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Yun, Jin-Hyeon,Polyakov, Alexander Y.,Kim, Kyu-Cheol,Yu, Yeon Tae,Lee, Donghyun,Lee, In-Hwan The Optical Society 2018 Optics letters Vol.43 No.10
<P>We propose stretchable plasmonic templates of Au and Au/SiO2 nanoparticles (NPs) to improve the luminescence of CsPbBr3 perovskite nanocrystals (PNCs). These templates are highly flexible and consist of polymer-metal NP composites that facilitate the luminescence enhancement by localized surface plasmons (LSPs) due to coupling with metal NP. This template also prevents the degradation of carrier transport properties for perovskite light-emitting diodes by embedding metal NPs in polymer. The luminescence of PNC film on the template with Au NPs decreases by 21% compared to PNC films on the reference (polymer film without metal NPs), while it increases by 54% for the templates with Au/SiO2 NPs. The observed effects are explained by the luminescence enhancement due to coupling to LSPs formed by the Au/SiO2 NPs and by the prevalence of electron tunneling and dumping for Au NPs. (C) 2018 Optical Society of America</P>
Formate-driven growth coupled with H<sub>2</sub> production
Kim, Yun Jae,Lee, Hyun Sook,Kim, Eun Sook,Bae, Seung Seob,Lim, Jae Kyu,Matsumi, Rie,Lebedinsky, Alexander V.,Sokolova, Tatyana G.,Kozhevnikova, Darya A.,Cha, Sun-Shin,Kim, Sang-Jin,Kwon, Kae Kyoung,Im Nature Publishing Group, a division of Macmillan P 2010 Nature Vol.467 No.7313
Although a common reaction in anaerobic environments, the conversion of formate and water to bicarbonate and H<SUB>2</SUB> (with a change in Gibbs free energy of ?G째 = +1.3??kJ??mol<SUP>??1</SUP>) has not been considered energetic enough to support growth of microorganisms. Recently, experimental evidence for growth on formate was reported for syntrophic communities of Moorella sp. strain AMP and a hydrogen-consuming Methanothermobacter species and of Desulfovibrio sp. strain G11 and Methanobrevibacter arboriphilus strain AZ. The basis of the sustainable growth of the formate-users is explained by H<SUB>2</SUB> consumption by the methanogens, which lowers the H<SUB>2</SUB> partial pressure, thus making the pathway exergonic. However, it has not been shown that a single strain can grow on formate by catalysing its conversion to bicarbonate and H<SUB>2</SUB>. Here we report that several hyperthermophilic archaea belonging to the Thermococcus genus are capable of formate-oxidizing, H<SUB>2</SUB>-producing growth. The actual ?G values for the formate metabolism are calculated to range between ??8 and ??20??kJ??mol<SUP>??1</SUP> under the physiological conditions where Thermococcus onnurineus strain NA1 are grown. Furthermore, we detected ATP synthesis in the presence of formate as a sole energy source. Gene expression profiling and disruption identified the gene cluster encoding formate hydrogen lyase, cation/proton antiporter and formate transporter, which were responsible for the growth of T. onnurineus NA1 on formate. This work shows formate-driven growth by a single microorganism with protons as the electron acceptor, and reports the biochemical basis of this ability.
Investigation of microstrip antenna array stacked structure realized on LTCC for 60 GHz band
Bondarik, Alexander,Jun, Dong Suk,Kim, Joung Myoun,Yun, Je Hoon Wiley Subscription Services, Inc., A Wiley Company 2010 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.52 No.3
<P>This article presents the 16-element antenna array with parasitic microstrip antenna single element. Antenna designed to operate at 60 GHz and its structure based on low-temperature cofired ceramic (LTCC) substrate. Gain more than 18 dBi and return loss bandwidth about 20% were obtained after antenna geometry parameters optimization. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 648–652, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25006</P>
Natural Killer Cells Degenerate Intact Sensory Afferents following Nerve Injury
Davies, Alexander J.,Kim, Hyoung Woo,Gonzalez-Cano, Rafael,Choi, Jahyang,Back, Seung Keun,Roh, Seung Eon,Johnson, Errin,Gabriac, Melanie,Kim, Mi-Sun,Lee, Jaehee,Lee, Jeong Eun,Kim, Yun Sook,Bae, Yong Cell Press 2019 Cell Vol. No.
<P><B>Summary</B></P> <P>Sensory axons degenerate following separation from their cell body, but partial injury to peripheral nerves may leave the integrity of damaged axons preserved. We show that an endogenous ligand for the natural killer (NK) cell receptor NKG2D, Retinoic Acid Early 1 (RAE1), is re-expressed in adult dorsal root ganglion neurons following peripheral nerve injury, triggering selective degeneration of injured axons. Infiltration of cytotoxic NK cells into the sciatic nerve by extravasation occurs within 3 days following crush injury. Using a combination of genetic cell ablation and cytokine-antibody complex stimulation, we show that NK cell function correlates with loss of sensation due to degeneration of injured afferents and reduced incidence of post-injury hypersensitivity. This neuro-immune mechanism of selective NK cell-mediated degeneration of damaged but intact sensory axons complements Wallerian degeneration and suggests the therapeutic potential of modulating NK cell function to resolve painful neuropathy through the clearance of partially damaged nerves.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Cytotoxic NK cells infiltrate the damaged peripheral nerve within days of injury </LI> <LI> Injured sensory axons express NKG2D ligand RAE1 to signal degeneration by NK cells </LI> <LI> Clearance of damaged axons reduces development of chronic pain after nerve injury </LI> <LI> NK cells complement Wallerian degeneration to aid functional regeneration of PNS </LI> </UL> </P> <P><B>Graphical Abstract</B></P> <P>[DISPLAY OMISSION]</P>