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Jonathan Bruno, Nicola Pozzi, Jonathan Oliva, John C Edwards
Apolipoprotein L1 (ApoL1) is a human serum protein conferring resistance to African trypanosomes, and certain ApoL1 variants increase susceptibility to some progressive kidney diseases. ApoL1 has been hypothesized to function like a pore-forming colicin and been reported to have permeability effects on both intracellular and plasma membranes. Here, to gain insight into how ApoL1 may function in vivo, we used vesicle-based ion-permeability, direct membrane-association, and intrinsic fluorescence to study the activities of purified recombinant ApoL1...
September 15, 2017: Journal of Biological Chemistry
Qingrui Zhang, Yixuan Li, Qinggang Yang, He Chen, Xinqing Chen, Tifeng Jiao, Qiuming Peng
Toxic heavy metal containing Cr(VI) species is a serious threat for ecological environment and human beings. In this work, a new mussel-inspired polydopamine microsphere (PDA-sphere) is prepared through in situ oxidative polymerization at air condition with controllable sizes. The adsorption of Cr(VI) ions onto PDA-sphere is highly pH dependent with the optimal pH ranging from 2.5 to 3.8. A rapid Cr(VI) removal can approach in 8min for equilibrium. More importantly, the prepared materials exhibit a remarkable sorption selectivity, coexisting SO4(2-), NO3(-) and Cl(-) ions at high levels; The applicability model further proves its effective performances with treated capacity of 42,000kg/kg sorbent, and the effluent can be reduced from 2000ppb to below 50ppb, which meets the drinking water criterions recommended by WHO...
August 26, 2017: Journal of Hazardous Materials
Guangjie He, Xiangli Liu, Jinhe Xu, Liguo Ji, Linlin Yang, Aiying Fan, Songjun Wang, Qingzhi Wang
A highly selective copper ions fluorescent probe based on the coumarin-type Schiff base derivative 1 (probe) was produced by condensation reaction between coumarin carbohydrazide and 1H-indazole-3-carbaldehyde. The UV-vis spectroscopy showed that the maximum absorption peak of compound 1 appeared at 439nm. In the presence of Cu(2+) ions, the maximum peak decreased remarkably compared with other physiological important metal ions and a new absorption peak at 500nm appeared. The job's plot experiments showed that complexes of 1:2 binding mode were formed in CH3CN:HEPES (3:2, v/v) solution...
September 13, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Tesfaye Tolessa, Zhi-Qiang Tan, Yong-Guang Yin, Jing-Fu Liu
A novel headspace colorimetric nanosensor strategy for specific detection of Hg(II) was developed based upon analyte induced etching and amalgamation of gold nanoparticles (AuNPs). The Hg(II) was first selectively reduced to its volatile form, Hg(0), by stannous chloride (SnCl2) through chemical cold vapor generation (CVG) reaction. Then, the Hg(0) was headspace extracted into 37μL thioglycolic acid functionalized AuNP aqueous suspension containing 10% methanol as extractant and simultaneously reacted with AuNPs through the strong metallophilic Hg-Au interaction, resulting in a red-to-blue color change...
January 1, 2018: Talanta
Ting Yu, Guoxing Yin, Tingting Niu, Peng Yin, Haitao Li, Youyu Zhang, Haimin Chen, Ying Zeng, Shouzhuo Yao
A novel fluorescent probe (E)-3-ethyl-2-(4-hydroxystyryl)-1,1-di-methyl-1H-benzo-[e]indolium iodide (probe EDB) based on benzo[e]indolium was synthesized, which provided the simultaneous detection of SO3(2-)/HSO3(-) and HSO4(-) ion with different emission channels. Based on the principle of ion-induced rotation-displaced H-aggregates, when treated with NaHSO4, a fluorescence enhancement at 580nm was observed with the excitation wavelength at 420nm. While, in the advantage of the nucleophilic addition of SO3(2-) to the vinyl group, strong fluorescence was obtained at 455nm when treated with Na2SO3 with the excitation wavelength at 320nm, along with obvious color change by naked eyes...
January 1, 2018: Talanta
Gábor Gullner, Csilla Juhász, Adél Németh, Balázs Barna
The interactions of powdery mildew (Golovinomyces orontii) and Tobacco mosaic virus (TMV) with tobacco lines having down or upregulated antioxidants were investigated. Xanthi-nc, its salicylic acid-deficient NahG mutant, a paraquat-sensitive Samsun (PS) and its paraquat tolerant (PT) mutant were used. Cell membrane damage caused by H2O2 was significantly higher in NahG than Xanthi, whereas it was lower in PT than in PS. Leakage of ions from PT was reduced by the powdery mildew infection. On the other hand TMV inoculation led to a 6-fold and 2-fold elevation of ion leakage from hypersensitive resistant NahG and Xanthi leaves, respectively, whereas ion leakage increased slightly from susceptible PS leaves...
