FACTOID # 15: A mere 0.8% of West Virginians were born in a foreign country.
 
 Home   Encyclopedia   Statistics   States A-Z   Flags   Maps   FAQ   About 
 
WHAT'S NEW
RELATED ARTICLES
People who viewed "Amoeba" also viewed:
 

SEARCH ALL

FACTS & STATISTICS    Advanced view

Search encyclopedia, statistics and forums:

 

 

(* = Graphable)

 

 


Encyclopedia > Amoeba
Amoeba

Scientific classification
Domain: Eukaryota
Kingdom: Protista
Phylum: Sarcodina
Class: Tubulinida
Family: Amoebidae
Genus: Amoeba
Bory de Saint-Vincent, 1822
Species

Amoeba proteus
Amoeba dubia Amoeba is a genus of protozoa, a type of single-celled organism. ... Chaos diffluens, an amoeba. ... For other uses, see Scientific classification (disambiguation). ... Kingdoms Eukaryotes are organisms with complex cells, in which the genetic material is organized into membrane-bound nuclei. ... Typical phyla Rhodophyta (red algae) Chromista Heterokontophyta (heterokonts) Haptophyta Cryptophyta (cryptomonads) Alveolates Pyrrhophyta (dinoflagellates) Apicomplexa Ciliophora (ciliates) Excavates Euglenozoa Percolozoa Metamonada Rhizaria Radiolaria Foraminifera Cercozoa Amoebozoa Choanozoa Many others; classification varies The Kingdom Protista or Protoctista is one of the commonly recognized biological kingdoms, including all the eukaryotes except for... Amoeba (Chaos diffluens) Foraminiferan shells Heliozoan (Actinophrys sol) Amoeboids are cells that move or feed by means of temporary projections, called pseudopods (false feet). ... Genera Amoeba Chaos Deuteramoeba Hydramoeba Metachaos Parachaos Polychaos Trichamoeba The Amoebidae are a family of amoebozoa, including naked amoebae that produce multiple pseudopodia of indeterminate length. ... Binomial name Amoeba proteus, previously Chaos diffluens, is an amoeba closely related to the giant amoebae. ... The Amoeba dubia is the largest species of the genus Amoebozoa, more commonly referred to as Amoeba. ...

Amoeba (sometimes amœba or ameba, plural amoebae) is a genus of protozoa that moves by means of pseudopods, and is well-known as a representative unicellular organism. The word amoeba or ameba is variously used to refer to it and its close relatives, now grouped as the Amoebozoa, or to all protozoa that move using pseudopods, otherwise termed amoeboids. For other uses, see Genus (disambiguation). ... Leishmania donovani, (a species of protozoan) in a bone marrow cell (in Greek proto = first and zoa = animals) are one-celled eukaryotes (that is, unicellular microbes whose cells have membrane-bound nuclei) that commonly show characteristics usually associated with animals, mobility and heterotrophy. ... Pseudopods or pseudopodia (false feet) are temporary projections of eukaryotic cells. ... A cluster of Escherichia coli bacteria magnified 10,000 times. ... Subgroups Mycetozoa(slime moulds) Archamoebae    Pelobiontida    Entamoebida Gymnamoebia Various others The Amoebozoa are a major group of amoeboid protozoa, including the majority that move by means of internal cytoplasmic flow. ... Amoeba (Chaos diffluens) Foraminiferan (Ammonia tepida) Heliozoan (Actinophrys sol) Amoeboids are cells that move or feed by means of temporary projections, called pseudopods (false feet). ...

Contents

History

The amoeba was first discovered by August Johann Rösel von Rosenhof in 1755.[1] Early naturalists referred to Amoeba as the Proteus animalcule after the Greek god Proteus who could change his shape. The name "amibe" was given to it by Bory de Saint-Vincent[1], from the Greek amoibè, meaning change.[2] Rösel von Rosenhof Plate of illustrations of frogs from Historia Naturalis Ranarum Nostratium Rosenhof plate August Johann Rösel von Rosenhof (March 30, 1705 in Augustenburg near Arnstadt – March 27, 1759 in Nuremberg) was a German miniature painter, naturalist and entomologist. ... This article is about Proteus in Greek mythology. ...


