Amebae  Inhabiting The  Aleimentary  Canal
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Amebae Inhabiting The Aleimentary Canal

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Amebae  Inhabiting The  Aleimentary  Canal Amebae Inhabiting The Aleimentary Canal Presentation Transcript

  • Amebae Inhabiting the Aleimentary Canal Chapter 11 By Beaver
  • Introduction:
    • From the Subphylum Sarcodina
    • Superclass: Rhizopoda
    • Order: Ameobida
    • General Characteristics :
    • 1. Small , microscopic in size.
    • 2. Have amoeboid motion.
    • 3. Lack contractile vacoules
    • 4. Multiply through binary fission
    • 5. Undergo encystation during unfavorable condition.
    • 6.It has a pseudopodium as the locomotory organ.
    • In the genera of Entamoebidae are differentiated by:
    • = nuclear structure
  • Genus : Entameobidae
    • Spherical nucleus
    • Distinct nuclear membrane lined with chromatin granules.
    • Small karyosomes.
    • Generally the trophozoite has single nucleus.
    • Natural parasites of the alimentary canal in most vertebrates.
  • Entamoeba histolytica
    • Synonyms :
    • - Amoeba coli
    • - Amoeba dysenteriae
    • - Entamoeba dysenteriae
    • - Entamoeba terragena
    • - Endameoba histolytica
    • - Endameoba dysenteria
  • General Characteristics:
    • Have successive stages: trophozoite, precyst, cyst, metacyst and metacystic trophozoite.
    • Movement results from long finger-like or rounded pseudupodial extensions that progressively in one direction.
    • Nucleus is spherical, with a diameter about one fifth of the entire amoeba.
    • The active ( trophozoite ) stage exists only in the host and in fresh loose feces
    • 5. cysts survive outside the host in water, soils and on foods, especially under moist conditions on the latter.
    • 6. Mode of entry is through ingestion of contaminated food and water.
    • 7. Ring and dot' appearance: peripheral chromatin and central karyosome
    • 8. 4 visible nuclei
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  • Cyst
  • Trophozoite stage
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  • Life Cycle
    • Infection occurs by ingestion of cysts (generally from fecally contaminated food or water)
    • Excystation occurs in the ileum of the small intestine
    • Trophozoites multiply by binary fission in the large intestine. Most remain in the lumen of the intestine, however, some may invade the intestinal mucosa, enter the bloodstream and develop in extraintestinal sites. Symptoms
    • Cyst formation is triggered by the dehydration of gut contents in asymptomatic carriers.
    • Asymptomatic
    • Amebiasis is a disease caused by a one-celled parasite called Entamoeba histolytica (ent-a-ME-ba his-to-LI-ti-ka) .
    • If trophozoites penetrate the intestinal wall, serious problems can occur, including liver abcesses, or spread to the lungs and brain, usually resulting in death.
    Symptoms/Pathology
  • Pathogenesis
    • Vegetative – trophozoite stage
    • size: 4-12 micrometer
    • motility: active directional
    • pseudopodia : fingered shape
    • rapidly extruded
    • Inlcusions : Bacteria and other
    • material no corpuscles
    • nucleus : invisible
    Entamoeba hartmanni
  • Common names
    • Entamoeba tenuis
    • Entamoeba minuta
    • Entamoeba minutissima
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  • cyst
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  • Entamoeba coli
    • Known as:
    • - Amoeba coli
    • - Endamoeba hominis
    • - Loschia coli
    • - Councilmania lafleuri
    • small cyst with one visible nucleus. The nucleus shows the peripheral chromatin and a central karyosome
    • trophozoites (4-11 µm) are similar to E.histolytica trophozoites, present a small karyosome often eccentrical .
    • Resembles E.histolytica
    • Small race
    • Asymptomatic to humans
    • is a non-pathogenic species of Entamoeba that frequently exists as a commensal parasite in the human gastrointestinal tract .
    • trophozoites measure 20-30 µm and have a vescicolous nucleus with a large eccentric karyosome
    • irregulary distributed peripheral chromatin.
    • The cytoplasm is vacuolated containing bacteria and yeast
    • Similar life cycle with E. histolytica
  • Cyst
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  • trophozoite
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