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Hui Li, Wenzhuo Chen, Fenfen Xu, Xiaodong Fan, Tongxiang Liang, Xiaopeng Qi, Wei Tian
Fluorescent supramolecular polymers are an important kind of smart material. In this work, a new fluorescent supramolecular hyperbranched polymer (FSHP) is constructed by orthogonal self-assembly: pillararene-based host-guest interaction and metal ion complexation interaction. The FSHP exhibits concentration-controllable fluorescence emissions. The photoluminescence spectra and light-emitting colors of FSHP can be effectively tuned by changing metal ion types or using mixed metal ions. The fluorescence quenching of FSHP solutions or FSHP-based films would occur when removing the metal ions from the backbone of FSHP...
April 14, 2018: Macromolecular Rapid Communications
Nir Waiskopf, Yuval Ben-Shahar, Uri Banin
Hybrid semiconductor-metal nanoparticles (HNPs) manifest unique combined and often synergetic properties stemming from the materials combination. These structures exhibit spatial charge separation across the semiconductor-metal junction upon light absorption, enabling their use as photocatalysts. So far, the main impetus of photocatalysis research in HNPs addresses their functionality in solar fuel generation. Recently, it was discovered that HNPs are functional in efficient photocatalytic generation of reactive oxygen species (ROS)...
April 14, 2018: Advanced Materials
Kyle D Gilroy, Xuan Yang, Shuifen Xie, Ming Zhao, Dong Qin, Younan Xia
Controlling the surface structure of metal nanocrystals while maximizing the utilization efficiency of the atoms is a subject of great importance. An emerging strategy that has captured the attention of many research groups involves the conformal deposition of one metal as an ultrathin shell (typically 1-6 atomic layers) onto the surface of a seed made of another metal and covered by a set of well-defined facets. This approach forces the deposited metal to faithfully replicate the surface atomic structure of the seed while at the same time serving to minimize the usage of the deposited metal...
April 14, 2018: Advanced Materials
Dmitri Konarev, Alexey Kuzmin, Salavat Khasanov, Aleksey Fatalov, Evgenia Yudanova, Rimma Lyubovskaya
Reduction methods for preparation of coordination complexes of titanium(II) and indium(III) phthalocyanines with organic dyes such as indigo, thioindigo and squarylium dye III (SQ) have been developed which allow one to obtain crystalline {cryptand(K+)}{(cis-indigo-O,O)(0)Ti(II)[Pc(2-)}(Cl-).C6H4Cl2 (1), {cryptand(K+)}{(cis-thioindigo-O, O)(2-)In(III)[Pc(2-)]}(-).C6H4Cl2 (2) and {cryptand(K+)}{[(SQ)2-O, O](2-)In(III)[Pc(2-)]}(-).3.5C6H4Cl2 (3) complexes. The formation of these complexes is accompanied by the reduction of starting dyes or metal phthalocyanines...
April 14, 2018: Chemistry: a European Journal
Mariolina Gullì, Laura Marchi, Rosaria Fragni, Annamaria Buschini, Giovanna Visioli
The Ni hyperaccumulator Noccaea caerulescens has adapted to live in a naturally stressed environment, evolving a complex pattern of traits to cope with adverse conditions. Evidence is accumulating regarding the important role of epigenetic modifications in regulating plant responses to stress. In this study, we present data from the natural "open-field" adaptation of the Ni hyperaccumulator N. caerulescens to serpentine soil and provide the first evidence of the involvement of epigenetic changes in response to the high Ni content present in plant leaves...
April 15, 2018: Environmental and Molecular Mutagenesis
Mario Alejandro Muñoz-Nájera, Guadalupe Barrera-Escorcia, Patricia Ramírez-Romero, Felipe Omar Tapia-Silva, Ricardo Rosas-Cedillo
Oreochromis niloticus was used to determine the effects of heavy metals and their concentration in aquatic environments. Its wide distribution, resistance, and economical importance make it a suitable biomonitor. The present study was conducted in the Tenango Dam (Puebla, Mexico) to determine water quality and its impact on O. niloticus, a species that is cultured and commercialized in this area. Five samples were collected over 1 year to evaluate the water's physicochemical parameters (temperature, dissolved oxygen, pH, and hardness) and metal contents (cadmium, chromium, copper, and lead)...
April 14, 2018: Environmental Monitoring and Assessment
Mehran Bozorgi, Saeed Abbasizadeh, Faranak Samani, Seyyed Ebrahim Mousavi
The performance of synthesized cast and electrospun polyvinyl alcohol/chitosan/zinc oxide/aminopropyltriethoxylsilane (PVA/chitosan/ZnO-APTES) nano-adsorbents were compared in removal of Cd(II) and Ni(II) ions from wastewater. The adsorbents were characterized by SEM, BET, FTIR and TGA analyses. Furthermore, the swelling investigations were carried out to study the adsorbent stability in aqueous solution. The effect of several parameters such as contents of ZnO-NH2 , contact time, initial Cd(II) and Ni(II) concentration and temperature on the adsorption capacity was investigated in a batch mode...
