Search results
Results From The WOW.Com Content Network
The cyst wall of some ciliated protists is composed of four layers, ectocyst, mesocyst, endocyst, and the granular layer. The ectocyst is the outer layer and contains a plug-like structure through which the vegetative cell reemerges during excystation. Interior to the ectocyst, the thick mesocyst is compact yet stratified in density.
Phoronts go through metamorphosis to prepare for excystation. Metamorphosis changes the body shape, organization, and physiology of the phoront to allow for rapid ingestion and storage of large amounts of food. Histotrophic phoronts metamorphose within a few hours of encysting on their hosts.
Entamoeba coli is a non-pathogenic species of Entamoeba that frequently exists as a commensal parasite in the human gastrointestinal tract. E. coli (not to be confused with the bacterium Escherichia coli) is important in medicine because it can be confused during microscopic examination of stained stool specimens with the pathogenic Entamoeba histolytica. [1]
Once in the intestine of its host, cysts undergo excystation into the trophozoite stage that feeds on intestinal bacteria. [3] Each cyst gives rise to only one trophozoite. [9] Retortamonas trophozoites then multiply asexually through lateral binary fission. [2] [9] Eventually the trophozoites encyst, and the cysts are discharged via feces.
Giardiasis is a parasitic disease caused by Giardia duodenalis (also known as G. lamblia and G. intestinalis). [3] Infected individuals who experience symptoms (about 10% have no symptoms) may have diarrhea, abdominal pain, and weight loss. [1]
Life-cycle of Entamoeba histolytica. Entamoeba histolytica is an anaerobic parasitic amoebozoan, part of the genus Entamoeba. [1] Predominantly infecting humans and other primates causing amoebiasis, E. histolytica is estimated to infect about 35-50 million people worldwide. [1]
Chilomastix is a genus of pyriform excavates within the family Retortamonadidae [1] All species within this genus are flagellated, structured with three flagella pointing anteriorly and a fourth contained within the feeding groove. [1]
Balantidium is the only ciliated protozoan known to infect humans. Balantidiasis is a zoonotic disease and is acquired by humans via the feco-oral route from the normal host, the domestic pig, where it is asymptomatic.