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      • KCI등재

        사계 김장생의 이기론과 심성론 소고

        이학당 ( Li Xue-tang ),왕천천 ( Wang Qian-qian ) 우리한문학회 2017 漢文學報 Vol.37 No.-

        사계 김장생은 조선 중기의 저명한 예학가이고 교육가이다. 그는 스승 율곡의 "기발리승설"과 "리통기국설" 리기론 사상을 계승하면서 리와 기를 혼연일체의 존재로 보았다. 또한 리는 무형무위이고 기는 유형유위라고 보았다. 사계는 퇴계의 이기호발설을 부정한다. 그는 정호의 “기가 도이고 도가 기이다’는 주장을 근거로 이기불상리를 해석한다. 또한 주희의 “리는 리이고 기는 기이다”는 주장을 근거로 이기불상잡을 해석한다. 율곡이 제창한 ‘기발 이승’을 따르면서 리와 기는 “하나이면서 둘이고 둘이면서 하나다.”는 주장을 하면서 리와 기의 조화를 강조한다. 사계는 리와 기가 둘이면서 하나인 관계를 해석할 적에 이기가 합쳐지는 것이 시간적 선후로 구분하는 것은 아니라는 점을 밝힘과 동시에 공간적으로는 기가 리를 포함한다는 입장을 견지한다. 사계는 리는 기 안에 있고 원래 떨어지지 않는다고 하는데 이런 말은 기의 능동성을 중시하는 사계의 입장을 잘 보여주며 그의 심성론과 예악사상의 이론적 기초를 구성한다. 구용에 이해 방식은 사계 사상의 독자성을 보여준다. 사계는 송강이 “구용은 리이다”라고 하는 주장을 두고 체용을 원용하여 구용을 리의 작용으로 설명한다. 따라서 사계는 율곡의 입장에 기반하여 송강의 주장을 반대하지 않는다. 그러나 “형이상자는 기이고 형이하자는 도이다”는 구절에 대한 사계의 해석은 다소 문제가 있다. 사계는 도와 형을 다른 개념으로 이해하고 형과 기를 같은 개념으로 이해하는데 이런 이해는 사실에 부합하지 않는다. 사계는 율곡사상에 기초하여 심, 성, 정, 의, 지 등 성리학 심성론의 기초 개념을 심도 있게 해석한다. 본 연구는 이후 그가 주장하는 사단칠정론과 인심도심설의 이론적 토대가 된다. Shagai Kim jang-saeng was a famous scientist and educator in the middle of the Chosun Dynasty, on Confucianism he basicly inherited Zhu xi and Lee er's overall spirits, in the view of qi he claimedLi is of intangible and inaction, while Qi is of visible and action, so he denied Lee huang’s theory of which Li and Qi are inspired with each other. He cited Cheng hao’s theory of that "Qi is Dao and Dao is Qi" to explain the Li and Qi are not separated, and also quoted zhu xi's theory of that "Li is Li, Qi is Qi" to explain that the Li and Qi are not mixed. He agreed the Lee er’s idea of that"the Qi emits and Li follows " , he advocated "one is two, two is one", emphasizing the harmony of the Li and Qi. In the explanation of the relationship between "two is one", he was not only explained the combination of Li and Qi in chronological order, but also considered that the combination of Li and Qi was "Li was surrounded by Li"in space order. Shagai often said that "Li is in the Qi and they are not dissimilar"which reflected that he emphasised motility of the Qi, and also laid a theoretical foundation for his theory of mindand ritual thought. The understanding of the problem of "nine looks" reflected the autonomy of Shaxi’s thought. He believed that Songgang’s theory of which"nine looks are Li" was the use of Li from the perspective of body and function, so he did not denid Songgang's viewpoint in accordance with Lee er's thought. But he had some problems in the understanding of that "the person who is above, what is the Dao; There are some problems with the understanding of the "Meta physics is the Dao while the opposite is Qi". He seed that the Xing and Dao are different concept, but he thought that Xing and Qi are the same concept, which was lack of science. In terms of theory of mind, he based on the Yulgok’s thoughts, he made the detailed explanation for the basic concepts of neo-confucianism, such as the heart, character, feeling, idea, aspiration, whichbecame the necessary theoretical matting of the theory of four sides and seven feelings and the theory of people’s mind and Dao’s mind for the next step.

