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https://www.readbyqxmd.com/read/28334957/quechers-based-method-for-pesticides-analysis-in-adipose-tissue-associated-with-rat-ovaries
#1
Nathalie Zamariola, Pedro Toledo Netto, Carla Adriene da Silva Franchi, João Lauro Viana de Camargo, Mary Rosa Rodrigues de Marchi
The concomitant exposure to low doses of various pesticides is one of the most relevant issues in human toxicology today. An experimental toxicology study was developed to evaluate the effects of this type of exposure on the reproductive capacity of females of three species of rats that were exposed to mixtures of dicofol, dieldrin, endosulfan and permethrin at low doses (LOAEL and NOAEL). In this context, we have developed a method for determining pesticides in adipose tissue (0.5 g, 49% lipid) associated with the ovaries, based on the QuEChERS (quick, easy, cheap, effective, rugged and safe) strategy...
March 14, 2017: Journal of Analytical Toxicology
https://www.readbyqxmd.com/read/28334362/development-of-an-attract-and-kill-strategy-for-drosophila-suzukii-diptera-drosophilidae-evaluation-of-attracticidal-spheres-under-laboratory-and-field-conditions
#2
Kevin B Rice, Brent D Short, Tracy C Leskey
Drosophila suzukii Matsumura (Diptera: Drosophilidae) is an invasive, polyphagous fruit fly that attacks soft-skinned fruits. Originally from Asia, D. suzukii has successfully invaded the United States and the European and South American countries. At present, calendar-based insecticide applications are used to combat D. suzukii. Here, we evaluate a behaviorally based attract-and-kill management technique using attracticidal spheres to reduce D. suzukii infestations in raspberries. In laboratory bioassays aimed at identifying effective toxicants, attracticidal spheres containing dinotefuran at 1...
March 7, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334316/insecticide-resistance-of-several-field-collected-german-cockroach-dictyoptera-blattellidae-strains
#3
Xiaoyan Wu, Arthur G Appel
German cockroaches, Blattella germanica (L.), remain one of the most difficult indoor insect species to control because of its ability to develop resistance to insecticides. The toxicity and resistance levels of five technical-grade insecticides (permethrin, chlorpyrifos, propoxur, imidacloprid, and fipronil) were determined for adult males of seven strains of the German cockroach, a laboratory-reared susceptible strain (S) and six field-collected strains (B, D, E, G, H, and I). Using topical application methods, fipronil was the most toxic insecticide to all seven strains...
March 8, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28329606/clinical-applications-of-topical-ivermectin-in-dermatology
#4
Omid Zargari, Nessa Aghazadeh, Fatemeh Moeineddin
Ivermectin (IVM) is a broad-spectrum anti-parasitic drug with significant anti-inflammatory properties. The emergence of treatment resistance to lindane, permethrin, and possibly malathion complicates the global strategy for management of common parasitic skin diseases such as scabies and head lice. In this regard. IVM has been safely and effectively used in the treatment of these common human infestations. In addition, IVM may be useful in inflammatory cutaneous disorders such as papulopustular rosacea where demodex may play a role in pathogenesis...
September 15, 2016: Dermatology Online Journal
https://www.readbyqxmd.com/read/28303549/-the-anopheles-gambiae-species-complex-and-kdr-resistance-gene-at-the-periphery-of-douala-cameroon
#5
P Ntonga Akono, A Mbouangoro, A Mbida Mbida, C Ndo, M F Peka Nsangou, S Kekeunou
This study was conducted from May to June 2015 in Yassa (industrialized area) and Logbessou (non-industrialized area), two peri-urban areas of the city of Douala, Cameroon with the aim of an assessment of the spatial distribution of the gambiae complex, the determination of their resistance to insecticides and the distribution of the Kdr mutation. Mosquito larvae were collected by the dipping method and nursed to adult stage. The sensitivity of adult Anopheles gambiae s.l. populations to DDT and pyrethroids was assessed following WHO protocol...
