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https://www.readbyqxmd.com/read/28742096/insecticide-resistance-is-mediated-by-multiple-mechanisms-in-recently-introduced-aedes-aegypti-from-madeira-island-portugal
#1
Gonçalo Seixas, Linda Grigoraki, David Weetman, José Luís Vicente, Ana Clara Silva, João Pinto, John Vontas, Carla Alexandra Sousa
BACKGROUND: Aedes aegypti is a major mosquito vector of arboviruses, including dengue, chikungunya and Zika. In 2005, Ae. aegypti was identified for the first time in Madeira Island. Despite an initial insecticide-based vector control program, the species expanded throughout the Southern coast of the island, suggesting the presence of insecticide resistance. Here, we characterized the insecticide resistance status and the underlying mechanisms of two populations of Ae. aegypti from Madeira Island, Funchal and Paúl do Mar...
July 24, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28741937/lanthanide-organophosphate-spiro-polymers-synthesis-structure-and-magnetocaloric-effect-in-the-gadolinium-polymer
#2
Sandeep K Gupta, Gulzar A Bhat, Ramaswamy Murugavel
Spirocyclic lanthanide organophosphate polymers, {[Ln(dipp)(dippH)(CH3OH)(H2O)2](CH3OH)2}n [Ln = La (1), Ce (2), Pr (3), Nd (4), Sm (5), Eu (6), Gd (7), Tb (8), Dy (9), Ho (10), Er (11)], have been prepared from the reaction of Ln(NO3)3·xH2O with sterically hindered 2,6-diisopropylphenyl phosphate (dippH2) using aqueous NaOH as the base. The one-dimensional chainlike lanthanide (III) organophosphate coordination polymers have been characterized with the aid of analytical and spectroscopic methods. The single crystal structure determination of polymers (2-5 and 7-11) reveals that in these compounds the hydrophobic organic groups of the phosphate provide a protective coating for the inorganic lanthanide phosphate polymeric chain...
July 25, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28738583/application-of-headspace-and-direct-immersion-solid-phase-microextraction-in-the-analysis-of-organothiophosphates-related-to-the-chemical-weapons-convention-from-water-and-complex-matrices
#3
Marc André Althoff, Andreas Bertsch, Manfred Metzulat, Thomas M Klapötke, Konstantin L Karaghiosoff
The successful application of headspace (HS) and direct immersion (DI) solid phase microextraction (SPME) for the unambiguous identification and characterization of a series of toxic thiophosphate esters, such as Amiton (I), from aqueous phases and complex matrices (e.g. grass and foliage) has been demonstrated. A Thermo Scientific gas chromatograph (GC) - tandem mass spectrometer (MS/MS) system with a TriPlus RSH® autosampler and a SPME tool was used to investigate the effect of different parameters that influence the extraction efficiency: e...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28734356/palladium-copper-nanowires-based-biosensor-for-the-ultrasensitive-detection-of-organophosphate-pesticides
#4
Dandan Song, Yan Li, Xiong Lu, Muxue Sun, Hui Liu, Guangming Yu, Faming Gao
A highly sensitive acetylcholinesterase (AChE) electrochemical biosensor for the quantitative determination of organophosphate pesticides (OPs) in vegetables and fruits based on palladium-copper nanowires (Pd-Cu NWs) was reported. AChE immobilized on the modified electrode could catalyze hydrolysis of acetylthiocholine chloride (ATCl), generating an irreversible oxidation peak. When exposed to the OPs, the activity of the AChE was inhibited and the current significantly decreased. The detection mechanism is based on the inhibition of AChE...
August 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28733390/triphosphate-tunnel-metalloenzyme-function-in-senescence-highlights-a-biological-diversification-of-this-protein-superfamily
#5
Huoi Ung, Purva KAria, Kazuo Ebine, Wolfgang Moeder, Takashi Ueda, Keiko Yoshioka
The triphosphate tunnel metalloenzyme (TTM) superfamily comprises a group of enzymes that hydrolyze organophosphate substrates. They exist in all domains of life, yet the biological role of most family members is unclear. Arabidopsis thaliana encodes three TTM genes. We have previously reported that AtTTM2 displays pyrophosphatase activity and is involved in pathogen resistance. Here we report the biochemical activity and biological function of AtTTM1 and diversification of the biological roles between AtTTM1 and 2...
