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Hwang, Yunjung,Park, Jeong Yong,Lee, Chang-Soo,Kwon, Oh Seok,Park, Sung-Hoon,Bae, Joonwon Elsevier 2018 Composites Applied science and manufacturing Vol.107 No.-
<P><B>Abstract</B></P> <P>This study demonstrated the sensing performance of surface-patterned poly(dimethylsiloxane) (PDMS)/carbon nanotube (CNT: 3–5 wt%) nanocomposite pads. PDMS/CNT nanocomposite pads as a flexible sensing platform were prepared by employing a series of techniques: 3-roll milling for mixing, 2-roll for pad formation, and imprinting for pattern development. Then, tailored surface engineering strategy was introduced. First, the silane coupling agent was incorporated to improve the surface compatibility of the nanocomposite pads. The change in surface property was monitored by shift in contact angle from 132 to 141°. Subsequently, the beta-cyclodextrin (CD) molecules were introduced as a sensing medium through a simple bio-conjugation reaction. The nanocomposite pads showed a sensitive response to methylparaben (MePRB), a representative preservative for cosmetics through host-guest interactions between CD and MePRB in the range of 1–100 nmol. Owing to the surface hydrophobicity of the nanocomposite pads, the sensor was found most effective under nonpolar solvents. The feasibility of surface engineered PDMS/CNT pad as a flexible sensor was demonstrated by measurement after 50 times manual bending. This study can be a useful example for the application of nanocomposites that show unique surface structure and properties.</P>
저소득층 학령기 아동ㆍ청소년 대상 건강관련 중재에 관한 체계적 문헌고찰
황지혜 ( Hwang Ji-hye ),최현지 ( Choi Hyunjee ),정효진 ( Jeong Hyo Jin ),김초롱 ( Kim Chorong ),우윤정 ( Woo Yunjung ) 서울대학교 간호과학연구소 2018 간호학의 지평 Vol.15 No.2
Purpose: The purpose of this study was to review health-related interventions in nursing studies for low-income school-age children and adolescents. Methods: Searches among CINAHL, MEDLINE, PubMed, EMBASE, DBpia, and RISS identified 27 intervention studies published from January 2000 to April 2018. Results: Twenty-seven intervention studies were identified: 12 included psychosocial adaptations and 15 included the healthy lifestyle promotion and disease prevention. The settings were mainly schools and community welfare centers. Many studies were based on social cognitive theory and interventions were provided in a group format. Depression, self-esteem, resilience, self-efficacy for vegetable and fruit consumption, physical activity, and health-related knowledge improved significantly after the health-related interventions. However, the findings were inconsistent with regard to anxiety, peer relationships, body mass index (BMI), blood pressure, cholesterol, and glucose. Conclusion: There is potential for enhancing outcomes for psychosocial, physical health, and health-related knowledge among low-income school-age children and adolescents. Integrated interventions addressing the physical as well as psychological health of low-income children and adolescents should be conducted. It would be prudent to consider the ethnicity and family background of the child or adolescent. However, rigorous study designs and scientific validation are needed for further evidence.
CHOI, YUNJUNG,LEE, YUREE,KIM, SOO YOUNG,LEE, YOUNGSOOK,HWANG, JAE‐,UNG Blackwell Publishing Ltd 2013 Plant, cell and environment Vol.36 No.5
<P><B>ABSTRACT</B></P><P>Auxin and abscisic acid (ABA) modulate numerous aspects of plant development together, mostly in opposite directions, suggesting that extensive crosstalk occurs between the signalling pathways of the two hormones. However, little is known about the nature of this crosstalk. We demonstrate that ROP‐interactive CRIB motif‐containing protein 1 (RIC1) is involved in the interaction between auxin‐ and ABA‐regulated root growth and lateral root formation. RIC1 expression is highly induced by both hormones, and expressed in the roots of young seedlings. Whereas auxin‐responsive gene induction and the effect of auxin on root growth and lateral root formation were suppressed in the <I>ric1</I> knockout, ABA‐responsive gene induction and the effect of ABA on seed germination, root growth and lateral root formation were potentiated. Thus, RIC1 positively regulates auxin responses, but negatively regulates ABA responses. Together, our results suggest that RIC1 is a component of the intricate signalling network that underlies auxin and ABA crosstalk.</P>
Arabidopsis ROP9 and ROP10 GTPases Differentially Regulate Auxin and ABA Responses
Choi, Yunjung,Lee, Youngsook,Hwang, Jae-Ung 한국식물학회 2014 Journal of Plant Biology Vol.57 No.4
Auxin and abscisic acid (ABA) are major plant hormones that act together to modulate numerous aspects of plant growth and development, including seed germination, primary root elongation, and lateral root formation. In this study, we analyzed the loss-of-function mutants of two closely related ROP (Rho of plants) GTPases, ROP9 and ROP10, and found that these ROP GTPases differentially regulate the auxin and ABA responses. rop9 and rop10 mutations enhanced the ABA-induced suppression of seed germination, primary root growth, and lateral root formation and the expression of ABA-responsive genes, whereas rop9 but not rop10 suppressed auxin-induced root phenotypes and auxin-responsive gene expression. These results suggest that both ROP9 and ROP10 function as negative regulators of ABA signaling, and that ROP9, but not ROP10, functions as a positive regulator of auxin signaling. Previously, ROP-interactive CRIB motif-containing protein 1 (RIC1) was reported to participate in auxin and ABA responses, and to have a similar effect as ROP9 and ROP10 on gene expression, root development, and seed germination. Because RIC proteins mediate ROP GTPase signaling, our results suggest that ROP9 and ROP10 GTPases function upstream of RIC1 in auxin- and ABA-regulated root development and seed germination.
배준원,Yunjung Hwang,Sung-Hoon Park,박선주,Jiyeon Lee,Hye Jun Kim,Ayeon Jang,Soyeon Park,Oh Seok Kwon 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.90 No.-
In this study, electrically conductive materials composed of carboxylated polypyrrole (PPy(COOH)) andnontoxic oligosaccharide molecules (cyclodextrin, CD) were prepared and incorporated intobiocompatible hydrogels for use as versatile sensors. The major component, carboxylated polypyrrolenanotubes (PPy(COOH) NTs) were fabricated using microemulsion polymerization and a critical sensingmedium CD molecule was introduced via a simple surface engineering method. The resulting PPy(COOH)-CD NT hybrid complexes were incorporated into a hydrogel matrix for biocompatibleapplications. Consequently, a convenient sensor geometry was constructed by mounting the hydrogelon a gold micropattern for the detection of toxic substances. The feasibility of the produced sensor systemwas demonstrated, and the sensor performance was measured extensively using electrical measure-ments. It was found that the sensor could detect a model compound (methyl paraben, MPRB) atconcentration as low as 1 nM. This study provides useful information for future research activities inrelevantfields.