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尹廷洹,趙孝相,金成柱 수원대학교 산업기술연구소 1992 산업기술연구소논문집 Vol.7 No.-
In other to investigate α-1, 3 glucanase from microorganisms for hydrolysis of dental caries, S. muatns was immobilized by cubes of 28% polycrylamide and coated with same polyacrylamide. The insoluble glucan obtained 1.13g per one liter in TH medium with 5% sucrose by PA immobilization of S. muatns, which was very pure by IR and TLC analysis. α-1, 3 glucanase produced by of the Strptomyces SW-522, was developed by treatment with 5% EMS. The new Sw-522 M1 strain obtained, which improved activity of α-1, 3 glucanase.
치면세균막 분해효소인 α-1,3 glucanase를 생산하는 미생물의 분리 및 효소 특성
조효상,허태련,윤정원 한국산업미생물학회 1993 한국미생물·생명공학회지 Vol.21 No.3
S. mutans가 만들어내는 불용성 glucan을 완전히 분해시킬 수 있는 새로운 α-1,3 glucanase를 탐색하기 위하여 S. mutans가 직접 만들어 낸 불용성 glucan을 기질로 사용하여 자연으로부터 미생물을 탐색한 결과, 자연에 존재하는 여러 균주 중 17종의 불용성 glucan 분해능력을 가진 미생물을 분리하였으며 위 균주를 액체배양하여 배양액으로 부터 α-1,3 glucanase를 추출한 결과, 균주 SW-522와 SW-713 균주에서 각각 97.6%와 49.3%의 불용성 glucan을 5시간 후에 분해시키는 효소역가를 보였다. SW-522의 α-1,3 glucanase의 역가는 1.3 ㎎ IG/min·mg protein으로 기존의 발견된 효소보다 십배이상 높았고, SW-522의 α-1,3 glucanase는 S. mutans에 의해 test tube에 형성된 불용성 glucan을 12시간 후에 완전히 분해시켰으며 시판 α-amylase와 기존세치제에 사용되어온 dextranase는 불용성 glucan의 분해도가 각각 10.2%와 6.3%인데 비해 SW-522의 α-1,3 glucanase는 90% 이상의 분해도를 나타냈다. 따라서 새로운 α-1,3 glucanase는 세치제 또는 식품 등에 첨가하여 치아우식예방에 효과가 뛰어난 구강 환경위생용품을 개발할 수 있다고 사료된다. Seventeen strains were isolated from soil, cattle rumen, cereal, sewage dregs, insect on agar plate containing insoluble glucan as a sole carbon source from immobilized Streptococcus mutans, which produced α-1,3 glucanase ofr lysis of dental plaque. Among these strains isolated from soil, SW-522 and SW-713 that had appeared to produce the high level of α-1,3 glucanase, degraded insoluble glucan from S. mutans 97.6% and 49.4%, respectively in 5 hours. The activity of crude α-1,3 glucanase from SW-522 was 1.3 ㎎ insoluble glucan/min·㎎ protein. This enzyme was entirely degraded insoluble glucan on glass tube which produced by S. mutans in TH medium with 5% sucrose.
Red green blue emissive lead sulfide quantum dots: heterogeneous synthesis and applications
Hou, Bo,Cho, Yuljae,Kim, Byung-Sung,Ahn, Docheon,Lee, Sanghyo,Park, Jong Bae,Lee, Young-Woo,Hong, John,Im, Hyunsik,Morris, Stephen M.,Sohn, Jung Inn,Cha, SeungNam,Kim, Jong Min Royal Society of Chemistry 2017 Journal of Materials Chemistry C Vol.5 No.15
<P>Visible emission colloidal quantum dots (QDs) have shown promise in optical and optoelectronic applications. These QDs are typically composed of relatively expensive elements in the form of indium, cadmium, and gallium since alternative candidate materials exhibiting similar properties are yet to be realized. Herein, for the first time, we report red green blue (RGB) photoluminescences with quantum yields of 18% from earth-abundant lead sulfide (PbS) QDs. The visible emissive property is mainly attributed to a high degree of crystallinity even for the extremely small QD sizes (1-3 nm), which is realized by employing a heterogeneous reaction methodology at high growth temperatures (>170 °C). We demonstrate that the proposed heterogeneous synthetic method can be extended to the synthesis of other metal chalcogenide QDs, such as zinc sulfide and zinc selenide, which are promising for future industrial applications. More importantly, benefiting from the enlarged band gaps, the as-prepared PbS solar cells show an impressive open circuit voltage (∼0.8 V) beyond that reported to date.</P>
Hong, John,Hou, Bo,Lim, Jongchul,Pak, Sangyeon,Kim, Byung-Sung,Cho, Yuljae,Lee, Juwon,Lee, Young-Woo,Giraud, Paul,Lee, Sanghyo,Park, Jong Bae,Morris, Stephen M.,Snaith, Henry J.,Sohn, Jung Inn,Cha, Se Royal Society of Chemistry 2016 Journal of materials chemistry. A, Materials for e Vol.4 No.48
<▼1><P>We report a PbS QD hybrid passivation structure to eliminate trap sites while increasing charge extraction in QD solar cells.</P></▼1><▼2><P>Colloidal quantum dots (CQDs) are extremely promising as photovoltaic materials. In particular, the tunability of their electronic band gap and cost effective synthetic procedures allow for the versatile fabrication of solar energy harvesting cells, resulting in optimal device performance. However, one of the main challenges in developing high performance quantum dot solar cells (QDSCs) is the improvement of the photo-generated charge transport and collection, which is mainly hindered by imperfect surface functionalization, such as the presence of surface electronic trap sites and the initial bulky surface ligands. Therefore, for these reasons, finding effective methods to efficiently decorate the surface of the as-prepared CQDs with new short molecular length chemical structures so as to enhance