March 16, 2017: Bulletin de la Société de Pathologie Exotique
https://www.readbyqxmd.com/read/28302529/gene-expression-modulation-of-abc-transporter-genes-in-response-to-permethrin-in-adults-of-the-mosquito-malaria-vector-anopheles-stephensi
#6
Valentina Mastrantonio, Marco Ferrari, Sara Epis, Agata Negri, Giulia Scuccimarra, Matteo Montagna, Guido Favia, Daniele Porretta, Sandra Urbanelli, Claudio Bandi
Living organisms have evolved an array of genes coding for detoxifying enzymes and efflux protein pumps, to cope with endogenous and xenobiotic toxic compounds. The study of the genes activated during toxic exposure is relevant to the area of arthropod vector control, since these genes are one of the targets upon which natural selection acts for the evolution of insecticide resistance. ATP-binding cassette (ABC) transporters participate to insecticide detoxification acting as efflux pumps, that reduce the intracellular concentration of toxic compounds, or of their metabolic derivatives...
March 13, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28300212/effect-of-pesticides-on-microbial-communities-in-container-aquatic-habitats
#7
Ephantus J Muturi, Ravi Kiran Donthu, Christopher J Fields, Imelda K Moise, Chang-Hyun Kim
Container aquatic habitats support a specialized community of macroinvertebrates (e.g. mosquitoes) that feed on microbial communities associated with decaying organic matter. These aquatic habitats are often embedded within and around agricultural lands and are frequently exposed to pesticides. We used a microcosm approach to examine the single and combined effects of two herbicides (atrazine, glyphosate), and three insecticides (malathion, carbaryl, permethrin) on microbial communities of container aquatic habitats...
March 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28283410/insecticide-pyrethroids-in-liver-of-striped-dolphin-from-the-mediterranean-sea
#8
Òscar Aznar-Alemany, Joan Giménez, Renaud de Stephanis, Ethel Eljarrat, Damià Barceló
Pyrethroid pesticides were analysed in liver of striped dolphin (Stenella coeruleoalba) from the Alboran Sea (south of Spain, Mediterranean Sea). The occurrence and bioaccumulation of pyrethroid insecticides in marine mammal tissues from the northern hemisphere had never been determined before. Pyrethroids were detected in 87% of the specimens with a mean total concentration of 300 ng g(-1) lw ± 932 (range 2.7-5200 ng g(-1) lw). Permethrin and tetramethrin were the main contributors to the pyrethroid profiles, with enantiospecific accumulation for the first and isomer specific accumulation for the latter...
March 7, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28266740/development-of-whole-sediment-toxicity-identification-evaluation-tie-techniques-for-two-australian-freshwater-species-chironomus-tepperi-and-austrochiltonia-subtenuis
#9
W Tyler Mehler, Michael J Keough, Vincent Pettigrove
Most of the public literature and available guidance documents on the conduct of freshwater whole-sediment toxicity identification evaluations (TIEs) detail the use of test organisms and amending agents that are readily available in North America. These commonly used test organisms and the supported amending agents, however, are not available and largely inappropriate (i.e. not native species) for conducting whole-sediment TIEs outside of North America. The overall objective of the present study was to build foundational methods for performing freshwater whole-sediment TIEs in Australia...
March 7, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28259582/development-of-passive-samplers-for-in-situ-measurement-of-pyrethroid-insecticides-in-surface-water
#10
Jiaying Xue, Chunyang Liao, Jie Wang, Zachary Cryder, Tianbo Xu, Fengmao Liu, Jay Gan
Pyrethroid insecticides are widely used in urban environments, and their occurrence has been recently associated with aquatic toxicity in urban surface streams. Synthetic pyrethroids are strongly hydrophobic compounds, highlighting the importance of the freely dissolved concentration (Cfree), rather than the total chemical concentration, for better prediction of potential effects in aquatic ecosystems. The goal of this study was to develop a simple, robust and field-applicable passive sampling methodology that may be used for in situ monitoring of trace levels of pyrethroids in surface water...
March 1, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28245893/stability-of-nano-sized-permethrin-in-its-colloidal-state-and-its-effect-on-the-physiological-and-biochemical-profile-of-culex-tritaeniorhynchus-larvae
#11
P Mishra, A P B Balaji, P K Dhal, R S Suresh Kumar, S Magdassi, K Margulis, B K Tyagi, A Mukherjee, N Chandrasekaran
The occurrence of pesticidal pollution in the environment and the resistance in the mosquito species makes an urge for the safer and an effective pesticide. Permethrin, a poorly water-soluble pyrethroid pesticide, was formulated into a hydrodispersible nanopowder through rapid solvent evaporation of pesticide-loaded oil in water microemulsion. Stability studies confirmed that the nanopermethrin dispersion was stable in paddy field water for 5 days with the mean particle sizes of 175.3 ± 0.75 nm and zeta potential of -30...
