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https://www.readbyqxmd.com/read/29164468/assessment-of-water-resource-contamination-by-pesticides-in-vegetable-producing-areas-in-burkina-faso
#1
Edouard Lehmann, Morgan Fargues, Jean-Jacques Nfon Dibié, Yacouba Konaté, Luiz Felippe de Alencastro
This study proposes a comprehensive approach to investigate water resource contamination by pesticides under the specific climatic and hydrological conditions of the Sudano-Sahelian climate. Samples were collected from traditional wells, boreholes, and a lake in Burkina Faso. A multiresidue analysis was developed for 25 pesticides identified during field surveys. Polar organic chemical integrative samplers (POCIS) were used to confirm trends observed with grab samples. Uptake kinetics of POCIS were assessed by in situ calibration...
November 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29162882/sublethal-effects-of-imidacloprid-on-targeting-muscle-and-ribosomal-protein-related-genes-in-the-honey-bee-apis-mellifera-l
#2
Yan-Yan Wu, Qi-Hua Luo, Chun-Sheng Hou, Qiang Wang, Ping-Li Dai, Jing Gao, Yong-Jun Liu, Qing-Yun Diao
A sublethal concentration of imidacloprid can cause chronic toxicity in bees and can impact the behavior of honey bees. The nectar- and water-collecting, and climbing abilities of bees are crucial to the survival of the bees and the execution of responsibilities in bee colonies. Besides behavioral impact, data on the molecular mechanisms underlying the toxicity of imidacloprid, especially by the way of RNA-seq at the transcriptomic level, are limited. We treated Apis mellifera L. with sublethal concentrations of imidacloprid (0...
November 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29157187/quantitative-weight-of-evidence-assessment-of-higher-tier-studies-on-the-toxicity-and-risks-of-neonicotinoid-insecticides-in-honeybees-1-methods
#3
Keith R Solomon, Gladys L Stephenson
A quantitative weight of evidence (QWoE) methodology was developed and used to assess many higher-tier studies on the effects of three neonicotinoid insecticides: clothianidin (CTD), imidacloprid (IMI), and thiamethoxam (TMX) on honeybees. A general problem formulation, a conceptual model for exposures of honeybees, and an analysis plan were developed. A QWoE methodology was used to characterize the quality of the available studies from the literature and unpublished reports of studies conducted by or for the registrants...
November 20, 2017: Journal of Toxicology and Environmental Health. Part B, Critical Reviews
https://www.readbyqxmd.com/read/29157159/quantitative-weight-of-evidence-assessment-of-risk-to-honeybee-colonies-from-use-of-imidacloprid-clothianidin-and-thiamethoxam-as-seed-treatments-a-postscript
#4
Keith R Solomon, Gladys L Stephenson
This paper is a postscript to the four companion papers in this issue of the Journal (Solomon and Stephenson 2017a , 2017b ; Stephenson and Solomon 2017a , 2017b ). The first paper in the series described the conceptual model and the methods of the QWoE process. The other three papers described the application of the QWoE process to studies on imidacloprid (IMI), clothianidin (CTD), and thiamethoxam (TMX). This postscript was written to summarize the utility of the methods used in the quantitative weight of evidence (QWoE), the overall relevance of the results, and the environmental implications of the findings...
November 20, 2017: Journal of Toxicology and Environmental Health. Part B, Critical Reviews
https://www.readbyqxmd.com/read/29143660/efficacy-of-10-imidacloprid-%C3%A2-2-5-moxidectin-topical-solution-advantage-multi-%C3%A2-for-dogs-for-the-prevention-of-heartworm-disease-and-infection-all-month-long
#5
Dwight D Bowman, Cameon M Ohmes, Joseph A Hostetler, Daniel J Keil, Terry L Settje, Samuel D Charles
BACKGROUND: Prior work has shown that the levels of moxidectin in dogs treated with Advantage Multi® for Dogs (Bayer Animal Health) remain at a high plasma concentration for the full month after application. The objective of this study was to demonstrate the efficacy of 10% imidacloprid + 2.5% moxidectin topical solution (Advantage Multi® for Dogs, also known as Advocate® for Dogs) for the prevention of heartworm infection and disease 30 days after just one application. METHODS: Two groups of eight dogs each were included...
