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https://www.readbyqxmd.com/read/29054098/computational-study-to-understand-the-energy-transfer-pathways-within-amicyanin
#1
Ramachandran Gnanasekaran
Vibrational energy diffusivities between the residues present in Amicyanin copper protein are calculated and presented in form of communication map. From those results energy flow pathways from the copper metal ion to the inter protein residue Glu31 are identified. Our finding suggests many different pathways are possible and copper metal ion in oxidized and reduced state switches the pathways. Our finding also suggests the cooperative nature of surrounding residues and water molecules towards selecting the pathways...
October 8, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/29054082/ecological-risk-assessment-of-coastal-ecosystems-the-case-of-mangrove-forests-in-hormozgan-province-iran
#2
Saber Ghasemi, Sina Siavash Moghaddam, Amir Rahimi, Christos A Damalas, Abolfazl Naji
Sediment quality of mangrove forests in Hormozgan Province of Iran with a focus on two distinct habitats - the Hara Protected Area and the area of the Azini Bay - was studied. The accumulation of heavy metals in the sediments of the Hara Protected Area in terms of concentration was in the order of Pb > Zn > Cu > Cd and in those of the Azini Bay in the order of Zn > Cu > Pb > Cd. Based on Pearson's correlation coefficient, no significant correlations were found between concentrations of heavy metals in the sediments of the Hara Protected Area, while Zn and Pb concentrations were positively correlated in the sediments of the Azini Bay, implying a common pollution source...
October 9, 2017: Chemosphere
https://www.readbyqxmd.com/read/29054079/synergic-mechanism-of-adsorption-and-metal-free-catalysis-for-phenol-degradation-by-n-doped-graphene-aerogel
#3
Xiaohua Ren, Huanhuan Guo, Jinkui Feng, Pengchao Si, Lin Zhang, Lijie Ci
3D porous N-doped reduced graphene oxide (N-rGO) aerogels were synthesized by a hydrothermal reduction of graphene oxide (GO) with urea and following freeze-drying process. N-rGO aerogels have a high BET surface of 499.70 m(2)/g and a high N doping content (5.93-7.46 at%) including three kinds of N (graphitic, pyridinic and pyrrolic). Their high catalytic performance for phenol oxidation in aqueous solution was investigated by catalytic activation of persulfate (PS). We have demonstrated that N-rGO aerogels are promising metal-free catalysts for phenol removal...
October 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/29054011/one-pot-fabrication-of-n-doped-graphene-supported-dandelion-like-ptru-nanocrystals-as-efficient-and-robust-electrocatalysts-towards-formic-acid-oxidation
#4
Hui Xu, Bo Yan, Shumin Li, Jin Wang, Caiqin Wang, Jun Guo, Yukou Du
Engineering the architectures of metal nanocatalysts offers a valid approach for the development of electrocatalysts with greatly enhanced performances. Herein, we report the one-pot method to successfully fabricate the N-doped graphene (NG) supported dandelion-like PtRu nanocrystals. Such dandelion-like nanocrystals with different compositions can be readily tuned via the addition of different amounts of RuCl3. By virtue of the large accessible surface active areas, synergistic and electronic effect, as well as the successful introduction of NG, the as-obtained PtRu/NG with optimized compositions display outstandingly high electrocatalytic activity towards formic acid electrooxidation with the mass and specific activities of 1857...
October 13, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29053963/hydrilla-verticillata-employs-two-different-ways-to-affect-dna-methylation-under-excess-copper-stress
#5
Danlu Shi, Kai Zhuang, Yan Xia, Changhua Zhu, Chen Chen, Zhubing Hu, Zhenguo Shen
Because of the accumulation of heavy metals, Hydrilla verticillata (L.f.) Royle, a rooted submerged perennial aquatic herb, is being developed as a potential tool to clean the aquatic ecosystem polluted by heavy metals. However, its physiological responses for heavy metal remain to be elucidated. Here, through employing proteomics approach, we found that excess Cu significantly induced the expressions of four DNA methylation related proteins in H. verticillata, which were the homologues of two domains rearranged methyltransferases (DRM), a methyltransferases chromomethylase (CMT) and a histone H3 lysine-9 specific SUVH6-like (SUVH6)...