March 1, 2017: Bulletin of Entomological Research
https://www.readbyqxmd.com/read/28213257/a-zeolitic-imidazolate-framework-based-nanoporous-carbon-as-a-novel-fiber-coating-for-solid-phase-microextraction-of-pyrethroid-pesticides
#12
Shuaihua Zhang, Qian Yang, Xiumin Yang, Wenchang Wang, Zhi Li, Lihong Zhang, Chun Wang, Zhi Wang
A high-surface-area nanoporous carbon (NPC) has been successfully synthesized by using the metal-organic framework ZIF-90 as both the template and precursor together with furfuryl alcohol as a secondary carbon source. The prepared ZIF-90 templated NPC (ZIF-90-NPC) was then coated onto a stainless steel wire by a simple physical adhesion approach to prepare solid-phase microextraction (SPME) fiber. By coupling the ZIF-90-NPC coated fiber-based SPME with gas chromatography-microelectron capture detection (GC-μECD), the developed method gave a large enhancement factor (984-2869), low limit of detection (0...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28206864/impact-of-topical-application-site-on-the-efficacy-of-permethrin-and-malathion-to-culex-quinquefasciatus
#13
Robert L Aldridge, Phillip E Kaufman, Jeffrey R Bloomquist, Salvador A Gezan, Kenneth J Linthicum
Although insecticide spray droplets will potentially impinge on many exoskeletal body regions, traditional mosquito topical bioassays focus insecticide application to the mesothoracic pleural or dorsal area. Concentrations of permethrin and malathion found in droplets from ultra-low volume and low-volume sprays were evaluated for efficacy against adult Culex quinquefasciatus using a topical application bioassay. Results document nonuniform insecticide sensitivity across body regions, which has not been previously assessed in mosquitoes...
December 2016: Journal of the American Mosquito Control Association
https://www.readbyqxmd.com/read/28206856/effect-of-photoperiod-on-permethrin-resistance-in-aedes-aegypti
#14
O Karina Villanueva, Gustavo Ponce, Beatriz Lopez, Selene M Gutierrez, Iram P Rodriguez, Guadalupe Reyes, Karla J Saavedra, William C Black, Julian Garcia, Barry Beaty, Lars Eisen, Adriana E Flores
Living organisms have been exposed to light-dark cycles that allowed them to adapt to different ecological niches. Circadian cycles affect hormone release, metabolism, and response to xenobiotic compounds. Current studies have shown that insect susceptibility to toxic agents depends on circadian cycles, mainly because the biochemical processes involved in detoxification and responses to oxidative stress are modulated by this process. The goal of this study was to determine the effect of photoperiod on resistance to permethrin in Aedes aegypti ...
December 2016: Journal of the American Mosquito Control Association
https://www.readbyqxmd.com/read/28196318/common-skin-conditions-in-children-skin-infections
#15
Brian Z Rayala, Dean S Morrell
Skin infections account for a significant subset of dermatologic conditions of childhood. Common cutaneous viral infections in children include warts, molluscum contagiosum, hand-foot-and-mouth disease, and herpes simplex. Although viral infections are self-limited and often only mildly symptomatic, they can cause anxiety, embarrassment, and health care use. Recognition of their common and atypical presentations is necessary to differentiate them from other skin conditions of similar morphology. Impetigo, cellulitis, and abscess comprise the majority of childhood bacterial skin infections and are treated with topical or systemic antibiotics that cover group A Streptococcus and Staphylococcus aureus...
February 2017: FP Essentials
https://www.readbyqxmd.com/read/28191507/mapping-the-distribution-of-anopheles-funestus-across-benin-highlights-a-sharp-contrast-of-susceptibility-to-insecticides-and-infection-rate-to-plasmodium-between-southern-and-northern-populations
#16
Rousseau Djouaka, Romaric Akoton, Genevieve M Tchigossou, Seun M Atoyebi, Helen Irving, Michael O Kusimo, Innocent Djegbe, Jacob M Riveron, Eric Tossou, Akadiri Yessoufou, Charles S Wondji
Background. Malaria remains an important public health issue in Benin, with Anopheles gambiae s.l. and Anopheles funestus s.s being the predominant vectors. This study was designed to generate information on An. funestus distribution, molecular speciation, Plasmodium infection rate and insecticide susceptibility status across Benin. Methods. Mosquito samples were collected from December 2014 to January 2016 in 46 localities in Benin. These samples were mapped and An. funestus collected were speciated to the molecular level...
