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https://www.readbyqxmd.com/read/29346076/ultrasensitive-electrochemical-immuno-sensing-platform-based-on-gold-nanoparticles-triggering-chlorpyrifos-detection-in-fruits-and-vegetables
#1
Anita Talan, Annu Mishra, Sergei A Eremin, Jagriti Narang, Ashok Kumar, Sonu Gandhi
Chlorpyrifos (chl) is an organophosphate pesticide extensively used in agriculture and highly toxic for human health. Fluorine doped tin-oxide (FTO) based electrochemical nanosensor was developed for chlorpyrifos detection with gold nanoparticles (AuNPs) and anti-chlorpyrifos antibodies (chl-Ab). AuNPs provides high electrical conductivity and specific resistivity, thus increases the sensitivity of immunoassay. High electrical conductivity of AuNPs reveals that it promotes the redox reaction for better cyclic voltammetry...
January 9, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29330915/effects-of-seed-mixture-sowing-with-resistant-and-susceptible-rice-on-population-dynamics-of-target-planthoppers-and-non-target-stemborers-and-leaffolders
#2
Zhuo Li, Gui-Jun Wan, Long Wang, Megha N Parajulee, Zi-Hua Zhao, Fa-Jun Chen
BACKGROUND: The widespread planting of insect-resistant crops has caused a dramatic shift in agricultural landscapes, thus raising concerns about the potential impact on both target and non-target pests worldwide. In this study, we examined the potential effects of six seed-mixture ratios of insect-resistant dominance (100%-R100, 95%-S05R95, 90%-S10R90, 80%-S20R80, 60%-S40R60, and 0%-S100) on target and non-target pests in a 2-year field trial in southern China. RESULTS: The occurrence of target pests, Nilaparvata lugens and Sogatella furcifera, decreased with the increased ratio of resistant rice, and the mixture ratios with ≥90% resistant rice significantly increased the pest suppression efficiency, with lowest occurrences of non-target pests, Sesamia inferens, Chilo suppressalis and Cnaphalocrocis medinalis, in S100 and S10R90 seed-mixture ratios...
January 13, 2018: Pest Management Science
https://www.readbyqxmd.com/read/29324824/assessing-the-links-among-environmental-contaminants-endocrinology-and-parasites-to-understand-amphibian-declines-in-montane-regions-of-costa-rica
#3
Christopher J Leary, Hannah F Ralicki, David Laurencio, Sarah Crocker-Buta, John H Malone
Amphibians inhabiting montane riparian zones in the Neotropics are particularly vulnerable to decline, but the reasons are poorly understood. Because environmental contaminants, endocrine disruption, and pathogens often figure prominently in amphibian declines it is imperative that we understand how these factors are potentially interrelated to affect montane populations. One possibility is that increased precipitation associated with global warming promotes the deposition of contaminants in montane regions...
2018: PloS One
https://www.readbyqxmd.com/read/29300936/novel-environmental-class-1-integrons-and-cassette-arrays-recovered-from-an-on-farm-bio-purification-plant
#4
María Carla Martini, María Paula Quiroga, Mariano Pistorio, Antonio Lagares, Daniela Centrón, María Florencia Del Papa
Rapid dissemination and emergence of novel antibiotic resistance genes among bacteria are rising problems worldwide. Since their discovery in clinical isolates in the late 1980s, class 1 integrons have been found in a wide range of bacterial genera and have been extensively studied as contributors to dissemination of antibiotic resistance.The present study aimed to investigate the presence and structure of class 1 integrons in plasmid-carrying bacterial isolates obtained from a biopurification system used for decontamination of pesticide-contaminated water as well as their possible role as reservoir of antimicrobial-resistance gene cassettes...
December 27, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/29281043/density-dependence-and-growth-rate-evolutionary-effects-on-resistance-development-to-bt-bacillus-thuringiensis
#5
Jeannette C Martinez, Michael A Caprio, Nicholas A Friedenberg
It has long been recognized that pest population dynamics can affect the durability of a pesticide, but dose remains the primary component of insect resistance management (IRM). For transgenic pesticidal traits such as Bt (Bacillus thuringiensis Berliner (Bacillales: Bacillaceae)), dose (measured as the mortality of susceptibles caused by a toxin) is a relatively fixed characteristic and often falls below the standard definition of high dose. Hence, it is important to understand how pest population dynamics modify durability and what targets they present for IRM...
