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https://www.readbyqxmd.com/read/28731614/economic-injury-levels-and-economic-thresholds-for-leptoglossus-zonatus-dallas-hemiptera-coreidae-infesting-seed-maize
#1
Josemar Foresti, Cristina S Bastos, Flávio L Fernandes, Paulo R da Silva
BACKGROUND: Although Leptoglossus zonatus is considered a secondary pest of maize grown for grain, when grown for seed, this pest can cause significant economic damage. There are no records of management recommendations for this pest. The objectives of this work were to quantify losses caused by L. zonatus to different genotypes used for seed maize production and to estimate the acute toxicity of select insecticides to L. zonatus using different application technologies. The ultimate goal was to calculate economic injury levels (EILs) and develop economic thresholds (ETs) for L...
July 21, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28722808/an-examination-of-the-effect-of-aerosolized-permanone-insecticide-on-zebra-finch-susceptibility-to-west-nile-virus
#2
Mark D Jankowski, Murray E Moore, Erik K Hofmeister
West Nile virus is primarily maintained cryptically primarily in avian (Passerine) populations where it is transmitted by Culex spp. mosquitoes. Mosquito control measures currently include physical activities to reduce mosquito breeding sites, the application of mosquito larvicides, or aerosolized insecticides to kill adults (adulticides) when arboviral diseases such as West Nile virus (WNV) or Zika virus are detected in mosquito populations. Organochlorine, organohosphorus, carbamate and pyrethroid insecticides are often used...
July 19, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28722781/contribution-of-pyrethroids-in-large-urban-rivers-to-sediment-toxicity-assessed-with-benthic-invertebrates-chironomus-dilutus-a-case-study-in-south-china
#3
Fei Cheng, Huizhen Li, Hongxue Qi, Qian Han, Jing You
The importance of pyrethroids as potential stressors to benthic organisms has gradually become evident in urban creeks, however, the occurrence and toxicity of sediment-associated pyrethroids are rarely studied in large rivers. In this context, ten sediments from a large urban river (Guangzhou reach of the Pearl River in China) were assessed for pyrethroid occurrence and sediment toxicity to the benthic invertebrate Chironomus dilutus. Half of the sediments exhibited lethality to C. dilutus in a 10-d exposure and all survived midges showed significant change of enzymatic activity...
July 19, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28714540/anti-feeding-and-insecticidal-efficacy-of-a-topical-administration-of-dinotefuran-pyriproxyfen-permethrin-spot-on-vectra%C3%A2-3d-on-mice-against-stegomyia-albopicta-%C3%A2-aedes-albopictus
#4
D Tahir, B Davoust, L Almeras, J M Berenger, M Varloud, P Parola
An ectoparasiticide combining three active ingredients [dinotefuran, permethrin and pyriproxyfen (DPP)] was used in mice in an experiment designed to evaluate its anti-feeding and insecticidal efficacy against Stegomyia albopicta (= Aedes albopictus) (Diptera: Culicidae) mosquitoes. Twenty-two adult mice were randomly allocated into two groups consisting of an untreated control group and a DPP-treated group. Mice were exposed individually for 1 h to a mean ± standard deviation of 27 ± 2 starved female mosquitoes on days 1, 7, 14, 21 and 28 post-treatment...
July 17, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28708331/negative-chemical-ionization-gas-chromatography-mass-spectrometry-of-transfluthrin-in-rat-plasma-and-brain
#5
Shirin Hooshfar, Tanzir B Mortuza, Clinton A Rogers, Michael R Linzey, Darren R Gullick, James V Bruckner, Catherine A White, Michael G Bartlett
RATIONALE: Transfluthrin is a relatively non-toxic rapid-acting synthetic pyrethroid insecticide. It is widely used in household and hygiene products. A sensitive and accurate bioanalytical method is required for quantification of its concentration in plasma and its potential target organ, the brain for studies to assess its health effects and toxicokinetics in mammals. METHODS: The samples were prepared by liquid-liquid extraction. Gas chromatography mass spectrometry (GC/MS) analysis was performed for the determination of transfluthrin in biological samples with an overall method run time of 15 min...
