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https://www.readbyqxmd.com/read/29778028/functional-lignocellulosic-material-for-the-remediation-of-copper-ii-ions-from-water-towards-the-design-of-a-wood-filter
#1
Selin Vitas, Tobias Keplinger, Nico Reichholf, Renato Figi, Etienne Cabane
In this study, the chemical modification of bulk beech wood is described along with its utilization as biosorbent for the remediation of copper from water. The material was prepared by esterification using anhydrides, and reaction conditions were optimized to propose a greener process, in particular by reducing the amount of solvent. This modification yields a lignocellulosic material whose native structure is preserved, with an increased amount of carboxylic groups (up to 3 mmol/g). We demonstrate that the material can remove up to 95% of copper from low concentration solutions (100- 500 ppm)...
May 9, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29775854/a-wavelength-modulated-localized-surface-plasmon-resonance-lspr-optical-fiber-sensor-for-sensitive-detection-of-mercury-ii-ion-by-gold-nanoparticles-dna-conjugates
#2
Shuo Jia, Chao Bian, Jizhou Sun, Jianhua Tong, Shanhong Xia
The study presented herein investigated an easy preparation, high performance, wavelength-modulated LSPR optical fiber chemosensor coated by gold nanospheres(AuNS) for Hg2+ detection based on thymine-Hg2+ -thymine base pair mismatches and the coupled plasmonic resonance effect.Utilizing electrostatic self-assembly method, the high density and dispersivity monolayer AuNS coated LSPR fiber sensor had the near field refractive index sensitivity up to 2016 nm/RIU. The single-strand probe DNA served as a binding element for free AuNS labelled-target DNA conjugates was attached to the monolayer AuNS by Au-S bond...
May 8, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29773376/converting-untreated-waste-office-paper-and-chitosan-into-aerogel-adsorbent-for-the-removal-of-heavy-metal-ions
#3
Zhanying Li, Lin Shao, Zehai Ruan, Wenbin Hu, Lingbin Lu, Yongjun Chen
The utilization of waste paper, an obsolete recyclable resource, helps to save resources and protect environment. In this paper, an aerogel was prepared to convert the waste paper into a useful material, which was used to adsorb heavy metal ions and handle water pollution. Combining waste office paper and chitosan, the aerogel obtained the enhanced mechanical strength, acid resistance and high adsorption capacity (up to 156.3 mg/g for Cu2+ ). This adsorption process obeyed the pseudo-second order model and the Langmuir model...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29773363/characterization-of-a-fluorescent-hydrogel-synthesized-using-chitosan-polyvinyl-alcohol-and-9-anthraldehyde-for-the-selective-detection-and-discrimination-of-trace-fe-3-and-fe-2-in-water-for-live-cell-imaging
#4
Santu Maity, Nira Parshi, Chandraday Prodhan, Keya Chaudhuri, Jhuma Ganguly
A three-dimensional fluorescent hydrogel based on chitosan, polyvinyl alcohol and 9-anthraldehyde (ChPA) has been successfully designed and synthesized for the selective detection and discrimination of Fe3+ and Fe2+ in aqueous environment. The unique characteristics of ChPA has been confirmed by the Fourier-transform infrared spectroscopy (FTIR), rheological measurement, scanning electron microscopy (SEM), thermogravimetry and differential thermogravimetry (TG-DTG), ultraviolet-visible spectroscopy (UV-vis), fluorescence studies, transmission electron microscopy (TEM), energy dispersive x-ray spectroscopy (EDX), x-ray diffraction (XRD) and dynamic light scattering (DLS)...
August 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29769600/x-ray-based-virtual-histology-allows-guided-sectioning-of-heavy-ion-stained-murine-lungs-for-histological-analysis
#5
Jonas Albers, M Andrea Markus, Frauke Alves, Christian Dullin
Examination of histological or immunohistochemically stained 2D sections of embedded tissue is one of the most frequently used tools in biomedical research and clinical routine. Since to date, targeted sectioning of specific regions of interest (ROI) in the sample is not possible, we aimed at developing a guided sectioning approach based on x-ray 3D virtual histology for heavy ion stained murine lung samples. For this purpose, we increased the contrast to noise ratio of a standard benchtop microCT by 5-10-fold using free-propagation phase contrast imaging and thus substantially improved image quality...
