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Surface-clean low-doped PdB/C as superior electrocatalysts toward ethanol oxidation in alkaline media

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Journal of Energy Chemistry 2018年第2期27卷 389-394页

作者： Yuan-Fang Wang Chan Zhu Yao-Yue Yang zhi-Gang Zhao College of Chemistry and Environmental Protection Engineering Southwest Minzu University

Developing highly active, low-cost and organic surfactants-free Pd-based catalysts for ethanol oxidation reaction（EOR） is now critically important for direct ethanol fuel cells. Herein, surface-clean low-doped PdB/C catalysts（typically ca. 1.5 at% of B） are successfully prepared in an aqueous condition without adding any organic surfactants. TEM characterization shows that as-prepared low-doped Pd B nanoparticles are evenly distributed on carbon support. Cyclic voltommagrams of as-prepared low-doped PdB/C in 0.5 M NaOH ＋ 1 M C2H5OH indicate that its onset oxidation potential of ethanol is ca. 80-120 mV more negative than that on commercial Pd/C. Meanwhile, the EOR mass activity of our home-made catalysts is up to 4018 m A·mg-1 Pd. Moreover, the durability on low-doped PdB/C catalysts is at most 2 times higher than that on commercial Pd/C. Geometric and electronic effects are adopted to understand the above mentioned enhancement of activity and durability. This work may provide a facile, low-cost and green strategy on preparing electrocatalysts toward EOR in alkaline media.

关键词： EOR Surface-clean low-doped PdB/C Alkaline media Geometric and electronic effects

Association between 5α-reductase inhibitors therapy and incidence, cancer-specific mortality,and progression of prostate cancer: evidence from a meta-analysis

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Asian Journal of Andrology 2020年第5期22卷 532-538页

作者： Lian-Min Luo Re-Dian Yang Jia-Min Wang Shan-Kun zhao Yang-Zhou Liu zhi-Guo Zhu Qian Xiang zhi-Gang Zhao Department of Urology and Andrology Minimally Invasive Surgery CenterGuangdong Provincial Key Laboratory of UrologyThe First Affiliated Hospital of Guangzhou Medical UniversityGuangzhou 510230China.

5a-reductase inhibitors(5-ARI)are widely employed for the treatment of benign prostatic hyperplasia.It has been noted that 5-ARI exhibit the potential to attenuate the risk of prostate cancer,but consistent agreement has not been achieved.Moreover,the effect of 5-ARI on cancer-specific mortality and progression of prostate cancer remains unclear.Therefore,the goal of the current meta-analysis was to elucidate the impact of 5-ARI on the incidence and progression of prostate cancer.We searched for all studies assessing the effect of 5-ARI on risk of prostate cancer in PubMed,Embase,Medline,and Cochrane Library databases.Pooled relative risk(RR)and corresponding 95%confidence intervals(CIs)were accepted to evaluate the association between 5-ARI and the risk of prostate cancer.Synthetic results implied that subjects who accepted 5-ARI compared with the placebo group experienced a distinctly weakened overall incidence of prostate cancer(RR=0.74;95%C l:0.66-0.82;P7;RR=1.19;95%Cl:0.98-1.43;P=0.069).The results also showed that 5-ARI treatment did not significantly alter prostate cancer-specific mortality(RR=1.0;95%C l:0.95-1.05;P=0.916).In addition,it was worth noting that 5-ARI treatment acted in a protective role that presented a dramatic benefit to delay the progression of low-risk tumors(RR=0.58;95%C l:0.43-0.78;P<0.001).

