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https://www.readbyqxmd.com/read/28731690/the-metal-drives-the-chemistry-dual-functions-of-acireductone-dioxygenase
#1
Aditi R Deshpande, Thomas C Pochapsky, Dagmar Ringe
Acireductone dioxygenase (ARD) from the methionine salvage pathway (MSP) is a unique enzyme that exhibits dual chemistry determined solely by the identity of the divalent transition-metal ion (Fe(2+) or Ni(2+)) in the active site. The Fe(2+)-containing isozyme catalyzes the on-pathway reaction using substrates 1,2-dihydroxy-3-keto-5-methylthiopent-1-ene (acireductone) and dioxygen to generate formate and the ketoacid precursor of methionine, 2-keto-4-methylthiobutyrate, whereas the Ni(2+)-containing isozyme catalyzes an off-pathway shunt with the same substrates, generating methylthiopropionate, carbon monoxide, and formate...
July 21, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28731205/smart-construction-of-nitrogen-doped-carbon-coated-mose2-microspheres-with-enhanced-performance-for-lithium-storage
#2
Wangjia Tang, Dong Xie, Tong Shen, Xiuli Wang, Donghuang Wang, Xuqing Zhang, Xinhui Xia, Jianbo Wu, Jiangping Tu
Exploring advanced anode materials with highly reversible capacity have gained great interests for large-scale lithium storage. Herein, a facile two-step method is developed to synthesize nitrogen-doped carbon coated MoSe2 microspheres via hydrothermal plus thermal polymerization. The MoSe2 microspheres composed of interconnected nanoflakes are homogeneously coated by thin nitrogen-doped carbon (N-C) layer. As an anode for lithium ion batteries, the MoSe2/N-C composite shows better reversibility, smaller polarization and higher electrochemical reactivity as compared to the unmodified MoSe2 microspheres...
July 21, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28731120/na3v2-po4-3-coated-by-n-doped-carbon-from-ionic-liquid-as-cathode-materials-for-high-rate-and-long-life-na-ion-batteries
#3
Yu Yao, Yu Jiang, Hai Yang, Xizhen Sun, Yan Yu
A facile and simple hydrothermal assisted sol-gel route was developed to prepare nitrogen doped carbon coated Na3V2(PO4)3 nanocomposites (denoted as NVP@C-N) as cathodes for sodium ion batteries (NIBs). An ionic liquid (EMIm-dca) was used as the nitrogen doped carbon source. The optimized N-doped carbon coated Na3V2(PO4)3 (denoted as NVP@C-N150) displays a very thin and uniform N-doped carbon coating layer (thickness: ∼2 nm), showing an excellent sodium storage performance (85 mA h g(-1) at 20 C after 5000 cycles) and high rate capability (71 mA h g(-1) at 80 C)...
July 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28730646/prospective-observational-study-of-carbon-ion-radiotherapy-for-non-squamous-cell-carcinoma-of-the-head-and-neck
#4
Katsuyuki Shirai, Jun-Ichi Saitoh, Atsushi Musha, Takanori Abe, Daijiro Kobayashi, Takeo Takahashi, Tomoaki Tamaki, Hidemasa Kawamura, Yukihiro Takayasu, Masato Shino, Minoru Toyoda, Katsumasa Takahashi, Junko Hirato, Satoshi Yokoo, Kazuaki Chikamatsu, Tatsuya Ohno, Takashi Nakano
To evaluate the efficacy and safety of carbon-ion radiotherapy for non-squamous cell carcinoma of the head and neck. Thirty-five patients were enrolled in this prospective study. The primary endpoint was the 3-year local control rate, while secondary endpoints included the 3-year overall survival rate and adverse events. Acute and late adverse events were evaluated according to the Common Terminology Criteria for Adverse Events, version 4.0. The median follow-up time for all patients was 39 months. Thirty-two and 3 patients received 64...
July 21, 2017: Cancer Science
https://www.readbyqxmd.com/read/28730494/deconstructing-the-metabolic-networks-of-oncogenic-signaling-using-targeted-liquid-chromatography-tandem-mass-spectrometry-lc-ms-ms
#5
George Poulogiannis
Metabolic reprogramming is recognized as an emerging hallmark of oncogenic signaling and cancer development. Hence the need to identify novel quantitative analytical platforms for studying metabolism in vitro and in vivo has dramatically increased. Here, we describe the experimental workflow for a targeted liquid chromatography-tandem mass spectrometry (LC-MS/MS) approach involving positive/negative ion switching to analyze >250 metabolites of central carbon metabolism, nucleotides, and amino acids.
