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https://www.readbyqxmd.com/read/28212011/a-fluorescent-anionic-mof-with-zn4-trz-2-chain-for-highly-selective-visual-sensing-of-contaminants-cr-iii-ion-and-tnp
#1
Xiao-Xia Jia, Ru-Xin Yao, Fu-Qiang Zhang, Xian-Ming Zhang
Heavy-metal ions and nitroaromatic substances are highly toxic and harmful to human health and the ecological environment. It is an urgent issue to selectively detect and capture these toxic substances. By introducing the triazole ligand to the π-conjugated aromatic carboxylate system and borrowing the organic template open framework idea, a stable fluorescent framework [Me2NH2]4[Zn6(qptc)3(trz)4]·6H2O (1) (H4qptc = terphenyl-2,5,2'5'-tetracarboxylic acid, trz = 1,2,4-triazole) has been successfully synthesized, which features Zn4(trz)2 chain-based 3D anionic structure with channels filled by [Me2NH2](+) cations...
February 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28211330/biosorption-and-biomineralization-of-uranium-vi-by-saccharomyces-cerevisiae-crystal-formation-of-chernikovite
#2
Xin-Yan Zheng, Xiao-Yu Wang, Yang-Hao Shen, Xia Lu, Tie-Shan Wang
Biosorption of heavy metal elements including radionuclides by microorganisms is a promising and effective method for the remediation of the contaminated places. The responses of live Saccharomyces cerevisiae in the toxic uranium solutions during the biosorption process and the mechanism of uranium biomineralization by cells were investigated in the present study. A novel experimental phenomenon that uranium concentrations have negative correlation with pH values and positive correlation with phosphate concentrations in the supernatant was observed, indicating that hydrogen ions, phosphate ions and uranyl ions were involved in the chernikovite precipitation actively...
February 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28206820/tolerance-to-x-rays-and-heavy-ions-fe-he-in-the-tardigrade-richtersius-coronifer-and-the-bdelloid-rotifer-mniobia-russeola
#3
K Ingemar Jönsson, Andrzej Wojcik
The aim of this study was to analyze tolerance to heavy ions in desiccated animals of the eutardigrade Richtersius coronifer and the bdelloid rotifer Mniobia russeola within the STARLIFE project. Both species were exposed to iron (Fe) and helium (He) ions at the Heavy Ion Medical Accelerator in Chiba (HIMAC) in Chiba, Japan, and to X-rays at the German Aerospace Center (DLR) in Cologne, Germany. Results show no effect of Fe and He on viability up to 7 days post-rehydration in both R. coronifer and M. russeola, while X-rays tended to reduce viability in R...
February 2017: Astrobiology
https://www.readbyqxmd.com/read/28205434/recent-advances-on-magnetic-relaxation-switching-assay-based-nanosensors
#4
Yang Zhang, Hong Yang, Zhiguo Zhou, Kai Huang, Shi-Ping Yang, Gang Han
Magnetic relaxation switching assay (MRSw)-based nanosensors respond to the changes of transverse relaxation time (T2) of water molecules resulted from the analyte-induced aggregation / disaggregation of magnetic nanoparticles (MNPs). This strategy has been widely applied to the detections of various substrates from heavy metal ions to organic pollutants, proteins, nucleic acids, bacteria/viruses, and specific cells. Compared with other nanosensors, MRSw-based nanosensors not only are free from the background interferences, signal bleaching, and quenching but also overcome light scattering from samples without pre-treatments...