Habitat and uses

Amoeba itself is found in decaying vegetation in fresh and salt water, wet soil and animals.[2] Due to the ease with which they may be obtained and kept alive, they are common objects of study as representative protozoa and to demonstrate cell structure and function. Vegetation is a general term for the plant life of a region; it refers to the ground cover provided by plants, and is, by far, the most abundant biotic element of the biosphere. ... For the village on the Isle of Wight, see Freshwater, Isle of Wight. ... This article or section seems not to be written in the formal tone expected of an encyclopedia entry. ...


Anatomy

Anatomy of an amoeba
Anatomy of an amoeba

The cell's organelles and cytoplasm are enclosed by a cell membrane, obtaining its food through phagocytosis. Amoebae have a single large tubular pseudopod at the anterior end, and several secondary ones branching to the sides. The most famous species, Amoeba proteus, is 700-800 μm in length but the species Amoeba dubia is as large as a millimeter, and visible to the naked eye. Its most recognizable features include one or more nuclei and a simple contractile vacuole to maintain osmotic pressure. Food enveloped by the amoeba is stored and digested in vacuoles. Amoebae reproduce via binary fission. In cases where the amoeba are forcibly divided, the portion that retains the nucleus will survive and form a new cell and cytoplasm, while the other portion dies.[3] Schematic of typical animal cell, showing subcellular components. ... Schematic showing the cytoplasm, with major components of a typical animal cell. ... Look up cell membrane in Wiktionary, the free dictionary. ... Steps of a macrophage ingesting a pathogen: a. ... Pseudopods or pseudopodia (false feet) are temporary projections of eukaryotic cells. ... In sciences dealing with the anatomy of animals, precise anatomical terms of location are necessary for a variety of reasons. ... Binomial name Amoeba proteus, previously Chaos diffluens, is an amoeba closely related to the giant amoebae. ... 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 diameter of a droplet of mist or fog. ... The Amoeba dubia is the largest species of the genus Amoebozoa, more commonly referred to as Amoeba. ... In cell biology, the nucleus is an organelle, found in most eukaryotic cells, which contains most of the cells genetic material. ... Schematic of typical animal cell, showing subcellular components. ... Osmosis is the spontaneous net movement of water across a semipermeable membrane from a region of low solute concentration to a solution with a high solute concentration, down a solute concentration gradient. ... 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. ...


Reaction to stimuli

Hypertonic and hypotonic solutions

Like most cells, amoebae are adversely affected by excessive osmotic pressure caused by extremely saline or dilute water. Amoebae will prevent the influx of salt in saline water, resulting in a net loss of water as the cell becomes isotonic with the environment, causing the cell to shrink. Placed into fresh water, amoebae will also attempt to match the concentration of the surrounding water, causing the cell to swell and sometimes burst.[4] Adjusting the tonicity of the cytoplasm can also damage the digestive enzymes used in phagocytosis, allowing the amoeba to ingest food but not extract energy, resulting in death.[2] Osmosis is the spontaneous net movement of water across a semipermeable membrane from a region of low solute concentration to a solution with a high solute concentration, down a solute concentration gradient. ... For Isotonic muscle exercise, see Isometric exercise and Weight training. ... For the village on the Isle of Wight, see Freshwater, Isle of Wight. ...


Amoebic cysts

Main article: Microbial cyst

In environments which are potentially lethal to the cell, an amoeba may become dormant by forming itself into a ball and secreting a protective membrane to become a microbial cyst. The cell remains in this state until it encounters more favourable conditions.[3] While in cyst form the amoeba will not replicate and may die if unable to emerge for a lengthy period of time.


Marine amoeba

Marine amoeba lack contractile vacuoles and their enzymes and organelles are not damaged by the salt water found in seas, oceans, salt swamps, salty rivers and ponds. Ribbon diagram of the enzyme TIM, surrounded by the space-filling model of the protein. ...


In popular culture

  • Tom Robbins states in the preface to his 1976 novel Even Cowgirls Get the Blues that amoebas are cool because they reproduce by binary fission, so the first amoeba is still alive to this day. The first sentence of the book is "Amoebae have no fossils."
  • In the 1984 computer game Boulder Dash, Rockford, the main character, interacts frequently with a constantly-growing green amoeba.
  • The contemporary British Poet, John Hegley, has a poem entitled Amoeba.
  • The Adolescents have a song titled "Amoeba"
  • The Powerpuff Girls and Demashita! Powerpuff Girls Z have a trio of villains called The Amoeba Boys, who are shown to be lacking in their capacity for true villainous activity (as in one episode, where they steal an orange from a street vendor, and then give it back) compared with world-domination-centered villains such as Mojo Jojo. This seems to be explained by their lack of brain (being single-celled organisms).
  • The 48th produced episode of the classic Star Trek series (The Immunity Syndrome) featured an 11,000-mile (~17 700 km) wide amoeba threatening not only the life of Captain Kirk and his crew, but all life throughout the galaxy.
  • In the fourth installment of The Legend of Zelda (Ocarina of Time), the dungeon boss of the Water Temple is a giant Amoeba that fuses with the water around it.
  • Jon Scieszka's book, Science Verse, had a poem called Amoeba

