AIM: To study apoptotic injury induced by aeactive oxygen species - hydrogen peroxide (H2O2) on cardiac myocytes. METHODS: Cultured rat neonatal cardiac myocytes were treated with H2O2 of various concentra- tion to observe apoptoitic injury of cardiomyocytes by agarose gel electrophoresis, Giemsa - stained smears of cell, and flow cytometry, meanwhile lactate dehydrogenas (LDH) and malondialdehyde (MDA) were determined to assess the effect of H2O2 on lipid peroxidation and permeability of the plasma membrane. RESULTS: 5 mmol/L H2O2 caused culted cardiomyocytes apoptotic morophological characteristics, including nucleosomal DNA fragmentation in my- ocytes by agarose gell electrophoresis (DNA ladder), cell shrinkage, nuclear condensation, and chromatin margin by Giemsa-stained cell smears, and aneuploid peak (AP) - apoptotic bodies occurence by flow cytometry. CONCLU- SONS: H2O2 - induced apotosis in myocytes was a the - and concentration - dependent process, Treatment with low concentration of H2O2(10 mmol/L) rapidly induced a necrotic form of death characterized by smeared patterns of DNA digestion on agarose gel electrophoresis and lethal membrane disuption (as measured by LDH release). Exposure of 5 - 10 mmol/ L H2O2 induced cardiomyocytes apoptosis concurrently with biochemical changes of LDH and MDA increase in the medium.

Objective To explore the incidences of postpartum depression as well as the influencing factors in Guangzhou.Method Nine hundred and seventy women participated in the investigation with the Edinburgh postnatal depression scale(EPDS)to analyze the influenceing factors.Results The incidence rate was 38.87%(377/970). The influencing factors included age,feeding mode,delivery mode and education level.Conclusions The incidence of postpartum depression is at a higher level.The feeding mode,delivery mode and education level are the influencing factors.

Objective To analyze the effects of different supplements on anemia related indexes in rural children. Methods A stratified method was adopted, and six villages (towns) in and around Qinghai Province were selected as intervention sits for the present study. A total of 304 children from 2 to 6 years old at each intervention site meeting the inclusion criteria were screened and divided into three groups (A, B, and C), who were intervened for 3 months. Serum vitamin A, vitamin D and hemoglobin levels were measured before and after the intervention. Results The hemoglobin level of 304 children before intervention was (118.65±16.07) g /L, and the prevalence of anemia was 9.54%. The vitamin A value, vitamin D value and hemoglobin value were increased after three months of the intervention. The changes of vitamin A value, vitamin D value and hemoglobin value in rural children in group C were significantly higher than those in groups A and B. The increase in vitamin A value in rural children aged 3 years was significantly higher than that in other age groups, and the increase in hemoglobin in rural children of 1 year old was significantly higher than that in other age groups. The increase in vitamin A value of rural children of other ethnic groups (mainly Tibetans) was significantly higher than that of Han and Hui nationalities, and the increase of hemoglobin value in Hui rural children was significantly higher than that in Han and other ethnic groups. Conclusion Vitamin A combined with iron dextran tablets was effective in preventing anemia in rural children.