Erythrocyte membrane -3 PUFA are inversely associated with breast cancer risk among Chinese women.

The relationship between erythrocyte membrane -3 PUFA and breast cancer risk is controversial. We aimed to examine the associations of erythrocyte membrane -3 PUFA with odds of breast cancer among Chinese women by using a relatively large sample size. A case-control study was conducted including 853 newly diagnosed, histologically confirmed breast cancer cases and 892 frequency-matched controls (5-year interval).

Serum flavin mononucleotide but not riboflavin is inversely associated with the risk of colorectal cancer.

Vitamin B is essential for DNA methylation, stability and repair, which may influence the development and pathogenesis of several cancers. However, data regarding the associations of circulating vitamin B with colorectal cancer risk are limited. The purpose of this study was to investigate the associations between serum vitamin B and colorectal cancer risk, particularly among participants with different serum levels of vitamin B or folate.

[Temporal Response of Subterranean Karst Stream Hydrochemistry to Urbanization].

The hydrochemical responses of underground rivers to urbanization were studied using a 25-year groundwater observation dataset and remote sensing. We found that as urbanization progresses, the mineralization degree of underground rivers gradually increases; time-series data for dominant hydrochemical indicators changed from HCO·SO-Ca·Mg during the dry season and HCO-Ca·Mg during flood season to HCO·Cl-Ca, HCO·SO-Ca, HCO-Ca, and HCO·SO-Ca·Mg. Influenced by surface precipitation input, the groundwater chemistry of underground rivers varies greatly during the dry season and the flood season.

[Rock Weathering Characteristics and the Atmospheric Carbon Sink in the Chemical Weathering Processes of Qingshuijiang River Basin].

Carbon sink produced during rock weathering is critical to global carbon cycles. In this work, the major ion chemistry and ion sources of Qingshuijiang River Basin were investigated. The principal component analysis, mass balance approach and deduction method were applied for estimating the weathering rate and atmospheric CO consumption via the chemical weathering of rocks.

[Hydrochemical Characteristics and Sources of Qingshuijiang River Basin at Wet Season in Guizhou Province].

According to the ion content and chemical characteristic analysis of Qingshuijiang River water during wet season, the result shows that the chemical composition of the river water is dominated by Ca2+, HCO(3-); Mg2+, and SO4(2-). The TDS concentration (213.96 mg · L(-1)) is significantly higher than the average value of rivers worldwide.

[Isotopic composition and isotope tracing of sulfur in atmospheric precipitation at the head area of the Three Gorges Reservoir, China].

Rainwater samples were collected in the head area of the Three Gorges Reservoir from June 2009 to July 2010. The SO4(2-) content and the characteristics of sulfur isotopic composition were determined. The results showed that the concentrations of SO4(2-) ranged from 31.

[Chemical characterization of rainwater in a karst rural site: a case study of Puding, China].

Rainwater samples of a karst rural site in Puding County, Guizhou Province, China over a period of one year (2008) were collected and the major ion concentrations were measured. The pH of samples varied from 4.6 to 7.