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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
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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...
January 22, 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
#9
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
https://www.readbyqxmd.com/read/28111191/mutations-of-two-acidic-residues-at-the-cytoplasmic-end-of-segment-iiis6-of-an-insect-sodium-channel-have-distinct-effects-on-pyrethroid-resistance
#10
Mengli Chen, Yuzhe Du, Yoshiko Nomura, Guonian Zhu, Boris S Zhorov, Ke Dong
Mutations in sodium channels are known to confer knockdown resistance to pyrethroid insecticides, such as permethrin and cypermethrin, in various agricultural pests and disease vectors. Double mutations, D(3i28)V and E(3i32)G, were detected in cypermethrin-resistant Helicoverpa armigera and Heliothis virescens populations. However, the role of the two mutations in pyrethroid resistance remains unclear. In this study, we introduced the mutations into the cockroach sodium channel, BgNav1-1a, and examined their effects on channel gating and pyrethroid sensitivity in Xenopus oocytes...
January 20, 2017: Insect Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28106921/evaluation-of-efficacy-of-impregnated-curtains-in-experimental-hen-houses-as-a-phlebotomine-control-tool-in-northeast-argentina
#11
M Manteca Acosta, M S Santini, A A Pérez, O D Salomón
The aim of this study was to evaluate the effectiveness of insecticide-impregnated curtains against the entry of phlebotomine (Diptera: Psychodidae) flies into experimental slatted hen houses in an area endemic for American cutaneous leishmaniasis (ACL). Three treatments in experimental dwellings containing three chickens each were applied using, respectively, an impregnated curtain (IC), a non-impregnated curtain (NIC) and no curtain (NC). A control site without chickens (WC) was included. The study used permethrin at 0...
January 20, 2017: Medical and Veterinary Entomology
https://www.readbyqxmd.com/read/28106327/evaluation-of-the-matrix-like-effect-in-multiresidue-pesticide-analysis-by-gas-chromatography-with-tandem-mass-spectrometry
#12
Kazuhiko Akutsu, Masato Yoshimitsu, Yoko Kitagawa, Satoshi Takatori, Naoki Fukui, Masakazu Osakada, Satoko Yamaguchi, Keiji Kajimura, Hirotaka Obana, Takaho Watanabe
In multiresidue pesticide analysis using gas chromatography, it has long been recognized that an increase in the number of pesticides present in a standard solution can result in an enhancement of the peak responses of certain pesticides. Despite being widely acknowledged, this phenomenon has been rarely studied and is poorly understood. In this study, the authors have tentatively called this phenomenon the "matrix-like effect" and demonstrated it clearly using gas chromatography with tandem mass spectrometry...
January 20, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28103255/mitigating-diseases-transmitted-by-aedes-mosquitoes-a-cluster-randomised-trial-of-permethrin-impregnated-school-uniforms
#13
Pattamaporn Kittayapong, Phanthip Olanratmanee, Pongsri Maskhao, Peter Byass, James Logan, Yesim Tozan, Valérie Louis, Duane J Gubler, Annelies Wilder-Smith
BACKGROUND: Viral diseases transmitted via Aedes mosquitoes are on the rise, such as Zika, dengue, and chikungunya. Novel tools to mitigate Aedes mosquitoes-transmitted diseases are urgently needed. We tested whether commercially insecticide-impregnated school uniforms can reduce dengue incidence in school children. METHODS: We designed a cluster-randomised controlled trial in Thailand. The primary endpoint was laboratory-confirmed dengue infections. Secondary endpoints were school absenteeism; and impregnated uniforms' 1-hour knock-down and 24 hour mosquito mortality as measured by standardised WHOPES bioassay cone tests at baseline and after repeated washing...
January 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28095121/toxicity-of-new-pyrethroid-in-pest-insects-ascia-monuste-and-diaphania-hyalinata-predator-solenopsis-saevissima-and-stingless-bee-tetragonisca-angustula
#14
Shaiene C Moreno, Flaviano O Silvério, Mayara C Lopes, Rodrigo S Ramos, Elson S Alvarenga, Marcelo C Picanço
There is increasing demand for new products for vegetable pest management. Thus, the aim of this study was to assess the toxicity of pyrethroids with acid moiety modifications to measure the insecticidal activity of these compounds on the lepidopteran vegetable pests Diaphania hyalinata (L.) (Lepidoptera: Pyralidae) and Ascia monuste (Latreille) (Lepidoptera: Pieridae) and evaluate their selectivity for the predatory ant Solenopsis saevissima (F. Smith) (Hymenoptera: Formicidae) and pollinator Tetragonisca angustula (Latreille) (Hymenoptera: Apidae: Meliponinae)...
