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Visible‐Color‐Tunable Light‐Emitting Diodes
Hong, Young Joon,Lee, Chulx2010,Ho,Yoon, Aram,Kim, Miyoung,Seong, Hanx2010,Kyu,Chung, Hun Jae,Sone, Cheolsoo,Park, Yong Jo,Yi, Gyu‐,Chul WILEY‐VCH Verlag 2011 ADVANCED MATERIALS Vol.23 No.29
<P><B>Visible‐color‐tunable light‐emitting diodes (LEDs)</B> with electroluminescent color that changes continuously from red to blue by adjusting the external electric bias are fabricated using multifacetted GaN nanorods with anisotropically formed 3D InGaN multiple‐quantum wells. Monolithically integrated red, green, and blue LEDs on a single substrate, operating at a fixed drive current, are also demonstrated for inorganic full‐color LED display applications. </P>
Lee, Chulx2010,Ho,Kim, Yongx2010,Jin,Hong, Young Joon,Jeon, Seongx2010,Ran,Bae, Sukang,Hong, Byung Hee,Yi, Gyu‐,Chul WILEY‐VCH Verlag 2011 ADVANCED MATERIALS Vol.23 No.40
<P>Inorganic‐based flexible light‐emitting diodes (LEDs) using single‐crystalline GaN/ZnO coaxial nanorod heterostructures grown directly on large graphene films are reported on page 4614 by Gyu‐Chul Yi and co‐workers. The LEDs demon‐strate reliable operation in a flexible form, with no significant degradation in their electroluminescent or electrical characteristics. This approach provides a general and rational route to develop many different inorganic optoelectronics in flexible or stretchable forms. </P>
Kim, Yongx2010,Jin,Yoo, Hyobin,Lee, Chulx2010,Ho,Park, Jun Beom,Baek, Hyeonjun,Kim, Miyoung,Yi, Gyu‐,Chul WILEY‐VCH Verlag 2012 Advanced Materials Vol.24 No.41
<P>On page 5565, Gyu‐Chul Yi and co‐workers grow position‐ and morphology‐controlled ZnO nanowalls in prescribed positions on graphene layers. The nanowalls are grown to produce a variety of shapes from simple circles to text at the microscale. The selective growth of high quality ZnO nanowalls is investigated by electron microscopy and optical spectroscopy. The hybrid nanostructure can be exploited to fabricate various nanodevices including microarrays of nanotube LEDs. </P>
Control of neurite outgrowth by RhoA inactivation
Jeon, Chanx2010,Young,Moon, Mix2010,Young,Kim, Jongx2010,Hyun,Kim, Heex2010,Jun,Kim, Jaex2010,Gyu,Li, Yi,Jin, Jaex2010,Kwang,Kim, Pyeungx2010,Hyeun,Kim, Hyoungx2010,Chun,Meier, Kathryn Blackwell Publishing Ltd 2012 Journal of Neurochemistry Vol.120 No.5
<P><I>J. Neurochem.</I> (2012) <B>120</B>, 684–698.</P><P><B>Abstract</B></P><P>cAMP induces neurite outgrowth in the rat pheochromocytoma cell line 12 (PC12). In particular, di‐butyric cAMP (db‐cAMP) induces a greater number of primary processes with shorter length than the number induced by nerve growth factor (NGF). db‐cAMP up‐ and down‐regulates GTP‐RhoA levels in PC12 cells in a time‐dependent manner. Tat‐C3 toxin stimulates neurite outgrowth, whereas lysophosphatidic acid (LPA) and constitutively active (CA)‐RhoA reduce neurite outgrowth, suggesting that RhoA inactivation is essential for the neurite outgrowth from PC12 cells stimulated by cAMP. In this study, the mechanism by which RhoA is inactivated in response to cAMP was examined. db‐cAMP induces phosphorylation of RhoA and augments the binding of RhoA with Rho guanine nucleotide dissociation inhibitor (GDI). Moreover, RhoA (S188D) mimicking phosphorylated RhoA induces greater neurite outgrowth than RhoA (S188A) mimicking dephosphorylated form does. Additionally, db‐cAMP increases GTP‐Rap1 levels, and dominant negative (DN)‐Rap1 and DN‐Rap‐dependent RhoGAP (ARAP3) block neurite outgrowth induced by db‐cAMP. DN‐p190RhoGAP and the Src inhibitor PP2 suppress neurite outgrowth, whereas transfection of c‐Src and p190RhoGAP cDNAs synergistically stimulate neurite outgrowth. Taken together, RhoA is inactivated by phosphorylation of itself, by p190RhoGAP which is activated by Src, and by ARAP3 which is activated by Rap1 during neurite outgrowth from PC12 cells in response to db‐cAMP.</P>
The Topographic Effect of Zinc Oxide Nanoflowers on Osteoblast Growth and Osseointegration
Park, Jung Kyu,Kim, Yongx2010,Jin,Yeom, Junseok,Jeon, Ju Hyeong,Yi, Gyu‐,Chul,Je, Jung Ho,Hahn, Sei Kwang WILEY‐VCH Verlag 2010 Advanced Materials Vol.22 No.43
<P><B>ZnO nanoflowers</B> prepared by a solution‐based hydrothermal growth method result in effective osteoblast growth with higher DNA content, ALP activity, and adhesion strength than those on ZnO film. Furthermore, ZnO nanoflowers are tightly osseointegrated into the regenerated bones. The approach for fabricating nanoflower structures on biomaterial surfaces can be successfully exploited for various bone tissue engineering applications. </P>
Microstructures of GaN Thin Films Grown on Graphene Layers
Yoo, Hyobin,Chung, Kunook,Choi, Yong Seok,Kang, Chan Soon,Oh, Kyu Hwan,Kim, Miyoung,Yi, Gyu‐,Chul WILEY‐VCH Verlag 2012 ADVANCED MATERIALS Vol.24 No.4
<P><B>Plan‐view and cross‐sectional transmission electron microscopy</B> images show the microstructural properties of GaN thin films grown on graphene layers, including dislocation types and density, crystalline orientation and grain boundaries. The roles of ZnO nanowalls and GaN intermediate layers in the heteroepitaxial growth of GaN on graphene, revealed by cross‐sectional transmission electron microscopy, are also discussed.</P>