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GNAPAREDDYBRAMARAMBA,Pragati Madhukar Deore,Sreekantha Reddy Dugasani,김승재,박성하,Sung Ha Park 한국물리학회 2018 Current Applied Physics Vol.18 No.11
In this paper, we demonstrate the feasibility of constructing DNA nanostructures (i.e. DNA rings and doublecrossover (DX) DNA lattices) with appropriate doxorubicin hydrochloride (DOX) concentration and reveal significant characteristics for specific applications, especially in the fields of biophysics, biochemistry and medicine. DOX-intercalated DNA rings and DX DNA lattices are fabricated on a given substrate using the substrateassisted growth method. For both DNA rings and DX DNA lattices, phase transitions from crystalline to amorphous, observed using atomic force microscopy (AFM) occurred above a certain concentration of DOX (at a critical concentration of DOX, 30 μM of [DOX]C) at a fixed DNA concentration. Additionally, the coverage percentage of DNA nanostructures on a given substrate is discussed in order to understand the crystal growth mechanism during the course of annealing. Lastly, we address the significance of optical absorption and photoluminescence characteristics for determining the appropriate DOX binding to DNA molecules and the energy transfer between DOX and DNA, respectively. Both measurements provide evidence of DOX doping and [DOX]C in DNA nanostructures.
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Gnapareddy, Bramaramba,Ahn, Sang Jung,Dugasani, Sreekantha Reddy,Kim, Jang Ah,Amin, Rashid,Mitta, Sekhar Babu,Vellampatti, Srivithya,Kim, Byeonghoon,Kulkarni, Atul,Kim, Taesung,Yun, Kyusik,LaBean, Tho Elsevier 2015 Colloids and Surfaces B Vol.135 No.-
<P><B>Abstract</B></P> <P>We present two free-solution annealed DNA nanostructures consisting of either cross-tile CT1 or CT2. The proposed nanostructures exhibit two distinct structural morphologies, with one-dimensional (1D) nanotubes for CT1 and 2D nanolattices for CT2. When we perform mica-assisted growth annealing with CT1, a dramatic dimensional change occurs where the 1D nanotubes transform into 2D nanolattices due to the presence of the substrate. We assessed the coverage percentage of the 2D nanolattices grown on the mica substrate with CT1 and CT2 as a function of the concentration of the DNA monomer. Furthermore, we fabricated a scaffold cross-tile (SCT), which is a new design of a modified cross-tile that consists of four four-arm junctions with a square aspect ratio. For SCT, eight oligonucleotides are designed in such a way that adjacent strands with sticky ends can produce continuous arms in both the horizontal and vertical directions. The SCT was fabricated <I>via</I> free-solution annealing, and self-assembled SCT produces 2D nanolattices with periodic square cavities. All structures were observed <I>via</I> atomic force microscopy. Finally, we fabricated divalent nickel ion (Ni<SUP>2+</SUP>)- and trivalent dysprosium ion (Dy<SUP>3+</SUP>)-modified 2D nanolattices constructed with CT2 on a quartz substrate, and the ion coordinations were examined <I>via</I> Raman spectroscopy.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We present free-solution annealed DNA nanotubes and DNA nanolattices consisting of cross-tiles (CT1 and CT2) and a scaffold cross-tile (SCT). </LI> <LI> When we perform mica-assisted growth annealing with CT1, a dimensional change occurs where the 1D nanotubes transform into 2D nanolattices. </LI> <LI> We assessed the coverage percentage of the 2D nanolattices grown on the mica substrate as a function of the DNA concentration. </LI> <LI> Finally, we fabricated divalent and trivalent ion-modified 2D nanolattices which were examined via Raman spectroscopy. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Structural stability and electrical characteristic of DNA lattices doped with lanthanide ions
레디,GNAPAREDDYBRAMARAMBA,김장아,유상현,황태현,김태성,박성하 한국물리학회 2017 Current Applied Physics Vol.17 No.11
The main aim of doping DNA lattices with lanthanide ions (Ln-DNA complex) is to change the physical functionalities for specific target applications such as electronics and biophotonics. LneDNA complexes based on a double-crossover DNA building block were fabricated on glass using a substrate-assisted growth method. We demonstrated the structural stability of LneDNA complexes as a function of Ln ion concentration by the atomic force microscopy. The Ln ion doping in DNA lattices was examined using a chemical reduction process, and the electrical characteristics of LneDNA complexes were tested using a semiconductor parameter analyzer. The structural phase transition of DNA lattices from the crystalline to amorphous phases occurred at a certain critical concentration of each Ln ion. Ln ions in DNA lattices are known to be intercalated between the base pairs and bound with phosphate backbones. When DNA lattices are properly doped with Ln ions, LneDNA complexes revealed the complete deformation with chemical reduction process by ascorbic acid. The current increased up to a critical Ln ion concentration and then decreased with further increasing Ln ions. LneDNA complexes will be useful in electronics and photonics because of their unique physical characteristics.
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Sreekantha Reddy Dugasani,GNAPAREDDYBRAMARAMBA,Mallikarjuna Reddy Kesama,하태환,박성하 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.68 No.-
Although the intrinsic characteristics of DNA molecules and carbon nanotubes (CNT) are well known, fabrication methods and physical characteristics of CNT-embedded DNA thin films are rarely investigated. We report the construction and characterization of carboxyl (–COOH) group-modified multi-walled carbon nanotube (MWCNT–COOH)-embedded DNA and cetyltrimethyl-ammonium chloride-modified DNA (DNA–CTMA) composite thin films. Here, we examine the structural, compositional, chemical, spectroscopic, and electrical characteristics of DNA and DNA–CTMA thin films consisting of various concentrations of MWCNT–COOH. The MWCNT–COOH-embedded DNA and DNA–CTMA composite thin films may offer a platform for developing novel optoelectronics, energy harvesting, and sensing applications in physical, chemical, and biological sciences.
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