عين النسر المدير العام
رقم العضوية : 1 عدد المساهمات : 2247 نقاط : 15898 تاريخ التسجيل : 25/02/2010
| موضوع: البوم ل Entamoeba histolytica السبت 10 أبريل - 15:51:43 | |
| Entamoeba histolyticaE. histolytica/E. dispar cysts in concentrated wet mounts.
Mature Entamoeba histolytica/Entamoeba dispar cysts have 4 nuclei that characteristically have centrally-located karyosomes and fine, uniformly distributed peripheral chromatin. Cysts usually measure 12 to 15 µm.
| | A | B |
A, B: Cysts of E. histolytica/E. dispar in an unstained concentrated wet mount of stool. Notice the chromatoid bodies with blunt, rounded ends (arrows).
| | C | D |
C, D: Cysts of E. histolytica/E. dispar in a concentrated wet mount stained with iodine. Notice the chromatoid body with blunt, rounded ends in Figure D (arrow).
E. histolytica/E. dispar cysts stained with trichrome.
Mature Entamoeba histolytica/Entamoeba dispar cysts have 4 nuclei that characteristically have centrally-located karyosomes and fine, uniformly distributed peripheral chromatin. Cysts usually measure 12 to 15 µm.
| | A | B |
A: Cyst of E. histolytica/E. dispar stained with trichrome. Note the chromatoid body with blunt ends (red arrow). B: Cyst of E. histolytica/E. dispar stained with trichrome.
| | C | D |
C, D: Cysts of E. histolytica/E. dispar stained with trichrome. Two to three nuclei are visible in the focal plane (black arrows), and the cysts contain chromatoid bodies with typically blunted ends (red arrows). The chromatoid body in C is particularly well demonstrated.Life cycle of E. histolytica. | Cysts and trophozoites are passed in feces . Cysts are typically found in formed stool, whereas trophozoites are typically found in diarrheal stool. Infection by Entamoeba histolytica occurs by ingestion of mature cysts in fecally contaminated food, water, or hands. Excystation occurs in the small intestine and trophozoites are released, which migrate to the large intestine. The trophozoites multiply by binary fission and produce cysts , and both stages are passed in the feces .
Because of the protection conferred by their walls, the cysts can survive days to weeks in the external environment and are responsible for transmission. Trophozoites passed in the stool are rapidly destroyed once outside the body, and if ingested would not survive exposure to the gastric environment. In many cases, the trophozoites remain confined to the intestinal lumen (: noninvasive infection) of individuals who are asymptomatic carriers, passing cysts in their stool. In some patients the trophozoites invade the intestinal mucosa (: intestinal disease), or, through the bloodstream, extraintestinal sites such as the liver, brain, and lungs (: extraintestinal disease), with resultant pathologic manifestations. It has been established that the invasive and noninvasive forms represent two separate species, respectively E. histolytica and E. dispar. These two species are morphologically indistinguishable unless E. histolytica is observed with ingested red blood cells (erythrophagocystosis). Transmission can also occur through exposure to fecal matter during sexual contact (in which case not only cysts, but also trophozoites could prove infective).
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العنكبوت عضو فعال
رقم العضوية : 13 عدد المساهمات : 387 نقاط : 11119 تاريخ التسجيل : 08/03/2010
| موضوع: رد: البوم ل Entamoeba histolytica الأربعاء 17 نوفمبر - 11:25:19 | |
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قمر14 مشرفة منتدى المرأة و الأعمال اليدوية
رقم العضوية : 12 عدد المساهمات : 664 نقاط : 11806 تاريخ التسجيل : 07/03/2010
| موضوع: رد: البوم ل Entamoeba histolytica الأربعاء 17 نوفمبر - 13:25:01 | |
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عين النسر المدير العام
رقم العضوية : 1 عدد المساهمات : 2247 نقاط : 15898 تاريخ التسجيل : 25/02/2010
| موضوع: رد: البوم ل Entamoeba histolytica الأربعاء 17 نوفمبر - 23:51:55 | |
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سلسبيل مشرفة منتدى الطفل و المطبخ
رقم العضوية : 10 عدد المساهمات : 381 نقاط : 11155 تاريخ التسجيل : 04/03/2010
| موضوع: رد: البوم ل Entamoeba histolytica الخميس 18 نوفمبر - 22:36:43 | |
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Tiger مشرف عالم الحيوان
رقم العضوية : 11 عدد المساهمات : 374 نقاط : 11145 تاريخ التسجيل : 07/03/2010
| موضوع: رد: البوم ل Entamoeba histolytica الإثنين 29 نوفمبر - 18:19:50 | |
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فارس البادية عضو فعال
رقم العضوية : 2 عدد المساهمات : 252 نقاط : 10943 تاريخ الميلاد : 18/11/1972 تاريخ التسجيل : 25/02/2010
| موضوع: رد: البوم ل Entamoeba histolytica السبت 4 ديسمبر - 22:41:44 | |
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رهين ليل عضو جديد
رقم العضوية : 129 عدد المساهمات : 1 نقاط : 9275 تاريخ الميلاد : 22/06/1984 تاريخ التسجيل : 09/07/2011
| موضوع: رد: البوم ل Entamoeba histolytica السبت 9 يوليو - 19:41:48 | |
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