July 14, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28681389/untargeted-metabolomics-of-neuronal-cell-culture-a-model-system-for-the-toxicity-testing-of-insecticide-chemical-exposure
#6
Sarah Hayton, Garth L Maker, Ian Mullaney, Robert D Trengove
Toxicity testing is essential for the protection of human health from exposure to toxic environmental chemicals. As traditional toxicity testing is carried out using animal models, mammalian cell culture models are becoming an increasingly attractive alternative to animal testing. Combining the use of mammalian cell culture models with screening-style molecular profiling technologies, such as metabolomics, can uncover previously unknown biochemical bases of toxicity. We have used a mass spectrometry-based untargeted metabolomics approach to characterize for the first time the changes in the metabolome of the B50 cell line, an immortalised rat neuronal cell line, following acute exposure to two known neurotoxic chemicals that are common environmental contaminants; the pyrethroid insecticide permethrin and the organophosphate insecticide malathion...
July 6, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28679151/non-target-evaluation-of-contaminants-in-honey-bees-and-pollen-samples-by-gas-chromatography-time-of-flight-mass-spectrometry
#7
E Hakme, A Lozano, M M Gómez-Ramos, M D Hernando, A R Fernández-Alba
This work presents a non-targeted screening approach for the detection and quantitation of contaminants in bees and pollen, collected from the same hive, by GC-EI-ToF-MS. It consists of a spectral library datasets search using a compound database followed by a manual investigation and analytical standard confirmation together with semi-quantitation purposes. Over 20% of the compounds found automatically by the library search could not be confirmed manually. This number of false positive detections was mainly a consequence of an inadequate ion ratio criterion (±30%), not considered in the automatic searching procedure...
June 20, 2017: Chemosphere
https://www.readbyqxmd.com/read/28672725/pyrethroids-in-chicken-eggs-from-commercial-farms-and-home-production-in-rio-de-janeiro-estimated-daily-intake-and-diastereomeric-selectivity
#8
Cláudio E T Parente, Julliana Lestayo, Yago S Guida, Claudio E Azevedo-Silva, João Paulo M Torres, Rodrigo O Meire, Olaf Malm
In this study, pyrethroids were determined in chicken eggs from commercial farm (n = 60) and home egg production (n = 30). These pyrethroids were investigated: bifenthrin, phenothrin, permethrin, cyfluthrin, cypermethrin and fenvalerate, including most diastereomers. Quantification was done using GC-MS in a negative chemical ionization mode. Pyrethroids residues were found in 79% of the analyzed samples. Cypermethrin presented the highest occurrence, being quantified in 62 samples (69%) in concentrations (lipid weight - l w...
June 27, 2017: Chemosphere
https://www.readbyqxmd.com/read/28659758/chronic-oxidative-stress-mitochondrial-dysfunction-nrf2-activation-and-inflammation-in-the-hippocampus-accompany-heightened-systemic-inflammation-and-oxidative-stress-in-an-animal-model-of-gulf-war-illness
#9
Geetha A Shetty, Bharathi Hattiangady, Dinesh Upadhya, Adrian Bates, Sahithi Attaluri, Bing Shuai, Maheedhar Kodali, Ashok K Shetty
Memory and mood dysfunction are the key symptoms of Gulf war illness (GWI), a lingering multi-symptom ailment afflicting >200,000 veterans who served in the Persian Gulf War-1. Research probing the source of the disease has demonstrated that concomitant exposures to anti-nerve gas agent pyridostigmine bromide (PB), pesticides, and war-related stress are among the chief causes of GWI. Indeed, exposures to GWI-related chemicals (GWIR-Cs) and mild stress in animal models cause memory and mood impairments alongside reduced neurogenesis and chronic low-level inflammation in the hippocampus...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28651172/simultaneous-determination-of-cis-permethrin-and-trans-permethrin-in-rat-plasma-and-brain-tissue-using-gas-chromatography-negative-chemical-ionization-mass-spectrometry
#10
Shirin Hooshfar, Darren R Gullick, Michael R Linzey, Tanzir Mortuza, Mona Hamdy Abdel Rahman, Clinton A Rogers, James V Bruckner, Catherine A White, Michael G Bartlett
A sensitive method for the simultaneous determination of cis-permethrin (cis-PERM) and trans-permethrin (trans-PERM) in small volumes (100μL) of rat plasma and brain homogenate was developed, using a liquid-liquid extraction for sample preparation and gas chromatography-negative chemical ionization mass spectrometry (GCNCI-MS) for detection. Quantitation of trace levels of the insecticide in small volumes of biological samples is essential to support toxicokinetic studies in small animals. There are currently no validated methods in the literature for determining cis-PERM and trans- PERM in volumes as low as 100μL of rat plasma or brain homogenate...
