The fate of fenitrothion in rice- fish ecosystem was studied using C- fenitrothion (14C- F) labelled at methoxyl and two application rates. The fenitrothion in water disappeared quickly, only 8 and 11 ppb in two treat...The fate of fenitrothion in rice- fish ecosystem was studied using C- fenitrothion (14C- F) labelled at methoxyl and two application rates. The fenitrothion in water disappeared quickly, only 8 and 11 ppb in two treatments at harvest were detected respectively. Most of 14C-F in soil existed in upper layer and that in plants appeared in shoots. The extractable residues in cargo rice were 0.36 and 0.58 ppm in two treatments respectively. 14C- residues (14C- R) were concentrated in bones, next viscera, meat and scales. Total 14C-R in meat were 0.92 and 1.77 ppm at harvest. Comparing two treatments, the residue dynamics of fenitrothion in water, soil, plants and fish were similar. 14C- R in water and soil after harvest affected the rice- fish ecosystem in the next season. However, the extractable 14C- R in cargo rice, soil and water were very low. Fenitrothion 14C- fenitrothion Rice- fish Model展开更多
Residues of 14C--f e.itrothio. in a model rice--fish ecosystem and field rice--fish ecosystem were studied. When equal amounts of the pesticide were applied, the extractable residues in brown rice (equivalent to 34.3f...Residues of 14C--f e.itrothio. in a model rice--fish ecosystem and field rice--fish ecosystem were studied. When equal amounts of the pesticide were applied, the extractable residues in brown rice (equivalent to 34.3f 1.9 μg / kg fenitrothion) and rice stems and leaves (20.9± 1.5 μg / kg) of the model rice-fish ecosystem were 10-15times higher than that of the field rice-fish ecosystem(4.48 ± 0.13 μg / kg and 1.27 ±0.34 μg / kg respectively). Residues in upper part of the soil (6.50± 0.1- 8.10±0.2 μg / kg) and lower part of the soil (1.30± 0.1-1.50±0.1μg / kg) of the model rice-fish ecosystem were 10-40 times higher than that of the field rice-fish ecosystem (0.17 ±0.01 μg / kg). The extractable residues in paddy water of the model ecosystem (0.30 ± 0.01 μg / kg) were similar to that of the field ecosystem (0.20 ± 0.02 μg / kg). Whenthe fenitrothion was sprayed on the rice plants, residues in brown rice, fish body, soiland paddy water were lower than those when the pesticide was sprayed on the surfaceof the soil.展开更多
为了研究低剂量杀螟硫磷(fenitrothion-O-analog,FNT)暴露对大鼠肝细胞(buffalo rat liver cells,BRL)的代谢毒性,并通过作用于体外的一系列指标分析其作用机制,分别对空白对照组和杀螟硫磷暴露组(13.78、27.55、55.10μg·mL-1)暴...为了研究低剂量杀螟硫磷(fenitrothion-O-analog,FNT)暴露对大鼠肝细胞(buffalo rat liver cells,BRL)的代谢毒性,并通过作用于体外的一系列指标分析其作用机制,分别对空白对照组和杀螟硫磷暴露组(13.78、27.55、55.10μg·mL-1)暴露48 h,观察其对BRL内糖代谢、胰岛素敏感和糖原合成信号通路中蛋白表达的影响。实验结果表明,杀螟硫磷暴露能够显著抑制BRL细胞的活力,半数抑制浓度(IC50)为275.5μg·mL-1。杀螟硫磷暴露使超氧化物歧化酶(superoxide dismutase,SOD)和乙酰胆碱酯酶AchE活力显著降低(P<0.01),其体内丙二醛(malonaldehyde,MDA)含量显著增加(P<0.01),引起细胞氧化损伤。杀螟硫磷暴露使其细胞内糖原、胰岛素和葡萄糖激酶含量显著降低(P<0.01),增加胰岛素抵抗。杀螟硫磷暴露显著下调胰岛素敏感信号通路中IRS的表达,抑制IRS的磷酸化,并显著上调AKT和PI3K的表达,显著上调糖原合成信号通路中GSK-3α和GSK-3β的表达。因此,杀螟硫磷暴露使BRL产生糖代谢毒性的机制是通过氧化应激诱发胰岛素抵抗,从而改变糖代谢相关信号通路中蛋白的表达而实现的。展开更多
To control Monochamus alternatus and its amount of population is one of the effective ways on controlling Bursaphelechus xylophilus.The Japanese black pine which were badly harmed by M.alternatus were sprayed with the...To control Monochamus alternatus and its amount of population is one of the effective ways on controlling Bursaphelechus xylophilus.The Japanese black pine which were badly harmed by M.alternatus were sprayed with the ditution from diluting fenitrothion · buprofezen 50%EC with water to 100 times, 200 times and 300 times. In this trial, the treatment is divided into two groups: one is of the different concentration but the same object (trees in the forest), the other is of the same concentration but different environmental condition (trees in the forest and felling trees indoor). Each treatment repeated five