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  • 1
    Electronic Resource
    Electronic Resource
    Light-emission properties in nanocrystalline BaTiO3 (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 2807-2809 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This letter reports photoluminescence properties of nanocrystalline BaTiO3. Two intense emission bands centered at 543 and 694 nm and a weak one at 574 nm have been observed at room temperature. The change of luminescence peak with different heat treatments correlates to the evolution of Ti4+ defects in the nanocrystalline BaTiO3 matrice. The light-emission mechanism is explained within the framework of self-trapped excitons by combining quantum-size confinement and dielectric confinement effects. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1322376
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  • 2
    Electronic Resource
    Electronic Resource
    Infrared optical properties of Ba0.8Sr0.2TiO3 ferroelectric thin films (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 3651-3653 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Infrared optical properties of barium strontium titanate Ba0.8Sr0.2TiO3 thin films grown on Pt/Ti/SiO2/Si substrates are studied by infrared spectroscopic ellipsometry (IRSE) in the spectral range of 2.5–12.6 μm. The refractive index and extinction coefficient of Ba0.8Sr0.2TiO3 are determined by fitting the IRSE data using a classical dielectric function formula. As the wavelength increases, the refractive index decreases, but on the contrary, the extinction coefficient increases. The absorption coefficient is greater than 1000 cm−1 for the wavelength over 12.1 μm, but very small and less than 100 cm−1 under 5.3 μm. The effective static ionic charge has also been derived, which is smaller than it would be in a purely ionic material for Ba0.8Sr0.2TiO3 thin films. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1330224
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  • 3
    Electronic Resource
    Electronic Resource
    Observation of terahertz electric pulses generated by nearly filled-gap nonuniform illumination excitation (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 3896-3898 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Terahertz (THz) electric pulses generated by nonuniform illumination excitation in a nearly filled-gap configuration were observed. In this scheme, the excitation beam is focused to a spotsize only slightly smaller than the spacing between the transmission lines and is located symmetrically within the gap. With 100 fs laser pulses excitation on sliding-contact photoconductive switches fabricated on low-temperature-grown GaAs, electric pulse correlation with 190±20 fs full width at half maximum, which corresponds to a 3 dB bandwidth of 1.1 THz, was observed. Moreover, electric pulses with three times larger peak amplitude than those generated with filled-gap illumination from In coplanar striplines were observed. Bias, wavelength, and pump power dependencies were investigated. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1332830
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  • 4
    Electronic Resource
    Electronic Resource
    Fibronectin binding by Propionibacterium acnes (1997)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS immunology and medical microbiology 19 (1997), S. 0 
    Details
    ISSN: 1574-695X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Strains of Propionibacterium acnes, isolated from different kinds of orthopaedic and biomaterial-associated infections and from skin flora were shown to express binding of soluble as well as immobilized fibronectin. Among these 7 strains isolated from orthopaedic infections, 2 from breast prostheses, and 9 skin isolates, 2, 2, and 5 strains respectively bound immobilized fibronectin. The fibronectin binding was sensitive to protease and heat treatment, and was inhibited by a cell surface extract from one of the binding strains. In SDS-PAGE and autoradiography of cell surface extracts, a band corresponding to a MW of about 80 kD reacted with fibronectin and the 150 kD fragment of fibronectin. Binding to fibronectin and the 150 kD fragment of fibronectin could be inhibited with heparin. We thus present a first Fn binding protein of P. acnes, a surface exposed protein of 80 kD. None of the strains bound soluble collagen, and only one strain expressed weak binding of vitronectin and bone sialoprotein II.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-695X.1997.tb01094.x
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  • 5
    Electronic Resource
    Electronic Resource
    Measurement of CO2 and HCO3− fluxes in cyanobacteria and microalgae during steady-state photosynthesis (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 90 (1994), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A mass spectrometric procedure is described which allows the simultaneous estimation of both CO2 and HCO−3 fluxes associated with cyanobacteria and green algae during steady-stale photosynthesis. This technique utilizes the chemical disequilibrium which exists between CO2 and HCO−3 during photosynthesis in cell suspensions which lack carbonic anhydrase activity. The kinetic equations which are derived for flux determinations are based on models of photosynthesis in both cyanobacteria and green algae which seem most reasonable given our present level of understanding, together with direct measurement of [CO2] estimation of [HCO−3] and application of the kinetic rate constants for the interconversion of CO2 and HCO−3 From measurements made in the light, net uptake of both CO2 and HCO−3 can be readily determined. In addition, analysis of the dark phase immediately following light-off provides the possibility of also determining the CO2 evolution whích ís occurring during photosynthesis, and thus also the gross CO2 uptake rates in the light. Results are presented for the response of dissolved inorganic carbon (C1) flux rates to external C, in low-C1 grown cells of both Synechococcus PCC7942 and Chlamydomonas reinhardtii and these are consistent with previous studies showing that such cells possess capacities to utilize both CO2 and HCO−3 for photosynthesis. The advantages and potential errors which are inherent in this technique are discussed together with its potential for future studies on C1 transport under various experimental conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1994.tb08811.x
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  • 6
    Electronic Resource
    Electronic Resource
    Carbonic anhydrase activity and inorganic carbon fluxes in low- and high-C1 cells of Chlamydomonas reinhardtü and Scenedesmus obliquus (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 90 (1994), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Carbonic anhydrase (CA) activity associated with high- and low-dissolved inorganic carbon (C1) grown cells was examined in whole cells by measuring 18O exchange from doubly labeled CO2 (13C18O18O). Both algal species showed the presence of extracellular (periplasmic) as well as intracellular CA activity, which were both greatly increased in low-C1 cells. The periplasmic CA activity was at least 40-fold higher in lowcompared to high-C1 cells in both C. reinhardtii and S. obliquus. while low-C1 cells of S. obliquus showed the highest activity of internal CA. The CA inhibitor ethoxyzolamide showed a strong inhibition of the C1 uptake process in both C. reinhardtii and S. obliquus as in cyanobacteria. which may indicate that the nature of the primary uptake process is similar in both green algae and cyanobacteria. By using a mass spectrometnc disequilibrium technique it was possible to separate the C1 fluxes of net HCO−3-uptake and net CO2-uptake during steady-state photosynthesis in high- and Sow-C1 grown cells of Chlamydomonas reinhardtii (WT. 2137+) and Scenedesmus obliquus (WT. D3). It was found that both high- and low-C1 cells of the two algae can utilize both CO2 and HCO−3 for photosynthesis, although low-C1 cells have a higher affinity for the uptake of both C1 species. Induction at low-C1 causes an increase in the affinity of both species for HCO−3 and CO2; changes in net CO2-uptake were, however, significantly greater.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1994.tb08812.x
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  • 7
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    Landau-Zener-Stückelberg-Majorana interference in a 3D transmon driven by a chirped microwave (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-03-16
    Description: By driving a 3D transmon with microwave fields, we generate an effective avoided energy-level crossing. Then we chirp microwave frequency, which is equivalent to driving the system through the avoided energy-level crossing by sweeping the avoided crossing. A double-passage chirp produces Landau-Zener-Stückelberg-Majorana (LZSM) interference that agree well with the numerical results, especially with the initial state being an eigen-energy state in the center of an avoided level crossing. A time-resolved state tomography measurement is performed in the evolution of LZSM interference, showing an experimental evidence for the dynamical evolution of quantum state. Our method is fully applicable to other quantum systems that contain no intrinsic avoided level crossing, providing an alternative approach for quantum control and quantum simulation.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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