http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Floquet States in a Single Quantum Dot Driven by THz Fields
Koo-Chul Je,박승한,주홍렬,Taek Yong Hwang 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
We present quasi-energies and Floquet states of excitons driven by terahertz (THz) electric .elds in a single quantum dot using the Floquet theory. The eigenvalues are signi.cantly coupled to truncated states, which correspond to the number of photons in the THz .eld. In particular, we .nd that for N = 20 photons the energy dierence between quasi-energy ladders remains almost constant up to strengths of the THz .elds with f < 16 in a single quantum dot. The photon representation is needed with the larger number to accurately describe the single quantum dot system as the intensity of the THz .eld is increased.
Ultrafast Carrier Dynamics in THz-Field-Biased Semiconductor Superlattices
Koo-Chul Je,박승한 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.II
Ultrafast carrier dynamics in semiconductor superlattices are numerically investigated in the presence of a THz field. In particular, when the Bloch type period is shorter, over 1.5 times, than the THz frequency, the carriers have a combined periodic motion with two frequencies, which are a Bloch type frequency due to the strength of the THz field and the applied THz frequency. In other cases, the carriers have a periodic motion with the applied THz frequency. In addition, we observe that the LO-phonon replicas in the energy relaxation of the carriers disappear and that some of the carriers are more slowly relaxed by the broadened distributions due to the THz field.
Continuous Wave Optical Properties in dc-Biased Nanostructure Semiconductors Driven by a THz-Field
Koo-Chul Je,Hwa-Min Kim,Jeung Sun Ahn,T. Mitani 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
The optical response of biased nanostructure semiconductors with a THz field are studied by calculating absorption spectra based on semiconductor Bloch equations. We investigate dependence of absorption spectra on the relative phase between optical pulses and THz field and continuous wave optical properties using short pulse technique. All of the absorption spectra have Stark ladder structures with energy spacing, $m\hbar \omega_B+m'\hbar \omega_L$. There are actually frequency range where there is gain for various phases. But, there is no gain region in the continuous wave absorption spectrum. The optical gain without population inversion results from the nonlinear sum and difference mixing of the optical and the THz frequencies via the phases.
구본영,김제선,이재철 최신의학사 1974 最新醫學 Vol.17 No.6
In order to investigate the effect of prednisolone on leukocytosis of rats we observed changes of total number of -peripheral neutrophilis and lymphocytes from normal rats and prednisolone injected rats. The observation was -made on 1, 2, 3, 4, 5, 6. 7, 8, 9, 10, 12, 16, 20 and 24 hours after intramuscular injection of prednisolone, respectively. The results were as follows: Marked neutrophilic leukocytosis and lymphopenia were observed in the prednisolone-injected rats.
Pn-AMP1, a Plant Defense Protein, Induces Actin Depolarization in Yeasts
Koo, Ja Choon,Lee, Boyoung,Young, Michael E.,Koo, Sung Chul,Cooper, John A.,Baek, Dongwon,Lim, Chae Oh,Lee, Sang Yeol,Yun, Dae-Jin,Cho, Moo Je Oxford University Press 2004 Plant & cell physiology Vol.45 No.11
