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https://www.readbyqxmd.com/read/28438014/characterization-of-a-glutamate-decarboxylase-gad-from-enterococcus-avium-m5-isolated-from-jeotgal-a-fermented-korean-sea-food
#1
Kang Wook Lee, Jae Min Shim, Zhuang Yao, Jeong A Kim, Hyun-Jin Kim, Jeong Hwan Kim
To develop starters for the production of functional foods or materials, lactic acid bacteria producing γ-aminobutyric acid (GABA) were screened from jeotgals, Korean fermented sea foods. One isolate producing high amount of GABA from monosodium L-glutamate (MSG) was identified as Enterococcus avium by 16S rRNA gene sequencing. E. avium M5 produced 18.47 ± 1.26 mg/ml GABA when incubated for 48 h at 37°C in MRS broth with MSG (3%, w/v). A gadB gene encoding glutamate decarboxylase (GAD) was cloned and overexpressed in E...
April 25, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28438010/study-on-crystallographic-orientation-effect-on-surface-generation-of-aluminum-in-nano-cutting
#2
Feifei Xu, Fengzhou Fang, Yuanqing Zhu, Xiaodong Zhang
The material characteristics such as size effect are one of the most important factors that could not be neglected in cutting the material at nanoscale. The effects of anisotropic nature of single crystal materials in nano-cutting are investigated employing the molecular dynamics simulation. Results show that the size effect of the plastic deformation is based on different plastic carriers, such as the twin, stacking faults, and dislocations. The minimum uncut chip thickness is dependent on cutting direction, where even a negative value is obtained when the cutting direction is {110}<001>...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28438007/high-speed-cleaving-of-crystals-with-ultrafast-bessel-beams
#3
L Rapp, R Meyer, L Furfaro, C Billet, R Giust, F Courvoisier
We develop a novel concept for ultra-high speed cleaving of crystalline materials with femtosecond lasers. Using Bessel beams in single shot, fracture planes can be induced nearly all along the Bessel zone in sapphire. For the first time, we show that only for a pulse duration below 650 fs, a single fracture can be induced in sapphire, while above this duration, cracks appear in all crystallographic orientations. We determine the influential parameters which are polarization direction, crystallographic axes and scanning direction...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437986/control-and-design-heat-flux-bending-in-thermal-devices-with-transformation-optics
#4
Guoqiang Xu, Haochun Zhang, Yan Jin, Sen Li, Yao Li
We propose a fundamental latent function of control heat transfer and heat flux density vectors at random positions on thermal materials by applying transformation optics. The expressions for heat flux bending are obtained, and the factors influencing them are investigated in both 2D and 3D cloaking schemes. Under certain conditions, more than one degree of freedom of heat flux bending exists corresponding to the temperature gradients of the 3D domain. The heat flux path can be controlled in random space based on the geometrical azimuths, radial positions, and thermal conductivity ratios of the selected materials...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437977/polymer-optical-fiber-bragg-grating-inscription-with-a-single-uv-laser-pulse
#5
A Pospori, C A F Marques, O Bang, D J Webb, P André
We experimentally demonstrate the first polymer optical fiber Bragg grating inscribed with only one krypton fluoride laser pulse. The device has been recorded in a single-mode poly(methyl methacrylate) optical fiber, with a core doped with benzyl dimethyl ketal for photosensitivity enhancement. One laser pulse with a duration of 15 ns, which provide energy density of 974 mJ/cm<sup>2</sup>, is adequate to introduce a refractive index change of 0.74×10<sup>-4</sup> in the fiber core. After the exposure, the reflectivity of the grating increases for a few minutes following a second order exponential saturation...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437963/raman-gain-and-femtosecond-laser-induced-damage-of-ge-as-s-chalcogenide-glasses
#6
Yan Zhang, Yinsheng Xu, Chenyang You, Dong Xu, Junzhou Tang, Peiqing Zhang, Shixun Dai
Chemical stoichiometric Ge-As-S glasses were prepared, and their thermal properties, refractive index (n), optical bandgap, Raman gain, and femtosecond laser damage were examined. Results revealed that the n and density (ρ) of the glasses decreased as Ge concentration increased, whereas the bandgap and glass transition temperature (Tg) increased. The Raman gain coefficients (g<sub>R</sub>) of the samples were calculated on the basis of spontaneous Raman scattering spectra. g<sub>R</sub> decreased from 2...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437957/widely-wavelength-tunable-gain-switched-er-sup-3-sup-doped-zblan-fiber-laser-around-2-8-%C3%AE-m
#7
Chen Wei, Hongyu Luo, Hongxia Shi, YanJia Lyu, Han Zhang, Yong Liu
In this paper, we demonstrate a wavelength widely tunable gain-switched Er<sup>3+</sup>-doped ZBLAN fiber laser around 2.8 μm. The laser can be tuned over 170 nm (2699 nm~2869.9 nm) for various pump power levels, while maintaining stable μs-level single-pulse gain-switched operation with controllable output pulse duration at a selectable repetition rate. To the best of our knowledge, this is the first wavelength tunable gain-switched fiber laser in the 3 μm spectral region with the broadest tuning range (doubling the record tuning range) of the pulsed fiber lasers around 3 μm...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437938/focus-issue-introduction-advanced-solid-state-lasers-assl-2016
