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염분 스트레스에 노출된 옥수수(Zea mays) 뿌리의 굴중성 반응
한두열(Duyeol Han),이영나(Young Na Lee),김여재(Yeo Jae Kim),박웅준(Woong June Park) 한국생명과학회 2008 생명과학회지 Vol.18 No.8
염분 스트레스에 노출된 옥수수(Zea mays) 유식물의 원뿌리는 길이생장이 억제되는데, 본 연구에서는 위와 같은 조건에서 뿌리의 굴중성 반응을 조사하였다. 고농도의 NaCl과 KCl에 의해 스트레스를 받은 옥수수 원뿌리는 수평 상태에서 중력 자극을 받기 시작한 지 2시간 이후부터 대조구에 비하여 현저한 굴중성 반응을 나타내었다. 이러한 굴중성 촉진 현상은 Na?가 아니라 K?에 의한 것이었으며, Cl?도 굴중성반응 촉진에 기여하였다. 이로부터 이들 K?와 Cl? 이온들이 세포 팽창에 필요한 삼투 조절자로 기능한다는 결론을 얻었다. 또한 염분 스트레스에 의하여 뿌리의 길이 생장이 억제되더라도 중력장 내에서의 위치 결정은 억제되지 않고 오히려 촉진된다는 점도 확인하였다. We investigated gravitropic responses in the primary root of maize (Zea mays) seedlings which were exposed to salt stress. The maize roots salt-stressed with higher than 100 mM NaCl or KCl started to reveal enhanced gravitropic curvature after 2 hours form the gravi-stimulation. Such a promotion was not caused by sodium phosphate, but invoked by potassium phosphate, indicating the active component is K?. Because NaCl increased gravitropic curvature, despite that Na? did not played any role, we evaluated the role for Cl? by comparing the effects of MgCl₂ and MgSO₄. The enhancement of the curvature only with MgCl₂ revealed that Cl? played a role in the gravi-response, indicating the involvement of anion channels. These results suggest that both of K? and Cl? play roles in the regulation of osmosis that is required for cell expansion in gravitropism as well as in nyctinasty and stomatal opening.
Ca<SUP>2</SUP>-activated K<SUP></SUP> Currents of Pancreatic Duct Cells in Guinea-pig
Han-Wook Lee,Jingchao Li,Na-Youn Koo,Zheng Gen Piao,Sung Min Hwang,Jae-Woong Han,Han-Saem Choi,Jong-Heun Lee,Joong Soo Kim,Kyungpyo Park 대한생리학회-대한약리학회 2004 The Korean Journal of Physiology & Pharmacology Vol.8 No.6
There are numerous studies on transepithelial transports in duct cells including Cl<SUP></SUP> and/or HCO<SUB>3</SUB><SUP></SUP>. However, studies on transepithelial K<SUP></SUP> transport of normal duct cells in exocrine glands are scarce. In the present study, we examined the characteristics of K<SUP></SUP> currents in single duct cells isolated from guinea pig pancreas, using a whole-cell patch clamp technique. Both Cl<SUP></SUP> and K<SUP></SUP> conductance were found with KCl rich pipette solutions. When the bath solution was changed to low Cl<SUP></SUP>, reversal potentials shifted to the negative side, 75⁑4 mV, suggesting that this current is dominantly selective to K<SUP></SUP>. We then characterized this outward rectifying K<SUP></SUP> current and examined its Ca<SUP>2</SUP> dependency. The K<SUP></SUP> currents were activated by intracellular Ca<SUP>2</SUP>. 100 nM or 500 nM Ca<SUP>2</SUP> in pipette significantly (P<0.05) increased outward currents (currents were normalized, 76.8⁑7.9 pA, n=4 or 107.9⁑35.5 pA, n=6) at 100 mV membrane potential, compared to those with 0 nM Ca<SUP>2</SUP> in pipette (27.8⁑3.7 pA, n=6). We next examined whether this K<SUP></SUP> current, recorded with 100 nM Ca<SUP>2</SUP> in pipette, was inhibited by various inhibitors, including Ba<SUP>2</SUP>, TEA and iberiotoxin. The currents were inhibited by 40.4⁑% (n=3), 87.0⁑% (n=5) and 82.5⁑% (n=9) by 1 mM Ba<SUP>2</SUP>, 5 mM TEA and 100 nM iberiotoxin, respectively. Particularly, an almost complete inhibition of the current by 100 nM iberiotoxin further confirmed that this current was activated by intracellular Ca<SUP>2</SUP>. The K<SUP></SUP> current may play a role in secretory process, since recycling of K<SUP></SUP> is critical for the initiation and sustaining of Cl<SUP></SUP> or HCO<SUB>3</SUB><SUP></SUP> secretion in these cells.
