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| 1 | 丝虫病传播阈值的研究显示文摘在浙江、河南等11个省、自治区选择经过海群生防治、丝虫和蚊媒种类有代表性的地方建点21个,不采取防治措施,纵向观察3-5年。主要结果:①279例残存微丝蚴血症者大部陆续自然转阴;②微丝蚴率,20个点逐年下降,1个点徘徊在原水平;③12个点的蚊媒已未查见幼丝虫。结果表明,在以人饵蚊帐诱捕法调查,蚊媒叮人率为20-50只/人、夜,和有40%左右居民合理使用蚊帐防蚊的情况下,20个点的微丝蚴率,班氏丝虫病点≤1.71%,马来丝虫病点≤1.55%,残存微丝蚴血症者60μl血平均密度大多在3-10条,只有个别的密度较高,丝虫病的传播处于阈值以下,趋于阻断;1个徘徊于原水平的马来丝虫病点,微丝蚴率为2.31%,有1例微丝蚴血症者密度较高(54条/60μl),处于丝虫病传播临界水平。 | Shi Zong Jun | 1994 | 中国寄生虫学与寄生虫病杂志1994，12，1： | 49 |
| 2 | Comparative studies on epithelial lesions at gastric cardia and pyloric antrum in subjects from a high incidence area for esophageal cancer in Henan,China显示文摘ComparativestudiesonepitheliallesionsatgastriccardiaandpyloricantruminsubjectsfromahighincidenceareaforesophagealcancerinHena... | GAO ShanShan1, ZHOU Qi1, LI YongXin1, BAI YongMin1, ZHENG ZuoYu1, ZOU JianXiang1, LIU Gang1, FAN ZongMin1, QI YiJun1, ZHAO Xin1 and WANG LiDong1,2Keywords esophageal neoplasms stomach neoplasms gastric ca | 1998 | World Journal of Gastroenterology1998，4，4： | 8 |
| 3 | H2 strain attenuated live hepatitis A vaccines:protective efficacy in a hepatitis A outbreak显示文摘AIM To investigate the protective efficacy ofH2 strain attenuated live hepatitis A vaccines(H2-strain vaccines)in hepatitis A(HA)outbreaks.METHODS With the permission of theirparents,5551 pre-school and grade 1-3 primaryschool children were inoculated with 1 dose(106.5TCID50)of H2-strain vaccines in anonrandomized,controlled trial conducted inFucheng County,Hebei Province in May 1997.Another 6485 children in the same grades andcompatible in gender and age were enrolled ascontrols.Epidemiological and serological surveywas conducted to evaluate the protectiveefficacy of the vaccines.ELISA was used todetect serum IgM anti-HAV.RESULTS HA outbreak started in early May1998,peaked in the middle of the same month,and lasted about 80 days.Overall 302 HA caseswere found,192(53.58%)were 5-9 years old.One vaccinee and 25 control cases were found tohave hepatitis A,which account for 0.28%(1/356)and 5.92%(25/422)of all vaccinees andcontrols in the 14 villages,respectively.The protective efficacy of vaccines was 95.27%(95% Cl:85.83%-104.72%).In subjects testedfor anti-HAV IgM from 13 villages,1(0.40%)overt and 11(4.06%)asymptomatic HAV caseswere found in 271 vaccinees,but 21(6.69%)ofovert and asymptomatic ones were found in 314controls.CONCLUSION H2 strain vaccines were excellent in preventing overt hepatitis A, but not so effective in preventing asymptomatic hepatitis A virus infection. A booster dose might be needed to get permanent reliable immunity. | Yu Liang Zhao Zong Da Meng Zhi Yi Xu Jun Jie Guo Shao Ai Chai Cheng Gang Duo Xuan Yi Wang Jin Feng Yao Hong Bin Liu Shun Xiang Qi Hui Bin Zhu | 2000 | World Journal of Gastroenterology2000，6，6： | 7 |
| 4 | An-Luo-Hua-Xian Pill Improves the Regression of Liver Fibrosis in Chronic Hepatitis B Patients Treated with Entecavir显示文摘Background and Aims:Chronic hepatitis B(CHB)can cause liver fibrosis and lead to cirrhosis and cancer.As the effectiveness of antiviral therapy to reverse liver fibrosis is limited,We aimed to evaluate the effect of An-Luo-Hua-Xian pill(ALHX)on fibrosis regression in CHB patients treated with entecavir(ETV).Methods:Treatment-naïve patients with CHB were randomly treated with ETV alone or combined with ALHX(ETV+ALHX)between October 1,2013 and December 31,2020.Demographic,laboratory,and liver histology data before and after 78 weeks of treatment were collected.The Ishak fibrosis score(F)was used and fibrosis regression required a decrease in F of≥1 after treatment.Results:A total of 780 patients were enrolled,and 394 with a second liver biopsy after treatment were included in the per-protocol population,132 in ETV group and 262 in ETV+ALHX group.After 78 weeks of treatment,the fibrosis regression rate in the ETV+ALHX group was significantly higher than that of the ETV group at baseline F≥3 patients:124/211(58.8%)vs.45/98(45.9%),p=0.035.The percentage of patients with a decreased liver stiffness measurement(LSM)was higher in the ETV+ALHX group:156/211(73.9%)vs.62/98(63.