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https://www.readbyqxmd.com/read/30341931/n-n-dioxide-metal-complexes-mediated-enantioselective-2-2-photocycloadditions-of-enones-and-olefins-with-visible-light
#1
Han Yu, Shunxi Dong, Qian Yao, Long Chen, Dong Zhang, Xiaohua Liu, Xiaoming Feng
2-Alkenoyl pyridine-bound N,N'-dioxide/TbIII complex was found to be able to absorb visible light to reach its excited state, leading to direct visible-light-excited catalytic enantioselective [2+2] cycloaddition of 2-alkenoyl pyridines with various alkenes in the absence of additional photosensitizer. Diverse enantioenriched cyclobutanes were obtained in good results (up to 70% yields, >19:1 d.r., 92% ee). The new chiral terbium(III) complex features bathochromic shift, lower excitation energy, and facile intersystem crossing due to the paramagnetic and heavy-atom effects, enabling the antenna 2-alkenoyl pyridines to be excited...
October 20, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/30341753/effects-of-road-proximity-on-heavy-metal-concentrations-in-soils-and-common-roadside-plants-in-southern-california
#2
Noreen Khalid, Mumtaz Hussain, Hillary S Young, Benjamin Boyce, Muhammad Aqeel, Ali Noman
Concerns about motor vehicle emissions on human health are typically focused on aerial pollution and are regulated via controls on tailpipe emissions. However, vehicles also contribute heavy metal emissions through non-tailpipe pathways (e.g., brake wear, tire particulates). The metal pollutants produced via both tailpipe and non-tailpipe pathways pose threats to both human and ecosystem health long after they have settled from the atmosphere largely via contamination of soils and plants. In this study, we examined the effect of vehicular pollution on soils and plants in five paired sites in Gaviota, CA...
October 19, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/30341749/effects-of-compost-application-on-soil-vulnerability-to-heavy-metal-pollution
#3
Vasiliy Rosen, Yona Chen
Soil vulnerability to heavy metal pollution is low in soils exhibiting an ability to strongly adsorb heavy metals on their geochemical fractions. Organic matter (OM) is among other components of soils, one of the most effective sorbing fractions. Compost addition is often used for soil remediation thereby enriching the soil with OM. However, compost is often enriched with heavy metals and thereby may induce adverse effects on the soil and plants growing in them. Compost-derived dissolved organic matter (DOM) can mobilize heavy metals...
October 19, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/30341564/behavior-of-the-extremophile-green-alga-coccomyxa-melkonianii-scca-048-in-terms-of-lipids-production-and-morphology-at-different-ph-values
#4
Santina Soru, Veronica Malavasi, Pierluigi Caboni, Alessandro Concas, Giacomo Cao
The extremophile green alga Coccomyxa melkonianii SCCA 048 was investigated to evaluate its ability to grow in culture media with different pH. Specifically, Coccomyxa melkonianii was sampled in the Rio Irvi river (Sardinia, Italy) which is severely polluted by heavy metals as a result of abandoned mining activities. In this study, the strain was cultivated in growth media where the pH was kept fixed at the values of 4.0, 6.8 and 8.0, respectively. During the investigation, a significant phenotypic plasticity of this strain was observed...
October 19, 2018: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/30341085/shared-genomic-regions-underlie-natural-variation-in-diverse-toxin-responses
#5
Kathryn S Evans, Shannon C Brady, Joshua S Bloom, Robyn E Tanny, Daniel E Cook, Sarah E Giuliani, Stephen W Hippleheuser, Mostafa Zamanian, Erik C Andersen
Phenotypic complexity is caused by the contributions of environmental factors and multiple genetic loci, interacting or acting independently. Studies of yeast and Arabidopsis often find that the majority of natural variation across phenotypes is attributable to independent additive quantitative trait loci (QTL). Detected loci in these organisms explain most of the estimated heritable variation. By contrast, many heritable components underlying phenotypic variation in metazoan models remain undetected. Before the relative impacts of additive and interactive variance components on metazoan phenotypic variation can be dissected, high replication and precise phenotypic measurements are required to obtain sufficient statistical power to detect loci contributing to this missing heritability...
