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  • 陳應誠 博士
    Phys. Rev. Lett. 120, 183602 (2018).
    Quantum memory is a device that can store and then retrieve a quantum state on demand. It is an important building block in long-distance quantum communication. To outperform the direct transmission of photons with quantum repeaters, it is crucial to develop quantum memories with high fidelity, high efficiency and a long storage time. We achieved a storage efficiency of 92.0 % for a coherent optical memory based on the electromagnetically induced transparency scheme in optically dense cold atomic media. We also obtain a useful time-bandwidth product of 1200, considering only storage where the retrieval efficiency remains above 50 %. Both are the best record to date in all kinds of the schemes for the realization of optical memory. Our work significantly advances the pursuit of a high-performance optical memory and should have important applications ...
  • 許良彥 博士
    J. Phys. Chem. Lett., 9 (24), 7032–7039 (2018).
    We investigate resonance energy transfer (RET) between a donor–acceptor pair above a gold surface (including bulk and thin-film systems) and explore the distance/frequency dependence of RET enhancements using the theory we developed previously. The mechanism of RET above a gold surface can be attributed to the effects of mirror dipoles, surface plasmon polaritons (SPPs), and retardation. To clarify these effects on RET, we analyze the enhancements of RET by the mirror method, the decomposition of s- and p-polarization, and the SPP dispersion of charge-symmetric and charge-antisymmetric modes. We find a characteristic distance (approximately 1/10 of the wavelength) that can be used to classify the dominant effect on RET. Moreover, the characteristic distance can be shortened by narrowing the thickness of the thin-film systems, indicating that  ...
  • 陳貴賢 博士
    NATURE COMMUNICATIONS (DOI: 10.1038/s41467-017-02547-4, 2018)
    Carbon-doped SnS2 (SnS2-C) metal dichalcogenide nanostructure has been synthesized using a hydrothermal technique, which exhibits a highly active and selective photocatalytic conversion of CO2 to hydrocarbons under visible-light, attaining a photochemical quantum efficiency of above 0.7%. The SnS2 -C photocatalyst represents an important contribution towards high quantum efficiency artificial photosynthesis based on gas phase photocatalytic CO2 reduction under visible light.
  • 張煥正 博士
    Anal. Chem. 90, 1566–1571 (2018).
    Containing an ensemble of nitrogen-vacancy centers in crystal matrices, fluorescent nanodiamonds (FNDs) are a new type of photostable markers that have found wide applications in light microscopy.  The nanomaterial also has a dense carbon core, making it visible to electron microscopy.  Here, we show that FNDs encapsulated in biotinylated lipids (bLs) are useful for sub-diffraction imaging of antigens on cell surface with correlative light-electron microscopy (CLEM).  The lipid encapsulation enables not only good dispersion of the particles in biological buffers but also high specific labeling of live cells.  By employing the bL-encapsulated FNDs to target CD44 on HeLa cell surface through biotin-mediated immunostaining, we obtained the spatial distribution of these antigens by CLEM with a localization accuracy of ~50 nm in rout ...
  • 謝佳龍 博士
    ACS Photonics 4(7), 1730 (2017).
    Localization of single nano-sized light emitter has substantial applications in bioimaging. The accuracy and precision of localization are limited by the noise and the heterogeneous background superimposed on the signal. While the effects of noise are well recognized, influence of background is less addressed. Proper background correction not only provides more accurate localization data but also enhances the sensitivity of detection. Here, we demonstrate a new approach to background correction by estimating and removing the heterogeneous but stationary background from a series of images containing a spatially moving signal. Our approach exploits the correlated signal information encoded in the neighboring pixels governed by the point-spread function of the measurement system. This new approach makes it possible to obtain the background even when t ...
  • 余慈顏 博士
    Scientific Reports, 8, 13501 (2018).
    Incorporating membrane proteins into membrane mimicking systems is an essential process for biophysical studies and structure determination. Monodisperse lipid nanodiscs have been found to be a suitable tool, as they provide a near-native lipid bilayer environment. Recently, a covalently circularized nanodisc (cND) assembled with a membrane scaffold protein (MSP) in circular form, instead of conventional linear form, has emerged. Covalently circularized nanodiscs have been shown to have improved stability, however the optimal strategies for the incorporation of membrane proteins, as well as the physicochemical properties of the membrane protein embedded in the cND, have not been studied. Bacteriorhodopsin (bR) is a seven-transmembrane helix (7TM) membrane protein, and it forms a two dimensional crystal consisting of trimeric bR on the purple membra ...
  • 劉國平 博士
    Nature Chemistry, 9, 1175-1180 (2017).
    The transition state, which gates and modulates the reactive flux, serves as the central concept in our understanding of activated reactions. The barrier height of the transition state can be estimated from the activation energy taken from thermal kinetics data or from the energetic threshold in the measured excitation function (the dependence of reaction cross sections on initial collision energies). However, another critical and equally important property, the angle-dependent barrier to reaction, has not yet been amenable to experimental determination until now. Here, using the benchmark reaction of Cl + CHD3(v1 = 1) as an example, we show how to map this anisotropic property of the transition state as a function of collision energy from the preferred reactant bond alignment of the backward-scattered products ‒ the imprints of small  ...
  • 高橋開人 博士
    Physical Chemistry Chemical Physics, 20, 20217-20227 (2018).
    Criegee intermediates (CIs), formed in the reactions of unsaturated hydrocarbons with ozone, are very reactive carbonyl oxides and have recently been suggested as important oxidants in the atmosphere. In this work, we studied the substituent effect on the water monomer and dimer reaction with CIs which include up to three carbon atoms at the QCISD(T)/CBS//B3LYP/6-311+G(2d,2p) level. Our calculation showed that for saturated CIs with a hydrogen atom on the same side as the terminal oxygen atom, the reaction with water vapor would likely dominate the removal processes of these CIs in the atmosphere. On the other hand, for unsaturated CIs, the reactivity toward water vapor decreases compared to the saturated species allowing them to survive in humid atmospheric environments. We also evaluated the kinetic isotope effect in the reaction between CI and w ...
  • 楊大衍 博士
    Scientific Reports 7, 39792 (2017).
    Proteins are of interest in nano-bio electronic devices due to their versatile structures, exquisite functionality and specificity. However, quantum transport measurements produce conflicting results due to technical limitations whereby it is difficult to precisely determine molecular orientation, the nature of the moieties, the presence of the surroundings and the temperature; in such circumstances a better understanding of the protein electron transfer (ET) pathway and the mechanism remains a considerable challenge. Here, we report an approach to mechanically drive polypeptide flip-flop motion to achieve a logic gate with ON and OFF states during protein ET. We have calculated the transmission spectra of the peptide-based molecular junctions and observed the hallmarks of electrical current and conductance. The results indicate that peptide ET fol ...
  • 廖仲麒 博士
    Nature Communications, 9, 2023 (2018).
    Distal appendages (DAPs) are nanoscale, pinwheel-like structures protruding from the distal end of the centriole that mediate membrane docking during ciliogenesis, marking the cilia base around the ciliary gate. Here we determine a super-resolved multiplex of 16 centriole-distal-end components. Surprisingly, rather than pinwheels, intact DAPs exhibit a cone-shaped architecture with components filling the space between each pinwheel blade, a new structural element we term the distal appendage matrix (DAM). Specifically, CEP83, CEP89, SCLT1, and CEP164 form the backbone of pinwheel blades, with CEP83 confined at the root and CEP164 extending to the tip near the membrane-docking site. By contrast, FBF1 marks the distal end of the DAM near the ciliary membrane. Strikingly, unlike CEP164, which is essential for ciliogenesis, FBF1 is required for ciliary ...
  • 曾文碧 博士
    Chem. Eur. J., 23, 13669-13675 (2017).
    High-resolution mass-analyzed threshold ionization (MATI) spectra of (h6-Ph2)2Cr and (h6-Ph2)(h6-PhMe)Cr demonstrate that the Ph groups work as electron donors, decreasing the ionization energy of the gas-phase bisarene complexes. In contrast to electrochemical data, a close similarity of the Ph and Me group effects on the oxidation of free sandwich molecules has been revealed. However, DFT calculations testify for the opposite shifts of the electron density caused by the Me and Ph substituents in the neutral complexes, the latter behaving as an electron-accepting fragment. On the contrary, in the bisarene cations, the Ph group becomes a stronger donor than methyl. This change provides the similar substituent effects observed with the MATI experiment. On the other hand, the well-documented opposite influence of the Me and Ph fragments on the redox  ...

