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5,6-Dihydro-OSW-1 (1) was synthesized following our previous procedure for the total synthesis of OSW-1. This compound demonstrated slightly stronger potency than that of OSW-1 against the growth of cancer cells. 相似文献
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IntroductionElectrontransferreactionsarethekeystepsinphoto synthesis ,respirationandmanyotherbiochemicalprocess es.1Cytochromeb5isaredoxproteinexistingwidelyinnature ,whichactsasanelectron carrierduringvariouselectrontransferprocessesinthebiologicalsystem .2Cytochromeb5isamembraneproteinwithmolecularweightofapproximately 16kDa ,ofwhichthehydrophobicC terminaldomainanchorscytochromeb5tothemem brane ,andthehydrophilicN terminaldomaincontainshemeprostheticgroupandexhibitsthebiologicalfunctionsof… 相似文献
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毛细管气相色谱法测定果蔬中α—萘乙酸残留量 总被引:2,自引:0,他引:2
用530μm大口径毛细管柱为分离柱,GC-FID法测定水果和蔬菜中的α一萘乙酸残留量。方法检测限为10~(-7),回收率和相对标准偏差分别为99.5%和3.0%。 相似文献
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YU Biao HUI Yong-ZhengState Key Laboratory of Bio-organic Natural Products Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai China 《中国化学》1996,14(2):171-179
Three types of single-chain hydrocarbon fluorocarbon hybrid bolaamphiphiles were synthesized.They readily formed different kinds of organized supramolecular assemblies,including vesicles,tapes,and micellar fibers,in aqueous solution.The aggregates morphology was characterized by transmission electron microscopy (TEM) after negative staining.The superstructures of these aggregates seemed to be determined by the geometry and the head group's properties of the corresponding amphiphiles. 相似文献
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Study on Tonghaosu and Its Analogs: Isolation, Structure Identification and Synthesis of Antifeedant B-ring-homo-tonghaosu 总被引:1,自引:0,他引:1
The methanolic extract from a Chinese endemic Chrysanthemum plant, Dendranthema indicum var. aromaticum, was found to show high antifeeding activity against Pieris brassicae L., and by bioassay-guided separation, the active component, B-ring-homo-tonghaosu, 2-(2‘,4‘-hexadiynylidene)-1,6-dioxaspiro-[4,5]-dec-3-ene (2) was isolated. Its structure was elucidated by comparing its spectroscopic data with those of 2 reported in the literatures. Furthermore new convenient total synthesis methods of B-ring-homo-tonghaosu were also developed to confirm its structure and make its further application in crop protection available. In addition, extensive comparison of spectroscopic data showed that the structure of compound 21 reported in literature should be revised to 2. 相似文献
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IntroductionInthepasttwodecades ,alargefamilyofnaturalproductsnamedannonaceousacetogeninswereisolatedandcharacterizedbytheglobalresearchersfromvariousspeciesoftheplantannonaeae .1Amongover 4 0 0mem bers,mostofthemwerefoundtoshowpotentcytotoxicandantitumora… 相似文献
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<正>Two new eudesmane derivatives were isolated from the leaves and flowers of Verbesina virginica,along with the known 6-O-β-E -p-coumaroyl-4α-hydroxyeudesmane(1).Their structures were determined as 6-O-β-Z-p-coumaroyl-4α-hydroxyeudesmane(2) and 6-O-α-E-p-coumaroyl-1β-4α-dihydroxyeudesmane(3) by spectroscopic methods. 相似文献