December 14, 2016: Wellcome Open Res
https://www.readbyqxmd.com/read/28168834/pyrethroid-and-ddt-tolerance-of-anopheles-gambiae-s-l-from-sengerema-district-an-area-of-intensive-pesticide-usage-in-northwestern-tanzania
#17
Anita Philbert, Sylvester Leonard Lyantagaye, Gabriele Pradel, Che Julius Ngwa, Gamba Nkwengulila
OBJECTIVE: To assess the susceptibility status of malaria vectors to pyrethroids and dichlorodiphenyltrichloroethane (DDT), characterize the mechanisms underlying resistance, and to evaluate the role of agro-chemical use in resistance selection among malaria vectors in Sengerema agro ecosystem zone, Tanzania. METHODS: Mosquito larvae were collected from farms and reared to obtain adults. The susceptibility status of An. gambiae s.l. was assessed using WHO bioassay tests to permethrin, deltamethrin, lambdacyhalothrin, etofenprox, cyfluthrin, and DDT...
February 7, 2017: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/28132950/malaria-transmission-and-the-sensitivity-of-aggressive-mosquitoes-to-insecticides-in-a-poorly-urbanized-area-of-the-deido-health-district-in-douala-cameroon
#18
P Akono Ntonga, C Tonga, J A Mbida Mbida, C Ndo, P Awono Ambene, L G Lehman, R Ngaha, O E Ngo Hondt, M F Peka Nsangou, N Tedongmo Lopedji
The design of an appropriate strategy for mosquito control in urban areas must take into account the local ecoclimate and its particularities. This study sought to determine the dynamics of malaria transmission and the level of insecticide susceptibility of aggressive mosquitoes in Ndogbong, a poorly urbanized district of Douala. Mosquitoes were captured on volunteers in 4 houses and outdoors for 2 consecutive nights a month, from April to September 2014, and identified by molecular and morphologic techniques...
January 27, 2017: Médecine et Santé Tropicales
https://www.readbyqxmd.com/read/28119079/deltamethrin-increases-the-fat-accumulation-in-3t3-l1-adipocytes-and-caenorhabditis-elegans
#19
Peiyi Shen, Tsung-Hsiu Hsieh, Yiren Yue, Quancai Sun, John M Clark, Yeonhwa Park
Research has shown that permethrin, a Type-I pyrethroid, increases triglyceride (fat) accumulation in adipocytes. Little is known, however, about any similar effect of deltamethrin, a Type-II pyrethroid, which produces a distinct syndrome of poisoning in mammals compared with permethrin. This study was therefore aimed to explore the role of deltamethrin on fat accumulation in 3T3-L1 adipocytes and Caenorhabditis elegans. Deltamethrin (10 μM) significantly increased the fat accumulation in 3T3-L1 adipocytes and wild type C...
March 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28112252/the-choreography-of-the-chemical-defensome-response-to-insecticide-stress-insights-into-the-anopheles-stephensi-transcriptome-using-rna-seq
#20
Leone De Marco, Davide Sassera, Sara Epis, Valentina Mastrantonio, Marco Ferrari, Irene Ricci, Francesco Comandatore, Claudio Bandi, Daniele Porretta, Sandra Urbanelli
Animals respond to chemical stress with an array of gene families and pathways termed "chemical defensome". In arthropods, despite many defensome genes have been detected, how their activation is arranged during toxic exposure remains poorly understood. Here, we sequenced the transcriptome of Anopheles stephensi larvae exposed for six, 24 and 48 hours to the LD50 dose of the insecticide permethrin to monitor transcriptional changes of defensome genes across time. A total of 177 genes involved in insecticide defense were differentially expressed (DE) in at least one time-point, including genes encoding for Phase 0, I, II, III and antioxidant enzymes and for Heat Shock and Cuticular Proteins...
January 23, 2017: Scientific Reports
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