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Rethinasabapathy, Muruganantham,Kang, Sung-Min,Lee, Ilsong,Lee, Go-Woon,Lee, Sunmook,Roh, Changhyun,Huh, Yun Suk Elsevier 2019 Materials letters Vol.241 No.-
<P><B>Abstract</B></P> <P>In this work, a Prussian blue (PB)/graphene oxide (GO)/chitosan (CS) organic-inorganic composite was successfully synthesized and utilized as an adsorbent for the selective removal of cesium (Cs<SUP>+</SUP>) ions. Taking the advantage of synergistic effect GO, CS and PB nanoparticles, the PB/GO/CS composite exhibited maximum adsorption capacity of 48.35 mg g<SUP>−1</SUP> for Cs<SUP>+</SUP> ions. In the presence of competitive monovalent cations (K<SUP>+</SUP> and Na<SUP>+</SUP>), PB/GO/CS showed excellent selectivity (86%) for Cs<SUP>+</SUP> ions and had a 6-fold higher distribution coefficient (<I>K</I> <SUB>d</SUB>) than GO/CS. This enhanced adsorption capacity with high selectivity of PB/GO/CS for Cs<SUP>+</SUP> ions may have been attributed to (i) the presence of carboxylic, hydroxyl and amino functional groups on GO/CS matrix which strongly bind Cs<SUP>+</SUP> ions through electrostatic attraction and chelation, and (ii) the trapping of Cs<SUP>+</SUP> ions by the voids of the FCC-structured PB lattice whose size is equivalent to the hydration radius of Cs<SUP>+</SUP> ions. Due to its low-cost, facile preparation, high adsorption capacity, and superior Cs<SUP>+</SUP> ions selectivity, PB/GO/CS is a promising material for the selective removal of the Cs<SUP>+</SUP> ions from the environment and for protecting ecosystems from the radiation hazards.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Low-cost organic-inorganic hybrid adsorbent for the selective removal of radioactive Cs. </LI> <LI> Exhibit high cesium (Cs) adsorption capacity of 48.35 mg g<SUP>−1</SUP>. </LI> <LI> Confer high structural stability due to strong electrostatic interaction between GO and CS. </LI> <LI> Excellent selectivity for Cs as the hydration radius of Cs matches with the void size of the PB lattice. </LI> <LI> Easy recovery of PB after Cs adsorption by immobilizing it with GO/CS matrix. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
An isoflavone compound daidzein elicits myoblast differentiation and myotube growth
Lee, S.J.,Vuong, T.A.,Go, G.Y.,Song, Y.J.,Lee, S.,Lee, S.Y.,Kim, S.W.,Lee, J.,Kim, Y.K.,Seo, D.W.,Kim, K.H.,Kang, J.S.,Bae, G.U. ELSEVIER SCIENCE B.V.; AMSTERDAM 2017 JOURNAL OF FUNCTIONAL FOODS Vol.38 No.1
Preservation of muscle stem cell function is critical for muscle homeostasis and the regenerative capacity of stem cells declines with age, leading to muscle loss. Previously, daidzein, a natural isoflavone from Leguminosae, has been shown to prevent TNF-α-induced muscle atrophy. However, the molecular mechanisms of daidzein in these processes are currently unknown. In this study, we demonstrate a positive effect of black soybean extract (BS Ext) and daidzein on myoblast differentiation and myotube growth. Daidzein prevents dexamethasone-induced myotube atrophy through Akt activation. The promyogenic effect of BS Ext and daidzein is mediated through two promyogenic kinases, Akt and p38MAPK that in turn activates a key myogenic transcription factor MyoD. Additionally, BS Ext and daidzein promote myotube growth through Akt/mTOR/S6K pathway. Finally, daidzein augments MyoD-dependent myogenic conversion of mouse embryonic fibroblasts. Taken together, our data suggest that daidzein promotes myogenic differentiation and myotube hypertrophy through p38 and Akt/mTOR/S6K pathway.
Lee, Soo-Yeon,Go, Ga-Yeon,Vuong, Tuan Anh,Kim, Jee Won,Lee, Sullim,Jo, Ayoung,An, Jun Min,Kim, Su-Nam,Seo, Dong-Wan,Kim, Jin-Seok,Kim, Yong Kee,Kang, Jong-Sun,Lee, Sang-Jin,Bae, Gyu-Un The Korean Society of Ginseng 2018 Journal of Ginseng Research Vol.42 No.1
Background: Black ginseng (BG) has greatly enhanced pharmacological activities relative to white or red ginseng. However, the effect and molecular mechanism of BG on muscle growth has not yet been examined. In this study, we investigated whether BG could regulate myoblast differentiation and myotube hypertrophy. Methods: BG-treated C2C12 myoblasts were differentiated, followed by immunoblotting for myogenic regulators, immunostaining for a muscle marker, myosin heavy chain or immunoprecipitation analysis for myogenic transcription factors. Results: BG treatment of C2C12 cells resulted in the activation of Akt, thereby enhancing hetero-dimerization of MyoD and E proteins, which in turn promoted muscle-specific gene expression and myoblast differentiation. BG-treated myoblasts formed larger multinucleated myotubes with increased diameter and thickness, accompanied by enhanced Akt/mTOR/p70S6K activation. Furthermore, the BG treatment of human rhabdomyosarcoma cells restored myogenic differentiation. Conclusion: BG enhances myoblast differentiation and myotube hypertrophy by activating Akt/mTOR/p70S6k axis. Thus, our study demonstrates that BG has promising potential to treat or prevent muscle loss related to aging or other pathological conditions, such as diabetes.
