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Two new (1–2) and three known (3–5) C21 steroidal glycosides were isolated from Cynanchum stauntonii. Their structures were elucidated on the basis of 1D and 2D-NMR spectroscopic data as well as HRTOFMS analysis. The cytotoxicity of the compounds against A549, HepG2, and 4T1 cell lines were evaluated by MTT assay. Compound 4 exhibited good inhibitory activities with the IC50 values 26.82, 12.24, and...
The dechlorination test of modified calcium-based sorbent and that of unmodified calcium-based sorbent were compared in a small-scale dual-layer granular bed filter in order to investigate the calcium utilization and dechlorination efficiency. The results showed that the activity of modified calcium-based dechlorinating agent hydrate was greatly increased. When Ca/Cl=2.5, the dechlorination efficiency...
In order to improve the Hg0 removal efficiency and utilization of powdered activated carbon (PAC) of the traditional mercury removal technology which applies activated carbon injection based on a bag filter, a new mercury removal technology with pure PAC on a bag filter was put forward in the present study. Mercury removal experiments were conducted on a small-scale bag filter test bed with pure PAC...
There are wide backgrounds of applications of a thin elastic rod. For an exact model of a Cosserat elastic rod which are not only bending and torsion but also shearable and extensible, constitutive relation for principal vector and principal moment on a cross section versus displacements of the section with arc coordinate are derived from Hooke's low. It shows that derivative of generalized coordinates...
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