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[PMID]: 29515180
[Au] Autor:Yang Q; Wang L; Zhou Z; Wang L; Zhang Y; Zhao S; Dong G; Cheng Y; Min T; Hu Z; Chen W; Xia K; Liu M
[Ad] Address:Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi'an Jiaotong University, 710049, Xi'an, China.
[Ti] Title:Ionic liquid gating control of RKKY interaction in FeCoB/Ru/FeCoB and (Pt/Co) /Ru/(Co/Pt) multilayers.
[So] Source:Nat Commun;9(1):991, 2018 Mar 07.
[Is] ISSN:2041-1723
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:To overcome the fundamental challenge of the weak natural response of antiferromagnetic materials under a magnetic field, voltage manipulation of antiferromagnetic interaction is developed to realize ultrafast, high-density, and power efficient antiferromagnetic spintronics. Here, we report a low voltage modulation of Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction via ionic liquid gating in synthetic antiferromagnetic multilayers of FeCoB/Ru/FeCoB and (Pt/Co) /Ru/(Co/Pt) . At room temperature, the distinct voltage control of transition between antiferromagnetic and ferromagnetic ordering is realized and up to 80% of perpendicular magnetic moments manage to switch with a small-applied voltage bias of 2.5 V. We related this ionic liquid gating-induced RKKY interaction modification to the disturbance of itinerant electrons inside synthetic antiferromagnetic heterostructure and the corresponding change of its Fermi level. Voltage tuning of RKKY interaction may enable the next generation of switchable spintronics between antiferromagnetic and ferromagnetic modes with both fundamental and practical perspectives.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180311
[Lr] Last revision date:180311
[St] Status:In-Data-Review
[do] DOI:10.1038/s41467-018-03356-z

  2 / 52235 MEDLINE  
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[PMID]: 29511164
[Au] Autor:Cirelli C; Marante C; Heuser S; Petersson CLM; Galán ÁJ; Argenti L; Zhong S; Busto D; Isinger M; Nandi S; Maclot S; Rading L; Johnsson P; Gisselbrecht M; Lucchini M; Gallmann L; Dahlström JM; Lindroth E; L'Huillier A; Martín F; Keller U
[Ad] Address:Physics Department, ETH Zurich, 8093, Zurich, Switzerland. claudio.cirelli@psi.ch.
[Ti] Title:Anisotropic photoemission time delays close to a Fano resonance.
[So] Source:Nat Commun;9(1):955, 2018 Mar 06.
[Is] ISSN:2041-1723
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:Electron correlation and multielectron effects are fundamental interactions that govern many physical and chemical processes in atomic, molecular and solid state systems. The process of autoionization, induced by resonant excitation of electrons into discrete states present in the spectral continuum of atomic and molecular targets, is mediated by electron correlation. Here we investigate the attosecond photoemission dynamics in argon in the 20-40 eV spectral range, in the vicinity of the 3s np autoionizing resonances. We present measurements of the differential photoionization cross section and extract energy and angle-dependent atomic time delays with an attosecond interferometric method. With the support of a theoretical model, we are able to attribute a large part of the measured time delay anisotropy to the presence of autoionizing resonances, which not only distort the phase of the emitted photoelectron wave packet but also introduce an angular dependence.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180311
[Lr] Last revision date:180311
[St] Status:In-Data-Review
[do] DOI:10.1038/s41467-018-03009-1

