Molecular characteristics, sources and influencing factors of isoprene and monoterpenes secondary organic aerosol tracers in the marine atmosphere over the Arctic Ocean.

Biogenic secondary organic aerosols (BSOA) are important components of the remote marine atmosphere. However, the response of BSOA changes to sea ice reduction over the Arctic Ocean remains unclear. Here we investigated isoprene and monoterpenes secondary organic aerosol (SOAI and SOAM) tracers in three years of summer aerosol samples collected from the Arctic Ocean atmosphere.

Photocatalytic Degradation of Deoxynivalenol Using Cerium Doped Titanium Dioxide under Ultraviolet Light Irradiation.

Deoxynivalenol (DON) is a major mycotoxin with high toxicity that often contaminates grains, foods and feeds. The traditional approaches for DON removal are difficult to meet industry and agriculture demands due to the high stability of the DON molecule. Therefore, there is an urgent need to develop green and effective strategies for DON degradation.

The observation of isotopic compositions of atmospheric nitrate in Shanghai China and its implication for reactive nitrogen chemistry.

The occurrence of PM pollution in China is usually associated with the formation of atmospheric nitrate, the oxidation product of nitrogen oxides (NO = NO + NO). The oxygen-17 excess of nitrate (ΔO(NO)) can be used to reveal the relative importance of nitrate formation pathways and get more insight into reactive nitrogen chemistry. Here we present the observation of isotopic composition of atmospheric nitrate (ΔO and δN) collected from January to June 2016 in Shanghai China.

The role of sulfate and its corresponding S(IV)+NO formation pathway during the evolution of haze in Beijing.

To better understand the role of stationary sources during the evolution of haze, we investigated sulfate formation characteristics at different stages of four haze events in Beijing, China. The mass fraction of sulfate in PM increased while that of nitrate declined slightly during the worsening process of most haze events, consistent with higher ratios of SO/NO on haze days (0.50 on average) than those on clean days (0.

Composition and spatial distribution of elements and isotopes of a giant human bladder stone and environmental implications.

The composition and spatial distribution of minerals, trace elements, as well as carbon and nitrogen isotopes from the outer crust to inner nucleus of a 20-year old giant human bladder stone comprising thirteen layers were intensively investigated. Calcium oxalate monohydrate (COM) was found to concentrate in the inner and middle layers, struvite was concentrated in middle and outer layers, and fluorapatite occurred in almost all layers. The spatial distribution of minerals has the potential to provide preliminary knowledge regarding the long-term urine composition, or even the physiological condition of the patient.

δ(13)C-CH4 reveals CH4 variations over oceans from mid-latitudes to the Arctic.

The biogeochemical cycles of CH4 over oceans are poorly understood, especially over the Arctic Ocean. Here we report atmospheric CH4 levels together with δ(13)C-CH4 from offshore China (31°N) to the central Arctic Ocean (up to 87°N) from July to September 2012. CH4 concentrations and δ(13)C-CH4 displayed temporal and spatial variation ranging from 1.

Systematic investigation of the toxic mechanism of PFOA and PFOS on bovine serum albumin by spectroscopic and molecular modeling.

Perfluorinated compounds (PFCs), an emerging class of globally environmental contaminations, pose a great threat to humans with wide exposure from food and other potential sources. The effects of perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) on bovine serum albumin (BSA) under normal physiological conditions were characterized by fluorescence, UV-Vis absorption, Fourier transform infrared (FT-IR) spectroscopy and molecular docking methods. The fluorescence study suggested that the fluorescence quenching of BSA by PFCs was a static procedure forming a PFCs-BSA complex.

Potential toxicity of amphenicol antibiotic: binding of chloramphenicol to human serum albumin.

Antibiotics are widely used in daily life but their abuse has posed a potential threat to human health. To evaluate the toxicity of chloramphenicol (CAP) at the protein level, the interaction between CAP and human serum albumin (HSA) was investigated by fluorescence, Ultraviolet-visible (UV-Vis) absorption, Fourier transform infrared (FT-IR) spectroscopy and molecular docking methods. Fluorescence data revealed that the fluorescence quenching of HSA by CAP was the result of the formation of CAP-HSA complex, and the binding constant was determined to be 3.