http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
ROOM-TEMPERATURE FERROMAGNETISM IN SnO 2 NANOFIBERS AND NANOTUBES PREPARED BY ELECTROSPINNING
JIAN-GUO ZHAO,WEI-YING ZHANG,ZHAO-JUN LIU,ZHONG-LI LIU,YA-JUAN ZHANG,ER-QING XIE,XIU-YUN AN,YONG-FENG CHEN,CHANG-YOU ZHANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.2
SnO 2 nano¯bers and nanotubes were synthesized by electrospinning method. Magnetizationmeasurement indicates that the SnO 2 nano¯bers and nanotubes annealed in air at 500?C exhibitthe room-temperature ferromagnetism and the ferromagnetism of nanotubes is stronger than thenano¯bers. Selected area electron di®raction, X-ray di®raction and Raman measurements showthat all the samples possess a typical rutile structure and no other impurity phases are observed. The results of the Raman spectra also indicate that there are lots of defects existing in thefabricated samples. The observed room-temperature ferromagnetism in SnO 2 nano¯bers andnanotubes possibly originates from oxygen vacancies. The ¯eld cooled (FC) and zero-¯eld-cooled(ZFC) magnetization curves indicate that the Curie temperature T C is above 300 K.
Jian Sun,Dong-Wei Xie,Hong-Wei Zhao,De-Tang Zou 한국유전학회 2013 Genes & Genomics Vol.35 No.5
Aminotransferases are pyridoxal 50-phosphatedependent enzymes that play crucial roles in plant growth, development, and responses to abiotic stress. The class III aminotransferase family (ATIII family) is an important subfamily. However, no characterization of rice ATIII genes has been previously reported. Using available rice genome sequence information, we identified 12 japonica and 13 indica ATIII genes that were randomly localized on chromosomes 2, 3, 4, 5, 7, 8, and 11. Information provided by the Plant Genome Duplication Database revealed that four japonica and four indica ATIII genes are the results of segmental duplications, and two japonica and six indica genes resulted from tandem duplications. A phylogenetic analysis of the ATIII genes in japonica, indica and Arabidopsis enabled the classification of the genes into six different groups, and the characteristics were established before the monocot-dicot and japonica–indica split. An analysis of the Ka/Ks, divergence time and average indel length suggested the diverse selection styles of the duplicated gene pairs. Gene structure and motif analyses revealed that the ATIII gene family has experienced extensive divergence. Real-time PCR was performed to examine the expression pattern of the japonica ATIII genes in response to various abiotic stresses including drought, salt, and cold. The results suggested that most of the genes were differentially up- or down-regulated in rice seedlings in response to at least one stress factor, which indicates the key role of the rice ATIII gene family in responding to abiotic stresses. These results provide a basis for elucidating the roles of the ATIII genes and their further functional analysis under abiotic stresses.
A New C-10 Acetylene and A New Triterpenoid from Conyza canadensis
Wei Dong Xie,Xue Gao,Zhong Jian Jia 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.5
From the whole plants of Conyza canadensis (Compositae), a new C-10 acetylene, namely 8R, 9R-dihydroxymatricarine methyl ester (1), and a new triterpenoid, namely 3β, 16β, 20β–trihydroxytaraxast- 3-O-palmitoxyl ester (4), were isolated along with eleven known compounds (2, 3, 5-13). The structures of all 13 compounds were elucidated on the basis of their spectral data. The antibacterial activities of compounds 1-3 were evaluated.
A New C-10 Acetylene and A New Triterpenoid from Conyza canadensis
Xie, Wei-Dong,Gao, Xue,Jia, Zhong Jian 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.5
From the whole plants of Conyza canadensis (Compositae), a new C-10 acetylene, namely 8R, 9R-dihydroxymatricarine methyl ester (1), and a new triterpenoid, namely 3${\beta}$ 16${\beta}$, 20${\beta}$-trihydroxytaraxast-3-O-palmitoxyl ester (4), were isolated along with eleven known compounds(2, 3, 5-13). The structures of all 13 compounds were elucidated on the basis of their spectral data. The antibacterial activities of compounds 1-3 were evaluated.
