Peduncin, A New Indole Alkaloid from Pueraria peduncualris

Pueraria peduncularis (Grah. ex Benth.) Benth. is a plant of Leguminosae which grows in the southwest of China. Different from other plants of Pueraria, it could not be used as a medicine due to its toxicity1. In order to use the Pueraria plants safer, we studied the constituents of P. peduncularis. Previous phytochemical studies of an n-BuOH extract afforded three triterpenoid saponins2-3. The continuing investigation on CHCl3 extract led to the isolation of a new indole alkaloid. …     

Synthesis and DNA Cleavage Studies of 2,6-Dimethoxyhydroquinone-3-Mercaptoacetic Acid Conjugates

In previous paper and work, we reported the synthesis and cytotoxicity studies of a novel series of short chain peptide conjugates of the cytotoxic agent 2, 6-dimethoxyhydro -quinone-3-mercaptoacetic acid1 (DMQ-MA). The DMQ-MA is a derivative of 2,6-dimethoxybenzoquinone, which is a natural product of fermented wheat germ and found to have a wide spectrum of cytotoxicity against various tumor cell lines under the synergistic activation of L-ascorbic acid (AH2)2,3. Compared with DMQ, DMQ…     

Bioinformatics Assisted Gene Discovery and Annotation of Human Genome

IntroductionBioinformatics is coming with Human GenomeProject(HGP) . With the explosions of sequence,structural and other information available ,bioinformatics is playing an increasingly large rolein the study of fundamental biomedical problems.At present and in the near future,it is the mainchallenge for bioinformatists to make gene dicoveryand annotation of human genome sequences whenthe vast amount of data is produced by the highthroughput genome sequencing in a large scale andautomated m…     

Surface Activities of Calix[4] resorcinarenes Bearing Four Hydrophobic Chains and Its Sol ubilization for Organic Compounds

ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｃｌｕｓｉｏｎｃｏｍｐｏｕｎｄｓｈａｖｅｂｅｅｎｎｏｔｅｄｉｎｒｅｃｅｎｔｙｅａｒｓａｎｄｒｅｓｏｒｃｉｎｏｌ ｔｙｐｅｃａｌｉｘ [4 ]ａｒｅｎｅｈａｓｂｅｅｎｓｔｕｄｉｅｄｆｏｒｔｈｅｉｒｉｎｃｌｕｓｉｏｎａｂｉｌｉｔｉｅｓｂｙＳｃｈｅｉｄｅｒａｎｄＢｕｇｌｅｒｅｔａｌ[1— 3] .Ｔｈｅｐｏｌｙｏｌｍｏｉｅｔｉｅｓｉｎｃａｌｉｘ[4 ]ｒｅ ｓｏｒｃｉｎａｒｅｎｅｆｏｒｍｒｉｇｉｄｈｙｄｒｏｇｅｎ ｂｏｎｄｉｎｇｎｅｔｗｏｒｋｓ[4 ] ,ａｎｄｃａｌｉｘ [4 ]ｒｅｓｏｒｃｉｎａｒｅ…     

A New Organo-templated Layered Zincophosphate Synthesized from a Solvothermal System Containing Racemic1,2-Diaminopropane

IntroductionSince Wilson and co- workers successfullysynthesized three- dimensional microporousaluminophosphates (Al PO4 - n ) [1] in the 1 980 s,much attention has been focused on the explorationof1 - D chain,2 - D layer and3 - D open- frameworkmetal phosphates from aqueous or non- aqueoussystems.The number of metals incorporated intothe frameworks of these materials is continuouslyincreasing and the metals include Be[2 ] ,Ga[3] ,In[4 ] ,Sn[5] ,Sb[6 ] ,and the transition metals Zn[7] ,Ni…     

Determination the Hydrogen Stored in Carbon Nanotubes by NO Titration Method

With the diminution of fossil fuel resources and the increase in pollution, energy and environment have become a public concern. Mankind is in need of a new but clean energy resource. The use of hydrogen appears to be the answer. One of the technical challenges in hydrogen utilization is H2-storage. At present, materials for storing hydrogen are alloys such as LaNi5 and FeTi; the storage capacity is around 1.4 wt%, too low for practical application. Another problem with these alloys is…     

Ethylene Oligomerization by (dppe)MCl_2 [M = Fe(II), Co(II),Ni(II)] Complexes/EAO

Transition-metal-catalyzed oligomerzation of ethylene is an important process to provide a-olefins in the C6~C20 range. In recent years, the catalytic behavior of late transition metal complexes containing bi- and tri-dentate ligands for oligomerization of ethylene to a-olefins has attracted much attention. When oligomerization of ethylene catalyzed by nickel diimine and Fe(II), Co(II) 2,6-bis(imino)pyridine catalysts, the oligomers with high average molecular weight were obtained1-5. Eth…     

Novel Silicon Nanotubes

The preparation of silicon nanotubes is a subject of great importance for both the theoretical and experimental work in the nanotube research field since it could lead to a wealth of new physics and chemistry because of the unique properties of silicon as compared with its carbon analogue. Some structures of nanoscale silicon and silicon composites, such as silicon nanowire1, silicon nano-clusters2 and SiC nanorods3 have been discovered and investigated. The silicon nanotubes, however, have …     

Catalytic Film and Selective Oxidation of Iso-butylene

Selective oxidation is an important unit process in petrochemistry and fine chemical industry. As a thermodynamically profitable reaction, selective oxidation of hydro- carbons usually takes place with a lot of side-reactions and a great deal of reaction heat at high temperature. To prevent the side-reactions and accelerate heat exchanges are two principal aims in catalytic oxidation1. Using the catalytic film not only can remove the target products from the reaction area in time, but also avo…     

A New Method for Determination of Adsorption and Desorption Coefficients of Pesticides with Soil Column Liquid Chromatography

Agricultural chemicals such as pesticides were extensively applied in the fields. Pesticides effectively protect the crops, only as long as they remain in the root zone of soil. In case a portion of the chemicals leaves root zone and especially leaches through soil pores. They may pollute groundwater and be a serious environmental problem1. This problem has got widespread concern in the world. In soils the fate of organic compounds such as pesticides is governed by hydraulic transport coupled…