November 9, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/29140765/quantitative-weight-of-evidence-assessment-of-higher-tier-studies-on-the-toxicity-and-risks-of-neonicotinoids-in-honeybees-2-imidacloprid
#6
Gladys L Stephenson, Keith R Solomon
A quantitative weight of evidence (QWoE) methodology was used to assess higher-tier studies on the effects of imidacloprid (IMI) on honeybees. Assessment endpoints were population size and viability of commercially managed bees and quantity of hive products. A colony-level no-observed-adverse effect concentration (NOAEC) of 25 µg IMI/kg syrup, equivalent to an oral no-observed-adverse-effect-dose of 7.3 ng/bee/d for all responses, was measured. The overall weight of evidence indicates that there is minimal risk to honeybees from exposure to IMI from its use as a seed treatment...
November 15, 2017: Journal of Toxicology and Environmental Health. Part B, Critical Reviews
https://www.readbyqxmd.com/read/29133226/the-effect-of-dietary-neonicotinoid-pesticides-on-non-flight-thermogenesis-in-worker-bumble-bees-bombus-terrestris
#7
Robert Potts, Rebecca M Clarke, Sophie E Oldfield, Lisa K Wood, Natalie Hempel de Ibarra, James E Cresswell
For bumble bees (genus Bombus), the capacity for non-flight thermogenesis is essential for two fundamental processes undertaken by adult workers, namely recovery from torpor after chilling and brood incubation. Farmland bees can be widely exposed to dietary residues of neurotoxic neonicotinoid insecticides that appear in the nectar and pollen of treated bee-attractive crops, which may harm them. An earlier study shows that dietary neonicotinoids cause complex alterations to thermoregulation in honey bees, but their effects on the thermogenic capabilities of individual bumble bees has been untested previously...
November 10, 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/29128258/assessment-of-human-exposure-to-pesticides-by-hair-analysis-the-case-of-vegetable-producing-areas-in-burkina-faso
#8
Edouard Lehmann, Christelle Oltramare, Jean-Jacques Nfon Dibié, Yacouba Konaté, Luiz Felippe de Alencastro
The present work assesses human exposure to pesticides in vegetable-producing areas in Burkina Faso, using hair as an indicator. The study design includes a comparison between operators who are occupationally exposed while working in the fields and a reference population (i.e. not occupationally exposed) to evaluate both occupational and indirect exposures. Hair samples from volunteers (n=101) were positive for 17 pesticides (38 analyzed). Acetamiprid, desethylatrazine, carbofuran, and deltamethrin were detected for the first time in field samples...
November 8, 2017: Environment International
https://www.readbyqxmd.com/read/29127660/exposure-to-a-sublethal-concentration-of-imidacloprid-and-the-side-effects-on-target-and-nontarget-organs-of-apis-mellifera-hymenoptera-apidae
#9
Aline Fernanda Catae, Thaisa Cristina Roat, Marcel Pratavieira, Anally Ribeiro da Silva Menegasso, Mario Sergio Palma, Osmar Malaspina
The use of insecticides has become increasingly frequent, and studies indicate that these compounds are involved in the intoxication of bees. Imidacloprid is a widely used neonicotinoid; thus, we have highlighted the importance of assessing its oral toxicity to Africanized bees and used transmission electron microscopy to investigate the sublethal effects in the brain, the target organ, and the midgut, responsible for the digestion/absorption of food. In addition, the distribution of proteins involved in important biological processes in the brain were evaluated on the 1st day of exposure by MALDI-imaging analysis...
November 10, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/29123163/imidacloprid-and-chlorpyrifos-insecticides-impair-migratory-ability-in-a-seed-eating-songbird
#10
Margaret L Eng, Bridget J M Stutchbury, Christy A Morrissey
Birds that travel long distances between their wintering and breeding grounds may be particularly susceptible to neurotoxic insecticides, but the influence of insecticides on migration ability is poorly understood. Following acute exposure to two widely used agricultural insecticides, imidacloprid (neonicotinoid) and chlorpyrifos (organophosphate), we compared effects on body mass, migratory activity and orientation in a seed-eating bird, the white-crowned sparrow (Zonotrichia leucophrys). During spring migration, sparrows were captured, held and dosed by gavage daily for 3 days with either the vehicle control, low (10% LD50) or high (25% LD50) doses of imidacloprid or chlorpyrifos and tested in migratory orientation trials pre-exposure, post-exposure and during recovery...
