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heavy ion

Xiangmeng Qu, Fan Yang, Hong Chen, Jiang Li, Hongbo Zhang, Guo-Jun Zhang, Li Li, Lihua Wang, Shiping Song, Yang Tian, Hao Pei
The development of rapid and sensitive point-of-test devices for the on-site monitoring of heavy-metal contamination has great scientific and technological importance. However, developing fast, inexpensive, and sensitive microarray sensors to achieve such goal remains challenging. In this work, we present a DNA nanostructured microarray (DNM) with tubular three-dimensional (3D) sensing surface and ordered nanotopography. This microarray enables enhanced molecular interaction toward the rapid and sensitive multiplex detection of heavy-metal ions...
April 21, 2017: ACS Applied Materials & Interfaces
Yoon-Ha Kim, Abdul L Khan, Muhammad Waqas, In-Jung Lee
Silicon (Si) is the second most abundant element in soil, where its availability to plants can exhilarate to 10% of total dry weight of the plant. Si accumulation/transport occurs in the upward direction, and has been identified in several crop plants. Si application has been known to ameliorate plant growth and development during normal and stressful conditions over past two-decades. During abiotic (salinity, drought, thermal, and heavy metal etc) stress, one of the immediate responses by plant is the generation of reactive oxygen species (ROS), such as singlet oxygen ((1)O2), superoxide ([Formula: see text]), hydrogen peroxide (H2O2), and hydroxyl radicals (OH), which cause severe damage to the cell structure, organelles, and functions...
2017: Frontiers in Plant Science
Lei Wang, Xinhua Zhao, Jinmiao Zhang, Zhenhu Xiong
Two series of metal-organic frameworks (MOFs) with similar formula units but different central metal ions (M) or organic linkers (L), M-BDC (BDC = terephthalate, M = Zn, Zr, Cr, or Fe), or Zn-L (L = imidazolate-2-methyl, BDC, BDC-NH2), were prepared and employed as the receptors for adsorption lead ions. It was found that the Zn-BDC exhibited a much higher adsorption capacity than the other M-BDC series with various metal ions which have very closely low capacities at same conditions. Furthermore, the Zn-L (L = imidazolate-2-methyl, BDC, BDC-NH2) still have highly efficient adsorption capacity of lead ions, although the adsorption capacity varies with different ligand, as well as the adsorption rate and the equilibrium pH of the solution...
April 18, 2017: Environmental Science and Pollution Research International
Omid Tavakoli, Vahabodin Goodarzi, Mohammad Reza Saeb, Niyaz Mohammad Mahmoodi, Rafael Borja
Heavy metal ions (HMIs) are serious threats to the environment. Sub-critical water treatment was used to mimic contamination of squid oil in aqueous, metal-soap and oil phases. Isothermal adsorption of HMIs (Cu(2+), Pb(2+), Cd(2+) and Zn(2+)) was studied from aqueous phase to oil phase (493, 523, 548, and 573K) for solutions with different initial concentration of HMIs was studied. Decomposition of glycerides into fatty acids was favored at high subcritical temperatures, with metal-soap phase showing the highest chelation ability toward Cu(2+) (96%, isotherm 573K)...
April 7, 2017: Journal of Hazardous Materials
Gabriel S Vignoli Muniz, Christian F Mejía, Rafael Martinez, Basile Auge, Hermann Rothard, Alicja Domaracka, Philippe Boduch
The presence of nucleobases in carbonaceous meteorites on Earth is an indication of the existence of this class of molecules in outer space. However, space is permeated by ionizing radiation, which can have damaging effects on these molecules. Adenine is a purine nucleobase that amalgamates important biomolecules such as DNA, RNA, and ATP. Adenine has a unique importance in biochemistry and therefore life. The aim of this work was to study the effects of cosmic ray analogues on solid adenine and estimate its survival when exposed to corpuscular radiation...
April 2017: Astrobiology
Shintaro Mandai, Susumu Furukawa, Manami Kodaka, Yutaka Hata, Takayasu Mori, Naohiro Nomura, Fumiaki Ando, Yutaro Mori, Daiei Takahashi, Yuki Yoshizaki, Yuri Kasagi, Yohei Arai, Emi Sasaki, Sayaka Yoshida, Yasuro Furuichi, Nobuharu L Fujii, Eisei Sohara, Tatemitsu Rai, Shinichi Uchida
Muscle wasting or sarcopenia contributes to morbidity and mortality in patients with cancer, renal failure, or heart failure, and in elderly individuals. Na(+)-K(+)-2Cl(-) cotransporter 1 (NKCC1) is highly expressed in mammalian skeletal muscle, where it contributes to the generation of membrane ion currents and potential. However, the physiologic function of NKCC1 in myogenesis is unclear. We investigated this issue using the NKCC1 inhibitors bumetanide and furosemide, which are commonly used loop diuretics...
