This paper described a new method for the trace determination of fenpropathrin, cyhalothrin and deltamethrin using multiwalled carbon nanotubes （MWCNTs） cartridge. Important parameters, such as the sample pH, eluent...This paper described a new method for the trace determination of fenpropathrin, cyhalothrin and deltamethrin using multiwalled carbon nanotubes （MWCNTs） cartridge. Important parameters, such as the sample pH, eluent and its volume, sample flow rate and sample volume were investigated in detail. The linear ranges, the detection limits, and precisions （R.S.D.） were in the range of 0.1- 40 μg L^-11, 1.34.3 ng L^-1 and 2.3-2.8%, respectively. The performance of the proposed method was validated with real water samples, and the spiked recoveries were in the range of 91.7-117.8%, respectively. The experimental results demonstrated that the proposed method was an excellent alternative for the routine analysis of such pollutants in environmental samples. 2007 Qing Xiang Zhou. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.展开更多
The resistant inheritance mode of Tetranychus cinnabarinus to fenpropathrin were studied based on the resistance selection in laboratory. After 40 generations selection, T. cinnabarinus developed 68.5-fold resistance ...The resistant inheritance mode of Tetranychus cinnabarinus to fenpropathrin were studied based on the resistance selection in laboratory. After 40 generations selection, T. cinnabarinus developed 68.5-fold resistance to fenpropathrin. The methods of cross and back-cross between resistant （R） and sensitive （S） strains were used for exploring the inheritance mode of the resistance of this mite to fenpropathrin. The log （Lc）-p equation of F1 got from obverse （SR） and reverse （RS） crosses was intermediate between S and R and inclined to S, the dominant indices DSR and DRS were -0.83 and -0.29, respectively, which indicated that the resistance is controlled by the incompletely recessive gene; the 95% confidence limit of this two dominant indices do not superpose showing DSR and DRS have significant difference and the maternal or external karyon effect may be existed in resistance inheritance; the back-cross results of heterozygote F1 with its parents suggested that the separation of progenies F2 （SR♀× S ♂ and RS ♀ × R ♂） was consistent with Mendel＇s single gene inheritance model.展开更多
The silkworm Bombyx mori L.is a model organism of the order Lepidoptera.Understanding the mechanism of pesticide resistance in silkworms is valuable for Lepidopteran pest control.In this study,comparative metabolomics...The silkworm Bombyx mori L.is a model organism of the order Lepidoptera.Understanding the mechanism of pesticide resistance in silkworms is valuable for Lepidopteran pest control.In this study,comparative metabolomics was used to analyze the metabolites of 2 silkworm strains with different pesticide resistance levels at 6,12,and 24 h after feeding with fenpropathrin.Twenty-six of 27 metabolites showed significant differences after fenpropathrin treatment and were classified into 6 metabolic pathways:glycerophospholipid metabolism,sulfur metabolism,glycolysis,amino acid metabolism,the urea cycle,and the tricarboxylic acid(TCA)cycle.After analyzing the percentage changes in the metabolic pathways at the 3 time points,sulfur metabolism,glycolysis,and the TCA cycle showed significant responses to fenpropathrin.Confirmatory experiments were performed by feeding silkworms with key metabolites of the 3 pathways.The combination of iron(II)fumarate+folic acid(IF-FA)enhanced fenpropathrin resistance in silkworms 6.38 fold,indicating that the TCA cycle is the core pathway associated with resistance.Furthermore,the disruption of several energy-related metabolic pathways caused by fenpropathrin was shown to be recovered by IF-FA in vitro.Therefore,IF-FA may have a role in boosting silkworm pesticide resistance by modulating the equilibrium between the TCA cycle and its related metabolic pathways.展开更多
The degradation rates of fenpropathrin, phoxim and their mixture in un sterilized soil were much quicker than those in sterilized soil, which indicated that soil microorganisms played a significant role in the degrada...The degradation rates of fenpropathrin, phoxim and their mixture in un sterilized soil were much quicker than those in sterilized soil, which indicated that soil microorganisms played a significant role in the degradation process in soil. The half life (T 0.5 ) in un sterilized soil was 56.2 d for fenpropathrin, 57.8 d for mixed fenpropathrin, 48.2 d for phoxim, and 41.7 d for mixed phoxim. The corresponding half life (T 0.5 ) in sterilized soil was 135.1 d, 147.3 d, 123.6 d, and 126.2 d, respectively. There were no significant differences for degradation rates between single use and mixed use of fenpropathrin and phoxim.展开更多
基金This work was supported by the Creative Talented Person＇s Fund of Henan Province （No. [20051126）；Natural Science Foundation of Henan Province （No. 072300460010）；the Fund of Henan Normal University （No. 2006PL06）；the grants from the Henan Key Laboratory for environmental pollution control.
