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1. Sorption, desorption and mobility characteristics of a novel fungicide pyrazoxystrobin in three agricultural soils | |||
Liu Xunyue,Ding Xingcheng | |||
Agronomy 20 January 2012 | |||
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Abstract:Pyrazoxystrobin, (E)-methyl 2-(3-((3-(4-chlorophenyl)-1-methyl- 1H -pyrazol-5-yloxy) methyl) phenyl) -3 - methoxyacrylate, is a novel fungicide developed in China. The adsorption, desorption and mobility characteristics of pyrazoxystrobin on three agricultural soils were studied by using 14C labeled compound. The adsorption of pyrazoxystrobin in soils was correlated to soil organic matter content and soil pH and the sorption has been observed in the order of S2>S1>>S3. Desorption was reflect some of the interactions involved between the pesticides and the soil components, soil pH seems to more influence to pyrazoxystrobin desorption and only about 2.54 to 6.41% of adsorbed pyrazoxystrobin was released. The mobility result, minimum of 95.02% compound residued in the upper 4.0 cm layer, demonstrated the use of pyrazoxystrobin as a fungicide is likely to be safe to groundwater. | |||
TO cite this article:Liu Xunyue,Ding Xingcheng. Sorption, desorption and mobility characteristics of a novel fungicide pyrazoxystrobin in three agricultural soils[OL].[20 January 2012] http://en.paper.edu.cn/en_releasepaper/content/4463029 |
2. The effects of luteolin on phenoloxidase and the growth of Spodotera exigua (Hübner) larvae (Lepidoptera: Noctuidae) | |||
Xue Chaobin,Luo Wanchun | |||
Agronomy 14 December 2010 | |||
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Abstract:The effects of luteolin on phenoloxidase (PO) from Spodotera exigua larvae were investigated with the use of a microtitration assay in the present paper. The results showed that luteolin could inhibit the activity of PO and concentration of this inhibitor that led to a 50% (IC50) activity reduction was estimated to be 0.47 mmol/L. The inhibitory kinetics was analyzed by Lineweaver-Burk plots and the compound was found to be a reversible competitive inhibitor with the Ki of 13.11 mmol/L. The compound was obviously toxic against the larvae (≤3rd instar) of Spodoptera exigua. The highest inhibitory percentage in the older larvae (≥3rd instar) was greater than 60% with luteolin treatment. The pupation rate and percentage of eclosion was also evidently reduced with luteolin treatment by the ingestion method in this investigation. | |||
TO cite this article:Xue Chaobin,Luo Wanchun. The effects of luteolin on phenoloxidase and the growth of Spodotera exigua (Hübner) larvae (Lepidoptera: Noctuidae)[OL].[14 December 2010] http://en.paper.edu.cn/en_releasepaper/content/4397554 |
3. Prophenoloxidase-1 (PPO1) cDNA clone and its expression in Diamondback moth Plutella xylostella | |||
Xue Chaobin,Luo Wanchun | |||
Agronomy 10 December 2010 | |||
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Abstract:Phenoloxidase (PO) is a key enzyme in insect development, responsible for catalyzing the hydroxylation of tyrosine into o-diphenols and the oxidation of o-diphenols into o-quinones. In this paper, the prophenoloxidase-1 (PxPPO1) cDNA of Plutella xylostella was cloned by means of reverse transcription polymerase chain reaction (RT-PCR) and rapid amplification of cDNA ends (RACE). The full-length cDNA consisted of 2838bp, containing an open reading frame (ORF) of 2049bp which encoding 682 amino acids. The molecular mass of the deduced amino acids and the active enzyme was predicted to be 78.56kDa and 72.65 kDa, respectively. The calculated pI was 6.43. BLASTp search and neighbor-joining analysis showed that the deduced amino acid sequence had a high identity to the published sequence of PPO1 from other lepidopterous insects, ranging from 70.5% to 74.6%. Protein signature analysis revealed three conserved regions, including the two copper binding sites characteristic of arthropod PPOs. Semi-quantitative RT-PCR and Real-time PCR indicated that the highest amount of PxPPO1 transcripts in eggs or the 4th instar larvae, followed by the 2nd, the 3rd instar larvae, prepupae and pupa. | |||
TO cite this article:Xue Chaobin,Luo Wanchun. Prophenoloxidase-1 (PPO1) cDNA clone and its expression in Diamondback moth Plutella xylostella[OL].[10 December 2010] http://en.paper.edu.cn/en_releasepaper/content/4396723 |
4. Design, Synthesis and QSAR of Novel 4-(3-trifluoro methylphenyl)-6-methyl-2-arylpyridazin-3(2H)-ones | |||
zhu you-quan,hu xu hong,zhang jin,yuan yan-wei,xu han,zou xiao-mao,hu fang-zhong,yang hua-zheng | |||
Agronomy 29 December 2009 | |||
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Abstract:A series of novel 4-(3-trifluoromethylphenyl)-6-methyl-2-arylpyridazin-3(2H)-ones derivatives were designed, synthesized and evaluated for their bioactivities. Some of them provided > 80 % inhibition of chlorophyll of Spirodela polyrrhiza at 10 μg/ml and and exhibited good herbicidal activities against Digitaria Adscendens at pre-emergence treatment at a dosage of 150 g/ha. Quantitative structure–activity relationship studies were performed on these compounds using physicochemical parameters (electronic, steric) as independent and chlorophyll inhibiting activity as dependent parameter, where chlorophyll inhibiting activity correlated best (r>0.8) with steric(Es ), indicator(HM), van der Waals volume (VN), electronic parameter(σm, σp) in this set of molecules. | |||
TO cite this article:zhu you-quan,hu xu hong,zhang jin, et al. Design, Synthesis and QSAR of Novel 4-(3-trifluoro methylphenyl)-6-methyl-2-arylpyridazin-3(2H)-ones[OL].[29 December 2009] http://en.paper.edu.cn/en_releasepaper/content/38239 |
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