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https://www.readbyqxmd.com/read/28549368/developing-population-models-a-systematic-approach-for-pesticide-risk-assessment-using-herbaceous-plants-as-an-example
#1
Amelie Schmolke, Katherine E Kapo, Pamela Rueda-Cediel, Pernille Thorbek, Richard Brain, Valery Forbes
Population models are used as tools in species management and conservation and are increasingly recognized as important tools in pesticide risk assessments. A wide variety of population model applications and resources on modeling techniques, evaluation and documentation can be found in the literature. In this paper, we add to these resources by introducing a systematic, transparent approach to developing population models. The decision guide that we propose is intended to help model developers systematically address data availability for their purpose and the steps that need to be taken in any model development...
May 22, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28549275/understanding-the-relationships-between-water-quality-recreational-fishing-practices-and-human-health-in-phoenix-arizona
#2
E Pulford, B A Polidoro, M Nation
Across the United States, recreational freshwater fisheries are not only an important leisure activity, but can also provide a relatively inexpensive source of protein in local diets. However, recreational freshwater fisheries are generally not well-monitored in terms of fish consumption vs. catch and release, nor are all recreational surface waters regularly monitored for the presence of potentially harmful contaminants in water or fishes. In six urban lakes that support recreational fisheries in Phoenix, Arizona, a majority of surveyed anglers reported eating recreationally caught fishes, even though they thought the water might be polluted...
May 23, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28547568/biofertilizers-and-sustainable-agriculture-exploring-arbuscular-mycorrhizal-fungi
#3
REVIEW
Nicholas O Igiehon, Olubukola O Babalola
Worldwide agricultural food production has to double in 2050 so as to feed the global increasing population while reducing dependency on conventional chemical fertilizers plus pesticides. To accomplish this objective, there is the need to explore the several mutualistic interactions between plant roots and rhizosphere microbiome. Biofertilization is the process of boosting the abundance of microorganisms such as arbuscular mycorrhizal fungi (AMF) in the natural plant rhizosphere which depicts a beneficial alternative to chemical fertilization practices...
May 25, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28545729/development-of-fast-efficient-and-ecological-method-employing-vortex-assisted-dispersive-liquid-liquid-microextraction-combined-with-fast-gas-chromatography-mass-spectrometry-for-pesticide-residues-analysis-in-alcohol-content-samples
#4
Svetlana Hrouzková, Mária Brišová, Agneša Szarka
A fast, ecological, and efficient method employing vortex-assisted dispersive liquid-liquid microextraction (DLLME) method for isolation and preconcentration of selected endocrine disrupting pesticides from beverages containing some degree of alcohol was developed. The effect of several extraction parameters, such as selection of extractive solvent, its volume and extraction time, the salt addition was investigated. Four different extractive solvents (chloroform, tetrachloroethane, tetrachloromethane and toluene) and their combinations were evaluated for DLLME...
May 17, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28543984/cycle-affects-imidacloprid-efficiency-by-mediating-cytochrome-p450-expression-in-the-brown-planthopper-nilaparvata-lugens
#5
K Kang, P Yang, R Pang, L Yue, W Zhang
Circadian clocks influence most behaviours and physiological activities in animals, including daily fluctuations in metabolism. However, how the clock gene cycle influences insects' responses to pesticides has rarely been reported. Here, we provide evidence that cycle affects imidacloprid efficacy by mediating the expression of cytochrome P450 genes in the brown planthopper (BPH) Nilaparvata lugens, a serious insect pest of rice. Survival bioassays showed that the susceptibility of BPH adults to imidacloprid differed significantly between the two time points tested [Zeitgeber Time 8 (ZT8) and ZT4]...
May 23, 2017: Insect Molecular Biology
https://www.readbyqxmd.com/read/28542407/the-influence-of-persistent-organic-pollutants-in-the-traditional-inuit-diet-on-markers-of-inflammation
#6
L K Schæbel, E C Bonefeld-Jørgensen, H Vestergaard, S Andersen
Concentrations of persistent organic pollutants (POPs) are high in Inuit living predominately on the traditional marine diet. Adverse effects of POPs include disruption of the immune system and cardiovascular diseases that are frequent in Greenland Inuit. We aimed to assess the association between exposure to POPs from the marine diet and inflammation, taking into account other factors such as vitamin D. We invited Inuit and non-Inuit living in settlements or the town in rural East Greenland or in the capital city Nuuk...
