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Lee, Byeonghun,Lee, Saebom,Kim, Hyeonsoo,Jeong, Kijun,Park, Jinbyung,Lee, Eunyeol,Lee, Jinwon Kluwer Academic Publishers 2015 Biotechnology letters Vol.37 No.5
<P>To produce 10-ketostearic acid from oleic acid.</P>
Highly enhanced sensitivity of humidity-responsive PVP/PAA actuator containing MOF nanoparticles
Saebom Lee(이새봄),Minki Lee(이민기),Jinkee Lee(이진기) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
A humidity-responsive actuator expands or contracts in response to the ambient humidity. Bending performance of the actuator is determined by a variety of factors such as surface structures, materials and etc. In this study, we investigated the bending performances of the bilayer PVP/PAA actuators with different surface structures by changing the alignment of fibers and the thickness of the layer via electrospinning. First, we fabricated the PVP/PAA actuators electrospun at rotational speeds of 180, 1000, 1500 and 2000 rpm. The degree of the fiber alignment was improved as the rotational speed increased and the actuator with higher alignment showed the maximum curvature change when the relative humidity varied from 10% to 80 %. Furthermore, the layer thickness varied by controlling the electrospinning time and the result showed that the thicker actuator had larger curvature change but less sensitivity to humidity. Finally, we fabricated highly sensitive PVP/PAA actuator by adding metal-organic framework (MOF) nanoparticles. As a result, the MOF-actuator showed larger curvature change than the bare PVP/PAA actuator and higher sensitivity to humidity even though they had the same thickness because the MOF nanoparticles adsorbed the water molecules at even low humidity and reduced the adhesion between the layers.
Lee, Seol-Ae,Suh, Yeongjun,Lee, Saebom,Jeong, Jaehoon,Kim, Soo Jeong,Kim, So Jung,Park, Sang Ki Federation of American Societies for Experimental 2017 The FASEB Journal Vol. No.
<P>The dopaminergic system plays an essential role in various functions of the brain, including locomotion, memory, and reward, and the deregulation of dopaminergic signaling as a result of altered functionality of dopamine D2 receptor (DRD2) is implicated in multiple neurologic and psychiatric disorders. Tetraspanin-7 (TSPAN7) is expressed to variable degrees in different tissues, with the highest level in the brain, and multiple mutations in TSPAN7 have been implicated in intellectual disability. Here, we tested the hypothesis that TSPAN7 may be a binding partner of DRD2 that is involved in the regulation of its functional activity. Our results showed that TSPAN7 was associated with DRD2 and reduced its surface expression by enhancing DRD2 internalization. Immunocytochemical analysis revealed that TSPAN7 that resides in the plasma membrane and early and late endosomes promoted internalization of DRD2 and its localization to endosomal compartments of the endocytic pathway. Furthermore, we observed that TSPAN7 deficiency increased surface localization of DRD2 concurrent with the decrease of its endocytosis, regardless of dopamine treatment. Finally, TSPAN7 negatively affects DRD2-mediated signaling. These results disclosed a previously uncharacterized role of TSPAN7 in the regulation of the expression and functional activity of DRD2 by postendocytic trafficking.</P>
Lee, Saebom,Park, Seung-Tae,Earmme, Youn-Young,Chung, Dae-Youl The Korean Society of Mechanical Engineers 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.8
A problem of a circular elastic inhomogeneity interacting with a crack under uniform loadings (mechanical tension and heat flux at infinity) is solved. The singular. integral equations for edge and temperature dislocation distribution functions are constructed and solved numeric-ally, to obtain the stress intensity factors. The effects of the material property ratio on the stress intensity factor (SIF) are investigated. The computed SIFs are used to predict the kink angle of the crack when the crack grows.
Saebom Lee,Seung Tae Choi,Youn Young Earmme,Dae Youl Chung 대한기계학회 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.8
A problem of a circular elastic inhomogeneity interacting with a crack under uniform loadings (mechanical tension and heat flux at infinity) is solved. The singular integral equations for edge and temperature dislocation distribution functions are constructed and solved numerically. to obtain the stress intensity factors. The effects of the material property ratio on the stress intensity factor (SlF) are investigated. The computed SIFs are used to predict the kink angle of the crack when the crack grows.