最新消息

演講資訊

Jan
24
2019
Super-resolution: better, deeper, and richer information
Prof. Peng Xi, Department of Biomedical Engineering, Peking University, China
2019-01-24 上午 10:00  浦大邦紀念講堂
Jan
24
2019
Multiscale functional and structural brain imaging
Prof. Meng Cui, Department of Electrical and Computer Engineering and Biology, Purdue University, USA
2019-01-24 上午 11:00  浦大邦紀念講堂

活動資訊

Symposium on Chemical Reaction Dynamics (Honoring the marvelous career of Dr. Kopin Liu)
浦大邦紀念講堂
2019-01-28 上午 09:00 ~ 下午 12:00
This is a symposium hosted by the Institute of Atomic and Molecular Sciences to discuss the latest development in Chemical Dynamics and Spectroscopy, and honoring the marvelous career of Dr. Kopin Liu.
13th New Diamond and Nano Carbons Conference
花蓮遠雄悅來大飯店
2019-05-12 上午 09:00 ~ 2019-05-17 下午 06:00
NDNC has a long history and is a merger of the former International Conference on New Diamond Science and Technology (ICNDST, initiated in 1988 in Japan) and the International Conference on Applications of Diamonds (Applied Diamond Conference), initiated in 1991 in USA). In recent years, NDNC 2018 was held in USA, NDNC 2017 was held in Australia, and NDNC 2016 was held in China. The conference will present recent breakthroughs in the synthesis, physics, and application of diamonds and other carbon nanostructures, such as graphene and nanotubes. The program features four plenary talks, 25 invited talks, oral contributions and poster sessions. The conference venue is the 4-star Farglory Resort in Hualien at the entrance of the majestic Taroko Gorge National Park.
 
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最後更新於 2019-01-16 14:04:31
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