2017: PloS One
https://www.readbyqxmd.com/read/28541776/enantioselective-apoptosis-and-oxidative-damage-induced-by-individual-isomers-of-profenofos-in-primary-hippocampal-neurons
#7
Xian T Lu, Yun Ma, Hang J Zhang, Mei Q Jin, Jun H Tang
The purpose of this study was to investigate the apoptosis-related cytotoxic effects and molecular mechanisms of individual isomers of profenofos (PFF) on primary hippocampal neurons at 1.0 to 20 mg L(-1). The cell viability and lactate dehydrogenase (LDH) efflux indicated that (-)-PFF exposure was associated with more toxic effects than (+)-PFF above the concentration of 5 mg L(-1) (P < 0.5). Flow cytometric results showed that the percentages of apoptotic cells incubated with 20 mg L(-1) (-)-PFF, (+)-PFF and rac-PFF for 24 h reached 23...
May 25, 2017: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/28541668/matrix-effects-and-interferences-of-different-citrus-fruits-co-extractives-in-pesticide-residue-analysis-using-ultra-high-performance-liquid-chromatography-high-resolution-mass-spectrometry
#8
Natalia Besil, Veronica Cesio, Horacio Heinzen, Amadeo R Fernández-Alba
The matrix effects of ethyl acetate extracts from seven different citrus fruits on the determination of 80 pesticide residues using liquid chromatography coupled to high resolution time of flight mass spectrometry (UHPLC-(ESI)-HR-TOF) at 4 GHz resolution mode were studied. Only 20% of the evaluated pesticides showed noticeable matrix effects (ME) due to co-elution with natural products between tR=3-11 minutes. Principal components analysis (PCA) of the co-extractives detected grouped the mandarins and the orange varieties, but separated lemon, oranges, and mandarins from each other...
May 25, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28541664/prediction-of-collision-cross-section-values-for-small-molecules-application-to-pesticide-residue-analysis
#9
Lubertus Bijlsma, Richard Bade, Alberto Celma, Lauren Mullin, Gareth Cleland, Sara Stead, Felix Hernandez, Juan Vicente Sancho
The use of collision cross-section (CCS) values obtained by ion mobility high-resolution mass spectrometry has added a third dimension (alongside retention time and exact mass) to aid in the identification of compounds. However, its utility is limited by the number of experimental CCS values currently available. This work demonstrates the potential of artificial neural networks (ANNs) for the prediction of CCS values of pesticides. The predictor, based on eight software-chosen mo-lecular descriptors, was optimised using CCS values of 205 small molecules and validated using a set of 131 pesticides...
May 25, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28541563/the-double-stranded-rna-binding-protein-rde-4-can-act-cell-autonomously-during-feeding-rnai-in-c-elegans
#10
Pravrutha Raman, Soriayah M Zaghab, Edward C Traver, Antony M Jose
Long double-stranded RNA (dsRNA) can silence genes of matching sequence upon ingestion in many invertebrates and is therefore being developed as a pesticide. Such feeding RNA interference (RNAi) is best understood in the worm Caenorhabditis elegans, where the dsRNA-binding protein RDE-4 initiates silencing by recruiting an endonuclease to process long dsRNA into short dsRNA. These short dsRNAs are thought to move between cells because muscle-specific rescue of rde-4 using repetitive transgenes enables silencing in other tissues...
May 24, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28541121/investigation-of-the-binding-and-simultaneous-quantifications-of-propanil-and-bromoxynil-herbicide-concentrations-in-human-serum-albumin
#11
Eric Appah, Brianda Elzey, Sayo O Fakayode
This study reported the use of UV-visible and fluorescence spectroscopy and partial-least-square (PLS) multivariate regression for accurate and simultaneous quantifications of two widely used herbicides, propanil, 3',4'-dichloropropionanilide (PPL) and bromoxynil, 3,5-dibromo-4-hydroxybenzonitrile (BXL) in human serum albumin (HSA) at physiological conditions. The binding affinity and thermodynamic properties of PPL-HSA and BXL-HSA complexes were also investigated. Partial-least-square (PLS) regression was used to collate the variability in the absorption or emission spectra of PPL-HSA and BXL-HSA complexes with PPL and/or BXL concentrations in HSA samples...