<P>Pn-AMP1, <I>Pharbitis nil</I> antimicrobial peptide 1, is a small cysteine-rich peptide implicated in host-plant defense. We show here that Pn-AMP1 causes depolarization of the actin cytoskeleton in <I>Saccharomyces cerevisiae</I> and <I>Candida albicans</I>. Pn-AMP1 induces rapid depolarization of actin cables and patches within 15 min. Increased osmolarity or temperature induces transient actin depolarization and results in increased sensitivity to Pn-AMP1, while cells conditioned to these stresses show less sensitivity. Mutations in components of a cell wall integrity pathway (Wsc1p, Rom2p, Bck1p and Mpk1p), which regulate actin repolarization, result in increased sensitivity to Pn-AMP1. A genetic screen reveals that mutations in components of the α-1,6-mannosyltransferase complex (Mnn10p, Mnn11p and Och1p), which regulate mannosylation of cell wall proteins, confer resistance to Pn-AMP1. FITC-conjugated Pn-AMP1 localizes to the outer surface of the cell with no significant staining observed in spheroplasts. Taken together, these results indicate that cell wall proteins are determinants of resistance to Pn-AMP1, and the ability of a plant defense protein to induce actin depolarization is important for its antifungal activity.</P>
Pn-AMP1, a Plant Defense Protein, Induces Actin Depolarization in Yeasts
Koo, Ja-Choon,Lee, Boyoung,Michael E. Young,Koo, Sung-Chul,John A. Cooper,Baek, Dong-won,Lim, Chae-Oh,Lee, Sang-Yeol,Yun, Dae-Jin,Cho, Moo-Je Plant molecular biology and biotechnology research 2004 Plant molecular biology and biotechnology research Vol.2004 No.-
Pn-AMP1, Pharbitis nil antimicrobial peptide 1, is a small cysteine-rich peptide implicated in host-plant defense. We show here that Pn-AMP1 causes depolarization of the actin cytoskeleton in Saccharomyces cerevisiae and Candida albicans. Pn-AMP1 induces rapid depolarization of actin cables and patches within 15 min. Increased osmolarity or temperature induces transient actin depolarization and results in increased sensitivity to Pn-AMP1, while cells conditioned to these stresses show less sensitivity. Mutations in components of a cell wall integrity pathway (Wsc1p, Rom2p, Bck1p and Mpk1p), which regulate actin repolarization, result in increased sensitivity to Pn-AMP1. A genetic screen reveals that mutations in components of the α-1,6-mannosyltransferase complex (Mnn10p, Mnn11p and Och1p), which regulate mannosylation of cell wall proteins, confer resistance to Pn-AMP1. FITC-conjugated Pn-AMP1 localizes to the outer surface of the cell with no significant staining observed in spheroplasts. Taken together, these results indicate that cell wall proteins are determinants of resistance to Pn-AMP1, and the ability of a plant defense protein to induce actin depolarization is important for its antifungal activity.
Identification and characterization of alternative promoters of the rice MAP kinase gene OsBWMK1
Koo, Sung Cheol,Choi, Man Soo,Chun, Hyun Jin,Park, Hyeong Cheol,Kang, Chang Ho,Shim, Sang In,Chung, Jong Il,Cheong, Yong Hwa,Lee, Sang Yeol,Yun, Dae-Jin,Chung, Woo Sik,Cho, Moo Je,Kim, Min Chul Springer-Verlag 2009 Molecules and cells Vol.27 No.4
<P>Our previous study suggested that OsBWMK1, a gene which encodes a member of the rice MAP kinase family, generates transcript variants which show distinct expression patterns in response to environmental stresses. The transcript variants are generated by alternative splicing and by use of alternative promoters. To test whether the two alternative promoters, pOsBWMK1L (promoter for the OsBWMK1L splice variant) and pOsBWMK1S (promoter for the OsBWMK1S splice variant), are biologically functional, we analyzed transgenic plants expressing GUS fusion constructs for each promoter. Both pOsBWMK1L and pOsBWMK1S are biologically active, although the activity of pOsBWMK1S is lower than that of pOsBWMK1L. Histochemical analysis revealed that pOsBWMK1L is constitutively active in most tissues at various developmental stages in rice and Arabidopsis, whereas pOsBWMK1S activity is spatially and temporally restricted. Furthermore, the expression of pOsBWMK1S::GUS was upregulated in response to hydrogen peroxide, a plant defense signaling molecule, in both plant species. These results suggest that the differential expression of OsBWMK1 splice variants is the result of alternative promoter usage and, moreover, that the mechanisms controlling OsBWMK1 gene expression are conserved in both monocot and dicot plants.</P>