关键词： 5a-reductase inhibitor meta-analysis prostate cancer

A comparison study of existence forms of Fe species in coke for solution loss reaction of carbon

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Journal of Iron and Steel Research(International) 2018年第7期25卷 692-699页

作者： Qiang Ling Hui-juan zhao Ling-yu Chen Rui-lun Xie zhao Lei zhi-Gang Zhao Anhui Key Laboratory of Coal Clean Conversion and Utilization School of Chemistry and Chemical Engineering Anhui University of Technology Ma'anshan 243002 Anhui China

Fe species were loaded by two different loading ways （absorption method and addition method） to investigate their effect on thermal properties of coke. The particulate coke reactivity of coke samples indicated that the added sample showed higher catalytic activity than the adsorbed sample at first, owing to the decreased structure and properties of coke and more catalytic active sites caused by the strong interaction between Fe species and coke. The presence of Fe species in the added sample weakened the microstructure of coke, and the Fe species were easier to be reduced than those in the absorbed sample due to its different existence form in coke. With further increased loading of Fe species, the different existence positions of Fe species caused more decrease in surface active sites in the added sample than in the adsorbed sample, leading to lower catalytic activity of added sample when the total iron content exceeded 1%. The catalytic mechanism implied that there may be a catalytic dominant factor change in the reaction between the catalytic effect of iron species and carbon surface active sites in coke; the catalytic effect of iron species is dominant in the reaction at first, but the catalytic effect of carbon surface active sites is dominant in the reaction with the further increased loading amount of Fe species.

关键词： Coke reactivity Catalytic mechanism Coke structure Fe species Existence form

Catalyst-Free Hydroxytrifluoromethylation of Alkenes UsingIodotrifluoromethane

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Chinese Journal of Chemistry 2019年第1期37卷 597-604页

作者： zhaoben Su Yong Guo Qing-Yun Chen zhi-Gang Zhao Bao-Yi Nian College of Chemistry & Environment Protection Engineering Southwest Minzu UniversityChengduSichuan 610041China Key Laboratory of Organofluorine Chemistry Shanghai Institute of Organic ChemistryChinese Academy of Sciencesand University of Chinese Academy of Sciences345 Lingling RoadShanghai 200032China Sanming Institute of Fluorochemical Industry Sanming UniversitySanmingFujian 365004China

The importance of CF3-containing molecules in pharmaceuticals, agrochemicals and materials intrigues the intense interest in synthetic methodology of these compounds. With a purpose to enrich trifluoromethylation methodology, we carefully examined the substrate scope of hydroxytrifluoromethylation of alkenes using iodotrifluoromethane, and the reaction provided β-trifluoromethyl alcohols in good yields under extremely mild conditions without catalysts. We found that our reaction can be applied to not only styrenes but also various aliphatic alkenes with excellent selectivity;no ketone was detected in most of our cases. Another feature of our discovery is “simple”. The reaction was carried out in air, irradiated by visible light, at room temperature and most importantly no catalyst was needed. A solution of CF3I in DMSO was used as the facile trifluoromethylating reagent, which simplified the utilization of gaseous CF3I. Based on 19F NMR spectroscopy, we observed a halogen bond between CF3I and tertiary amine in this reaction. The interaction may promote single electron transfer by the visible light irradiation.

关键词： trifluoromethyl catalyst-free hydroxylation alkenes photochemistry

FRUITFUL RESULTS OF CHINA-CAMBODIA COOPERATION

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China Report ASEAN 2023年第2期8卷 21-23页

作者： Zhang zhao zhi gang 不详

China-Cambodia Free Trade Agreement(CCFTA)inspires‘Diamond Hexagon’cooperation framework From February 9 to 11,Cambodian Prime Minister Hun Sen visited China as the first foreign leader to arrive after the Chinese New Year.On February 10,President Xi Jinping met with Hun Sen and the two sides agreed to jointly commence a new era of building a China-Cambodia community with a shared future.

