ID#: 11167
Caption:
Magnified 3000X, this 2002 scanning electron microscopic (SEM) image revealed some of the ultrastructure exhibited by a number of Hartmannella vermiformis amoebae cysts. The amoeba assumes the cystic stage of its lifecycle under harsh conditions like drought, or in the event of accumulated toxins in its environment, which can reduce its metabolic requirements. Under these circumstances, the protozoa produces a protective coat, and goes dormant to await better conditions. There is another major lifecycle stage through which this organism passes, known as the trophozoite stage (see PHIL 11165), which is its vegetative phase. In this stage, the creature spends time feeding, moving about, and reproducing. This free-living protozoan moves in response to chemical signals in its environment by extending pseudopodia, or false feet. See the link below for more on the study that inspired the creation of this image.
High Resolution: Click here for hi-resolution image (5.49 MB)
Content Provider(s): CDC/ Dr. Rodney Donlan
Creation Date: 2002
Photo Credit: Janice Haney Carr
Links: CDC – Microbiology (2001): ” Role of biofilms in the survival of Legionella pneumophila in a model potable-water system”
Categories:
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Copyright Restrictions: None - This image is in the public domain and thus free of any copyright restrictions.