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Inverse Relationship between Adipocyte Differentiation and Ceramide Level in 3T3-L1 Cells
Choi, Kyeong-Mi,Lee, Youn-Sun,Choi, Mi-Hwa,Sin, Dong-Mi,Lee, Seunghyun,Ji, So-Young,Lee, Mi Kyeong,Lee, Yong-Moon,Yun, Yeo-Pyo,Hong, Jin-Tae,Yoo, Hwan-Soo Pharmaceutical Society of Japan 2011 BIOLOGICAL & PHARMACEUTICAL BULLETIN Vol.34 No.6
<P>Adipocyte differentiation has been a target in anti-obesity strategies and is known to be closely related to lipid metabolism. Ceramide, a major sphingolipid metabolite, has been implicated in differentiation. In this study, we investigated whether ceramide biosynthesis is related to adipogenesis in 3T3-L1 cells. Preadipocytes can be differentiated synchronously by a mixture of adipogenic inducers including 3-isobutyl-1-methylxanthine, dexamethasone and insulin. The number of lipid droplets and the triglyceride content, which are differentiation biomarkers, gradually increased during adipogenesis. Interestingly, ceramide and sphingosine contents in the differentiated cells were decreased compared to those in preadipocytes. When the preadipocytes were treated with an 3-isobutyl-1-methylxanthine- or dexamethasone- or insulin-deficient mixture of inducers, the cellular ceramide levels were significantly increased compared with those in cells treated with the complete set of inducers. When preadipocytes were treated with 0, 0.1 or 1 μg/ml insulin along with 3-isobutyl-1-methylxanthine and dexamethasone, the ceramide levels were decreased and the triglyceride content was increased in a concentration-dependent manner. When the cells were treated with epigallocatechin gallate, an adipocyte differentiation inhibitor, during adipogenesis, the ceramide levels of adipocytes were increased and the fat content was decreased. In conclusion, our findings demonstrate that cellular ceramide levels are inversely correlated with adipocyte differentiation.</P>
Third Invasive Alien Species of Anoplophora: Establishment of Anoplophora horsfieldii in South Korea
Seunghyun Lee,Junhyeong Choi,Sangil Kim,Hyunkyu Jang,Woong Choi,Woochan Kwon,Doyoon Kim,Jaedong Gim,Jonghyun Park,Sangwook Park,Seunggwan Shin,Seunghwan Lee,Ming Bai 한국응용곤충학회 2022 한국응용곤충학회 학술대회논문집 Vol.2022 No.10
Seunghyun Choi,Lizhen Xu,Hye-Ji Kim 한국원예학회 2019 Horticulture, Environment, and Biotechnology Vol.60 No.6
This study was conducted to investigate the effects of physical properties of peat-based substrate mixtures partially substituted with parboiled rice hulls (PRH) on plant growth and performance. Thirteen substrate mixtures were formulated by substituting 0, 20, 30, 40, 50, 60, or 70% peat with either parboiled ground rice hulls (GRH) or whole rice hulls (WRH) (by volume) in commercial potting mix (CPM) containing 70% peat, 20% perlite, and 10% vermiculite. All substrate mixtures consisted of mainly medium-sized (2.0–0.25 mm) particles. However, regardless of the mixing ratio, GRH significantly increased the medium-sized particles especially with diameters of 2.0–0.71 mm, while WRH increased both the medium- and coarse-sized (> 2.0 mm) particles. A higher mixing ratio of PRH increased air space and decreased container capacity but to a greater extent by WRH compared to GRH. Similarly, bulk density was increased with a higher mixing ratio of both types of PRH, but to a greater degree by GRH. Total porosity of GRH-containing substrates was similar to that of CPM within the range of 30–70%. The substrate mixtures containing PRH did not have the same physical properties as the CPM at any mixing ratio, but the values of some GRH-containing mixtures were within or close to the suggested ranges for greenhouse substrates. Considering the maximum substitution of PRH for peat, the substitution with 40% GRH (GRH-40) was selected for a plant growth study in comparison to CPM. Petunia (Petunia × hybrida) ‘Easy Wave Neon Rose’ and zinnia (Zinnia elegans) ‘Benary’s Giant Golden Yellow’ were grown in pots containing CPM and GRH-40 at two irrigation levels: high (25–30%, by volume) and low (20–25%). Overall, shoot DW of both plant species was reduced in GRH-40, but root DW was maintained similar to those in CPM. The low irrigation level more significantly reduced shoot DW of petunia grown in CPM than in GRH-40, relative to their counterparts with the high irrigation level (20 and 7%, respectively); however, root growth of plant species grown in GRH-40 was either maintained or tended to be maintained even at the low irrigation level compared to their high irrigation counterparts. The water use efficiency of plants grown in GRH-40 was not significantly different from those in CPM regardless of irrigation level. These results indicate that GRH-40 provides desirable physical properties and water release characteristics, allowing more available water for plants under low irrigation levels than CPM. We concluded that substituting peat with 40% GRH in a commercial potting mix is a sustainable approach to produce petunia and zinnia.