December 21, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/29241121/nanotitania-crystals-induced-efficient-photocatalytic-color-degradation-antimicrobial-and-larvicidal-activity
#6
Jinu Udayabhanu, Vaitheeswari Kannan, Manish Tiwari, Geetha Natesan, Benelli Giovanni, Venkatachalam Perumal
Textile industries release tonnes of harmful toxic dyes into the environment, causing severe effects on living organisms, including humans. Mosquitoes vectors spread important diseases which cause millions of human deaths worldwide. To control mosquitoes a number of synthetic mosquitocidal agents have been employed but all these pesticides pose harmful effects to human health and non-target species and also led to resistance development in treated vectors. Microbial strains are also developing resistance to the available antibiotics, this currently represents a major public health challenge...
December 6, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29240994/using-mutations-for-pesticide-resistance-to-identify-the-cause-of-toxicity-in-environmental-samples
#7
Donald P Weston, Helen C Poynton, Kaley M Major, Gary A Wellborn, Michael J Lydy, Christoph Moschet, Richard E Connon
Traditional Toxicity Identification Evaluations (TIE) are applied to identify causal agents in complex environmental samples showing toxicity and rely upon physical or chemical manipulation of samples. However, mutations conferring toxicant resistance provide the opportunity for a novel biologically based TIE. Populations within the Hyalella azteca complex from pesticide-affected waterways were 2 and 3 orders of magnitude more resistant to the pyrethroid cyfluthrin and the organophosphate chlorpyrifos, respectively, than laboratory-cultured H...
January 16, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29239610/nano-sensing-of-pesticides-by-zinc-oxide-quantum-dot-an-optical-and-electrochemical-approach-for-the-detection-of-pesticides-in-water
#8
Dibakar Sahoo, Abhishek Mandal, Tapas Mitra, Kaushik Chakraborty, Munmun Bardhan, Anjan Kumar Dasgupta
Present study reveals the low concentrations (~ 4 ppm) of pesticide sensing vis-à-vis degradation of pesticides with the help of nontoxic zinc oxide quantum dots (QD). In our study, we have taken 4 different pesticides v.i.z., Aldrin, Tetradifon, Glyphosate, and Atrazine, which are widely used in agriculture and have structural dissimilarities/diversity. By using optical sensing techniques such as steady state and time resolved fluorescence we have analysed the detailed exciton dynamics of QD in the presence of different pesticides...
December 14, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29223450/pesticide-degrading-natural-multidrug-resistance-bacterial-flora
#9
REVIEW
Kirubakaran Rangasamy, Murugan Athiappan, Natarajan Devarajan, Gopinath Samykannu, Javid A Parray, K N Aruljothi, Nowsheen Shameem, Abdulaziz A Alqarawi, Abeer Hashem, Elsayed Fathi Abd Allah
Multidrug-resistant (MDR) bacteria are a growing threat to humans across the world. Antibiotic resistance is a global problem that has developed through continuous antibiotic use, combinatorial antibiotic use, pesticide-antibiotic cross-resistance, and horizontal gene transfer, as well as various other modes. Pesticide-antibiotic cross-resistance and the subsequent expansion of drug-resistant bacteria are critically documented in this review, the primary focus of which is to assess the impact of indiscriminate pesticide use on the development of microbial communities with parallel pesticide and multidrug resistance...
December 6, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29205815/advocating-a-need-for-suitable-breeding-approaches-to-boost-integrated-pest-management-a-european-perspective
#10
Jay Ram Lamichhane, Edward Arseniuk, Piet Boonekamp, Jerzy Czembor, Veronique Decroocq, Jérome Enjalbert, Maria R Finckh, Małgorzata Korbin, Mati Koppel, Per Kudsk, Akos Mesterhazy, Danuta Sosnowska, Ewa Zimnoch-Guzowska, Antoine Messéan
Currently, European farmers do not have access to a sufficient number and diversity of crop species/varieties. This prevents them from designing more resilient cropping systems to abiotic and biotic stresses. Crop diversification is a key lever to reduce pest (pathogens, animal pests and weeds) pressures at all spatial levels from fields to landscapes. In this context, plant breeding should consist of: i) increased efforts in the development of new or minor crop varieties to foster diversity of cropping systems, and ii) focus on more resilient varieties showing local adaptation...
