Irrigation leads to new Se-toxicity paddy fields in and around typical Se-toxicity area.

Although the issue has been of much concern and has subsequently been controlled for years, the environmental risk of excess selenium (Se) in farmlands still has not been eliminated in Se-toxicity areas. Different types of farmland utilization can change Se behavior in soil. Thus, located field monitoring and surveys of various farmland soils in and around typical Se-toxicity areas spanning eight years were conducted in the tillage layer and deeper soils.

Selenium distribution in the Chinese environment and its relationship with human health: A review.

This paper reviewed the Se in the environment (including total Se in soil, water, plants, and food), the daily Se intake and Se content in human hair were also examined to elucidate Se distribution in the environment and its effects on human health in China. Approximately 51% of China is Se deficiency in soil, compared with 72% in the survey conducted in 1989. Low Se concentrations in soil, water, plants, human diet and thus human hair were found in most areas of China.

Risk assessment for human health in a seleniferous area, Shuang'an, China.

Shuang'an in Ziyang is a typical high-selenium (Se) area in China, where human selenium (Se) poisoning was reported 30 years ago. To assess the risk of Se poisoning in the area, the Se content in agricultural soil, plant, and water in Naore, Shuang Hekou, and Lin Benhe villages of Ziyang was systematically investigated. The probable daily intake (PDI) was calculated on the basis of Se contents in food, water, and dietary habits to evaluate the risk of selenosis.

[Effects of Nitrogen Application on Selenium Uptake, Translocation and Distribution in Winter Wheat].

In order to better understand the effects of nitrogen application on accumulation, translocation and distribution of selenium in winter wheat and to provide theoretical reference for reasonable nitrogen application and increasing selenium content of grains. A pot experiment was carried out under greenhouse conditions with Se1 (0.74 mg·kg) or Se2 (2.

Human health risk assessment of heavy metals in the irrigated area of Jinghui, Shaanxi, China, in terms of wheat flour consumption.

Contamination of heavy metals (HMs) in agricultural soil has become a serious environmental problem because it poses a serious threat to human health by entering into food chains. Wheat is a staple food of the majority of the world's population; therefore, understanding the relationship between HM concentration in soils and its accumulation in wheat grain is imperative. This study assessed the concentrations of HMs (i.

Selenium geochemical distribution in the environment and predicted human daily dietary intake in northeastern Qinghai, China.

Ping'an is a selenium (Se)-rich region located in northeastern Qinghai Province of China. To better understand the selenium geochemical distribution and its potential ecological effects, this field study investigated the Se distribution in the local environment, soil Se bioavailability, and the daily dietary Se intake of Ping'an residents. Concentrations of total Se were determined in soil, plant, water, and food samples.

Suitable depth of epidural puncture in nulliparous pregnant woman.

We study the suitable depth for epidural puncture in primiparas so as to decrease epidural complications and provide anesthesiologists with an appropriate insertion guide. A prospective study of 87 primipara patients receiving labor analgesia who had epidural punctures in the course of vaginal delivery were randomly divided into 3 groups: the L 3,4 group (N = 27), the L 2,3 group (N = 29), and the L 1,2 group (N = 26). Predictive statistical models were used for the formulation of the ideal epidural puncture needle depth.

Transformation of heavy metal fractions on soil urease and nitrate reductase activities in copper and selenium co-contaminated soil.

This study aims to explore the effects of the distribution, transformation and bioavailability of different fractions of copper (Cu) and selenium (Se) in co-contaminated soils on soil enzymes, providing references for the phytoremediation of contaminated areas and agriculture environmental protection. Pot experiments and laboratory analysis were used to investigate the transformation and bioavailability of additional Cu and Se for pakchoi (Brassica chinensis) in co-contaminated soil. In the uncontaminated soil, Cu mainly existed in residual form, whereas Se was present in residual form and in elemental and organic-sulfide matter-bound form.