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Le Cuong Nhat,Kim Hyun Woo,Baek In Hyung,Bark Hyeon Sang,Shin Junho,Jang Kyu-Ha,Cho Sunglae,Jeong Young Uk,Oang Key Young,Lee Kitae 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.5
In this paper, we report the structural dynamics of polycrystalline bismuth (Bi) thin flms in response to photoexcitation, visualized by mega-electron-volt ultrafast electron difraction. The data reveal that the carrier–phonon scattering process involves phonon squeezing within sub-picoseconds (ps) and lattice thermalization within a few ps. Through the time-resolved pair distribution function analysis, we directly observe the changes in the interatomic distance of adjacent Bi atoms in real space, which can be explained by phonon softening and subsequent phonon squeezing.
Nguyen, Cuong Thach,Le, Nhat-Tu,Tran, Thao Dang-Hien,Kim, Eun-Hye,Park, Sang-Sang,Luong, Truc Thanh,Chung, Kyung-Tae,Pyo, Suhkneung,Rhee, Dong-Kwon American Society for Microbiology 2014 Infection and immunity Vol.82 No.9
<P>Caseinolytic protease L (ClpL) is a member of the HSP100/Clp chaperone family, which is found mainly in Gram-positive bacteria. ClpL is highly expressed during infection for refolding of stress-induced denatured proteins, some of which are important for adherence. However, the role of ClpL in modulating pneumococcal virulence is poorly understood. Here, we show that ClpL impairs pneumococcal adherence to A549 lung cells by inducing and activating Rap1 and Rac1, thus increasing phosphorylation of cofilin (inactive form). Moreover, infection with a <I>clpL</I> mutant (Δ<I>clpL</I>) causes a greater degree of filopodium formation than D39 wild-type (WT) infection. Inhibition of Rap1 and Rac1 impairs filopodium formation and pneumococcal adherence. Therefore, ClpL can reduce pneumococcal adherence to A549 cells, likely via modulation of Rap1- and Rac1-mediated filopodium formation. These results demonstrate a potential role for ClpL in pneumococcal resistance to host cell adherence during infection. This study provides insight into further understanding the interactions between hosts and pathogens.</P>
Kim Ha-Na,Lee Kitae,Kumar Manoj,Ryu Woo-Je,Le Cuong Nhat,Jeong Young Uk,Kim Kyung Nam,Park Seong Hee,Jeon Min Yong,Choi Il Woo,Lee Seong Geun,Kang Seung Woo,Lee Sang Hwa,Jeon Cheonha,Jang Yong Ha,Lee 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.81 No.5
Carbon ions and protons from a double-layer target, a copper foil coated with a polymer exhibit non-Maxwellian spectral shapes, when an ultra-intense laser pulse with a high temporal contrast ratio was focused on the metal side of the target. The spectral shapes, showing strong reduction of low-energy ions, a high-energy island, and a modulated structure, are diferent from a typical thermal distribution usually obtained from a pure metal target in the laser acceleration of ions. In the case of C6+ ion, a high-energy island with an energy spread of 0.5 MeV/u was observed, which is separated from the low-energy spectrum by 0.2 MeV/u. A modulation in the proton energy spectrum was observed, which leads to a secondary peak at 2.2 MeV/u in addition to a peak at a low energy of 1.5 MeV/u. The maximum energy obtained from the double-layer target at a laser intensity of 3 × 1020 W/cm2 is 3.4 MeV/u for C6+ ions and 10 MeV/u for protons, which are higher than those obtained from a single metal foil by factors of 1.7 and 1.3, respectively. Such a spectral shape and energy enhancement could be accounted for by a bulk electrostatic feld formed at the metal-polymer interface and multi-species interactions. These results show that the spectral shape of the ion beam can be tailored with an adequate structure of micrometer-thick target.