November 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29109044/target-vs-non-target-analysis-to-determine-pesticide-residues-in-fruits-from-saudi-arabia-and-influence-in-potential-risk-associated-with-exposure
#11
Yolanda Picó, Mohamed A El-Sheikh, Ahmed H Alfarhan, Damià Barceló
The occurrence of pesticide residues in fruits was determined by a target method for 62 analytes and a wide scope screening method against a database of 500 pesticides. Limits of quantification (LOQs) were from 0.5 to 6.3 μg kg(-1) for the target method and from 0.5 to 119 μg kg(-1) for the non-target. Thirty samples: dates, apples, oranges, tangerines, lemons and grapefruits were selected because their high consumption, except lemons and grapefruits that were to cover all citrus fruits. Using the target method, 15 compounds (mostly insecticides and fungicides) out of 62 pesticides (organophosphorus, carbamates, pyrethroids, chloroacetanilides, triazines, triazoles, imidazoles, etc...
November 9, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29107232/characterization-of-heat-shock-protein-70-transcript-from-nilaparvata-lugens-st%C3%A3-l-its-response-to-temperature-and-insecticide-stresses
#12
Kai Lu, Xia Chen, Wenting Liu, Zhichao Zhang, Ying Wang, Keke You, Yue Li, Rongbin Zhang, Qiang Zhou
The brown planthopper, Nilaparvata lugens, possesses a strong adaptability to extreme temperature and insecticide stresses. Heat shock proteins (Hsps) are highly conserved molecular chaperones and play a pivotal role in response to various environmental stresses in insects. However, little is known about the response of Hsps to stresses in N. lugens. In the present study, an inducible Hsp70 (NlHsp70) was isolated from this insect and transcriptional expression patterns of NlHsp70 under temperature and insecticide stresses were analyzed...
October 2017: Pesticide Biochemistry and Physiology
https://www.readbyqxmd.com/read/29107229/seasonal-implications-on-toxicity-biomarkers-of-loricariichthys-anus-valenciennes-1835-from-a-subtropical-reservoir
#13
Aline Monique Blank do Amaral, Jeane de Lima Costa Gomes, Gustavo Henrique Weimer, Aline Teixeira Marins, Vania Lucia Loro, Renato Zanella
Cropping systems based on intensive land use and continuous application of agricultural chemicals inflict a threat to aquatic organisms since these substances will inevitably be carried in to water bodies where they can accumulate, particularly in lentic sites. Pesticides exposure in aquatic animals can cause changes that can be quantified through biomarkers. Thus, this study aimed to investigate the effects of season on oxidative stress and neurotoxicity biomarkers in Loricariichthys anus from a subtropical reservoir surrounded by agricultural areas in southern Brazil...
October 21, 2017: Chemosphere
https://www.readbyqxmd.com/read/29102665/perinatal-exposure-to-low-dose-imidacloprid-causes-adhd-like-symptoms-evidences-from-an-invertebrate-model-study
#14
Seoyoung Kim, Hee-Seok Lee, Yooheon Park
The fundamental diagnoses of attention deficit hyperactivity disorder (ADHD) and autism consists of inattention, hyperactivity, and impulsivity, which lead to abnormal social interactions and repetitive and restricted behavior. Several food contaminants are suspected of being a possible contributing factor to the present-day increase in diseases, such as obesity and ADHD, and pesticides are also considered as a contributor to the increased prevalence of ADHD. Imidacloprid is a neonicotinoid insecticide with lower toxicity to mammals...
November 2, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29102172/effects-of-chronic-pollution-and-water-flow-intermittency-on-stream-biofilms-biodegradation-capacity
#15
Marko Rožman, Vicenç Acuña, Mira Petrović
A mesocosm case study was conducted to gain understanding and practical knowledge on biofilm emerging contaminants biodegradation capacity under stressor and multiple stressor conditions. Two real life scenarios: I) biodegradation in a pristine intermittent stream experiencing acute pollution and II) biodegradation in a chronically polluted intermittent stream, were examined via a multifactorial experiment using an artificial stream facility. Stream biofilms were exposed to different water flow conditions i...