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28730356/seasonal-variation-of-chemical-composition-and-source-apportionment-of-pm2-5-in-pune-india
#6
Ranjeeta D Gawhane, Pasumarthi Surya Prakasa Rao, Krishnakant B Budhavant, Vinayak Waghmare, Dhananjay C Meshram, Pramod D Safai
Particulate matter with size less than or equal to 2.5 μm (PM2.5) samples were collected from an urban site Pune, India, during April 2015 to April 2016. The samples were analyzed for various chemical constituents, including water soluble inorganic ions, organic carbon (OC), and elemental carbon (EC). The yearly mean total mass concentration of PM2.5 at Pune was 37.3 μg/m(3), which is almost four times higher than the annual WHO standard (10 μg/m(3)), and almost equal to that recommended by the Central Pollution Control Board, India (40 μg/m(3))...
July 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28729686/ultralow-voltage-operation-of-biologically-assembled-all-carbon-nanotube-nanomesh-transistors-with-ion-gel-gate-dielectrics
#7
Hye-Hyeon Byeon, Kein Kim, Woong Kim, Hyunjung Yi
The demonstration of field-effect transistors (FETs) based entirely on single-walled carbon nanotubes (SWNTs) would enable the fabrication of high-on-current, flexible, transparent and stretchable devices owing to the excellent electrical, optical, and mechanical properties of SWNTs. Fabricating all-SWNT-based FETs via simple solution process, at room temperature and without using lithography and vacuum process could further broaden the applicability of all-SWNT-FETs. In this work, we report on biologically assembled all SWNT-based transistors and demonstrate that ion-gel-gated network structures of unsorted SWNTs assembled using a biological template material enabled operation of SWNT-based transistors at a very low voltage...
July 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28728113/catalase-based-hydrogen-peroxide-biosensor-for-mercury-determination-by-inhibition-measurements
#8
Basant Elsebai, Mariana Emilia Ghica, Mohammed Nooredeen Abbas, Christopher M A Brett
A new amperometric hydrogen peroxide enzyme inhibition biosensor for the indirect determination of toxic mercury ions, Hg(2+), based on catalase immobilized on a glassy carbon electrode surface by cross-linking with glutaraldehyde and bovine serum albumin, is reported. The parameters influencing biosensor performance were optimized, including enzyme loading, the amount of hydrogen peroxide, the applied potential and electrolyte pH. It was shown that the inhibition of catalase by Hg(2+) species is irreversible, with a linear inhibition response between 5×10(-11) and 5×10(-10)M...
July 11, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28727901/carbon-ion-radiotherapy-for-isolated-para-aortic-lymph-node-recurrence-from-colorectal-cancer
#9
Yuka Isozaki, Shigeru Yamada, Shohei Kawashiro, Shigeo Yasuda, Naomi Okada, Daniel Ebner, Hiroshi Tsuji, Tadashi Kamada, Hisahiro Matsubara
BACKGROUND: The safety and effectiveness of carbon-ion radiotherapy (CIRT) for isolated para-aortic lymph node (PALN) metastasis was evaluated retrospectively. METHODS: CIRT for isolated PALN metastasis from CRC was performed in 34 cases from June 2006 to August 2015 in our institute. A median dose of 52.8 Gy(RBE) (range, 48-52.8 Gy(RBE)) was delivered with a median daily dose of 4.4 Gy(RBE) (range, 4.0-4.4 Gy(RBE)). RESULTS: The median follow-up duration for all patients was 24...
July 20, 2017: Journal of Surgical Oncology
https://www.readbyqxmd.com/read/28727246/recognition-and-extraction-of-cesium-hydroxide-and-carbonate-using-a-neutral-multitopic-ion-pair-receptor
#10
Qing He, Gretchen Marie Peters, Vincent M Lynch, Jonathan L Sessler
Current approaches to lowering the pH of basic media rely on the addition of a proton source. An alternative approach is described here that involves the liquid-liquid extraction-based removal of cesium salts, specifically CsOH and Cs2CO3, from highly basic media. A multitopic ion-pair receptor (2) is used that can recognize and extract the hydroxide and carbonate anions as their cesium salts, as confirmed by 1H NMR spectroscopic titrations, ICP-MS, single-crystal structural analyses and theoretical calculations...