September 8, 2017: Plant Physiology and Biochemistry: PPB
Xinan Huang, Sohail Anjum Shahzad, Yongxin Li, Yunyi Zhang, Lijia Sang, Huipeng Zhou, Hong Jiang, Kenneth Kam-Wing Lo, Cong Yu
A novel and efficient approach has been established for the synthesis of silver nanoclusters capped silica nanoparticles (SiO2@AgNCs). These nanoclusters (AgNCs) capped silica nanoparticles were utilized as a novel ratiometric photoluminescence (PL) nanosensor for extremely sensitive and selective detection of I(-) and S(2-) ions. The AgNCs were prepared in situ on the silica nanoparticles through polyethyleneimine (PEI) template approach. While dual PL emissions of AgNCs (at 500 nm) and luminescent silica nanoparticles (at 602 nm) formed the basis for the ratiometric sensing...
October 2, 2017: Analytica Chimica Acta
Mengyao Wang, Yue Wu, Yong He, Xiaoxiao Su, Hui Ouyang, Zhifeng Fu
A bioluminescent method was proposed for rapid detection of viable Gram-positive bacteria based on a novel antibiotic-affinity strategy on a magnetic beads (MBs) platform. Daptomycin, a highly efficient lipopeptide antibiotic for Gram-positive bacteria, was used as a recognition agent to functionalize MBs. The daptomycin-functionalized MBs showed high capture and concentration efficiency for Gram-positive bacteria due to the strong binding between daptomycin and bacterial cell membrane in the presence of Ca(2+) ion...
September 22, 2017: Analytica Chimica Acta
D Reuter, C Geiß, P Lunkenheimer, A Loidl
Ionically conducting plastic crystals (PCs) are possible candidates for solid-state electrolytes in energy-storage devices. Interestingly, the admixture of larger molecules to the most prominent molecular PC electrolyte, succinonitrile, was shown to drastically enhance its ionic conductivity. Therefore, binary mixtures seem to be a promising way to tune the conductivity of such solid-state electrolytes. However, to elucidate the general mechanisms of ionic charge transport in plastic crystals and the influence of mixing, a much broader database is needed...
September 14, 2017: Journal of Chemical Physics
Konrad Breitsprecher, Manuel Abele, Svyatoslav Kondrat, Christian Holm
Nanoporous supercapacitors play an important role in modern energy storage systems, and their modeling is essential to predict and optimize the charging behaviour. Two classes of models have been developed that consist of finite and infinitely long pores. Here, we show that although both types of models predict qualitatively consistent results, there are important differences emerging due to the finite pore length. In particular, we find that the ion density inside a finite pore is not constant, but increases linearly from the pore entrance to the pore end, where the ions form a strongly layered structure...
September 14, 2017: Journal of Chemical Physics
Mengjiao Ma, Congcong Li, Dengkun Shu, Chaohua Wang, Peng Xi
A photoluminescent terbium (Tb) complex involving a novel benzoic-acid compound with a unique coordinated structure, namely 1,4-bis(carbonylmethyl)terephthalate (BCMT), has been designed and synthesized. The new coordinate structure and energy-transfer mechanism between the ligand and Tb(III) ions were investigated in detail. The results demonstrated that the BCMT-Tb(III) complex shows strong fluorescence intensity (4×10(6)a.u.) and long fluorescence lifetime (1.302ms), owing to the favorable degree of energy matching between the triplet excited level of the ligand and the resonant level of Tb(III) ions...
September 8, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Weijian Chen, Yajie Zhang, Xiao Li, Hong Chen, Jian Sun, Fude Feng
We took advantage of gasotransmitter H2S as a chemical reaction-based trigger for controlled release of doxorubicin which is pre-coordinated by copper ions and enclosed in horse spleen apoferritin. The nanocomposite is stable at physiological pH and temperature before H2S activation. The drug release strategy avoids disassembly of protein shells and is controllable by the strong affinity of sulfide with copper ions. The in vitro cytotoxicity assay indicates the antitumor effect of doxorubicin toward tumor cells could be achievable by H2S activation...
September 15, 2017: ACS Applied Materials & Interfaces
Valentina Dall'Asta, Daniel Buchholz, Luciana Gomes Chagas, Xinwei Dou, Chiara Ferrara, Eliana Quartarone, Cristina Tealdi, Stefano Passerini
TThe implementation of aqueous electrode processing of cathode materials is a key for the development of greener Na-ion batteries. Herein, the development and optimization of the aqueous electrode processing for the eco-friendly Na0.44MnO2 (NMO) cathode material, employing CarboxyMethylCellulose (CMC) as binder, is reported for the first time. The characterization of such electrode reveals as the performances are strongly affected by the employed electrolyte solution, especially, the sodium salt and the use of electrolyte's additives...