times. In the meantime, the check is not treated. After twice trial, the result indicated that the mortality rate of M. alternatus is 71 33%, 52 31% and 37 82% in the condition that trees in the forest were sprayed with the 100 times, 200 times and 300 times fenitrothion·buprofezen, and 69 69% in the condition that the felling trees indoor were spraded with 100 times fenitrothion·buprofezen, but the mortality rate of the check is only 8 92%. By this trial, it was also found that the dead adults of M.alternatus laid in the entrance of emergance hole, so enhancing the somatic character of fenitrothion · buprofezen can enhance the injury ratio of larva and pupae of M.alternatus.展开更多
文摘The fate of fenitrothion in rice- fish ecosystem was studied using C- fenitrothion (14C- F) labelled at methoxyl and two application rates. The fenitrothion in water disappeared quickly, only 8 and 11 ppb in two treatments at harvest were detected respectively. Most of 14C-F in soil existed in upper layer and that in plants appeared in shoots. The extractable residues in cargo rice were 0.36 and 0.58 ppm in two treatments respectively. 14C- residues (14C- R) were concentrated in bones, next viscera, meat and scales. Total 14C-R in meat were 0.92 and 1.77 ppm at harvest. Comparing two treatments, the residue dynamics of fenitrothion in water, soil, plants and fish were similar. 14C- R in water and soil after harvest affected the rice- fish ecosystem in the next season. However, the extractable 14C- R in cargo rice, soil and water were very low. Fenitrothion 14C- fenitrothion Rice- fish Model
文摘Residues of 14C--f e.itrothio. in a model rice--fish ecosystem and field rice--fish ecosystem were studied. When equal amounts of the pesticide were applied, the extractable residues in brown rice (equivalent to 34.3f 1.9 μg / kg fenitrothion) and rice stems and leaves (20.9± 1.5 μg / kg) of the model rice-fish ecosystem were 10-15times higher than that of the field rice-fish ecosystem(4.48 ± 0.13 μg / kg and 1.27 ±0.34 μg / kg respectively). Residues in upper part of the soil (6.50± 0.1- 8.10±0.2 μg / kg) and lower part of the soil (1.30± 0.1-1.50±0.1μg / kg) of the model rice-fish ecosystem were 10-40 times higher than that of the field rice-fish ecosystem (0.17 ±0.01 μg / kg). The extractable residues in paddy water of the model ecosystem (0.30 ± 0.01 μg / kg) were similar to that of the field ecosystem (0.20 ± 0.02 μg / kg). Whenthe fenitrothion was sprayed on the rice plants, residues in brown rice, fish body, soiland paddy water were lower than those when the pesticide was sprayed on the surfaceof the soil.
文摘To control Monochamus alternatus and its amount of population is one of the effective ways on controlling Bursaphelechus xylophilus.The Japanese black pine which were badly harmed by M.alternatus were sprayed with the ditution from diluting fenitrothion · buprofezen 50%EC with water to 100 times, 200 times and 300 times. In this trial, the treatment is divided into two groups: one is of the different concentration but the same object (trees in the forest), the other is of the same concentration but different environmental condition (trees in the forest and felling trees indoor). Each treatment repeated five times. In the meantime, the check is not treated. After twice trial, the result indicated that the mortality rate of M. alternatus is 71 33%, 52 31% and 37 82% in the condition that trees in the forest were sprayed with the 100 times, 200 times and 300 times fenitrothion·buprofezen, and 69 69% in the condition that the felling trees indoor were spraded with 100 times fenitrothion·buprofezen, but the mortality rate of the check is only 8 92%. By this trial, it was also found that the dead adults of M.alternatus laid in the entrance of emergance hole, so enhancing the somatic character of fenitrothion · buprofezen can enhance the injury ratio of larva and pupae of M.alternatus.
