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Intermedins A and B; New Metabolites from Schisandra propinqua var. intermedia
Li, Hong-Mei,Lei, Chun,Luo, Yong-Ming,Li, Xiao-Nian,Li, Xiao-Lei,Pu, Jian-Xin,Zhou, San-Yun,Li, Rong-Tao,Sun, Han-Dong 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.6
A new dibenzocyclooctadiene lignan, intermedin A (1), and a new natural bisabolane sesquiterpenoid, intermedin B (2), were isolated from the aerial parts of Schisandra propinqua var. intermedia. Their structures were elucidated on the basis of extensive spectroscopical analysis.
Intermedins A and B; New Metabolites from Schisandra propinqua var. intermedia
Hong-Mei Li,Chun Lei,Yong-Ming Luo,Xiao-Nian Li,Xiao-Lei Li,Jian-Xin Pu,San-Yun Zhou,Rong-Tao Li,Han-Dong Sun 대한약학회 2008 Archives of Pharmacal Research Vol.31 No.6
A new dibenzocyclooctadiene lignan, intermedin A (1), and a new natural bisabolane sesquiterpenoid, intermedin B (2), were isolated from the aerial parts of Schisandra propinqua var. intermedia. Their structures were elucidated on the basis of extensive spectroscopical analysis.
The Numerical Simulation of Unsteady Flow in a Mixed flow Pump Guide Vane
Li, Yi-Bin,Li, Ren-Nian,Wang, Xiu-Yong Korean Society for Fluid machinery 2013 International journal of fluid machinery and syste Vol.6 No.4
In order to investigate the characteristics of unsteady flow in a mixed flow pump guide vane under the small flow conditions, several indicator points in a mixed flow pump guide vane was set, the three-dimensional unsteady turbulence numerical value of the mixed flow pump which is in the whole flow field will be calculated by means of the large eddy simulation (LES), sub-grid scale model and sliding mesh technology. The experimental results suggest that the large eddy simulation can estimate the positive slope characteristic of head & capacity curve. And the calculation results show that the pressure fluctuation coefficients of the middle section in guide vane inlet will decrease firstly and then increase. In guide vane outlet, the pressure fluctuation coefficients of section will be approximately axially symmetrical distribution. The pressure fluctuation minimum of section in guide vane inlet is above the middle location of the guide vane suction surface, and the pressure fluctuation minimum of section in which located the middle and outlet of guide vane. When it is under the small flow operating condition, the eddy scale of guide vane is larger, and the pressure fluctuation of the channel in guide vane being cyclical fluctuations obviously which leads to the area of eddy expanding to the whole channel from the suction side. The middle of the guide vane suction surface of the minimum amplitude pressure fluctuation to which the vortex core of eddy scale whose direction of fluid's rotation is the same to impeller in the guide vane adhere.
Li Yu-Nian 한국비교정부학회 2005 한국비교정부학보 Vol.9 No.2
Yan Shi Jia Xun (Yan's Family Precepts) of Yan Zhi-tui in Southern and Northern Dynasties (Nanbei Chao, 420-589) is the first family precepts, which contains rich contents and has an organized and grand family system on our history. It lead Confucian thinking into the daily life with the writer's own life experience and Confucian Classics, integrating the achievements from the past. The book focuses on the practices and methods of family education in order to encourage next generations to master the ability of self-protection, learning and survival. As it proposed a practical family education, it became popular among functionary and literati families for thousands of years. It greatly influenced the Chinese feudal society and was delivered to the modern age. Today when we are advocating quality education, we can acquire some beneficial inspiration about family education from Yan Shi Jia Xun, which includes education on value of life, honesty, knowledge of practice and Confucianism. It has been a tendency that we should create a new family education that accords to the demand of modern family and civilization.
Forced Oscillation Theorems for Systems of Neutral Hyperbolic Differential Equations
Wei Nian Li,Fan Wei Meng,Alqin Qi 경북대학교 자연과학대학 수학과 2003 Kyungpook mathematical journal Vol.43 No.3
Sufficient conditions are established for the forced oscillation of systems of neutral hyperbolic differential equations by using a new technique. The main result is illustrated by an example.