June 13, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28650966/insecticide-resistance-to-permethrin-and-malathion-and-associated-mechanisms-in-aedes-aegypti-mosquitoes-from-st-andrew-jamaica
#11
Sheena Francis, Karla Saavedra-Rodriguez, Rushika Perera, Mark Paine, William C Black, Rupika Delgoda
The emergence of novel diseases spread by the Aedes aegypti mosquito in Jamaica and the Caribbean, has prompted studies on insecticide resistance towards effective management of the vector. Though Jamaica has been using the organophosphate insecticide malathion in its vector control program for more than 30 years, resistance to the pesticide has not been tested in over a decade. We analyzed resistance to malathion and the pyrethroid insecticide, permethrin on mosquitoes collected across St. Andrew, Jamaica, and analyzed the molecular basis of resistance...
2017: PloS One
https://www.readbyqxmd.com/read/28639722/european-guideline-for-the-management-of-scabies
#12
C M Salavastru, O Chosidow, M J Boffa, M Janier, G S Tiplica
Scabies is caused by Sarcoptes scabiei var. hominis. The disease can be sexually transmitted. Patients' main complaint is nocturnal itch. Disseminated, excoriated, erythematous papules are usually seen on the anterior trunk and limbs. Crusted scabies occurs in immunocompromised hosts and may be associated with reduced or absent pruritus. Recommended treatments are permethrin 5% cream, oral ivermectin and benzyl benzoate 25% lotion. Alternative treatments are malathion 0.5% aqueous lotion, ivermectin 1% lotion and sulphur 6-33% cream, ointment or lotion...
June 22, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/28639697/determination-of-metabolic-resistance-mechanisms-in-pyrethroid-resistant-and-fipronil-tolerant-brown-dog-ticks
#13
A L Eiden, P E Kaufman, F M Oi, M J Dark, J R Bloomquist, R J Miller
Rhipicephalus sanguineus (Latreille) (Ixodida: Ixodidae) is a three-host dog tick found worldwide that is able to complete its' entire lifecycle indoors. Options for the management of R. sanguineus are limited and its' control relies largely on only a few acaricidal active ingredients. Previous studies have confirmed permethrin resistance and fipronil tolerance in R. sanguineus populations, commonly conferred by metabolic detoxification or target site mutations. Herein, five strains of permethrin-resistant and three strains of fipronil-tolerant ticks were evaluated for metabolic resistance using synergists to block metabolic enzymes...
June 22, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28624474/-exposure-to-the-insecticides-permethrin-and-malathion-induces-leukemia-and-lymphoma-associated-gene-aberrations-in-vitro
#14
M P Navarrete-Meneses, C Salas-Labadía, M Sanabrais-Jiménez, J Santana-Hernández, A Serrano-Cuevas, R Juárez-Velázquez, A Olaya-Vargas, P Pérez-Vera
Epidemiological studies have associated the exposure to permethrin and malathion with increased risk of leukemia and lymphoma. The aim of this study was to evaluate whether in vitro exposure to permethrin and malathion induces aberrations in genes involved in the etiology of these hematological malignancies. Genetic abnormalities in the IGH, KMT2A (MLL), ETV6 and RUNX1 genes, and aneuploidy induced by the in vitro exposure to permethrin and malathion (200μM, 24h), were analyzed by FISH in peripheral blood mononuclear cells (PBMCs)...