February 16, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28197416/evaluation-of-metal-ion-concentration-in-hard-tissues-of-teeth-in-residents-of-central-poland
#5
Piotr Wychowanski, Konrad Malkiewicz
Objectives. The aim of the study was an assessment of the content of trace elements in enamel and dentin of teeth extracted in patients residing in urban and agricultural areas of Poland. Methods. The study included 30 generally healthy patients with retained third molars. 65 samples of enamel and dentin from individuals living in urban areas and 85 samples of enamel and dentin from individuals living in agricultural areas were prepared. The content of manganese, lead, cadmium, and chromium in the studied enamel and dentin samples from retained teeth was determined by Graphite Furnace Atomic Absorption Spectrometry...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28193002/organic-cyanide-decorated-sers-active-nanopipettes-for-quantitative-detection-of-hemeproteins-and-fe-3-in-single-cells
#6
Sumaira Hanif, Hailing Liu, Ming Chen, Pir Muhammad, Yue Zhou, Jiao Cao, Saud Asif Ahmed, Jingjuan Xu, Xinghua Xia, Hongyuan Chen, Kang Wang
It is challenging to develop a robust nanoprobe for real-time operational and accurate detection of heavy metals in single cells. Fe-CN coordination chemistry has been well studied to determine the structural characteristics of hemeproteins by different techniques. However, the frequently used cyanide ligands are inorganic molecules that release cyanide anion under particular conditions and cause cyanide poisoning. In the present study, organic cyanide (4-mercaptobenzonitrile, MBN) was utilized for the first time in developing a facile nanoprobe based on surface-enhanced Raman scattering (SERS) for quantitative detection of hemeproteins (oxy-Hb) and trivalent iron (Fe(3+)) ions...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28192903/tin-oxide-crystals-exposed-by-low-energy-110-facets-for-enhanced-electrochemical-heavy-metal-ions-sensing-x-ray-absorption-fine-structure-experimental-combined-with-density-functional-theory-evidence
#7
Zhen Jin, Meng Yang, Shao-Hua Chen, Jin-Huai Liu, Qun-Xiang Li, Xing-Jiu Huang
Herein, we revealed that the electrochemical behaviors on the detection of heavy metal ions (HMIs) would largely rely on the exposed facets of SnO2 nanoparticles. Compared to the high-energy {221} facet, the low-energy {110} facet of SnO2 possessed better electrochemical performance. The adsorption/desorption tests, density-functional theory (DFT) calculations, and X-ray absorption fine structure (XAFS) studies showed that the lower barrier energy of surface diffusion on {110} facet was critical for the superior electrochemical property, which was favorable for the ions diffusion on the electrode, and further leading the enhanced electrochemical performance...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28192353/removal-of-ammonium-and-heavy-metals-by-cost-effective-zeolite-synthesized-from-waste-quartz-sand-and-calcium-fluoride-sludge
#8
Qian Zhang, Bing Lin, Junming Hong, Chang-Tang Chang
This study focuses on the effectiveness of zeolite (10% CF-Z [0.5]) hydrothermally synthesized from waste quartz sand and calcium fluoride (CF) for ammonium ion and heavy metal removal. Zeolite was characterized through powder X-ray diffraction, Fourier-transform infrared spectroscopy, micromeritics N2 adsorption/desorption analysis, and field emission scanning electron microscopy. The effects of CF addition, Si/Al ratio, initial ammonium concentration, solution pH, and temperature on the adsorption of ammonium on 10% CF-Z (0...
February 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28183656/facile-synthesis-of-carbon-dot-and-residual-carbon-nanobeads-implications-for-ion-sensing-medicinal-and-biological-applications
#9
Rohit Ranganathan Gaddam, Sudip Mukherjee, Neelambaram Punugupati, D Vasudevan, Chitta Ranjan Patra, Ramanuj Narayan, Raju Vsn Kothapalli
Synthesis of carbon dots (Cdots) via chemical route involves disintegration of carbon materials into nano-domains, wherein, after extraction of Cdots, the remaining carbon material is discarded. The present work focuses on studying even the leftover carbon residue namely, carbon nanobeads (CNBs) as an equally important material for applications on par with that of carbon dot. It employs oxidative treatment of carbonised gum olibanum resin (GOR) to produce the carbons namely Cdots and CNBs (as the residue). The Cdots (~5-10nm) exhibit blue-green fluorescence with an optical absorption at ~300nm unlike the CNBs (40-50nm) which fail to exhibit fluorescence...
April 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28164784/accumulation-and-tolerance-to-cadmium-heavy-metal-ions-and-induction-of-14-3-3-gene-expression-in-response-to-cadmium-exposure-in-coprinus-atramentarius
#10
Chengjian Xie, Liujie Hu, Yongzhu Yang, Dunxiu Liao, Xingyong Yang
Cadmium (Cd), one of the most toxic heavy-metal pollutants, has a strong and irreversible tendency to accumulate. Bioremediation is a promising technology to remedy and control heavy metal pollutants because of its low cost and ability to recycle heavy metals. Coprinus atramentarius is recognized as being able to accumulate heavy metal ions. In this work, C. atramentarius is cultivated on a solid medium containing Cd(2+) ions to analyze its ability to tolerate different concentrations of the heavy metal ion...