Jian Liu,Chaohong Dong,Dongdong Wei,Zheng Zhang,Weihao Xie,Qun Li,Zhou Lu 한국섬유공학회 2019 Fibers and polymers Vol.20 No.7
A novel polysiloxane quaternary ammonium salt (NCTSi) was synthesized and used as antibacterial andhydrophobic agent for cotton fabric. The chemical structures were characterized by FT-IR. The surface morphology of treatedcotton fabrics was characterized by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). Thecotton fabrics treated with NCTSi showed excellent antibacterial properties against Gram-positive bacteria S. aureus andGram-negative bacteria E. coli. The E. coli antibacterial rate was about 99.52 % and the S. aureus antibacterial rate was about98.33 %, with only a slight decrease after 20 cycles of standard washing, to 91.43 % and 93.33 %, respectively. The inhibitionzone was 2 mm and 2.5 mm against E. coli and S. aureus when NCTSi concentration was 4 %. The treated cotton fabricsprovided excellent hydrophobic properties, and the water contact angle (WCA) reached 124.14 º compared to pure cottonfabrics. The mechanical properties and whiteness were also investigated. As a result of the performed modifications,multifunctional fabrics with a considerably increased hydrophobicity and high antibacterial property were obtained.
Wei Ren,Yunfang Yu,Huangming Hong,Ying Wang,Quanlong Gao,Yongjian Chen,Peixian Chen,Jianli Zhao,Qiyun Ou,Dagui Lin,Tuping Fu,Yujie Tan,Chenchen Li,Xinxin Xie,Guolin Ye,Jun Tang,Herui Yao 대한암학회 2022 Cancer Research and Treatment Vol.54 No.4
Purpose This study aims to comprehensively evaluate the clinical efficacy of chemotherapy or endocrine therapy maintenance in metastatic breast cancer (MBC) patients. Materials and Methods The meta-analysis of randomized clinical trials (RCTs) and propensity score matching of multicenter cohort study evaluated MBC patients who underwent first-line chemotherapy or endocrine therapy maintenance. This study is registered with PROSPERO: CRD42017071858 and ClinicalTrials.gov: NCT04258163. Results A total of 2,867 patients from 15 RCTs and 760 patients from multicenter cohort were included. The results from meta-analysis showed that chemotherapy maintenance improved progression-free survival (PFS) (hazard ratio [HR], 0.63; 95% confidence interval [CI], 0.54 to 0.73; p < 0.001; moderate-quality evidence) and overall survival (OS) (HR, 0.87; 95% CI, 0.78 to 0.97; p=0.016; high-quality evidence) than observation. In the cohort study, for hormone receptor–positive MBC patients, chemotherapy maintenance improved PFS (HR, 0.67; 95% CI, 0.52 to 0.85; p < 0.001) and OS (HR, 0.55; 95% CI, 0.42 to 0.73; p < 0.001) compared with observation, and endocrine therapy maintenance also improved PFS (HR, 0.65; 95% CI, 0.53 to 0.80; p < 0.001) and OS (HR, 0.55; 95% CI, 0.44 to 0.69; p < 0.001). There were no differences between chemotherapy and endocrine therapy maintenance in PFS and OS (all p > 0.05). Regardless of the continuum or switch maintenance therapy, showed prolonged survival in MBC patients who were response to first-line treatment. Conclusion This study provided evidences for survival benefits of chemotherapy and endocrine therapy maintenance in MBC patients, and there was no difference efficacy between chemotherapy and endocrine therapy maintenance for hormone receptor–positive patients.
Jian Peng,Wei Sun,Haisheng Han,Le Xie,Yao Xiao 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.11
Recently, the fluidized bed has been shown to assist in improving the recovery of coarse minerals during flotation. In this study, the fluidization characteristics of spherical and irregular particles in a three-dimensional liquidsolid fluidized bed were studied by combining experimental and computational fluid dynamics (CFD) methods. Fluidization experiments were performed to investigate the effect of superficial velocity, particle shape, and particle size on solid holdup and bed expansion height. CFD model coupled different drag models for spherical and irregular particles were developed and validated by the experimental data of bed expansion ratio and pressure drop. Based on 3D CFD simulations, the axial and radial direction distributions of solid holdup, axial velocity, as well as granular temperature were obtained. Their distribution characteristics were analyzed and discussed in detail. The reported experimental data and simulation results can improve the understanding of irregular granular liquid-solid fluidized bed and provide a basis for further research on fluidized bed flotation.