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https://www.readbyqxmd.com/read/28822814/assessment-of-drinking-water-quality-at-the-tap-using-fluorescence-spectroscopy
#1
Masoumeh Heibati, Colin A Stedmon, Karolina Stenroth, Sebastien Rauch, Jonas Toljander, Melle Säve-Söderbergh, Kathleen R Murphy
Treated drinking water may become contaminated while travelling in the distribution system on the way to consumers. Elevated dissolved organic matter (DOM) at the tap relative to the water leaving the treatment plant is a potential indicator of contamination, and can be measured sensitively, inexpensively and potentially on-line via fluorescence and absorbance spectroscopy. Detecting elevated DOM requires potential contamination events to be distinguished from natural fluctuations in the system, but how much natural variation to expect in a stable distribution system is unknown...
August 8, 2017: Water Research
https://www.readbyqxmd.com/read/28818018/effect-of-operational-parameters-and-pd-in-catalyst-in-the-reduction-of-nitrate-using-copper-electrode
#2
Thiago Favarini Beltrame, Vanessa Coelho, Luciano Marder, Jane Zoppas Ferreira, Fernanda Albana Marchesini, Andrea Moura Bernardes
Water with high concentration of nitrate may cause damage to health and to the environment. This study investigated how concentration, current density, flow, pH, the use of Pd/In catalyst and operating mode (constant current density and constant cell potential) have an influence in the electrochemical reduction of nitrate and in the formation of gaseous compounds using copper electrode. Experiments were performed in two-compartment electrolytic cells separated by a cationic membrane with nitrate model solutions prepared as a surrogate of concentrated brines from membrane desalination plants...
August 18, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28800363/the-viability-of-lytic-bacteriophage-%C3%AE-d5-in-potato-associated-environments-and-its-effect-on-dickeya-solani-in-potato-solanum-tuberosum-l-plants
#3
Robert Czajkowski, Anna Smolarska, Zofia Ozymko
Dickeya solani is one of the most important pectinolytic phytopathogens responsible for high losses in potato, especially in seed potato production in Europe. Lytic bacteriophages can affect the structure of the host population and may influence spread, survival and virulence of the pathogen and in consequence, infection of the plant. In this study, we aimed to acquire information on the viability of the broad host lytic bacteriophage ΦD5 on potato, as well as to apprehend the specific effect of this bacteriophage on its host D...
2017: PloS One
https://www.readbyqxmd.com/read/28799933/heavy-metal-content-of-swedish-municipal-wastewater-sludge-status-and-goals
#4
A Mattsson, A Finnson, D I'Ons
In 2014, 25% of the sludge produced at Swedish municipal wastewater treatment plants was applied to agricultural land. Even though the Swedish heavy metal limits for sludge to be used in agriculture are amongst the most stringent in the EU, more stringent heavy metal limits are proposed. Most sludge applied to agricultural land is recycled within a certification system, Revaq. Revaq has targets for control at source management and improvement of sludge quality. Statistics based on data collected within the Revaq system was used to differentiate between local and general sources of heavy metals and assess the need to improve sludge quality...
August 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28796823/assessment-of-photocatalytic-potentiality-and-determination-of-ecotoxicity-using-plant-model-for-better-environmental-applicability-of-synthesized-copper-copper-oxide-and-copper-doped-zinc-oxide-nanoparticles
#5
Debadrito Das, Animesh Kumar Datta, Divya Vishambhar Kumbhakar, Bapi Ghosh, Ankita Pramanik, Sudha Gupta, Aninda Mandal
NPS SYNTHESIS, CHARACTERIZATION AND AZO-DYE DEGRADATION: A facile cost effective wet chemical method of synthesis is proposed for Cu-NPs, CuO-NPs and Cu-doped ZnO-NPs. The nanomaterials are opto-physically characterized for nano standard quality. Cu-doped ZnO-NPs based catalytic system is found to possess most efficient photocatalytic activity in degradation of two organic azo-dyes namely methyl red (MR) and malachite green (MG) that are released as industrial effluents in eco-environment intercollegium...