%),p=0.056.Logistic regression analysis showed that ETV combined with ALHX was associated with fibrosis regression[odds ratio(OR)=1.94,p=0.018],and a family history of hepatocellular carcinoma was on the contrary.(OR=0.41,p=0.031).Conclusions:ETV combined with ALHX increased liver fibrosis regression in CHB patients. | Yi-Qi Liu Chi Zhang Jia-Wen Li Li-Hua Cao Zhan-Qing Zhang Wei-Feng Zhao Qing-Hua Shang Da-Zhi Zhang An-Lin Ma Qing Xie Hong-Lian Gui Guo Zhang Ying-Xia Liu Jia Shang Shi-Bin Xie Jun Li Xu-Qing Zhang Zhi-Qiang Zou Yu-Ping Chen Zong Zhang Ming-Xiang Zhang Jun Cheng Fu-Chun Zhang Li-Hua Huang Jia-Bin Li Qing-Hua Meng Hai-Bin Yu Yu-Qiang Mi Yan-Zhong Peng Zhi-Jin Wang Li-Ming Chen Fan-Ping Meng Wan-Hua Ren Lang Bai Yi-Lan Zeng Rong Fan Xian-Zhi Lou Wei-Feng Liang Hui Liu Hui Zhuang Hong Zhao Gui-Qiang Wang | 2023 | Journal of Clinical and Translational Hepatology2023，11，2： | 7 |
| 5 | Synergistic regulation of drought-responsive genes by transcription factor OsbZIP23 and histone modification in rice显示文摘Thousands of differentially expressed genes(DEGs)have been identified in rice under drought stress conditions.However,the regulatory mechanism of these DEGs remains largely unclear.Here,we report an interplay between histone H3K4me3 modification and transcription factor Osb ZIP23 in the regulation of a dehydrin gene cluster under drought stress conditions in rice.When the H3K4me3 modification level was increased,the dehydrin gene expression levels were increased,and the binding levels of Osb ZIP23 to the promoter of the dehydrin genes were also enhanced.Conversely,the H3K4me3 modification and dehydrin gene expression levels were downregulated in the osbzip23 mutant under drought stress conditions.Our study uncovers a collaboration between transcription factor and H3K4me3 modification in the regulation of droughtresponsive genes,which will help us to further understand the gene regulation mechanism under stress conditions in plants. | Wei Zong Jun Yang Jie Fu Lizhong Xiong | 2020 | Journal of Integrative Plant Biology2020，62，6： | 6 |
| 6 | Highly efficient synthesis of 2,3-dihydroquinazolin-4(1H)-ones catalyzed by heteropoly acids in water显示文摘Heteropoly,酸高效地在周围的温度在水里与醛催化 anthranilamide 的 cyclocondensation 反应并且负担得起 -quinazolinones 加重在的相应 2,3-dihydro-4 (1H ) 对优秀收益好。这个方法提供温和反应条件和干净反应侧面,用催化剂和一个简单 workup 过程的小数量。 | YingXiao Zong Yan Zhao WenCai Luo Xing Hai Yu Jun Ke Wang Yi Pan | 2010 | Chinese Chemical Letters2010，21，7： | 6 |
| 7 | A randomized, controlled, multicenter study comparing intensity-modulated radiotherapy plus concurrent chemotherapy with chemotherapy alone in gastric cancer patients with D2 resection显示文摘 | Wei-guo Zhu Da-fu Xua Jun Pu Cheng-dong Zong Tao Li Guang-zhou Tao Fu-zhi Ji Xi-lei Zhou Ji-hua Han Cheng-shi Wang Chang-hua Yu Jiang-guo Yi Xi-long Su Jin-xia Ding | 2012 | Radiotherapy and Oncology2012，，3： | 6 |
