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https://www.readbyqxmd.com/read/29352639/indirect-glyphosate-detection-based-on-ninhydrin-reaction-and-surface-enhanced-raman-scattering-spectroscopy
#1
Meng-Lei Xu, Yu Gao, Yali Li, Xueliang Li, Huanjie Zhang, Xiao Xia Han, Bing Zhao, Liang Su
Glyphosate is one of the most commonly-used and non-selective herbicides in agriculture, which may directly pollute the environment and threaten human health. A simple and effective approach to assessment of its damage to the natural environment is thus quite necessary. However, traditional chromatography-based detection methods usually suffer from complex pretreatment procedures. Herein, we propose a simple and sensitive method for the determination of glyphosate by combining ninhydrin reaction and surface-enhanced Raman scattering (SERS) spectroscopy...
January 5, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29351549/weeds-and-ground-dwelling-predators-response-to-two-different-weed-management-systems-in-glyphosate-tolerant-cotton-a-farm-scale-study
#2
Esteban García-Ruiz, Íñigo Loureiro, Gema P Farinós, Pablo Gómez, Elena Gutiérrez, Francisco Javier Sánchez, María Concepción Escorial, Félix Ortego, María Cristina Chueca, Pedro Castañera
The use of glyphosate, as a post-emergence broad-spectrum herbicide in genetically modified glyphosate-tolerant (GT) cotton, supposes a big change in weed management programs with respect to a conventional regime. Thus, alterations in arable flora and arthropod fauna must be considered when evaluating their potential impacts. A 3-year farm-scale study was conducted in a 2-ha GT cotton crop, in southern Spain, to compare the effects of conventional and glyphosate herbicide regimes on weed abundance and diversity and their consequences for ground-dwelling predators...
2018: PloS One
https://www.readbyqxmd.com/read/29350673/glyphosate-ingestion-causing-multiple-organ-failure-a-near-fatal-case-report
#3
Edoardo Picetti, Michela Generali, Francesca Mensi, Giampaolo Neri, Roberta Damia, Giuseppe Lippi, Gianfranco Cervellin
A 55 years old man self-presented to our Emergency Department (ED) reporting an attempted suicide by cutting the left forearm veins and ingesting approximately 200 mL of an herbicide (Myrtos®, containing 36% of glyphosate as isopropylamine salt). Laboratory tests showed metabolic acidosis. Hydration with normal saline and alkalinization with sodium bicarbonate was started according to suggestion of the poison control center, since an antidote was unavailable. Cardiorespiratory condition gradually worsened, so that non-invasive positive pressure ventilation (NIPPV) was applied and infusion of fluids was established...
January 16, 2018: Acta Bio-medica: Atenei Parmensis
https://www.readbyqxmd.com/read/29350295/ems-induced-mutation-followed-by-quizalofop-screening-increased-lipid-productivity-in-chlorella-sp
#4
Orn-U-Ma Tanadul, Wilawan Noochanong, Patiruj Jirakranwong, Sontichai Chanprame
The objective of this study was to enhance biomass and lipid productivity in Chlorella sp. isolate 6-4 by inducing mutagenesis with two growth inhibitors: the herbicide quizalofop-P-ethyl, a known inhibitor of acetyl-CoA carboxylase (ACCase) activity, and chemical mutagen, ethyl methanesulfonate (EMS), at different concentrations and length of times. The induced-mutagenized microalgae were screened on selective medium containing 10-100 µM quizalofop. The biomass yield, biomass productivity, lipid content, and lipid productivity of mutagenized microalgae were determined...
January 19, 2018: Bioprocess and Biosystems Engineering
https://www.readbyqxmd.com/read/29346080/new-insight-into-the-action-of-tryptanthrins-against-plasmodium-falciparum-pharmacophore-identification-via-a-novel-submolecular-qsar-descriptor
#5
Joel A Olson, Raymond J Terryn, Elizabeth L Stewart, J Clayton Baum, Mark J Novak
A new submolecular quantitative structure activity relationship (QSAR) descriptor was applied toward elucidating the anti-malarial pharmacophore of tryptanthrins, a class of compounds known for their anti-parasitic activities. The new descriptor is based on experimental and computational measurements of the tunneling barriers of individual lobes of the molecular orbitals. Lobe-by-lobe QSAR correlation plots revealed a single lobe of the LUMO to be strongly associated with tryptanthrin's anti-malarial activity...
