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조직학과 효소활성 방법을 이용한 순 타이타늄과 타이타늄 합금의 상대적인 생체적합성 평가
염동선(Dong Sun Yeom),김병일(Byung Il Kim),이유미(Yu Mi Lee),이은정(Eun Jung Lee),이성태(Sung Tae Yee),성치남(Chi Nam Seong),서권일(Kwon Il Seo),조현욱(Hyun Wook Cho) 한국독성학회 2007 Toxicological Research Vol.23 No.2
Titanium or titanium alloy is a widely used implant material according to its certified biocompatibility, sufficient strength and ready availability. The purpose of this study was to evaluate the relative biocompatibility of titanium and titanium alloy specimens (Ti-29Nb-13Ta, TiNb and Ti-6Al-4V, Ti64) using in vivo and in vitro methods. For in vivo experiment, the specimens were implanted in the abdominal subcutaneous region of female mice for 2 and 4 weeks. The reaction of connective tissue to specimens was evaluated histologically. The specimens were encapsulated by fibrous connective tissue consisting of fibroblast, fibrocyte and other cells including neutrophil, macrophage, giant multinucleated cell and unidentified cells. Some newly formed blood vessels were located in the fibrous capsule surrounding the implant. Cell types and the thickness of fibrous capsules were examined quantitatively. Most of cell types located in the fibrous capsule were fibroblasts and fibrocytes. The average thickness of fibrous capsules for the TiNb specimens was much thinner than that of the titanium alloy, Ti64. The thickness of the fibrous capsule around all titanium specimens decreased at 4 weeks compared to 2 weeks post-implantation. The biocompatibility of titanium and titanium alloy specimens were also investigated in in vitro method using alkaline phosphatase from MG-63 cells. Alkaline phosphatase activity of the TiNb specimen showed higher activity than the titanium alloy, Ti64. In conclusion, the TiNb alloy with thin capsule thickness in vivo and high alkaline phosphatase activity in vitro will be of considerable use in biomedical applications.
Yeom, Hye-Jung,Lee, Eun-Hye,Ha, Mi-Sun,Ha, Sang-Do,Bae, Dong-Ho The Korean Society for Applied Biological Chemistr 2010 Applied Biological Chemistry (Appl Biol Chem) Vol.53 No.1
The objectives of this study were to increase the protein purity in the rice protein isolate, and to enhance the functional properties of the extracted rice bran protein via enzymatic hydrolysis and/or high temperature treatment. Washing the isolates with 30% ethanol solution achieved significant improvements in the protein contents (77.62%) of the rice bran protein isolates. The highest improvement in solubility was detected in the isolate autoclaved after enzymatic hydrolysis, up to 97.4% at a pH of 10.0. A combined modification of the method involving autoclaving and protease-hydrolysis improved the emulsion activity of the isolate at pH values above 6.0. The autoclaving and enzymatic hydrolysis increased the foaming capacity of the isolate, but reduced the foam stability at all pH ranges except 5.0. Enzymatically hydrolyzed isolates evidenced lower minimum concentrations of gel formation proteins and higher gel strengths than were detected in the other isolates.
Sun, Yan-Lin,Wang, Dong,Yeom, Myung-Hun,Kim, Duck-Hee,Kim, Han-Gon,Hong, Soon-Kwan The Korean Society of Plant Biotechnology 2011 식물생명공학회지 Vol.38 No.4
The medicinal herb Oldenlandia diffusa is known as a folk medicine for the treatment of hepatitis, sore throat, appendicitis, malignant tumors and urethral infection in Southern China and Korea. Another species O. corymbosa, is also used for the therapy of the similar conditions, however, only O. diffusa is referred to the medicinal herb by Chinese Pharmacopoeia. Due to their similar morphology, O. diffusa and O. corymbosa are often misidentified. To easily identify O. diffusa from O. corymbosa, the phylogenetic utility of nuclear ribosomal DNA (nrDNA) internal transcribed spacers (ITS) were investigated among different O. diffusa and O. corymbosa populations in Korea. The nrDNA ITS sequence of O. diffusa contained 791 bp, with GenBank accession number of JF837601-JF837602. The nrDNA ITS sequence of O. corymbosa was 785-786 bp, with GenBank accession number of JF837603-JF837611. The results showed that there are some certain divergences in the ITS region sequence between both species, even among different populations of the same species. Particularly, O. corymbosa ST-4 population showed the highest dissimilarity of the ITS region sequence with other nine populations of O. corymbosa and two populations of O. diffusa. This consequence makes us further understand the molecular diversification between O. corymbosa and O. diffusa, and help to promote the correct use and safety.
Polyselenide Anchoring Using Transition-Metal Disulfides for Enhanced Lithium–Selenium Batteries
Choi, Dong Shin,Yeom, Min Sun,Kim, Yong-Tae,Kim, Heejin,Jung, Yousung American Chemical Society 2018 Inorganic Chemistry Vol.57 No.4
<P>While selenium has recently been proposed as a lithium battery cathode as a promising alternative to a lithium–sulfur battery, dissolution of intermediate species should be resolved to improve its cycle stability. Here, we report the promising results of transition-metal disulfides as an anchoring material and the underlying origin for preventing active material loss from the electrode using density functional theory calculations. Group 5 and 4 disulfides (VS<SUB>2</SUB>, NbS<SUB>2</SUB>, TaS<SUB>2</SUB>, TiS<SUB>2</SUB>, ZrS<SUB>2</SUB>, and HfS<SUB>2</SUB>) in particular show anchoring capabilities superior to those of group 6 disulfides (CrS<SUB>2</SUB>, MoS<SUB>2</SUB>, and WS<SUB>2</SUB>). The governing interaction controlling the latter relative anchoring strengths is shown to be charge transfer as understood by crystal-field theory. The current findings and methodologies provide novel chemical insight for the further design of inorganic anchoring materials for both lithium–selenium and lithium–sulfur batteries.</P><P>The anchoring process of lithium polyselenides on transition-metal sulfides that depends on the group of metal elements is strongly correlated to charge transfer as understood by crystal-field theory.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/inocaj/2018/inocaj.2018.57.issue-4/acs.inorgchem.7b03001/production/images/medium/ic-2017-030019_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ic7b03001'>ACS Electronic Supporting Info</A></P>
Choi, Sun Young,Cho, Dae Kun,Song, Yong-Won,Oh, Kyunghwan,Kim, Kihong,Rotermund, Fabian,Yeom, Dong-Il Optical Society of America 2012 Optics express Vol.20 No.5
<P>We demonstrate a novel in-line saturable absorber based on hollow optical fiber (HOF) filled with graphene composite for high power operation of mode-locked fiber laser. Evanescent field of guided mode propagating in few centimeter-long HOF interacts with the graphene/polyvinyl acetate (PVAc) composite, which enables robust and efficient nonlinear absorption leading to stable passive mode-locking. The mode-locked fiber laser generates soliton pulses with 5.9-nm spectral bandwidth and its maximum output power is measured up to 80 mW. We also observe passive harmonic mode-locking of soliton laser delivering stable pulses with a repetition rate of 506.9 MHz at 33rd harmonics. (c) 2012 Optical Society of America</P>