Ecotoxicological assessment of grey water treatment systems with Daphnia magna and Chironomus riparius.

In order to meet environmental quality criteria, grey water was treated in four different ways: 1) aerobic 2) anaerobic+aerobic 3) aerobic+activated carbon 4) aerobic+ozone. Since each treatment has its own specific advantages and disadvantages, the aim of this study was to compare the ecotoxicity of differently treated grey water using Chironomus riparius (96 h test) and Daphnia magna (48 h and 21d test) as test organisms. Grey water exhibited acute toxicity to both test organisms. The aerobic and combined anaerobic+aerobic treatment eliminated mortality in the acute tests, but growth of C. riparius was still affected by these two effluents. Post-treatment by ozone and activated carbon completely removed the acute toxicity from grey water. In the chronic toxicity test the combined anaerobic+aerobic treatment strongly affected D. magna population growth rate (47%), while the aerobic treatment had a small (9%) but significant effect. Hence, aerobic treatment is the best option for biological treatment of grey water, removing most of the toxic effects of grey water. If advanced treatment is required, the treatment with either ozone or GAC were shown to be very effective in complete removal of toxicity from grey water.

Development of the Organ Donation and Transplantation Knowledge Survey for use in Asian American adolescents.

The need for kidney transplantation among Asian Americans is increasing owing to hypertension, diabetes mellitus, and the shortage of available organs. This need is likely to increase as the relatively young Asian population ages. However, knowledge about organ donation and transplantation in this population has been little investigated. The objectives of this study was to develop an Organ Donation and Transplantation Knowledge Survey for use in Asian Americans and to examine its psychometric properties. Internal consistency (Cronbach alpha) and factor analyses were used to determine the reliability and validity of the survey in 121 Asian American adolescents residing on the Big Island of Hawaii. Our results indicate that the survey had adequate reliability and was psychometrically valid for evaluating knowledge about organ donation and transplantation. More studies are needed to validate the usefulness and psychometric properties of the Organ Donation and Transplantation Knowledge Survey in other groups.

Type of disturbance and ecological history determine structural stability.

This study aims to reveal whether complexity, namely, community and trophic structure, of chronically stressed soil systems is at increased risk or remains stable when confronted with a subsequent disturbance. Therefore, we focused on a grassland with a history of four centuries of patchy contamination. Nematodes were used as model organisms because they are an abundant and trophically diverse group and representative of the soil food web and ecosystem complexity. In a field survey, a relationship between contaminants and community structures was established. Following, two groups of soil mesocosms from the field that differed in contamination level were exposed to different disturbance regimes, namely, to the contaminant zinc and a heat shock. The zinc treatment revealed that community structure is stable, irrespective of soil contamination levels. This implies that centuries of exposure to contamination led to adaptation of the soil nematode community irrespective of the patchy distribution of contaminants. In contrast, the heat shock had adverse effects on species richness in the highly contaminated soils only. The total nematode biomass was lower in the highly contaminated field samples; however, the biomass was not affected by zinc and heat treatments of the mesocosms. This means that density compensation occurred rapidly, i.e., tolerant species quickly replaced sensitive species. Our results support the hypothesis that the history of contamination and the type of disturbance determine the response of communities. Despite that ecosystems may be exposed for centuries to contamination and communities show adaptation, biodiversity in highly contaminated sites is at increased risk when exposed to a different disturbance regime. We discuss how the loss of higher trophic levels from the entire system, such as represented by carnivorous nematodes after the heat shock, accompanied by local biodiversity loss at highly contaminated sites, may result in detrimental effects on ecosystem functions.

Behavioural, emotional and family functioning of hospitalized children in China and Hong Kong.

PURPOSE: This study examined behavioural and emotional problems, social competence and family functioning of hospitalized Chinese children in Hong Kong and the Chinese Mainland. METHOD: A sample of 210 hospitalized children (ages 2-11 years) and their families participated in the study. The families were from a cross-section of geographical areas in Hong Kong (two hospitals) and the Chinese Mainland (five hospitals). Parents completed an age-appropriate Chinese version of the Child Behaviour Checklist and the Family Assessment Device. Multiple regression models were used to examine predictors of children's behaviour problems. RESULTS: Behavioural patterns appeared to be specific to the developmental stage. Children had greater problems when their families demonstrated poorer affective involvement. Hospitalized children on the Chinese Mainland experienced more internalizing and externalizing behaviour problems than those in Hong Kong. Sick children, according to their parents, however, demonstrate some resiliency based on social and academic competency factors. CONCLUSIONS: Hospitalized Chinese children manifest behavioural, emotional and family problems that vary by region, the child's development and gender. Problems predominantly of an internalizing nature characterized this group. The findings support the need for culturally appropriate behavioural assessments and interventions with hospitalized children.