| 8 | Surveillance on the Immune Effectiveness of Quadrivalent and Trivalent Split Influenza Vaccines—Shenzhen City and Changzhou City,China,2018–2019显示文摘Summary What is already known about this topic?Vaccinations are the most effective way to prevent influenza virus infections and severe outcomes.Influenza vaccine effectiveness can vary by seasons.What is added by this report?This report monitors the antibody level among the population over time after administration of the quadrivalent or trivalent split influenza vaccine.What are the implications for public health practice?Real-time monitoring of serum antibody changes after vaccination provides important data for the development of reasonable and effective strategies for influenza prevention and control. | Liumei Shu Jie Zhang Xiang Huo Cong Chen Shisong Fang Kexin Zong Yuanyuan Guo Yingze Zhao Jun Zhang Changjun Bao Junjie Xia Fengcai Zhu Dayan Wang Guizhen Wu George F.Gao William J.Liu | 2020 | China CDC weekly2020，2，21： | 5 |
| 9 | Structural shift of gut microbiota during chemopreventive effects of epigallocatechin gallate on colorectal carcinogenesis in mice显示文摘AIM To investigate the effect of epigallocatechin gallate(EGCG) on structural changes of gut microbiota in colorectal carcinogenesis.METHODS An azoxymethane(AOM)/dextran sodium sulfate(DSS)-induced colitis mouse model was established. Fortytwo female FVB/N mice were randomly divided into the following three groups: group 1(10 mice, negative control) was treated with vehicle, group 2(16 mice, positive control) was treated with AOM plus vehicle, and group 3(16 mice, EG) was treated with AOM plus EGCG. For aberrant crypt foci(ACF) evaluation, the colons were rapidly took out after sacrifice, rinsed with saline, opened longitudinally, laid flat on a polystyrene board, and fixed with 10% buffered formaldehyde solution before being stained with 0.2% methylene blue in saline. For tumor evaluation, the colon was macroscopically inspected and photographed, then the total number of tumors was enumerated and tumor size measured. For histological examination, the fixed tissues were paraffin-embedded and sectioned at 5 mm thickness. Microbial genomic DNA was extracted from fecal and intestinal content samples using a commercial kit. The V4 hypervariable regions of 16 S r RNA were PCR-amplified with the barcoded fusion primers. Using the best hit classification option, the sequences from each sample were aligned to the RDP 16 S r RNA training set to classify the taxonomic abundance in QIIME. Statistical analyses were then performed.RESULTS Treatment of mice with 1% EGCG caused a significant decrease in the mean number of ACF per mouse, when compared with the model mice treated with AOM/DSS(5.38 ± 4.24 vs 13.13 ± 3.02, P < 0.01). Compared with the positive control group, 1% EGCG treatment dependently decreased tumor load per mouse by 85%(33.96 ± 6.10 vs 2.96 ± 2.86, respectively, P < 0.01). All revealed that EGCG could inhibit colon carcinogenesis by decreasing the number of precancerous lesions as well as solid tumors, with reduced tumor load and delayed histological progression of CRC. During the cancerization, the diversity of gut microbiota increased, potential carcinogenic bacteria such as Bacteroides were enriched, and the abundance of butyrate-producing bacteria(Clostridiaceae, Ruminococcus, etc.) decreased continuously. In contrast, the structure of gut microbiota was relatively stable during the intervention of EGCG on colon carcinogenesis. Enrichment of probiotics(Bifidobacterium, Lactobacillu, etc.) might be a potential mechanism for EGCG's effects on tumor suppression. Via bioinformatics analysis, principal coordinate analysis and cluster analysis of the tumor formation process, we found that the diversity of gut microbiota increased in the tumor model group while that in the EGCG interfered group(EG) remained relatively stable.CONCLUSION Gut microbiota imbalance might be a potential mechanism for the prevention of malignant transformation by EGCG, which is significant for diagnosis, treatment, prognosis evaluation, and prevention of colorectal cancer. | Xin Wang Tao Ye Wen-Jie Chen You Lv Zong Hao Jun Chen Jia-Ying Zhao Hui-Peng Wang Yuan-Kun Cai | 2017 | World Journal of Gastroenterology2017，23，46： | 5 |
