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Effect of rare earth on the coating-forming and mechanism of phosphatization

Journal of Rare Earths 2010年第S1期28卷 132-135页

作者：邝钜炽黄莺 deptment of chemistry and Chemical Engineering Foshan University School of chemistry and Chemical Engineering South China University of Technology

It was ascertained that when a RE element was added in bath,the sample was improved on the anti-corrosion power of the coating because of the increasing of covering rate of formless crystal Zn2Fe(PO4) 2·4H2O(marked P) crystals and the ratio of P/(P+H) (H was the mark of Zn3(PO4) 2 crystal) in the coating,combination of which with components parsing by EDS indicated that the sequence of contribution elements P and Zn to erosion resistance of coatings was P>Zn. And the correlative mechanism was discussed,which made it clear that owing to the particularity of the outer-shell electron structure and larger ionic radius,RE was so easy to be polarized and metamorphosed itself that it adsorbed lightly on the basic body to pose gels. They efficiently reduced the activation energy which was required for formation of a new solid phase of phosphates and made it also possible to engender effectively active nucleation regions of cathode and anode under low temperature phosphating condition,which was propitious to formation,densification and uniformization of the phosphate crystal nucleus and growth of the crystallite and coating buildup. Thus it could be seen that REN played the role of surface regulator and accelerant,which speeded up the phosphating,as well as bids amount of porosity of the coating fall to improve the corrosion resistance of the coating.

关键词： rare earths (RE) phosphate coating configuration analysis depolarization nucleation

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Study on Snake Venom Protein-Antibody Interaction by Surface Plasmon Resonance Spectroscopy

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Photonic Sensors 2018年第3期8卷 193-202页

作者： Subhankar N. CHOUDHURY Barlina KONWAR Simran KAUR Robin DOLEY Biplob MONDAL Department of Electronics and Communication Engineering Tezpur University Tezpur 784028 Assam India deptment of Molecular Biology and Biotechnology Tezpur University Tezpur 784028 Assam India

The development of a portable and inexpensive surface plasmon resonance （SPR） measurement device with the integrated biosensor for the detection of snake venom protein is presented in this paper. For the construction of the sensing element, amine coupling chemistry is used to bio-functionalize silver coated glass slide with antibodies like immunoglobulin （IgG）. The immobilization of the antibody is confirmed by spectroscopic measurements like ultraviolet-visible spectroscopy （UV-Vis） and Fourier-transforms infrared spectroscopy （FTIR）. The device is calibrated with the standard solution of sodium chloride and ethanol before testing venom protein samples. To investigate the bio-molecular interactions, crude venom of Indian cobra （concentration range： 0.1 mg/ml - 1.0mg/ml） in the phosphate buffer solution （PBS） are exposed to the biosensor. The experimentally measured data indicate the shift in the plasmon resonance angle from its initial value （52°） to 54° for 0.1 mg/ml and 60° for 1.0mg/ml protein solution.

关键词： Surface plasmon resonance biosensor venom protein

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二氮双环阳离子游离基中N，N′—三电子键

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有机化学 2001年第8期21卷 618-621页

作者：邓克俭韩世刚 Dieter Klapsteinc 中南民族学院化学系分析化学综合实验室西安交通大学化学化工学院 deptment of chemistry St. Francis Xavier University Antigonish N. S.

用从头算HF/3-21+G*优化了二氮双环[m,n,l]游离基阳离子(m,n,l≥2～5).分子[4,4,4]和[2,2,2]+,[3,3,3]+,[4,4,4]+游离基阳离子的优势构型有D3对称性,而其它游离基阳离子的优势构型为非对称性.通过比较这些阳离子几何构型,HOMO和NHOMO(即... 详细信息

用从头算HF/3-21+G*优化了二氮双环[m,n,l]游离基阳离子(m,n,l≥2～5).分子[4,4,4]和[2,2,2]+,[3,3,3]+,[4,4,4]+游离基阳离子的优势构型有D3对称性,而其它游离基阳离子的优势构型为非对称性.通过比较这些阳离子几何构型,HOMO和NHOMO(即Next HOMO和HOMO-1),和由MNDO计算确定的原子对作用能,表明当二氮双环游离基阳离子的桥链(CH2)n的n≥3时,桥头氮原子通过空间相互作用形成了一个弱的N,N＇-三电子σ-键.形成的三电子键强度不随环的扩大而增强.而三电子键强度被两个因素影响:一个是桥头氮原子间的p轨道重叠的取向;另一个是它们相应p轨道成分.

关键词：二氮双环游离基阳离子环张力效应从头算方法原子对作用能取代效应 N,N′-三电子键量子化学

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Chemical constituents from Trichosanthes cucumeroides

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Journal of Chinese Pharmaceutical Sciences 2020年第6期29卷 431-438页

作者： Jing Chen Li Cheng Fuqian Wang Xuanbin Wang Yonghui Zhang Xincai Hao deptment of Traditional Chinese Medicine Renmin HospitalHubei University of MedicineShiyan 442008China Hubei Key Laboratory of Natural Medicinal chemistry and Resource Evaluation School of PharmacyTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China Department of Pharmacy Wuhan First HospitalWuhan 430022China

One new triterpenoid, 3β-[(E)-caffeoyloxy]-D:C-friedooleana-7,9(11)-dien-29-oic acid(1) and nine known triterpenoids identified as cucurbitacin B(2), 23,24-dihydrocucurbitacin B(3), 23,24-dihydrocu-curbitacin D(4), cucurbitacin D(5), cucurbalsaminol A(6), 3-epi-isocucurbitacin D(7), curbitacin G(8), cucurbitacin J(9) and cucurbitacin I(10) were purified from Trichosanthes cucumeroides. Their structures were confirmed by spectroscopic data analysis and comparison with previous literature. All compounds were obtained from T. cucumeroides for the first time.

关键词： Trichosanthes cucumeroides Chemical constituents Triterpenoid Structural identification

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