检索结果-南通市图书馆

Chinese Chemical Letters 2008年第1期19卷 95-98页

作者： Qing Xiang Zhou Guo Hong Xie Jun Ping Xiao Wei Dong Wang Yu Jie Ding School of Chemistry and Environmental Sciences Henan Normal University Henan Key Laboratory for Environmental Pollution Control Key Laboratory for Yellow River and Huaihe River Water Environment and Pollution Control Ministry of Education Xinxiang 453007 China College of Resources and Environment Henan Institute of Science and Technology Xinxiang 453003 China Department of Chemistry University of Science and Technology Beijing Beijing 100083 China

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.

关键词： Multiwalled carbon nanotubes Fenpropathrin cyhalothrin Deltamethrin High performance liquid chromatography

Effect of copper on the degradation of pesticides cypermethrin and cyhalothrin

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2007年第10期19卷 1235-1238页

作者： LIU Ting-feng SUN Cheng TA Na HONG Jun YANG Shao-gui CHEN Chuan-xiang State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Nanfing 210093 China School of Material Science and Engineering Jiangsu University of Scienee and Technology Zhenjiang 212003 China

The influence of coexisting copper （Cu） ion on the degradation of pesticides pyrethroid cypermethrin and cyhalothrin in soil and photodegradation in water system were studied. Serial concentrations of the pesticides with the addition of copper ion were spiked in the soil and incubated for a regular period of time, the analysis of the extracts from the soil was carded out using gas chromatography （GC）. The photodegradation of pyrethroids in water system was conducted under UV irradiation. The effect of Cu^2＋ on the pesticides degradation was measured with half life 00.5） of degradation. It was found that a negative correlation between the degradation of the pyrethroid pesticides in soil and Cu addition was observed. But Cu^2＋ could accelerate photodegradation of the pyrethroids in water. The t0.5 for cyhalothrin extended from 6.7 to 6.8 d while for cypermethrin extended from 8.1 to 10.9 d with the presence of copper ion in soil. As for photodegradation, t0.5 for cyhalothrin reduced from 173.3 to 115.5 min and for cypermethrin from 115.5 to 99.0 min. The results suggested that copper influenced the degradation of the pesticides in soil by affecting the activity of microorganisms. However, it had catalyst tendency for photodegradation in water system. The difference for the degradation efficiency of pyrethroid isomers in soil was also observed. Copper could obviously accelerate the degradation of some special isomers.

关键词： degradation photodegradation copper cypermethrin cyhalothrin

Pertussis toxin modulation of sodium channels in the central neurons of cyhalothrin-resistant and cyhalothrinsusceptible cotton bollworm, Helicoverpa armigera

在线全文

学校读者我要写书评

暂无评论

Insect Science 2007年第2期14卷 107-115页

作者： QIANG ZHAO DE-LING KONG BING-JUN HE YAN-QIANG LIU XIAN-LIN FAN AN-XI LIU Key Laboratory of Bioactive Materials Ministry of Education College of Life Sciences Nankai University Tianjin Institute of Plant Protection Chinese Academy of Agricultural Sciences Beijing China

Pertussis toxin （FIX） inhibits the activation of the α-subunit of the inhibitory heterotrimeric G-proteins （Cαi/o） and modulates voltage-gated sodium channels, which may be one of the primary targets of pyrethroids. To investigate the potential mechanisms of agricultural pests resistance to pyrethroid insecticides, we examined the modulations by PTX on sodium channels in the central neurons of the 3rd-4th instar larvae of cyhalothrin-resistant （Cy-R） and cyhaiothrin-susceptible （Cy-S） Helicoverpa armigera by the whole-cell patch-clamp technique. The isolated neurons were cultured for 12-16 h in an improved L15 insect culture medium with or without PTX （400 ng/mL）. The results showed that both the Cy-R and Cy-S sodium channels exhibited fast kinetics and tetrodotoxin （TTX） sensitivity. The Cy-R sodium channels exhibited not only altered gating properties, including a 8.88-mV right shift in voltage-dependent activation （V0.5act） and a 6.54-mV right shift in voltage-dependent inactivation （V0.5inact）, but also a reduced peak in sodium channel density （Ⅰdensity）（55.2% of that in Cy-S neurons）. Cy-R sodium channels also showed low excitability, as evidenced by right shift of activation potential （Ⅴacti） by 5-10 mV and peak potential （Ⅴpcak） by 20 mV. FIX exerted significant effects on Cy-S sodium channels, reducing sodium channel density by 70.04%, right shifting V0.5act by 14.41 mV and V0.5inact by 9. 38 mV. It did not cause any significant changes of the parameters mentioned above in the Cy-R sodium channels. The activation time （Tpeak） from latency to peak at peak voltage and the fast inactivation time constant （τinact） in both Cy-S and Cy-R neurons were not affected. The results suggest that cotton bollworm resistant to pyrethroid insecticides involves not only mutations and allosteric alterations of voltage-gated sodium channels, but also might implicate perturbation of PTX-sensitive Gαi/o-COupled signaling Wansduction pathways.