December 27, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/29343265/rnase-if-treated-quantitative-pcr-for-dsrna-quantitation-of-rnai-trait-in-genetically-modified-crops
#6
Po-Hao Wang, Greg Schulenberg, Shannon Whitlock, Andrew Worden, Ning Zhou, Stephen Novak, Wei Chen
BACKGROUND: RNA interference (RNAi) technology has been widely used to knockdown target genes via post-transcriptional silencing. In plants, RNAi is used as an effective tool with diverse applications being developed such as resistance against insects, fungi, viruses, and metabolism manipulation. To develop genetically modified (GM) RNAi traits for insect control, a transgene is created and composed of an inversely-repeated sequence of the target gene with a spacer region inserted between the repeats...
January 17, 2018: BMC Biotechnology
https://www.readbyqxmd.com/read/29342170/determination-of-2-4-dichlorophenoxyacetic-acid-2-4-d-in-rat-serum-for-pharmacokinetic-studies-with-a-simple-hplc-method
#7
Xiao Chen, Hongling Zhang, Yanjian Wan, Xi Chen, Yuanyuan Li
2,4-Dichlorophenoxyacetic acid (2,4-D) is a chlorophenoxy herbicide used worldwide. We describe a high-performance liquid chromatography (HPLC) method with UV detection for the determination of 2,4-D in female and male rat serum. This allows to observe the change of serum 2,4-D concentration in rats with time and its pharmacokinetics characteristics with a simple, rapid, optimized and validated method. The serum samples are pretreated and introduced into the HPLC system. The analytes are separated in a XDB-C18 column with a mobile phase of acetonitrile (solvent A) and 0...
2018: PloS One
https://www.readbyqxmd.com/read/29342167/effects-of-ammonium-based-ionic-liquids-and-2-4-dichlorophenol-on-the-phospholipid-fatty-acid-composition-of-zebrafish-embryos
#8
Aleksandra Piotrowska, Anna Syguda, Bogdan Wyrwas, Lukasz Chrzanowski, Till Luckenbach, Hermann J Heipieper
Ionic liquids consisting of a combination of herbicidal anions with a quaternary ammonium cation act as efficient herbicides, which are under consideration to be used in the agriculture. In the present study, we used embryos of the zebrafish (Danio rerio) as a model to assess the toxic potential of ammonium-based ionic liquids for aquatic organisms. As we assumed interference of the partially hydrophobic ionic liquid cation with lipids, we investigated the adaptation response in the lipid composition of the zebrafish embryos, triggered by the ionic compound...
2018: PloS One
https://www.readbyqxmd.com/read/29341229/assessing-and-mitigating-simulated-population-level-effects-of-three-herbicides-to-a-threatened-plant-application-of-a-species-specific-population-model-of-boltonia-decurrens
#9
Amelie Schmolke, Richard Brain, Pernille Thorbek, Daniel Perkins, Valery Forbes
Extrapolating from organism-level endpoints, as generated from standard pesticide toxicity tests, to populations is an important step in threatened and endangered species risk assessments. We apply a population model for a threatened herbaceous plant species, Boltonia decurrens, to estimate the potential population-level impacts of 3 herbicides. We combine conservative exposure scenarios with dose-response relationships for growth and survival of standard test species, and apply those in the species-specific model...
January 17, 2018: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29339978/increase-of-somatic-cell-mutations-in-oxidative-damage-sensitive-drosophila
#10
Ryota Koike, Tomoyo Uchiyama, Sakae Arimoto-Kobayashi, Keinosuke Okamoto, Tomoe Negishi
Background: Oxidative damage is an important genotoxic source for almost all organisms. To efficiently detect mutations induced by oxidative damage, we previously developed a urate-null Drosophila strain. Using this Drosophila strain, we showed the mutagenic activity of environmental cigarette smoke (ECS) and the herbicide paraquat, which are known to produce reactive oxygen species (ROS). In the present study, we examined the mutagenic activities of carcinogenic mutagens that are considered to cause mutations by adduct formation, alkylation, or crosslinking of cellular DNA in the oxidative damage-sensitive Drosophila to evaluate how the oxidative damage induced by these mutagens is involved in causing mutations...
