keyword
MENU ▼
Read by QxMD icon Read
search

Neonicotinoid

keyword
https://www.readbyqxmd.com/read/28811174/subchronic-exposure-to-sublethal-dose-of-imidacloprid-changes-electrophysiological-properties-and-expression-pattern-of-nicotinic-acetylcholine-receptor-subtypes-in-insect-neurosecretory-cells
#1
Yassine Benzidane, Delphine Goven, Aly Ahmed Abd-Ella, Caroline Deshayes, Bruno Lapied, Valérie Raymond
Neonicotinoids are the most important class of insecticides used in agriculture over the last decade. They act as selective agonists of insect nicotinic acetylcholine receptors (nAChRs). The emergence of insect resistance to these insecticides is one of the major problems, which limit the use of neonicotinoids. The aim of our study is to better understand physiological changes appearing after subchronic exposure to sublethal doses of insecticide using complementary approaches that include toxicology, electrophysiology, molecular biology and calcium imaging...
August 12, 2017: Neurotoxicology
https://www.readbyqxmd.com/read/28810203/chemical-activity-and-distribution-of-emerging-pollutants-insights-from-a-multi-compartment-analysis-of-a-freshwater-system
#2
Pedro A Inostroza, Riccardo Massei, Romy Wild, Martin Krauss, Werner Brack
Emerging pollutants are ubiquitous in the aquatic system and may pose risks to aquatic ecosystems. The quantification and prediction of environmental partitioning of these chemicals in aquatic systems between water, sediment and biota is an important step in the comprehensive assessment of their sources and final fates in the environment. In this multi-compartment field study, we applied equilibrium partitioning theory and chemical activity estimates to investigate the predictability of concentrations in Gammarus pulex as a model invertebrate from water and sediment in a typical small central European river...
August 12, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28808317/bumblebee-colony-development-following-chronic-exposure-to-field-realistic-levels-of-the-neonicotinoid-pesticide-thiamethoxam-under-laboratory-conditions
#3
Dara A Stanley, Nigel E Raine
Neonicotinoid pesticides are used in agriculture to reduce damage from crop pests. However, beneficial insects such as bees can come into contact with these pesticides when foraging in treated areas, with potential consequences for bee declines and pollination service delivery. Honeybees are typically used as a model organism to investigate insecticide impacts on bees, but relatively little is known about impacts on other taxa such as bumblebees. In this experiment, we chronically exposed whole mature bumblebee (Bombus terrestris) colonies to field-realistic levels of the neonicotinoid thiamethoxam (2...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28806601/influence-of-sublethal-doses-of-acetamiprid-and-halosulfuron-methyl-on-metabolites-of-zebra-fish-brachydanio-rerio
#4
Hong Zhang, Lijuan Zhao
Acetamiprid, a neonicotinoid pesticide, is reported to have adverse sublethal effects on non-target beneficial organisms. Halosulfuron-methyl (HM), one of the most widely used herbicides in agriculture, has high ecotoxicity to aquatic plants and animals. In this study, a GC-MS-based metabolomics approach was used to investigate the toxicity of acetamiprid and HM. The Automated Mass Spectral Deconvolution and Identification System (AMDIS) software program and the retention index method were used to identify 51 metabolites in zebra fish (Brachydanio rerio)...
August 4, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28806553/thiacloprid-adsorption-and-leaching-in-soil-effect-of-the-composition-of-irrigation-solutions
#5
José Antonio Rodríguez-Liébana, M Dolores Mingorance, Aránzazu Peña
Pressure on groundwater resources has increased during the last decades due to the growing demand, especially in arid and semiarid regions, such as the Mediterranean basin, with frequent drought periods. In order to partially remediate this environmental problem of world concern, irrigation of agricultural lands with adequately treated wastewaters (TWW) is becoming a common management practice. The complex composition of these low-quality waters may influence the behavior of organic contaminants in soils. A calcareous soil with low organic carbon content was selected for the assessment of the adsorption and leaching of the neonicotinoid insecticide thiacloprid (THC)...