December 4, 2017: Pest Management Science
https://www.readbyqxmd.com/read/29205390/sustaining-global-agriculture-through-rapid-detection-and-deployment-of-genetic-resistance-to-deadly-crop-diseases
#11
REVIEW
Sambasivam Periyannan
Contents I. II. III. IV. V. VI. VII. VIII. References SUMMARY: Genetically encoded resistance is a major component of crop disease management. Historically, gene loci conferring resistance to pathogens have been identified through classical genetic methods. In recent years, accelerated gene cloning strategies have become available through advances in sequencing, gene capture and strategies for reducing genome complexity. Here, I describe these approaches with key emphasis on the isolation of resistance genes to the cereal crop diseases that are an ongoing threat to global food security...
December 4, 2017: New Phytologist
https://www.readbyqxmd.com/read/29196232/integration-of-microbial-biopesticides-in-greenhouse-floriculture-the-canadian-experience
#12
REVIEW
Michael Brownbridge, Rose Buitenhuis
Historically, greenhouse floriculture has relied on synthetic insecticides to meet its pest control needs. But, growers are increasingly faced with the loss or failure of synthetic chemical pesticides, declining access to new chemistries, stricter environmental/health and safety regulations, and the need to produce plants in a manner that meets the 'sustainability' demands of a consumer driven market. In Canada, reports of thrips resistance to spinosad (Success™) within 6-12 months of its registration prompted a radical change in pest management philosophy and approach...
November 28, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/29194942/rnai-technology-in-crop-protection-against-arthropod-pests-pathogens-and-nematodes
#13
REVIEW
Moises Zotti, Ericmar Avila Dos Santos, Deise Cagliari, Olivier Christiaens, Clauvis Nji Tizi Taning, Guy Smagghe
Scientists have made significant progress to understand and unravel several aspects of dsRNA-mediated gene silencing during the last two decades. Now that the RNAi mechanism is well understood, it is time to point out some directions on how to transfer the acquired knowledge into useful applications for agriculture and crop protection. Some RNAi-based products are already available for farmers and more are expected to reach the market soon. The tailor-made dsRNA as an active ingredient for biopesticide formulations is considered a raw material that can be directed to diverse purposes, from pest control and bee protection against viruses to pesticide resistance management...
November 30, 2017: Pest Management Science
https://www.readbyqxmd.com/read/29193239/calibration-of-silicone-rubber-rods-as-passive-samplers-for-pesticides-at-two-different-flow-velocities-modelling-of-sampling-rates-under-water-boundary-layer-and-polymer-control
#14
Alexis Martin, Christelle Margoum, Antoine Jolivet, Azziz Assoumani, Bachir El Moujahid, Jerome Randon, Marina Coquery
There is a need to determine time-weighted average concentrations of polar contaminants such as pesticides by passive sampling in environmental waters. Calibration data for silicone rubber (SR)-based passive samplers are lacking for this class of compounds. The calibration data, sampling rate (Rs ) and partition coefficient between SR and water (Ksw ) were precisely determined for 23 pesticides and 13 candidate performance reference compounds (PRCs) in a laboratory calibration system over 14 d for two water flow velocities, 5 cm s-1 and 20 cm s-1 ...
November 28, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29190597/insecticidal-activity-of-camphene-zerumbone-and-%C3%AE-humulene-from-cheilocostus-speciosus-rhizome-essential-oil-against-the-old-world-bollworm-helicoverpa-armigera
#15
Giovanni Benelli, Marimuthu Govindarajan, Mohan Rajeswary, Baskaralingam Vaseeharan, Sami A Alyahya, Naiyf S Alharbi, Shine Kadaikunnan, Jamal M Khaled, Filippo Maggi
The fast-growing resistance development to several synthetic and microbial insecticides currently marketed highlighted the pressing need to develop novel and eco-friendly pesticides. Among the latter, botanical ones are attracting high research interest due to their multiple mechanisms of action and reduced toxicity on non-target vertebrates. Helicoverpa armigera (Lepidoptera: Noctuidae) is a key polyphagous insect pest showing insecticide resistance to several synthetic molecules used for its control. Therefore, here we focused on the rhizome essential oil extracted from an overlooked Asian plant species, Cheilocostus speciosus (J...
