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In vitro bioactivity and phytochemical screening of Suaeda maritima(Dumort):A mangrove associate from Bhitarkanika,India

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Asian Pacific Journal of Tropical Medicine 2011年第9期4卷 727-734页

作者： jk Patra NK Dhal hn Thatoi Department of Biotechnology North Orissa UniversityBaripada-757003OdishaIndia Department of Natural Products Institute of Minerals and Materials TechnologyBhubaneswar-751013OdishaIndia Department of Biotechnology College of Engineering and Technology(Bijn Patnaik University of Technology)Bhubaneswar-751003OdishaIndia

Objective:To investigate the in vitro antioxidant and antimicrobial activities along with phytochemical screening of organic and aqueous extracts of leaf and stem of Suaeda maritima (Dumort).a mangrove associate from Bhitarkanika of ***:Antioxidant activity of the crode extracts was evaluated in terms of total antioxidant capacity,total phenol content,ascorbic acid content,DPPH radical scavenging,metal chelating,nitric oxide scavenging,and reducing power *** antimicrobial activity of the plant was determined by agar well diffusion method along with MIC and BBC carried out by microdilulion techniques against 10 gram positive and gram negative human pathogenic *** qualitative and qualitative phytochemical screening were carried out by standard biochemical ***: Out of the seven antioxidant bioassavs,both the leaf and stem extracts were found to posses strong antioxidant properties of 70%to 92%for phenol,total antioxidant capacity,DPPH free radical scavenging aclivitv and fairly good ascorbic acid content,metal chelating(1.33%-22.55%). reducing power(0.01-0.12) and nitric oxide scavenging(0.84%-66.99%) *** of the four extracts evaluated for antimicrobial activity,two leaf extracts such as acetone and ethanol showed promising activity against four pathogenic bacteria and one stem methanol extracts against one pathogenic bacteria when compared with amoxcycillin as *** MIC and MBC values of the antimicrobial extracts ranged between 2.5 to 5.0 mg/*** of phytochemicals showed presence of carbohydrates,protein,tannins,alkaloids and flavonoids in comparatively higher amount than other phytochemicals ***:The present study reveals the presence of potential antioxidants and antimicrobial properties in the plant extract which could be exploited for pharmaceutical application.

关键词： Mangrove plants Suaeda maritima Antioxidant Antimicrobial Phytochemicals

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Exploration of chromene-based BioAIEgens

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National Science Review 2024年第3期11卷 47-48页

作者： Fritz E.Kühn Department of Chemistry&Catalysis Research Center School of Natural Sciences Technical University of Munich

Photoemission efficiency is usually higher in solution than in solid *** compounds however, display a reverse behavior. Such a behavior is called aggregation-induced emission(AIE).

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Strong coupling,charm- and bottom-quark masses from electron-positron annihilation

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Chinese Physics C 2010年第6期34卷 675-679页

作者： J.H.Kühn Institut für Theoretische Teilchenphysik Karlsruhe Institute of Technology

The cross section for electron-positron annihilation into hadrons allows for a precise determination of the strong coupling constant and the charm- and bottom-quark masses. Recent theoretical and experimental results ... 详细信息

关键词： strong coupling quark masses

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Seismic Response Reduction for Fixed Offshore Platform by Tuned Liquid Damper

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China Ocean Engineering 1997年第2期12卷 119-125页

作者： Li, hn Ma, BC Shenyang Architectural and Civil Engineering Institute Shenyang 110015 China

An approach to seismic response reduction for offshore platforms by the use of the tuned liquid damper is presented in this paper. First of all, the effects of the tuned frequency ratio and excited frequency ratio on the seismic response reduction of the platform structure are investigated. Based on the results, a mechanical model and equation of motion for the TLD-platform system are established. And then effectiveness of the appraoch is verified by numerical calculation.

关键词： fixed offshore platform tuned liquid damper vibration reduction

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A NEW RAPID FLUOROMETRIC METHOD FOR DETERMINATION OF SULFONAMIDES

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Chinese Chemical Letters 1995年第6期6卷 495-496页

作者： Li, hn Ci, YX Peking Univ Dept Chem Beijing 100871 Peoples R China

A new fluorometric method for the determination of sulfonamides is described, based on the formation of a fluorescent inclusion complex of carbonic anhydrase(CA) with dansylamide (DNSA). The fluorescence maximum emission of the complex is at 460nm with excitation at 280nm. Dissociation constants were determined for the CA-sulfonamide complexes. Limits of detection for DNSA,sulfanilamide(SAN) and p-toluenesulfonamide (PTSN) were 0.84, 19.5 and 6.1 ng/ml, respectively. The recommended method, was applied. to the determination of sulfonamides in cow milk at ng/ml level.

