Amoeba

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Amoeba

 [ah-me´bah]
a genus of ameboid protozoa, most of which are free-living. Those parasitic in humans and once included in this genus have been assigned to other genera.

Amoeba

(ă-mē'bă),
A genus of naked, lobose, pseudopod-forming protozoa of the class Sarcodina (or Rhizopoda), which are abundant soil-dwellers, especially in rich organic debris, and are also commonly found as parasites. The typical amebic parasites of humans are now placed in the genera Entamoeba, Endolimax, and Iodamoeba.
See also: Naegleria.
[Mod. L. fr. G. amoibē change]

Amoeba

/Amoe·ba/ (ah-me´bah) a genus of amebae.

amoeba

also

ameba

(ə-mē′bə)
n. pl. amoe·bas or amoe·bae (-bē)
Any of various one-celled free-living or parasitic protozoans having no definite form and moving by means of pseudopods.

a·moe′bic (-bĭk) adj.

amoeba

See ameba.

Amoeba

(1) A genus of amoebas of the order Amoebida.
(2) An imprecise name for several types of free-living unicellular phagocytic organisms; the pathogenic amoebas have been reclassified as Entamoeba spp, Endolimax spp, and others
Giant forms (eg. Amoeba proteus may be up to 2 mm long and crawl over surfaces by protruding pseudopods). Amoebae exhibit great plasticity of form and conspicuous cytoplasmic streaming.

Amoeba

Parasitology A genus of amebas of the order Amoebida

amoeba

Ameba An imprecise name for several types of free living unicellular phagocytic organisms; the pathogenic amebas have been reclassified as Entamoeba spp, Endolimax spp, and others

A·moe·ba

(ă-mē'bă)
A genus of naked, lobose, pseudopod-forming protozoa of the class Sarcodina (or Rhizopoda), which are abundant soil-dwellers, especially in rich organic debris, and are also commonly found as parasites. The typical amebic parasites in humans are placed in the genera Entamoeba,Endolimax, and Iodamoeba.
[Mod. L. fr. G. amoibē change]

amoeba

A single-celled microscopic organism of indefinite shape commonly found in water, damp soil and as parasites of other animals. Some amoebae, such as Entamoeba histolytica and Acanthamoeba castellani cause disease in man, respectively AMOEBIC DYSENTERY and acanthamoebic keratitis.
Amoebaclick for a larger image
Fig. 31 Amoeba . General structure.

Amoeba

a genus of unicellular PROTOZOANS in the class Rhizopoda. Amoebae are characterized by their changing shape brought about by the projection of PSEUDOPODIA which have a locomotory function. Amoeba is often wrongly quoted as an example of a primitive organism, low on the evolutionary scale. However, as in many PROTISTA, functions that are carried out by organ systems in so-called ‘higher’ forms are here carried out within a single cell, therefore they cannot be considered ‘primitive’; they are highly evolved over millions of years, albeit on a different scale from higher organisms.

Amoeba

A type of protozoa (one-celled animal) that can move or change its shape by extending projections of its cytoplasm.
Mentioned in: Stool O & P Test

A·moe·ba

(ă-mē'bă)
A genus of naked, lobose, pseudopod-forming protozoa of the class Sarcodina (or Rhizopoda), which are abundant soil-dwellers, especially in rich organic debris, and are also commonly found as parasites. The typical amebic parasites in humans are placed in the genera Entamoeba, Endolimax, and Iodamoeba.
[Mod. L. fr. G. amoibē change]

amoeba (əmē´bə),

n a Rhizopod protozoa that uses extensions of its cytoplasm, called pseudopodia, to move. Some varieties of amoebae are implicated in human infection. Also spelled
ameba(s).

Amoeba

a genus of the subphylum Sarcodina. It is a single-celled mass of protoplasm which changes shape by extending cytoplasmic processes called pseudopodia by which it moves about and absorbs nutrients. The majority of amebae are free-living in soil and water. See also amebic.

Patient discussion about Amoeba

Q. is an Amoeba dangerous?? and how can i get rid of it? my son is in Peru, he called and told me he got an Amoeba..i have no idea if it's dangerous or not, and how to get rid of it. and what kinds of food he needs to avoid.I'll appreciate help!

A. oooo...an Amoeba is a nasty one...but not so dangerous! it's a one celled parasite which gets into your body if you eat in restaurants that the cook doesn't wash hands after going to the bathroom..it multiplies in your intestine and makes you diarrhea like hell. but if you'll treat it right it will go away as nothing happened. if you don't it can give you liver cyst. and that's not good. he should see a Dr.

More discussions about Amoeba
References in periodicals archive ?
Free-living amebae of the genera Acanthamoeba, Balamuthia, and Naegleria are typically rare causes of meningoencephalitis in humans.
Amebae were cultivated on non-nutrient agar plates covered with E.
Amebae can be directly transmitted by anal sexual contact.
A genetic predisposition to Balamuthia mandrillaris GAE has now been identified in American Hispanics, who appear less able to produce effective antibodies against some free living amebae, and may be predisposed by more frequent contact with Balamuthia-contaminated soils and aerosols in agricultural and landscaping occupations.
Originally isolated from the brain of a mandrill that died of meningoencephalitis at the San Diego Zoo, Balamuthia mandrillaris is named for the late professor William Balamuth of the University of California at Berkeley, for his contributions to the study of amebae.
Histopathologic testing of donor autopsy brain tissue at CDC showed amebae, and subsequent testing of specimens from the donor and the two kidney recipients confirmed transmission by transplantation of Balamuthia granulomatous amebic encephalitis (GAE), a rare disease caused by Balamuthia mandrillaris, a free-living ameba found in soil (1).
Postmortem, the skin lesion was found to be positive for Balamuthia amebae by indirect immunofluorescence staining and polymerase chain reaction (PCR), and might have been the portal of entry preceding development of CNS disease.
Cases have been caused by emerging pathogens, including West Nile virus (WNV) (7, 8), rabies virus (9), lymphocytic choriomeningitis virus (LCMV) (10), and Balamuthia mandrillaris amebae (11).
fowleri entering the nose, followed by migration of the amebae to the brain via the olfactory nerve.
However, mixed keratitis caused by amebae in association with ameba-resistant pathogens is rarely seen.
Follow-up lumbar puncture later the same day revealed motile amebae in a centrifuged CSF specimen.