July 21, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28732283/deciphering-the-mechanism-of-interaction-of-edifenphos-with-calf-thymus-dna
#6
Ajaz Ahmad, Masood Ahmad
Edifenphos is an important organophosphate pesticide with many antifungal and anti-insecticidal properties but it may cause potential hazards to human health. In this work, we have tried to explore the binding mode of action and mechanism of edifenphos to calf thymus DNA (CT-DNA). Several experiments such as ultraviolet-visible absorption spectra and emission spectroscopy showed complex formation between edifenphos and CT-DNA and low binding constant values supporting groove binding mode. These results were further confirmed by circular dichroism (CD), CT-DNA melting studies, viscosity measurements, density functional theory and molecular docking...
July 13, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28731314/desensitization-to-chemical-and-food-sensitivities-by-low-dose-immunotherapy-ascertained-by-provocation-neutralization-is-associated-with-reduced-influx-of-calcium-ions-into-lymphocytes
#7
Basant K Puri, John McLaren Howard, Jean A Monro
Background Food and chemical sensitivities have detrimental effects on health and the quality of life. The natural course of such sensitivities can potentially be altered through various types of allergen-specific immunotherapy, including low-dose immunotherapy. The molecular mechanism by which low-dose immunotherapy causes desensitization has not thus far been elucidated. While resting lymphocytes maintain a low cytosolic calcium ion concentration, antigen receptor signaling results in calcium ion influx, predominantly via store-operated calcium channels...
April 26, 2017: Journal of Complementary & Integrative Medicine
https://www.readbyqxmd.com/read/28728929/an-evaporation-assisted-dispersive-liquid-liquid-microextraction-technique-as-a-simple-tool-for-high-performance-liquid-chromatography-tandem-mass-spectrometry-determination-of-insecticides-in-wine
#8
Irina Timofeeva, Daria Kanashina, Leonid Moskvin, Andrey Bulatov
A sample pre-treatment technique based on evaporation-assisted dispersive liquid-liquid microextraction (EVA-DLLME), followed by HPLC-MS/MS has been developed for the determination of organophosphate insecticides (malathion, diazinon, phosalone) in wine samples. The procedure includes the addition of mixture of organic solvents (with density higher than water), consisting of the extraction (low density) and volatile (high density) solvents, to aqueous sample followed by heating of the mixture obtained, what promotes the volatile solvent evaporation and moving extraction solvent droplets from down to top of the aqueous sample and, as a consequence, microextraction of target analytes...
July 11, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28727779/contemporary-status-of-insecticide-resistance-in-the-major-aedes-vectors-of-arboviruses-infecting-humans
#9
REVIEW
Catherine L Moyes, John Vontas, Ademir J Martins, Lee Ching Ng, Sin Ying Koou, Isabelle Dusfour, Kamaraju Raghavendra, João Pinto, Vincent Corbel, Jean-Philippe David, David Weetman
Both Aedes aegytpi and Ae. albopictus are major vectors of 5 important arboviruses (namely chikungunya virus, dengue virus, Rift Valley fever virus, yellow fever virus, and Zika virus), making these mosquitoes an important factor in the worldwide burden of infectious disease. Vector control using insecticides coupled with larval source reduction is critical to control the transmission of these viruses to humans but is threatened by the emergence of insecticide resistance. Here, we review the available evidence for the geographical distribution of insecticide resistance in these 2 major vectors worldwide and map the data collated for the 4 main classes of neurotoxic insecticide (carbamates, organochlorines, organophosphates, and pyrethroids)...