October 14, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29053962/identification-of-up-regulated-genes-from-the-metal-hyperaccumulator-aquatic-fern-salvinia-minima-baker-in-response-to-lead-exposure
#6
Daniel A Leal-Alvarado, A Martínez-Hernández, C L Calderón-Vázquez, D Uh-Ramos, G Fuentes, J H Ramírez-Prado, L Sáenz-Carbonell, J M Santamaría
Lead (Pb) is one of the most serious environmental pollutants. The aquatic fern Salvinia minima Baker is capable to hyper-accumulate Pb in their tissues. However, the molecular mechanisms involved in its Pb accumulation and tolerance capacity are not fully understood. In order to investigate the molecular mechanisms that are activated by S. minima in response to Pb, we constructed a suppression subtractive hybridization library (SSH) in response to an exposure to 40μM of Pb(NO3)2 for 12h. 365 lead-related differentially expressed sequences tags (ESTs) were isolated and sequenced...
October 16, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29053961/maturation-of-xenopus-laevis-oocytes-under-cadmium-and-lead-exposures-cell-biology-investigations
#7
Sylvain Slaby, Julie Hanotel, Guillaume Marchand, Arlette Lescuyer, Jean-François Bodart, Alain Leprêtre, Sébastien Lemière, Matthieu Marin
Since amphibians are recognised as good models to assess the quality of environments, only few studies have dealt with the impacts of chemical contaminants on their gametes, while toxic effects at this stage will alter all the next steps of their life cycle. Therefore, we propose to investigate the oocyte maturation of Xenopus laevis in cadmium- and lead-contaminated conditions. The impacts of cadmium and lead ions were explored on events involved in the hormone-dependent process of maturation. In time-course experiments, cadmium, at the highest concentration, delayed and prevented the germinal vesicle breakdown...
October 16, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/29053929/characterizing-workforces-exposed-to-current-and-emerging-non-carbonaceous-nanomaterials-in-the-u-s
#8
Kelsey R Babik, Matthew M Dahm, Kevin H Dunn, Kevin L Dunn, Mary K Schubauer-Berigan
OBJECTIVE: Toxicology studies suggest that exposure to certain types of engineered nanomaterials (ENMs) may cause adverse health effects, but little is known about the workforce in the United States that produces or uses these materials. In addition, occupational exposure control strategies in this industry are not well characterized. This study identified US ENM manufacturers and users (other than carbon nanotubes and nanofibers, which have been characterized elsewhere), determined workforce size, characterized types and quantities of materials used, occupational exposure control strategies, and the feasibility of occupational ENM exposure studies...
October 20, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/29053610/lab-on-chip-surface-enhanced-raman-analysis-by-aerosol-jet-printing-and-roll-to-roll-hot-embossing
#9
Anne Habermehl, Noah Strobel, Ralph Eckstein, Nico Bolse, Adrian Mertens, Gerardo Hernandez-Sosa, Carsten Eschenbaum, Uli Lemmer
Surface-enhanced Raman spectroscopy (SERS) combines the high specificity of Raman scattering with high sensitivity due to an enhancement of the electromagnetic field by metallic nanostructures. However, the tyical fabrication methods of SERS substrates suffer from low throughput and therefore high costs. Furthermore, point-of-care applications require the investigation of liquid solutions and thus the integration of the SERS substrate in a microfluidic chip. We present a roll-to-roll fabrication approach for microfluidics with integrated, highly efficient, surface-enhanced Raman scattering structures...
October 20, 2017: Sensors
https://www.readbyqxmd.com/read/29053475/bnc-nanoshells-a-novel-structure-for-atomic-storage
#10
F W N Silva, E Cruz-Silva, M Terrones, H Terrones, E B Barros
Quantum molecular dynamics (QMD) and density functional theory are employed in this work in order to study the structural and electronic properties of carbon, boron nitride or hybrid BNC nanoshells. The studied nanoshells can be formed by stacking two zigzag graphene nanoribbons, two zigzag boron nitride nanoribbons or one zigzag graphene nanoribbon on a boron nitride nanoribbon. In all cases only one of the edges of the ribbon is passivated, while the other one is left unpassivated. Our QMD results show that these nanoribbons collapse just a few femtoseconds after the beginning of the simulation, forming a coalesced structure in the shape of a shell...