Tom Robbins at a reading of Wild Ducks Flying Backward in San Francisco on September 24, 2005 Thomas Eugene Robbins (born July 22, 1936 in Blowing Rock, North Carolina) is an American author. ... A preface is an introduction to a book written by the author of the book. ... Even Cowgirls Get the Blues is a 1976 novel by Tom Robbins. ... Look up cool in Wiktionary, the free dictionary. ... Reproduction is the creation of one thing as a copy of, product of, or replacement for a similar thing, e. ... 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. ... This article is about the year. ... For the amusement park ride by the same name, see Boulder Dash (roller coaster). ... John Hegley (born 1 October 1953) is a popular English performance poet, musician and songwriter whose poems and songs have appeared both in print and on the radio. ... The Adolescents are a punk music group formed in 1980 in Fullerton, California. ... The Powerpuff Girls is an Emmy-winning American animated television series about three little girls in kindergarten who have superpowers. ... Demashita! Powerpuff Girls Z , roughly Theyre Here! Powerpuff Girls Z) is the name for a Japanese television anime based upon the American animated television series The Powerpuff Girls. ... The starship Enterprise as it appeared on Star Trek Star Trek is a culturally significant science fiction television series created by Gene Roddenberry in the 1960s. ... The Immunity Syndrome is a second season episode of Star Trek: The Original Series first broadcast January 19, 1968 and repeated June 7, 1968. ... This article is about the first game in the series. ... The Legend of Zelda: Ocarina of Time ) is a video game for the Nintendo 64 console. ... Science Curse is a childrens picture book written by Jon Scieszka and illustrated by Lane Smith. ...

References

  1. ^ Leidy, Joseph (1878). "Amoeba proteus". The American Naturalist 12 (4): 235-238. Retrieved on 2007-06-20. 
  2. ^ a b c McGrath, Kimberley; Blachford, Stacey (eds.) (2001). Gale Encyclopedia of Science Vol. 1: Aardvark-Catalyst (2nd ed.). Gale Group. ISBN 078764370X. 
  3. ^ a b Amoeba (html) (english). Scienceclarified.com. Retrieved on 2007-11-06.
  4. ^ Patterson, D.J. (1981). "Contractile vacuole complex behaviour as a diagnostic character for free living amoebae". Protistologica 17: 243-248. 

Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era in the 21st century. ... is the 171st day of the year (172nd in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era in the 21st century. ... is the 310th day of the year (311th in leap years) in the Gregorian calendar. ...

External links


  Results from FactBites:
 
Amoeba Music > Store Locations (1146 words)
Amoeba SF is a meeting place where musicians, DJs, collectors and artists of all kinds can get together and stay up on the scene.
Like the tiny amoeba, the single-celled source of life, we are independent, but we absorb all influences and grow and change.
Amoeba and the Amoeba Music mark and logo are trademarks of Amoeba Music Inc.
Rare but deadly amoeba infection hard to prevent - CNN.com (897 words)
All were believed by health officials to have contracted an infection from the amoeba from swimming in warm, freshwater lakes, rivers or natural springs.
Symptoms of the amoeba's rampage begin 1 to 14 days after infection and resemble the flu.
Although exposure to the amoeba is usually fatal, Sherin says a cocktail of drugs can fight the amoeba if administered in time.
  More results at FactBites »

 
 

COMMENTARY     


Share your thoughts, questions and commentary here
Your name
Your comments

Want to know more?
Search encyclopedia, statistics and forums:

 


Press Releases |  Feeds | Contact
The Wikipedia article included on this page is licensed under the GFDL.
Images may be subject to relevant owners' copyright.
All other elements are (c) copyright NationMaster.com 2003-5. All Rights Reserved.
Usage implies agreement with terms, 1022, m