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R-PHYCOERYTHRIN FROM Porphyra yezoensis UEDA AND ITS PRELIMINARY CRYSTALLOGRAPHY STUDY

Science China Chemistry 1992年第1期35卷 58-66页

作者：梁丽竺迺珏 Institute of Biophysics Academia Sinica Beijing 100080 PRC Institute of Chemistry Academia Sinica Beijing 100080 PRC

Native R-phycoerythrin from Porphyra yezoensis has a molecular weight of 230, 000±23,000 dalton in 0.05 mol/L potassium phosphate at pH 7.5 and an absorption spectrum with the maxima at 565 and 498 nm and a shoulder at 540 nm, Its fluorescence emission maximum is at 578 nm in the above buffer. Single crystal X-ray diffraction investigation is in progress from R-phycoerythrin. It is crystallized in the rhombohedral space group R_3 with a=b=187.5±2.5, c=60.0±3,0. The densities measured on the crystals and its mother liquor are 1.215 g/cm^3 and 1.070 g/cm^3 respectively. The fraction of the crystal volume occupied by the protein is 51.5%.It has been estimated that the ctystallographic asymmetric unit in rhombohedral lattice might contain (αβ)_2 with a total molecular mass of less than 8×10~4 dalton. The hexagonal unit cell could accommodate three cylindrical molecules 108 in diameter and 60 in height, which is dictated by the space group symmetry for packing into the unit cell.

关键词： phycobtliprotein crystal structure composition of oligomer.

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2-AMINOMETHYLPYRIDINE NICKEL(Ⅱ) COMPLEXES—SYNTHESIS,MOLECULAR STRUCTURE AND CATALYSIS OF ETHYLENE POLYMERIZATION

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Chinese Journal of Polymer Science 2008年第5期26卷 567-573页

作者：伍青 Institute of Polymer Science School of Chemistry and Chemical EngineeringSun Yat-Sen(Zhongshan)UniversityGuangzhou 510275China

A series of new nickel(Ⅱ)complexes with 2-aminomethylpyridine ligands,(2-PyCH_2NHAr)_2NiBr_2(Ar=2,6- dimethylphenyl 2a;2,6-diisopropylphenyl 2b,2,6-difluorophenyl 2c),have been synthesized and used as catalyst precursors for ethylene polymerization in the presence of methylaluminoxane(MAO).The catalysts containing ortho-alkyl-substituents afford high molecular weight branched polyethylenes as well as a certain amount of *** the steric bulk of the alkyl substituent of the catalyst resulted in...

关键词： 2-Aminomethyipyridine Nickel(Ⅱ)complex Catalyst Ethylene polymerization oligomer.

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Impact of Modification Process on Graphite Structure at Application of Chloroperfluorododecylfluoro Sulfate

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Journal of Chemistry and Chemical Engineering 2015年第7期9卷 454-458页

作者： Marina Gurgenishvli Givi Papava Vitali Sherozia Ia Chitrekashvili Rusudan Tsiskarishvili Irma Jinikashvili Petre Melikishvili Institute of Physical and Organic Chemistry lvane Javakhishvili Tbilisi State University Tbilisi O179 Georgia

Impact of the process of modification on graphite structure at the application of fluorine-containing oligomer.FDS （chloroperfluorododecylfluoro sulfate） has been studied. It was shown that during this process graphite structure does not change. Only particles of FDS are destructed into monolayers, which are spread in graphite intercrystalline voids. At the mechanical impact it protects graphite from destruction and correspondingly, improveing some of its tribotechnical characteristics.

关键词： Grafit modification diffractometer FDS oligomer.

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