Publications

We report changes in the abundance of vitellogenin (Vg) mRNA, and concentration of haemolymph Vg and ovarian vitellin (Vn) in Anopheles gambiae following infection with Plasmodium yoelii nigeriensis. A parasite-induced reduction in Vg mRNA abundance...
Many insects are able to adjust their egg production according to physiological conditions such as nutrient supply and mating success. One way in which this is achieved is by resorption of some, or all, of the ovarian follicles at some stage during...
We have used Anopheles gambiae, a major vector of malaria in Africa, to test the hypothesis that the operation of a surveillance or immune system against microorganisms and parasites can be costly to the reproductive success of the host. Blood-fed...
Melanization is the main immune response killing malaria parasite in the gut of the malaria refractory mosquitoes. This study investigates this response against Sephadex beads model in the malaria susceptible Anopheles gambiae at 20 h post-beads...
The mosquito Anopheles gambiae, the major vector of malaria in Africa, was used to test the hypothesis that the utilization of immune system against malaria parasites could be possible. Two immune elicitors, the bacteria, Micrococcus luteus and the...
In this study, induction of the humoral anti-bacterial activity of the African human malaria vector, Anopheles gambiae, and the mechanisms of the concomitant fecundity reduction were investigated. The blood meal induced a humoral anti-Micrococcus...
costs have been associated with both humoral and cellular innate immune responses and also with malaria infection. The resorption of developing oocytes associated with malaria infection is preceded by the programmed cell death, or apoptosis, of...
Great efforts are currently being done to utilize the immune system of mosquito vector in the battle against malaria. However, this strategy still facing some limiting factors mainly the reproductive cost, the price of immune induction. This study...
In this study, a preliminary virulence test on three concentrations (1 × 106, 1 × 107 and 1 × 108 conidial spore ml-1) of the aqueous conidial suspension of the four entomopathogenic fungi isolates, Beauveria bassiana IMI 382302, Beauveria bassiana...
Great efforts are currently being done to utilize the immune system of mosquito vectors in the battle against the different mosquito-borne parasitic and viral diseases. Based on this control strategy, the current study has been conducted to induce...
Insects have developed an efficient defence system against microorganisms, which involves both humoral and cellular mechanisms. Recent studies on insect defence system are aimed at utilizing it in the battle against mosquito-borne diseases. However...
In Ar-Riyadh Region in the Kingdom of Saudi Arabia (KSA), the Governorates of Al-Zulfi, Al-Ghat and Al-Majmah (north zone), of Al-Hariq, Al-Aflaj and Hawtat Bani Tamim (south zone), of Hijrat Sa`ad (east zone), of Shaqra, Durma, Al-Qasab, Huraimela`...
The major volatile compounds in the poison glands of two Monomorium ant species from Saudi Arabia have been identified. Monomorium niloticum and Monomorium najrane both contain mixtures of alkyl- and alkenyl-pyrrolidines and -pyrrolines in their...
Ant species use branching networks of pheromone trails for orientation between nest and resources. The current study demonstrated that workers of the venomous samsum ant, Pachycondyla sennaarensis (Mayr) (Hymenoptera: Formicidae), employ recruitment...
Black ant (Samsum), Pachycodyla sennarrensis, stings and injects venom and inflicts allergy (a rare clinical problem) due to its local and systemic reaction, which is considered as a health hazard amongst Saudi society. Thus, black ant is a source...
Our current knowledge on the key molecular mechanisms and cognate signaling transduction, by the dendotoxin- mediated mosquitoticidal effects, associated with exposure to Bacillus thuringiensis (Bt) and Bacillus sphaericus (Bs), is limited. Moreover...
The present study aimed to identify the mosquito vectors distributed throughout AL-Ahsaa district situated in the eastern region of Saudi Arabia. Mosquito larvae were collected seasonally for one year (October 2009 to September 2010) from different...
This study investigates the glutathione-immunity interaction upon infection of both larval and adult stages of Aedes caspius with Bacillus thuringiensis kurstaki (Btk). The anti-oxidative stress, in terms of glutathione (GSH) titer, and melanization...
It has recently been shown that Bacillus thuringiensis kurstaki (Btk) suppressed both immune and antioxidant responses in the autogenous mosquito, Aedes caspius. The purpose of the presented study herein was to investigate the concomitant oxidative...
The present study recorded mosquito autogeny for the first time amongst Aedes caspius species in the Eastern region of Saudi Arabia. Laboratory rearing showed an obligatory autogenous species of Ae. caspius since it foregoes blood feeding during its...
Insects possess effective defense mechanisms against pathogens via induction of antimicrobial immune and oxidative stress responses. In this study, immune impact and histological damages in the gastric caeca have been investigated in the 3rd instar...
This study was conducted to investigate the oxidative stress and apoptotic signs detectable by flow cytometry as proposed pathogenicity mechanisms for the mosquitocidal bacterium Bacillus thuringiensis (Bt) in the mosquito vector, Culex pipiens....
The ant Pachycondyla sennaarensis (Mayr) (Hymenoptera: Formicidae: Ponerinae) is a small dark ant, a recent accidental introduction into Saudi Arabia. It tends to be found in or near human habitations, and it is particularly unpleasant because its...
Abstract.- In this study, laboratory assessment was made with a water-dispersible toxin solution formulation of Pseudomonas frederiksbergensis bacterium. The study was conducted to determine the activity of an isolated extract formulation of P....
Abstract.- This study was conducted to test the toxicity of a novel bacterial product against the filaria vector, Culex pipiens, mosquito in Saudi Arabia for the first time. This bacterial product was extracted from the soil bacterium, Pseudomonas...
The present study was aimed at molecular and phenotypic characterization of two new bacterial strains isolated from entomopathogenic nematodes, Heterorhabditis indica RM1 from Alexandria, northern Egypt and Heterorhabditis sp. S1 from RasSidr, South...
Background: The incidence of mosquito-borne diseases and the resistance of mosquitoes to conventional pesticides have recently caused a panic to the authorities in the endemic countries. This study was conducted to identify native larvicidal...
Background Worldwide, mosquito vectors are transmitting several etiological agents of important human diseases, including malaria, causing millions of death every year. In Saudi Arabia as elsewhere, vector-control is based mostly on chemical...