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https://www.readbyqxmd.com/read/29150802/ion-imprinted-electrospun-nanofibers-of-chitosan-1-butyl-3-methylimidazolium-tetrafluoroborate-for-the-dynamic-expulsion-of-thorium-iv-ions-from-mimicked-effluents
#1
Prakash Macchindra Gore, Latika Khurana, Suhail Siddique, Anjana Panicker, Balasubramanian Kandasubramanian
The present study explores the innocuous, biocompatible, and extremely competent molecularly imprinted chitosan/RTIL electrospun nanofibers having average diameter of 30 nm for the expulsion of thorium (IV) ions from the mimicked effluent waste. The extended Flory-Huggins theory and three-dimensional molecular modeling have been effectively premeditated via Materials Studio software for enumerating the inter-miscibility and compatibility (Chi parameter (χ) = 1.019, mixing energy (Emix) = 0.603 kcal/mol) of the chitosan/RTIL (1-butyl-3-methylimidazolium tetrafluoroborate)...
November 17, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29150441/co-ii-and-ni-ii-binding-of-the-escherichia-coli-transcriptional-repressor-rcnr-orders-its-n-terminus-alters-helix-dynamics-and-reduces-dna-affinity
#2
Hsin-Ting Huang, Cedric E Bobst, Jeffrey S Iwig, Peter T Chivers, Igor A Kaltashov, Michael J Maroney
RcnR, a transcriptional regulator in Escherichia coli, derepresses the expression of the export proteins RcnAB upon binding Ni(II) or Co(II). Lack of structural information has precluded elucidation of the allosteric basis for the decreased DNA affinity in RcnR's metal-bound states. Here, using hydrogen-deuterium exchange coupled with MS (HDX-MS), we probed the RcnR structure in the presence of DNA, the cognate metal ions Ni(II) and Co(II), or the noncognate metal ion Zn(II). We found that cognate metal binding altered the flexibility from the N-terminus through helix 1 and modulated the RcnR-DNA interaction...
November 17, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29149997/surface-sieving-coordinated-imac-material-for-purification-of-his-tagged-proteins
#3
Senwu Li, Kaiguang Yang, Lukuan Liu, Baofeng Zhao, Yuanbo Chen, Xiao Li, Lihua Zhang, Yukui Zhang
Tailor-made materials for the purification of proteins with His-tag was designed through synergizing the selectivity of surface sieving and metal ion affinity. By excluding impurity proteins out of the surface polymer network, such materials could purify His-tagged proteins from the crude cell lysis with purity up to 90%, improved by 14% compared to that obtained by the commercial metal chelating affinity materials. This study might promote the His-tagged protein purification to a new level.
January 2, 2018: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29149555/mapping-the-reactions-in-a-single-zero-valent-iron-nanoparticle
#4
Lan Ling, Xiao-Yue Huang, Meirong Li, Wei-Xian Zhang
Nanoscale zero-valent iron (nZVI) posseses unique functionalities for metal-metalloid removal and sequestration. So far, direct evidence on the heavy metal-iron reactions in the solid phase is still limited due to low concentration of heavy metals and small size of nanoparticles. In this work, angstrom-resolution spectral mappings on the reactions of nZVI with chromate, arsenate, nickel, silver, cesium, and zinc ions are presented. This work was achieved with spherical aberration-corrected scanning transmission electron microscopy integrated with high-sensitivity X-ray energy-dispersive spectroscopy scanning transmission electron microscopy (XEDS-STEM)...
November 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29149553/cobalt-sulfide-quantum-dots-embedded-n-s-doped-carbon-nanosheets-with-superior-reversibility-and-rate-capability-for-sodium-ion-batteries
#5
Qiubo Guo, Yifan Ma, Tingting Chen, Qiuying Xia, Mei Yang, Hui Xia, Yan Yu
Metal sulfides are promising anode materials for sodium-ion batteries due to their large specific capacities. The practical application of metal sulfides in sodium-ion batteries, however, are still limited due to their large volume expansion, poor cycling stability, and sluggish electrode kinetics. In this work, a unique two-dimensional heterostructure of CoSx (CoS and Co9S8) quantum dots embedded N/S-doped carbon nanosheets (CoSx@NSC) is prepared by a facile sol-gel method. The CoSx quantum dots are in-situ formed within ultrafine carbon nanosheets without further sulfidation, thus resulting in ultrafine CoSx particle size and embedded heterostructure...