      • KCI등재

        White-Matter Hyperintensities and Lacunar Infarcts Are Associated with an Increased Risk of Alzheimer’s Disease in the Elderly in China

        Shuai Ye,Shuyang Dong,Jun Tan,Le Chen,Hai Yang,Yang Chen,Zeyan Peng,Yingchao Huo,Juan Liu,Mingshan Tang,Yafei Li,Huadong Zhou,Yong Tao 대한신경과학회 2019 Journal of Clinical Neurology Vol.15 No.1

        Background and Purpose This study investigated the contribution of white-matter hyperintensities (WMH) and lacunar infarcts (LI) to the risk of Alzheimer’s disease (AD) in an elderly cohort in China. Methods Older adults who were initially cognitively normal were examined with MRI at baseline, and followed for 5 years. WMH were classified as mild, moderate, or severe, and LI were classified into a few LI (1 to 3) or many LI (≥4). Cognitive function was assessed using the Mini Mental State Examination and the Activities of Daily Living scale. Results Among the 2,626 subjects, 357 developed AD by the end of the 5-year follow-up period. After adjusting for age and other potential confounders, having only WMH, having only LI, and having both WMH and LI were associated with an increased risk of developing AD compared with having neither WMH nor LI. Moderate and severe WMH were associated with an increased risk of developing AD compared with no WMH. Furthermore, patients with many LI had an increased risk of developing AD compared with no LI. Conclusions Having moderate or severe WMH and many LI were associated with an increased risk of developing AD, with this being particularly striking when both WMH and LI were present.