July 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28725644/pesticides-curbing-soil-fertility-effect-of-complexation-of-free-metal-ions
#10
Sukhmanpreet Kaur, Vijay Kumar, Mohit Chawla, Luigi Cavallo, Albert Poater, Niraj Upadhyay
Researchers have suggested that the reason behind infertility is pernicious effect of broad spectrum pesticides on non target, beneficial microorganism of soil. Here, studying the chelating effect of selective organophosphate and carbamate pesticides with essential metal ions, at all possible combinations of three different pH (4 ± 0.05, 7 ± 0.05 and 9 ± 0.05) and three different temperatures (15 ± 0.5°C, 30 ± 0.5°C and 45 ± 0.5°C), shows very fast rate of reaction which further increases with increase of pH and temperature...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28724251/concurrent-exposures-to-nonylphenol-bisphenol-a-phthalates-and-organophosphate-pesticides-on-birth-outcomes-a-cohort-study-in-taipei-taiwan
#11
Yu-Fang Huang, Wen-Chi Pan, Yen-An Tsai, Chia-Huang Chang, Pei-Jung Chen, Yi-Shuan Shao, Ming-Song Tsai, Jia-Woei Hou, Chensheng Alex Lu, Mei-Lien Chen
Prenatal exposure to phenols, phthalates (PAEs), and organophosphate (OP) pesticides may increase the risk of abnormal birth outcomes. However, many previous studies have examined exposure to a limited number of chemical classes or exposure profiles limited to a specific stage of pregnancy. This study aims to characterize the concurrent exposure scenario throughout pregnancy by simultaneously monitoring internal doses of several endocrine-disrupting compounds (EDCs), including 2 phenols (nonylphenol (NP) and bisphenol A (BPA)), 9 PAEs, and 6 OP pesticide metabolites and to assess the relationships between concurrent exposure to EDCs and infant birth weight, length, and head and chest circumference...
July 15, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28723187/wearable-flexible-and-stretchable-glove-biosensor-for-on-site-detection-of-organophosphorus-chemical-threats
#12
Rupesh K Mishra, Lee J Hubble, Aida Martín, Rajan Kumar, Abbas Barfidokht, Jayoung Kim, Mustafa M Musameh, Ilias L Kyratzis, Joseph Wang
A flexible glove-based electrochemical biosensor with highly stretchable printed electrode system has been developed as a wearable point-of-use screening tool for defense and food security applications. This disposable-mechanically robust "lab-on-a-glove" integrates a stretchable printable enzyme-based biosensing system and active surface for swipe sampling on different fingers, and is coupled with a compact electronic interface for electrochemical detection and real-time wireless data transmission to a smartphone device...
April 28, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28722512/in-silico-and-in-vitro-evaluation-of-two-novel-oximes-k378-and-k727-in-comparison-to-k27-and-pralidoxime-against-paraoxon-ethyl-intoxication
#13
Maria Chaudhry, Muhammad Qaiser Fatmi, Kamil Musilek, Alamdar Hussain, Kamil Kuca, Georg Petroianu, Huba Kalasz, Syed Muhammad Nurulain
Organophosphate (OP) poisoning is a major global health issue; while compounds from this group have been used intensively over the last century, an effective antidote is still lacking. Oxime-type AChE reactivators are used to reactivate the OP inhibited AChE. Pralidoxime is the only US Food and Drug Administration, (FDA) approved oxime for therapeutic use but its efficacy has been disappointing. Two novel oximes (K378 and K727) were investigated in silico and in vitro and compared with an experimental oxime (kamiloxime; K-27) and pralidoxime...
July 19, 2017: Toxicology Mechanisms and Methods
https://www.readbyqxmd.com/read/28718803/serum-albumin-binding-and-esterase-activity-mechanistic-interactions-with-organophosphates
#14
Nikolay V Goncharov, Daria A Belinskaia, Vladimir I Shmurak, Maxim A Terpilowski, Richard O Jenkins, Pavel V Avdonin
The albumin molecule, in contrast to many other plasma proteins, is not covered with a carbohydrate moiety and can bind and transport various molecules of endogenous and exogenous origin. The enzymatic activity of albumin, the existence of which many scientists perceive skeptically, is much less studied. In toxicology, understanding the mechanistic interactions of organophosphates with albumin is a special problem, and its solution could help in the development of new types of antidotes. In the present work, the history of the issue is briefly examined, then our in silico data on the interaction of human serum albumin with soman, as well as comparative in silico data of human and bovine serum albumin activities in relation to paraoxon, are presented...
July 18, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28717090/delayed-polyneuropathy-induced-by-organophosphate-poisoning
#15
Shunsuke Kobayashi, Reiko Okubo, Yoshikazu Ugawa
An 89-year-old man attempted suicide by ingesting a pesticide (trichlorfon). After surviving the initial critical period in the intensive care unit, he developed rapidly progressive distal weakness and sensory disturbance. Electrophysiological examinations revealed sensory motor axonal polyneuropathy. Delayed polyneuropathy is a rare manifestation of organophosphate poisoning. Nerve conduction studies play an important role in the diagnosis of this rare clinical condition.
