI unit of length equal to one millionth of a metre, or about a tenth of the size of a droplet of mist or fog. ...
Binomial name Thiomargarita namibiensis Schulz , 1999 Thiomargarita namibiensis (Sulfur pearl of Namibia) is the largest bacterium ever discovered, with a width up to 750 μm (0. ...
Discovery
Epulopiscium was first discovered in 1985 by the Israeli scientist Lev Fishelson from Tel Aviv University, inside the intestines of a brown surgeonfish. It was initially classified as a protist on the basis of its large size, until rRNA analysis by Pace, et al in 1993 confirmed that it was a member of the bacteria. (Epulopiscium can reach up to three times the length of the average paramecium.) 1985 (MCMLXXXV) was a common year starting on Tuesday of the Gregorian calendar. ...
The Engineering Faculty Boulevard The Smolarz Auditorium Tel Aviv University (TAU, ××•× ×™×‘×¨×¡×™×˜×ª תל ×ביב, ×ת×) is one of Israels major universities. ...
In anatomy, the intestine is the portion of the alimentary canal extending from the stomach to the anus and, in humans and other mammals, consists of two segments, the small intestine and the large intestine (or colon). ...
Typical phyla Chromista Heterokontophyta Haptophyta Cryptophyta (cryptomonads) Alveolata Dinoflagellata Apicomplexa Ciliophora (ciliates) Excavata Euglenozoa Percolozoa Metamonada Rhizaria Radiolaria Foraminifera Cercozoa Archaeplastida (in part) Rhodophyta (red algae) Glaucophyta (basal archaeplastids) Amoebozoa Choanozoa Many others; classification varies Protists (IPA: ) are a diverse group of organisms, comprising those eukaryotes that are not animals...
A non-coding RNA (ncRNA) is any RNA molecule that functions without being translated into a protein. ...
Species Paramecium tetraurelia Paramecium is a genus of unicellular ciliate protozoa, formerly known as slipper animalcules from their slipper shape. ...
Physiology The bacteria exhibit many unusual characteristics, mostly due to the adaptations necessary for their large size. Epulopiscium is extremely polyploid, with bacterial chromosomes representing as much as 1,000 copies of the genome throughout the cell at any given time. Since bacteria rely on diffusion rather than cytoskeletal transport as in eukaryotes, this over-expression may be necessary for proteins to disperse throughout the cell. This polyploidy is also associated with a very high efflux rate, due to the over-expression of genes for export pumps. Polyploidy refers to cells or organisms that contain more than two copies of each of their chromosomes. ...
Figure 1: A representation of a condensed eukaryotic chromosome, as seen during cell division. ...
In biology the genome of an organism is the whole hereditary information of an organism that is encoded in the DNA (or, for some viruses, RNA). ...
This article or section does not cite its references or sources. ...
Active efflux is a mechanism responsible for extrusion of toxic substances and antibiotics outside the cell. ...
Epulopiscium has a unique anatomy which is designed to overcome the size limitations inherent in cell volume. Its cell wall contains many folds in order to increase surface area, and it possesses an unusual "cortex" containing tubules, vesicles, and other structures which are usually found in eukaryotes. It may be the case that these structures are involved in intracellular transport, which would provide a unique example of convergent evolution on the cellular level. A tubule is a very small tube or fistular structure. ...
In cell biology, a vesicle is a relatively small and enclosed compartment, separated from the cytosol by at least one lipid bilayer. ...
Kingdoms Eukaryotes are organisms with complex cells, in which the genetic material is organized into membrane-bound nuclei. ...
It has been suggested that Morphological convergence be merged into this article or section. ...
While these adaptions allow the bacteria to break the theoretical upper limit for size, the underlying evolutionary reasons for the bacteria to grow to this size in the first place remain speculative. One possible reason could be the ability to avoid predation by protists. A hawk consuming its prey, a small rodent. ...
Reproduction Perhaps the most intriguing aspect of the bacteria is its unusual, almost viviparous reproductive cycle. Unlike most bacteria, which undergo binary fission, Epulopiscium reproduces exclusively through an unusual form of sporulation in which anywhere from one to twelve daughter cells are grown inside of the parent cell, until the cell eventually lyses and the new bacteria burst through the cell wall. Although sporulation is common among other bacteria (such as Bacillus subtilis), it is a desperation measure brought about by overcrowding or starvation, rather than a standard form of reproduction. Also, the daughter cells in standard sporulation are usually dormant, while new Epulopiscium cells are active. To meet Wikipedias quality standards and make it easier to understand, this article or section may require cleanup. ...
Binary fission Binary fission is the form of asexual reproduction in single-celled organisms by which one cell divides into two cells of the same size, used by most prokaryotes. ...
Sporulation is the developmental process by which a fungal cell, amoeba, bacteria or protozoan becomes a spore. ...
Binomial name Bacillus subtilis (Ehrenberg 1835) Cohn 1872 Gram-stained Bacillus subtilis Sporulating Bacillus subtilis Bacillus subtilis is a Gram-positive, catalase-positive bacterium commonly found in soil. ...
Towering over the city of Naples, Vesuvius is dormant but certainly not extinct .A dormant volcano is one which is not currently erupting, but is believed to still be capable of erupting. ...
This form of reproduction has been observed in other large gut symbionts (Metabacterium polyspora), which are phylogenetically related to Epulopiscium. Since sporulation affords bacteria much more protection from the outside environment than binary fission, it is thought that the evolution of this unusual life cycle may be in order to allow transfer of the bacteria from one host to another, and also provide protection during reproduction from the harsh environment of the digestive system.
Symbiosis Different strains of Epulopiscium have been isolated in most surgeonfish species around the world, and scientists have been unable to culture Epulopiscium outside of its natural habitat, meaning that the relationship between the two is probably mutually beneficial and symbiotic.
The daily life cycle of Epulopiscium exhibits a correlation with the daily activities of the surgeonfish. During the day, when the surgeonfish feed on algae, the bacteria's compact, spherical nucleoids migrate to the poles of the cell and begin to elongate. As the day goes on, the average length of the cells increase, until the nucleoids make up a large percentage of the parent cell volume, and the sporulation process begins in the late afternoons and evenings, when these nucleoids reach a maximum of approximately 50 - 75% of the length of the parent cells. The pH of the surgeonfish's gut also shows a correlation with the daily life cycle of the bacteria, showing that they suppress it during the day. A seaweed (Laurencia) up close: the branches are multicellular and only about 1 mm thick. ...
In prokaryotes, the nucleoid (meaning nucleus-like and also known as the nuclear region, nuclear body or chromatin body) is an irregularly shaped region within the cell where the genetic material is localised. ...
The correct title of this article is . ...
Although the exact biochemical nature of the symbiosis remains unclear, it is safe to assume that the bacteria assist the fish in breaking down algal nutrients. Many bacteria of the genus Clostridia are gut symbionts in a variety of other species, including humans, usually involved in breaking down complex carbohydrates. Human beings are defined variously in biological, spiritual, and cultural terms, or in combinations thereof. ...
Polysaccharides (sometimes called glycans) are relatively complex carbohydrates. ...
External links - Dr. Esther Angert's Epulopiscium page
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