May 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29768888/effect-of-surfactants-on-the-structure-and-adsorption-efficiency-of-hydroxyapatite-nanorods
#6
Manisha Sharma, Amit Mishra, Akansha Mehta, Diptiman Choudhury, Soumen Basu
Porous hydroxyapatite (HAp) nanorods using surfactant templating proceeded via microwave irradiation method. Study of BET surface area measurement of the HAp nanorods showed that surface area of HAp nanorods with a mixture of cat-anionic surfactants was higher (56.16 m2/g) than their individual counterpart (for anionic 52.8 m2/g and for cationic 48.8 m2/g) as well as without surfactant (19.07 m2/g) due to higher synergistic effect and low critical aggregation concentration of the mixture. Surfactant-directed synthesis of porous HAp has been explored in literature, but the relation between the pore size distribution, surface area and morphology and choice of surfactant(s) was not fully understood and hence in this work we have explored those parameters...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29768874/nanocarriers-immobilized-proteases-and-their-industrial-applications-an-overview
#7
Qayyum Husain
The enzymes proteases have attracted a lot of attention due to their high demand in various industrial and other sectors since past several decades. Nanosupport bound proteases showed high efficiency of binding and yield of immobilization. Enzymes attached to such support were found significantly more resistant to the denaturation mediated by change in pH and temperature, medium particularly in the presence of water miscible and immiscible organic solvents, detergents, and several kinds of other denaturants...
January 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29763287/insight-studies-on-metal-organic-framework-nanofibrous-membrane-adsorption-and-activation-for-heavy-metal-ions-removal-from-aqueous-solution
#8
Johnson Efome, Dipak Rana, Takeshi Matsuura, Christopher Q Lan
Electrospun nanofiber composite membranes containing water stable metal-organic frameworks (MOFs) particles (Zr-based MOF-808) supported on polyacrylonitrile (PAN) nanofiber synthesized via co-electrospinning have been prepared. MOF particles were dispersed in the organic polymer and their subsequent presence was inferred by SEM. Membrane performance in heavy metal ion adsorption in batch filtration was evaluated based on Cd2+ and Zn2+ ions sequestration. The adsorption capacities of the pristine MOF and the MOF composite membrane revealed that MOF particles in the membrane could be accessed for adsorption in the hydrophilic PAN membranes...
May 15, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29762494/a-facile-electrochemical-sensor-based-on-pyts%C3%A2-cnts-for-simultaneous-determination-of-cadmium-and-lead-ions
#9
Ruyuan Jiang, Niantao Liu, Sanshuang Gao, Xamxikamar Mamat, Yuhong Su, Thomas Wagberg, Yongtao Li, Xun Hu, Guangzhi Hu
A simple and easy method was implemented for the contemporary detection of cadmium (Cd2+ ) and lead (Pb2+ ) ions using 1,3,6,8-pyrenetetrasulfonic acid sodium salt-functionalized carbon nanotubes nanocomposites (PyTS⁻CNTs). The morphology and composition of the obtained PyTS⁻CNTs were characterized using scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and X-ray photoelectron spectroscopy (XPS). The experimental results confirmed that the fabricated PyTS⁻CNTs exhibited good selectivity and sensitivity for metal ion-sensing owing to the insertion of sulfonic acid groups...
May 15, 2018: Sensors
https://www.readbyqxmd.com/read/29758867/stable-sulfur-isotope-ratios-and-chemical-compositions-of-fine-aerosols-pm-2-5-in-beijing-china
#10
Lianfang Wei, Siyao Yue, Wanyu Zhao, Wenyi Yang, Yingjie Zhang, Lujie Ren, Xiaokun Han, Qingjun Guo, Yele Sun, Zifa Wang, Pingqing Fu
Pervasive particulate pollution has been observed over large areas of the North China Plain. The high level of sulfate, a major component in fine particles, is pronounced during heavy pollution periods. Being different from source apportionments by atmospheric chemistry-transport model and receptor modeling methods, here we utilize sulfur isotopes to discern the potential emission sources. Sixty-five daily PM2.5 samples were collected at an urban site in Beijing between September 2013 and July 2014. Inorganic ions, organic/elemental carbon and stable sulfur isotopes of sulfate were analyzed...
August 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29756181/morphology-tunable-tellurium-nanomaterials-produced-by-the-tellurite-reducing-bacterium-lysinibacillus-sp-zym-1
#11
Zhiwei Wang, Yibin Bu, Yonghe Zhao, Zuotai Zhang, Lifen Liu, Hao Zhou
Although tellurite is highly toxic to organisms, elemental tellurium nanomaterials (TeNMs) have many uses. The microbe-mediated reduction of tellurite to Te(0) has been shown to be a green and cost-effective approach for turning waste into wealth. However, it is difficult to tune the morphology of biogenic nanomaterials. In this study, a series of experiments was conducted to investigate the factors influencing tellurite reduction by the tellurite-reducing bacterium Lysinibacillus sp. ZYM-1, including pH, tellurite concentration, temperature, and heavy metal ions...
