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Biomimetic Micropatterning of Silica by Surface-Initiated Polymerization and Microcontact Printing
Kim, Dongx2005,Jin,Lee, Kyung-Bok,Lee, Tae ,Geol,Shon, Hyunx2005,Kyong,Kim, Wan-Joong,Paik, Hyun-jong,Choi, Insungx2005,S. WILEY-VCH Verlag 2005 Small Vol.1 No.10
<P>Micropatterns of silica on a gold substrate were generated by a biomimetic approach, namely, the biosilicification of silicic acids. The procedure consists of three simple steps: pattern generation of a polymerization initiator, (BrC(CH<SUB>3</SUB>)<SUB>2</SUB>COO(CH<SUB>2</SUB>)<SUB>11</SUB>S)<SUB>2</SUB>, by microcontact printing; surface-initiated, atom-transfer radical polymerization of 2-(dimethylamino)ethyl methacrylate (DMAEMA) from the patterned area; and polycondensation of silicic acids. The tertiary amine-containing polymer, pDMAEMA, aided in the spatially controlled polycondensation of silicic acids on surfaces in the presence of phosphate ions, and micropatterns of silica on a gold substrate were successfully generated in combination with the technique of microcontact printing. The procedure could be extended to the controlled fabrication of silica patterns with any size, shape, or thickness.</P> <B>Graphic Abstract</B> <P>A synthetic counterpart to silaffins in diatoms, pDMAEMA, was grown from a gold surface by pattern generation of a polymerization initiator and surface-initiated, atom-transfer radical polymerization. The patterns of pDMAEMA were utilized to generate patterns of silica on the surface by a biomimetic approach (see optical images). <img src='wiley_img/16136810-2005-1-10-SMLL200400157-content.gif' alt='wiley_img/16136810-2005-1-10-SMLL200400157-content'> </P>
Park, Jix2010,Hae,Jung, Yex2010,Jin,Antarx2005,Azizx2005,Mohamed, Mohamed,Hoonx2005,Lee, Tae,Lee, Changx2010,Ho,Han, Daeseok,Song, Myungx2010,Chong,Kim, Jiyoung,Baek, Namx2010,In WILEY‐VCH Verlag 2014 Helvetica chimica acta Vol.97 No.3
<P><B>Abstract</B></P><P>Two new bisabolane sesquiterpenoids, <B>1</B> and <B>2</B>, along with five known ones, 13‐hydroxyxanthorrhizol (<B>3</B>), 12,13‐epoxyxanthorrhizol (<B>4</B>), xanthorrhizol (<B>5</B>), <I>β</I>‐curcumene (<B>6</B>), and <I>β</I>‐bisabolol (<B>7</B>), were isolated from the rhizomes of <I>Curcuma xanthorrhiza</I> <SMALL>Roxb</SMALL><I>.</I> The chemical structures of the new compounds were determined to be (7<I>R</I>,10<I>R</I>)‐10,11‐dihydro‐10,11‐dihydroxyxanthorrhizol 3‐<I>O</I>‐<I>β</I>‐<SMALL>D</SMALL>‐glucopyranoside (<B>1</B>) and (−)‐curcuhydroquinone 2,5‐di‐<I>O</I>‐<I>β</I>‐<SMALL>D</SMALL>‐glucopyranoside (<B>2</B>) on the basis of 1D‐ and 2D‐NMR spectroscopic analyses and optical‐rotation characteristics. Compounds <B>2</B> and <B>3</B> decreased MMP‐1 expression in UVB‐treated human keratinocytes by <I>ca.</I> 8.9‐ and 7.6‐fold at the mRNA level, and by <I>ca.</I> 9.2‐ and 6.6‐fold at the protein level, respectively. The results indicate that the isolated compounds may have anti‐aging effects through inhibition of MMP‐1 expression in skin cells.</P>
Two New <i>C</i>‐<i>seco</i> Limonoids from the Fruit of <i>Melia azedarach</i>
Jin, Qinghao,Lee, Chul,Woox2005,Lee, Jin,Yeonx2005,Choi, Jeong,Tae ,Hong, Jin,Kim, Youngsoo,Kyeongx2005,Lee, Mi,Yeonx2005,Hwang, Bang WILEY‐VCH Verlag 2014 Helvetica chimica acta Vol.97 No.8
<P><B>Abstract</B></P><P>A phytochemical investigation of the fruits of <I>Melia azedarach</I> led to the isolation of two new C‐<I>seco</I>‐nimbolinin‐type limonoids, 3<I>α</I>‐acetoxy‐1<I>α</I>,7<I>α</I>‐dihydroxy‐12<I>α</I>‐methoxynimbolinin (<B>1</B>) and 3<I>α</I>‐acetoxy‐1<I>α</I>,12<I>α</I>‐dihydroxy‐7<I>α</I>‐(2‐methylprop‐2‐enoyl)nimbolinin (<B>2</B>), together with eleven known compounds, <B>3</B>–<B>13</B>. Their structures were elucidated on the basis of extensive spectroscopic analysis, including <SUP>1</SUP>H‐ and <SUP>13</SUP>C‐NMR, HMQC, HMBC, NOESY, and HR‐FAB‐MS.</P>