2017: PloS One
https://www.readbyqxmd.com/read/28796373/environmental-behavior-potential-phytotoxicity-and-accumulation-of-copper-oxide-nanoparticles-and-arsenic-to-rice-plants
#6
REVIEW
Jing Liu, Birendra Dhungana, George P Cobb
Copper oxide nanoparticles (nCuO) are widely used in many industries. The increasing release of nCuO from both intentional and unintentional sources into the environment may pose risks to rice plants, thereby reducing the quality or quantity of this staple grain in the human diet. Arsenic (As) contamination has not only decreased rice yield, As accumulation in rice has also been a great human health concern for a few decades. New technologies have succeeded in removing As from water by nanomaterials. By all accounts, few studies address nCuO phytotoxicity to rice, and the interactions of nCuO with As are poorly described...
August 10, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28791581/phytoextraction-of-potentially-toxic-elements-by-six-tree-species-growing-on-hazardous-mining-sludge
#7
Mirosław Mleczek, Piotr Goliński, Magdalena Krzesłowska, Monika Gąsecka, Zuzanna Magdziak, Paweł Rutkowski, Sylwia Budzyńska, Bogusława Waliszewska, Tomisław Kozubik, Zbigniew Karolewski, Przemysław Niedzielski
The aim of the study was to compare the phytoextraction abilities of six tree species (Acer platanoides L., Acer pseudoplatanus L., Betula pendula Roth, Quercus robur L., Tilia cordata Miller, Ulmus laevis Pall.), cultivated on mining sludge contaminated with arsenic (As), cadmium (Cd), copper (Cu), lead (Pb), thallium (Tl), and zinc (Zn). All six tree species were able to survive on such an unpromising substrate. However, A. platanoides and T. cordata seedlings grown on the polluted substrate showed significantly lower biomass than control plants (55...
August 9, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28780412/atmospheric-emissions-of-cu-and-zn-from-coal-combustion-in-china-spatio-temporal-distribution-human-health-effects-and-short-term-prediction
#8
Rui Li, Junlin Li, Lulu Cui, Yu Wu, Hongbo Fu, Jianmin Chen, Mindong Chen
China has become the largest coal consumer and important emitter of trace metals in the world. A multiple-year inventory of atmospheric copper (Cu) and zinc (Zn) emissions from coal combustion in 30 provinces of China and 4 economic sectors (power plant, industry sector, residential sector, and others) for the period of 1995-2014 has been calculated. The results indicated that the total emissions of Cu and Zn increased from 5137.70 t and 11484.16 t in 1995-7099.24 t and 14536.61 t in 2014, at an annual average growth rate of 1...
August 3, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28780124/antitumour-activity-of-resveratrol-on-human-melanoma-cells-a-possible-mechanism-related-to-its-interaction-with-malignant-cell-telomerase
#9
Chiara Platella, Serena Guida, Laura Bonmassar, Angelo Aquino, Enzo Bonmassar, Giampiero Ravagnan, Daniela Montesarchio, Giovanni N Roviello, Domenica Musumeci, Maria Pia Fuggetta
BACKGROUND: trans-resveratrol (tRES) is a polyphenolic stilbene found in plant products which has attracted great attention because of its antioxidant, anti-inflammatory and anticancer properties. METHODS: The possible correlation between tRES-induced suppression of melanoma cell growth and its influence on telomerase expression has been investigated by biological assays. Moreover, in order to gain new knowledge about possible mechanisms of action of tRES as antineoplastic agent, its interaction with biologically relevant secondary structure-forming DNA sequences, its aggregation properties and copper-binding activity have been studied by CD, UV and fluorescence spectroscopies...
August 2, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28777962/effect-of-graphene-oxide-on-copper-stress-in-lemna-minor-l-evaluating-growth-biochemical-responses-and-nutrient-uptake
#10
Changwei Hu, Lei Liu, Xiuling Li, Yundi Xu, Zhigang Ge, Yongjun Zhao
The wide application and unique properties of graphene oxide (GO) make it to interact with other pollutants and subsequently alter their behavior and toxicity. We evaluated the influences of GO at different concentrations (1 and 5mg/L) on copper (Cu) stress in duckweed (Lemna minor L.) GO below a concentration of 5mg/L showed no adverse effects on L. minor. The addition of Cu above 10μM represented a stress condition, which was evidenced by various parameters such as frond number, percent inhibition of growth rate (Ir), total chlorophyll content, dry weight, superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD)...