| 10 | Postoperative chemotherapy with S-1 plus oxaliplatin versus S-1alone in locally advanced gastric cancer(RESCUE-GC study): a protocol for a phase Ⅲ randomized controlled trial显示文摘Background:The ACTS-GC study had shown postoperative adjuvant therapy with S-1 improved survival of patients with locally advanced gastric cancer.Addition of oxaliplatin to S-1 is considered to be acceptable as one of the treatment options for gastric cancer patients after radical gastrectomy with D2 lymph node excision.Methods:We have commenced a randomized phase III trial in December 2016 to evaluate S-1 plus oxaliplatin compared with S-1 alone in the adjuvant setting for locally advanced gastric cancer.A total of 564 patients will be accrued from 13 Chinese institutions in two years.The primary endpoint is 3-year relapse-free survival.The secondary endpoints are 5-year overall survival,proportion of patients who complete the postoperative chemotherapy and incidence of adverse events.Ethic and dissemination:The trial has been approved by the institutional review board of each participating institution and it was activated on December,2016.The enrollment will be finished in December,2018.Patient’s follow-up will be ended until December,2023.Trial registration:Clinical Trials.gov,identifier:NCT02867839.Registered on August 4,2016. | Xiang Hu Lin Chen Yian Du Biao Fan Zhaode Bu Xin Wang Yingjiang Ye Zhongtao Zhang Gang Xiao Fei Li Qingsi He Guoli Li Xian Shen Bin Xiong Liming Zhu Jiwei Liui Lian Liu Tao Wu Jing Zhou Jun Zhang Gang Zhao Xulin Wang Pin Liang Xinxin Wang Yan Zhang Xiaojiang Wu Ji Zhang Xin Ji Xianglong Zong Tao Fu Ziyu Jia Jiafu Ji | 2017 | Chinese Journal of Cancer Research2017，29，2： | 5 |
| 11 | Onodera's Prognostic Nutritional Index is a novel and useful prognostic marker for gastrointestinal stromal tumors显示文摘BACKGROUND Immunoinflammatory markers such as the peripheral blood neutrophil-tolymphocyte ratio(NLR)and the platelet-to-lymphocyte ratio(PLR)have gained considerable attention as prognostic markers in gastrointestinal stromal tumors(GISTs).AIM To assess the prognostic value of Onodera’s Prognostic Nutritional Index(OPNI)for GISTs.METHODS All patients who had undergone surgical resection for a primary,localized GIST from 2009 to 2016 at our cancer center were initially and retrospectively identified.Recurrence-free survival(RFS)was calculated by the Kaplan-Meier method and compared by the log-rank test.We used multivariate Cox proportional hazard regression models to identify associations with outcome variables.RESULTS A total of 235 GISTs were identified and included for analysis under our inclusion criteria.Univariate and multivariate analyses both identified the OPNI as an independent prognostic marker,and the OPNI was associated with the primary site,tumor size,mitotic index,tumor rupture,necrosis,and modified NIH risk classification.Low OPNI(<51.30;hazard ratio=5.852;95% confidence interval:1.072–31.964;P=0.0414)was associated with worse RFS.The 2-and 5-year RFS rates of the patients with a low OPNI were 92.83% and 76.22%,respectively,whereas 100% and 98.41% were achieved by the patients with a high OPNI.CONCLUSION The preoperative OPNI is a novel and useful prognostic marker for GISTs. | Hao Wang Ying-Ying Xu Jun You Wen-Qing Hu Shao-Feng Wang Ping Chen Fan Yang Lei Shi Wei Zhao Liang Zong | 2021 | World Journal of Gastrointestinal Surgery2021，13，10： | 4 |
