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Articles by A.A. Zayed
Total Records ( 2 ) for A.A. Zayed
  Hanan A. El-Sadawy , A.A. Zayed and Amira El-Shazly
  Biological control of hard ticks, Hyalomma dromedarii (Acari: Ixodidae) using entomopathogenic nematode of two families; Heterorhabditidae and Steinernematidae was studied. The protective effect of controlled ticks including haemolymph and haemocytes against these biological agents were also investigated. It was found that heterorhabditid strains cause a higher effect in biological control of engorged female H. dromedarii than those of stienernematid strains. It induced mortality rates ranged from 12-92% versus 4-88% for stienernematid strains. It was also found that these entomopathogenic nematodes can not reproduce within the exposed ticks. SDS-PAGE of proteins extracted from midguts and salivary glands infected with 4000 IJs tick-1 separated 21 and 25 protein bands versus 13 and 19 protein bands from non-infected ones, respectively. It was concluded that entomopathogenic nematodes of family Heterorhabditidae proved to have a potential acaricidal effect in the control of hard ticks. Moreover, the controlled ticks released unknown proteins in their haemolymph that may promote the haemocytes to phagocyte the nematodes as a type of defense mechanism.
  A.A. Zayed , S. Abdel-Shafy and R.M. El-Khateeb
  Scanning electron microscope was used to describe the fine structure of posterior spiracles of third instars of Cephalopina titillator, Oestrus ovis and Rhinoestrus purpureus. The posterior spiracles was found to locate a hallow depressed cuticle of the posterior end of the larval body with an ecdysal scar. The cuticle surrounding the posterior spiracles was provided with spinules and sensory papillae of a taxonomic value. The spinules were numerous and irregularly distributed in dorsal and ventral rows in C. titillator and O. ovis. However, these spinules were few or absent in R. purpureus. The sensory papillae were of different shape; it long and cone-shape in R. purpureus, flat and button-shaped in C. titillator and reduced in O. ovis. The posterior spiracles consisted of two spiracular plates. Each plate appeared strongly sclerotized bearing numerous of respiratory units. The situation of spiracular plate together with ecdysal scar was also of a characteristic taxonomic value. The ecdysal scar surrounded by the spiracular plate either completely in O. ovis or partially in R. purpureus or never surrounded by it in C. titillator but situated medially at the edge of the spiracular plate. The respiratory unit consisted of rima and respiratory slit which appeared a narrow as zigzag-like in O. ovis. This respiratory slit appeared linear not zigzag with a few trabecular tissues in C. titillator. However, this slit was covered with a cap-like structure in R. purpureus. It was concluded that the posterior spiracles of nasal bots have a characteristic line structures of taxonomic value, which may be used for differentiation of these larval species.
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