Metabolism of Trophozoites

  • Donald G. Lindmark
  • Edward L. Jarroll


The protozoon Giardia lamblia is a member of the order Diplomonadida which includes a variety of binucleate flagellate parasites typically inhabiting the intestinal tract of mammals, birds, and reptiles (Kulda and Nohynkova, 1978). Each organism has eight flagella and a striated disc which might play a role in its attachment to enterocytes (Holberton, 1974). Although it lacks mitochondria and microbodies, G. lamblia is a typical eukaryote which contains lysosomelike organelles that give a positive histochemical reaction for acid phosphatase and can accumulate ferritin (Bockman and Winborn, 1968). This cellular organization, characterized by the absence of mitochondria, is also found in other groups of parasitic protozoa, including the Entamoeba spp. and trichomonads (Lindmark and Müller, 1973).


Malate Dehydrogenase Sterol Ester Entamoeba Histolytica Orotic Acid Fumarate Hydratase 
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Copyright information

© Springer Science+Business Media New York 1984

Authors and Affiliations

  • Donald G. Lindmark
    • 1
  • Edward L. Jarroll
    • 1
  1. 1.Department of Preventive Medicine, New York State College of Veterinary MedicineCornell UniversityIthacaUSA

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