August 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28755688/differential-physiological-effects-of-neonicotinoid-insecticides-on-honey-bees-a-comparison-between-apis-mellifera-and-apis-cerana
#6
Zhiguo Li, Meng Li, Jingfang He, Xiaomeng Zhao, Veeranan Chaimanee, Wei-Fone Huang, Hongyi Nie, Yazhou Zhao, Songkun Su
Acute toxicities (LD50s) of imidacloprid and clothianidin to Apis mellifera and A. cerana were investigated. Changing patterns of immune-related gene expressions and the activities of four enzymes between the two bee species were compared and analyzed after exposure to sublethal doses of insecticides. Results indicated that A. cerana was more sensitive to imidacloprid and clothianidin than A. mellifera. The acute oral LD50 values of imidacloprid and clothianidin for A. mellifera were 8.6 and 2.0ng/bee, respectively, whereas the corresponding values for A...
August 2017: Pesticide Biochemistry and Physiology
https://www.readbyqxmd.com/read/28750898/the-use-of-a-unique-co-culture-model-of-fetoplacental-steroidogenesis-as-a-screening-tool-for-endocrine-disruptors-the-effects-of-neonicotinoids-on-aromatase-activity-and-hormone-production
#7
Elyse Caron-Beaudoin, Rachel Viau, Andrée-Anne Hudon-Thibeault, Cathy Vaillancourt, J Thomas Sanderson
Estrogen biosynthesis during pregnancy is dependent on the collaboration between the fetus producing the androgen precursors, and the placenta expressing the enzyme aromatase (CYP19). Disruption of estrogen production by contaminants may result in serious pregnancy outcomes. We used our recently developed in vitro co-culture model of fetoplacental steroidogenesis to screen the effects of three neonicotinoid insecticides on the catalytic activity of aromatase and the production of steroid hormones. A co-culture of H295R human adrenocortical carcinoma cells with fetal characteristics and BeWo human choriocarcinoma cells which display characteristics of the villous cytotrophoblast was exposed for 24h to various concentrations of three neonicotinoids: thiacloprid, thiamethoxam and imidacloprid...
July 24, 2017: Toxicology and Applied Pharmacology
https://www.readbyqxmd.com/read/28748329/impact-of-thiamethoxam-on-honey-bee-queen-apis-mellifera-carnica-reproductive-morphology-and-physiology
#8
Ivana Tlak Gajger, Martina Sakač, Aleš Gregorc
High honey bee losses around the world have been linked in part by the regular use of neonicotinoids in agriculture. In light of the current situation, the aim of this study was to investigate the effects of thiamethoxam on the development of the reproductive system and physiology in the honey bee queen. Two experimental groups of honey bee queen larvae were treated with thiamethoxam during artificial rearing, applied via artificial feed in two cycles. In the first rearing cycle, honey bee larvae received a single treatment dose (4...
July 26, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28740208/temporal-dynamics-of-whole-body-residues-of-the-neonicotinoid-insecticide-imidacloprid-in-live-or-dead-honeybees
#9
Matthias Schott, Gabriela Bischoff, Gerrit Eichner, Andreas Vilcinskas, Ralph Büchler, Marina Doris Meixner, Annely Brandt
In cases of acute intoxication, honeybees often lay in front of their hives for several days, exposed to sunlight and weather, before a beekeeper can take a sample. Beekeepers send samples to analytical laboratories, but sometimes no residues can be detected. Temperature and sun light could influence the decrease of pesticides in bee samples and thereby residues left for analysis. Moreover, samples are usually sent via normal postal services without cooling. We investigated the temporal dynamics of whole-body residues of imidacloprid in live or dead honeybees following a single-meal dietary exposure of 41 ng/bee under various environmental conditions, such as freezing, exposure to UV light or transfer of individuals through the mail system...
July 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28734106/insecticide-resistance-in-trialeurodes-vaporariorum-populations-and-novel-diagnostics-for-kdr-mutations
#10
Despoina Evr Kapantaidaki, Eldem Sadikoglou, Dimitra Tsakireli, Vasileios Kampanis, Marianna Stavrakaki, Corinna Schorn, Aris Ilias, Maria Riga, George Tsiamis, Ralf Nauen, George Skavdis, John Vontas, Anastasia Tsagkarakou
BACKGROUND: Neonicotinoids, pyrethroids and ketoenols, are currently used for the control of Trialeurodes vaporariorum (Hemiptera: Aleyrodidae). In this study, insecticide resistance status and mechanisms were investigated by classical bioassays and molecular techniques. RESULTS: Dose response bioassays were performed on 19 Greek populations, among the 35 different whitefly populations used for the whole analysis. Resistance factors scaled up to 207-, 4657- and 59- fold, for imidacloprid, bifenthrin and spiromesifen, respectively...
