In vitro effects of metal ions on lipid peroxidation induced by alcohol in mice liver homogenate.

The study is aimed to estimate the effect of different heavy metals such as Hg2+, Cd2+, Mn2+, Cr3+, Ni2+, Se2O3(2-), As2O3 water solution and combined effects of Hg2+, Mn2+, Cr3+ on lipid peroxidation in mice liver homogenate in vitro. Lipid peroxidation was determined as thiobarbituric acid-reacting materials (TBA). We select five different concentrations of selected ions for experiments.

[Relationship between calcium content and its character in fetal tissues and calcium deficiency of minor].

In order to probe the relationship between calcium content and its status in fetal tissue and minor's calcium deficiency, the calcium content of seven tissues of fetus aged 4 to 10 month was measured and analyzed. Results showed that the calcium content in fetal tissues was an unstable variable, and it was a function of spatio-temporal factors. Calcium content in fetal tissues reduced with the increase of age and weight of tissue, making a continuous decrease of the calcium content in per gram tissue.

[The action of different kinds of ions on free radical reaction induced by Vc in rat liver homogenate].

The value of OD532 nm of malondialdehyed(MDA) formed by lipid peroxidation was used as an indirect index of reaction of free radicals. The roles of Hg2+, Mn2+, Ni2+, Cd2+, Cr3+, SeO3(2-) and water solution of As2O3 in vitro system of ascorbic acid producing free radicals were studied. The results indicated that Mn2+ and Cr3+ inhibited free radicals induced by ascorbic acid but on the contrary, Hg2+, Cd2+ and As2O3 showed an enhancing effect, and the roles of Ni2+, SeO3(2-) were ambiguous.

Contents of chemical elements in stomach during prenatal development: different age-dependent dynamical changes and their significance.

Aim: To observe dynamic of different chemical elements in stomach tissue during fetal development.

Methods: To determine contents of the 21 chemical elements in each stomach samples from fetus aging four to ten months. The content values were compared to those from adult tissue samples, and the values for each month group were also analyzed for dynamic changes.

[Dynamics of contents of chemical elements in fetal liver, and its physiological and nutritional significance].

The dynamics of contents of chemical elements in fetal liver, and its physiological and nutritional significance are studied. Twenty-one chemical elements in livers of fetus from induced abortion aged four to ten months are measured and are compared with those in adult. The relativity between the monthly average contents of twenty-one elements and fetus month age are analyzed and assorted.

[Safety threshold of fluorine in endemic fluorosis regions in China].

Four endemic fluorosis regions in China and their environmental epidemiological characteristics were summarized in this paper. It shows that the epidemiology of endemic fluorosis is closely related to geochemical parameters of local environment. The food-web and dose-effect relationship of fluoride from environment to human body in different types of endemic fluorosis regions were studied.

Selenium in soil and endemic diseases in China.

Selenium is an essential element for humans, animals and some species of microorganisms. The biological function of selenium shows dual characteristics. The selenium content range between toxic and deficient concentration is very narrow.