April 18, 2017: Scientific Reports
Mohammad Tariqur Rahman, Nazmul Haque, Noor Hayaty Abu Kasim, Marc De Ley
Toxic heavy metals, toxic organic compounds, reactive oxygen species (ROS), infections, and temperature are well-known metallothionein (MT) inducers in human blood. The current review aims to summarize synthesis, function, and fate of human blood MT in response to the known MT inducers. Part of the MTs that are synthesized in different organs such as the liver, kidney, and spleen is transported and stored in different blood cells and in plasma. Cells of the circulatory system also synthesize MT. From the circulation, MT returns to the kidney where the metal-bound MTs are degraded to release the metal ion that in turn induces MT expression therein...
April 18, 2017: Reviews of Physiology, Biochemistry and Pharmacology
Eduardo A López-Maldonado, Oscar Gabriel Zavala García, Kevin Cruz Escobedo, Mercedes T Oropeza-Guzman
In this paper nonstoichiometric interbiopolyelectrolyte green complexes (NIBPEGCs) were prepared using chitosan (Ch), alginate (AG) and poly(acrylic acid)(PAA). They are proposed as innovative formulations (polyelectrolytes and chelating agents) suitable for the elimination heavy metals contained in wastewater. This application may represent an integral solution for industries rejecting solid and aqueous metallic materials; however, it has not been previously reported. NIBPEGCs physicochemical performance was evaluated based on pH, particle size, surface charge, isoelectric point, dose, coagulation-flocculation kinetics and chemical affinity with seven metal ions...
April 7, 2017: Journal of Hazardous Materials
Maristella Maggi, Claudia Scotti
Heterologous expression of high amounts of recombinant proteins is a milestone for research and industrial purposes. Single domain antibodies (sdAbs) are heavy-chain only antibody fragments with applications in the biotechnological, medical and industrial fields. The simple nature and small size of sdAbs allows for efficient expression of the soluble molecule in different hosts. However, in some cases, it results in low functional protein yield. To overcome this limitation, expression of a 6xHistag sdAb was attempted in different conditions in Escherichia coli BL21(DE3) cells...
June 2017: Data in Brief
Filippo Frizzi, Alberto Masoni, Mine Çelikkol, Enrico Palchetti, Claudio Ciofi, Guido Chelazzi, Giacomo Santini
Natural habitats with serpentine soils are rich in heavy metal ions, which may significantly affect ecological communities. Exposure to metal pollutants results, for instance, in a reduction of population genetic diversity and a diffused higher tolerance towards heavy metals. In this study, we investigated whether chronic exposure to metals in serpentine soils affect accumulation patterns, tolerance towards metal pollutants, and genetic diversity in ants. In particular, we studied colonies of the common Mediterranean ant, Crematogaster scutellaris, along a contamination gradient consisting of two differently contaminated forests and a reference soil with no geogenic contamination...
April 10, 2017: Chemosphere
Beata Janowska, Kazimierz Szymański, Robert Sidełko, Izabela Siebielska, Bartosz Walendzik
Content of heavy metals, including mercury, determines the method of management and disposal of sewage sludge. Excessive concentration of mercury in composts used as organic fertilizer may lead to accumulation of this element in soil and plant material. Fractionation of mercury in sewage sludge and composts provides a better understanding of the extent of mobility and bioavailability of the different mercury species and helps in more informed decision making on the application of sludge for agricultural purposes...
April 10, 2017: Environmental Research
Rukshan Perera, Syed Ashraf, Anja Mueller
Imprinting polymerization is a flexible method to make resins specific for different compounds. Imprinting polymerization involves the polymerization of the resin in the presence of a template, here cadmium ions or arsenate. The template is then removed by washing, leaving specific binding sites in the resin. In water treatment, the removal of toxic metal ions is difficult due to the limited affinity of these ions to ion exchange resins. Imprinting polymerization of ion-exchange resins is used to develop resins with high capacity and some selectivity for cadmium ions or arsenate for water treatment that still function as general ion-exchange resins...
April 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Emad M Elsehly, N G Chechenin, A V Makunin, H A Motaweh, E G Leksina
This investigation examines the filtration efficiency of chromium from aqueous solution using two types of commercial multiwalled carbon nanotubes (MWCNTs) (Taunit-M (TM) and Taunit-MD (TMD)). These MWCNTs were modified using two complementary treatments, purification (using a mixture of hydrochloric acid and hydrogen peroxide) and functionalization (using nitric acid). The effect of these treatments on the morphology of MWCNT Taunit filters was characterized by scanning electron microscopy and energy dispersive X-ray spectroscopy to estimate the outer diameter distribution and element content deposited on filters...
April 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Fyodor S Kot, Kunio Fujiwara, Malik Kochva
A simple and effective procedure was developed for the simultaneous in situ preconcentration of major and minor alkali and alkaline-earth metals (Li, Na, K, Rb, Mg, Ca, Sr, and Ba) from natural waters with iminodiacetate-grafted fiber (IDA-fiber), using soil water extracts as an example. The method was verified on mixed standard solutions of the metals at concentrations and ionic strengths reported for regular soil solutions. When complemented with routine microfiltration procedures, the method could distinguish between the dissolved in hydrated ion form and bound fractions of these metals, presumably colloidal and firmly complexed...