Chemically driven carbon-nanotube-guided thermopower waves
Choi, Wonjoon,Hong, Seunghyun,Abrahamson, Joel T.,Han, Jae-Hee,Song, Changsik,Nair, Nitish,Baik, Seunghyun,Strano, Michael S. Nature Publishing Group 2010 NATURE MATERIALS Vol.9 No.5
Theoretical calculations predict that by coupling an exothermic chemical reaction with a nanotube or nanowire possessing a high axial thermal conductivity, a self-propagating reactive wave can be driven along its length. Herein, such waves are realized using a 7-nm cyclotrimethylene trinitramine annular shell around a multiwalled carbon nanotube and are amplified by more than 10<SUP>4</SUP> times the bulk value, propagating faster than 2 m s<SUP>−1</SUP>, with an effective thermal conductivity of 1.28±0.2 kW m<SUP>−1</SUP> K<SUP>−1</SUP> at 2,860 K. This wave produces a concomitant electrical pulse of disproportionately high specific power, as large as 7 kW kg<SUP>−1</SUP>, which we identify as a thermopower wave. Thermally excited carriers flow in the direction of the propagating reaction with a specific power that scales inversely with system size. The reaction also evolves an anisotropic pressure wave of high total impulse per mass (300 N s kg<SUP>−1</SUP>). Such waves of high power density may find uses as unique energy sources.
Process Derivation Methodology for Reconfigurable Smart Factory
Seunghyun Choi,Sekyoung Youm,Yong-Shin Kang 한국정밀공학회 2024 International Journal of Precision Engineering and Vol.25 No.3
Due to the development of computing technology, various data are collected and analyzed to extract meaningful information and are utilized in various industries. In particular, in the manufacturing industry, collected data are analyzed and used for process management, monitoring, quality prediction, etc., to establish smart factories and Reconfigurable Smart Factories. To continuously manage the processes of a Reconfigurable Smart Factory, it is necessary to derive a process model that includes factors affecting the process and to compare the actual execution process with the designed process and make improvements. The conventional methods for deriving process model are methods that apply to processes with a fixed start and end and are difficult to apply directly to the processes of a Reconfigurable Smart Factory. Furthermore, the conventional methods are sequential control flow-oriented, and a process derivation method that includes factors affecting the process is required. Therefore, it is necessary to consider various factors (e.g., time attributes, task time) that affect the process, not just the sequence, to solve this. In this study, we propose a novel method to derive a process that includes sequential flow and time conditions. The proposed methodology focuses on the execution time and order of instances to derive the process. Experiments were conducted by changing the conditions of the methodology and measuring the execution time to validate the proposed methodology.
Seunghyun Lee,Seunghwan Oh,Hyunkyu Jang,Woong Choi,Seunghwan Lee 한국응용곤충학회 2015 한국응용곤충학회 학술대회논문집 Vol.2015 No.04
The longhorn beetle (Coleoptera: Cucujiformia: Chrysomeloidea: Cerambycidae) is one of the major family of coleoptera which contains more than 30,000 species worldwide. Because of their species-diversity, morphological attraction and ecological status, the family has received a massive global attention. However, in Korea, no thorough study on this family has been conducted within last twenty eight years. Here we update the latest knowledge of Korean longhorn beetle fauna. First, we give an historical overview of the longhorn beetle studies in Korea and correct some common species misidentifications. Then we provide the information of updated cerambycidae fauna with 4 new species and 9 species newly reported to Korea. Lastly, we discuss the importance of studying immature stage of cerambycidae and provide brief morphological, ecological information of two recently described species.