2017: Internal Medicine
https://www.readbyqxmd.com/read/28714263/enhancing-methyl-parathion-degradation-by-the-immobilization-of-burkholderia-sp-isolated-from-agricultural-soils
#16
Maikel Gilberto Fernández-López, Carolina Popoca-Ursino, Enrique Sánchez-Salinas, Raunel Tinoco-Valencia, Jorge Luis Folch-Mallol, Edgar Dantán-González, Ma Laura Ortiz-Hernández
Organophosphate pesticides are of great interest for research because they are currently the most commonly used pesticides. In this study, a bacterial strain capable of completely degrading methyl parathion (MP) was isolated from agricultural soils in central Mexico. This strain was designated strain S5-2 and was identified as Burkholderia cenocepacia. To increase degradation yields, cells were immobilized on three different supports: powdered zeolite and Opuntia sp. and Agave sp. fibers. The results indicated a significant increase in MP hydrolysis and p-nitrophenol (PNP) degradation with immobilized cells compared to free cell cultures...
July 17, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28711770/multigenerational-effects-evaluation-of-the-flame-retardant-tris-2-butoxyethyl-phosphate-tboep-using-daphnia-magna
#17
Maeva Giraudo, Maxime Dubé, Mélanie Lépine, Pierre Gagnon, Mélanie Douville, Magali Houde
Tris(2-butoxyethyl) phosphate (TBOEP) is an organophosphate ester used as substitute following the phase-out of brominated flamed retardants. Because of its high production volume and its use in a broad range of applications, this chemical is now frequently detected in the environment and biota. However, limited information is available on the long-term effects of TBOEP in aquatic organisms. In this study, Daphnia magna were exposed over three 21d generations to an environmentally relevant concentration of TBOEP (10μg/L) and effects were evaluated at the gene transcription, protein, and life-history (i...
July 8, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28711273/treatment-methods-following-suicidal-self-administration-of-iv-organophosphate-what-can-additional-lipid-administration-change
#18
Kenan Ahmet Turkdogan, Ali Duman, Mucahit Avcil, Ayhan Akoz, Selcuk Eren Canakcı, Burcak Kantekin
Organic phosphor compounds are highly toxic and life-threatening compounds that are widely used in agriculture, households and gardens worldwide. While oral intakes are observed frequently, toxic effects can also be seen through contract or inhalation. However, toxic cases through the parenteral route have rarely been reported. We had three main aims: first, to present a male patient who self-administered 2ml of monocrotophos intravenously to commit suicide. Our second goal was to present the current multiple treatment methods, such as fast general support, antidote treatment, lipid emulsion treatment, and plasmapheresis along with the literature...
July 8, 2017: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/28709054/probing-the-relationship-between-external-and-internal-human-exposure-of-organophosphate-flame-retardants-using-pharmacokinetic-modelling
#19
Thuy T Bui, Fuchao Xu, Nele Van den Eede, Anna Palm Cousins, Adrian Covaci, Ian T Cousins
Human external exposure (i.e. intake) of organophosphate flame retardants (PFRs) has recently been quantified, but no link has yet been established between external and internal exposure. In this study, we used a pharmacokinetic (PK) model to probe the relationship between external and internal exposure data for three PFRs (EHDPHP, TNBP and TPHP) available for a Norwegian cohort of 61 individuals from 61 different households. Using current literature on metabolism of PFRs, we predicted the metabolite serum/urine concentrations and compared it to measured data from the study population...
July 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28705749/in%C3%A2-vitro-effect-of-metrifonate-on-the-indices-of-oxidative-stress-in-gigantocotyle-explanatum
#20
Mohammad Ahmad, Murad A Mubaraki, Mohammed Ali M Marie
Helminth infections in general and digenetic trematodes in particular cause a huge economic loss globally to our livestock. Gigantocotyle explanatum is a digenetic amphistome that infects the bile ducts of water buffalo and are highly prevalent in tropical and sub-tropical countries. In the present study, effects of an organophosphate compound, Metrifonate (MF) in three doses, viz., 9.4 × 10(-5) M (Dose I), 14.4 × 10(-5) M (Dose II), and 19.4 × 10(-5) M (Dose III), have been studied in vitro, on the motility and on some enzymatic and non-enzymatic oxidative stress indices in G...
July 10, 2017: Microbial Pathogenesis
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