2018: Genes and Environment: the Official Journal of the Japanese Environmental Mutagen Society
https://www.readbyqxmd.com/read/29339273/electrolyte-selection-and-microbial-toxicity-for-electrochemical-oxidative-water-treatment-using-a-boron-doped-diamond-anode-to-support-site-specific-contamination-incident-response
#11
Rebecca B Phillips, Ryan R James, Matthew L Magnuson
Intentional and unintentional contamination incidents, such as terrorist attacks, natural disasters, and accidental spills, can result in large volumes of contaminated water. These waters may require pre-treatment before disposal and assurances that treated waters will not adversely impact biological processes at wastewater treatment facilities, or receiving waters. Based on recommendations of an industrial workgroup, this study addresses such concerns by studying electrochemical advanced oxidation process (EAOP) pre-treatment for contaminated waters, using a boron-doped diamond (BDD) anode, prior to discharge to wastewater treatment facilities...
January 6, 2018: Chemosphere
https://www.readbyqxmd.com/read/29338195/mesoporous-silica-thin-films-for-improved-electrochemical-detection-of-paraquat
#12
Tauqir Nasir, Gregoire Herzog, Marc Hebrant, Christelle Despas, Liang Liu, Alain Walcarius
An electrochemical method was developed for rapid and sensitive detection of the herbicide paraquat in aqueous samples using mesoporous silica thin film modified glassy carbon electrodes (GCE). Vertically-aligned mesoporous silica thin films were deposited onto GCE by electrochemically assisted self-assembly (EASA). Cyclic voltammetry revealed effective response to the cationic analyte (while rejecting anions) thanks to the charge selectivity exhibited by the negatively-charged mesoporous channels. Square wave voltametry (SWV) was then used to detect paraquat via its one electron reduction process...
January 17, 2018: ACS Sensors
https://www.readbyqxmd.com/read/29337923/synergistic-antifungal-allelopatic-and-anti-proliferative-potential-of-salvia-officinalis-l-and-thymus-vulgaris-l-essential-oils
#13
Ersilia Alexa, Renata Maria Sumalan, Corina Danciu, Diana Obistioiu, Monica Negrea, Mariana-Atena Poiana, Cristian Rus, Isidora Radulov, Georgeta Pop, Cristina Dehelean
The current study aimed to investigate the chemical composition and the synergistic potential of two essential oils (EOs), as obtained from Salvia officinalis L. (SEO), and Thymus vulgaris L. (TEO). The antifungal potential was tested in vitro against Fusarium graminearum (Fg 06_17), the herbicidal effect was studied using weed seeds of Amaranthus retroflexus (ARET), Chenopodium album (CALB), Echinochloa crus-galli (EGAL), but also wheat seeds (WS) of the Lovrin variety and tomato seeds Saint-Pierre of the variety...
January 16, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29337681/dissipation-dynamics-of-terbuthylazine-in-soil-during-the-maize-growing-season
#14
Sanja Stipičević, Gordana Mendaš, Marija Dvoršćak, Sanja Fingler, Natalija Galzina, Klara Barić
Ever since terbuthylazine (TBA) replaced atrazine in herbicide crop treatment, its much greater persistence has raised considerable environmental concern. The aim of our field experiment was to establish the dissipation dynamics of TBA and its degradation product desethylterbuthylazine (DET) in soil over five months of maize growth. We applied TBA as part of pre-emergent treatment in the regular and double-the-regular amounts. Soil samples were collected periodically at the following depths: 0-10 cm, 10-20 cm, 20-30 cm, and 30-50 cm...
December 20, 2017: Arhiv za Higijenu Rada i Toksikologiju
https://www.readbyqxmd.com/read/29337421/fenoxaprop-p-ethyl-resistance-conferred-by-cytochrome-p450s-and-target-site-mutation-in-alopecurus-japonicus
#15
Guoqi Chen, Hongle Xu, Teng Zhang, Congqiang Bai, Liyao Dong
BACKGROUND: Alopecurus japonicus has evolved serious resistance to acetyl-CoA carboxylase (ACCase) inhibiting herbicides. Although target-site resistance (TSR) to ACCase inhibitors in A. japonicus has been reported, but non-target site resistance (NTSR) has not. This study investigated both TSR and NTSR in a fenoxaprop-P-ethyl-resistant A. japonicus population (AHFD-3), which was collected in Feidong County, Anhui Province, China. RESULTS: We found that AHFD-3 exhibited high resistance to fenoxaprop-P-ethyl and low resistance to flucarbazone-sodium...
