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Nighat Perveen, Munir Ahmad
Quantitative studies concerning total and differential haemocyte counts and abnormalities were performed under laboratory conditions for larvae, pupae and adults collected from a wild Apis dorsata colony. Haemolymph samples were observed immediately, thirty and sixty minutes after field recommended concentration exposure of five different insecticides. Total haemocyte counts were significantly higher for larvae and pupae but less for adult bees, however, differential haemocyte counts insignificantly different...
July 2017: Saudi Journal of Biological Sciences
Feng Jiang, Yixi Zhang, Huahua Sun, Xiangkun Meng, Haibo Bao, Jichao Fang, Zewen Liu
As one of the most important predatory enemies, the miridbug, Cyrtorhinus lividipennis, plays an important role in rice planthoppers control, such as Nilaparvata lugens (brown planthopper). In order to compare insecticide selectivity between C. lividipennis and N. lugens, the contact acute toxicities of six insecticides (diazoxon, paraoxon, carbaryl, fenobucarb, fipronil and ethofenprox) were monitored. The results showed that all tested insecticides were more toxic to C. lividipennis than to N. lugens and fipronil had the biggest difference...
January 2015: Pesticide Biochemistry and Physiology
Xiude Hua, Xiaofeng Liu, Wei Yin, Yazhong Xia, Qiujun Zhou, Yiwen Lu, Wei Li, Haiyan Shi, Fengquan Liu, Minghua Wang
A sensitive monoclonal antibody-based enzyme monoclonal antibody-based enzyme-linked immunosorbent assay (ELISA) was developed to detect bifenthrin in a chemical soil barrier for termite control. LBc ((2-methyl[1,1-biphenyl]-3-methoxy) carbonyl propionic acid) was conjugated to bovine serum albumin (BSA) for producing monoclonal antibody. After optimization, the IC50 and limit of detection (LOD, IC10) were 0.05 mg L(-1) and 0.004 mg L(-1), respectively. The sensitivity was improved 40-fold compared to polyclonal antibody-based ELISA reported earlier...
January 1, 2015: Science of the Total Environment
Dali Sun, Li Li, Hongwu Liang, Wei Li, Ran Ji, Yijun Wu, Chenglan Liu
The dissipation of ethofenprox in cabbage and soil under open conditions was investigated at two primary cabbage-growing regions, Beijing and Kunming in China. Samples were extracted with acetonitrile and determined by ultra-performance liquid chromatography with a single quadrupole detector. Dissipation of ethofenprox from cabbage and soil can be best explained by a first-order decay process. The half-lives of ethofenprox were 1.9 and 2.3 days in cabbage and 20.0 and 13.0 days in soil at Beijing and Kunming, respectively...
September 2012: Environmental Monitoring and Assessment
Jiaheng Zhang, Haixiang Gao, Bing Peng, Songqing Li, Zhiqiang Zhou
This research paper presents a comparative study of the performance of conventional, ultrasound-assisted (UA), and temperature-controlled (TC) ionic liquid (IL) dispersive liquid-phase microextraction (IL-DLLME). Various parameters that affect extraction efficiency, such as type and volume of extraction and disperser solvent, centrifugation time, salt addition, effect of temperature on TC-IL-DLLME, and effect of sonication time on UA-IL-DLLME, were evaluated. UA-IL-DLLME was found to provide the best extraction efficiency...
September 23, 2011: Journal of Chromatography. A
Tatsuya Yoshimi, Koji Odagiri, Yutaka Hiroshige, Shin-ichi Yokobori, Yuji Takahashi, Yoshio Sugaya, Takashi Miura
Several species of invertebrates have been studied to examine the toxicological effects of chemicals that include insecticides and heavy metals. We characterized heat-shock protein (hsp) genes from the ubiquitous midge, Chironomidae. More than 70 fold induction of hsp70 expression was detected by quantitative PCR after 37°C treatment in the midge. Expression of hsp70 was induced not only by heat but also by exposure to insecticides and heavy metals such as cadmium and copper. Expression time courses for hsp70 were highly specific to each chemical...
September 2009: Environmental Toxicology and Pharmacology
G Preetha, J Stanley, S Suresh, R Samiyappan
The green miridbug, Cyrtorhinus lividipennis, an important natural enemy of the rice brown planthopper (BPH), Nilaparvata lugens plays a major role as a predator in suppressing the pest population. The study assessed the impact of certain potential insecticides used in the rice ecosystem on the miridbug predator and brown planthopper through contact toxicity. Eleven insecticides, including neonicotinoids, diamides, azomethine pyridines, carbamates, pyrethroids, organophosphates and cyclodienes were selected to test their toxicities against the nymphs of C...
July 2010: Chemosphere
Rania Abdou, Kazuaki Sasaki, Waleed Khalil, Syed Shah, Youhei Murasawa, Minoru Shimoda
Four commonly used pyrethroids (permethrin, bifenthrin, ethofenprox, and fenpropathrin) were orally administered to Sprague-Dawley rats for 5 days to study their effects on the liver cytochrome P450 (CYP) activities. Also Michaelis-Menten kinetics of the metabolic reactions catalyzed by liver CYPs were examined after adding these pyrethroids to the assay system to investigate their possible inhibitory effects on liver CYPs activities. These reactions included ethoxyresorufin O-deethylation, tolbutamide hydroxylation, bufuralol 1'-hydroxylation, and midazolam 4-hydroxylation, for CYP1A, 2C, 2D, and 3A activities, respectively...
