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      저자 : Sayed M.S. KHALIL (검색결과 2 건)
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        Synergistic activity of Bacillus thuringiensis δ‐endotoxin and TMOF against Culex pipiens and Spodoptera littoralis larvae

        Ahmed M.A. Mohammed,Mervat R. DIAB,Sayed M.S. KHALIL 한국곤충학회 2018 Entomological Research Vol.48 No.3

        Trypsin Modulating Oostatic Factor (TMOF) is a decapeptide hormone that inhibits the biosynthesis of digestive enzymes in the mosquito midgut. The hormone inhibits food digestion and ultimately leads to starvation and death. It has been used as a biological insecticide to control mosquitoes. In an attempt to increase the insecticidal activity of TMOF, a combination of CryIC (δ‐endotoxin from Bacillus thuringiensis) and TMOF was determined. Eight recombinant proteins fused with GST (glutathione‐S‐transferase) were expressed in Escherichia coli cells. Their insecticidal activities were determined against Culex pipiens and Spodoptera littoralis larvae. Purified GST‐TMOF and its analogue GST‐YDPAS exhibited a moderate toxicity on C. pipiens larvae with LC50 of 145.9 and 339.9 μg/mL, respectively. Unexpectedly, no mortality was observed in first instar larvae of S. littoralis. Puirified GST‐TMOF and GST‐YDPAS together with Bt toxin showed a synergistic toxic effect on both Culex and Spodoptera larvae. In the presence of 100 μg/mL GST‐TMOF and GST‐YDPAS, the median lethal concentration of entomocidus on culex larvae decreased from 52.1 to 16.7 and 31.9 μg/mL, respectively. Likewise, GST‐TMOF and GST‐YDPAS incorporated with 0.07 μg/cm2 of enotmocidus showed insecticidal activity against S. littoralis with LC50 of 16.4 and 21.9 μg/cm2. The E. coli lysates containing GST‐CryIC and its 3′‐truncated version showed low toxicity against the lepidopteran insect (10.8 and 16.6 μg/cm2) compared to 0.15 μg/cm2 of the native crystalline form of CryIC. Similarly, the mosquitocidal activity of the recombinant Bt toxins was low.

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        Effects of ultraviolet radiation on Culex quinquefasciatus immature stages

        Munawar Kashif,Alahmed Azzam M.,Khalil Sayed M.S. 한국곤충학회 2021 Entomological Research Vol.51 No.3

        Ultraviolet radiation has negative effects on different living organisms. The effects of ultraviolet radiation have been widely studied on some insects, such as stored-product pests. However, few studies have examined the effects of ultraviolet radiation on mosquitoes. In this study, we report the effect of ultraviolet radiation type C, or ultraviolet C, on the immature stages of Culex quinquefasciatus. Our results suggest that early larval instars were more susceptible to ultraviolet C than late instars, and longer ultraviolet C exposure times were more lethal to larvae regardless of age. Ultraviolet C caused 100% mortality in pupae after 11 minutes of exposure. No egg hatching was observed after 15 minutes of exposure. Mortality in immature stages occurred over time, especially during larval molting and adult emergence.

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