October 25, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29097282/isolation-of-carboxylesterase-esterase-fe4-from-apis-cerana-cerana-and-its-role-in-oxidative-resistance-during-adverse-environmental-stress
#16
Manli Ma, Haihong Jia, Xuepei Cui, Na Zhai, Hongfang Wang, Xingqi Guo, Baohua Xu
Carboxylesterases (CarEs) play vital roles in metabolising different physiologically important endogenous compounds and in detoxifying various harmful exogenous compounds in insects. Multiple studies of CarEs have focused on pesticide metabolism in insects, while few studies have aimed to identify CarE functions in oxidative resistance, particularly in Apis cerana cerana. In this study, we isolated a carboxylesterase gene, esterase FE4, from Apis cerana cerana and designated it towards an exploration of its roles as an antioxidant and in detoxification...
October 30, 2017: Biochimie
https://www.readbyqxmd.com/read/29096261/neonicotinoid-insecticides-imidacloprid-guadipyr-and-cycloxaprid-induce-acute-oxidative-stress-in-daphnia-magna
#17
Suzhen Qi, Donghui Wang, Lizhen Zhu, Miaomiao Teng, Chengju Wang, Xiaofeng Xue, Liming Wu
Cycloxaprid (CYC) and guadipyr (GUA) are two new and promising neonicotinoid insecticides whose effects on Daphnia magna are as yet unknown. In this study, the acute toxicities of CYC and GUA to D. magna, including immobilization and embryo-hatching inhibition, and their effects on antioxidant enzymes and related gene expression were determined after a 48-h exposure. Imidacloprid (IMI) was evaluated at the same time as a reference agent. The 48-h EC50 values of IMI, GUA, and CYC for neonate immobilization were 13...
October 30, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29095522/phenotypic-responses-in-caenorhabditis-elegans-following-chronic-low-level-exposures-to-inorganic-and-organic-compounds
#18
Fidelis Mugova, Daniel S Read, Matthew J Riding, Francis L Martin, William Tyne, Claus Svendsen, David Spurgeon
Responses of organisms to sub-lethal exposure of environmental stressors can be difficult to detect. We investigated phenotypic changes in the tissue of Caenorhabditis elegans via Raman spectroscopy, as well as survival and reproductive output when exposed to chronic low dose of exposure metals (copper, zinc or silver), an herbicide (diuron) and a pesticide (imidacloprid). Raman spectroscopy measures changes in phenotype by providing information about the molecular composition and relative abundance of biomolecules...
November 2, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29091903/chemoprotective-role-of-ethanol-extract-of-urtica-urens-l-against-the-toxicity-of-imidacloprid-on-endocrine-disruption-and-ovarian-morphometric-in-female-rats-gc-ms-analysis
#19
Massara Mzid, Zohra Ghlissi, Maryem Ben Salem, Sameh Ben Khedir, Khansa Chaabouni, Fatma Ayedi, Zouheir Sahnoun, Ahmed Hakim, Tarek Rebai
Imidacloprid (IMI) is a widely used in Tunisia and abroad, and high doses of IMI have been known to cause endocrine disruption. Some reports claim that Urtica urens L. (UU) can reduce toxicity thanks to it anti-inflammatory and antioxidant activities, but there is no scientific evidence justifying its use, which lets us think to its direct effect on the metabolism of the ovarian tissue. The present study was undertaken to evaluate the protective effect of UU against the toxicity of Confidor(®), whose active substance is imidacloprid (IMI), in female rat, as well as the chemical compositions of UU ethanol (EtOH) extract by GC-MS...
October 28, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29080359/uptake-and-dissipation-of-neonicotinoid-residues-in-nectar-and-foliage-of-systemically-treated-woody-landscape-plants
#20
Bernadette M Mach, Svetlana Bondarenko, Daniel A Potter
Systemic neonicotinoid insecticides used in urban arboriculture could pose a risk to bees and other pollinators foraging on treated plants. We measured uptake and dissipation of soil-applied imidacloprid and dinotefuran in nectar and leaves of two woody plant species, a broadleaf evergreen tree (Ilex × attenuata) and a deciduous shrub (Clethra alnifolia) to assess concentrations to which pollinators and pests might be exposed in landscape settings. Three application timings, autumn (post-bloom), spring (pre-bloom), or summer (early post-bloom), were evaluated to see if taking advantage of differences in the neonicotinoids' systemic mobility and persistence might enable pest control while minimizing transference into nectar...
October 28, 2017: Environmental Toxicology and Chemistry
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