      • KCI등재

        이덕무(李德懋)의 명대문학(明代文學) 비평에 대한 일고찰

        이학당 ( Xue Tang Li ),위홍 ( Hong Wei ) 한국실학학회 2011 한국실학연구 Vol.0 No.21

        본고에서는 이덕무의 명대문학 비평 중에서 의고파와 공안파의 대표 작가들에 대한 비평을 위주로 검토를 하였다. 조선후기 저명한 문학비평가인 이덕무는 명대 문단에 대해서 깊이 있게 파악하고 있었다. 그는 우선 명대 문단에서 가장 큰 영향력을 발휘했던 의고파의 대표 인물들에 대해서 많은 기술을 하였다. 그가 남긴 명대 문학비평 자료에서 가장 많이 언급된 인물은 바로 이반룡과 왕세정이다. 그들의 시(詩), 문(文)뿐만 아니라 의고파의 문학이론에 대해서도 깊이 있는 비평을 가하였다. 둘째는 공안파의 대표인물인 원굉도에 대한 중점적인 검토이다. 원굉도의 시와 문에 대하여 흥미있게 감상하고 인용했으며 공안파가 제창한 ``독서성령(獨抒性靈)``의 문학주장에 대해서도 의고파와 견주면서 논평하기도 하였다. 이덕무는 청나라 당대의 문단보다는 오히려 명대의 문단에 대하여 더 많은 관심을 갖고 주목하여 다양한 논술과 비평 내용을 남겼다. 이덕무는 왜 명대 문인들과 그들의 문학을 이렇듯 중요시하였는가. 그 이유는 다음과 같은 세 가지 측면에서 분석할 수 있다. 첫째, 이덕무의 정통 사상과 의리 정신에서 찾을 수 있다. 그는 연암을 대표로 하는 북학파의 일원으로서 북학사상을 공유한 것이 사실이다. 그러나 이덕무는 연암과 마찬가지로 내심에는 아직 명대가 한족이 통치하는 정통국가이고 청나라는 이방인이 잠시 중국을 장악하는 이민족 국가에 불과하다는 생각을 가지고 있었다. 둘째, 이덕무는 중국의 문학 발전에 있어, 명대 문학 자체의 특성에 주목하여, 이 시기의 문학에 대하여 특별한 관심을 가지게 됐다고 생각한다. 셋째, 명대의 많은 문학이론과 그 성과들이 이덕무 본인의 심미(審美)취향, 창작 실천과 맞아떨어졌다고 할 수 있다. 물론 문학론에 있어서 전후 칠자와 공안파는 서로 대립적인 것이다. 그렇지만 각자의 문학론은 꼭 누가 옳고 누가 그르다고 할 수 없을 것이다. 이덕무의 전후칠자 및 공안파의 주장에 대한 평가도 공정하고 객관적이다. 개인적인 취향에 있어서 이 두 부류의 주장과 겹치는 면이 적지 않아, 그들 주장의 심층적인 면에 대해서 더욱 연구해보려는 의도가 있었다고 본다. Lee Demoo(1741~1793)is a famous scholar in the late Joseon Dynasty. As a literary critic, most of Chinese scholars and works he mentioned is about Ming Dynasty, which shows his great attention on the literary world of Ming Dynasty. Some relevant discussion and critical content can be looked as precious data for researching on his literary thought. In the literary world of Ming Dynasty, all kind of new literary current took shape by carrying on previous work, such as classicist school who advocated learning from ancients by QianHouQiZi, anti-classicist School who advocated innovation by Gong an School, Tang-Song School and Jing Ling School. Also the artistic expression means are more rich and varied, and prose, poem and drama competed with each other for beauty. The reasons he pays attention to the literary world of Ming Dynasty focused on three aspects-traditional ideology and argumentation, characteristics of the literary world, the inosculation of his aethestic standard and creation practice to the theory and literature achievements in Ming Dynasty. Lee Demoo thinks highly of the literary theory and achievements in literary world of Ming Dynasty. There are two features of his criticism on literature of that period. First of all, the style of his criticism developed from subjectivity to objectivity, from what we can realize the process of his increased knowledge and experience in literature of Ming Dynasty. Secondly, he made some key criticism by classifying on works or viewpoints of representative figures, such as Lee Panlong and Wang Shizhen in QianHouQiZi School, Yuan Hongdao in Gong an School, Zhong Xing in JingLing School and Critic, Jing Shengtan. The content of his criticism on literature of Ming Dynasty focused on three aspects. The first one is criticism on writer. For example, he summarized some writers` biography and clarified their poems viewpoints and achievements in Mini Biography of Poems Observed, such as Liu Ji, Song Lian, Gao Bing, Li Dongyang in the early of dynasty, Li Mengyang, He Jingming and Li Panlong in the middle period, Gu Yanwu and Zhu Yizun in transitional period. Second, criticism on various kinds of schools. The main issue of fact in literature of Ming Dynasty is about the classicist and anti-classicist. He gave highly appreciate to the vigorous and hsingling literature of the classicist school, while pointing out the disadvantages because of persistent on their own concept. The third is criticism on novels. He did some specific analysis on Zhong Xing`s comment about Water Margin and Jin Shengtan`s novel notion when he wrote his SuiJingXiTan. He did a certain textual research on Shi Naian`s novel from the standpoint of social origin theory, and approved its artistic quality. However, he proposed the useless and harmful theory of novel when he compared novel to the other literary forms, which showed his limitation on literary concept.

      • KCI등재

        Membrane technologies for Li+/Mg2+ separation from salt-lake brines and seawater: A comprehensive review

        Ye Zhang,Li Wang,Wei Sun,Yue-hua Hu,Honghu Tang 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.81 No.-

        Recent years have seen rapid improvement of technology and large-scale applications of lithium-ionbatteries, which leads to an increasing market demand for lithium. Since the land lithium resources arediminishing drastically, the sources of lithium extraction have shifted to the large amount of waterresources containing salt-lake brines and seawater. Among the varieties of aqueous recovery approaches,membrane technology seems to have huge development potential and good application prospect. This isbecause the membrane technologies exhibit excellent Li/Mg separation selectivity, with low energyconsumption and green process owing to no addition of chemicals. The present work reviews the latestadvances in various membrane technologies, including nanofiltration membrane, electrodialysis,membrane capacitive deionization approaches, solid electrolyte electrolysis-based technology, etc. Therecent developments in positively charged nanofiltration membrane are discussed in terms of thepreparation methods, membrane properties, and Li/Mg separation coefficient. In addition, the effects ofseveral factors on electrodialysis for lithium extraction and relevant mechanisms in both simple andactual saline systems are discussed, including applied voltage, VC/VD, and coexisting ions. Theapplications of electrodialysis with novel selective membrane involving nanofiltration membrane as wellas solid electrolyte membrane and perspectives for further investigation are proposed.