May 25, 2017: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/28541098/the-impact-of-pesticides-on-oxidative-stress-level-in-human-organism-and-their-activity-as-an-endocrine-disruptor
#12
Agata Jabłońska-Trypuć, Elżbieta Wołejko, Urszula Wydro, Andrzej Butarewicz
Pesticides cause serious environmental and health problems both to humans and animals. The aim of this review is to discuss selected herbicides and fungicides regarding their mode of action and their influence on basic oxidative stress parameters and endocrine disruption properties tested in selected cell cultures in vitro. Because of numerous difficulties which animal studies are subject to, cell cultures are an excellent experimental model reflecting human exposure to different pesticides through all relevant routes...
May 25, 2017: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/28540722/ultrafast-screening-and-quantitation-of-pesticides-in-food-and-environmental-matrices-by-solid-phase-microextraction-transmission-mode-spme-tm-and-direct-analysis-in-real-time-dart
#13
German Augusto Gómez-Ríos, Emanuela Gionfriddo, Justen J Poole, Janusz Pawliszyn
The direct interface of microextraction technologies to Mass Spectrometry (MS) has unquestionably revolutionized the speed and efficacy at which complex matrices are analyzed. Solid Phase Micro Extraction-Transmission Mode (SPME-TM) is a technology conceived as an effective synergy between sample preparation and ambient ionization. Succinctly, the device consists of a mesh coated with polymeric particles that extract analytes of interest present in a given sample matrix. This coated-mesh acts as a transmission mode substrate for Direct Analysis in Real Time (DART), allowing for rapid and efficient thermal-desorption/ionization of analytes previously concentrated on the coating, and dramatically lowering limits of detection attained by sole DART analysis...
May 25, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28540662/methamidophos-an-organophosphorus-insecticide-induces-pro-aggressive-behaviour-in-mice
#14
Cristina Paula do Nascimento, Gabriella Xavier Maretto, Graziany Leite Moreira Marques, Luciana Mesquita Passamani, Ana Paula Abdala, Luiz Carlos Schenberg, Vanessa Beijamini, Karla Nívea Sampaio
Although evidence indicates that exposure to organophosphorus (OP) pesticides induces neurobehavioral disorders, little is known about the effects of OP on aggressive behaviour. Our study investigated the effects of repeated exposure to an OP pesticide, methamidophos, on the isolation-induced aggressive behaviour in mice. Forty seven male mice were individually housed for a month. Socially isolated animals were then confronted with a standard non-isolated opponent for 15 min (pre-treatment trial), and the latency and frequency of aggressive and general exploratory behaviours were recorded...
May 24, 2017: Neurotoxicity Research
https://www.readbyqxmd.com/read/28540444/organochlorine-pesticides-residues-in-human-breast-milk-from-the-middle-governorates-in-jordan-in-2013-2014
#15
Tawfiq M Al Antary, Mahmoud A Alawi, Hussein Estityah, Nizar Haddad
One hundred samples of mother breast milk were gathered from six middle governorates and districts in Jordan in 2013/2014 to monitor Organochlorine pesticides pollutants. The results showed clearly that banned organochlorine pesticides are still detected in the monitored samples in low concentration despite banning of these persistent pollutants in Jordan since 36 years ago. However, the results indicated that 1% of the contaminated samples contained β-HCH, 5% γ-HCH, 3% p,p'-DDD, 2% heptachlor, 45% p,p'-DDE and 3% p,p'-DDT...
May 24, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28539253/documenting-the-kinetic-time-course-of-lambda-cyhalothrin-metabolites-in-orally-exposed-volunteers-for-the-interpretation-of-biomonitoring-data
#16
Rania Khemiri, Jonathan Côté, Hamadi Fetoui, Michèle Bouchard
Lambda-cyhalothrin is a pyrethroid pesticide largely used in agriculture. Exposure assessment can be performed by measuring key urinary metabolites. For a proper use of biomonitoring data, it is however important to gain information on the toxicokinetics of these key biomarkers of exposure. A human volunteer study was performed to document the plasma and urinary time courses of major lambda-cyhalothrin metabolites. Seven volunteers ingested 0.025mgkg(-1) body weight of lambda-cyhalothrin. Blood samples were withdrawn prior to dosing and at fixed time periods over the 72 h-period following ingestion and complete urine voids were collected pre-exposure and at pre-established intervals over 84h post-dosing...
