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- 저자 : Arisu, Hacer Deniz (검색결과 4 건)
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Ultralow fouling of fibrinogen and human platelets on ulvan multilayer-coated solid surfaces
Arisu Lee,Sung Min Kang 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
Enhancement of blood compatibility with the implant surface is critical for biomedical devices. Coatingsolid surfaces with an anticoagulant is a potentially promising strategy to improve blood compatibilitywith the implant surface. This study aimed to develop an approach to enhance blood compatibility withtitanium/titanium dioxide (Ti/TiO2) surfaces using a green seaweed-derived polysaccharide ulvan. Theapproach comprises surface coating with tannic acid (TA) and grafting of ulvan onto the surface. Zirconium(IV)-based coordination linkage between ulvan and TA facilitated robust deposition of ulvanmultilayers onto Ti/TiO2 surfaces. Adhesion assays revealed that more than 95% offibrinogen adsorptionand platelet adhesion was suppressed through an ulvan multilayer coating. The present results show thatulvan multilayers are robust against chemical and physical treatments and resistant to the adsorption ofadherent proteins and human platelets.
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The effect of different adhesive system applications on push-out bond strengths of glass fiber posts
Kivanc, Bagdagul Helvacioglu,Arisu, Hacer Deniz,Uctasli, Mine Betul,Okay, Tufan Can The Korean Academy of Prosthodonitics 2013 The Journal of Advanced Prosthodontics Vol.5 No.3
PURPOSE. Over the past years, the adhesion of fiber posts luted with simplified adhesive systems has been a matter of great interest. The aim of this study was to assess the post retentive potential of a self-adhesive resin cement using different adhesive systems to compare the push-out bond strengths of fiber posts. MATERIALS AND METHODS. The post spaces of 56 mandibular premolar roots were prepared and divided into 4 experimental groups and further divided into 2 subgroups according to testing time (n=7). The fiber posts (Rely X Fiber Post) were luted with a self-adhesive resin cement (RelyX Unicem) and one of the following adhesive systems: no adhesive, a total-etch adhesive resin (Single Bond), a two-step self-etch adhesive resin (Clearfil SE Bond) and a one-step self-etch adhesive resin (Clearfil S3 Bond). Each root was cut horizontally, and 1.5 mm thick six root segments were prepared. Push-out tests were performed after one week or three months (0.5 mm/min). Statistical analysis were performed with three-way ANOVA (${\alpha}$=.05). RESULTS. Cervical root segments showed higher bond strength values than middle segments. Adhesive application increased the bond strength. For one week group, the total-etch adhesive resin Single Bond showed higher bond strength than the self-adhesive resin cement RelyX Unicem applied without adhesive resin at middle region. For 3 months group, the two-step self-etch adhesive resin Clearfil SE Bond showed the highest bond strength for both regions. Regarding the time considered, Clearfil SE Bond 3 months group showed higher bond strength values than one week group. CONCLUSION. Using the adhesive resins in combination with the self-adhesive resin cement improves the bond strengths. The bond strength values of two-step self-etch adhesive resin Clearfil SE Bond improved as time passes.
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Synergistic effect of Cu and Ru decoration on g-C3N4 for electrocatalytic CO2 reduction
Chechia Hu,Miao-Ting Liu,Arisu Sakai,Masaaki Yoshida,Kun-Yi Andrew Lin,Chun-Chieh Huang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.115 No.-
Electrocatalytic CO2 reduction is an emerging approach for the reduction of CO2 in a feasible, green, andeffective manner. In this study, bimetallic compounds of Cu and Ru were both decorated onto ap-conjugated g-C3N4 surface (CuxRuyCN), which functioned as an electrode for electrochemical CO2reduction. From the X-ray photoelectron and X-ray absorption spectra, Cu and Ru on CuxRuyCN wereidentified as the oxidative states of CuO/Cu2O and RuO2, respectively. The mixed states of CuO andCu2O served as active sites to both adsorb and activate CO2 for effective reduction, while RuO2synergistically served as the hole-enrichment center and transferred H protons to promote CO2 reduction. Consequently, the electrochemical current density of CuxRuyCN was significantly enhanced comparedwith the corresponding densities of CN or Cu-doped CN. The current density of CuxRuyCN reduced to lessthan 0.05 mA cm2 at an applied voltage of 1.5 V in an air or Ar atmosphere, indicating that the highcurrent density of CuxRuyCN was associated with the flow of CO2 and its reduction. Moreover, the currentdensity of CuxRuyCN was maintained at approximately 0.3 mA cm2 for at least 2000 s at an appliedvoltage of 1.4 V (vs Ag/AgCl), indicating its high stability during CO2 reduction. In summary, both Cuand Ru-modified g-C3N4 samples used to produce CuO/Cu2O- and RuO2-decorated g-C3N4 acted as effectivecatalysts for electrocatalytic CO2 reduction and demonstrated several potential electrochemicalapplications.
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( Masaru Murata ),( Toshiyuki Akazawa ),( Junichi Hino ),( Junichi Tazaki ),( Katsutoshi Ito ),( Makoto Arisue ),( Maxillofacial Surgery ) 조선대학교 치의학연구원 2011 Oral Biology Research (Oral Biol Res) Vol.35 No.1
The aim of this study was to evaluate the hard tissue-inductive capability by human decalcified dentin matrix (DDM) with or without recombinant human bone morphogenetic protein-2 (BMP-2). Human teeth were crushed, completely decalcified and freeze-dried. We named the material DDM. The shape of DDM was a particle type and its size varied from 0.4 to 0.8 mm. The hard tissue induction by 70 mg of DDM was estimated histologically in the nude mice subcutaneous tissue at 4 weeks after implantation. The DDM alone induced bone and cartilage, independently, in the back skin. In addition, the time-course of bone induction by BMP-2 (5.0 μg)/DDM (70 mg) was analyzed in the rat subcutaneous tissues. Histological findings showed that the BMP-2/DDM induced bone and marrow between the DDM particles. Calcium content in the BMP-2/DDMinduced tissue was compatible to the histological findings. The morphometric analysis demonstrated that the BMP-2/DDM showed 66.9%, 79.0% in the volume of bone and marrow, and 32.4%, 21.0% in that of DDM at 8, 32 weeks, respectively. These results indicate that human DDM particles are osteo-chondroinductive and absorbable matrics. Human DDM are effective biomaterials of BMP-2 delivering for bone engineering.
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