Lollingite (FeAs) is considered an arsenic-bearing mineral that is oxidized faster than arsenopyrite. The geometric configuration, chemical valence bond, and microscopic reaction of the oxidation on the surface of lollingite were systematically studied, which are of great significance for understanding the mechanism of oxidative dissolution. X-ray photoelectron spectroscopy (XPS) measurements and density functional theory (DFT) calculations were carried out to characterize the (101) surface oxidation process of lollingite under the O/O + HO conditions.
View Article and Find Full Text PDFThe proper treatment of lollingite is of great significance due to its rapid oxidation leading to release of arsenic into the environment. Herein, a green multi-solid waste geopolymer, consisting of red mud, metakaolin, blast furnace slag, and flue gas desulfurization gypsum, was developed. The obtained red mud-metakaolin-based (RMM) geopolymer demonstrated good arsenic retention capability.
View Article and Find Full Text PDFWilliams-Beuren syndrome (WBS) is a rare genetic syndrome with a characteristic "elfin" facial gestalt. The "elfin" facial characteristics include a broad forehead, periorbital puffiness, flat nasal bridge, short upturned nose, wide mouth, thick lips, and pointed chin. Recently, deep convolutional neural networks (CNNs) have been successfully applied to facial recognition for diagnosing genetic syndromes.
View Article and Find Full Text PDFThe objective of this study was to evaluate the antitumor activity of chelerythrine chloride (CHE) and investigate its potential apoptotic induction mechanism in SMMC-7721 cells. Our results suggested that the proliferation of SMMC-7721 cells was inhibited by CHE in a time and dose dependent manner, with a significant accumulation in S phase, and the cells exhibited typical apoptotic features. Moreover, CHE remarkably induced apoptosis by disruption of the mitochondrial membrane potential, release of Cyt-c, activation of caspase-3, and cleavage of poly-ADP-ribose polymerase in a dose dependent manner.
View Article and Find Full Text PDFJ Asian Nat Prod Res
September 2008
During the study of anti-HIV-1 active components of the aqueous extracts of the roots of Salvia yunnanensis, three new derivatives of polyphenols, namely: methyl salvianolate A (2), ethyl salvianolate A (3) and cis-lithospermic acid (5) were isolated along with two known polyphenols, salvianolic acid A (1) and lithospermic acid (4) their structures were elucidated on the basis of NMR and MS spectral analyses. The anti-HIV-1 activities of the 5 polyphenols were tested for the inhibition of P24 antigen in HIV-1 infected MT-4 cell cultures and HIV-1 replicative enzymes in vitro.
View Article and Find Full Text PDFA new polyphenol, designated as salvianolic acid N, was isolated from the aqueous extracts of the roots of Salvia yunnanensis. Its chemical structure was elucidated as 3-(3,4-dihydroxylphenyl)-2-[(E)-3-(1,8,9-trihydroxyl-dibenzo[b,f]oxpin-3-yl)acryloxloxy]propanoic acid (1) on the basis of NMR and MS spectral analyses. The new polyphenol inhibited both HIV-1 IN in vitro and also reduced HIV-1 p24 antigen in MT-4 cell lines.
View Article and Find Full Text PDFZhongguo Zhong Yao Za Zhi
September 2007
Objective: To study the chemical constituents in the root of Salvia yunnansis.
Method: Compounds were isolated and purified by Diaion HP20, Sephadex LH - 20, ODS chromatography. Their structures were determined by spectral analysis and chemical evidence.
Zhongguo Zhong Yao Za Zhi
March 2004
Objective: To isolate and identify the chemical constitutents in roots of Jasminum sambac.
Method: The compounds were isolated by means of chromatography and the structures were identified on the basis of physical and spectral data.
Result: Dotriacontanoic acid, dotriacontanol, oleanolic acid, daucosterol and hesperidin were elucidated.