July 20, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28726881/effects-of-co2-adsorption-on-proton-migration-on-a-hydrated-zro2-surface-an-ab-initio-molecular-dynamics-study
#11
Ryuhei Sato, Yasushi Shibuta, Fuyuki Shimojo, Shu Yamaguchi
Hydration reactions on a carbonate-terminated cubic ZrO2(110) surface were analyzed using ab initio molecular dynamics (AIMD) simulations. After hydration reactions, carbonates were still present on the surface at 500 K. However, these carbonates are very weak conjugate bases and only act as steric hindrance in proton hopping processes between acidic chemisorbed H2O molecules (Zr-OH2) and monodentate hydroxyl groups (Zr-OH(-)). Similar to a carbonate-free hydrated surface, Zr-OH2, Zr-OH(-), and polydentate hydroxyl groups ([double bond splayed left]OH(+)) were observed, while the ratio of acidic Zr-OH2 was significantly larger than that on the carbonate-free hydrated surface...
July 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28726827/nitrogen-reduction-and-functionalization-by-a-multimetallic-uranium-nitride-complex
#12
Marta Falcone, Lucile Chatelain, Rosario Scopelliti, Ivica Živković, Marinella Mazzanti
Molecular nitrogen (N2) is cheap and widely available, but its unreactive nature is a challenge when attempting to functionalize it under mild conditions with other widely available substrates (such as carbon monoxide, CO) to produce value-added compounds. Biological N2 fixation can do this, but the industrial Haber-Bosch process for ammonia production operates under harsh conditions (450 degrees Celsius and 300 bar), even though both processes are thought to involve multimetallic catalytic sites. And although molecular complexes capable of binding and even reducing N2 under mild conditions are known, with co-operativity between metal centres considered crucial for the N2 reduction step, the multimetallic species involved are usually not well defined, and further transformation of N2-binding complexes to achieve N-H or N-C bond formation is rare...
July 19, 2017: Nature
https://www.readbyqxmd.com/read/28726697/removing-lead-ions-from-aqueous-solutions-by-the-thiosemicarbazide-grafted-multi-walled-carbon-nanotubes
#13
Ying Zhou, Jingang Yu, Xinyu Jiang
A novel multi-walled carbon nanotubes (MWCNTs) material functionalized with thiosemicarbazide was synthesized successfully and used to remove lead ions from aqueous solutions. The technologies of Fourier Transform Infrared Spectroscopy, scanning electron microscopy and thermal gravimetric analysis were used to characterize the structure and properties of thiosemicarbazide grafted MWCNTs. The adsorption conditions, such as pH, contact time and temperature, were investigated. The results showed pH affected the adsorption process greatly, and the adsorption process reached equilibrium within 60 min...
July 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28726353/spin-singlet-quantum-ground-state-in-zig-zag-spin-ladder-cu-cf3coo-2
#14
Igor L Danilovich, Elena V Karpova, Igor V Morozov, Alexey V Ushakov, Sergey V Streltsov, Alexander A Shakin, Olga S Volkova, Elena A Zvereva, Alexander Vasiliev
The copper salt of trifluoroacetic acid Cu(CF3COO)2 offer new platform to investigate the quantum ground states of low-dimensional magnets. In practice, it realizes the ideal case of solid hosting essentially isolated magnetic monolayers. These entities are constituted by well separated two-leg half-integer spin ladders organized in zig-zag fashion. The ladders are comprised by dimeric units of edge-sharing tetragonal pyramids coupled through carbon ions. The spin-gapped state in this compound was revealed by static and dynamic magnetic measurements...