September 15, 2017: ACS Applied Materials & Interfaces
Olaf Lühker, Marc Moritz Berger, Alexander Pohlmann, Lorenz Hotz, Tilmann Gruhlke, Marcel Hochreiter
PURPOSE: Both exercise and hypoxia cause complex changes in acid-base homeostasis. The aim of the present study was to investigate whether during intense physical exercise in normoxia and hypoxia, the modified physicochemical approach offers a better understanding of the changes in acid-base homeostasis than the traditional Henderson-Hasselbalch approach. METHODS: In this prospective, randomized, crossover trial, 19 healthy males completed an exercise test until voluntary fatigue on a bicycle ergometer on two different study days, once during normoxia and once during normobaric hypoxia (12% oxygen, equivalent to an altitude of 4500 m)...
September 15, 2017: European Journal of Applied Physiology
L Krishna Bharat, G Seeta Rama Raju, Jae Su Yu
We report the synthesis of spherical-shaped rare-earth (Eu(3+) and Tb(3+)) ions doped CaMoO4 nanoparticles in double solvents (IPA and H2O) with the help of autoclave. The X-ray diffraction patterns well match with the standard values and confirm the crystallization in a tetragonal phase with an I41/a (88) space group. The luminescence spectra exhibit the strong red and green emissions from Eu(3+) and Tb(3+) ions doped samples, respectively. The X-ray photoelectron spectroscopy results show the oxidation states of all the elements present in the sample...
September 14, 2017: Scientific Reports
Mingquan Yan, Jing Ma, Chenyang Zhang, Yuxuan Zhou, Fei Liu, Xuze Han, Mingyang Li, Jinren Ni
It is believed that dissolved organic matter (DOM) plays an important role in carrying metal ions through global cycle and distribution, while this point has not yet been elucidated clearly as DOM is extremely heterogeneous and site-specific. In this study, optical properties of DOM in 53 surface freshwater sites all over China were recorded by UV-Vis absorbance spectroscopy in pH range 3-11. The subtle processes of protonation-deprotonation of DOM were quantified by tracking the changes of DOM spectra. The binding capacities of DOMs-binding sites and affinity constants-were interpreted by introducing a spectral parameter, differential log-transformed differential absorbance at 400 nm (DlnA400) in combination with Non-Ideal Competitive Adsorption (NICA) Model...
September 3, 2017: Chemosphere
Katarzyna A Wolny-Koładka, Dagmara K Malina
The aim of this study was to explore the toxicity of silver nanoparticles (AgNPs) synthesized by chemical reduction method assessment with regard to airborne strains of Staphylococcus spp. The first step of the experiment was the preparation of silver nanoparticle suspension. The suspension was obtained by a fast and simple chemical method involving the reduction of silver ions through a reducing factor in the presence of the suitable stabilizer required to prevent the aggregation. In the second stage, varied instrumental techniques were used for the analysis and characterization of the obtained nanostructures...
September 14, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
Baharan Ali Doosti, Weria Pezeshkian, Dennis Skjøth Bruhn, John Hjort Ipsen, Himanshu Khandelia, Gavin D M Jeffries, Tatsiana Lobovkina
Experimental and theoretical studies on ion-lipid interactions, predict that binding of calcium ions to cell membranes leads to macroscopic mechanical effects and membrane remodeling. Herein, we provide experimental evidence that a point-source of Ca2+ acting upon a negatively charged membrane, generates spontaneous curvature and triggers the formation of tubular protrusions that point away from the ion source. This behavior is rationalized by strong binding of the divalent cations to the surface of the charged bilayer which effectively neutralizes the surface charge density of outer leaflet of the bilayer...
September 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Zhao-Feng Wu, Xiao-Ying Huang
Herein, the solvothermal preparations, crystal structures, and fluorescence properties of three Mg-Zn heterometallic coordination polymers (CPs), i.e. [Mg2Zn2(OH)2(1,4-NDC)3(H2O)2]·6H2O (1), [Mg1.13Zn1.87(1,4-NDC)3(dppe)(CH3OH)] (2), and [Mg1.17Zn1.83(1,4-NDC)3(py)2]·1.5py (3), based on the mixed ligands of 1,4-naphthalene dicarboxylic acid (1,4-H2NDC) and N-containing ligands of 1,3-di(4-pyridyl)propane (dppe) or pyridine (py) are presented. In the title compounds, Zn and Mg are statistically distributed, as confirmed by single crystal analysis, and the ratios of Zn and Mg have been identified by inductively coupled plasma (ICP) measurements...
September 14, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Santosh Kumar, Stephen Spiro
The genome of the denitrifying bacterium Paracoccus denitrificans predicts the expression of a small heme-containing nitric oxide (NO) binding protein, H-NOX. The genome organization and prior work in other bacteria suggest that H-NOX interacts with a diguanylate cyclase that cyclizes GTP to make cyclic di-GMP (cdGMP). Since cdGMP frequently regulates attached growth as a biofilm, we first established conditions for biofilm development by P. denitrificans. We found that adhesion to a polystyrene surface is strongly stimulated by the addition of 10 mM Ca(2+) to rich media...
September 2017: MSphere
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