PCBs and OCPs in human milk and selected foods from Luqiao and Pingqiao in Zhejiang, China

This study was conducted to measure the levels of 23 PCB congeners and 6 organochlorine pesticides (OCPs) in human milk and three food types collected from Luqiao and Pingqiao in Zhejiang Province, China. An effort was also made to explore the potential health risk for the mothers and breast-fed infants living in these two localities. Luqiao was selected as the sampling site because it is the largest place for the disassembly of obsolete transformers and electrical waste in China. Pingqiao, located 100 kin NW of Luqiao, is not known to be a place for any electronic or electrical waste and hence was chosen as the control site. Both localities are important agricultural places in the province. The organochlorines were measured in the samples using the GC-PECD technique. Micro-EROD bioassay method was also used as a complement of the chemical analysis to estimate the TEQ levels of dioxin-like PCBs in human milk. The data showed that the human milk, rice, hen egg, and fish samples from Luqiao were more heavily contaminated with PCBs than those from Pingqiao, suggesting that the mothers and their breast-fed infants in Luqiao tended to receive greater exposure to PCBs than those living in Pingqiao. The OCP levels in the two localities were found comparable, suggesting that the major source of contamination with these pesticides was from their agricultural uses. Significant correlation (R-2 = 0.87, P < 0.001) of PCB TEQs was found between the bioassay and chemical analysis method, suggesting that micro-EROD is an effective method for comprehensive determination of TEQ levels in human milk. Comparison with literature data showed that the PCB levels in milk samples from Luqiao were significantly higher than those from localities in other Chinese provinces and comparable to those in developed or industrialized countries. (c) 2007 Published by Elsevier B.V.

教养方式、亲子关系对青少年给予母亲情感支持的影响

Emotional support, as an important form of social supports, has great impact on the life of both caregivers and receivers. Many studies on adult children and old parents indicate that emotional support is closely related to parents’ well-being, and the relation quality between old parents and adult children is one of the factors influencing adult children’s support offering. However, the study on adolescents’ emotional support to their parents is quite rare. What’s more, it has been found that emotional support skills children have learnt at home have life-time influence on children’s response to other’s emotional needs. It is assumed that to some extent the emotional support styles between parents and adolescents are relatively stable, and they are related to the care children give to their parents after they advance to old age. Hence, it is necessary to study the emotional support of adolescent in order to at last improve the well-being of old parents. Totally speaking, the aim of this study is to explore the relation between parenting styles and adolescents’ emotional support offering, as well as the effects of mother-child relationships. In addition, culture is a factor having impact on parenting styles, parent-child relationships and emotional support. So we have designed this cross-cultural study to explore cultural differences. The results are as follows: (1) As to Chinese and Indonesian mothers, their Acceptance of adolescents’ behaviors has significant positive predictive effect on children’s emotional support. Besides, the Intimacy and Approval dimensions of mother-child relationships partially mediate the path from parenting styles to emotional support offering, and those effects have no significant difference in China and Indonesia. (2) Chinese and Indonesian mother’s Rejection to adolescents has significant positive predictive effect on Conflict between mothers and adolescents, but has no direct effect on adolescents’ emotional support offering. (3) Adolescents’ support offering has no significant predictive effect on their willingness to help their parents. (4) Adolescents’ support offering has significant predictive effect on their motivation to provide emotional support to their parents. However, the relation between adolescents’ support offering and the willingness to help their parents is not clear. (5) Adolescents have scored high in Acceptance parenting style dimension and relatively low in Rejection dimension, which indicate that mothers in China and Indonesia adopt positive parenting styles. Both Chinese and Indonesian mother-child relationships are good. However, Indonesian adolescents have perceived more Intimacy and Approval from mothers, and there is no significant difference between Chinese and Indonesian adolescents and mothers in the dimension of Conflict.