November 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/29149404/the-translational-controlled-tumour-protein-tctp-biological-functions-and-regulation
#6
Ulrich-Axel Bommer
The Translational Controlled Tumour Protein TCTP (gene symbol TPT1, also called P21, P23, Q23, fortilin or histamine-releasing factor, HRF) is a highly conserved protein present in essentially all eukaryotic organisms and involved in many fundamental cell biological and disease processes. It was first discovered about 35 years ago, and it took an extended period of time for its multiple functions to be revealed, and even today we do not yet fully understand all the details. Having witnessed most of this history, in this chapter, I give a brief overview and review the current knowledge on the structure, biological functions, disease involvements and cellular regulation of this protein...
2017: Results and Problems in Cell Differentiation
https://www.readbyqxmd.com/read/29148917/evaluation-of-antibacterial-activity-and-toxic-metal-removal-of-chemically-synthesized-magnetic-iron-oxide-titanium-coated-nanoparticles-and-application-in-bacterial-treatment
#7
Yasser A M Abdulhady, Mona M El-Shazly, Reham F El-Kased
Co-precipitation method was used for preparation of two types of iron oxide nanoparticles coated by titanium dioxide according to divalent salts used. The average size of iron oxide nanoparticles coated by titanium dioxide measured by particle size analyzer, ranged approximately between 20 nm and 100 nm with mean particle size of 60 nm. Characterization of the prepared nanoparticles was done by X-ray diffraction analysis and scanning electron microscope indicating the sole existence of inverse cubic spinel phase of magnetic iron oxide nanoparticles...
November 17, 2017: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/29148745/influence-of-counter-cation-hydration-enthalpies-on-the-formation-of-molecular-complexes-a-thorium-nitrate-example
#8
Geng Bang Jin, Jian Lin, Shanna L Estes, Suntharalingam Skanthakumar, Lynda Soderholm
The influence of counter-cations (A(n+)) in directing the composition of monomeric metal-ligand (ML) complexes that precipitate from solution are often overlooked despite the wide usage of A(n+) in materials synthesis. Herein we describe a correlation between the composition of ML complexes and A(+) hydration enthalpies found for two related series of Th-nitrate molecular compounds obtained by evaporating acidic aqueous Th-nitrate solutions in the presence of A(+) counter-ions. Analyses of their chemical composition and solid-state structures demonstrate that A(+) not only affects the overall solid-state packing of the Th-nitrato complexes but also influences the composition of the Th-nitrato monomeric anions themselves...
November 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29148741/controlling-association-and-separation-of-gold-nanoparticles-with-computationally-designed-zinc-coordinating-proteins
#9
Matthew J Eibling, Christopher M MacDermaid, Zhaoxia Qian, Christopher J Lanci, So-Jung Park, Jeffery G Saven
Functionalization of nanoparticles with biopolymers has yielded a wide range of structured and responsive hybrid materials. DNA provides the ability to program length and recognition using complementary oligonucleotide sequences. Nature more often leverages the versatility of proteins, however, where structure, assembly, and recognition are more subtle to engineer. Herein, a protein was computationally designed to present multiple Zn(2+) coordination sites and cooperatively self-associate to form an antiparallel helical homodimer...
November 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29148736/formation-of-metal-cyanide-complexes-in-deliquescent-airborne-particles-a-new-possible-sink-for-hcn-in-urban-environments
#10
Chiara Giorio, Daniele Marton, Gianni Formenton, Andrea Tapparo
Hydrogen cyanide is a ubiquitous gas in the atmosphere and a biomass burning tracer. Reactive gasses can be adsorbed onto aerosol particles where they can promote heterogeneous chemistry. In the present study, we report for the first time on the measurement and speciation of cyanides in atmospheric aerosol. Filter samples were collected at an urban background site in the city center of Padua (Italy), extracted and analyzed with headspace gas chromatography and nitrogen-phosphorous detection. The results showed that strongly bound cyanides were present in all aerosol samples at a concentration ranging between 0...