June 15, 2017: Toxicology in Vitro: An International Journal Published in Association with BIBRA
https://www.readbyqxmd.com/read/28623302/insecticide-susceptibility-of-anopheles-mosquitoes-changes-in-response-to-variations-in-the-larval-environment
#15
Henry F Owusu, Nakul Chitnis, Pie Müller
Insecticide resistance threatens the success achieved through vector control in reducing the burden of malaria. An understanding of insecticide resistance mechanisms would help to develop novel tools and strategies to restore the efficacy of insecticides. Although we have substantially improved our understanding of the genetic basis of insecticide resistance over the last decade, we still know little of how environmental variations influence the mosquito phenotype. Here, we measured how variations in larval rearing conditions change the insecticide susceptibility phenotype of adult Anopheles mosquitoes...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28622373/a-versatile-and-low-cost-open-source-pipetting-robot-for-automation-of-toxicological-and-ecotoxicological-bioassays
#16
Sebastian Steffens, Leonie Nüßer, Thomas-Benjamin Seiler, Nadine Ruchter, Mark Schumann, Ricarda Döring, Catrina Cofalla, Avi Ostfeld, Elad Salomons, Holger Schüttrumpf, Henner Hollert, Markus Brinkmann
In the past decades, bioassays and whole-organism bioassay have become important tools not only in compliance testing of industrial chemicals and plant protection products, but also in the monitoring of environmental quality. With few exceptions, such test systems are discontinuous. They require exposure of the biological test material in small units, such as multiwell plates, during prolonged incubation periods, and do not allow online read-outs. It is mostly due to these shortcomings that applications in continuous monitoring of, e...
2017: PloS One
https://www.readbyqxmd.com/read/28595924/mechanisms-of-acaricide-resistance-in-the-cattle-tick-rhipicephalus-boophilus-microplus-in-sri-lanka
#17
K M U Janadaree Bandara, S H P Parakrama Karunaratne
High tolerance of ticks to acaricides is increasingly becoming a problem to cattle farmers. Resistance status of Rhipicephalus (Boophilus) microplus (Acari: Ixodidae)from two cattle farms of Sri Lanka were determined against different concentrations of pyrethroid permethrin, organophosphate malathion, organochlorine DDT and carbamate propoxur using Larval Packet Test (LPT) as recommended by Food and Agriculture Organization (FAO). Mechanisms of acaricide resistance were studied by conducting biochemical and PCR assays...
June 2017: Pesticide Biochemistry and Physiology
https://www.readbyqxmd.com/read/28595653/habitat-productivity-and-pyrethroid-susceptibility-status-of-aedes-aegypti-mosquitoes-in-dar-es-salaam-tanzania
#18
Leah Mathias, Vito Baraka, Anitha Philbert, Ester Innocent, Filbert Francis, Gamba Nkwengulila, Eliningaya J Kweka
BACKGROUND: Aedes aegypti (Diptera: Culicidae) is the main vector of the dengue virus globally. Dengue vector control is mainly based on reducing the vector population through interventions, which target potential breeding sites. However, in Tanzania, little is known about this vector's habitat productivity and insecticide susceptibility status to support evidence-based implementation of control measures. The present study aimed at assessing the productivity and susceptibility status of A...
June 9, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28589271/surveillance-of-pesticide-residues-in-fruits-and-vegetables-from-accra-metropolis-markets-ghana-2010-2012-a-case-study-in-sub-saharan-africa
#19
Paul Osei Fosu, Augustine Donkor, Cephas Ziwu, Brajesh Dubey, Robert Kingsford-Adaboh, Isaac Asante, Stephen Nyarko, Rose Tawiah, Noble Nazzah
Monitoring of pesticide residues in food commodities of plant origin is part of the regular controls on food to safeguard consumer's health. This study reports for the first time in Ghana a 3-year (2010-2012) monitoring of pesticide contamination of fruits and vegetables and their health implications. A total of 3483 samples were purchased in notable markets within Accra Metropolis and analysed for pesticide residues, employing the modified quick, easy, cheap, effective, rugged and safe analytical procedure...
July 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28586286/optimization-of-a-methodology-for-the-simultaneous-determination-of-deltamethrin-permethrin-and-malathion-in-stored-wheat-samples-using-dispersive-liquid-liquid-microextraction-with-solidification-of-floating-organic-drop-and-hplc-uv
#20
Meghdad Pirsaheb, Mansour Rezaei, Nazir Fattahi, Mohammad Karami, Kiomars Sharafi, Hamid R Ghaffari
The purpose of this study was to investigate common pesticides in stored wheat at Kermanshah province's silos in Iran. A simple, inexpensive, reliable and environmentally friendly method based on dispersive liquid-liquid microextraction with solidification of floating organic drop was developed. The analytical characteristics of the method were determined. Also, various parameters such as the materials of the silos, types of ownerships of the silos, geographic orientation of silo locations and climatic conditions of silo locations on pesticide residues in studied wheat samples were investigated...
June 6, 2017: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
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