An automated multi-unit composting facility for biodegradability evaluations

A system has been developed for studying the biodegradation of natural and synthetic polymeric material. The system is based on standard methods developed by the European Committee for Standardisation (CEN TC 261) (ISO/DIS 14855) and the American Society of Testing Materials, 'ASTM. Standard Test Method for Determining Aerobic. Biodegradation of Plastic Materials under Controlled Composting Conditions' (ASTM D 5338-92). A new low-cost compost facility has been used which satisfies the requirements of these standards. The system has been automated for data collection and has been run under the conditions specified by the standards. In the system, cellulose, newspaper and two starch-based polymers were treated with compost in a series of 3dm(3) vessels at 52 degreesC and under conditions of optimum moisture and pH. The degradation was followed over time by measuring the amount of carbon released as carbon dioxide. (C) 2001 Society of Chemical Industry.

Refusal of treatment

Patients' thoughts, feelings and desires are communicated in a variety of ways, and require sympathetic, critical interpretation. Patients need clear, evidence-based medical information so that they can make their own decisions about whether to consent to or refuse medical treatment. Treatment refusal may provide an opportunity to introduce patients to advance care planning. Unconscious motivations in doctors may obstruct good clinical decision-making. Although respect for the patient's responsibility to make healthcare decisions should be a condition of the clinical relationship, healthcare decision-making is a collaborative process.

Ethical dilemmas confronting dentists in Queensland, Australia

Background: This paper details contemporary ethical dilemmas encountered by Queensland dentists. Methods: An age-stratified sample of 499 dentists resident in Queensland was surveyed. The questionnaire contained scenarios of five common ethical dilemmas. In addition, open-ended questions sought the respondent's most frequent, difficult and recent ethical dilemmas, and where they would seek guidance in dealing with ethical problems. Results: Respondents acknowledged the patient's rights in treatment decisions and the dentist's right to refuse demands for inappropriate treatment. However, responses varied in the extent to which dentists may influence treatment decisions. Few respondents would ignore evidence of poor dental treatment but they are evenly divided in choosing to inform the patient, the dentist or both. Poor quality treatment is the most frequent and difficult dilemma, and half have experienced this problem recently. Requests by patients for fraudulent receipts occur in a third of responses. Dentists develop ethical values from multiple sources but for help with dental ethical problems, 90 per cent of respondents would consult another dentist. Conclusions: Of the ethical dilemmas discussed in this survey, those relating to poor quality treatment confronted most respondents. Also the actions of dentists in dealing with these dilemmas were most varied.

Clinical pathways in mental health

Caremaps [Clinical pathways] are like microwave ovens: five years from now, members of all disciplines will marvel at how they ever got along without them. Of course there will always be some that refuse to accept innovation or who are technophobic. Most people, however, will readily incorporate useful, practical new products into their daily lives.' Zander [1]

Who owns the child in hospital? A preliminary discussion

Aim. To 'own' a person is considered an infringement of human rights, but we suggest that concepts of ownership influence interactions between parents and staff when a child is admitted to hospital. This paper aims to stimulate debate and contains an explanation of the exploration of the literature for research and discussion of ownership of the child. Method. A wide variety of library indexes, databases and populist media were examined although it was impossible to examine all literature which may have contained references to this topic, and, apart from databases which contained abstracts in English, we could not include literature written in any language other than English, Swedish, and Icelandic. Findings. We found no research that examines how concepts of ownership of a child affects communication between health professionals and parents and, ultimately, the delivery of health care. This paper begins discussion on the issues. Discussion. Historical literature shows that ownership of humans has been a part of many cultures, and parents were once considered to own their children. Ownership of another has legal connotations, for instance in guardianship struggles of children during marriage breakup and in ethical debates over surrogacy and products of assisted conception. Within health care, it becomes a contentious issue in transplantation of body parts, in discourse on autonomy and informed consent, and for religious groups who refuse blood transfusions. In health care, models such as family centred care and partnership in care depend on positive communication between parents and staff. If a hospital staff member feels that he/she owns a child for whom he/she is caring, then conflict between the staff member and the parents over who has the 'best interests of the child' at heart is possible. Conclusion. We encourage debate about concepts of who owns the hospitalized child - the parents or the staff? Should it be argued at all? Is the whole concept of ownership of another, be it adult or child, the ethical antithesis to modern beliefs about human rights? Comment on this issue is invited.

Quantification of cellulase activity using cellulose-azure

Despite wide application of cellulose-azure as a substrate for measuring cellulase activity, there is no quantification of hydrolysis rate or enzymatic activities using this substrate. The aim of this study was to quantify the hydrolysis rate in terms of product formation and dye released using cellulose-azure. The amount of dye released was correlated with the production of glucose and the enzyme concentrations. It is shown that the lack of correlation can be due to (1) repression of the release of the azure-dye when azure-dye accumulates, (2) presence of degradable substrates in the cellulase powder which inflate the glucose measurements and (3) the degradation of cellulose which is not linked to the dye in the cellulose-azure. Based on the lack of correlation, it is recommended that cellulose-azure should only be applied in assays when the aim is to compare relative activities of different enzymatic systems. (c) 2005 Elsevier B.V. All rights reserved.