文摘This paper described a new method for the trace determination of fenpropathrin, cyhalothrin and deltamethrin using multiwalled carbon nanotubes （MWCNTs） cartridge. Important parameters, such as the sample pH, eluent and its volume, sample flow rate and sample volume were investigated in detail. The linear ranges, the detection limits, and precisions （R.S.D.） were in the range of 0.1- 40 μg L^-11, 1.34.3 ng L^-1 and 2.3-2.8%, respectively. The performance of the proposed method was validated with real water samples, and the spiked recoveries were in the range of 91.7-117.8%, respectively. The experimental results demonstrated that the proposed method was an excellent alternative for the routine analysis of such pollutants in environmental samples. 2007 Qing Xiang Zhou. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
基金This study was supported by the National Natural Science Foundation of China(39970493)．
文摘The resistant inheritance mode of Tetranychus cinnabarinus to fenpropathrin were studied based on the resistance selection in laboratory. After 40 generations selection, T. cinnabarinus developed 68.5-fold resistance to fenpropathrin. The methods of cross and back-cross between resistant （R） and sensitive （S） strains were used for exploring the inheritance mode of the resistance of this mite to fenpropathrin. The log （Lc）-p equation of F1 got from obverse （SR） and reverse （RS） crosses was intermediate between S and R and inclined to S, the dominant indices DSR and DRS were -0.83 and -0.29, respectively, which indicated that the resistance is controlled by the incompletely recessive gene; the 95% confidence limit of this two dominant indices do not superpose showing DSR and DRS have significant difference and the maternal or external karyon effect may be existed in resistance inheritance; the back-cross results of heterozygote F1 with its parents suggested that the separation of progenies F2 （SR♀× S ♂ and RS ♀ × R ♂） was consistent with Mendel＇s single gene inheritance model.
基金the National Natural Science Foundation of China(31802137)the Jiangsu Government Scholarship for Overseas Studies(JS-2019-230)+1 种基金the Zhejiang Provincial Natural Science Foundation(No.LY20C040002)the Postgraduate Research and Practice Innovation Program of Jiangsu Province(SJCX22_1993).
文摘The silkworm Bombyx mori L.is a model organism of the order Lepidoptera.Understanding the mechanism of pesticide resistance in silkworms is valuable for Lepidopteran pest control.In this study,comparative metabolomics was used to analyze the metabolites of 2 silkworm strains with different pesticide resistance levels at 6,12,and 24 h after feeding with fenpropathrin.Twenty-six of 27 metabolites showed significant differences after fenpropathrin treatment and were classified into 6 metabolic pathways:glycerophospholipid metabolism,sulfur metabolism,glycolysis,amino acid metabolism,the urea cycle,and the tricarboxylic acid(TCA)cycle.After analyzing the percentage changes in the metabolic pathways at the 3 time points,sulfur metabolism,glycolysis,and the TCA cycle showed significant responses to fenpropathrin.Confirmatory experiments were performed by feeding silkworms with key metabolites of the 3 pathways.The combination of iron(II)fumarate+folic acid(IF-FA)enhanced fenpropathrin resistance in silkworms 6.38 fold,indicating that the TCA cycle is the core pathway associated with resistance.Furthermore,the disruption of several energy-related metabolic pathways caused by fenpropathrin was shown to be recovered by IF-FA in vitro.Therefore,IF-FA may have a role in boosting silkworm pesticide resistance by modulating the equilibrium between the TCA cycle and its related metabolic pathways.
文摘The degradation rates of fenpropathrin, phoxim and their mixture in un sterilized soil were much quicker than those in sterilized soil, which indicated that soil microorganisms played a significant role in the degradation process in soil. The half life (T 0.5 ) in un sterilized soil was 56.2 d for fenpropathrin, 57.8 d for mixed fenpropathrin, 48.2 d for phoxim, and 41.7 d for mixed phoxim. The corresponding half life (T 0.5 ) in sterilized soil was 135.1 d, 147.3 d, 123.6 d, and 126.2 d, respectively. There were no significant differences for degradation rates between single use and mixed use of fenpropathrin and phoxim.