April 10, 2017: Analytical and Bioanalytical Chemistry
Oliver Plümper, Helen E King, Thorsten Geisler, Yang Liu, Sonja Pabst, Ivan P Savov, Detlef Rost, Thomas Zack
Serpentinization-fueled systems in the cool, hydrated forearc mantle of subduction zones may provide an environment that supports deep chemolithoautotrophic life. Here, we examine serpentinite clasts expelled from mud volcanoes above the Izu-Bonin-Mariana subduction zone forearc (Pacific Ocean) that contain complex organic matter and nanosized Ni-Fe alloys. Using time-of-flight secondary ion mass spectrometry and Raman spectroscopy, we determined that the organic matter consists of a mixture of aliphatic and aromatic compounds and functional groups such as amides...
April 10, 2017: Proceedings of the National Academy of Sciences of the United States of America
Lei Shi, Yangyang Li, Xiaojiao Rong, Yan Wang, Shiming Ding
In this work, a novel 3D graphene framework/Bi nanoparticle (GF/BiNP) film was fabricated with a facile preparation route. 3D graphene framework with porous structures was electrochemically reduced and in situ assembled on the electrode, and BiNPs with tunable morphologies were highly dispersed on the framework by a chemical reduction. Newly-designed 3D GF/BiNP film possessed a significantly large active area, fast electron transfer ability, high mass transfer efficiency, and excellent structure stability and binding strength on electrode...
May 22, 2017: Analytica Chimica Acta
Keila Martín-Betancor, Sonia Aguado, Ismael Rodea-Palomares, Miguel Tamayo-Belda, Francisco Leganés, Roberto Rosal, Francisca Fernández-Piñas
In the present study, the biocidal activity of three different metal organic frameworks (MOFs) based on Co (Co-SIM1), Zn (Zn-SIM1) and Ag (Ag-TAZ) has been evaluated towards one green alga and two cyanobacteria. These organisms are present in fresh- and seawater and take part in the early stages of the biofouling process. The biocidal activity of these materials was evaluated by measuring chlorophyll a concentration and by inhibition zone testing. After 24h of exposure the three different MOFs caused >50% of chlorophyll a concentration inhibition towards both cyanobacteria, however, although the green alga presented a great sensitivity for Ag-TAZ (reaching 90% of chlorophyll a concentration inhibition), it was much more resistant to the rest of MOFs...
April 7, 2017: Science of the Total Environment
Qianwen Sun, Jikui Wang, Meihua Tang, Liming Huang, Zhiyi Zhang, Chang Liu, Xiaohua Lu, Kenneth W Hunter, Guosong Chen
Here we describe a new and sensitive flow electrochemical detection system that employs a novel flow-field shaped solid electrode (FFSSE). The system was constructed with a 3D-printed thin-layer flow cell (TLFC) and a flat screen-printed FFSSE with USB connection. This interface facilitates continuous flow accumulation square-wave anodic stripping voltammetry (ASV). The flow distribution in the working space of TLFC was simulated using the finite element method (FEM) and the shape and configuration of electrodes were optimized accordingly...
April 13, 2017: Analytical Chemistry
Azhar Abbas, Muhammad Ajaz Hussain, Muhammad Sher, Muhammad Imran Irfan, Muhammad Nawaz Tahir, Wolfgang Tremel, Syed Zajif Hussain, Irshad Hussain
Hydroxyethylcellulose succinate-Na (HEC-Suc-Na) was designed and evaluated for removal of some heavy metal ions from aqueous solution. Pristine sorbent HEC-Suc-Na was thoroughly characterized by FTIR and solid-state CP/MAS (13)C NMR spectroscopy, SEM-EDS and zero point charge analyses. Langmuir isotherm, pseudo second order kinetic and ion exchange models provided best fit to the experimental data of sorption of metal ions. Maximum sorption capacities of supersorbent HEC-Suc-Na for sorption of heavy metal ions from aqueous solution as calculated by Langmuir isotherm model were found to be 1000, 909...
April 7, 2017: International Journal of Biological Macromolecules
Mohamed Esmat, Ahmed A Farghali, Mohamed H Khedr, Ibrahim M El-Sherbiny
Cobalt ferrite nanoparticles (CF), titanate nanotubes (T), alginate (G) and their nanocomposite microparticles (CF/G and T/G) were prepared and used for efficient removal of Cu(2+), Fe(3+) and As(3+) ions from water. The nanocomposites were characterized using field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), FTIR and vibrating sample magnetometer (VSM). In addition, the effects of pH, contact time, adsorbent weight and heavy metal ion concentration on the removal efficiency were investigated...
April 7, 2017: International Journal of Biological Macromolecules
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