#8
Yoonchan Jeong, Christian Kränkel, Almantas Galvanauskas, Kenneth Schepler, Takunori Taira, Shibin Jiang
The editors introduce the focus issue on "Advanced Solid-State Lasers (ASSL) 2016", which is based on the topics presented at a conference of the same name held in Boston, USA, from October 30 to November 3, 2016. This focus issue, jointly prepared by Optics Express and Optical Materials Express, includes 20 contributed papers (14 for Optics Express and 6 for Optical Materials Express) selected from the voluntary submissions from attendees who presented at the conference and have extended their work into complete research articles...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437935/terahertz-artificial-material-based-on-integrated-metal-rod-array-for-phase-sensitive-fluid-detection
#9
Borwen You, Ching-Yu Chen, Chin-Ping Yu, Tze-An Liu, Toshiaki Hattori, Ja-Yu Lu
A terahertz artificial material composed of metal rod array is experimentally investigated on its transmission spectral property and successfully incorporated into microfluidics as a miniaturized terahertz waveguide with an extended optical-path-length for label-free fluidic sensing. Theoretical and experimental characterizations of terahertz transmission spectra show that the wave guidance along the metal rod array originates from the resonance of transverse-electric-polarized waves within the metal rod slits...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437933/optical-wave-parameters-for-spatially-dispersive-and-anisotropic-nanomaterials
#10
Andriy Shevchenko, Markus Nyman, Ville Kivijärvi, Matti Kaivola
Spatial dispersion is an intriguing property of essentially all nanostructured optical media. In particular, it makes optical waves with equal frequencies and polarizations have different wavelengths, if they propagate in different directions. This can offer new approaches to control light radiation and propagation. Spatially dispersive nanomaterials, such as metamaterials, are often treated in terms of wave parameters, such as refractive index and impedance retrieved from reflection and transmission coefficients of the material at each incidence angle...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437928/terahertz-optical-bistability-of-graphene-in-thin-layers-of-dielectrics
#11
Kwang Jun Ahn, Fabian Rotermund
We theoretically studied in terahertz frequency regime optical bistability of graphene placed at the interface between thin dielectric layers. We solved self-consistently the nonlinear wave equations containing the third-order optical conductivity of graphene in four-layer structures and obtained hysteresis response of the transmitted power as a function of the incident power. We numerically observed that the critical powers for the up and down transitions and the Fermi-energy of graphene required for terahertz optical bistability can be reduced by carefully choosing material properties and the thicknesses of dielectric layers...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437925/back-contacted-basi-sub-2-sub-solar-cells-an-optical-study
#12
Robin Vismara, Olindo Isabella, Miro Zeman
We present the optical investigation of a novel back-contacted architecture for solar cells based on a thin barium (di)silicide (BaSi<sub>2</sub>) absorber. First, through the analysis of absorption limits of different semiconducting materials, we show the potential of BaSi<sub>2</sub> for photovoltaic applications. Then, the proposed back contacted BaSi<sub>2</sub> solar cell design is investigated and optimized. An implied photocurrent density of 40.3 mA/cm<sup>2</sup> in a 1-μm thick absorber was achieved, paving the way for novel BaSi<sub>2</sub>-based thin-film solar cells...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437918/modeling-and-designing-multilayer-2d-perovskite-silicon-bifacial-tandem-photovoltaics-for-high-efficiencies-and-long-term-stability
#13
Haejun Chung, Xingshu Sun, Aditya D Mohite, Rahul Singh, Lokendra Kumar, Muhammad A Alam, Peter Bermel
A key challenge in photovoltaics today is to develop cell technologies with both higher efficiencies and lower fabrication costs than incumbent crystalline silicon (c-Si) single-junction cells. While tandem cells have higher efficiencies than c-Si alone, it is generally challenging to find a low-cost, high-performance material to pair with c-Si. However, the recent emergence of 22% efficient perovskite photovoltaics has created a tremendous opportunity for high-performance, low-cost perovskite / crystalline silicon tandem photovoltaic cells...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437816/-subjective-level-of-information-and-information-needs-of-patients-with-an-approved-rehabilitation-application-and-patients-at-the-end-of-rehabilitation-results-of-a-written-survey
#14
Anna Lena Walther, Dora Schreiber, Johannes Falk, Ruth Deck
AimThe aim of the study was to identify the subjective level of information and information needs of patients with an approved rehabilitation application and patients at the end of rehabilitation with regard to preferred subjects and kind of information transfer. Method Written survey with N=283 patients with approved rehabilitation application and N=388 patients at the end of rehabilitation. ResultsBoth groups reported high information needs particularly regarding treatments during rehabilitation, rehabilitation aftercare and rehabilitation aims...