July 27, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28777094/in-crystallo-activity-tests-with-latent-apple-tyrosinase-and-two-mutants-reveal-the-importance-of-the-mutated-sites-for-polyphenol-oxidase-activity
#11
Ioannis Kampatsikas, Aleksandar Bijelic, Matthias Pretzler, Annette Rompel
Tyrosinases are type 3 copper enzymes that belong to the polyphenol oxidase (PPO) family and are able to catalyze both the ortho-hydroxylation of monophenols and their subsequent oxidation to o-quinones, which are precursors for the biosynthesis of colouring substances such as melanin. The first plant pro-tyrosinase from Malus domestica (MdPPO1) was recombinantly expressed in its latent form (56.4 kDa) and mutated at four positions around the catalytic pocket which are believed to influence the activity of the enzyme...
August 1, 2017: Acta Crystallographica. Section F, Structural Biology Communications
https://www.readbyqxmd.com/read/28775152/atacs8-plays-a-critical-role-in-the-early-biosynthesis-of-ethylene-elicited-by-copper-ions-in-arabidopsis
#12
Baogang Zhang, Haifeng Liu, Xinhua Ding, Jiajia Qiu, Min Zhang, Zhaohui Chu
Copper ions (Cu(2+)) are required by all living organisms and play important roles in many bactericides and fungicides. We previously reported that Cu(2+) could elicit defense responses, which is dependent on the ethylene signaling pathway in Arabidopsis. However, the mechanism by which Cu(2+) elicit the biosynthesis of ethylene remains unclear. Here, we show that CuSO4 treatment rapidly increases the production of ethylene. In addition, it up-regulates the expression of several defense-related genes as well as ethylene biosynthesis genes (including S-adenosylmethionine synthase genes, 1-aminocyclopropane-1-carboxylate (ACC) synthase (ACS) genes, and ACC oxidase genes...
August 3, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28772910/in-situ-production-of-copper-oxide-nanoparticles-in-a-binary-molten-salt-for-concentrated-solar-power-plant-applications
#13
Mathieu Lasfargues, Graham Stead, Muhammad Amjad, Yulong Ding, Dongsheng Wen
Seeding nanoparticles in molten salts has been shown recently as a promising way to improve their thermo-physical properties. The prospect of such technology is of interest to both academic and industrial sectors in order to enhance the specific heat capacity of molten salt. The latter is used in concentrated solar power plants as both heat transfer fluid and sensible storage. This work explores the feasibility of producing and dispersing nanoparticles with a novel one pot synthesis method. Using such a method, CuO nanoparticles were produced in situ via the decomposition of copper sulphate pentahydrate in a KNO₃-NaNO₃ binary salt...
May 19, 2017: Materials
https://www.readbyqxmd.com/read/28771998/biomining-of-metals-how-to-access-and-exploit-natural-resource-sustainably
#14
Carlos A Jerez
Mining activities have been carried out for thousands of years and nowadays have an enormous worldwide use to obtain important metals of industrial use. These include copper, iron, gold and several others. Although modern mining companies have sustainable mining programs that include tailings management and external verifications, it is recognized that these industrial activities are responsible for a significant damage to the environment. Specially, technologies such as smelting and roasting generate very toxic emissions, including solid particles in the air, very large tailings and contribute to generate acid mine drainage (AMD) that affects humans health and all kinds of living plants, animals and microorganisms...
August 3, 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/28771344/interactions-transformations-and-bioavailability-of-nano-copper-exposed-to-root-exudates
#15
Yuxiong Huang, Lijuan Zhao, Arturo A Keller
Due to the potential for interactions between crop plants and engineered nanomaterials (ENMs), there is increasing interest in understanding the bioavailability and effects of ENMs released into soil systems. Here we investigate the influence of root exudates on the fate of ENMs from a thermodynamic perspective. Nano isothermal titration calorimetry was applied to determine thermodynamic parameters for the interaction between nano-copper (nCu) and synthetic root exudate (SRE) and its components (including sugars, organic acids, amino acids and phenolic acids), as well as Cu2+ and SRE...