[$Ca^{2+}-activated\;K^+$ Currents of Pancreatic Duct Cells in Guinea-pig
Lee, Han-Wook,Li, Jing Chao,Koo, Na-Youn,Piao, Zheng Gen,Hwang, Sung-Min,Han, Jae-Woong,Choi, Han-Saem,Lee, Jong-Heun,Kim, Joong-Soo,Park, Kyung-Pyo The Korean Society of Pharmacology 2004 The Korean Journal of Physiology & Pharmacology Vol.8 No.6
There are numerous studies on transepithelial transports in duct cells including $Cl^-$ and/or $HCO_3^-$. However, studies on transepithelial $K^+$ transport of normal duct cells in exocrine glands are scarce. In the present study, we examined the characteristics of $K^+$ currents in single duct cells isolated from guinea pig pancreas, using a whole-cell patch clamp technique. Both $Cl^-$ and $K^+$ conductance were found with KCI rich pipette solutions. When the bath solution was changed to low $Cl^-$, reversal potentials shifted to the negative side, $-75{\pm}4\;mV$, suggesting that this current is dominantly selective to $K^+$. We then characterized this outward rectifying $K^+$ current and examined its $Ca^{2+}$ dependency. The $K^+$ currents were activated by intracellular $Ca^{2+}$. 100 nM or 500 nM $Ca^{2+}$ in pipette significantly (P<0.05) increased outward currents (currents were normalized, $76.8{\pm}7.9\;pA$, n=4 or $107.9{\pm}35.5\;pA$, n=6) at +100 mV membrane potential, compared to those with 0 nM $Ca^{2+}$ in pipette $(27.8{\pm}3.7\;pA,\;n=6)$. We next examined whether this $K^+$ current, recorded with 100 nM $Ca^{2+}$ in pipette, was inhibited by various inhibitors, including $Ba^{2+}$, TEA and iberiotoxin. The currents were inhibited by $40.4{\pm}%$ (n=3), $87.0{\pm}%$ (n=5) and $82.5{\pm}%$ (n=9) by 1 mM $Ba^{2+}$, 5 mM TEA and 100 nM iberiotoxin, respectively. Particularly, an almost complete inhibition of the current by 100 nM iberiotoxin further confirmed that this current was activated by intracellular $Ca^{2+}$. The $K^+$ current may play a role in secretory process, slnce recycling of $K^+$ is critical for the initiation and sustaining of $CI^-$ or $HCO_3^-$ secretion in these cells.
Hea-Young Lee,Ji-Woong Han,Na-Young Ro,Jin-Kyung Kwon,Byoung-Cheorl Kang 한국육종학회 2014 한국육종학회 심포지엄 Vol.2014 No.07
Capsicum diversity is getting lower in modern crops because of the genetic erosion. In Capsicum, breeders have been mainly focused on agriculturally important traits such as disease resistances, high yield and pungency. This narrow breeding pool hampered to develop improved cultivars. It has become a hot issue to conservation of genetic diversity and exploitation of wild germplasm in Capsicum. However, although a large number of accessions are maintained in Capsicum germplasm collections, their use for crop improvement is limited by the scarcity of information on genetic diversity, population structure and proper phenotypic assessment. The identification of representative and manageable subset of accessions would facilitate access to the diversity available in large collections. A genome wide germplasm characterization using molecular markers can offer reliable tools for adjusting the quality and representativeness of core samples. We investigated patterns of molecular diversity at 48 single nucleotide polymorphisms (SNPs) in 4056 accessions from 11 Capsicum species from 89 different countries. Using these genetic variations and 32 different morphological traits, 250 core set was selected in whole Capsicum germplasm. The core collection could be a primary source for distributing germplasm to pepper breeders and other national programs as well as for evaluation
탄소 섬유보강판으로 보강된 철근 콘크리트 구조물의 균열 발생원 탐사를 위한 Acoustic Emission 의 적용
한상훈,이웅종,박중열,나승일 충북대학교 건설기술연구소 2001 建設技術論文集 Vol.20 No.1
A lot of nondestructive techniques have been used to detect microcracks and internal fracture in the deteriorated concrete structures. Among those, Acoustic emission(AE) is one of the widely used techniques which can not only detect the internal damage but also identify the fracture mode in structures. This study was aimed at evaluating the crack development in the concrete structure reinforced by CFRP laminates using AE along with on-line monitoring technique. In order to identify the internal fracture mode, the CFRP reinforced concrete specimens were made. Which have the variables of the steel ratio and the reinforcement area of CFRP laminates. Load steps were divided into four steps and AE source locations and energy and duration of AE parameters were estimated with respect to each load step. Based on the experimental results, the fracture mode of microcracks of concrete structure reinforced by CFRP laminates was examined.