July 22, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28711004/investigation-of-the-presence-and-endocrine-activities-of-pesticides-found-in-wastewater-effluent-using-yeast-based-bioassays
#11
Paul Westlund, Viviane Yargeau
This study investigated the presence of a variety of pesticides (herbicides, fungicides, and insecticides) in effluent of three wastewater treatment plants as well as their endocrine activities using yeast-based in vitro assays. Although the presence of these contaminants of emerging concern is frequently reported to be present throughout the environment, their presence in wastewater treatment plants has been seldom studied. Of the 18 compounds investigated in this study, imidacloprid was the only compound not detected in all three WWTPs...
July 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28704996/imidacloprid-promotes-high-fat-diet-induced-adiposity-in-female-c57bl-6j-mice-and-enhances-adipogenesis-in-3t3-l1-adipocytes-via-the-ampk%C3%AE-mediated-pathway
#12
Quancai Sun, Weipeng Qi, Xiao Xiao, Szu-Hao Yang, Daeyoung Kim, Kyong Sup Yoon, John M Clark, Yeonhwa Park
Imidacloprid, a neonicotinoid insecticide, was previously reported to enhance adipogenesis and resulted in insulin resistance in cell culture models. It was also reported to promote high fat diet-induced obesity and insulin resistance in male C57BL/6J mice. Thus, the goal of the present study was to determine the effects of imidacloprid and dietary fat interaction on the development of adiposity and insulin resistance in female C57BL/6J mice. Mice were fed with a low (4% w/w) or high fat (20% w/w) diet containing imidacloprid (0...
July 27, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28686249/introductory-lecture-atmospheric-chemistry-in-the-anthropocene
#13
Barbara J Finlayson-Pitts
The term "Anthropocene" was coined by Professor Paul Crutzen in 2000 to describe an unprecedented era in which anthropogenic activities are impacting planet Earth on a global scale. Greatly increased emissions into the atmosphere, reflecting the advent of the Industrial Revolution, have caused significant changes in both the lower and upper atmosphere. Atmospheric reactions of the anthropogenic emissions and of those with biogenic compounds have significant impacts on human health, visibility, climate and weather...
July 7, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28682063/history-matters-pre-exposure-to-wastewater-enhances-pesticide-toxicity-in-invertebrates
#14
Jochen P Zubrod, Dominic Englert, Simon Lüderwald, Sandra Poganiuch, Ralf Schulz, Mirco Bundschuh
Disturbance regimes determine communities' structure and functioning. Nonetheless, little effort has been undertaken to understand interactions of press and pulse disturbances. In this context, leaf-shredding macroinvertebrates can be chronically exposed to wastewater treatment plant effluents (i.e., press disturbance) before experiencing pesticide exposure following agricultural runoff (i.e., pulse disturbance). It is assumed that wastewater pre-exposure alters animals' sensitivity to pesticides. To test this hypothesis, we exposed model-populations of the shredder Gammarus fossarum to wastewater at three field-relevant dilution levels (i...
July 25, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28680118/immunosuppression-in-honeybee-queens-by-the-neonicotinoids-thiacloprid-and-clothianidin
#15
Annely Brandt, Katharina Grikscheit, Reinhold Siede, Robert Grosse, Marina Doris Meixner, Ralph Büchler
Queen health is crucial to colony survival of honeybees, since reproduction and colony growth rely solely on the queen. Queen failure is considered a relevant cause of colony losses, yet few data exist concerning effects of environmental stressors on queens. Here we demonstrate for the first time that exposure to field-realistic concentrations of neonicotinoid pesticides can severely affect the immunocompetence of queens of western honeybees (Apis mellifera L.). In young queens exposed to thiacloprid (200 µg/l or 2000 µg/l) or clothianidin (10 µg/l or 50 µg/l), the total hemocyte number and the proportion of active, differentiated hemocytes was significantly reduced...