May 13, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29755805/analysis-of-bacterial-diversity-in-different-heavy-oil-wells-of-a-reservoir-in-south-oman-with-alkaline-ph
#12
Biji Shibulal, Saif N Al-Bahry, Yahya M Al-Wahaibi, Abdulkadir E Elshafie, Ali S Al-Bemani, Sanket J Joshi
The identification of potential hydrocarbon utilizing bacteria is an essential requirement in microbial enhanced oil recovery (MEOR). Molecular approaches like proteomic and genomic characterization of the isolates are replacing the traditional method of identification with systemic classification. Genotypic profiling of the isolates includes fingerprint or pattern-based technique and sequence-based technique. Understanding community structure and dynamics is essential for studying diversity profiles and is challenging in the case of microbial analysis...
2018: Scientifica
https://www.readbyqxmd.com/read/29754298/characterization-of-extracellular-polysaccharide-protein-contents-during-the-adsorption-of-cd-ii-by-synechocystis-sp-pcc6803
#13
Li Shen, Zhanfei Li, Junjun Wang, Ajuan Liu, Zhenhua Li, Runlan Yu, Xueling Wu, Yuandong Liu, Jiaokun Li, Weimin Zeng
Cyanobacteria have been proven to be cheaper and more effective for the removal of metallic elements in aqueous solutions. In this study, the living cyanobacteria Synechocystis sp. PCC6803 was used to adsorb Cd(II) and its extracellular polymeric substances (EPS) were investigated in the adsorption process. The initial stage of adsorption of Cd(II) was a rapid process, and then increase slowly accompanied with the increases of biomass. The final adsorption percentage could achieve 86% when the Cd(II) concentration was 0...
May 12, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29753417/persistent-depletion-of-plasma-gelsolin-pgsn-after-exposure-of-mice-to-heavy-silicon-ions
#14
Kanokporn Noy Rithidech, Paiboon Reungpatthanaphong, Montree Tungjai, Witawat Jangiam, Louise Honikel, Elbert B Whorton
Little is known about plasma proteins that can be used as biomarkers for early and late responses to radiation. The purpose of this study was to determine a link between depletion of plasma gelsolin (pGSN) and cell-death as well as inflammatory responses in the lung (one of the tissues known to be radiosensitive) of the same exposed CBA/CaJ mice after exposure to heavy silicon (28 Si) ions. To prevent the development of multiple organ dysfunctions, pGSN (an important component of the extracellular actin-scavenging system) is responsible for the removal of actin that is released into the circulation during inflammation and from dying cells...
May 2018: Life Sciences in Space Research
https://www.readbyqxmd.com/read/29751498/fast-potentiometric-analysis-of-lead-in-aqueous-medium-under-competitive-conditions-using-an-acridono-crown-ether-neutral-ionophore
#15
Ádám Golcs, Viola Horváth, Péter Huszthy, Tünde Tóth
Lead is a particularly toxic heavy metal that is present above acceptable levels in the water of many countries. This article describes a quick detection method of lead(II) ions using a polyvinyl chloride (PVC)-based ion-selective membrane electrode containing an acridono-crown ether ionophore by potentiometry. The electrochemical cell exhibits a Nernstian response for lead(II) ions between the concentration range of 10−4 to 10−2 M, and can be used in the pH range of 4⁻7. The applicability of this sensor was verified by measuring a multicomponent aqueous sample...
May 3, 2018: Sensors
https://www.readbyqxmd.com/read/29747464/discriminating-between-different-heavy-metal-ions-with-fullerene-derived-nanoparticles
#16
Erica Ciotta, Paolo Prosposito, Pietro Tagliatesta, Chiara Lorecchio, Lorenzo Stella, Saulius Kaciulis, Peiman Soltani, Ernesto Placidi, Roberto Pizzoferrato
A novel type of graphene-like nanoparticle, synthesized by oxidation and unfolding of C60 buckminsterfullerene fullerene, showed multiple and reproducible sensitivity to Cu2+ , Pb2+ , Cd2+ , and As(III) through different degrees of fluorescence quenching or, in the case of Cd2+ , through a remarkable fluorescence enhancement. Most importantly, only for Cu2+ and Pb2+ , the fluorescence intensity variations came with distinct modifications of the optical absorption spectrum. Time-resolved fluorescence study confirmed that the common origin of these diverse behaviors lies in complexation of the metal ions by fullerene-derived carbon layers, even though further studies are required for a complete explanation of the involved processes...