Weiwei Li,Min Li,Yantian Chen,Shaoming Zhang,Nian Min Qi 한국생물공학회 2014 Biotechnology and Bioprocess Engineering Vol.19 No.1
Mesenchymal stem cells derived from humanumbilical cords (hUCMSCs) are attractive as a new cellsource for tissue engineering. It is essential to investigateand optimize the seeding process of these cells for thesuccess of cell culture and tissue regeneration in vitro. In thisstudy, a static seeding method (SSM), a centrifugal seedingmethod (CSM), and a novel method-cycling filtrationseeding method (CFSM) are evaluated in terms of seedingefficiency, cell damage, and distribution inside the scaffolds,cell proliferation, and osteogenic differentiation. Cells wereseeded on three-dimensional (3-D) nonwoven PET discs ata density of 1×104 cells/disc, followed by 21 days of cellculture and 20 days of osteogenic differentiation. Cellsgrown in 3-D conditions exhibited higher metabolic activitythan those grown on a 2-D control surface. The CSM andCFSM groups showed higher seeding efficiency, proliferationcapacity, and differentiation potential. H&E staining indicateda more uniform spatial distribution of cells in CFSMgroups. LDH level measurements suggested that more celldamage was caused by the CFSM process. Above all, theresults showed that the cells maintained their proliferationability and differentiation potential ex vivo during approximately7 weeks of culture. The CSM and CFSM arerecommended for hUCMSC tissue engineering, althoughthe seeding parameters still require further investigationand optimization.
Shao Nian Li,Hui Wang,Pan Yang,Yi Li,JunHu Yang 한국유체기계학회 2021 International journal of fluid machinery and syste Vol.14 No.1
This paper sets up both a force balance equation and a three-dimensional geometric model of a flexible side plate in an intra-vane type pump, after analyzing the structure and mechanical properties of the plate. The formulas for calculating deformation were obtained, and the theoretical curve of change in deformation was determined. Then, the contour of deformation was obtained using software simulation. The calculated and simulated values of deformation of the flexible side plate, in three positions under four working pressures, were found to be close to one another, the relative error between them being less than 2%. Next, the formula for the calculation of oil film thickness was obtained, and the curve of the change in oil film thickness relative to the distance along the radial direction of the side plate was determined, considering the flexible side plate deformation. The oil film thickness for three flexible side plate positions were then tested through experiment. The calculated values of oil film thickness were also close to the tested values. Although there was a small difference, the relative error between them was less than 5% for the oil film thickness measured at its lowest point, which indicates the accuracy of the results obtained by the theoretical calculation.
Limonoids from the roots of Trichilia sinensis and their cytotoxicities
Zhu-Nian Wang,Wen-Li Mei,Hui-Qin Chen,Jun Wang,Zhu-Nian Wang,Hao Fu Dai 대한약학회 2018 Archives of Pharmacal Research Vol.41 No.12
Six new compounds (1–4, 8, 10), along with six known limonoids (5–7, 9, 11, 12), were isolated from the roots of Trichilia sinensis. Their structures were elucidated on the basis of extensive spectroscopic methods including 1H NMR, 13C NMR, DEPT, HSQC, HMBC, 1H–1H COSY and ROESY experiments, as well as by comparison with the literature. All the compounds were evaluated for cytotoxicities against K562, SGC-7901 and BEL-7402 cell lines. Compounds 2, 7, 10, 11, and 12 showed weak inhibitory activity to the selected cell lines.
Geng, Chuan-Ying,Liu, Nian,Yang, Guang-Zhong,Liu, Ai-Jun,Leng, Yun,Wang, Hui-Juan,Li, Li-Hong,Wu, Yin,Li, Yan-Chen,Chen, Wen-Ming Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.11
At present, multiple myeloma (MM) remains an incurable disease and cologenic cells may be responsible for disease relapse. It has been proposed that CD20+/CD138- NCI-H929 cells could be hallmarks of MM clonogenic cells. Here, the immunology phenotype of NCI-H929 cells is described. Only a small population of CD20+/CD138- cells (<1%) was found in the NCI-H929 cell line, but CD20+/CD138- cells were not detected. We found that CD20+/CD138+ cells were able to exhibit cologenic capacity by colony formation assay and continuous passage culture. Proteins were analyzed by 1D-SDS-PAGE and TMT based quantitative differential liquid chromatography tandem mass spectrometry (LC-MS/MS). 1,082 non-redundant proteins were identified, 658 of which were differentially expressed with at least a 1.5-fold difference. 205 proteins in CD20+ cells were expressed at higher levels and 453 proteins were at lower levels compared with CD20- cells. Most proteins had catalytic and binding activity and mainly participated in metabolic processes, cell communication and molecular transport. These results proved that there are different biological features and protein expression profile between CD20+ and CD20- cells in the NCI-H929 cell line.