      • KCI등재

        Optimized Assembly of Micro-/Meso-/Macroporous Carbon for Li–S Batteries

        Qiong Tang,Heqin Li,Min Zuo,Jing Zhang,Yiqin Huang,Peiwen Bai,Jiaqi Xu,Kuan Zhou 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.2

        In order to explore the effect of hierarchical porous carbon on the performances of Li–S batteries, we synthesized three kinds of micro-/meso-/macroporous carbon materials with different pore properties by facile hard-template method. Different from the majority of reports on porous carbon ensuing large specific surface area (SSA) and total pore volume, it was found that in the case of identically high sulfur content, the pore size distribution substantially influences the performances of Li–S batteries rather than the SSA and total pore volume. Furthermore, in the assembly of micro-/meso-/macropores, the micropore volume ratio to the total pore volume is dominant to the capabilities of batteries. Among the samples, the porous carbon carbonized with the precursor of sucrose at 950℃ presents the highest initial discharge specific capacity of 1327 mAh/g and retention of 630 mAh/g over 100 cycles at 0.2C rate along with the best rate capability. This sample possesses the largest micropore volume ratio of 47.54% but a medium SSA of 1217 m2 /g and inferior total pore volume of 0.54 cm3 /g. The abundant micropores effectively improve the conductivity of dispersed sulfur particles, inhibit the loss of sulfur series and enable the cathode to exhibit superior electrochemical performances.

      • KCI등재

        Enhanced ionic conductivity of composite solid electrolyte by directionally ordered structures of linear Li1.3Al0.3Ti1.7(PO4)3

        You Li,Mulan Tang,Shuxin Xu,Shuchao Zhang,Yuxin Zhai,Jiarong Yin,Zhengguang Zou 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-

        The NASICON-type solid electrolyte structure of Li1.3Al0.3Ti1.7(PO4)3 (LATP) exhibits good electrochemicalperformance and thermal stability, and has been promising as a solid electrolyte. Here, a stable goodstabilityLATP precursor spinning solution was prepared using the sol–gel method for the first time. A linearLATP solid electrolyte with an oriented ordered structure was obtained using improved electrostaticspinning equipment. The sintering process regime of the LATP-ordered construction was determined. Theionic conductivity of the prepared LATP-PEO/LiClO4-PEG composite solid-state electrolyte with anordered structure was as high as 2.05 10-4 Scm1 at room temperature (25 C), one order of magnitudehigher than the ionic conductivity of the LATP composite solid-state electrolyte reported so far. Organicsolid-state electrolytes to protect LATP-ordered structured solid-state electrolytes yield excellent electrochemicalstability in lithium-metal batteries.

      • KCI등재

        Current state of research about acupuncture for the treatment of COVID-19: A scoping review

        Chen Chen,Jie Zhan,Hao Wen,Xiaojing Wei,Lu Ding,Chenyang Tao,Cui Li,Peiming Zhang,Yuyuan Tang,Jing-chun Zeng,Li-ming Lu 한국한의학연구원 2021 Integrative Medicine Research Vol.10 No.-