Effect of acute stress on plasma beta-corticosterone, estradiol-17 beta and testosterone concentrations in juvenile American alligators collected from three sites within the Kissimmee-Everglades drainage basin in Florida (USA).

The effect of acute stress on plasma beta-corticosterone (B), testosterone (T) and estradiol-17beta (E2) concentrations in juvenile alligators collected from sites with varying sediment contaminants was examined in this study. Dramatic increases in plasma B concentrations were observed in alligators from all of the sites after 2 h of capture although females from the intermediate contaminant site exhibited a significantly lower percentage increase in B than females from the other two sites. Males from the site with the highest contaminant levels exhibited elevated initial B concentrations relative to the other sites. This pattern was not observed after 2 h of restraint. Females from the highest contaminant site exhibited depressed initial T when compared to the other sites although this pattern was not observed after 2 h of restraint. Neither E2 nor T decreased after 2 h in females, whereas T concentrations decreased in all males over the same time period. The variance associated with these endpoints was also examined to determine whether it could serve as a more sensitive marker for perturbations of the endocrine system and stress response. Females from the higher and intermediate contaminant sites exhibited the lowest and highest standard errors (respectively) associated with 2 h plasma B concentrations with no differences among mean concentrations suggesting a perturbation of the stress response in these animals that was not detected by examining the means. We concluded that the environmental contaminants could be acting as stressors, leading to the observed differences.

Child sexual abuse treatment: misinterpretation and mismanagement of child sexual behavior.

OBJECTIVE: The purpose of the study was to examine caregiver understanding of the impact of child sexual abuse and the management of abused children in residential treatment. METHODS: A purposive sample of 20 registered nurses and child care workers were interviewed about their experiences working in residential treatment and their knowledge about child development and child sexual abuse and its application to practice. Data from interviews and field notes were analysed using dimensional analysis. FINDINGS: Caregivers had limited knowledge of the sequelae of child sexual abuse. Developmentally appropriate behaviour of sexually abused children, as well as behavioural manifestations of child sexual abuse, were often misinterpreted and mismanaged. CONCLUSION: Residential care of sexually abused children should be based on sound developmental principles and caregiver sensitivity.

Methodological considerations in children's focus groups.

Focus groups are a well-known qualitative approach to gathering data in health science research. The literature on focus groups, however, primarily discusses adults as subjects. Unfortunately, the scant reports of studies using children as participants in focus groups have not described their methods in detail. This article discusses the use of children (age 6-12) in focus groups, and highlights methodological considerations in this approach, with particular attention to the integration of developmental principles. Focus groups with children can capture their perspectives, original ideas, and insights, which are often neglected in more traditional pediatric research. Focus groups can also serve as an innovative approach to understanding children's experiences from a developmental perspective. Further, focus groups free children and investigator from the data-gathering limitations placed by literacy/reading levels that plague quantitative methods using self-report. By using relatively homogeneous groups, common cultural, emotional, and cognitive processes and responses are revealed that normally would not come to light in structured data collection. Focus groups offer a rich, interactive and developmentally effective approach to planning, content and evaluation in research with children.

Self-protection in adolescents in foster care.

PROBLEM: Adolescents in long-term foster care experience significant health and mental health problems. Little is known about their perceptions of the impact of foster care. METHOD: Seventeen adolescents were interviewed in their foster group homes. Dimensional analysis was used to develop theory on the impact of foster care. FINDINGS: Adolescents in foster care engaged in self-protection strategies secondary to experiences of devaluation and uncertainty in foster care, including guarding foster child status, maintaining a defensive posture, distancing self, and keeping relationships superficial. Self-protection resulted in a veneer of self-reliance and social detachment. CONCLUSIONS: Strategies are suggested to address devaluing experiences and promote positive identity development in foster care.

Prevention of mental health problems in adolescence.

Mental health problems in adolescence are noteworthy in that they are outside of the normative adolescent developmental experience. Twenty percent of adolescents in the United States experience significant and persistent mental disorders, which indicates the need for prevention and early intervention. The purpose of this chapter is to review research on the prevention of mental health problems in adolescence. Various sociocontextual factors that place an adolescent at risk for mental health problems are examined. In particular, studies that identify risk factors for problems common to adolescence, including depression, suicide, and disorders of conduct and eating are reviewed. Evaluative research on prevention and early intervention programs in this substantive area are also critically reviewed. A summative report and critique on the state of research in this area is given along with suggestions for future research. A call for the active involvement of nursing in this research agenda is made.