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Antibacterial Effect of Silver and Gold Nanoparticle Coated Modified C-Palatal Plate
Park, Song-E.,Ko, Wan-Kyu,Park, Jae Hyun,Bayome, Mohamed,Park, Justyn,Heo, Dong Nyoung,Lee, Sang Jin,Moon, Ji-Hoi,Kwon, Il Keun,Kook, Yoon-Ah American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.8
<P>The goal of this study was to investigate antibacterial properties and cell viability of a covalently immobilized gold and silver nanoparticle coated titanium modified C-palatal plate (MCPP) surfaces. Silver and gold nanoparticle-coated titanium (Ti-nAg, Ti-nAu) surfaces were prepared using the silanization method. The amount of deposited nanoparticles (NPs), surface morphology, and chemical component analysis of the surfaces were characterized. The antibacterial qualities of the Ti-nAg and Ti-nAu surfaces were tested on Porphyromonas gingivalis (P. ginginalis) and Aggregatibacter actinomycetemcomitans (A. actinomycetemcomitans). The cytotoxicity of the treated surfaces to NIH3T3 cells was assessed. The Ti-nAg surface had remarkable antibacterial effect compared to the Ti-nAu. However, it showed cell cytotoxicity after 2 days of incubation, whereas Ti-nAu displayed better cell compatibility.</P>
Luminescent Calix[4]arene-Based Metallogel Formed at Different Solvent Composition
Park, Jaehyeon,Lee, Ji Ha,Jaworski, Justyn,Shinkai, Seiji,Jung, Jong Hwa American Chemical Society 2014 Inorganic Chemistry Vol.53 No.14
<P>We have synthesized a calix[4]arene derivative (<B>1</B>) containing terpyridine and showed that gelation occurred in the presence of Pt<SUP>2+</SUP> in DMSO/H<SUB>2</SUB>O of varying compositions. Gelation was presumably mediated by the Pt–Pt and π–π stacking interactions. The scanning electron microscopy image of the xerogel showed a spherical structure with diameter of 1.8–2.1 μm. Interestingly, the metallogel showed strong luminescence enhancement, which was dependent on the DMSO/H<SUB>2</SUB>O ratio of the solvent. We examined the effects of concentration, temperature, and time resolution on the luminescence emission of both the gel <B>1</B>-Pt<SUP>2+</SUP> and the sol <B>1</B>-Pt<SUP>2+</SUP>. The luminescence lifetimes of the metallogel were particularly long, on the order of several microseconds. The luminescence lifetimes were also strongly dependent on the solvent composition. We also determined the thermodynamic parameters for the self-assembly of the gel by the Birks kinetic scheme. Furthermore, the rheological properties of the metallogels in the presence of more than 4.0 equiv of Pt<SUP>2+</SUP> were independent of the concentration of Pt<SUP>2+</SUP> applied.</P><P>A calix[4]arene derivative containing terpyridine was synthesized, and it was shown that gelation occurred in the presence of Pt<SUP>2+</SUP> in solutions of DMSO/H<SUB>2</SUB>O of varying compositions. Interestingly, the metallogel showed strong luminescence enhancement, which depended on the DMSO/H<SUB>2</SUB>O ratio of the solvent.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/inocaj/2014/inocaj.2014.53.issue-14/ic500266f/production/images/medium/ic-2014-00266f_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ic500266f'>ACS Electronic Supporting Info</A></P>
Reversibly tunable helix inversion in supramolecular gels trigged by Co<sup>2+</sup>
Park, So Hyeon,Jung, Sung Ho,Ahn, Junho,Lee, Ji Ha,Kwon, Ki-Young,Jeon, Jiwon,Kim, Hyungjun,Jaworski, Justyn,Jung, Jong Hwa The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.88
<P>Terpyridine-based ligands form octahedral complexes with Co<SUP>2+</SUP> at low cation concentrations to form helical assemblies which provide a supramolecular gel framework. Increasing the Co<SUP>2+</SUP> concentration above 0.6 equiv. reveals a second, co-existing square pyramidal complex derived assembly, having a distinct helicity. While this geometry dominates at 1 equiv. of Co<SUP>2+</SUP>, we find this unique form of helical inversion to be fully reversible and controllable.</P> <P>Graphic Abstract</P><P>Terpyridine-based ligands form octahedral complexes with Co<SUP>2+</SUP> at low cation concentrations to form helical assemblies which provide a supramolecular gel framework. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc05699j'> </P>
Moon, Seung Jin,Park, So Hyeon,Jaworski, Justyn,Jung, Jong Hwa The Royal Society of Chemistry 2013 Chemical communications Vol.49 No.99
<P>A unique system has been developed for quantifying G-quadruplex forming DNA down to picomolar levels for future applications in telomeric assessment. Pyrene-imidazolium captured in high amounts on the surface of reduced graphene oxide shells allows specific DNA sequence detection by complex formation resulting in release and fluorescence enhancement of pyrene-imidazolium.</P> <P>Graphic Abstract</P><P>Selective complex formation with G-quadruplex forming DNA provides quantifiable fluorescence enhancement of pyrene-imidazolium (<B>PI</B>) upon release from the surface of reduced graphene oxide shells even at picomolar amounts. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cc46744a'> </P>