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[PMID]: 29499184
[Au] Autor:Yamagiwa R; Kurahashi T; Takeda M; Adachi M; Nakamura H; Arai H; Shiro Y; Sawai H; Tosha T
[Ad] Address:Graduate School of Life Science, University of Hyogo, Hyogo 678-1297, Japan; RIKEN SPring-8 Center, Kouto, Sayo, Hyogo 679-5148, Japan.
[Ti] Title:Pseudomonas aeruginosa overexpression system of nitric oxide reductase for in vivo and in vitro mutational analyses.
[So] Source:Biochim Biophys Acta;1859(5):333-341, 2018 Feb 27.
[Is] ISSN:0006-3002
[Cp] Country of publication:Netherlands
[La] Language:eng
[Ab] Abstract:Membrane-integrated nitric oxide reductase (NOR) reduces nitric oxide (NO) to nitrous oxide (N O) with protons and electrons. This process is essential for the elimination of the cytotoxic NO that is produced from nitrite (NO ) during microbial denitrification. A structure-guided mutagenesis of NOR is required to elucidate the mechanism for NOR-catalyzed NO reduction. We have already solved the crystal structure of cytochrome c-dependent NOR (cNOR) from Pseudomonas aeruginosa. In this study, we then constructed its expression system using cNOR-gene deficient and wild-type strains for further functional study. Characterizing the variants of the five conserved Glu residues located around the heme/non-heme iron active center allowed us to establish how the anaerobic growth rate of cNOR-deficient strains expressing cNOR variants correlates with the in vitro enzymatic activity of the variants. Since bacterial strains require active cNOR to eliminate cytotoxic NO and to survive under denitrification conditions, the anaerobic growth rate of a strain with a cNOR variant is a good indicator of NO decomposition capability of the variants and a marker for the screening of functionally important residues without protein purification. Using this in vivo screening system, we examined the residues lining the putative proton transfer pathways for NO reduction in cNOR, and found that the catalytic protons are likely transferred through the Glu57 located at the periplasmic protein surface. The homologous cNOR expression system developed here is an invaluable tool for facile identification of crucial residues in vivo, and for further in vitro functional and structural studies.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180310
[Lr] Last revision date:180310
[St] Status:Publisher

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[PMID]: 29491420
[Au] Autor:Alharbi A; Boguslavskiy AE; Austin D; Thiré N; Wood D; Hawkins P; McGrath F; Johnson AS; Lopez-Quintas I; Schmidt B; Légaré F; Marangos JP; Le AT; Bhardwaj R
[Ad] Address:Department of Physics, Advanced Research Complex, University of Ottawa, 25 Templeton Street, Ottawa, K1N6N5, Ontario, Canada.
[Ti] Title:Femtosecond Laser Mass Spectrometry and High Harmonic Spectroscopy of Xylene Isomers.
[So] Source:Sci Rep;8(1):3789, 2018 Feb 28.
[Is] ISSN:2045-2322
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:Structural isomers, molecules having the same chemical formula but with atoms bonded in different order, are hard to identify using conventional spectroscopy and mass spectrometry. They exhibit virtually indistinguishable mass spectra when ionized by electrons. Laser mass spectrometry based on photoionization of the isomers has emerged as a promising alternative but requires shaped ultrafast laser pulses. Here we use transform limited femtosecond pulses to distinguish the isomers using two methods. First, we probe doubly charged parent ions with circularly polarized light. We show that the yield of doubly charged ortho-xylene decreases while para-xylene increases over a range of laser intensities when the laser polarization is changed from linear to circular. Second, we probe high harmonic generation from randomly oriented isomer molecules subjected to an intense laser field. We show that the yield of high-order harmonics varies with the positioning of the methyl group in xylene isomers (ortho-, para- and meta-) and is due to differences in the strength of tunnel ionization and the overlap between the angular peaks of ionization and photo-recombination.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180311
[Lr] Last revision date:180311
[St] Status:In-Data-Review
[do] DOI:10.1038/s41598-018-22055-9