November 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29148727/substrate-assisted-in-situ-confinement-pyrolysis-of-zeolitic-imidazolate-frameworks-to-nitrogen-doped-hierarchical-porous-carbon-nanoframes-with-superior-lithium-storage
#11
Wei Tian, Jialiang Liu, Yixian Wang, Jingyan Liu, Yanpeng Li, Mingbo Wu
Porous carbons generated from the direct pyrolysis of metal organic frameworks (MOFs) have showed great potential as a kind of promising electrode materials for lithium-ion batteries (LIBs). However, several common drawbacks, such as the inevitable structural damage during carbonization process and intrinsic micropore-dominated feature of MOFs-derived products, largely impede the exposure of active sites and mass transfer, thus usually resulting in inferior electrochemical performances. In this work, an effective and controllable approach was reported to construct nitrogen-doped hierarchical porous carbon nanoframes (N-HPCFs) through in situ pyrolysis transformation of small-sized zeolitic imidazolate frameworks (ZIFs) that are in advance combined with a two-dimensional substrate templated from g-C3N4...
November 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29148701/metal-organic-framework-derived-metal-oxide-embedded-in-nitrogen-doped-graphene-network-for-high-performance-lithium-ion-batteries
#12
Zhu-Yin Sui, Pei-Ying Zhang, Meng-Ying Xu, Yuwen Liu, Zhi-Xiang Wei, Bao-Hang Han
Metal-organic frameworks (MOFs) are hybrid inorganic-organic materials that can be used as effective precursors to prepare various functional nanomaterials for energy-related applications. Nevertheless, most MOF-derived metal oxides exhibit low electrical conductivity and mechanical strain. These characteristics limit their electrochemical performance and hamper their practical application. Herein, we report a rational strategy for enhancing the lithium storage performance of MOF-derived metal oxide. The hierarchically porous Co3O4@NGN is successfully prepared by embedding ZIF-67-derived Co3O4 particles in a nitrogen-doped graphene network (NGN)...
November 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29148623/dual-roles-of-protein-as-a-template-and-a-sulfur-provider-a-general-approach-to-metal-sulfides-for-efficient-photothermal-therapy-of-cancer
#13
Jianping Sheng, Liqiang Wang, Yajing Han, Wansong Chen, Hong Liu, Min Zhang, Liu Deng, You-Nian Liu
Fabrication of clinically translatable nanoparticles (NPs) as photothermal therapy (PTT) agents against cancer is becoming increasingly desirable, but still challenging, especially in facile and controllable synthesis of biocompatible NPs with high photothermal efficiency. A new strategy which uses protein as both a template and a sulfur provider is proposed for facile, cost-effective, and large-scale construction of biocompatible metal sulfide NPs with controlled structure and high photothermal efficiency...
November 17, 2017: Small
https://www.readbyqxmd.com/read/29148604/biomass-derived-n-doped-carbons-with-silica-supported-ultrasmall-zno-nanoparticles-robust-catalysts-for-the-green-synthesis-of-benzimidazoles
#14
Bo Chen, Chan Zhang, Libo Niu, Xiaozhen Shi, Huiling Zhang, Xingwang Lan, Guoyi Bai
Ultrasmall ZnO nanoparticles anchored on N-doped carbons with silica support (ZnO/SiO2-NC) were fabricated from chitosan and metal ions using a one-pot self-assembly strategy, and were successfully applied to the synthesis of 2-arylbenzimidazoles under mild conditions. These catalysts showed excellent stability and could be used six times without loss of conversion and selectivity. Using silica gel and biomass chitosan as a source of hydrophilic N-doped carbon facilitated the uniform dispersion of the ZnO nanoparticles in methanol and therefore their contact with reactants, contributing to a high catalytic performance...
November 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29147716/complex-coacervation-of-mg-ii-phospho-polymethacrylate-a-synthetic-analog-of-sandcastle-worm-adhesive-phosphoproteins
#15
In Taek Song, Russell J Stewart
The highly phosphorylated Pc3 proteins, major components of the sandcastle worm adhesive, are sequestered with Mg as spherical sub-granules within heterogeneous secretory granules in adhesive gland cells. The phase behavior of a synthetic phospho-polymethacrylate analog of the Pc3 phosphoproteins, in the presense of Mg(ii), was characterized to determine whether it is chemically possible for the natural adhesive components to be packaged and stored as liquid complex coacervates. Of several multivalent metal salts tested, only MgCl induced complex coacervation of the phospho-copolymer...