October 19, 2018: Genetics
https://www.readbyqxmd.com/read/30340677/variations-in-concentrations-and-bioavailability-of-heavy-metals-in-rivers-caused-by-water-conservancy-projects-insights-from-water-regulation-of-the-xiaolangdi-reservoir-in-the-yellow-river
#6
Jianwei Dong, Xinghui Xia, Zhining Zhang, Zixuan Liu, Xiaotian Zhang, Husheng Li
Water regulation of the Xiaolangdi Reservoir of the Yellow River was chosen as a case to investigate variations in concentrations and bioavailability of heavy metals caused by water conservancy projects in rivers. Water and suspended sediment (SPS) samples were collected at downstream sampling sites along the river during this period. Concentrations and speciation of Zn, Cr, Cu, Ni, and Pb in water and SPS samples were analyzed, and their bioaccumulation was studied with Daphnia magna. This study indicated that the exchangeable and carbonate-bound fractions of heavy metals in SPS decreased along the studied stretch, and the dissolved heavy metal concentrations increased along the river with 1...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340666/effects-of-surfactants-on-the-combined-toxicity-of-tio-2-nanoparticles-and-cadmium-to-escherichia-coli
#7
Mei Li, Jianchuan Pei, Xiaomeng Tang, Xiaoli Guo
The combined ecological toxicity of TiO2 nanoparticles (nano-TiO2 ) and heavy metals has been paid more attention. As the common pollutants in water environment, surfactants could affect the properties of nanoparticles and heavy metals, and thus further influence the combined toxicity of nano-TiO2 and heavy metals. In this study, the effects of sodium dodecyl benzene sulfonate (SDBS) and Tween 80 on the single and combined toxicities of Cd2+ and nano-TiO2 to Escherichia coli (E. coli) were examined, and the underlying influence mechanism was further discussed...
December 2018: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/30340417/-cupriavidus-metallidurans-strains-with-different-mobilomes-and-from-distinct-environments-have-comparable-phenomes
#8
Rob Van Houdt, Ann Provoost, Ado Van Assche, Natalie Leys, Bart Lievens, Kristel Mijnendonckx, Pieter Monsieurs
Cupriavidus metallidurans has been mostly studied because of its resistance to numerous heavy metals and is increasingly being recovered from other environments not typified by metal contamination. They host a large and diverse mobile gene pool, next to their native megaplasmids. Here, we used comparative genomics and global metabolic comparison to assess the impact of the mobilome on growth capabilities, nutrient utilization, and sensitivity to chemicals of type strain CH34 and three isolates (NA1, NA4 and H1130)...
October 18, 2018: Genes
https://www.readbyqxmd.com/read/30340357/pollution-level-and-health-risk-assessment-of-pm-2-5-bound-metals-in-baoding-city-before-and-after-the-heating-period
#9
Yixuan Liu, Shanshan Li, Chunyuan Sun, Mengxi Qi, Xue Yu, Wenji Zhao, Xiaoxiu Li
In order to assess the pollution levels and health risks of PM2.5 -bound metals in Baoding City before and after the heating period, samples were collected in 2016 at Hebei University from September 25th to November 14th during the non-heating period, and November 15th to December 26th during the heating period, respectively. ICP-MS was applied to analyze seven heavy metals (Cr, Zn, Cu, Pb, Ni, Cd and Fe). The statistical analysis, enrichment factor (EF), pollution load index method, and Risk Assessment Method proposed by U...
October 18, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/30340278/assessment-of-the-toxic-potential-of-rainwater-precipitation-first-evidence-from-a-case-study-in-three-greek-cities
#10
Dimitris Vlastos, Maria Antonopoulou, Alexia Lavranou, Ioanna Efthimiou, Stefanos Dailianis, Dimitra Hela, Dimitra Lambropoulou, Anastasia K Paschalidou, Pavlos Kassomenos
Considering the necessity to monitor rainwater quality and the limited existing data regarding wet precipitations' toxic potential, the toxic potential of rainwater (RW) samples collected in three cities of Western Greece (Corfu, Agrinion and Patras) during May, October, November, and December of 2014 were investigated. The relationship of the adverse effects obtained, against cytokinesis block micronucleus (CBMN) and Vibrio fischeri bioluminescence (Microtox) assays with the physicochemical characteristics, the heavy metal concentration levels of rainwater samples and the meteorological parameters governing the climatic conditions in each region, were studied in detail...