May 10, 2018: Sensors
https://www.readbyqxmd.com/read/29745158/-effects-of-elevated-cd-zn-and-their-combined-effects-on-antioxidant-system-of-tobacco
#17
Wei Yang, Hong Yan Wang, Kai Yuan Yu, Hong Lou, Guang Si Ji, Ya Nan Ruan
A solution culture was conducted to study the effects of elevated Cd and/or Zn ions (0.1 mmol·L-1 Cd2+ , 0.15 mmol·L-1 Zn2+ , 0.1 mmol·L-1 Cd2+ +0.15 mmol·L-1 Zn2+ ) on seed germination rate and reactive oxygen species (ROS) level, antioxidants contents, antioxidant enzyme activities and product of membrane lipid peroxidation in tobacco seedling leaves. The results showed that compared to control, the seed germination rate decreased under elevated level of Cd2+ or Zn2+ , the superoxide radical (O2 -· ) generation rate and hydrogen peroxide (H2 O2 ) content in tobacco seedlings increased, the activities of catalase (CAT), ascorbate peroxidase (APX), dehydroascorbate reductase (DHAR), monodehydroascorbate reductase (MDAR), and glutathione reductase (GR) increased, content of glutathione (GSH) and GSH/GSSG (oxidized glutathione) ratio decreased, and malondialdehyde (MDA) content increased...
June 18, 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
https://www.readbyqxmd.com/read/29744780/tracking-metal-ions-with-polypyrrole-thin-films-adhesively-bonded-to-diazonium-modified-flexible-ito-electrodes
#18
Momath Lo, Abdou K D Diaw, Diariatou Gningue-Sall, Jean-Jacques Aaron, Mehmet A Oturan, Mohamed M Chehimi
Adhesively bonded polypyrrole thin films doped with benzene sulfonic acid (BSA) were electrodeposited on aminobenzenediazonium-modified flexible ITO electrodes and further employed for the detection of Pb2+ , Cu2+ , and Cd2+ metal ions in aqueous medium. The aminophenyl (AP) adhesive layer was grafted to ITO by electroreduction of the in situ generated parent diazonium compound. Polypyrrole (PPy) thin films exhibited remarkable adhesion to aminophenyl (ITO-AP). The strongly adherent polypyrrole films exhibited excellent electroactivity in the doped state with BSA which itself served to chelate the metal ions in aqueous medium...
May 9, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29742476/competitive-adsorption-of-cd-2-pb-2-and-ni-2-onto-fe-3-modified-argillaceous-limestone-influence-of-ph-ionic-strength-and-natural-organic-matters
#19
Shuran He, Yongtao Li, Liping Weng, Jinjin Wang, Jinxian He, Yonglin Liu, Kun Zhang, Qihong Wu, Yulong Zhang, Zhen Zhang
In present study, the feasibility of applying a natural adsorbent with Fe3+ modification (Fe3+ -modified argillaceous limestone, FAL) on the competitive adsorption of heavy metals (i.e., Cd2+ , Pb2+ and Ni2+ ) was evaluated. The current results revealed an efficient adsorption on Cd2+ , Pb2+ and Ni2+ in mono-metal system. Further experiments demonstrated a high selectivity of Pb2+ during the competitive adsorption of Cd2+ , Pb2+ and Ni2+ . The adsorption selectivity of the metal ions followed the order of Pb ≫ Cd > Ni...
May 6, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29739417/evaluation-of-particle-radiotherapy-for-the-re-irradiation-of-recurrent-intracranial-meningioma
#20
Rami A El Shafie, Maja Czech, Kerstin A Kessel, Daniel Habermehl, Dorothea Weber, Stefan Rieken, Nina Bougatf, Oliver Jäkel, Jürgen Debus, Stephanie E Combs
BACKGROUND: With the advance of modern irradiation techniques, the role of radiotherapy (RT) for intracranial meningioma has increased significantly throughout the past years. Despite that tumor's generally favorable outcome with local control rates of up to 90% after ten years, progression after RT does occur. In those cases, re-irradiation is often difficult due to the limited radiation tolerance of the surrounding tissue. The aim of this analysis is to determine the value of particle therapy with its better dose conformity and higher biological efficacy for re-irradiating recurrent intracranial meningioma...
May 8, 2018: Radiation Oncology
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