November 17, 2017: Soft Matter
https://www.readbyqxmd.com/read/29146988/variations-in-nutrient-and-trace-element-composition-of-rice-in-an-organic-rice-frog-coculture-system
#16
Zhimin Sha, Qingnan Chu, Zheng Zhao, Yubo Yue, Linfang Lu, Jing Yuan, Linkui Cao
Introducing frogs into paddy fields can control pests and diseases, and organic farming can improve soil fertility and rice growth. The aim of this 2-year field study was compare the yield and elemental composition of rice between an organic farming system including frogs (ORF) and a conventional rice culture system (CR). The grain yields were almost the same in the ORF system and the CR system. The ORF significantly increased the contents of phosphorus (P), ion (Fe), zinc (Zn), molybdenum (Mo) and selenium (Se) in rice grain at one or both years...
November 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29146968/heterologous-expression-and-characterization-of-a-new-lipase-from-pseudomonas-fluorescens-pf0-1-and-used-for-biodiesel-production
#17
Wu Liu, Menggang Li, Yunjun Yan
As a kind of important biocatalysts, Pseudomonas lipases are commonly applied in various industrial fields. Pflip1, a new extracellular lipase gene from Pseudomonas. fluorescens Pf0-1, was first cloned and respectively expressed in Escherichia coli BL21(DE3) and Pichia pastoris KM71, the recombinant proteins Pflip1a and Pflip1b were later purified separately. Then Pflip1a was further characterized. The optimum pH of Pflip1a was 8.0 and its optimal temperature was 70 °C. After incubation at 70 °C for 12 h, Pflip1a could retain over 95% of its original activity...
November 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29145059/binding-of-naringin-and-naringenin-with-hen-egg-white-lysozyme-a-spectroscopic-investigation-and-molecular-docking-study
#18
Sourav Das, Pooja Ghosh, Sudipta Koley, Atanu Singha Roy
The interactions of naringenin (NG) and naringin (NR) with Hen Egg White Lysozyme (HEWL) in aqueous medium have been investigated using UV-vis spectroscopy, steady-state fluorescence, circular dichroism (CD), Fourier Transform infrared spectroscopy (FT-IR) and molecular docking analyses. Both NG and NR can quench the intrinsic fluorescence of HEWL via static quenching mechanism. At 300K, the value of binding constant (Kb) of HEWL-NG complex (5.596±0.063×10(4)M(-1)) was found to be greater than that of HEWL-NR complex (3...
November 8, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29144983/albumin-coordinated-assembly-of-clearable-platinum-nanodots-for-photo-induced-cancer-theranostics
#19
Yong'an Tang, Tao Yang, Qiaoli Wang, Xiaoyan Lv, Xue Song, Hengte Ke, Zhengqing Guo, Xiaoqing Huang, Jun Hu, Zifu Li, Peng Yang, Xiangliang Yang, Huabing Chen
Photoactive noble metal nanoparticles are of increasing importance toward personalized cancer therapy in the field of precision nanomedicine. A critical challenge remains in the exploration of clinically potential noble metal nanoparticles for highly efficient cancer theranostics. Here, we introduce albumin-coordinated assembly of clearable Pt nanodots (Pt-NDs) with monodisperse nanostructure as high-performance theranostic agents for imaging-guided photothermal tumor ablation. We precisely manipulate the reduction and growth of tetravalent Pt ions into ultrasmall nanodots through albumin-directed growth kinetics, thereby leading to the synthesis of monodisperse 6...
October 20, 2017: Biomaterials
https://www.readbyqxmd.com/read/29144747/structural-variability-of-4f-and-5f-thiocyanate-complexes-and-dissociation-of-uranium-iii-thiocyanate-bonds-with-increased-ionicity
#20
Saptarshi Biswas, Shuwen Ma, Stefano Nuzzo, Brendan Twamley, Andrew T Russell, James A Platts, František Hartl, Robert J Baker
A series of complexes [Et4N][Ln(NCS)4(H2O)4] (Ln = Pr, Tb, Dy, Ho, Yb) have been structurally characterized, all showing the same structure, namely a distorted square antiprismatic coordination geometry, and the Ln-O and Ln-N bond lengths following the expected lanthanide contraction. When the counterion is Cs(+), a different structural motif is observed and the eight-coordinate complex Cs5[Nd(NCS)8] isolated. The thorium compounds [Me4N]4[Th(NCS)7(NO3)] and [Me4N]4[Th(NCS)6(NO3)2] have been characterized, and high coordination numbers are also observed...
November 16, 2017: Inorganic Chemistry
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