October 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29053473/enhancing-raman-signals-through-electromagnetic-hot-zones-induced-by-magnetic-dipole-resonance-of-metal-free-nanoparticles
#11
Yi-Chuan Tseng, Yang-Chun Lee, Sih-Wei Chang, Tzu-Yao Lin, Dai-Liang Ma, Bo-Cheng Lin, Hsuen-Li Chen
In this study, we found that the large area of electromagnetic field hot zone induced through magnetic dipole resonance of metal-free structures can greatly enhance Raman scattering signals. The magnetic resonant nanocavities, based on high-refractive-index silicon nanoparticles (SiNPs), were designed to resonate at the wavelength of the excitation laser of the Raman system. The well-dispersed SiNPs that were not closely packed displayed significant magnetic dipole resonance and gave a Raman enhancement per unit volume of 59 347...
October 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29053366/heavy-metal-pb-accumulation-in-metallophytes-as-influenced-by-the-variations-in-rhizospheric-and-non-rhizospheric-soils-physico-chemical-characteristics
#12
Sifau A Adejumo, Sarita Tiwari, Vilas Shinde, Bijaya Ketan Sarangi
Activities at root-soil interface determine the solubility and uptake of metals by plants. Metal accumulation in plant species (Imperata cylindrical, Cynodon dactylon, Eleucine indica, Gomphrena celosoides, Sporobolus pyramidalis, Chromolaena odorata and Rhynchospora corymbosa) growing on Pb contaminated site as influenced by variations in physico-chemical characteristics, dissolved organic matter (DOM), Pb fractionation and different functional groups (using Fourier Transmittance Infra-red) of rhizospheric and non-rhizospheric soils was assessed...
October 20, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/29053353/effect-of-two-biodegradable-chelates-on-metals-uptake-translocation-and-biochemical-changes-of-lantana-camara-growing-in-fly-ash-amended-soil
#13
Shikha Kumari Pandey, Tanushree Bhattacharya
The present work had two purposes firstly to evaluate the potential of Lantana Camara for phytoextraction of heavy metals from fly ash amended soil and to assess the suitability of a proper biodegradable chelating agent for chelate assisted phytoextraction. Plants were grown in manure mixed soil amended with various concentration of fly ash. Two biodegradable chelating agents were added (EDDS and MGDA) in the same dose separately before maturation stage. Sampling was done at different growing stages. The plant took up metal in different plant parts in the following order: for Cu, and Zn leaf >root >stem, for Cr and Mn leaf>stem >root, for Ni root >leaf>stem and for Pb root≈leaf>stem respectively...
October 20, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/29053352/bioaccumulation-and-rhizofiltration-potential-of-pistia-stratiotes-l-for-mitigating-water-pollution-in-the-egyptian-wetlands
#14
Tarek M Galal, Ebrahim M Eid, Mohammed A Dakhil, Loutfy M Hassan
The bioaccumulation and rhizofiltration potential of P. stratiotes for heavy metals were investigated to mitigate water pollution in the Egyptian wetlands. Plant and water samples were collected monthly through nine quadrats equally distributed along three sites at Al-Sero drain in Giza Province. The annual mean of the shoot biomass was 10 times that of the root. The concentrations of shoot heavy metals fell in the order: Fe > Mn > Cr > Pb > Cu > Zn > Ni > Co > Cd, while that of the roots were: Fe > Mn > Cr > Pb > Zn > Ni > Co > Cu > Cd...
October 20, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/29053350/melatonin-affects-the-growth-and-cadmium-accumulation-of-malachium-aquaticum-and-galinsoga-parviflora
#15
Yi Tang, Lijin Lin, Yongdong Xie, Ji Liu, Guochao Sun, Huanxiu Li, Ming'an Liao, Zhihui Wang, Dong Liang, Hui Xia, Xun Wang, Jing Zhang, Zejing Liu, Zhi Huang, Zhongqun He, Lihua Tu
Phytoremediation technology has become one of the main techniques for remediating soils polluted by heavy metals because it does not damage the environment, but heavy metal-tolerant plants have the disadvantages of low biomass and slow growth. A pot experiment was conducted to study the effects of melatonin (Mel) on growth and cadmium (Cd) accumulation in the Cd accumulator Malachium aquaticum and hyperaccumulator Galinsoga parviflora by spraying different concentrations of Mel on them. The results showed that shoot biomass, photosynthetic pigment content and antioxidant enzyme activity were increased in both species after Mel was sprayed on their leaves...