the performance of QDSCs is highly desirable. Here, we suggest employing hybrid halide ions along with the shortest heterocyclic molecule as a robust passivation structure to eliminate surface trap sites while decreasing the charge trapping dynamics and increasing the charge extraction efficiency in CQD active layers. This hybrid ligand treatment shows a better coordination with Pb atoms within the crystal, resulting in low trap sites and a near perfect removal of the pristine initial bulky ligands, thereby achieving better conductivity and film structure. Compared to halide ion-only treated cells, solar cells fabricated through this hybrid passivation method show an increase in the power conversion efficiency from 5.3% for the halide ion-treated cells to 6.8% for the hybrid-treated solar cells.</P></▼2>
High Performance PbS Quantum Dot/Graphene Hybrid Solar Cell with Efficient Charge Extraction
Kim, Byung-Sung,Neo, Darren C. J.,Hou, Bo,Park, Jong Bae,Cho, Yuljae,Zhang, Nanlin,Hong, John,Pak, Sangyeon,Lee, Sanghyo,Sohn, Jung Inn,Assender, Hazel E.,Watt, Andrew A. R.,Cha, SeungNam,Kim, Jong Mi American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.22
<P/><P>Hybrid colloidal quantum dot (CQD) solar cells are fabricated from multilayer stacks of lead sulfide (PbS) CQD and single layer graphene (SG). The inclusion of graphene interlayers is shown to increase power conversion efficiency by 9.18%. It is shown that the inclusion of conductive graphene enhances charge extraction in devices. Photoluminescence shows that graphene quenches emission from the quantum dot suggesting spontaneous charge transfer to graphene. CQD photodetectors exhibit increased photoresponse and improved transport properties. We propose that the CQD/SG hybrid structure is a route to make CQD thin films with improved charge extraction, therefore resulting in improved solar cell efficiency.</P>
Chen, Shanshan,Lee, Sang Myeon,Xu, Jianqiu,Lee, Jungho,Lee, Kyu Cheol,Hou, Tianyu,Yang, Yankang,Jeong, Mingyu,Lee, Byongkyu,Cho, Yongjoon,Jung, Sungwoo,Oh, Jiyeon,Zhang, Zhi-Guo,Zhang, Chunfeng,Xiao, The Royal Society of Chemistry 2018 ENERGY AND ENVIRONMENTAL SCIENCE Vol.11 No.9
<P>To achieve efficient non-fullerene polymer solar cells (NF-PSCs), an in-depth understanding of the key properties that govern the power output is necessary. Herein, three trialkylsilyl substituted benzodithiophene-based polymer donors (PJ1, PJ2, and PJ3) were synthesized with fine-tuning of the highest occupied molecular orbital (HOMO)/lowest unoccupied molecular orbital (LUMO) and optical absorption. Using the polymer series paired with absorption-complementary small molecular acceptors (SMAs), namely, <I>m</I>-ITIC, IDIC, and AIDIC, we systematically studied the performance of a 3 × 3 matrix of NF-PSCs. An increasing open-circuit voltage with deepening HOMOs of the polymer donors, and the enhanced short-circuit current (<I>J</I>SC) and fill factor (FF) were ascribed to the well-intermixed blend morphology containing enhanced SMA order ranges with mixed face-on and edge-on orientations, the so-called 3-D texture. Such an optimal microstructure is best exemplified in the PJ2:IDIC combination, affording a highest efficiency of 12.01% with a simultaneously high <I>J</I>SC of 17.0 mA cm<SUP>−2</SUP> and FF of 75.3%. The devices with an active layer thickness of 300 nm still maintain an impressive efficiency approaching 10% with a decent FF of 60.0%. Moreover, the Channel II process, <I>i.e.</I>, photoinduced hole transfer through acceptor excitation, was demonstrated to be crucially important for photocurrent generation. This study highlights the importance of optimizing the trade-off between charge separation/transport and domain size to achieve high-performance NF-PSCs.</P>
WebCell: a web-based environment for kinetic modeling and dynamic simulation of cellular networks
Lee, Dong-Yup,Yun, Choamun,Cho, Ayoun,Hou, Bo Kyeng,Park, Sunwon,Lee, Sang Yup Oxford University Press 2006 Bioinformatics Vol.22 No.9
<P><B>Summary:</B> WebCell is a web-based environment for managing quantitative and qualitative information on cellular networks and for interactively exploring their steady-state and dynamic behaviors in response to systemic perturbations. It is designed as a user-friendly web interface, allowing users to efficiently construct, visualize, analyze and store reaction network models, thereby facilitating kinetic modeling and <I>in silico</I> simulation of biological systems of interest. A collected model library is also available to provide comprehensive implications for cellular dynamics of the published models.</P><P><B>Availability:</B> WebCell is accessible at http://webcell.kaist.ac.kr or http://webcell.org.</P><P><B>Contact:</B> leesy@kaist.ac.kr</P>