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( Peter Tompa ),( Kyou-hoon Han ),( Monika Bokor ),( Pawel Kamasa ),( Agnes Tantos ),( Beata Fritz ),( Do-hyoung Kim ),( Chewook Lee ),( Tamas Verebelyi ),( Kalman Tompa ) 생화학분자생물학회(구 한국생화학분자생물학회) 2016 BMB Reports Vol.49 No.9
Wide-line ¹H NMR intensity and differential scanning calorimetry measurements were carried out on the intrinsically disordered 73-residue full transactivation domain (TAD) of the p53 tumor suppressor protein and two peptides: one a wild type p53 TAD peptide with a helix pre-structuring property, and a mutant peptide with a disabled helix-forming propensity. Measurements were carried out in order to characterize their water and ion binding characteristics. By quantifying the number of hydrate water molecules, we provide a microscopic description for the interactions of water with a wild-type p53 TAD and two p53 TAD peptides. The results provide direct evidence that intrinsically disordered proteins (IDPs) and a less structured peptide not only have a higher hydration capacity than globular proteins, but are also able to bind a larger amount of charged solute ions. [BMB Reports 2016; 49(9): 497-501]
Intrinsic Controllable Magnetism of Graphene Grown on Fe
Hong, Jeongmin,Kim, Yooseok,Liang, Jinghua,Chen, Hong,Park, Chong-Yun,Yang, Hongxin,Santos, Elton J. G.,Bokor, Jeffrey,Hwang, Chan-Cuk,You, Long American Chemical Society 2019 JOURNAL OF PHYSICAL CHEMISTRY C - Vol.123 No.44
<P>Novel functional materials that use both the spin and charge of an electron offer many exciting opportunities to create new information processing and storage devices with ultralow power consumption. The recent discovery of magnetism in atomically thin-layered materials could boost research in the field of light element materials such as van der Waals magnetic nanostructures. Here, we report intrinsic magnetization in large-area graphene grown on Fe(100) foil structures. The optimal growth mechanisms provide high-quality graphene samples with controllable magnetic properties, such as thickness-dependent magnetization. Using first-principles calculations, we investigated several possible scenarios for controlling the magnetic properties. Moreover, the independent magnetic structures induced in graphene were identified through field-applied magnetic force microscopy (FA-MFM) followed by vibrating sample magnetometry (VSM). Our results open a new avenue for controlling the magnetic properties of graphene structures by mediating surface growth on regular magnets for applications in large-scale spintronics.</P> [FIG OMISSION]</BR>
Wu, J,Carlton, D,Oelker, E,Park, J S,Jin, E,Arenholz, E,Scholl, A,Hwang, Chanyong,Bokor, J,Qiu, Z Q IOP Pub 2010 Journal of Physics, Condensed Matter Vol.22 No.34
<P>Epitaxial Py/Cu/Co/Cu(001) trilayers were patterned into micron sized disks and imaged using element-specific photoemission electron microscopy. By varying the Cu spacer layer thickness, we study how the coupling between the two magnetic layers influences the formation of magnetic vortex states. We find that while the Py and Co disks form magnetic vortex domains when the interlayer coupling is ferromagnetic, the magnetic vortex domains of the Py and Co disks break into anti-parallel aligned multidomains when the interlayer coupling is antiferromagnetic. We explain this result in terms of magnetic flux closure between the Py and Co layers for the antiferromagnetic coupling case.</P>
Liang, Xiaogan,Jung, Yeon-Sik,Wu, Shiwei,Ismach, Ariel,Olynick, Deirdre L.,Cabrini, Stefano,Bokor, Jeffrey American Chemical Society 2010 NANO LETTERS Vol.10 No.7
<P>We fabricated hexagonal graphene nanomeshes (GNMs) with sub-10 nm ribbon width. The fabrication combines nanoimprint lithography, block-copolymer self-assembly for high-resolution nanoimprint template patterning, and electrostatic printing of graphene. Graphene field-effect transistors (GFETs) made from GNMs exhibit very different electronic characteristics in comparison with unpatterned GFETs even at room temperature. We observed multiplateaus in the drain current−gate voltage dependence as well as an enhancement of ON/OFF current ratio with reduction of the average ribbon width of GNMs. These effects are attributed to the formation of electronic subbands and a bandgap in GNMs. Such mesoscopic graphene structures and the nanofabrication methods could be employed to construct future electronic devices based on graphene superlattices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2010/nalefd.2010.10.issue-7/nl100750v/production/images/medium/nl-2010-00750v_0005.gif'></P>