Opvoeden tot sociale verantwoordelijkheid : de verzoening van wetenschap, ethiek en sekse in het sociaal werk in Nederland rond de eeuwwisseling

Sociologists use to describe social work as a typical example of a immature or semi-profession. The emergence of social work in social history is part and parcel of 'forces of organized virtue', whilst in womenstudies early social work is usually considered as a consequence of the doctrine of separate spheres and the nineteenth century cult of domesticity.In this research into the articulation of social work as a feminine professional domain, critical observations are made about this three different ways of looking at the history of social work- It is argued that both functionalist and marxists concepts of professionalism do not offer very fruitful starting points for research, because of their presuming an opposition between altruism and selfinterest. Instead the present study of the history of social work explores the complex of social and scientific forces in the context of which social work developed around the turn of the century and examines the purport that altruism and selfinterest got in this context.The origin of social work is related to the growing scientific critique of precepts and habits of care in the eighteenth and nineteenth century, which cleared the road for a new public body for care and prevention. Following doctors and engineers who succeeded in mobilizing public support for the eradication of infectious diseases and the clearing of slums, social scientists attracted attention to the relationship between social well-being and the environment. With the help of certain sociological and philosophical notions concerning the origins of social inequality and the need for social regulation of society, social work pioneers defined a professional domain in which science, ethics and gender went well together. In their sociological vision, men and women, rich and poor, were the product of social conditions, whilst social conditions in their turn were the consequence of human intervention. The interplay between man and society and the changeableness of social relations offered important starting points for the development of a own form of feminine expertise in the social field.According to social workers professional altruism could be neither inborn nor based on personal sentiments. Self-love and social feeling were supposed to be brought into balance by introspection and serious study of social relations. Women were not social beings by nature and did not know by intuition how to find their way in the complicated and diffuse complex of social policy and social pedagogy. Education for social responsibility was not only concerned with the poor, but was also considered a necessity for the bourgeois circles from which social workers themselves usually originated. The propensity for scientific philanthropy amongst social work pioneers and their critique of 'idleness' and 'family egoism' in bourgeois circles, which were often neglected in Dutch research, form the key-points of the formation of a new professional identity of women. ]heir perspective lay in all kinds of social work, whether paid or unpaid.The emergence of social work fitted in with a tradition in which the scientific management of society had primacy over politics and in which individual development had to be brought into balance with public spirit. Social work pioneers thought to find the solution for the woman question and the social question in a 'socialism-without-class-struggle' and a 'feminism-without-a- battle-between-the-sexes', in which gradual social transformation took place under the guidance of social experts.By investigating the meaning of altruism and self-interest from a historical perspective, it becomes clear that a number of well-known theses concerning 'civilized' feminine professions need to be reconsidered. Thus the discussions regarding the organization of the school for social work and about the approach to the different sorts of work, show that social work can no longer be considered as traditional charity in a new disguise. The articulation of altruism and feminine talent for the ethical dimensions of social work seems to be more complex and contradictory than used to be supposed till now.</p

Differences in metal sequestration between zebra mussels from clean and polluted field locations

Organisms are able to detoxify accumulated metals by, e.g. binding them to metallothionein (MT) and/or sequestering them in metal-rich granules (MRG). The different factors involved in determining the capacity or efficiency with which metals are detoxified are not yet known.In this work we studied how the sub-cellular distribution pattern of cadmium, copper and zinc in whole tissue of zebra mussels from clean and polluted surface waters is influenced by the total accumulated metal concentration and by its physiological condition. Additionally we measured the metallothionein concentration in the mussel tissue. Metal concentration increased gradually in the metal-sensitive and detoxified sub-cellular fractions with increasing whole tissue concentrations. However, metal concentrations in the sensitive fractions did not increase to the same extent as metal concentrations in whole tissues. In more polluted mussels the contribution of MRG and MT became more important. Nevertheless, metal detoxification was not sufficient to prevent metal binding to heat-sensitive low molecular weight proteins (HDP fraction). Finally we found an indication that metal detoxification was influenced by the condition of the zebra mussels. MT content could be explained for up to 83% by variations in Zn concentration and physiological condition of the mussels

Reversible and Irreversible Effects of Temperature on Amelogenesis of Hamster Tooth Germs In Vitro

Hamster first hamster molar tooth germs in early secretory stage of amelogenesis were cultured for one day in vitro at 6°C, 22°C, 37°C or 45°C in the presence of 3H-proline, 45Ca and 32P-orthophosphate. Other explants were cultured without these labels and after culture examined by histology. The highest temperature tested was lethal to the explants, decreased total dry weight and rapidly increased total uptake of the radio-labelled mineral ions, probably merely due to physicochemical modification of the existing preculture minerals. Optimal synthesis and secretion of amelogenins were measured at physiological temperature (37°C). Effects of exposure to both temperatures below the physiological value were virtually reversible when explants were grown at physiological temperature (37°C) for another day. However, amelogenin secretion during this recovery period did not reach values as high as those found for the first day in explants initially grown at physiological temperature during the first day. We concluded from the four temperatures examined that the optimal temperature for enamel matrix deposition in vitro was 37°C. At this temperature enamel biosynthesis and its secretion are high. Lowering the temperature slows down the metabolism without any apparent harmful effect. Normal development of the tooth explants in vitro resumes when the culture temperature is restored to physiological levels (37°C). For temporary storage of tooth germ explants prior to any reimplantation, we therefore recommend a temperature of 6°C