  5 / 52235 MEDLINE  
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[PMID]: 29482161
[Au] Autor:Yang Q; Wang L; He J; Yang Z; Huang X
[Ad] Address:National and Local Joint Engineering Research Center of Biomedical Functional Materials, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Sciences, Nanjing Normal University, Nanjing 210046, China.
[Ti] Title:Direct imaging of how lanthanides break the normal evolution of plants.
[So] Source:J Inorg Biochem;182:158-169, 2018 Feb 10.
[Is] ISSN:1873-3344
[Cp] Country of publication:United States
[La] Language:eng
[Ab] Abstract:After rare earth elements [REE(III)] are anchored outside of the plasma membrane, REE(III) break plant evolution to initiate leaf cell endocytosis, which finally affects plant growth. However, the molecule for anchoring REE(III) in the acidic environment outside of the plasma membrane is not clear, which is crucial for exploring the mechanism of REE(III) breaking plant evolution. Here, lanthanum(III) [La(III)] and terbium(III) [Tb(III)] were respectively served as a representative of REE(III) without and with f electrons, and Arabidopsis was served as a representative of plants, cellular and molecular basis for arabinogalactan proteins (AGP) anchoring REE(III) outside of the plasma membrane was investigated. By using interdisciplinary methods, when REE(III) initiated leaf cell phagocytosis, we observed the increase in the expression of AGP and their migration to the outside of the plasma membrane. In the acidic environment outside of the plasma membrane, Tb(III) formed more stable Lewis acid-base [REE(III)-AGP] complexes with a higher apparent binding constant (1.51 × 10 ) than La(III) (1.24 × 10 ). In REE(III)-AGP complexes, the bond lengths of REE(III)-O were in normal range and H-bonds were strong H-bonds. The formation of REE(III)-AGP complexes sequentially disturbed the secondary and tertiary structure of AGP, which were enhanced with increasing the concentration of REE(III), and Tb(III) caused stronger structural changes than La(III). Hence, AGP could be molecules for anchoring REE(III) outside of the plasma membrane. The results of this study are direct imaging of how lanthanides break the normal evolution of plants, and can serve as an important guidance for investigating mechanism of lanthanides in organisms.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1802
[Cu] Class update date: 180310
[Lr] Last revision date:180310
[St] Status:Publisher

  6 / 52235 MEDLINE  
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[PMID]: 29524212
[Au] Autor:Ren J; Zhang G; Wang D; Han J; Wu Z; Cai D
[Ad] Address:the Inst. of Physical Science and Information Technology, Anhui Univ., Hefei 230601, People's Republic of China.
[Ti] Title:One-Step and Nondestructive Reduction of Cr(VI) in Pork by High-Energy Electron Beam Irradiation.
[So] Source:J Food Sci;, 2018 Mar 10.
[Is] ISSN:1750-3841
[Cp] Country of publication:United States
[La] Language:eng
[Ab] Abstract:Because of the wide use of chromium-containing feed, much hexavalent chromium (Cr(VI)) tends to accumulate in pork. In order to decrease the toxicity of Cr(VI)-containing pork for human beings, high-energy electron beam (HEEB) irradiation was used to reduce highly toxic Cr(VI) to low toxic trivalent chromium (Cr(III)) in lean, fat, and marbled pork. HEEB irradiation could efficiently and nondestructively reduce both free and adsorbed Cr(VI) in pork, achieving the highest reductive efficiency (RE) of 98.03%. Therein, hydrated electrons (e ) and hydrogen radical (•H) generated during the irradiation process probably played key roles in the reduction. The effects of irradiation dose, initial concentration of Cr(VI), pH, temperature, salinity, and oil on the RE were investigated to obtain the optimal reduction conditions, proving the high universality of this approach. This work provides a clean and low-cost method for removing Cr(VI) from pork, which is important to ensure food safety. PRACTICAL APPLICATION: This work describes a facile, nondestructive, and clean method for removing Cr(VI) from meat product, which may have a potential application prospect in ensuring food quality and safety.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180310
[Lr] Last revision date:180310
[St] Status:Publisher
[do] DOI:10.1111/1750-3841.14088

