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991.
Pil Kim Younghun Kim Taewook Kang In Kyu Song Jongheop Yi 《Catalysis Surveys from Asia》2007,11(1-2):49-58
Mesoporous materials have attracted considerable attention for use as a catalyst or a catalyst support due to their remarkable
textural properties such as high surface area and large pore volume with a narrow pore size distribution. Many efforts have
been made to design mesoporous materials for use in heterogeneous catalyst systems. Recent progress and results regarding
the preparation of nickel-mesoporous materials and their application to the hydrodechlorination of chlorinated organic compounds
were discussed in this review. Mesoporous materials were used as a support for nickel catalyst or a nickel-incorporated mesoporous
catalytic material in this work. Two research areas were described and discussed in this review. One is the preparation of
mesoporous alumina-supported nickel catalysts and their application to the hydrodechlorination of 1,2-dichloropropane and
o-dichlorobenzene. The other is the preparation of mesoporous silica-supported nickel catalysts and their application to the
hydrodechlorination of 1,1,2-trichloroethane and chlorobenzene. 相似文献
992.
[reaction--see text] A stereoselective synthesis of the C(16)-C(28) fragment of the apoptosis inducing agent apoptolidin is described. Key steps include two propionate aldol reactions and a stereoselective Mukaiyama aldol addition of enolsilane 19 to beta-methoxy aldehyde 4. 相似文献
993.
Electrophoretic characterization of a novel cysteine protease produced by pathogenic luminous Vibrio harveyi, originally isolated from diseased tiger prawn Penaeus monodon in Taiwan, is demonstrated in the present study using native polyacrylamide gel electrophoresis (native PAGE), sodium dodecyl sulfate-PAGE (SDS-PAGE), crossed immunoelectrophoresis (CIE) and isoelectric focusing (IEF) gels. The protease has a pI of 6.4 and exhibits a fast-migrating feature in native-PAGE and CIE gels indicating that it is a negatively charged protease. The protease electrophoresed as a 22 kDa protein band in native- and SDS-PAGE (in SDS - buffer with or without the presence of 2-mercaptoethanol) while it electrophoresed as a 38 kDa protein band in SDS-PAGE when the samples were boiled for 10 min prior to electrophoresis. The results reveal that the enzyme is an SDS-resistant monomeric protease and its high negative charge is not influenced by SDS (detergent) without boiling the sample. The present results are useful in determining proteins of similar nature to this unique cysteine protease. 相似文献
994.
A series of new complexes {2,6-bis[1-((2-methyl-4-methoxyphenyl)imino)ethyl]pyridine}Cl2 [M=Fe(II) (2), Co(II) (3), Ni(II) (4), Cu(II) (5), Zn(II) (6)] have been synthesized. At 25°C, using 500 equiv of methylaluminoxane (MAO), the activities of Fe(II), Co(II) catalysts can reach 4.02 ×106 g/mol-Fehatm for ethylene polymerization and 3.98×105 g/mol-Cohatm for ethylene oligomerization. The effects of polymerization conditions such as reaction temperature, Al/M molar ratio and time on the activity of catalyst have been explored. 相似文献
995.
T. J. Lee 《Periodica Mathematica Hungarica》1991,23(2):121-127
It is proved that a dendroidX is not of typeN if and only if for each arc ofX, the intersection of all its bend sets is nonempty. 相似文献
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