Lee Haeun,Lee Dong-Geol,Jo HyungWoo,Heo Young Mok,Baek Chaeyun,Kim Hye-Been,COSMAX BTI,Kang Seunghyun,Lee Wooseok,Mun Seyoung,Han Kyudong 한국유전학회 2024 Genes & Genomics Vol.46 No.4
Background The skin microbiome is essential in guarding against harmful pathogens and responding to environmental changes by generating substances useful in the cosmetic and pharmaceutical industries. Among these microorganisms, Streptococcus is a bacterial species identified in various isolation sources. In 2021, a strain of Streptococcus infantis, CX-4, was identified from facial skin and found to be linked to skin structure and elasticity. As the skin-derived strain differs from other S. infantis strains, which are usually of oral origin, it emphasizes the significance of bacterial variation by the environment. Objective This study aims to explore the unique characteristics of the CX-4 compared to seven oral-derived Streptococcus strains based on the Whole-Genome Sequencing data, focusing on its potential role in skin health and its possible application in cosmetic strategies. Methods The genome of the CX-4 strain was constructed using PacBio Sequencing, with the assembly performed using the SMRT protocol. Comparative whole-genome analysis was then performed with seven closely related strains, utilizing web-based tools like PATRIC, OrthoVenn3, and EggNOG-mapper, for various analyses, including protein association analysis using STRING. Results Our analysis unveiled a substantial number of Clusters of Orthologous Groups in diverse functional categories in CX-4, among which sphingosine kinase (SphK) emerged as a unique product, exclusively present in the CX-4 strain. SphK is a critical enzyme in the sphingolipid metabolic pathway, generating sphingosine-1-phosphate. The study also brought potential associations with isoprene formation and retinoic acid synthesis, the latter being a metabolite of vitamin A, renowned for its crucial function in promoting skin cell growth, differentiation, and maintaining of skin barrier integrity. These findings collectively suggest the potential of the CX-4 strain in enhancing of skin barrier functionality. Conclusion Our research underscores the potential of the skin-derived S. infantis CX-4 strain by revealing unique bacterial compounds and their potential roles on human skin. Background The skin microbiome is essential in guarding against harmful pathogens and responding to environmental changes by generating substances useful in the cosmetic and pharmaceutical industries. Among these microorganisms, Streptococcus is a bacterial species identified in various isolation sources. In 2021, a strain of Streptococcus infantis, CX-4, was identified from facial skin and found to be linked to skin structure and elasticity. As the skin-derived strain differs from other S. infantis strains, which are usually of oral origin, it emphasizes the significance of bacterial variation by the environment. Objective This study aims to explore the unique characteristics of the CX-4 compared to seven oral-derived Streptococcus strains based on the Whole-Genome Sequencing data, focusing on its potential role in skin health and its possible application in cosmetic strategies. Methods The genome of the CX-4 strain was constructed using PacBio Sequencing, with the assembly performed using the SMRT protocol. Comparative whole-genome analysis was then performed with seven closely related strains, utilizing web-based tools like PATRIC, OrthoVenn3, and EggNOG-mapper, for various analyses, including protein association analysis using STRING. Results Our analysis unveiled a substantial number of Clusters of Orthologous Groups in diverse functional categories in CX-4, among which sphingosine kinase (SphK) emerged as a unique product, exclusively present in the CX-4 strain. SphK is a critical enzyme in the sphingolipid metabolic pathway, generating sphingosine-1-phosphate. The study also brought potential associations with isoprene formation and retinoic acid synthesis, the latter being a metabolite of vitamin A, renowned for its crucial function in promoting skin cell growth, differentiation, and maintaining of skin barrier integrity. These findings collectively suggest the potential of the CX-4 strain in enhancing of skin barrier functionality. Conclusion Our research underscores the potential of the skin-derived S. infantis CX-4 strain by revealing unique bacterial compounds and their potential roles on human skin.
Giant Spin-orbit Torques Induced by Orbital Hall Effect
Soogil Lee,Junho Kang,Taekhyeon Lee,Jung-Mok Kim,Dohyoung Kim,Heechan Jang,Eun Kang Park,Dongwook Go,Nyun Jong Lee,Yoshinori Kotani,Yoichi Shiota,Teruo Ono,S. Sonny Rhim,Kyung-Jin Lee,Hyun-Woo Lee,Kab 한국자기학회 2019 한국자기학회 학술연구발표회 논문개요집 Vol.29 No.2
이강석(Lee Kang Seok),양빈화(Yang Been-Hee),최창식(Choi Chang-Sik),이리형(Lee Li-Hyung) 한국구조물진단유지관리학회 2005 한국구조물진단학회 학술발표회논문집 Vol.- No.-
Recently. as many earthquakes have been increased in Korea, the school building has been highy functioned as a shelter when earthquake occurs. The main purpose of this paper is to evaluate the seismic capacity of school building expected to provide an appropriate refuge facility in the case of occurrence of severe earthquake. In this paper, the Japanese Standard for Evaluation of Seismic Capacity of Existing RC Building is introduced and the seismic capacity of a school building designed in accordance with the Korean Building Code is evaluated based on the Japanese Standard.