关键词： jointly Trade Diamond

Perineural invasion of hilar cholangiocarcinoma in Chinese population: One center’s experience

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World Journal of Gastrointestinal Oncology 2020年第4期12卷 457-466页

作者： Cheng-gang Li zhi-Peng Zhou Xiang-Long Tan zhi-Ming zhao Second Department of Hepatobiliary Surgery Chinese PLA General HospitalBeijing 100853China

BACKGROUND Hilar cholangiocarcinoma(HCCA)often produces perineural invasion(PNI)extending to extra-biliary sites,while significant confusion in the incidence of PNI in HCCA has occurred in the literature,and the mechanism of that procedure remains unclear.AIM To summarize the incidence of PNI in HCCA and to provide the distribution of nerve plexuses around hepatic portal to clinical surgeons.METHODS Reported series with PNI in HCCA since 1996 were reviewed.A clinicopathological study was conducted on sections from 75 patients with HCCA to summarize the incidence and modes of PNI.Immunohistochemical stains for CD34 and D2-40 in the cancer tissue were performed to clarify the association of PNI with microvessel and lymph duct.Sections of the hepatoduodenal ligament from autopsy cases were scanned and handled by computer to display the distribution of nerve plexuses around the hepatic portal.RESULTS The overall incidence of PNI in this study was 92%(69 of 75 patients),while the rate of PNI in HCCA in the literature ranging from 38%to 100%.The incidence of PNI did not show any remarkable differences among various differentiated groups and Bismuth-Corlette classification groups.Logistic regression analysis identified the depth of tumor invasion was the only factor that correlated significantly with PNI(P<0.01).In spite of finding tumor cells that could invade microvessels and lymph ducts in HCCA,we did not find tumor cells invaded nerves via microvessels or lymph ducts.Three nerve plexuses in the hepatoduodenal ligament and Glisson’s sheath were classified,and they all surrounded the great vessels very closely.CONCLUSION The incidence of PNI of HCCA in Chinese population is around 92%and correlated significantly with a depth of tumor invasion.It also should be considered when stratifying HCCA patients for further treatment.

关键词： Hilar cholangiocarcinoma Perineural invasion Pathology Nerve plexus Incidence Treatment

Facile synthesis of hierarchical Ni_(3)Se_(2) nanodendrite arrays for supercapacitors

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Journal of Materials Science & Technology 2020年第19期54卷 69-76页

作者： Licheng zhao Ping Zhang Yanan Zhang zhi Zhang Lei Yang zhi-gang Chen School of Materials Science&Engineering Sichuan UniversityChengdu 610064China Center for Nanoscale Characterization&Devices(CNCD) School of Physics&Wuhan National Laboratory for Optoelectronics(WNLO)Huazhong University of Science and Technology(HUST)Wuhan 430074China Centre for Future Materials University of Southern QueenslandSpringfieldQueensland4300Australia

Rational design has been widely used to develop high-performance metal selenides-based electrode materials for supercapacitors.In this study,we develop a facile one-step solvothermal approach to synthesize binder-free Ni_(3)Se_(2) nanodendrite arrays grown on nickel foam as advanced positive electrodes for supercapacitors.Our Ni_(3)Se_(2) nanodendrite arrays on nickel foam exhibit a specific capacitance of 1234 Fg^(-1)(3.70 F cm^(-2))at a current density of 1 Ag^(-1) and a great rate capability,which is benefited from the excellent electrical conductivity and unique hierarchical nano-dendritic structure.Furthermore,an asymmetric supercapacitor device was assembled using activated carbon as the negative electrode and the Ni_(3)Se_(2) nanodendrite arrays on nickel foam as the positive electrode,obtaining a high energy density of 22.3 W h kg^(-1) at a power density of 160.4 W kg^(-1).