July 20, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28725000/trivalent-y-3-ionic-sensor-development-based-on-e-methyl-n-nitrobenzylidene-benzenesulfonohydrazide-mnbbsh-derivatives-modified-with-nafion-matrix
#15
Mohammad Musarraf Hussain, Mohammed M Rahman, Muhammad Nadeem Arshad, Abdullah M Asiri
(E)-Methyl-N'-nitrobenzylidene-benzenesulfonohydrazide (MNBBSH) compounds were synthesized using a condensation procedure from the derivatives of nitrobenzaldehyde and 4-Methyl-benzenesulfonylhydrazine, which crystallized in ethanol and methanol as well as characterized by FTIR, UV-Vis, (1)H-NMR, and (13)C-NMR. MNBBSH structure was confirmed using a single crystal X-ray diffraction technique and used for the detection of selective yttrium ion (Y(3+)) by I-V system. A thin layer of MNBBSH was deposited onto a glassy carbon electrode (GCE) with 5% nafion for the sensitive and selective Y(3+) sensor...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28724265/facile-synthesis-of-sio2-c-nanoparticles-anchored-on-mwnt-as-high-performance-anode-materials-for-li-ion-batteries
#16
Yan Zhao, Zhengjun Liu, Yongguang Zhang, Almagul Mentbayeva, Xin Wang, M Yu Maximov, Baoxi Liu, Zhumabay Bakenov, Fuxing Yin
Carbon-coated silica nanoparticles anchored on multi-walled carbon nanotubes (SiO2@C/MWNT composite) were synthesized via a simple and facile sol-gel method followed by heat treatment. Scanning and transmission electron microscopy (SEM and TEM) studies confirmed densely anchoring the carbon-coated SiO2 nanoparticles onto a flexible MWNT conductive network, which facilitated fast electron and lithium-ion transport and improved structural stability of the composite. As prepared, ternary composite anode showed superior cyclability and rate capability compared to a carbon-coated silica counterpart without MWNT (SiO2@C)...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28724191/n-s-co-doped-3d-porous-carbon-nanosheet-networks-enhancing-anode-performance-of-sodium-ion-batteries
#17
Lei Zou, Yanqing Lai, Hongxing Hu, Mengran Wang, Kai Zhang, Peng Zhang, Jing Fang, Jie Li
A facile and scalable method has been realized for the in-situ synthesis of N/S co-doping 3D porous carbon nanosheet networks (NSPCNN) as sodium-ion battery anode material. During the synthesis, NaCl is used for a template to prepare porous carbon nanosheet networks. In the resultant architecture, the unique 3D porous architecture ensures large specific surface area and fast diffusion path of both electrons and ions. Meanwhile, the import of N/S produces abundant defects, increased interlayer space, more active sites and high electronic conductivity...
July 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28723154/interruption-of-hydrogen-bonding-networks-of-water-in-carbon-nanotubes-due-to-strong-hydration-shell-formation
#18
Yoshifumi Oya, Kenji Hata, Tomonori Ohba
We present the structures of NaCl aqueous solution in carbon nanotubes with diameters of 1, 2, and 3 nm based on an analysis performed using X-ray diffraction and canonical ensemble Monte Carlo simulations. Anomalously longer nearest-neighbor distances were observed in the electrolyte for the 1-nm-diameter carbon nanotubes; in contrast, in the 2 and 3 nm carbon nanotubes, the nearest-neighbor distances were shorter than those in the bulk electrolyte. We also observed similar properties for water in carbon nanotubes, which was expected because the main component of the electrolyte was water...
July 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28723066/antimony-anchored-with-nitrogen-doping-porous-carbon-as-high-performance-anode-materials-for-na-ion-batteries
#19
Tianjing Wu, Hongshuai Hou, Chenyang Zhang, Peng Ge, Zhaodong Huang, Mingjun Jing, Xiaoqing Qiu, Xiaobo Ji
Antimony represents a class of unique functional materials in sodium-ion batteries with high theoretical capacity (660 mAh g-1). The utilization of carbonaceous materials as buffer layer has been considered as an effective approach to alleviate rapid capacity fading. Herein, the antimony/nitrogen-doping porous carbon (Sb/NPC) composite with polyaniline nanosheets as carbon source has been successfully achieved. And, our strategy involves three processes-tunable organic polyreaction, thermal annealing process and cost-effective reduction reaction...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28722318/porous-carbon-nanofibers-encapsulated-with-peapod-like-hematite-nanoparticles-for-high-rate-and-long-life-battery-anodes
#20
Guanglin Xia, Qili Gao, Dalin Sun, Xuebin Yu
Fe2 O3 is regarded as a promising anode material for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) due to its high specific capacity. The large volume change during discharge and charge processes, however, induces significant cracking of the Fe2 O3 anodes, leading to rapid fading of the capacity. Herein, a novel peapod-like nanostructured material, consisting of Fe2 O3 nanoparticles homogeneously encapsulated in the hollow interior of N-doped porous carbon nanofibers, as a high-performance anode material is reported...
July 19, 2017: Small
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