| 12 | Greenhouse gas emissions from a constructed wetland for municipal sewage treatment显示文摘The fluxes of greenhouse gases (methane and nitrous oxide) emission from a constructed wetland in the Eastern China as municipal sewage treatment were measured from June 1999 to August 2000 by the closed chamber method. The constructed wetland for municipal sewage treatment is a significant source of methane, up to 976 6×10 6 g CH 4/a, which was emitted from the constructed wetland with the area of 495000 m 2 and wastewater loading rate of 12000 m 3/d. Its daily mean methane flux reached 5 22 g CH 4/(m 2·d), 250 times as much as that in natural wetland in the same latitude region. 227 8 mg CH 4 was produced from the treatment of 1 liter wastewater, up to 700—1000 times as much as that in the secondary treatment. The emission of nitrous oxide from the constructed wetland is not higher than that from secondary treatment of wastewater, only 0 07 mgN 2O/L. | TAI Pei dong 1, LI Pei jun 1 , SUN Tie heng 1, HE Yao wu 1, ZHOU Qi xing 1 GONG Zong qiang 1, Motoyuki Mizuochi 2, Yuhei Inamori 2 (1 Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110015, China. 2 National Insti | 2002 | Journal of Environmental Sciences2002，14，1： | 3 |
| 13 | The varieties of Heisenberg vertex operator algebras显示文摘For a vertex operator algebra V with conformal vector ω,we consider a class of vertex operator subalgebras and their conformal vectors.They are called semi-conformal vertex operator subalgebras and semiconformal vectors of(V,ω),respectively,and were used to study duality theory of vertex operator algebras via coset constructions.Using these objects attached to(V,ω),we shall understand the structure of the vertex operator algebra(V,ω).At first,we define the set Sc(V,ω)of semi-conformal vectors of V, then we prove that Sc(V,ω)is an affine algebraic variety with a partial ordering and an involution map.Corresponding to each semi-conformal vector,there is a unique maximal semi-conformal vertex operator subalgebra containing it.The properties of these subalgebras are invariants of vertex operator algebras.As an example,we describe the corresponding varieties of semi-conformal vectors for Heisenberg vertex operator algebras.As an application,we give two characterizations of Heisenberg vertex operator algebras using the properties of these varieties. | CHU Yan Jun LIN Zong Zhu | 2017 | Science China Mathematics2017，60，3： | 3 |
| 14 | Study on the kinetic model of Cr/H/Air/Cl mixture显示文摘Constructing a reasonable reaction kinetic model for Cr-containing waste incineration is of high significance to study the effect of various factors,such as temperature,Cl,on its hexavalent chromium compounds.In this paper,a primary Cr/H/Air/Cl reaction kinetic model is built and studied by Gaussian 03 code with quantum chemistry theory.Numerical results show that there are two overall reactions in the model,each of the two overall reactions consists of their respective two elementary reactions.So the two overall reactions should be omitted from the model.Instead,the four elementary reactions should be added in the Cr/H/Air/Cl reaction kinetic model.The activation energies of the four elementary reactions are also calculated. | Xuefeng Lv Jun Cai Suyuan Yu Haihuan Zong | 2010 | Journal of Thermal Science2010，19，3： | 3 |