April 2010: Journal of Veterinary Medical Science
Jian Wang, Daniel Leung
A liquid chromatographic/electrospray ionization-tandem mass spectrometric method was developed and validated to determine 142 pesticides in fruit- and vegetable-based infant foods, including apples, apples and bananas, pears, bananas, apple juice, peas, sweet potatoes, creamed corn, squash, and carrots. Pesticides were extracted from infant foods by using the procedure known as the quick, easy, cheap, effective, rugged, and safe (QuEChERS) method. Quantification was based on matrix-matched standard calibration curves with the use of an isotopically labeled standard or a chemical analogue as the internal standard to obtain method accuracy...
January 2009: Journal of AOAC International
Zhi-Yong Zhang, Dong-Lan Wang, Zhi-Juan Chi, Xian-Jin Liu, Xiao-Yue Hong
Acute toxicities of two organophosphorus insecticides (dichlorvos and phoxim), four pyrethroid insecticides (permethrin, tetramethrin, bifenthrin, and ethofenprox), and their combined uses to the third instar of the silkworm, Bombyx mori (L.), were determined by feeding the insect with the insecticide-treated mulberry, Morus albus (L.), leaves. Twenty-four and 48 h after treatment, toxicity levels of all insecticides to the silkworm were in the very high or high range, and the LC50 values of permethrin, tetramethrin, bifenthrin, ethofenprox, dichlorvos, and phoxim were 1...
April 2008: Journal of Economic Entomology
Tatsuya Yoshimi, Kozue Minowa, Natalie K Karouna-Renier, Chiharu Watanabe, Yoshio Sugaya, Takashi Miura
Stress proteins (heat shock proteins, HSPs) have been proposed as general biomarkers for environmental monitoring. In the present study, we evaluated the environmental stress-burden on the aquatic midge Chironomus yoshimatsui using hsp70 expression. Larvae collected from streams receiving polluted runoff (field strain) were resistant to the organophosphorus insecticide, fenitrothion (F), and the synthetic pyrethroid, ethofenprox (E), whereas a strain originally collected from an unpolluted area (susceptible strain) showed low resistance to insecticide exposure...
2002: Journal of Biochemical and Molecular Toxicology
Y Takada, S Kawamura, T Tanaka
The toxicity of six insecticides, acephate, methomyl, ethofenprox, cartap, chlorfluazuron, and Bacillus thuringiensis (Bt) was tested on different developmental stages of the egg parasitoid, Trichogramma dendrolimi (Matsumura). Each of the insecticides tested showed different degrees of toxicity to the parasitoid, Ethofenprox showed the highest toxicity and cartap showed relatively higher toxicity compared with the other insecticides. The development of the parasitoids treated with these two insecticides was normal, similar to that of the control group...
December 2001: Journal of Economic Entomology
M Nakamura, T Igarashi, S Yamada, S Aizawa
Ethofenprox (pesticide) exhibits a relatively strong fluorescence in the UV region. Its fluorescence properties were investigated in aqueous solution, organic solvents, and micellar media. The fluorescence intensity of Ethofenprox was enhanced by a factor of 1.2 to 2.7 in the presence of surfactants and by 1.4 in pure organic solvents without significant shift of the excitation and emission wavelengths. The conditions for solid-phase extraction of Ethofenprox from water samples were examined. Among the solid-phase extraction cartridges studied, a Sep Pak C8 with weak sorption ability was found to be the most useful due to the extremely high hydrophobicity of Ethofenprox...
August 2000: Fresenius' Journal of Analytical Chemistry
R Baktharatchagan, B V David
Ethofenprox (Trebon), a new compound, was evaluated against three species of mosquito larvae in the laboratory. Larval LC50 values revealed that Culex quinquefasciatus was more susceptible than Ae. aegypti and An. stephensi. The residual toxicity of Trebon was studied against culicine larvae in the rice agroecosystem at rates ranging from 0.05 to 0.2 kg ai/ha. Effective control was obtained for even beyond five weeks at the larvicidal rate of 0.2 kg ai/ha. Trebon is not safe to nontarget aquatic organisms.
December 1991: Indian Journal of Malariology
L S Putintsev, V P Dremova, V V Labzin, F V Gitsu, E V Dem'ianov
The insecticidal action of the new compound ethofenprox (trebon) in the form of 10 and 30% flow concentrate against house flies, cockroaches, bed bugs, rat fleas, mosquito imagines and larvae of Aedes and Culex genera was studied in the laboratory and in the field. The effective doses and the methods of spraying were established. 10% flow trebon is allowed by the USSR Ministry of Health to be useful in medical disinfection.
July 1992: Meditsinskaia Parazitologiia i Parazitarnye Bolezni
S A Roslavtseva, S N Smirnova, E S Butyrina, I N Kostyrko, Iu V Poliakova
The resistance to chlorophos and some pyrethroids (permethrin, fenvalerate and ethofenprox) were determined in house fly imagos from Moscow, some towns of the Moscow Province (Dmitrov, Kolomna, Zagorsk and others). Tajikistan, Turkmenia and also Czechoslovakia. The tested populations from the USSR were highly resistant to chlorophos (more than 100 times) and susceptible or tolerant to pyrethroids. Czechoslovak populations were more resistant to pyrethroids.
January 1992: Meditsinskaia Parazitologiia i Parazitarnye Bolezni
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