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Qian Rong LI* Ting Hu ZHANG Robert S.WARD Structure Research Laboratory University of Science Technology of China Hefei Chemistry Department University of Wales Swansea Singleton Park Swansea SA PP UK 《中国化学快报》2001,(12)
Introduction 2, 3-Dichloro-5, 6-dicyanobenzoquinone (DDQ) can react with lignans of the mono- arylidene-butyrolactone1, aryltetralin2, dibenzylbutane3 and aryltetralin-butyrolactone4,5 series. We have studied the reactions of this reagent with podophyllotoxin 1, which is a well-known natural product on account of its long history of use in folk medicine and the biological activity of its many derivatives6. In particular, derivatives of 4-demethyl epipodophyllotoxin are used in cancer chemo… 相似文献
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Giorgio Dall'aglio 《Milan Journal of Mathematics》1988,58(1):239-250
Dopo aver ricordato che una distribuzione di probabilità si dice decomponibile se si può ottenere come convoluzione di due
altre distribuzioni, vengono citati i risultati classici più importanti relativi alla decomponibilità (distribuzioni infinitamente
decomponibili; chiusura, rispetto alla decomposizione, delle famiglie normale, binomiale, e di Poisson).
Viene poi trattato il problema della decomposizione delle distribuzioni uniformi discrete, identificando le componenti ?prime?;
e di quelle continue, mostrando che ogni componente soddisfacente una certa condizione ha a sua volta una componente uniforme
discreta. 相似文献
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Baldini M Belicchi-Ferrari M Bisceglie F Dall'aglio PP Pelosi G Pinelli S Tarasconi P 《Inorganic chemistry》2004,43(22):7170-7179
New alpha-ketoglutaric acid thiosemicarbazone (H(3)ct) derivatives and their copper complexes were synthesized and characterized by analytical and spectroscopic (IR and NMR) methods. For two of the ligands, Me-H(3)ct and Allyl-H(3)ct, and for a complex, [Cu(Me-Hct)(OH(2))](n) x 2nH(2)O, the X-ray structures were also determined. In the latter the copper atom shows a 4 + 1 pyramidal coordination, a water oxygen appears in the apical position, and three of the basal positions are occupied by the SNO tridentate ligand and the fourth by a carboxylic oxygen of an adjacent molecule that gives rise to a polymeric chain. DNA binding constants were determined, and studies of thermal denaturation profiles and nuclease activity were also performed. Tests in vitro on human leukemia cell line U937 were carried out on cell growth inhibition, cell cycle, and apoptosis induction. 相似文献
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