关键词： RAPID

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Bio-inspired tetracarbene compounds as a new family of energy saving catalysts

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Journal of Energy Chemistry 2023年第4期79卷 559-561页

作者： Bo Zhang Fritz E.Kühn CAS Key Laboratory of Science and Technology on Applied Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina' University of Chinese Academy of Science Beijing 100049China Molecular Catalysis Catalysis Research Center and Department of ChemistrySchool of Natural SciencesTechnical University of MunichLichtenbergstr 485748 Garching bei MünchenGermany

Efficient use of energy is a pressing *** of chemical processes is currently an important target for energy *** chemical processes are independent of pathways with respect to the final energy output or consumption,the application of catalysts can reduce involved activation energies considerably and therefore save large amounts of energy.

关键词： Catalysis Iron Carbenes Multidentate ligands

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Organorhenium(Ⅶ) oxides

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Rare Metals 2006年第z1期25卷 411-421页

作者： Kühn Fritz E. JAIN Kavita R. Department für Chemie der Technischen Universitt München Lichtenbergstrasse 4 D-85747 Garching bei München Germany

Methyltrioxorhenium (MTO) and its derivatives were utilized as catalysts for a broad variety of organic reactions after the discovery of an easy synthetic access way to this class of compounds. Among the numerous characterization techniques, 17O-NMR spectroscopy and vibrational spectroscopy were exemplary discussed. The immobilization of MTO and its derivatives is of significant current interest as is the synthesis of chiral derivatives.

关键词： catalysis epoxidation immobilization olefination rhenium

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Rheology Study of Suspension Formed by Different Nano-size Y-TZP

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Journal of Materials Science & Technology 1997年第4期13卷 348-350页

作者： Sun, J Gao, LA Guo, jk CHINESE ACAD SCI SHANGHAI INST CERAMSHANGHAI 200050PEOPLES R CHINA

The rheological properties of slurries formed by different nano-size Y-TZP have been studied. The viscosity is sensitive to solid loading especially for high solid content level. The dispersant NH(4)PAA can improve the flowability efficiently. The smaller ceramic particles need to adsorb more dispersant to the flowability. Under the same solid content, the smaller the particles, the higher the viscosity of its slurry.

关键词： Rheology

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Differential areas for differential stations (DADS): A new method of establishing grid ionospheric model

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Chinese Science Bulletin 2002年第12期47卷 1033-1036页

作者： Yuan, YB Ou, jk Chinese Acad Sci Inst Geodesy & Geophys Lab Dynam Geodesy Wuhan 430077 Peoples R China

Differential Area for Differential Stations (DADS), a new method of establishing grid ionospheric model, is presented. The preliminary results show that it is possible to establish a real time large range high precision grid ionospheric model (GIM) using the DADS and the GPS data of the Chinese crust movement observation network (CCMON).

关键词： GPS grid ionospheric model crust movement observa-tion network DADS.

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Hydromechanical behaviors of andesite under different stress states during fluid injection

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第4期13卷 727-744页

作者： Miao He Qi Li Xiaying Li Liang Xu Michael Kühn State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China Fluid Systems Modelling Section GFZ German Research Centre for GeosciencesPotsdamGermany Institute of Earth and Environmental Science University of PotsdamPotsdamGermany

Water reinjection into the formation is an indispensable operation in many energy engineering *** operation involves a complex hydromechanical(HM)coupling process and sometimes even causes unpredictable disasters,such as induced *** is acknowledged that the relative magnitude and direction of the principal stresses significantly influence the HM behaviors of rocks during ***,due to the limitations of current testing techniques,it is still difficult to comprehensively conduct laboratory injection tests under various stress conditions,such as in triaxial extension stress *** this end,a numerical study of HM changes in rocks during injection under different stress states is *** this model,the saturated rock is first loaded to the target stress state under drainage conditions,and then the stress state is maintained and water is injected from the top to simulate the formation injection *** attention is given to the difference in HM changes under triaxial compression and extension *** includes the differences in the pore pressure propagation,mean effective stress,volumetric strain,and stress-induced *** numerical results demonstrate that the differential stress will significantly affect the HM behaviors of rocks,but the degree of influence is different under the two triaxial stress *** HM changes caused by the triaxial compression stress states are generally greater than those of extension,but the differences decrease with increasing differential stress,indicating that the increase in the differential stress will weaken the impact of the stress state on the HM *** addition,the shear failure potential of fracture planes with various inclination angles is analyzed and summarized under different stress *** is recommended that engineers could design suitable injection schemes according to different tectonic stress fields versus fault occurrence to reduce the risk of

关键词： Water reinjection Stress state Hydromechanical(HM)coupling Injection-induced seismicity Numerical modeling

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