Application of chromium catalysis technology to compound-specific hydrogen isotope analysis of natural gas samples.

An easy-to-use and efficient approach for the catalytic pyrolysis of hydrocarbon gas here is proposed and tested, which allowed the precise measurement of δH. This method requires the reaction tube filled with twisted chromium wire, establishing a gas chromatography-Chromium wire/high temperature conversion-isotope ratio mass spectrometer (GC‒Cr/HTC‒IRMS) system. The approach described here has many remarkable advantages over other techniques.

An ultra-sensitive selective fluorescent sensor based on a 3D zinc-tetracarboxylic framework for the detection and enrichment of trace Cu in aqueous media.

Herein, a novel and fluorescent zinc-organic framework sensor [Zn(μ-Hbptc)(μ-4,4'-bpy)(HO)]·2nHO (1) (Hbptc = 2,3,3',4'-biphenyl tetracarboxylic acid, 4,4'-bpy = 4,4'-bipyridine) is synthesized and characterized, demonstrating its excellent fluorescence performance for Cu detection and the enrichment of Cu in aqueous media. The fluorescence intensity of 1 can be selectively quenched by Cu in a linear range of Cu concentrations of 0-0.7 μM.

Integrated assessment of coastal ecological security based on land use change and ecosystem services in the Jiaozhou Bay, Shandong Peninsula, China.

Land use-based development activities can change the quality of coastal environment and the supply pattern of ecosystem services, negatively affecting the ecological security of coastal zones. Coastal ecosystem research has generally used terrestrial ecosystem research models which cannot actually reflect the features of the coastal zone─An independent environmental system combining land and sea. A scientific explanation is lacking for the complex relationship among driving factor of land-based activities, the response of ecosystem services, and the realization of ecological security in the coastal zone.

[Molecular and Carbon Isotopic Compositions of -Alkanoic Acids in Smoke from Maize Straw Combustion].

Four cultivars of maize straw were burned under flaming and smoldering conditions. Smoke samples were colleted and analyzed by GC/MS and GC/C/IRMS to determine molecular and stable carbon isotopic compositions of -alkanoic acids in them. The results showed that -alkanoic acids in flaming smoke were composed of C to C, with a mean total content of 13895.

Natural Products on Nonalcoholic Fatty Liver Disease.

Non-alcoholic fatty liver disease (NAFLD) is a chronic disorder of lipid and carbohydrate metabolism and is often associated with endoplasmic reticulum stress, energy homeostasis dysregulation, and inflammation at cellular and molecular levels. Use of currently available anti-hyperlipidemia, hypoglycemia, or anti-inflammation drugs to treat NAFLD has not achieved desirable outcomes. A growing attention thus has been paid towards natural products as an alternative means in treating NALFD.

Recent insights into farnesoid X receptor in non-alcoholic fatty liver disease.

Non-alcoholic fatty liver disease (NAFLD) is the hepatic manifestation of metabolic syndrome and is one of the most prevalent liver disorders worldwide. NAFLD can gradually progress to liver inflammation, fibrosis, cirrhosis and even hepatocellular carcinoma. However, the pathogenesis of NAFLD is complex, and no efficient pharmaceutic treatments have yet been established for NAFLD.

[An analysis of subhealth status based on partial least squares].

Objective: To explore the discrimination model of subhealth with statistical method of partial least squares (PLS).

Methods: This study was based on the Subhealth State Rating Scale (SHSRS). A total of 88 subhealth subjects (scoring less than 85 in SHSRS) and 64 healthy people (scoring over 85 in SHSRS) were enrolled randomly.

Fluorescence study on the interaction of human serum albumin with bromsulphalein.

The binding of bromsulphalein (BSP) with human serum albumin was investigated at different temperatures, 298 and 308 K, by the fluorescence spectroscopy at pH 7.24. The binding constant was determined by Stern-Volmer equation based on the quenching of the fluorescence HSA in the presence of bromsulphalein.