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Biochemical Properties and Localization of the b-Expansin OsEXPB3 in Rice (Oryza sativa L.)
Dongsu Choi,Yi Lee 한국분자세포생물학회 2005 Molecules and cells Vol.20 No.1
α-Expansins are bound to the cell wall of plants and can be solubilized with an extraction buffer containing 1 M NaCl. Localization of α-expansins in the cell wall was confirmed by immunogold labeling and electron microscopy. The subcellular localization of vegetative β-expansins has not yet been studied. Using antibodies specific for OsEXPB3, a vegetative β-expansin of rice (Oryza sativa L.), we found that OsEXPB3 is tightly bound to the cell wall and, unlike α-expansins, cannot be solubilized with extraction buffer containing 1 M NaCl. OsEXPB3 protein could only be extracted with buffer containing SDS. The subcellular localization of the OsEXPB3 protein was confirmed by immunogold labeling and electron microscopy. Gold particles were mainly distributed over the primary cell walls. Immunohistochemistry showed that OsEXPB3 is present in all regions of the coleoptile and root tissues tested.
Dongsu Choi,Soong-Taek Hwang,Yeon-Ki Kim,Seong-Han Sohn 한국식물학회 2018 Journal of Plant Biology Vol.61 No.6
Submergence harms plants by limiting gasexchange and decreasing incoming light. Upon prolongedflooding, deepwater rice (Oryza sativa) escapes completesubmergence by rapid stem growth, but the mechanism ofstem elongation in the early stages following submergenceremains unclear. To elucidate changes in gene expressionduring early submergence-induced stem elongation, weperformed transcriptome analysis using microarray system indeepwater rice. We compared gene expression between thecontrol (0 h) and 1, 4 hour after submergence. We found 586and 1,353 genes for Sub 1 h and 4 h treatments each thatwere up-regulated by at least two-fold, compared to thecontrol (P < 0.05), submergence up-regulated gene expressionrelated to at least 10 independent biological processes. Expression of deepwater rice genes related to energy productionthrough fermentation increased with time after submergence,which likely ensures sufficient energy for rapid stemelongation. We provide the first report of initial and overallexpression of deepwater rice genes related to the responsespecific to submergence escape.
Choi, Dongsu,Toda, Hiroto,Kim, Yongsuk Springer Japan 2014 Ecological research Vol.29 No.1
<P><B>Abstract</B></P><P>We used a physiological approach to investigate the effect of sulfur dioxide (SO<SUB>2</SUB>) on <I>Alnus sieboldiana</I> Matsum. (<I>A. sieboldiana</I>) and symbiotic <I>Frankia</I> spp. in Miyakejima Island, which was devastated by volcanic action in July of 2000. In April of 2008, three study sites were chosen in the forest of Miyakejima Island, and were categorized as high, medium, or low in relation to their sulfur dioxide concentration (volcanic gas). Nine <I>A. sieboldiana</I> trees were selected from naturally regenerated forest at each site. The higher the SO<SUB>2</SUB> concentration at the study site, the lower was the photosynthetic rate and the maximum photochemical efficiency of PSII (<I>F</I><SUB>v</SUB>/<I>F</I><SUB>m</SUB>) of <I>A. sieboldiana</I> and its apparent quantum yield. The acetylene reduction rate of the <I>Frankia</I> spp. symbiotic with <I>A. sieboldiana</I> was significantly less at the high SO<SUB>2</SUB> concentration (<I>p</I><0.05). The nitrogen concentration in their leaves remained high, however. There was no significant difference in the chlorophyll concentration (Chl <I>a</I> + <I>b</I>) in leaves from the three sites. The photosynthetic nitrogen use efficiency decreased significantly in sites with a high SO<SUB>2</SUB> concentration, however. As a result, <I>A. sieboldiana</I> regenerated at the sites with high or medium SO<SUB>2</SUB> concentration underwent approximately 50–70 % less growth than at the site with a low SO<SUB>2</SUB> concentration.</P>
Park, Dongsu,Park, Inyoung,Lee, Deogwon,Choi, Young Bong,Lee, Hyunsook,Yun, Yungdae American Society of Hematology 2007 Blood Vol.109 No.12
<B>Abstract</B><P>Lck-interacting adaptor protein/Rlk/Itk-binding protein (Lad/RIBP) was previously identified as an adaptor protein involved in TCR-mediated T-cell activation. To elucidate the functions of Lad further, we here performed yeast 2-hybrid screening using Lad as bait and discovered that the G protein β subunit (Gβ) is a Lad-binding partner. Since the most well-known G protein-coupled receptor in T cells is the chemokine receptor, we investigated whether Lad is involved in chemokine signaling. We found that, upon chemokine treatment, Lad associated with Gβ in Jurkat T cells. Furthermore, ectopic expression of dominant-negative Lad or the reduction of endogenous Lad expression by siRNA impaired the chemokine-induced migration of T cells, indicating that Lad is required for chemokine-induced T-cell migration. Subsequent investigation of the signaling pathways revealed that, in response to chemokine, Lad associated with the tyrosine kinases Lck and Zap-70 and that Lad was essential for the activation of Zap-70. Moreover, Lad was required for the chemokine-dependent tyrosine phosphorylation of focal adhesion molecules that included Pyk2 and paxillin. Taken together, these data show that, upon chemokine stimulation, Lad acts as an adaptor protein that links the G protein β subunit to the tyrosine kinases Lck and Zap-70, thereby mediating T-cell migration.</P>
EV 정전류 모드 충전을 위한 용량성 근접 무선 전력 전송 시스템의 오정렬을 고려한 보상 회로 최적 설계
이동수(Dongsu Lee),최성혁(Sunghyuk Choi),하정익(Jung-Ik Ha) 전력전자학회 2021 전력전자학술대회 논문집 Vol.2021 No.11
용량성 무선 전력 전송(Capacitive power transfer, CPT)은 두 쌍의 금속판 사이의 전기장을 이용하여 전력을 전송한다. CPT 시스템이 전송할 수 있는 전력 용량은 두 금속판 사이에 인가되는 전압의 크기에 비례하기 때문에 높은 전압을 인가하기 위하여 대칭형 /// 등의 보상 회로를 연결하여 사용한다. 보상 회로는 주로 부하 독립적인 출력 특성을 갖도록 설계된다. 그러나 이 경우 금속판 오정렬에 따라 출력 특성을 유지하지 못하고 출력 특성이 설계값으로부터 벗어나는 문제점을 갖는다. 본 논문에서는 부하 변동과 송·수신부 오정렬 상황에 모두 강인한 CPT 보상 회로 설계 방법을 제시한다.
A New Power Management IC Architecture for Envelope Tracking Power Amplifier
Jinsung Choi,Dongsu Kim,Daehyun Kang,Bumman Kim IEEE 2011 IEEE transactions on microwave theory and techniqu Vol.59 No.7
<P>A new supply modulator architecture for robust performance against the battery voltage variation is presented. The resulting modulator is an optimized power management integrated circuit (PMIC) for an envelope tracking (ET) power amplifier (PA). The basic topology of the PMIC is based on a hybrid switching amplifier combining a wideband class-AB buffered linear amplifier and a highly efficient switching-mode buck converter in a master-slave configuration. The additional boost converter regulates the supply voltage of the linear amplifier, while the supply of the buck converter is directly coupled to the battery. The proposed supply modulator achieves max/min efficiencies of 76.8/69.3% over the entire battery voltage range. The ET PA is operated at 4.5 V, providing higher output power, efficiency, and gain than at nominal 3.5-V design. The robust performance of the proposed PMIC is demonstrated.</P>