April 14, 2018: Environmental Science and Pollution Research International
Ming-Xi Zhou, Hélène Dailly, Marie-Eve Renard, Rui-Ming Han, Stanley Lutts
Data regarding NaCl impact on halophyte plant species exposed to a polymetallic contamination remain scarce. Seedlings of the salt marsh species Kosteletzkya pentacarpos were simultaneously exposed to cadmium (10 μM) and zinc (100 μM) in the absence or presence of 50 mM NaCl. Heavy metal exposure reduced plant growth and increased Cd and Zn concentrations in all organs. Cd and Zn accumulation reduced net photosynthesis in relation to stomatal closure, decreased in chlorophyll concentration and alteration in chlorophyll fluorescence-related parameters...
April 14, 2018: Environmental Science and Pollution Research International
Yongxiang Han, Zhanglin Ni, Shiliang Li, Minghua Qu, Fubin Tang, Runhong Mo, Caifen Ye, Yihua Liu
Walnut is one of the most popular nuts worldwide and contains various mineral nutrients. Little is known, however, about the relationship between toxic heavy metals in walnuts and growth soil. In this study, we investigated the distribution, relationship, and risk assessment of five toxic heavy metals-lead (Pb), arsenic (As), chromium (Cr), cadmium (Cd), and mercury (Hg)-in walnuts and growth soil in the main production areas of China. The results showed that the main heavy metal pollution in walnut and soil was Pb and Cd...
April 14, 2018: Environmental Science and Pollution Research International
Yao Lu, Deliang He, Huibin Lei, Jun Hu, Houqiang Huang, Huiying Ren
Taro stalks (TS) were modified by diethylenetriamine (DETA) to obtain the modified taro stalks adsorbents (recorded as MTSA). This kind of raw material is unprecedented and the method of modification is relatively simple. The physicochemical properties of MTSA were characterized by scanning electron microscope (SEM), FTIR, and zeta potential analyzer. The capacity of MTSA for adsorbing heavy metals under different influencing factors was tested by UV-visible spectrophotometer. The results indicated that the gaps between the microspheres of MTSA are more, which are conducive to adsorption...
April 14, 2018: Environmental Science and Pollution Research International
Grazyna Sakson, Agnieszka Brzezinska, Marek Zawilski
Heavy metals are among the priority pollutants which may have toxic effects on receiving water bodies. They are detected in most of samples of stormwater runoff, but the concentrations are very variable. This paper presents results of study on the amount of heavy metals discharged from urban catchment in Lodz (Poland) in 2011-2013. The research was carried out to identify the most important sources of their emission and to assess the threats to receiving water quality and opportunities of their limitation. The city is equipped with a combined sewerage in the center with 18 combined sewer overflows and with separate system in other parts...
April 14, 2018: Environmental Monitoring and Assessment
Naotaka Okamoto, Hiroshi Ueda, Takahiro Yoshimura, Surbhi Chamaria, Samit Bhatheja, Yuliya Vengrenyuk, Samaneh Rabiei, Yonandy Barrientos, Vishal Kapur, Nitin Barman, Joseph Sweeny, Usman Baber, Roxana Mehran, Samin K Sharma, Annapoorna S Kini
OBJECTIVES: The aim of the study was to compare the acute outcomes of Absorb bioresorbable vascular scaffolds (BVS) and second-generation drug-eluting stent (DES) implantation in routine clinical practice. There is a paucity of data regarding BVS use in a real-world patient population. METHODS: The study population comprised 40 consecutive patients who underwent percutaneous coronary intervention (PCI) with BVS implantation at a tertiary-care center in New York, New York between July and December of 2016...
April 15, 2018: Journal of Invasive Cardiology
Zuzana Grösslová, Aleš Vaněk, Vendula Oborná, Martin Mihaljevič, Vojtěch Ettler, Jakub Trubač, Petr Drahota, Vít Penížek, Lenka Pavlů, Ondra Sracek, Bohdan Kříbek, Andreas Voegelin, Jörg Göttlicher, Ondřej Drábek, Václav Tejnecký, Jakub Houška, Benjamin Mapani, Tereza Zádorová
We studied arid desert soils from Namibia (Rosh Pinah) that were contaminated with up to 7 mg kg-1 of thallium (Tl) via dust emitted from a local flotation tailing dam. Chemical extractions of waste and soil materials indicated that most of the Tl is strongly bound, in accordance with X-ray diffraction and X-ray absorption spectroscopy data that point to the predominant association of Tl with metal sulfides and phyllosilicates. The isotope fractionation factor ε205 Tl of the soil samples (from -0.4 to +3...