The calmodulin-binding transcription factor OsCBT suppresses defense responses to pathogens in rice
Koo, Sung Cheol,Choi, Man Soo,Chun, Hyun Jin,Shin, Dong Bum,Park, Bong Soo,Kim, Yul Ho,Park, Hyang-Mi,Seo, Hak Soo,Song, Jong Tae,Kang, Kyu Young,Yun, Dae-Jin,Chung, Woo Sik,Cho, Moo Je,Kim, Min Chul Springer-Verlag 2009 Molecules and cells Vol.27 No.5
<P>We previously isolated the OsCBT gene, which encodes a calmodulin (CaM)-binding protein, from a rice expression library constructed from fungal elicitor-treated rice suspension cells. In order to understand the function of OsCBT in rice, we isolated and characterized a T-DNA insertion mutant allele named oscbt-1. The oscbt-1 mutant exhibits reduced levels of OsCBT transcripts and no significant morphological changes compared to wild-type plant although the growth of the mutant is stunted. However, oscbt-1 mutants showed significant resistance to two major rice pathogens. The growth of the rice blast fungus Magnaporthe grisea, as well as the bacterial pathogen Xanthomonas oryzae pv. oryzae was significantly suppressed in oscbt-1 plants. Histochemical analysis indicated that the hypersensitive-response was induced in the oscbt-1 mutant in response to compatible strains of fungal pathogens. OsCBT expression was induced upon challenge with fungal elicitor. We also observed significant increase in the level of pathogenesis-related genes in the oscbt-1 mutant even under pathogen-free condition. Taken together, the results support an idea that OsCBT might act as a negative regulator on plant defense.</P>
FDM 3D Printing of Environmental Friendly and High Strength Bio-based PC Filaments for Baby Toys
( Seong Je Park ),( Ji Eun Lee ),( Jean Ho Park ),( Min-young Lyu ),( Keun Park ),( Myung Sool Koo ),( Sun Chul Jin ),( Ki Yong Kim ),( Yong Son ) 한국고무학회 2017 엘라스토머 및 콤포지트 Vol.52 No.2
Due to the depletion of fossil oil and the increasing oil price, bio-plastic is currently topical. Bio-based plastics are synthesized from plant resources, unlike conventional petroleum-based counterparts. Therefore, the former minimizes global warming and reduces carbon dioxide emission. Fossil polycarbonate (PC)has good mechanical and optical properties, but its synthesis requires bisphenol-A and phosgene gas, which are toxic to humans. To address these problems, the fused deposition 3D printing process (hereafter, FDM) is studied using environmentally-friendly and high-strength bio-based PC. A comparisonof the environmental impact and tensile strength of fossil PC versus bio-based PC is presented herein, demonstrating that bio-based PC is more environmentally-friendly with higher tensile strength than fossil PC. The advantages of bio-based PC are applied in the FDM process for the fabrication of environmentally-friendly baby toys.
Kim, Chul-Min,Je, Byoung-Il,Koo, Ja-Choon,Piao, Hai-Long,Park, Soon-Ju,Jeon, Joo-Mi,Kim, Min-Kyoung,Park, Sung-Han,Park, Jin-Young,Lee, Eun-Jin,Chung, Woo-Sik,Lee, Kon-Ho,Kang, Kyu-Young,Lee, Sung-Ho Plant molecular biology and biotechnology research 2004 Plant molecular biology and biotechnology research Vol.2004 No.-
A maize transposable family, Ac/Ds, has been successfully utilized as a mutagenizing agent not only in monocot but also in dicot. In order to develop insertional mutagenesis system in pepper, the mobility of Ac/Ds has been examined. In this study, the excision of the elements was monitored via transient assay system with protoplasts. Two different systems were developed and compared; one- and two-elements systems. in a one-element system, Ac alone was introduced into cells. As a two-element system, Ac and Ds were cloned into a single vector and were expressed in protoplasts. Our data showed that both Ac and Ds elements were highly mobile in pepper cells. This is the first report suggesting that Ac/Ds mediated gene tagging system could be successfully operated in pepper.