August 3, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28769905/high-throughput-chemical-screening-identifies-compounds-that-inhibit-different-stages-of-the-phytophthora-agathidicida-and-phytophthora-cinnamomi-life-cycles
#16
Scott A Lawrence, Charlotte B Armstrong, Wayne M Patrick, Monica L Gerth
Oomycetes in the genus Phytophthora are among the most damaging plant pathogens worldwide. Two important species are Phytophthora cinnamomi, which causes root rot in thousands of native and agricultural plants, and Phytophthora agathidicida, which causes kauri dieback disease in New Zealand. As is the case for other Phytophthora species, management options for these two pathogens are limited. Here, we have screened over 100 compounds for their anti-oomycete activity, as a potential first step toward identifying new control strategies...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28766401/evaluation-of-a-pomegranate-peel-extract-pge-as-alternative-mean-to-control-olive-anthracnose
#17
Sonia Pangallo, Maria Giulia Li Destri Nicosia, Giovanni Enrico Agosteo, Ahmed Abdelfattah, Flora Valeria Romeo, Santa O Cacciola, Paolo Rapisarda, Leonardo Schena
Olive anthracnose is caused by different species of Colletotrichum spp. and may be regarded as the most damaging disease of olive fruits worldwide, greatly affecting quality and quantity of the productions. A pomegranate peel extract (PGE) proved very effective in controlling the disease. The extract had a strong in vitro fungicidal activity against Colletotrichum acutatum sensu stricto, was very effective in both preventive and curative trials with artificially inoculated fruit, and induced resistance in treated olive tissues...
August 2, 2017: Phytopathology
https://www.readbyqxmd.com/read/28760553/genome-wide-identification-of-sweet-orange-citrus-sinensis-metal-tolerance-proteins-and-analysis-of-their-expression-patterns-under-zinc-manganese-copper-and-cadmium-toxicity
#18
Xing-Zheng Fu, Ya-Hua Tong, Xue Zhou, Li-Li Ling, Chang-Pin Chun, Li Cao, Ming Zeng, Liang-Zhi Peng
Plant metal tolerance proteins (MTPs) play important roles in heavy metal homeostasis; however, related information in citrus plants is limited. Citrus genome sequencing and assembly have enabled us to perform a systematic analysis of the MTP gene family. We identified 12 MTP genes in sweet orange, which we have named as CitMTP1 and CitMTP3 to CitMTP12 based on their sequence similarity to Arabidopsis thaliana MTPs. The CitMTPs were predicted to encode proteins of 864 to 2556 amino acids in length that included 4 to 6 putative transmembrane domains (TMDs)...
July 28, 2017: Gene
https://www.readbyqxmd.com/read/28758909/exogenous-gr24-alleviates-cadmium-toxicity-by-reducing-cadmium-uptake-in-switchgrass-panicum-virgatum-seedlings
#19
Zhenglan Tai, Xinqiang Yin, Zhigang Fang, Gaoling Shi, Laiqing Lou, Qingsheng Cai
Strigolactones (SLs) are classified into plant hormones, playing a key role as a mediator of plant growth in response to several abiotic stresses, including drought and salinity. However, the role of SLs in cadmium (Cd)-induced stress to plants is still unknown. The physiological responses of switchgrass (Panicum virgatum) stressed in 10 μmol L(-1) Cd to exogenous synthetic SLs analog, GR24 were studied in hydroponics. The Cd stress significantly caused the adverse effects on plant growth and root morphology, inhibited photosynthesis, but boosted lipid peroxidation of Switchgrass seedlings...
July 29, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28746617/resistance-of-xanthomonas-euvesicatoria-strains-from-brazilian-pepper-to-copper-and-zinc-sulfates
#20
Maysa S Areas, Ricardo M Gonçalves, José M Soman, Ronaldo C Souza, Ricardo Gioria, Tadeu A F DA Silva, Antonio C Maringoni
Bacterial spot, caused by Xanthomonas spp., is one of the major bacterial diseases in pepper (Capsicum annuum L.). The infection results in reduced crop yield, particularly during periods of high rainfall and temperature, due to the low efficiency of chemical control with copper bactericides. This study evaluated the copper and zinc sulfate sensitivity of 59 pathogenic strains of Xanthomonas euvesicatoria isolated from pepper plants produced in various regions throughout Brazil. Both the respective sulfates and a mixture thereof was evaluated at 50, 100, 200 and 400 μg...
July 24, 2017: Anais da Academia Brasileira de Ciências
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