Na, Tae Woong,Rahman, Md. Musfiqur,Park, Jong-Hyouk,Yang, Angel,Park, Ki Hun,El-Aty, A.M. Abd,Shim, Jae-Han 한국응용생명화학회 2012 Applied Biological Chemistry (Appl Biol Chem) Vol.55 No.5
Persistence and degradation behaviors of acequinocyl and hydroxyacequinocyl were determined in perilla leaf grown under greenhouse conditions. Acequinocyl (15%, SC) was sprayed on perilla leaf at the recommended dose rate of 37.5 g/250 L water/10a with single and double dose applications. Leaf samples were collected randomly at 0 (2 h after application), 1, 3, 5, and 7 days post-application from two different plots. The samples were extracted with acetonitrile, purified through a solid phase extraction procedure, and analyzed via ultra performance liquid chromatography coupled with photo diode array detector (UPLC-PDA). Residues were confirmed via liquid chromatography tandem mass spectrometry (LC-MS/MS) in positive-ion electrospray ionization ($ESI^+$) mode. Calibration curves were linear over the concentration ranges for the analytes with $r^2{\geq}0.992$. The limits of detection and quantification were 0.05 and 0.165 mg/kg for both acequinocyl and hydroxyacequinocyl. The method was validated in triplicate at two fortification concentrations in the matrix. Good recoveries were observed for the target analytes, ranging between 94.95 and 113.26% with relative standard deviations less than 6%. The rates of disappearance of total acequinocyl on perilla leaf for single and double doses were described as first-order kinetics with half-lives of 2.8 and 3.1-days, respectively.
Na, Chan Woong,Kim, Jae-Hyeok,Kim, Hyo-Joong,Woo, Hyung-Sik,Gupta, Arunava,Kim, Han-Ki,Lee, Jong-Heun Elsevier 2018 Sensors and actuators. B Chemical Vol.255 No.2
<P><B>Abstract</B></P> <P>Reduced graphene oxide (rGO)-In<SUB>2</SUB>O<SUB>3</SUB> hybrid materials were prepared by a solvothermal reaction of an In precursor containing rGO sheets, which were coated onto flexible substrates for gas sensors. The rGO-In<SUB>2</SUB>O<SUB>3</SUB> flexible sensors showed a high and reversible response (resistance ratio=22.3) to 500ppb NO<SUB>2</SUB> at 150°C and negligible cross-responses to C<SUB>2</SUB>H<SUB>5</SUB>OH, CO, NH<SUB>3</SUB>, toluene, H<SUB>2</SUB>, and HCHO. The ultrahigh response and selectivity of rGO-In<SUB>2</SUB>O<SUB>3</SUB> hybrid materials to NO<SUB>2</SUB> were attributed to the chemical affinity of rGO to NO<SUB>2</SUB> and the extension of the electron depletion layer in <I>n</I>-type In<SUB>2</SUB>O<SUB>3</SUB> forming a <I>p</I>-<I>n</I> junction with the <I>p</I>-type rGO.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Highly selective and sensitive NO<SUB>2</SUB> sensor using rGO-In<SUB>2</SUB>O<SUB>3</SUB> hybrid structures. </LI> <LI> Flexible gas sensors using polyimide film with ITO/Ag-Pd-Cu (APC)/ITO electrodes. </LI> <LI> High response (resistance ratio=22.3) to 0.5ppm NO<SUB>2</SUB> at 150°C. </LI> <LI> Negligible cross-responses to interference gases. </LI> </UL> </P>