关键词： Ni3Se2 Nanodendrite Binder-free Capacitance Supercapacitors

Plasticity of floral sex allocation within inflorescences of hermaphrodite Aconitum gymnandrum

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Journal of Plant Ecology 2015年第2期8卷 130-135页

作者： zhi-Gang Zhao Zuo-Jun Liu Jeffrey K.Conner State Key Laboratory of Grassland and Agro-Ecosystems School of Life SciencesLanzhou University222 Tianshui Road Chengguan DistrictLanzhou 730000China College of Life Science and Engineering Lanzhou University of Technology287 Langongpin Road Qilihe DistrictLanzhou 730000China Kellogg Biological Station and Department of Plant Biology Michigan State University3700 East Gull Lake DriveHickory CornersMI 49060USA

Aims sex allocation in plants is often plastic,enabling individuals to adjust to variable environments.However,the predicted male-biased sex allocation in response to low resource conditions has rarely been experimentally tested in hermaphroditic plants.in particular,it is unknown whether distal flowers in linear inflorescences show a larger shift to male allocation relative to basal flowers when resources are reduced.in this study,we measure position-depend-ent plasticity of floral sex allocation within racemes of Aconitum gymnandrum in response to reduced resource availability.Methods using a defoliation treatment in the field applied to potted plants from a nested half-sibling design,we examined the effects of the treatment,flower position,family and their interactions.Important Findingsallocation to male function increased with more distal flower posi-tion,while female allocation either did not change with position or declined at the most distal flowers.Defoliation significantly reduced the mass of both the androecium and gynoecium,but not anther number or carpel number.gynoecial mass declined more strongly with defoliation than did androecial mass,resulting in a significant increase in the androecium/gynoecium ratio as predicted by sex allocation theory.Plastic responses of androecium mass and gynoecium mass were affected by flower position,with less mass lost in basal flowers,but similar plastic magnitude in both sexual traits across flower position lead to consistent variation in the androecium/gynoecium ratio along the inflorescence.a sig-nificant treatment*paternal family interaction for the androecium/gynoecium ratio is evidence for additive genetic variation for plastic floral sex allocation,which means that further evolution of alloca-tion can occur.

关键词： Aconitum gymnandrum sex allocation plasticity inflorescence architecture

Gender differences in vascular reactivity of mesenteric arterioles in portal hypertensive and non-portal hypertensive rats

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World Journal of Gastroenterology 2019年第39期25卷 5953-5960页

作者： Bin Zhang Lin-Hua Ji Cheng-gang Zhang gang zhao zhi-Yong Wu Department of Gastrointestinal Surgery Ren Ji Hospital School of Medicine Shanghai Jiao Tong University

BACKGROUND Portal hypertension(PHT)is primarily caused by an increase in resistance to portal outflow and secondarily by an increase in splanchnic blood flow.Vascular hyporeactivity both in systemic circulation and in the mesenteric artery plays a role in the hyperdynamic circulatory syndrome.AIM To explore gender differences and the role of endogenous sex hormones in PHT and vascular reactivity of mesenteric arterioles in rats.METHODS Cirrhosis and PHT were established by subcutaneous injection of carbon tetrachloride(CCl4)in both male and female integral and castrated rats(ovariectomized[OVX]in female rats,orchiectomy[ORX]in male rats).The third-order branch of the mensenteric artery was divided and used to measure vascular reactivity to vasoconstrictors.RESULTS No significant difference in portal pressure was observed between integral and castrated male PHT rats(15.2±2.1 mmHg vs 16.7±2.7 mmHg,P>0.05).The portal pressure in integral female PHT rats was lower than that in OVX female PHT rats(12.7±2.7 mmHg vs 16.5±2.4 mmHg,P0.05).However,there was no difference between integral and ORX male rats with PHT.In integral female PHT rats,the concentration response curves were shifted to the left(P<0.05),and the Emax values were increased and EC50 values were decreased compared to OVX female PHT rats.CONCLUSION Clear gender differences were observed in mesenteric vascular reactivity in CCl4-induced cirrhotic and PHT rats.Conservation of estrogen can retain the sensitivity of the mesenteric arterioles to vasoconstrictors and has a protective effect on splanc

关键词： Portal hypertension Vascular reactivity Gender Estrogen Liver cirrhosis