  7 / 52235 MEDLINE  
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[PMID]: 29522319
[Au] Autor:Sheng H; Oh M; Osowiecki WT; Kim W; Alivisatos AP; Frei H
[Ti] Title:Carbon Dioxide Dimer Radical Anion as Surface Intermediate of Photo-Induced CO2 Reduction at Aqueous Cu and CdSe Nanoparticle Catalysts by Rapid-Scan FT-IR Spectroscopy.
[So] Source:J Am Chem Soc;, 2018 Mar 09.
[Is] ISSN:1520-5126
[Cp] Country of publication:United States
[La] Language:eng
[Ab] Abstract:Monitoring of visible light sensitized reduction of CO2 at Cu nanoparticles in aqueous solution by rapid-scan ATR FT-IR spectroscopy on the time scale of seconds allowed structural identification of a one-electron intermediate and demonstrated its kinetic relevancy for the first time. Isotopic labelling (12C: 1632, 1358, 1346 cm-1; 13C: 1588, 1326, 1316 cm-1) revealed a species of carbon dioxide dimer radical anion structure, most likely bound to the catalyst surface through carbon. Intermediacy of Cu-C(=O)OCO2- surface species is in agreement with a recently proposed mechanism for eletrocatalytic CO2 reduction at Cu metal nanoparticles based on Tafel slope analysis. Spontaneous decrease of the intermediate after termination of the photosensitization pulse (Sn porphyrin excited at 405 nm) was accompanied by the growth of HCO3-. CO was produced as well, but sensitive detection required photolysis for tens of minutes. A direct kinetic link between a C2O4- surface intermediate and the CO product was also demonstrated for photocatalyzed CO2 reduction at aqueous CdSe nanoparticles, where first order growth of a Cd-C(=O)OCO2- species was accompanied by rise of CO (monitored by a fast Ni complex trap) and HCO3- showing a distinct induction period. The detection of the one-electron surface intermediate and confirmation of its catalytic relevancy was enabled by the delivery of electrons one-by-one by the photosensitization method. The observation of carbon dioxide dimer radical anion points to approaches for rate enhancements of heterogeneous CO2 reduction by creating catalytic environments that favor formation of this intermediate.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1803
[Cu] Class update date: 180309
[Lr] Last revision date:180309
[St] Status:Publisher
[do] DOI:10.1021/jacs.8b00271

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[PMID]: 29434203
[Au] Autor:Iwata N; Kojima S; Sentoku Y; Hata M; Mima K
[Ad] Address:Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka, 565-0871, Japan. iwata-n@ile.osaka-u.ac.jp.
[Ti] Title:Plasma density limits for hole boring by intense laser pulses.
[So] Source:Nat Commun;9(1):623, 2018 02 12.
[Is] ISSN:2041-1723
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:High-power lasers in the relativistic intensity regime with multi-picosecond pulse durations are available in many laboratories around the world. Laser pulses at these intensities reach giga-bar level radiation pressures, which can push the plasma critical surface where laser light is reflected. This process is referred to as the laser hole boring (HB), which is critical for plasma heating, hence essential for laser-based applications. Here we derive the limit density for HB, which is the maximum plasma density the laser can reach, as a function of laser intensity. The time scale for when the laser pulse reaches the limit density is also derived. These theories are confirmed by a series of particle-in-cell simulations. After reaching the limit density, the plasma starts to blowout back toward the laser, and is accompanied by copious superthermal electrons; therefore, the electron energy can be determined by varying the laser pulse length.
[Pt] Publication type:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Entry month:1802
[Cu] Class update date: 180309
[Lr] Last revision date:180309
[St] Status:In-Process
[do] DOI:10.1038/s41467-018-02829-5

