Use of terrestrial field studies in the derivation of bioaccumulation potential of chemicals

Field-based studies are an essential component of research addressing the behavior of organic chemicals, and a unique line of evidence that can be used to assess bioaccumulation potential in chemical registration programs and aid in development of associated laboratory and modeling efforts. To aid scientific and regulatory discourse on the application of terrestrial field data in this manner, this article provides practical recommendations regarding the generation and interpretation of terrestrial field data. Currently, biota-to-soil-accumulation factors (BSAFs), biomagnification factors (BMFs), and bioaccumulation factors (BAFs) are the most suitable bioaccumulation metrics that are applicable to bioaccumulation assessment evaluations and able to be generated from terrestrial field studies with relatively low uncertainty. Biomagnification factors calculated from field-collected samples of terrestrial carnivores and their prey appear to be particularly robust indicators of bioaccumulation potential. The use of stable isotope ratios for quantification of trophic relationships in terrestrial ecosystems needs to be further developed to resolve uncertainties associated with the calculation of terrestrial trophic magnification factors (TMFs). Sampling efforts for terrestrial field studies should strive for efficiency, and advice on optimization of study sample sizes, practical considerations for obtaining samples, selection of tissues for analysis, and data interpretation is provided. Although there is still much to be learned regarding terrestrial bioaccumulation, these recommendations provide some initial guidance to the present application of terrestrial field data as a line of evidence in the assessment of chemical bioaccumulation potential and a resource to inform laboratory and modeling efforts

Long-term Climate Change: Projections, Commitments and Irreversibility

This chapter assesses long-term projections of climate change for the end of the 21st century and beyond, where the forced signal depends on the scenario and is typically larger than the internal variability of the climate system. Changes are expressed with respect to a baseline period of 1986–2005, unless otherwise stated

Nurses' attitudes, behaviours and perceived barriers towards pressure ulcer prevention

Background. Pressure ulcers are not a plague of modern man; they have been known to exist since ancient Egyptian times. However, despite the increasing expenditure on pressure ulcer prevention, pressure ulcers remain a major health care problem. Although nurses do not have the sole responsibility for pressure ulcer prevention, nurses have a unique opportunity to have a significant impact on this problem. Aims and objectives. The specific aims of the study were to identify: • Staff nurses’ attitudes towards pressure ulcer prevention. • The behaviour of staff nurses’ in relation to pressure ulcer prevention. • Staff nurses’ perceived barriers towards pressure ulcer prevention. Design. A cross-sectional survey method was used. Methods. A randomly selected sample of staff nurses (n = 300) working in an acute care setting in an urban location was invited to participate. Data were collected using a prepiloted questionnaire. Data analysis was carried out using SPSS version 10 and SPSS Text Smart version 1.1. Results. The nurses surveyed demonstrated a positive attitude towards pressure ulcer prevention. However, prevention practices were demonstrated to be haphazard and erratic and were negatively affected by lack of time and staff. These barriers prevented the nurses’ positive attitude from being reflected into effective clinical practice. Education, although poorly accessed, or made available, was rarely cited as impeding practice in this area. Conclusion. This study suggests that positive attitudes are not enough to ensure that practice change takes place, reinforcing the complex nature of behavioural change. Implementation strategies should introduce ways in which key staff can be empowered to overcome barriers to change. Relevance to clinical practice. This study provides a unique exploration of Irish nurses’ attitudes, behaviours and perceived barriers towards pressure ulcer prevention, thereby contributing to the body of knowledge on this subject. As tissue viability is a new and emerging speciality, this information will contribute to evidence based practice in this area of patient care and will form the basis for the development of an educational strategy for pressure ulcer prevention and management