October 20, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/29053349/essential-metal-and-metalloid-elements-in-the-philippi-horticultural-area-and-their-uptake-into-selected-vegetable-crops
#16
Marÿke Malan, Francuois Müller, Lincoln Raitt, Lilburne Cyster, Luc Brendonck
This study evaluated Co, Cr, Mn, Ni, Se, Sn and V status in the soils of the PHA, as well as the vegetables produced on these soils. We also determined the agronomic sources of these elements to the soils in the PHA. Farmyard manures applied as fertilizer amendments to the soils in the PHA were found to be the major agronomic sources of the metal and metalloid elements. These elements were however, retained in significantly higher concentrations in the soils compared to the concentrations found in the edible portions of the vegetable crops collected...
October 20, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/29053347/phytotoxicity-of-tin-mine-waste-and-accumulation-of-involved-heavy-metals-in-common-buckwheat-fagopyrum-esculentum-moench
#17
Jürgen Franzaring, Walter Damsohn, Andreas Fangmeier, Sonja Schlosser, Hannes Kurz, Philipp Büttner
Extraction and processing of cassiterite (SnO2) left large tailings with high concentrations of tin, tungsten, molybdenum and lithium. Information on the phytotoxicity of mine waste is important with regard to ecological hazards. Exposure studies help to identify plants useful for the stabilization of waste tips and the phytomining of metals. A greenhouse study was performed using a dilution series of mine waste and four crops, a halophytic and a metallophytic species to derive dose response curves. Based on effective doses for growth reductions, sensitivity increased in the following order: maize > common buckwheat > quinoa > garden bean...
October 20, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/29053345/an-ecofriendly-approach-for-bioremediation-of-contaminated-water-environment-potential-contribution-of-a-coastal-seaweed-community-to-environmental-improvement
#18
Fatih Deniz, Elif Tezel Ersanli
High levels of heavy metals like copper ions in many industrial based effluents lead to serious environmental and health problems. Biosorption is a potential environmental biotechnology approach for biotreatment of aquatic sites polluted with heavy metal ions. Seaweeds have received great attention for their high bioremediation potential in recent years. However, the co-application of marine macroalgae for removal of heavy metals from wastewater is very limited. Thus, for the first time in literature, a coastal seaweed community composed of Chaetomorpha sp...
October 20, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/29053343/efficiency-of-opuntia-ficus-in-the-phytoremediation-of-a-soil-contaminated-with-used-motor-oil-and-lead-compared-to-that-of-lolium-perenne-and-aloe-barbadendis
#19
Luisa F Escobar-Alvarado, Mabel Vaca-Mier, Raymundo López-Callejas, Ma Neftalí Rojas-Valencia
Industrial pollutants such as heavy metals and hydrocarbons in soils represent a serious concern due to their persistence and negative effects on the environment, affecting cellular processes in living organisms and even causing mutations and cancer. The main objectives of this work were to evaluate the efficiency of Opuntia ficus in the phytoremediation of a soil polluted with used motor oil. Two other species, one with different and one with similar characteristics, relatively, were used for comparison purposes: Lolium perenne and Aloe barbadensis...
October 20, 2017: International Journal of Phytoremediation
https://www.readbyqxmd.com/read/29053340/the-beneficial-role-of-potassium-in-cd-induced-stress-alleviation-and-growth-improvement-in-gladiolus-grandiflora-l
#20
Nasim Ahmad Yasin, Malik Muhammad Zaheer, Waheed Ullah Khan, Sajid Rashid Ahmad, Aqeel Ahmad, Aamir Ali, Waheed Akram
Heavy metal contaminated agricultural soils are one of the most important constraints for successful cultivation of crops. The current research was conducted to evaluate the role of potassium (K) on plant growth and amelioration of cadmium (Cd) stress in Gladiolus grandiflora under greenhouse conditions. G. grandiflora corms were sown in media contaminated with 0 (C), 50 (Cd50) and 100 (Cd100) mg Cd kg(-1) soil. The plants growing in Cd-contaminated media exhibited reduced gas exchange attributes, chlorophyll (Chl) contents, vegetative and reproductive growth as compared to control...
October 20, 2017: International Journal of Phytoremediation
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