        Background Since the outbreak of coronavirus disease (COVID-19), acupuncture has been widely used in the treatment of COVID-19. The research community has responded rapidly and has already published many research articles about this topic. Methods We searched PubMed, Embase, Cochrane Library as well as CNKI, Wanfang and VIP from January 1, 2020 to July 31, 2021. The dates of publication, language of publication, methodological characteristics and the key findings were analyzed separately. The data are presented as bar graphs, structured tables and figures. Results In this scoping review, 16 research articles were included: 7 case reports, 6 observational studies, 1 review, 1 RCT and 1 nonrandomized clinical trial. The majority of the articles (81.3%) were published by Chinese scholars, 12.5% articles were by scholars in the United States, and 6.3% articles were by scholars in Iran. The included studies reported that acupuncture could alleviate the symptoms of COVID-19 patients, shorten their hospitalization days, and is effective for the elderly. There were no side effects reported. The most frequent acupoints used were LI4, PC6, ST36 and KI3. They reported many obstacles in implementing acupuncture therapy for treating COVID-19 patients. Conclusion Acupuncture has a good effect for the treatment of COVID-19, but high-quality evidence support is still lacking. Coupled with the difficulties that acupuncturists experienced during the process of treatment, the promotion of acupuncture treatment for COVID-19 faces many obstacles. Background Since the outbreak of coronavirus disease (COVID-19), acupuncture has been widely used in the treatment of COVID-19. The research community has responded rapidly and has already published many research articles about this topic. Methods We searched PubMed, Embase, Cochrane Library as well as CNKI, Wanfang and VIP from January 1, 2020 to July 31, 2021. The dates of publication, language of publication, methodological characteristics and the key findings were analyzed separately. The data are presented as bar graphs, structured tables and figures. Results In this scoping review, 16 research articles were included: 7 case reports, 6 observational studies, 1 review, 1 RCT and 1 nonrandomized clinical trial. The majority of the articles (81.3%) were published by Chinese scholars, 12.5% articles were by scholars in the United States, and 6.3% articles were by scholars in Iran. The included studies reported that acupuncture could alleviate the symptoms of COVID-19 patients, shorten their hospitalization days, and is effective for the elderly. There were no side effects reported. The most frequent acupoints used were LI4, PC6, ST36 and KI3. They reported many obstacles in implementing acupuncture therapy for treating COVID-19 patients. Conclusion Acupuncture has a good effect for the treatment of COVID-19, but high-quality evidence support is still lacking. Coupled with the difficulties that acupuncturists experienced during the process of treatment, the promotion of acupuncture treatment for COVID-19 faces many obstacles.

      • SCISCIESCOPUS

        Metabolic Regulation of Gene Expression by Histone Lysine β-Hydroxybutyrylation

        Xie, Zhongyu,Zhang, Di,Chung, Dongjun,Tang, Zhanyun,Huang, He,Dai, Lunzhi,Qi, Shankang,Li, Jingya,Colak, Gozde,Chen, Yue,Xia, Chunmei,Peng, Chao,Ruan, Haibin,Kirkey, Matt,Wang, Danli,Jensen, Lindy M. Elsevier 2016 Molecular cell Vol.62 No.2

        <P><B>Summary</B></P> <P>Here we report the identification and verification of a β-hydroxybutyrate-derived protein modification, lysine β-hydroxybutyrylation (Kbhb), as a new type of histone mark. Histone Kbhb marks are dramatically induced in response to elevated β-hydroxybutyrate levels in cultured cells and in livers from mice subjected to prolonged fasting or streptozotocin-induced diabetic ketoacidosis. In total, we identified 44 histone Kbhb sites, a figure comparable to the known number of histone acetylation sites. By ChIP-seq and RNA-seq analysis, we demonstrate that histone Kbhb is a mark enriched in active gene promoters and that the increased H3K9bhb levels that occur during starvation are associated with genes upregulated in starvation-responsive metabolic pathways. Histone β-hydroxybutyrylation thus represents a new epigenetic regulatory mark that couples metabolism to gene expression, offering a new avenue to study chromatin regulation and diverse functions of β-hydroxybutyrate in the context of important human pathophysiological states, including diabetes, epilepsy, and neoplasia.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Lysine β-hydroxybutyrylation (Kbhb) is a new type of histone mark </LI> <LI> 44 non-redundant histone Kbhb sites are identified in human and mouse cells </LI> <LI> Histone Kbhb increases under starvation and STZ-induced ketoacidosis </LI> <LI> Starvation-induced H3K9bhb is associated with active gene expression </LI> </UL> </P> <P><B>Graphical Abstract</B></P> <P>[DISPLAY OMISSION]</P>

      • Late Paleoproterozoic ultrahigh-temperature metamorphism in the Korean Peninsula

        Santosh, M.,Hu, Chao-Nan,Kim, Sung Won,Tang, Li,Kee, Weon-Seo Elsevier 2018 Precambrian Research Vol.308 No.-