关键词： cyhalothrin G proteins Helicoverpa armigera insecticide resistant neuron pertussis toxin sodium channels whole-cell patch-clamp technique

Effects of cyhalothrin on the transient outward potassium current in central neurons of Helicoverpa armigera

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2006年第1期13卷 13-17页

作者： YONG WANG BING-JUN HE QIANG ZHAO ZHI LIANG AN-XI LIU College of Life Science Nankai Univerity Tianjin China

The effects of cyhalothrin on the transient outward potassium current in central neurons of Helicoverpa armigera were studied by using the patch clamp techniques. The results showed that before using cyhalothrin （10.5 mmol/L）, activation potential was approximately -40 mV, after application of the drug, the activation potential shifted roughly 10 mV to the negative potential direction, so channels can be activated more easily. Before and after cyhalothrin application, the change of current amplitude was insignificant. The value of V1/2 and k of activation curves did not change significantly, however, the V1/2 of the inactivation curves changed significantly. Inactivation curves significantly shifted to a negative direction, so that inactivation of the channels was hastened. It is indicated that there may exit a primary way in which cyhalothrin provides neurotoxicity to the nervous system through the regulation of activation potentials and inactivation state of IA channels.

关键词： cyhalothrin Helicoverpa armigera patch clamp potassium channel

INHERITANCE OF RESISTANCE TO cyhalothrin IN THE HOUSEFLY(DIPTERA:MUSCIDAE)

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Entomologia Sinica 2002年第1期9卷 51-54页

作者：朱福兴袁建忠庄佩君唐振华中国科学院上海生命科学研究院上海生理生态研究所

The genetic inheritance of resistance to cyhalothrin in housefly, Musca domestica (L) was investigated. Reciprocal crosses between susceptible (S) and resistant (R) strains were used to determine the characteristics of resistance. Analysis of probit line from the F 1 generation and F 2 generation obtained by inbreeding the F 1 hybrids indicated that cyhalothrin resistance was controlled by more than one factors and degree of resistance dominance to cyhalothrin was -0.10, indicating cyhalothrin resistance is conferred by incompletely recessive gene(s). The realized heritability of resistance to cyhalothrin cyhalothrin calculated from data collected routinely from laboratory selection was 0 12.

关键词： House fly cyhalothrin resistance inheritance

在线全文

学校读者我要写书评

暂无评论

应用GC-MS测定葡萄中的5种农药残留

分析测试学报 2004年第z1期23卷 242-243,248页

作者：秦曙乔雄梧王霞周华山西省农科院植保所山西省农药重点实验室山西太原030031

　　酿酒葡萄是河北昌黎的主要水果种植品种,由于受海洋气候的影响,当地空气湿热,葡萄病害十分严重,因而农药使用十分频繁,为了评价其农药残留水平,我们采用丙酮提取,凝胶分离,硅胶小柱净化,GC-MS的选择离子方式检测对采集的葡萄样品进... 详细信息

　　酿酒葡萄是河北昌黎的主要水果种植品种,由于受海洋气候的影响,当地空气湿热,葡萄病害十分严重,因而农药使用十分频繁,为了评价其农药残留水平,我们采用丙酮提取,凝胶分离,硅胶小柱净化,GC-MS的选择离子方式检测对采集的葡萄样品进行5种农药(百菌清、精甲霜灵、苯醚甲环唑、嘧菌酯、高效氯氟氰菊酯)的残留分析.……

关键词： GC - MS SIM Grape Residue Chlorothalonil Difenoconazole Azoxystrobin Metalaxyl - M cyhalothrin

在线全文

学校读者我要写书评

暂无评论

应用GC-MS测定葡萄中的5种农药残留

应用GC-MS测定葡萄中的5种农药残留