May 21, 2017: Toxicology Letters
https://www.readbyqxmd.com/read/28539089/simulating-real-life-exposures-to-uncover-possible-risks-to-human-health-a-proposed-consensus-for-a-novel-methodological-approach
#17
A M Tsatsakis, D Kouretas, M N Tzatzarakis, P Stivaktakis, K Tsarouhas, K S Golokhvast, V N Rakitskii, V A Tutelyan, A F Hernandez, R Rezaee, G Chung, C Fenga, A B Engin, M Neagu, A L Arsene, A O Docea, E Gofita, D Calina, I Taitzoglou, J Liesivuori, A W Hayes, S Gutnikov, C Tsitsimpikou
In real life, consumers are exposed to complex mixtures of chemicals via food, water and commercial products consumption. Since risk assessment usually focuses on individual compounds, the current regulatory approach doesn't assess the overall risk of chemicals present in a mixture. This study will evaluate the cumulative toxicity of mixtures of different classes of pesticides and mixtures of different classes of pesticides together with food additives (FAs) and common consumer product chemicals using realistic doses after long-term exposure...
June 2017: Human & Experimental Toxicology
https://www.readbyqxmd.com/read/28538825/cochlear-function-in-students-exposed-to-pesticides
#18
Tatiana Rodrigues Garcia, Maria Isabel Kós Pinheiro de Andrade, Silvana Maria Frota, Maria de Fátima Miranda, Raphael Mendonça Guimarães, Armando Meyer
Purpose: To estimate the degree of association between exposure to pesticides and the risk of alteration in cochlear function in students exposed to pesticides. Methods: This study evaluated individuals aged 8 to 30, of both genders, residing in an area of heavy pesticide use in the town of Nova Friburgo, Rio de Janeiro State. Each study participant answered a questionnaire to assess their degree of pesticide exposure. To evaluate cochlear function, audiometry exams were performed, including transient evoked otoacoustic emissions (TEOAEs) and distortion product otoacoustic emissions (DPOAEs)...
May 15, 2017: CoDAS
https://www.readbyqxmd.com/read/28538683/metabolic-investigations-of-the-molecular-mechanisms-associated-with-parkinson-s-disease
#19
REVIEW
Robert Powers, Shulei Lei, Annadurai Anandhan, Darrell D Marshall, Bradley Worley, Ronald L Cerny, Eric D Dodds, Yuting Huang, Mihalis I Panayiotidis, Aglaia Pappa, Rodrigo Franco
Parkinson's disease (PD) is a neurodegenerative disorder characterized by fibrillar cytoplasmic aggregates of α-synuclein (i.e., Lewy bodies) and the associated loss of dopaminergic cells in the substantia nigra. Mutations in genes such as α-synuclein (SNCA) account for only 10% of PD occurrences. Exposure to environmental toxicants including pesticides and metals (e.g., paraquat (PQ) and manganese (Mn)) is also recognized as an important PD risk factor. Thus, aging, genetic alterations, and environmental factors all contribute to the etiology of PD...
May 24, 2017: Metabolites
https://www.readbyqxmd.com/read/28537817/the-action-of-probiotic-microorganisms-on-chemical-contaminants-in-milk
#20
Katia Francine Wochner, Tânia Aparecida Becker-Algeri, Eliane Colla, Eliana Badiale-Furlong, Deisy Alessandra Drunkler
Consumption of milk and its derivatives is an important food habit in the diet of all age groups. However, there has been increasing concern about physical, biological (pathogenic or spoilage microorganisms) and chemical (metals, pesticides and mycotoxins) contaminants in milk and dairy products. Considering the high levels of consumption, it is important that milk and dairy products are free from toxic compounds. Microbial degradation as a strategy for chemical decontamination is an emerging biotechnological approach that is considered a safe and inexpensive practice...
May 24, 2017: Critical Reviews in Microbiology
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