January 17, 2017: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/28074632/gene-expression-profiles-of-the-southern-house-mosquito-culex-quinquefasciatus-during-exposure-to-permethrin
#15
William R Reid, Lee Zhang, Youhui Gong, Ting Li, Nannan Liu
Insecticide resistance is a major obstacle to the management of disease-vectoring mosquitoes worldwide. The genetic changes and detoxification genes involved in insecticide resistance have been extensively studied in populations of insecticide-resistant, however few studies have focused on the resistance genes up-regulated upon insecticide exposure and the possible regulation pathways involved in insecticide resistance. To characterize the changes in gene expression during insecticide exposure, and to investigate the possible connection of known regulation pathways with insecticide resistance, we conducted RNA-Seq analysis of a highly-permethrin resistant strain of Culex quinquefasciatus following permethrin exposure...
January 10, 2017: Insect Science
https://www.readbyqxmd.com/read/28062820/epidemiology-diagnosis-and-treatment-of-scabies-in-a-dermatology-office
#16
Kathryn L Anderson, Lindsay C Strowd
BACKGROUND: Scabies is a neglected skin disease, and little is known about current incidence and treatment patterns in the United States. The purpose of this study was to examine demographic data, treatment types, success of treatment, and misdiagnosis rate of scabies in an outpatient dermatology clinic. METHODS: A retrospective chart review of patients diagnosed with scabies within the past 5 years was performed. RESULTS: A total of 459 charts were identified, with 428 meeting inclusion criteria...
January 2017: Journal of the American Board of Family Medicine: JABFM
https://www.readbyqxmd.com/read/28049476/an-improved-extraction-method-for-surface-dosage-of-insecticides-on-treated-textile-fabrics
#17
Florence Dieval, Jérémy Bouyer, Jean-François Fafet
BACKGROUND: Tens of millions of people live in mosquito-infested regions and controlling mosquito-borne diseases is one of the major interventions aimed at alleviating poverty worldwide. The use of insecticide-treated textiles is one of the most widespread control measures. This includes bed nets, battle clothing or, more generally, textiles use for clothing. These textiles are generally treated with permethrin as active ingredient, which is dosed after extraction of the active molecule present throughout the fabric (measured in mg permethrin/g of fabric) and does not take the effective concentration on the textile surfaces into account...
January 4, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28032101/current-susceptibility-status-of-anopheles-stephensi-diptera-culicidae-to-different-imagicides-in-a-malarious-area-southeastern-of-iran
#18
Mohammad Amin Gorouhi, Hassan Vatandoost, Mohammad Ali Oshaghi, Ahmad Raeisi, Ahmad Ali Enayati, Hossein Mirhendi, Ahmad Ali Hanafi-Bojd, Mohammad Reza Abai, Yaser Salim-Abadi, Fatemeh Rafi
BACKGROUND: Anopheles mosquitoes are an important group of arthropods due to their role in transmission of malaria. The present study was conducted for determination of susceptibility status of Anopheles stephensi to different imagicides collected from malarious area in Chabahar city, Iran. METHODS: In the present study seven insecticides including: DDT 4%, lambdacyhalothrin 0.05%, deltamethrin 0.05%, permethrin 0.75%, cyfluthrin 0.15% and etofenprox 0.5% were tested based on WHO method...
December 2016: Journal of Arthropod-borne Diseases
https://www.readbyqxmd.com/read/28025109/deet-potentiates-the-development-and-persistence-of-anticholinesterase-dependent-chronic-pain-signs-in-a-rat-model-of-gulf-war-illness-pain
#19
L K Flunker, T J Nutter, R D Johnson, B Y Cooper
Exposure to DEET (N,N-diethyl-meta-toluamide) may have influenced the pattern of symptoms observed in soldiers with GWI (Gulf War Illness; Haley and Kurt, 1997). We examined how the addition of DEET (400mg/kg; 50% topical) to an exposure protocol of permethrin (2.6mg/kg; topical), chlorpyrifos (CP; 120mg/kg), and pyridostigmine bromide (PB;13mg/kg) altered the emergence and pattern of pain signs in an animal model of GWI pain (Nutter et al., 2015). Rats underwent behavioral testing before, during and after a 4week exposure: 1) hindlimb pressure withdrawal threshold; 2) ambulation (movement distance and rate); and 3) resting duration...
December 23, 2016: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28019099/emissions-of-selected-semivolatile-organic-chemicals-from-forest-and-savannah-fires
#20
Xianyu Wang, Phong K Thai, Marc Mallet, Maximilien Desservettaz, Darryl W Hawker, Melita Keywood, Branka Miljevic, Clare Paton-Walsh, Michael Gallen, Jochen F Mueller
The emission factors (EFs) for a broad range of semivolatile organic chemicals (SVOCs) from subtropical eucalypt forest and tropical savannah fires were determined for the first time from in situ investigations. Significantly higher (t test, P < 0.01) EFs (μg kg(-1) dry fuel, gas + particle-associated) for polycyclic aromatic hydrocarbons (∑13 PAHs) were determined from the subtropical forest fire (7,000 ± 170) compared to the tropical savannah fires (1,600 ± 110), due to the approximately 60-fold higher EFs for 3-ring PAHs from the former...
January 18, 2017: Environmental Science & Technology
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