سؤال ذكي في علم الطفيليات

السؤال في علم الطفيليات :
How ou can differntiate between E.coli and E.histoltica ؟
؟

يلا أروني الردود خليني أتشجع

عضو ذهبي المساهمات : 211 تاريخ التسجيل : 28/05/2008

السلام عليكم ورحمة الله وبركاته....

بالنسبة للفرق بين E.coli وE.histolytica:

§ E.coli is sluggish in its movements in comparison with E.histolytica
§ Pseudopodia are short and blunt, never long and fingerlike as they may be in E.histolytica.
§ E.coli is irregular both in size and in arrangement on the nuclear membrane; it is definitely more abundant than is usual in E.histolytia.
§ Chromatoidal bodies are less common than in E.histolytia.

Characteristics	E. histolytica	*E. coli*
Trophozoites (size, nucleus, and movement)	15-20 µm; 1 nucleus; actively motile cytoplasmic protrusions, quickly finger shaped pseudopodium	20-25 µm; 1 nucleus; slow movement, short and blunt pseudopodium
Cysts (size, nucleus)	12-15 µm; mature cyst has 4 nuclei, immature cyst has 1 or 2 nuclei	15-25 µm; mature cyst has 8 nuclei, rarely 16 or more nuclei
Appearance of trophozoites	Stained trophozoites fine, uniform granules of peripheral chromatin, and small central karyosome in nucleus; ingested RBC	Nuclear with irregular cluster of peripheral chromatin; large, irregular, eccentric karyosome
Appearance of cysts	Uniform size in having both karyosome and peripheral chromatin, typical nuclear structure, chromatodial bars with squared or rounded ends	Typical nuclear structure, sliver-shaped or irregular chromatoidals
Pathogenicity	Pathogen	Nonpathogen

المصادر:
http://cmr.asm.org/cgi/content/full/16/4/713/T1
http://www.delmarlearning.com/samplechapters/dl
_display_sampchap.aspx?isbn=0766812847&cid=6
Markell and Vpge’s, Medical Parasitology, 9th 2006

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