Nano-silica particles synergistically IgE-mediated mast cell activation exacerbating allergic inflammation in mice.

Background: Allergic respiratory diseases have increased dramatically due to air pollution over the past few decades. However, studies are limited on the effects of inorganic components and particulate matter with different particle sizes in smog on allergic diseases, and the possible molecular mechanism of inducing allergies has not been thoroughly studied.

Methods: Four common mineral elements with different particle sizes in smog particles were selected, including AlO, TiO, FeO, and SiO.

Chlorine levels and species in fine and size resolved atmospheric particles by X-ray absorption near-edge structure spectroscopy analysis in Beijing, China.

An understanding of the species of chlorine is crucial in the metropolis-Beijing, which is suffering serious haze pollution with high frequency. Particulate Matters (PMs) with five different sizes were collected in Beijing from July 2009 to March 2016, and characterized non-destructively by X-ray absorption near edge structure spectroscopy. PM, PM and PM contributed for the major PMs mass in spring and summer, PM and PM contributed for the major PMs mass in autumn and winter.

[Vertical Distribution of Heavy Metals and Its Response to Organic Carbon in Red Soil Profile].

The vertical distribution patterns, the source and correlation of heavy metals were characterized in the bulk soil and different soil aggregates of arable red soil profile (0-100 cm) in Hunan province. Their response to organic carbons in proflie was explored as well. Principal component analysis (PCA) suggested that elements could be divided into two principal components, the metals of the first group were Zn,Cu,Pb,As,Cd, and the second group metals were Cr, Ni.

[Chlorine speciation and concentration in cultivated soil in the northeastern China studied by X-ray absorption near edge structure].

A procedure has been proposed to determine chlorine speciation and concentration in soil with X-ray absorption near edge structure (XANES), and this method was applied to study the cultivated soil (bog, dark brown and black cultivated soil) in the Northeastern China. Qualitative analysis was carried out by least-squares fitting of sample spectra with standard spectra of three model compounds (NaCl, 3-chloropropionic acid, chlorophenol red). Linear correlation between the absolute fluorescence intensity of a series of NaCl standards and the Cl concentration was used as quantification standard for measuring the total Cl concentration in samples.

[Distribution characteristics and environmental significance of heavy metals in soil particle size fractions from tropical forests in China].

Three tropical forest soils were collected from Haikou, Qionghai and Tunchang in Hainan Island. Soil particle size fractionations were conducted using the standard dry-sieving procedure. Distribution of heavy metals in bulk samples and particle size fractions was determined by ICP-MS.

[Determination of nine hazardous elements in textiles by inductively coupled plasma optical emission spectrometer after microwave-assisted dilute nitric acid extraction].

Textiles are easily contaminated by heavy metals in the course of processing. In order to monitor the quality of textiles, a new method was developed for simultaneous determination of arsenic, antimony, lead, cadmium, chromium, cobalt, copper, nickel and mercury in textiles by inductively coupled plasma optical emission spectrometry (ICP-OES) after microwave-assisted dilute nitric acid extraction. After optimizing extraction conditions, we ultimately selected 5% nitric acid as extractant and 5 min as extraction time with the extraction temperature of 120 degrees C and instrument power of 400W in the microwave-assisted extraction procedure.

[Levels of polychlorinated biphenyls in adolescents' hair from Gongzhuling, Jilin].

Adolescents' (12-18) hair samples (n = 23) collected from Gongzhuling Jilin were analyzed for 30 polychlorinated biphenyl (PCB) congeners by gas chromatograph-mass spectrometer (GC-MS). The distribution characteristics, sources and relationship with genders of PCBs in adolescents' hair were addressed as well. The results indicated that the detection frequency of PCBs were 100% with average concentration of (68.

Tyrosine phosphorylation/dephosphorylation regulates peroxynitrite-mediated peptide nitration.

Proteins are targets of reactive nitrogen species such as peroxynitrite and nitrogen dioxide. Among the various amino acids in proteins, tyrosine and tryptophan residues are especially susceptible to attack by reactive nitrogen species. On the other hand, protein tyrosine phosphorylation has gained much attention in respect to cellular regulatory events and signal transduction.

[Source and distribution of organohalogens in atmosphere in Shanghai].

Neutron activation analysis (NAA) and gas chromatography (GC) were used to determine organohalogens in air particles and precipitation in Jiading District, Shanghai, collected between December 2004 and August 2005. Analysis of extractable organohalogens (EOX), extractable persistent organohalogens (EPOX), organochlorine pesticides (OCPs) and polychlorinated diphenyls (PCBs) in atmosphere were presented. Monthly average concentration of EOX in air particles (TSP, PM10) and precipitation were 1425.