April 12, 2018: Environmental Pollution
Dattatray K Bedade, Rekha S Singhal
Acrylamide is neurotoxic, genotoxic, teratogenic and carcinogenic. Its widespread use in various industrial processes leads to environmental contamination. Acrylamidase produced by certain bacteria degrade acrylamide to acrylic acid and ammonia. The present study details the isolation and identification of soil bacterium which could degrade acrylamide. Among the 18 acrylamide-degrading isolates tested, isolate ICTDB921 demonstrated superior acrylamide degradation which was confirmed by HPLC, FTIR and GC-MS...
April 6, 2018: Bioresource Technology
Wiviane Kássia Oliveira Correia da Costa, Caroline Santos da Silva, José Fernando Dagnone Figueiredo, Joaquim Araujo Nóbrega, Ana Paula Silveira Paim
A fast and simple dilute-and-shoot procedure for determination of Al, As, Ba, Cd, Cu, Fe, Mg, Mn, Ni, Pb, Sc, Ti, V, Zn and Zr in deodorants by inductively coupled plasma optical emission spectrometry (ICP OES) was developed. Sample preparation was carried out by diluting 1 mL of deodorant sample in 1% (v v-1 ) HNO3 . The accuracy of the analytical procedure was evaluated using addition and recovery experiments, and recoveries ranged from 80 to 119%. The limits of detection varied from 0.001 to 0.76 mg kg-1 ...
April 5, 2018: Journal of Pharmaceutical and Biomedical Analysis
Lara R Malins
Transition-metal catalysis has unlocked new paradigms for the late-stage modification and cyclization of peptides by harnessing the innate reactivity of proteinogenic amino acids. The field is rapidly evolving, with recent advances encompassing three fundamental areas-heteroatom couplings, decarboxylative cross-couplings, and C-H functionalizations-which have markedly extended the scope of conventional peptide modification and bioconjugation strategies. The advances outlined herein facilitate access to high-value peptide targets with promising applications in materials science and drug discovery...
April 12, 2018: Current Opinion in Chemical Biology
Chu-Ya Wang, Xing Zhang, Qing Rong, Nan-Nan Hou, Han-Qing Yu
Ammonia (NH3 ), is a precursor for the formation of atmospheric fine particulate matter (PM2.5 ), and thus establishing efficient and cost-effective methods to detect ammonia emission is highly desired. Transition metal oxide semiconductors-based sensors for electrochemical gas sensing have been extensively explored. Among various types of semiconductors, tungsten oxide (WO3 ) possesses an anisotropic layered crystalline structure and is recognized as a promising material for gas sensing. However, the performance of commercial WO3 is unsatisfactory because of its high impedance and low charge transportation efficiency...
April 10, 2018: Chemosphere
Junzhe Dong, Junzhi Ye, Dessy Ariyanti, Yixuan Wang, Shanghai Wei, Wei Gao
The modification of titanium dioxide (TiO2 ) using noble metal nanoparticles is considered as a promising technique to make electrode with outstanding photocatalytic performance. In this paper, self-organized anodic TiO2 nanotube arrays were decorated with well-distributed small Cu nanoparticles through a novel technique that combines magnetron sputtering and thermal dewetting. The obtained nanocomposite catalyst exhibited 4-fold increase in the photodegradation rate of methylene blue aqueous solution under solar light irradiation than anatase TiO2 prepared with same anodization conditions...
April 9, 2018: Chemosphere
Atif Muhmood, Shubiao Wu, Jiaxin Lu, Zeeshan Ajmal, Hongzhen Luo, Renjie Dong
The aim of this study was to assess the potential of struvite precipitation to recover nutrients from anaerobically-processed poultry slurry and struvite's interactions with heavy metals (Zn, Cu, Pb, Cr, and Ni) and pathogens (total coliforms and Escherichia coli). The impacts of pH, Mg, N, and P molar proportion, reaction time, and mixing rate and duration were explored to determine the optimal conditions for nutrient recovery through struvite precipitation. A pH range of 9.5 to 10.5, was ideal for P and N removal and recovery, with a molar ratio of 1:1:1 for Mg:N:P...
April 12, 2018: Science of the Total Environment
Agnieszka Sobianowska-Turek
The utilization of the stream of waste secondary nickel-metal hydride (Ni-MH) and lithium-ion (Li-ion) cells, representing annually about 33% of all consumer batteries and accumulators placed on the Polish market, will soon become a big challenge for both legislators and plants dealing with the recycling of this type of hazardous waste. It is due to the fact that no company in Poland operating on the market has a complete technology for the processing of a full stream of waste chemical energy sources produced in this country...
April 11, 2018: Waste Management
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