January 16, 2018: Pest Management Science
https://www.readbyqxmd.com/read/29336683/adsorption-of-2-4-dichlorophenoxyacetic-acid-and-4-chloro-2-metylphenoxyacetic-acid-onto-activated-carbons-derived-from-various-lignocellulosic-materials
#16
Beata Doczekalska, Krzysztof Kuśmierek, Andrzej Świątkowski, Monika Bartkowiak
Adsorption of 2,4-dichlorophenoxyacetic acid (2,4-D) and 4-chloro-2-metylphenoxyacetic acid (MCPA) from aqueous solution onto activated carbons derived from various lignocellulosic materials including willow, miscanthus, flax, and hemp shives was investigated. The adsorption kinetic data were analyzed using two kinetic models: the pseudo-first order and pseudo-second order equations. The adsorption kinetics of both herbicides was better represented by the pseudo-second order model. The adsorption isotherms of 2,4-D and MCPA on the activated carbons were analyzed using the Freundlich and Langmuir isotherm models...
January 16, 2018: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/29334902/expression-characterization-of-the-herbicide-tolerance-gene-aryloxyalkanoate-dioxygenase-aad-1-controlled-by-seven-combinations-of-regulatory-elements
#17
Delkin O Gonzalez, Jeff B Church, Andrew Robinson, James P Connell, Megan Sopko, Boyd Rowland, Kristina Woodall, Cory M Larsen, John P Davies
BACKGROUND: Availability of well characterized maize regulatory elements for gene expression in a variety of tissues and developmental stages provides effective alternatives for single and multigene transgenic concepts. We studied the expression of the herbicide tolerance gene aryloxyalkanoate dioxygenase (aad-1) driven by seven different regulatory element construct designs including the ubiquitin promoters of maize and rice, the actin promoters of melon and rice, three different versions of the Sugarcane Bacilliform Badnavirus promoters in association with other regulatory elements of gene expression...
January 15, 2018: BMC Plant Biology
https://www.readbyqxmd.com/read/29332279/ecotoxicity-thresholds-for-ametryn-diuron-hexazinone-and-simazine-in-fresh-and-marine-waters
#18
Michael St J Warne, Olivia King, Rachael A Smith
Triazine and urea herbicides are two groups of photosystem II inhibiting herbicides frequently detected in surface, ground and marine waters. Yet, there are few water quality guidelines for herbicides. Ecotoxicity thresholds (ETs) for ametryn, hexazinone and simazine (triazine herbicides) and diuron (a urea herbicide) were calculated using the Australian and New Zealand method for deriving guideline values to protect fresh and marine ecosystems. Four ETs were derived for each chemical and ecosystem that should theoretically protect 99, 95, 90 and 80% of species (i...
January 14, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29332141/cultivable-fungi-present-in-antarctic-soils-taxonomy-phylogeny-diversity-and-bioprospecting-of-antiparasitic-and-herbicidal-metabolites
#19
Eldon C Q Gomes, Valéria M Godinho, Débora A S Silva, Maria T R de Paula, Gislaine A Vitoreli, Carlos L Zani, Tânia M A Alves, Policarpo A S Junior, Silvane M F Murta, Emerson C Barbosa, Jaquelline G Oliveira, Fabio S Oliveira, Camila R Carvalho, Mariana C Ferreira, Carlos A Rosa, Luiz H Rosa
Molecular biology techniques were used to identify 218 fungi from soil samples collected from four islands of Antarctica. These consisted of 22 taxa of 15 different genera belonging to the Zygomycota, Ascomycota, and Basidiomycota. Mortierella, Antarctomyces, Pseudogymnoascus, and Penicillium were the most frequently isolated genera and Penicillium tardochrysogenum, Penicillium verrucosus, Goffeauzyma gilvescens, and Mortierella sp. 2 the most abundant taxa. All fungal isolates were cultivated using solid-state fermentation to obtain their crude extracts...
January 13, 2018: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/29330913/the-mechanism-of-diflufenican-resistance-and-its-inheritance-in-oriental-mustard-sisymbrium-orientale-l-from-australia
#20
Hue Thi Dang, Jenna Moira Malone, Peter Boutsalis, Gurjeet Gill, Christopher Preston
BACKGROUND: An oriental mustard population (P3) collected near Quambatook, Victoria was identified resistant to diflufenican by screening with the field rate (200 g a.i. ha-1 ) of the herbicide. The mechanism (s) of diflufenican resistance and its inheritance in this population was therefore investigated. RESULTS: Dose-response experiment confirmed population P3 was 140-fold more resistant to diflufenican as determined by the comparison of LD50 values with the susceptible populations...
January 13, 2018: Pest Management Science
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