January 15, 2019: Science of the Total Environment
https://www.readbyqxmd.com/read/30340265/bioadsorptive-removal-of-pb-ii-from-aqueous-solution-by-the-biorefinery-waste-of-fucus-spiralis
#11
Catalina Filote, Irina Volf, Sílvia C R Santos, Cidália M S Botelho
In the context of developing the circular economy that enables a more sustainable use of the available resources and minimum waste generation, marine macroalgae have attracted the attention of researchers and industry due to its potential as a renewable resource. The current work aims to contribute to the design of a complete biorefinery processing, using Fucus spiralis seaweed (brown division) as starting material, and to determine the potential of the derived waste as biosorbent of heavy metals in aqueous solution...
January 15, 2019: Science of the Total Environment
https://www.readbyqxmd.com/read/30340204/turn-on-fluorescent-detection-for-cd-2-based-on-surfactant-controlled-squaraine-aggregation
#12
Xiaoqian Liu, Na Li, Min-Min Xu, Chunhui Jiang, Jianhao Wang, Guoqiang Song, Yong Wang
A thymine moiety as ion binding accepter was introduced into asymmetric squaraine fluorophore by amide coupling reaction to develop a new thymine-squaraine based fluorescent chemosensor (SQ). Its detection ability towards heavy metal ions was investigated by UV-vis and fluorescent spectrometry. The results showed that the sensor had high selectivity towards Cd2+ over the other metal ions in aqueous media. Moreover, it was shown that the turn on fluorescence signal occurred in the present of high concentration of cationic surfactant hexadecyl trimethyl ammonium bromide (CTAB) solution which resulting in deaggregations of SQ...
October 12, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/30340177/effect-of-arsenate-on-endogenous-levels-of-cytokinins-with-different-existing-forms-in-two-pteris-species
#13
Qinchun Li, Hongbin Wang, Haijuan Wang, Yang Li, Zhongzhen Wang, Xuemei Zhang
Our previous results showed that content of trans-zeatin (tZ) increases in leaves of heavy metal hyperaccumulators but decreases in non-hyperaccumulators growing in multiple heavy metal polluted soils. However, the relationship between arsenic (As) accumulation and endogenous forms of cytokinins (CTKs) in As hyperaccumulators remains unknown. Here a hydroponic experiment was conducted to compare the CTK forms in the As hyperaccumulator Pteris cretica var. nervosa and non-hyperaccumulator Pteris ensiformis under arsenate stress (0, 2, 5, and 10 mg L-1 )...
October 10, 2018: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/30340005/chitosan%C3%A2-g%C3%A2-maleic-acid-for-effective-removal-of-copper-and-nickel-ions-from-their-solutions
#14
Ahmed G Ibrahim, Alaaeldine Sh Saleh, Emad M Elsharma, Essam Metwally, Tharwat Siyam
Pollution of the environment associated with discharging the toxic heavy metals in water makes us focus the light to solve this problem. In continuation of our efforts, we aim in this work to utilize the graft copolymer (chitosan‑g‑maleic acid) to purify water from copper and nickel ions. The graft copolymer has been synthesized using gamma radiation and the grafting conditions have been optimized by studying the influence of acetic acid concentration (0.5-10% V/V), monomer concentration (5-17.5% w/v), chitosan concentration (0...
October 16, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/30339717/protective-effect-of-lycopene-against-chemical-and-natural-toxins-a-review
#15
REVIEW
Narges Hedayati, Mehri Bemani Naeini, Alireza Nezami, Hossein Hosseinzadeh, A Wallace Hayes, Sarasadat Hosseini, Mohsen Imenshahidi, Gholamreza Karimi
People are exposed to a number of environmental, occupational, and therapeutic toxic agents which may be natural or man made. These hazardous substances may manifest as direct side effects on the function of organs or indirectly induced alteration of gene expression, cancer-associated metabolic pathways, and/or alter homeostasis. Lycopene, as a one of the most potent antioxidant, is found in fruits and vegetables. High-intake of lycopene has been shown to be effective in decreasing the risk of both natural toxins including mycotoxins, bacterial toxins, and chemical toxins including heavy metals, pesticides as well as herbicides...
