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Lee, Jeongjoon,Lee, Inseon,Nam, Jahyun,Hwang, Dong Soo,Yeon, Kyung-Min,Kim, Jungbae American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.18
<P>Acylase (AC) was immobilized and stabilized on carboxylated polyaniline nanofibers (cPANFs) for the development of antifouling nanobiocatalysts with high enzyme loading and stability. AC was immobilized via three different approaches: covalent attachment (CA), enzyme coating (EC), and magnetically separable enzyme precipitate coating (Mag-EPC). The enzyme activity per unit weight of cPANFs with Mag-EPC was 75 and 300 times higher than that of those with CA and EC, respectively, representing improved enzyme loading in the form of Mag-EPC. After incubation under shaking at 200 rpm for 20 days, Mag-EPC maintained 55% of its initial activity, whereas CA and EC showed 3 and 16% of their initial activities, respectively. The antifouling of highly loaded and stable Mag-EPC against the biofouling/biofilm formation of Pseudomonas aeruginosa was tested under static- and continuous-flow conditions. Biofilm formation in the presence of 40,mu g/mL Mag-EPC under static condition was 5 times lower than that under control condition with no addition of Mag-EPC. Under continuous membrane filtration, Mag-EPC delayed the increase of transmembrane pressure (TMP) more effectively as the concentration of added Mag-EPC increased. When separating Mag-EPC and membranes in two different vessels under internal circulation of the culture solution, Mag-EPC maintained a higher permeability than the control with no Mag-EPC addition. It was also confirmed that the addition of Mag-EPC reduced the generation of N-acyl homoserine lactone (AHL) autoinducers. This result reveals that the inhibition of biofilm formation and biofouling in the presence of Mag-EPC is due to the hydrolysis of AHL autoinducers, catalyzed by the immobilized and stabilized AC in the form of Mag-EPC. Mag-EPC of AC with high enzyme loadings and improved stability has demonstrated its great potential as an antifouling agent by reducing biofilm formation and membrane biofouling based on 'enzymatic quorum quenching' of autoinducers.</P>
Graphene-templated directional growth of an inorganic nanowire
Lee, Won Chul,Kim, Kwanpyo,Park, Jungwon,Koo, Jahyun,Jeong, Hu Young,Lee, Hoonkyung,Weitz, David A.,Zettl, Alex,Takeuchi, Shoji Nature Publishing Group, a division of Macmillan P 2015 Nature nanotechnology Vol.10 No.5
Assembling inorganic nanomaterials on graphene is of interest in the development of nanodevices and nanocomposite materials, and the ability to align such inorganic nanomaterials on the graphene surface is expected to lead to improved functionalities, as has previously been demonstrated with organic nanomaterials epitaxially aligned on graphitic surfaces. However, because graphene is chemically inert, it is difficult to precisely assemble inorganic nanomaterials on pristine graphene. Previous techniques based on dangling bonds of damaged graphene, intermediate seed materials and vapour-phase deposition at high temperature<SUP>,</SUP> have only formed randomly oriented or poorly aligned inorganic nanostructures. Here, we show that inorganic nanowires of gold(I) cyanide can grow directly on pristine graphene, aligning themselves with the zigzag lattice directions of the graphene. The nanowires are synthesized through a self-organized growth process in aqueous solution at room temperature, which indicates that the inorganic material spontaneously binds to the pristine graphene surface. First-principles calculations suggest that this assembly originates from lattice matching and π interaction to gold atoms. Using the synthesized nanowires as templates, we also fabricate nanostructures with controlled crystal orientations such as graphene nanoribbons with zigzag-edged directions.
( Jahyun Hwang ),( Juyeon Kang ),( Hyun Jung Lee ),( Yoon Hee Lee ),( Gun Oh Chong ),( Dae Gy Hong ),( Yoon Soon Lee ) 대한산부인과학회 2020 대한산부인과학회 학술대회 Vol.106 No.-
Objective: This study aimed to compare the surgical outcomes between robot single-site myomectomy (RSSM) and robot multiport myomectomy (RMPM) by using of a propensity score matching analysis. Methods: We anayzed retrospectively 81 patients who underwent RSSM and 129 patients who underwent RMPM. Fifty-nine patients were selected for each group. A propensity score matching analysis was performed to control selection bias using 11 variables, age, gravida, parity, body mass index, previous history of pelvic surgery, preoperative hemoglobin level, preoperative C reactive protein level, size, number, types and weights of myomas Results: Patient characteristics and surgical outcomes of the matched RSSM group were comparable to those of the matched RMPM group, except for shorter hospital stay (3 vs 4 d; P = .019) and shorter operation time. (107 vs 140 min; P = .000). Conclusion: After matching of weights, numbers, size, and types of myoma with other variables, this study found that RSSM provides the benefits of shorter hospital stay and shorter operation times compared with RMPM.
Metal microparticle – Polymer composites as printable, bio/ecoresorbable conductive inks
Lee, Seungae,Koo, Jahyun,Kang, Seung-Kyun,Park, Gayoung,Lee, Yung Jong,Chen, Yu-Yu,Lim, Seon Ah,Lee, Kyung-Mi,Rogers, John A. Elsevier 2018 Materials today Vol.21 No.3
<P>Biologically and environmentally resorbable electronic devices support application possibilities that cannot be addressed with conventional technologies. This paper presents highly conductive, water-soluble composites that can be printed to form contacts, interconnects, antennas, and other important features that are essential to nearly all systems of this type. An optimized material formulation involves in situ polymerization to yield a polyanhydride containing a dispersion of molybdenum microparticles at appropriate concentrations. Comparisons of essential physical and electrical properties of these materials to those of composites formed with other polymers and other metal microparticles reveal the relevant considerations. Various functional demonstrations of screen-printed test structures and devices illustrate the suitability of these conductive inks for use in water-soluble electronic devices. A key advantage of the material introduced here compared to alternatives is its ability to maintain conductance over significant periods of time while immersed in relevant aqueous solutions. Studies involving live animal models establish the biocompatibility.</P>