نتایج جستجو برای: c21
تعداد نتایج: 717 فیلتر نتایج به سال:
Two monomeric dihydrodiol dehydrogenases with pI values of 5.4 and 7.6 were co-purified with androsterone dehydrogenase activity to homogeneity from human liver. The two enzymes differed from each other on peptide mapping and in their heat-stabilities; with respect to the latter the dihydrodiol dehydrogenase and 3 alpha-hydroxysteroid dehydrogenase activities of the respective enzymes were simi...
As a part of our continuing research for bioactive constituents from Cynanchum plants, four new C21 steroidal glycosides, cynapanoside D-G (1-4), together with six known compounds (5-10) were isolated from the roots of Cynanchum paniculatum (Bge.) Kitag. Their structures were elucidated on the basis of 1D- and 2D-NMR spectroscopic data as well as HR-ESI-MS analysis. Compound 8 exhibited potent ...
Phytochemical screening of Caralluma lasiantha was carried out and one C21 pregnane steroid was isolated from chloroform extract. Based on spectroscopic studies (IR, 1H NMR, 13C NMR and ESI-MS) the isolated compound is 3b,14b-dihydroxy-14b-pregn-5-en-20-one which was earlier isolated from other species.
pyrrolo[3,4-c]pyrrole-1,4-dione can be applicable as useful pigments. One of them, 3,6-bis(4-chlorophenyl)pyrrolo[3,4c]pyrrole-1,4-dione, is now on the market. Several structural studies have been undertaken on compounds consisting of this choromophore system.1 Most of them have aromatic substituents at the 3 positions of the chromophore and no large substituents at the nitrogen atom. In order ...
This appendix includes material supplementing the manuscript “Survey mode effects on income inequality measurement.” It includes background information in Section 1, an extended description of the methods used in Section 2 as well as robustness checks and additional results in Section 3. JEL Classification: C14, C21, C81, C83, D31
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