April 24, 2017: Die Rehabilitation
https://www.readbyqxmd.com/read/28437812/infection-rate-in-1033-elective-neurosurgical-procedures-at-a-university-hospital-in-south-china
#15
Hongwei Zhu, Xiyao Liu, Zhanxiang Wang
Objective Infection following surgery is a serious complication, especially in neurosurgery. The aim of the study is to report the change of incidence rates of infection in patients undergoing elective neurosurgical procedures at a university hospital in South China as well as the risk factors. Material and Methods The medical records and postoperative courses for patients undergoing 1,033 neurosurgical procedures from 2008 to 2014 were reviewed retrospectively to determine the incidence of neurosurgical infection, the identity of the offending organisms, and the factors associated with infection...
April 24, 2017: Journal of Neurological Surgery. Part A, Central European Neurosurgery
https://www.readbyqxmd.com/read/28437803/prevalence-of-helicobacter-pylori-infection-among-blood-donors-in-saxony-anhalt-germany-a-region-at-intermediate-risk-for-gastric-cancer
#16
Caspar Franck, Armin Hoffmann, Alexander Link, Christian Schulz, Kerstin Wuttig, Elke Becker, Marcell Heim, Marino Venerito, Peter Malfertheiner
Background In the federal state of Saxony-Anhalt, gastric cancer (GC) incidence ranks among the highest in Germany. Helicobacter pylori prevalence is a surrogate marker for GC risk in a given population. In 2010 we reported an H. pylori seroprevalence of 44.4 % in patients at the emergency ward of the University Hospital of Magdeburg, the capital of Saxony-Anhalt. Our aim is to update these findings in a cohort of healthy blood donors from the same region. Materials and methods The sera of 516 consecutive blood donors (40...
April 24, 2017: Zeitschrift Für Gastroenterologie
https://www.readbyqxmd.com/read/28437762/public-attitudes-toward-depression-and-help-seeking-impact-of-the-ospi-europe-depression-awareness-campaign-in-four-european-regions
#17
Elisabeth Kohls, Evelien Coppens, Juliane Hug, Eline Wittevrongel, Chantal Van Audenhove, Nicole Koburger, Ella Arensman, András Székely, Ricardo Gusmão, Ulrich Hegerl
BACKGROUND: Public attitudes toward depression and help-seeking behaviour are important factors influencing depressed people to obtain professional help and adequate treatment. OSPI-Europe is a multi-level suicide prevention programme including a public awareness campaign. It was implemented in four regions of four European countries (Germany, Hungary, Ireland and Portugal). This paper reports the results of the evaluation of the campaign, including its visibility and effects of the campaign on stigma associated with depression and help-seeking behaviour...
April 8, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28437740/stabilization-of-metal-loid-s-in-two-contaminated-agricultural-soils-comparing-biochar-to-its-non-pyrolysed-source-material
#18
Lukáš Trakal, Irene Raya-Moreno, Kerry Mitchell, Luke Beesley
Two metal(loid) contaminated agricultural soils were amended with grape stalk (wine production by-product)-derived biochar as well as its pre-pyrolysed origin material, to investigate their geochemical impacts on As, Cr, Cu and Zn. Detailed physico-chemical evaluation combined with a column leaching test determined the retention of metal(loid)s from soil solution by each amendments. A pot experiment measured metal(loid)s in soil pore water and their uptake to ryegrass when the amendments were mixed into soils at 1 and 5% (w/w)...
April 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/28437724/synthesis-of-zno-nanorod-based-materials-for-antibacterial-antifungal-activities-dna-cleavage-and-efficient-ultrasound-assisted-dyes-adsorption
#19
Ali Akbar Bazrafshan, Mehrorang Ghaedi, Shaaker Hajati, Reza Naghiha, Arash Asfaram
Undoped and Au-doped ZnO-nanorods were synthesized in the presence of ultrasound and loaded on activated carbon following characterization by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmittance electron microscopy (TEM), UV-vis spectrophotometry and Fourier transform infrared spectroscopy (FTIR). The Au-doped ZnO-nanorod-loaded activated carbon (Au-ZnO-NRs-AC) was used for the simultaneous removal of methylene blue (MB) and auramine O (AO) from aqueous solutions. Central composite design (CCD) under response surface methodology (RSM) was applied to model and optimize the dyes removal versus adsorbent mass, pH, and initial dyes concentration and sonication time as well as to investigate the possible interaction between these variables...
April 21, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28437707/effect-of-pco2-on-direct-flue-gas-mineral-carbonation-at-pilot-scale
#20
Ikbel Mouedhen, Nassima Kemache, Louis-César Pasquier, Emmanuelle Cecchi, Jean-François Blais, Guy Mercier
Concerns about global warming phenomena induced the development of research about the control of anthropogenic greenhouse gases emissions. The current work studies on the scaling up of aqueous mineral carbonation route to reduce the CO2 emissions at the chimney of industrial emitters. The reactivity of serpentinite in a stirred tank reactor was studied for several partial pressures of CO2 (pCO2) (0.4, 0.7, 1.3 and 1.6 bar). Prior to carbonation, the feedstock was finely grinded and dehydroxyled at 650 °C by a thermal treatment...
April 21, 2017: Journal of Environmental Management
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