October 19, 2018: BioFactors
https://www.readbyqxmd.com/read/30338985/graphene-aerogel-metal-organic-framework-based-electrochemical-method-for-simultaneous-detection-of-multiple-heavy-metal-ions
#16
Muxin Lu, Yajuan Deng, Yi Luo, Junping Lv, Tianbao Li, Juan Xu, Shu-Wei Chen, Jinyi Wang
The development of an effective method for detecting heavy metal ions remains a serious task due to their high toxicity to public health and environments. Herein, a new electrochemical method based on a graphene aerogel (GA) and metal-organic framework (MOF) composites was developed for simultaneous detection of multiple heavy metal ions in aqueous solutions. The GA-MOF composites were synthesized via the in situ growth of the MOF UiO-66-NH2 crystal on the GA matrix. GA not only serves as the backbone for UiO-66-NH2 but also enhances the conductivity of the composites by accelerating the electron transfer in the matrix...
October 19, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/30338393/heavy-metals-pb-cd-cu-zn-ni-co-in-leafy-vegetables-collected-from-production-sites-their-potential-health-risk-to-the-general-population-in-shiraz-iran
#17
Samane Rahmdel, Maryam Rezaei, Jamileh Ekhlasi, Seyed Hossein Zarei, Masoumeh Akhlaghi, Seyedeh Maryam Abdollahzadeh, Razieh Sefidkar, Seyed Mohammad Mazloomi
Heavy metal contamination of vegetables is a great public health concern. One hundred samples of spinach, dill, cilantro, and cress from the production sites of Shiraz, Iran, and its outskirts were, therefore, examined for lead (Pb), cadmium (Cd), copper (Cu), zinc (Zn), nickel (Ni), and cobalt (Co) content. The potential health risks of these metals to local residents via the consumption of leafy vegetables were also estimated. The mean concentrations of Pb, Cd, Cu, Zn, Ni, and Co were 3.21, 0.28, 4.55, 40...
October 18, 2018: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/30336616/heavy-metal-bioaccumulation-in-rice-from-a-high-geological-background-area-in-guizhou-province-china
#18
Xiangyu Kong, Ting Liu, Ziheng Yu, Zhe Chen, Da Lei, Zhiwei Wang, Hua Zhang, Qiuhua Li, Shanshan Zhang
Long-term exposure to high levels of heavy metals can lead to a variety of diseases. In recent years, researchers have paid more attention to mining and smelting areas, industrial areas, and so forth, but they have neglected to report on high geological background areas where heavy metal levels are higher than China's soil environmental quality standard (GB 15618-2018). In our study, an investigation of heavy metals in paddy soil and rice in the high background area of Guizhou Province was carried out, and the factors affecting the absorption and utilization of heavy metals in rice were discussed...
October 17, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/30336333/carboxymethyl-cellulose-polyacrylamide-composite-hydrogel-for-cascaded-treatment-reuse-of-heavy-metal-ions-in-wastewater
#19
Chirag B Godiya, Xiao Cheng, Dawei Li, Zhan Chen, Xiaolin Lu
A new bio-based bilateral hydrogel containing carboxymethyl cellulose (CMC) and polyacrylamide (PAM) was prepared for the wastewater remediation. The obtained CMC/PAM composite hydrogel reveals a strong single-ion affinity for copper (CuII ), lead (PbII ) and cadmium (CdII ) ions, as well as multi-ion absorbability with its equilibrium data following the Langmuir adsorption model and its adsorption process abiding by a pseudo-second-order kinetics. To demonstrate its recycled use for the metal ions, the adsorbed CuII ions in the hydrogel were reduced in situ to form homogeneously dispersed Cu nanoparticles (NPs), leading to the Cu NPs-loaded CMC/PAM hydrogel...
October 6, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/30336006/polyaniline-nanofiber-electrodes-for-reversible-capture-and-release-of-mercury-ii-from-water
#20
Yoonseob Kim, Zhou Lin, Intak Jeon, Troy Van Voorhis, Timothy M Swager
π-Conjugated polyaniline nanofiber networks are an attractive material platform for reversible and selective capture and release of toxic heavy metal ions from water. The nanofiber geometry facilitates fastsorption kinetics, sulfur functionalization of the backbone for improved adsorption, and electrochemical control of the oxidation (charge) state for reversible triggered sorption/desorption of metal ions. These active materials also function as sensors in that the sorption of mercury ions can be detected by analysis of cyclic voltammograms...
October 18, 2018: Journal of the American Chemical Society
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