March 2017: Microbiological Research
https://www.readbyqxmd.com/read/28161502/removal-of-cadmium-and-lead-ions-from-water-by-sulfonated-magnetic-nanoparticle-adsorbents
#11
Kai Chen, Junyong He, Yulian Li, Xingguo Cai, Kaisheng Zhang, Tao Liu, Yi Hu, Dongyue Lin, Lingtao Kong, Jinhuai Liu
A new adsorbent, Fe3O4 sulfonated magnetic nanoparticle (Fe3O4-SO3H MNP), was developed for heavy metal ions removal from water, which could be effectively separated from the solution owing to the superparamagnetic property. The nanoparticles can be used to remove heavy metal ions due to the additional active site, "sulfo-group", introduced by the AMPS branches grafted onto the iron oxide. The as-synthesized materials were characterized by SEM, TEM, FT-IR and BET. The FTIR, XPS and Zeta potential were used to describe the adsorption mechanism...
January 24, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28161478/identification-of-tg100-115-as-a-new-and-potent-trpm7-kinase-inhibitor-which-suppresses-breast-cancer-cell-migration-and-invasion
#12
Chiman Song, Yeonju Bae, JinJoo Jun, Hyomin Lee, Nam Doo Kim, Kyung-Bok Lee, Wooyoung Hur, Jae-Yong Park, Taebo Sim
BACKGROUND: Transient receptor potential melastatin 7 (TRPM7) regulates breast cancer cell proliferation, migration, invasion and metastasis in its ion channel- and kinase domain-dependent manner. The pharmacological effects of TRPM7 ion channel inhibitors on breast cancer cells have been studied, but little is known about the effects of TRPM7 kinase domain inhibitors due to lack of potent TRPM7 kinase inhibitors. METHODS: Screening was performed by using TRPM7 kinase assay...
February 1, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28158934/inducibility-of-ventricular-arrhythmia-1-year-following-treatment-with-heavy-ion-irradiation-in-dogs-with-myocardial-infarction
#13
Mari Amino, Koichiro Yoshioka, Yoshiya Furusawa, Sachie Tanaka, Noboru Kawabe, Tadashi Hashida, Teruyo Tsukada, Masako Izumi, Sadaki Inokuchi, Teruhisa Tanabe, Yuji Ikari
BACKGROUND: Targeted external heavy ion irradiation (THIR) of rabbit hearts 2 weeks after myocardial infarction (MI) reduced the vulnerability of fatal ventricular tachyarrhythmias (VT/VF) in association with the increased connexin43 (Cx43). Increased Cx43 was maintained for at least 1 year in normal rabbits, but the long-term antiarrhythmic effects in the MI model are unknown. We investigated the propensity for late potentials and VT/VF inducibility. METHODS: Intracoronary injection of microspheres was performed to induce non-transmural MI in anaesthetized 8 beagles...
February 3, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/28157561/indirect-detection-of-infinite-speed-mas-solid-state-nmr-spectra
#14
Frédéric A Perras, Amrit Venkatesh, Michael P Hanrahan, Tian Wei Goh, Wenyu Huang, Aaron J Rossini, Marek Pruski
Heavy spin-1/2 nuclides are known to possess very large chemical shift anisotropies that can challenge even the most advanced magic-angle-spinning (MAS) techniques. Wide manifolds of overlapping spinning sidebands and insufficient excitation bandwidths often obfuscate meaningful spectral information and force the use of static, low-resolution solid-state (SS)NMR methods for the characterization of materials. To address these issues, we have merged fast-magic-angle-turning (MAT) and dipolar heteronuclear multiple-quantum coherence (D-HMQC) experiments to obtain D-HMQC-MAT pulse sequences which enable the rapid acquisition of 2D SSNMR spectra that correlate isotropic (1)H chemical shifts to the indirectly detected isotropic "infinite-MAS" spectra of heavy spin-1/2 nuclides...
January 18, 2017: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/28153277/paper-based-capacitive-sensors-for-identification-and-quantification-of-chemicals-at-the-point-of-care
#15
Jie Hu, Chee-Hong Takahiro Yew, Xiaoshuang Chen, Shangsheng Feng, Qu Yang, Shuqi Wang, Wei-Hong Wee, Belinda Pingguan-Murphy, Tian Jian Lu, Feng Xu
The identification and quantification of chemicals play a vital role in evaluation and surveillance of environmental health and safety. However, current techniques usually depend on costly equipment, professional staff, and/or essential infrastructure, limiting their accessibility. In this work, we develop paper-based capacitive sensors (PCSs) that allow simple, rapid identification and quantification of various chemicals from microliter size samples with the aid of a handheld multimeter. PCSs are low-cost parallel-plate capacitors (~$0...