July 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28663503/chronic-exposure-to-neonicotinoids-reduces-honey-bee-health-near-corn-crops
#16
N Tsvetkov, O Samson-Robert, K Sood, H S Patel, D A Malena, P H Gajiwala, P Maciukiewicz, V Fournier, A Zayed
Experiments linking neonicotinoids and declining bee health have been criticized for not simulating realistic exposure. Here we quantified the duration and magnitude of neonicotinoid exposure in Canada's corn-growing regions and used these data to design realistic experiments to investigate the effect of such insecticides on honey bees. Colonies near corn were naturally exposed to neonicotinoids for up to 4 months-the majority of the honey bee's active season. Realistic experiments showed that neonicotinoids increased worker mortality and were associated with declines in social immunity and increased queenlessness over time...
June 30, 2017: Science
https://www.readbyqxmd.com/read/28663502/country-specific-effects-of-neonicotinoid-pesticides-on-honey-bees-and-wild-bees
#17
B A Woodcock, J M Bullock, R F Shore, M S Heard, M G Pereira, J Redhead, L Ridding, H Dean, D Sleep, P Henrys, J Peyton, S Hulmes, L Hulmes, M Sárospataki, C Saure, M Edwards, E Genersch, S Knäbe, R F Pywell
Neonicotinoid seed dressings have caused concern world-wide. We use large field experiments to assess the effects of neonicotinoid-treated crops on three bee species across three countries (Hungary, Germany, and the United Kingdom). Winter-sown oilseed rape was grown commercially with either seed coatings containing neonicotinoids (clothianidin or thiamethoxam) or no seed treatment (control). For honey bees, we found both negative (Hungary and United Kingdom) and positive (Germany) effects during crop flowering...
June 30, 2017: Science
https://www.readbyqxmd.com/read/28649467/larval-exposure-to-field-realistic-concentrations-of-clothianidin-has-no-effect-on-development-rate-over-winter-survival-or-adult-metabolic-rate-in-a-solitary-bee-osmia-bicornis
#18
Elizabeth Nicholls, Robert Fowler, Jeremy E Niven, James D Gilbert, Dave Goulson
There is widespread concern regarding the effects of agro-chemical exposure on bee health, of which neonicotinoids, systemic insecticides detected in the pollen and nectar of both crops and wildflowers, have been the most strongly debated. The majority of studies examining the effect of neonicotinoids on bees have focussed on social species, namely honey bees and bumble bees. However, most bee species are solitary, their life histories differing considerably from these social species, and thus it is possible that their susceptibility to pesticides may be quite different...
2017: PeerJ
https://www.readbyqxmd.com/read/28645084/application-of-the-combination-index-ci-isobologram-equation-to-research-the-toxicological-interactions-of-clothianidin-thiamethoxam-and-dinotefuran-in-honeybee-apis-mellifera
#19
Yanmei Liu, Sihong Liu, Hui Zhang, Yanping Gu, Xuesheng Li, Mingyuan He, Huihua Tan
Due to complex pest control scenarios and the needs of agricultural production, different neonicotinoids may be used in certain agricultural applications. Consequently, honeybees may be exposed to these substances through distribution throughout plant tissues via the vascular system through several pathways, such as surface water, the exudates excreted from plants, and air pollution via drift of dust as well as contaminated pollen and nectar. In the current study, the single and combined toxicity of clothianidin, dinotefuran, and thiamethoxam to honeybees was examined after 48 h exposure by the acute oral method and combination index (CI)-isobologram equation...
October 2017: Chemosphere
https://www.readbyqxmd.com/read/28643160/residual-ground-water-levels-of-the-neonicotinoid-thiacloprid-perturb-chemosensing-of-caenorhabditis-elegans
#20
Hannah Hopewell, Kieran G Floyd, Daniel Burnell, John T Hancock, Joel Allainguillaume, Michael R Ladomery, Ian D Wilson
This study investigated the neurological effects of residual ground-water levels of thiacloprid on the non-target organism Caenorhabditis elegans. Nematodes treated with thiacloprid showed a dose-dependent and significantly increased twitch response at concentrations above 50 ng mL(-1) that disabled their forward locomotion in liquid culture. In comparison with untreated controls, 10 ng mL(-1) thiacloprid perturbed the chemosensory ability of C. elegans such that the nematodes no longer demonstrated positive chemotaxis towards a NaCl chemo-attractant, reducing their chemotaxis index from +0...
June 22, 2017: Ecotoxicology
keyword
keyword
46536
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"