November 27, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29175757/identification-and-characterization-of-chemosensory-gene-families-in-the-bark-beetle-tomicus-yunnanensis
#16
Nai-Yong Liu, Zong-Bo Li, Ning Zhao, Qi-Sheng Song, Jia-Ying Zhu, Bin Yang
The bark beetle, Tomicus yunnanensis (Coleoptera: Scolytinae), is a seriously destructive pest of Yunnan pine (Pinus yunnanensis) and is distributed solely in Southwestern China. It has been a challenge to control this pest owing to its resistance to chemical pesticides, which have been used as the main control strategy of this species in recent years. Since this approach will continue until an alternative mitigation strategy is implemented, it is essential to develop novel or improved biocontrol approaches...
November 23, 2017: Comparative Biochemistry and Physiology. Part D, Genomics & Proteomics
https://www.readbyqxmd.com/read/29175578/exposure-to-permethrin-promotes-high-fat-diet-induced-weight-gain-and-insulin-resistance-in-male-c57bl-6j-mice
#17
Xiao Xiao, Quancai Sun, Yoo Kim, Szu-Hao Yang, Weipeng Qi, Daeyoung Kim, Kyong Sup Yoon, John M Clark, Yeonhwa Park
Permethrin is a pyrethroid pesticide that was previously reported to promote fat accumulation and insulin resistance in vitro. A recent study in female mice also found that permethrin could promote high fat-induced insulin resistance. The effects of permethrin on glucose and lipid metabolisms in male mice, however, remain unknown. The purpose of this study was to investigate the effects and interactions of permethrin exposure (50, 500, and 5000 μg/kg body weight/day) and dietary fat (low fat, 4% w/w; high fat, 20% w/w) on development of obesity and insulin resistance in male C57BL/6J mice...
November 23, 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29170435/biofunctional-analysis-of-vitellogenin-and-vitellogenin-receptor-in-citrus-red-mites-panonychus-citri-by-rna-interference
#18
Muhammad Waqar Ali, Zhen-Yu Zhang, Shuang Xia, Hongyu Zhang
Panonychus citri is one of the most damaging pests of horticultural crops. Conventional control of this pest population through pesticides has led to the enhanced pest resistance. Management of P. citri population through RNAi, is still largely unknown. In oviparous organisms, fabrication and development of yolk protein play a vital role in the reproduction. Vitellin (Vn) is the source of eggs storage that helps in proper functioning of Vitellogenin (Vg) and Vitellogenin receptor (VgR). VgR is very compulsory protein for the development of Vg into oocytes...
November 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29165339/chemical-compounds-and-bioactivity-of-aqueous-extracts-of-alibertia-spp-in-the-control-of-plutella-xylostella-l-lepidoptera-plutellidae
#19
Lucas L S Peres, Ana I Sobreiro, Irys F S Couto, Rosicléia M Silva, Fabricio F Pereira, Silvia C Heredia-Vieira, Claudia A L Cardoso, Munir Mauad, Silvana P Q Scalon, Sandra S Verza, Rosilda M Mussury
Successive applications of insecticides to control Plutella xylostella L. (Lepidoptera: Plutellidae) have resulted in the emergence of resistant populations of this insect. A novel control measure for this target insect could be the use of botanical insecticides derived from plant tissues. Hence, we experimentally tested aqueous extracts of Alibertia edulis (Rich.), Alibertia intermedia (Mart.), and Alibertia sessilis (Vell.) K. Schum. found in the Brazilian savannah in order to investigate their potential to disrupt the life cycle of P...
November 22, 2017: Insects
https://www.readbyqxmd.com/read/29163375/isolation-and-characterization-of-pseudomonas-spp-strains-that-efficiently-decompose-sodium-dodecyl-sulfate
#20
Ewa M Furmanczyk, Michal A Kaminski, Grzegorz Spolnik, Maciej Sojka, Witold Danikiewicz, Andrzej Dziembowski, Leszek Lipinski, Adam Sobczak
Due to their particular properties, detergents are widely used in household cleaning products, cosmetics, pharmaceuticals, and in agriculture as adjuvants tailoring the features of pesticides or other crop protection agents. The continuously growing use of these various products means that water soluble detergents have become one of the most problematic groups of pollutants for the aquatic and terrestrial environments. Thus it is important to identify bacteria having the ability to survive in the presence of large quantities of detergent and efficiently decompose it to non-surface active compounds...
2017: Frontiers in Microbiology
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