إعـــــــلان

تقليص
لا يوجد إعلان حتى الآن.

ممكن تقرير عن البارا

تقليص
X
 
  • تصفية - فلترة
  • الوقت
  • عرض
إلغاء تحديد الكل
مشاركات جديدة

  • ممكن تقرير عن البارا

    ممكن مساعده ابغى report للبارا

    وشكرا
    التعديل الأخير تم بواسطة أميرة يمنية; الساعة 19-12-2010, 04:28 PM.

  • #2
    تقارير

    هذه تقارير عن الطفيليات في البراز
    الملفات المرفقة
    إذا أردت أن تعيش سعيداً .. إنزع الحقد من قلبك

    تعليق


    • #3
      Parasitology is a discipline that describes the relationships (whatever these may be) between two organisms, i.e. the host organism and the parasite. However, to define what is a host and what is a parasite we have to define what exactly is parasitism. When one organism gives ****ter and food to another organism two totally different situations may exist:
       Without any harm being done, or in the case where some hosts may benefit from the presence of a parasite, in which case we normally speak of:
      o mutualism: a situation where two organisms live in some contact and benefit from each others presence. They exchange food or provide ****ter or protection, but may still be able to live an independent life.
      o symbiosis: a situation where two organisms live in close contact and benefit from each others presence. They have become dependent upon each others presence and are unable to survive independently.
      o endosymbiosis: bacteria have invaded the cytoplasm of a eukaryotic host cell. Host cell and bacterium have become dependent upon each other. In the case large amounts of genetic material have been moved from the bacterial genome to the nucleus of the host an irreversible situation is reached which led to the formation of:
       chloroplasts, photosynthetic organelles that have originated from photosynthetic cyanobacteria
       mitochondria, organelles involved in oxidative phosphorylation that have originated from the alpha subdivision of the proteobacteria.
       With harm being done.
      When one organism lives at the expense of its host we can distinct several situations:
      o viral infections
      o bacterial infections
      2
      o parasitic diseases

      تعليق

      يعمل...
      X