조성윤,Mohamed Bayome,Justyn Park,임희진,국윤아,한성호 대한치과교정학회 2018 대한치과교정학회지 Vol.48 No.4
Objective: The purpose of this study was to compare the skeletal, dental, and soft-tissue treatment effects of nonextraction therapy using the modified C-palatal plate (MCPP) to those of premolar extraction (PE) treatment in adult patients with Class II malocclusion. Methods: Pretreatment and posttreatment lateral cephalographs of 40 adult patients with Class II malocclusion were retrospectively analyzed. The MCPP group comprised 20 patients treated with total arch distalization of the maxillary arch while the PE group comprised 20 patients treated with four PE. Fifty-eight linear and angular measurements were analyzed to assess the changes before and after treatment. Descriptive statistics, paired t-test, and multivariate analysis of variance were performed to evaluate the treatment effects within and between the two groups. Results: The MCPP group presented 3.4 mm of retraction, 1.0 mm of extrusion, and 7.3o lingual inclination of the maxillary central incisor. In comparison, the PE group displayed greater amount of maxillary central incisor retraction and retroclination, mandibular incisor retraction, and upper lip retraction (5.3 mm, 14.8o, 5.1 mm, and 2.0 mm, respectively; p < 0.001 for all). In addition, the MCPP group showed 4.0 mm of distalization and 1.3 mm of intrusion with 2.9o distal tipping of the maxillary first molars. Conclusions: These findings suggest the MCPP is an effective distalization appliance in the maxillary arch. The amount of incisor retraction, however, was significantly higher in the PE group. Therefore, four PE may be recommended when greater improvement of incisor position and soft-tissue profile is required.[Korean J Orthod 2018;48(4):224-235]
Cho, Youngje,Lee, Ji Ha,Jaworski, Justyn,Park, Sunhong,Lee, Shim Sung,Jung, Jong Hwa The Royal Society of Chemistry 2012 NEW JOURNAL OF CHEMISTRY Vol.36 No.1
<p>Efficient control of aggregation modes of the porphyrin–Pd<SUP>2+</SUP> complexes by ultrasonication and heating is reported. A porphyrin-based metallogel is formed in the presence of Pd<SUP>2+</SUP>, which displays H-type aggregation. Heating the porphyrin derivative in the presence of Pd<SUP>2+</SUP>, however, results in J-type aggregation that does not produce a gel. Conclusive evidence was found that the crystal structure of the related porphyrin–Pd<SUP>2+</SUP> complex obtained by heating shows J-type aggregation.</p> <P>Graphic Abstract</P><P>Aggregation modes of porphyrin–Pd<SUP>2+</SUP> complexes are efficiently controlled by ultrasonication and heating. A porphyrin-based metallogel is formed in the presence of Pd<SUP>2+</SUP> upon ultrasonication, which displays H-type aggregation. <img src='http://pubs.rsc.org/ej/NJ/2011/c1nj20781d/c1nj20781d-ga.gif'> </P>
Jung, Sung Ho,Kim, Ka Young,Lee, Ji Ha,Moon, Cheol Joo,Han, Noh Soo,Park, Su-Jin,Kang, Dongmin,Song, Jae Kyu,Lee, Shim Sung,Choi, Myong Yong,Jaworski, Justyn,Jung, Jong Hwa American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.1
<P>To more accurately assess the pathways of biological systems, a probe is needed that may respond selectively to adenosine triphosphate (ATP) for both in vitro and in vivo detection modes. We have developed a luminescence probe that can provide real-time information on the extent of ATP, ADP, and AMP by virtue of the luminescence and luminescence lifetime observed from a supramolecular polymer based on a C-3 symmetrical terpyridine complex with Tb3+ (S1-Tb). The probe shows remarkable selective luminescence enhancement in the presence of ATP compared to other phosphate-displaying nucleotides including adenosine diphosphate (ADP), adenosine monophosphate (AMP), guanosine triphosphate (GTP), thymidine triphosphate (TTP), H2PO4- (Pi), and pyrophosphate (PPi). In addition, the time-resolved luminescence lifetime and luminescence spectrum of S1-Tb could facilitate the quantitative measurement of the exact amount of ATP and similarly ADP and AMP within living cells. The time-resolved luminescence lifetime of S1-Tb could also be used to quantitatively monitor the amount of ATP, ADP, and AMP in vitro following the enzymatic hydrolysis of ATP. The long luminescence lifetime, which was observed into the millisecond range, makes this S1-Tb-based probe particularly attractive for monitoring biological ATP levels in vivo, because any short lifetime background fluorescence arising from the complex molecular environment may be easily eliminated.</P>