| 15 | Serosurvey of Avian metapneumovirus, Orithobacterium rhinotracheale, and Chlamydia psittaci and Their Potential Association with Avian Airsacculitis显示文摘Seasonal outbreaks of airsacculitis in China's poultry cause great economic losses annually.This study tried to unveil the potential role of Avian metapneumovirus(AMPV),Ornithobacterium rhinotracheale(ORT) and Chlamydia psittaci(CPS) in avian airsacculitis.A serological investigation of 673 breeder chickens and a case-controlled study of 430 birds were undertaken.Results showed that infection with AMPV,ORT,and CPS was highly associated with the disease.The correlation between AMPV and CPS were positively robust in both layers and broilers.Finally,we determined the co-infection with AMPV,ORT,and CPS was prevalent in the sampled poultry farms suffering from respiratory diseases and the outbreak of airsacculitis was closely related to simultaneous exposure to all three agents. | ZUO Zong Hui ZHANG Tian Yuan GUO Yong Xia CHU Jun QU Guang Gang MIAO Li Zhong SHEN Zhi Qiang HE Cheng | 2018 | Biomedical and Environmental Sciences2018，31，5： | 3 |
| 16 | MAGI3 Suppresses Glioma Cell Proliferation via Upregulation of PTEN Expression显示文摘Objective To investigate the role and molecular mechanism of membrane-associated guanylate kinase inverted 3(MAGI3) in glioma cell proliferation. Methods The expression levels of MAGI3 and PTEN were assessed in glioma samples by Western blotting. MAGI3 was stably transfected into C6 glioma cells to obtain C6-MAGI3 cells. Then, the proliferation, the expression levels of MAGI3 and PTEN, and Akt phosphorylation were evaluated in C6 and C6-MAGI3 cells. Xenograft tumor models were established by subcutaneous injection of C6 and C6-MAGI3 cells into nude mice, and the growth rates of xenografts in the mice were compared. The potential role of MAGI3 expression in PI3K/Akt signaling activation was further investigated by examining the correlation between MAGI3 expression and the expression of PI3K/Akt signaling downstream target genes in a glioma dataset using gene set enrichment analysis(GSEA). Results Expression levels of MAGI3 and PTEN were significantly downregulated in gliomas. Overexpression of MAGI3 in the glioma C6 cell line upregulated PTEN protein expression, inhibited the phosphorylation of Akt, and suppressed cell proliferation. MAGI3 overexpression also inhibited the growth of C6 glioma tumor xenografts in nude mice. Analysis based on the GEO database confirmed the negative correlation between activation of PI3K/Akt pathway and MAGI3 mR NA levels in human glioma samples. Conclusion The loss of MAGI3 expression in glioma may enhance the proliferation of glioma cells via downregulation of PTEN expression, leading to the activation of the PI3K/Akt pathway. MAGI3 is a potential glioma suppressor. | MA Qian ZHANG Yan MENG Ran XIE Kun Ming XIONG Ying LIN Song HE Zong Lin K. TAO Tao YANG Ying ZHAO Ji Zong HE Jun Qi | 2015 | Biomedical and Environmental Sciences2015，28，7： | 3 |
| 17 | Effect of Cadmium on Rat Leydig Cell Testosterone Production and DNA Integrity in vitro显示文摘Cadmium(Cd)is an elemental heavy metal with widely recognized toxicity.Its long-term use in industrial processes and daily activities has caused alarming levels of Cd contamination in the natural environment.According to the estimates by the Agency of Toxic Substances and Disease Registry in the US,25 000 to 30 000 metric tons of Cd is annually released to the environment[1].Results of previous studies have demonstrated that several organs are targets of Cd,but the most important of these targeted organs may be the testes.Cadmium can cause the apoptosis of testis cells and modify | LIU Qing GU Jian Hong YUAN Yan LIU Xue Zhong WANG Ya Jun WANG Han Dong LIU Zong Ping WANG Zong Yuan BIAN Jian Chun | 2013 | Biomedical and Environmental Sciences2013，26，9： | 3 |