        <P><B>Abstract</B></P> <P>The Paleoproterozoic rock record from the Sino-Korean Peninsula was fundamental to the models on evolution of the Asian continental collage and its relationship with the amalgamation and disruption of Proterozoic supercontinents such as Columbia and Rodinia. In this study, we present results from a comprehensive investigation on the khondalites in the Hongseong area, along the western part of the Gyeonggi massif within the central Korean Peninsula involving petrography, phase equilibria forward modeling, and zircon U-Pb geochronology, REE geochemistry and Lu – Hf isotopes. The <I>P-T</I> pseudosections show that the peak mineral assemblage of garnet + sillimanite + quartz + plagioclase + K-feldspar + ilmenite in the khondalite is stable at 7.5–9.6 kbar and 895–990 °C, corresponding to ultra-high temperature (UHT) metamorphism. We also report the first finding of corundum and quartz inclusions within sillimanite enclosed in garnet porphyroblast further confirming UHT metamorphism. The interpreted <I>P-T</I> path involves decompression and exhumation along a clockwise trajectory as suggested by the retrograde textures and mineral phase equilibria modeling.</P> <P>The detrital zircon U – Pb data from the khondalite show multiple age peaks for the magmatic population suggesting Neoarchean – Paleoproterozoic provenance. Metamorphic zircons from the khondalites yield ages of 1931 ± 33 Ma, 1871 ± 11 Ma and 1866 ± 10 Ma. The spot ages range from 1923 Ma to 1832 Ma suggesting either a long-lived metamorphic event or two distinct thermal events. The REE patterns of the zircon grains also clearly distinguish the magmatic and metamorphic populations. The garnet + sillimanite assemblage is considered to represent the peak UHT assemblage and the cordierite + biotite represents the post-peak retrograde assemblage. The ca. 1923–1832 Ma ages obtained in our study from metamorphic zircon domains correlate well with similar ages reported for metamorphism associated with the amalgamation of crustal blocks within the North China Craton. Our study suggests that the Late Paleoproterozoic UHT metamorphism in the central Korean Peninsula might be part of a common event within the Sino-Korean Craton related to the tectonics of final assembly of cratonic blocks within the Columbia supercontinent. Although a substantial volume of the Paleoproterozoic basement of the Korean Peninsula was destroyed and recycled during the Neoproterozoic and Phanerozoic tectonic events, the preserved remnants provide insights into the contiguity of the basements of the Korean Peninsula and the North China Craton.</P> <P><B>Highlights</B></P> <P> <UL> <LI> First precise documentation of ultrahigh-temperature metamorphism in Central Korean Peninsula. </LI> <LI> Discovery of corundum + quartz assemblage testifying to extreme thermal conditions. </LI> <LI> Metamorphic zircon grains define ages ranging from 1923 to 1823 Ma. </LI> <LI> Correlation with the North China Craton within the Sino-Korean continental collage. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

      • SCOPUSKCI등재

        Monosaccharide as a Central Scaffold Toward the Construction of Salicylate-Based Bidentate PTP1B Inhibitors via Click Chemistry

        Tang, Yan-Hui,Hu, Min,He, Xiao-Peng,Fahnbulleh, Sando,Li, Cui,Gao, Li-Xin,Sheng, Li,Tang, Yun,Li, Jia,Chen, Guo-Rong Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.3

        The discovery of carbohydrate-based bioactive compounds has recently received considerable interest in the drug development. This paper stresses on the application of 1-methoxy-O-glucoside as the central scaffold, whereas salicylic pharmacophores were introduced with diverse spatial orientations probing into the structural preference of an enzymatic target, i.e. protein tyrosine phosphatase 1B (PTP1B). By employing regioselective protection and deprotection strategy, 2,6-, 3,4-, 4,6- and 2,3-di-O-propynyl 1-methoxy-O-glucosides were previously synthesized and then coupled with azido salicylate via click chemistry in forming the desired bidentate salicylic glucosides with high yields. The inhibitory assay of the obtained triazolyl derivatives leads to the identification of the 2,3-disubstituted salicylic 1-methoxy-O-glucoside as the structurally privileged PTP1B inhibitor among this bidentate compound series with micromole-ranged $IC_{50}$ value and reasonable selectivity over other homologous PTPs tested. In addition, docking simulation was conducted to propose a plausible binding mode of this authorized inhibitor with PTP1B. This research might furnish new insight toward the construction of structurally different bioactive compounds based on the monosaccharide scaffold.

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