April 1, 2017: Talanta
https://www.readbyqxmd.com/read/28151733/correction-factors-to-convert-microdosimetry-measurements-in-silicon-to-tissue-in-12-c-ion-therapy
#16
David Bolst, Susanna Guatelli, Linh T Tran, Lachlan Chartier, Michael L F Lerch, Naruhiro Matsufuji, Anatoly B Rosenfeld
Silicon microdosimetry is a promising technology for heavy ion therapy (HIT) quality assurance, because of its sub-mm spatial resolution and capability to determine radiation effects at a cellular level in a mixed radiation field. A drawback of silicon is not being tissue-equivalent, thus the need to convert the detector response obtained in silicon to tissue. This paper presents a method for converting silicon microdosimetric spectra to tissue for a therapeutic (12)C beam, based on Monte Carlo simulations...
February 2, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28151694/the-effects-of-hze-particles-%C3%AE-and-x-ray-radiation-on-the-survival-and-genetic-integrity-of-halobacterium-salinarum-nrc-1-halococcus-hamelinensis-and-halococcus-morrhuae
#17
Stefan Leuko, Petra Rettberg
Three halophilic archaea, Halobacterium salinarum NRC-1, Halococcus hamelinensis, and Halococcus morrhuae have been exposed to different regimes of simulated outer space ionizing radiation. Strains were exposed to high-energy heavy ion (HZE) particles, namely iron and argon ions, as well as to γ radiation ((60)Co) and X-rays, and the survival and the genetic integrity of the 16S rRNA gene were evaluated. Exposure to 1 kGy of argon or iron ions at the Heavy Ion Medical Accelerator in Chiba (HIMAC) facility at the National Institute for Radiological Sciences (NIRS) in Japan did not lead to a detectable loss in viability; only after exposure to 2 kGy of iron ions a decline in survival was observed...
February 2, 2017: Astrobiology
https://www.readbyqxmd.com/read/28151691/starlife-an-international-campaign-to-study-the-role-of-galactic-cosmic-radiation-in-astrobiological-model-systems
#18
Ralf Moeller, Marina Raguse, Stefan Leuko, Thomas Berger, Christine Elisabeth Hellweg, Akira Fujimori, Ryuichi Okayasu, Gerda Horneck
In-depth knowledge regarding the biological effects of the radiation field in space is required for assessing the radiation risks in space. To obtain this knowledge, a set of different astrobiological model systems has been studied within the STARLIFE radiation campaign during six irradiation campaigns (2013-2015). The STARLIFE group is an international consortium with the aim to investigate the responses of different astrobiological model systems to the different types of ionizing radiation (X-rays, γ rays, heavy ions) representing major parts of the galactic cosmic radiation spectrum...
February 2, 2017: Astrobiology
https://www.readbyqxmd.com/read/28151654/extracellular-saccharide-mediated-reduction-of-au3-to-gold-nanoparticles-new-insights-for-heavy-metals-biomineralization-on-microbial-surfaces
#19
Fuxing Kang, Xiaolei Qu, Pedro J J Alvarez, Dongqiang Zhu
Biomineralization is a critical process controlling the biogeochemical cycling, fate, and potential environmental impacts of heavy metals. Despite the indispensability of extracellular polymeric substances (EPS) to microbial life and their ubiquity in soil and aquatic environments, the role played by EPS in the transformation and biomineralization of heavy metals is not well understood. Here, we used gold ion (Au3+) as a model heavy metal ion to quantitatively assess the role of EPS in biomineralization and discern the responsible functional groups...
February 2, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28150903/recent-progresses-on-metal-organic-frameworks-and-their-derived-nanostructures-for-energy-and-environmental-applications
#20
Zhiqiang Xie, Wangwang Xu, Xiaodan Cui, Ying Wang
Metal-organic frameworks (MOFs), as a very promising category of porous materials, have attracted more and more interest in research communities due to their extremely high surface areas, diverse nanostructures and unique properties. In recent years, there is a growing body of evidence indicating that MOFs can function as ideal templates to prepare various nanostructured materials for energy and environmental cleaning applications. This work reviews the recent progresses in design and synthesis of MOFs and MOF-derived nanomaterials for particular applications in lithium-ion batteries, sodium-ion batteries, supercapacitors, dye-sensitized solar cells and heavy metal ions detection and removal...
February 2, 2017: ChemSusChem
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