| 18 | A Novel Dimer──Heteropolytungstate with a Vanadium Atom as the Centre ──Synthesis and Structural Characterization of (H_3O)_4[VW_(12)O_(40)Na(H_2O)_4]_2显示文摘A novel dimer tungstovanadate, (H 3O) 4[VW 12 O 40 Na(H 2O) 4] 2, was hydrothermally synthesized and structurally characterized by single crystal X ray diffraction, IR spectra, TGA DSC thermal analysis and polarograpy. The yellowish crystal crystallized in the triclinic system, space group P1, a =1 464 5(3) nm, b =1 468 6(3) nm, c =1 411 1(3) nm, α=111 82(2)°, β=93 17(3)°, γ=117 47(3)°, V =2 210 6(8) nm 3, Z=1, D c=4 552 g·cm -3 , λ (Mo Kα )=0 071 073 nm, μ =31 402 mm -1 , F(000)=2 648, R =0 078 0. The title compound consists of two Keggin structure units linked together with two hydrated sodium cations to form a dimer with a porous structure with the pore dimension of 0 766 nm×0 778 5 nm. [WT5FZ] | LIU Zong rui 1,2 , XU Lin 1, WANG En bo 1,** , PENG Jun 1, HU Chang wen 1 XING Yan 3, LIN Yong hua 3 and JIA Heng qing 3 (1. Department of Chemistry, Northeast Normal University, Changchun 130024, P. R. China 2. Inner Mongolia Teac | 2000 | Chemical Research in Chinese Universities2000，16，3： | 2 |
| 19 | Alkoxy substituted MeO-BIPHEP-type diphosphines ligands for asymmetric hydrogenation of aryl ketones显示文摘In this paper,a series of optically active MeO-BIPHEP-type ligands,(S)-6,6′-dimethoxy-2,2’-bis(di-p-alkoxyphenylphosphine)- 1,1′-biphenyl were synthesized and used to prepare the ruthenium complex.The effects of para-substituted were observed,the results showed that the ruthenium catalysts[diphosphine RuCl2 diamine]containing both t-Bu and i-Pr substitutions have better activities and enantioselectivities than the non-substituted ruthenium catalysts in the asymmetric hydrogenation of acetophenone. | Meng Lin Ma Zong Hai Peng Yu Guo Li Chen Hua Chen Xian Jun Li | 2010 | Chinese Chemical Letters2010，21，5： | 2 |
| 20 | Enhancement of strength-ductility balance of heavy Ti and Al alloyed FeCoNiCr high-entropy alloys via boron doping显示文摘As one of the most effective mechanisms,precipitation-hardening is widely used to strengthen high-entropy alloys.Yet,heavy precipitation-hardened high-entropy alloys usually exhibit serious embrittlement.How to effectively achieve ultra-high strength and maintain reliable ductility remains a challenge.Here,we report a study of doping extremely little boron to meet this target.We found that adding of 30 ppm boron into the heavy Ti and Al alloyed FCC FeCoNiCr high-entropy,(FeCoNiCr)_(88) Ti_(6) Al_(6) HEA(at.%)which is strengthened mainly by both coarse BCC-based(Ni,Co)_(2) TiAl Heusler and fine L12-type FCC-based(Ni,Co)_(3) TiAl precipitates and shows ultrahigh strength but poor ductility,could significantly change the original microstructure and consequently improve mechanical performance,owing to the well-known effect of boron on reducing the energy of grain boundaries.The boron addition can(1)eliminate microcavities formed at Heusler precipitate-matrix interfaces;(2)suppress the formation and segregation of coarse BCC Heusler precipitates;(3)promote the formation of L12 nanoparticles.This changes of microstructure substantially improve the tensile ductility more than by~86%and retain comparable or even better ultimate tensile strength.These findings may provide a simple and costless solution to produce heavy precipitation-strengthened HEAs with ultrahigh strength and prevent accidental brittleness. | Yongliang Qi Tinghui Cao Hongxiang Zong Yake Wu Lin He Xiangdong Ding Feng Jiang Shenbao Jin Gang Sha Jun Sun | 2021 | Journal of Materials Science & Technology2021，，16： | 2 |
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