  9 / 52235 MEDLINE  
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[PMID]: 29378161
[Au] Autor:Wiegand K; Winkler M; Rumpel S; Kannchen D; Rexroth S; Hase T; Farès C; Happe T; Lubitz W; Rögner M
[Ad] Address:Plant Biochemistry, Faculty of Biology & Biotechnology, Ruhr University Bochum, 44780 Bochum, Germany.
[Ti] Title:Rational redesign of the ferredoxin-NADP -oxido-reductase/ferredoxin-interaction for photosynthesis-dependent H -production.
[So] Source:Biochim Biophys Acta;1859(4):253-262, 2018 Jan 31.
[Is] ISSN:0006-3002
[Cp] Country of publication:Netherlands
[La] Language:eng
[Ab] Abstract:Utilization of electrons from the photosynthetic water splitting reaction for the generation of biofuels, commodities as well as application in biotransformations requires a partial rerouting of the photosynthetic electron transport chain. Due to its rather negative redox potential and its bifurcational function, ferredoxin at the acceptor side of Photosystem 1 is one of the focal points for such an engineering. With hydrogen production as model system, we show here the impact and potential of redox partner design involving ferredoxin (Fd), ferredoxin-oxido-reductase (FNR) and [FeFe]­hydrogenase HydA1 on electron transport in a future cyanobacterial design cell of Synechocystis PCC 6803. X-ray-structure-based rational design and the allocation of specific interaction residues by NMR-analysis led to the construction of Fd- and FNR-mutants, which in appropriate combination enabled an about 18-fold enhanced electron flow from Fd to HydA1 (in competition with equimolar amounts of FNR) in in vitro assays. The negative impact of these mutations on the Fd-FNR electron transport which indirectly facilitates H production (with a contribution of ≤42% by FNR variants and ≤23% by Fd-variants) and the direct positive impact on the Fd-HydA1 electron transport (≤23% by Fd-mutants) provide an excellent basis for the construction of a hydrogen-producing design cell and the study of photosynthetic efficiency-optimization with cyanobacteria.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1801
[Cu] Class update date: 180309
[Lr] Last revision date:180309
[St] Status:Publisher

  10 / 52235 MEDLINE  
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[PMID]: 29175401
[Au] Autor:Wan J; Du X; Wang R; Liu E; Jia J; Bai X; Hu X; Fan J
[Ad] Address:School of Chemical Engineering, Northwest University, Xi'an 710069, PR China.
[Ti] Title:Mesoporous nanoplate multi-directional assembled Bi WO for high efficient photocatalytic oxidation of NO.
[So] Source:Chemosphere;193:737-744, 2018 Feb.
[Is] ISSN:1879-1298
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:Herein, a mesoporous nanoplate multi-directional assembled Bi WO architecture was successfully prepared and applied for the photocatalytic removal of NOx pollutants at low concentrations under visible light and simulated solar light irradiation. Bi WO -180-C synthesized at a hydrothermal temperature of 180 °C with calcination exhibited an excellent conversion efficiency in the photocatalytic oxidation of gaseous NO. The crystallinity, morphology, specific surface area, pore environment, light absorption, and separation of photogenerated electrons and holes were investigated by various techniques; the excellent photocatalytic performance of Bi WO -180-C was attributed to its special hierarchical mesoporous structure with an appropriate pore size and interconnected porous network, which imparted good gas permeability and fast mass transfer of reaction intermediates and final products of NO oxidation. Furthermore, hierarchical mesoporous Bi WO showed excellent photocatalytic durability and reusability.
[Mh] MeSH terms primary: Bismuth/chemistry
Catalysis
Nitric Oxide/chemistry
Nitric Oxide/radiation effects
[Mh] MeSH terms secundary: Gases
Light
Oxidants, Photochemical
Oxidation-Reduction
Porosity
[Pt] Publication type:JOURNAL ARTICLE
[Nm] Name of substance:0 (Gases); 0 (Oxidants, Photochemical); 31C4KY9ESH (Nitric Oxide); U015TT5I8H (Bismuth)
[Em] Entry month:1803
[Cu] Class update date: 180309
[Lr] Last revision date:180309
[Js] Journal subset:IM
[Da] Date of entry for processing:171128
[St] Status:MEDLINE


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