Ephelides are More Related to Pigmentary Constitutional Host Factors than Solar Lentigines

Ephelides and solar lentigines are benign pigmented spots, which are currently associated with an increased risk of skin cancer. These two pigmented spots are known to be discriminated by their clinical, histological, and electron microscopic characteristics, even though occasional misclassification can occur because of their similarity. It has also been questioned whether these spots are not one and the same. In this study, we have attempted to differentiate between these two pigmented spots with the use of a standardized protocol for clinical examinations on 272 healthy volunteers, paying particular consideration to their pigmentary and constitutional host factors. We found that solar lentigines 1) are more prevalent than ephelides, 2) increase in prevalence and number with higher age, and 3) are most prevalent on the trunk and occur more frequently in males than in females. A trend is also observed whereby ephelides 1) loose their prevalence with age, 2) become equally distributed on the face, arms, and trunk, and 3) occur more frequently in females. An intimate association of ephelides, but not solar lentigines, has been found with hair color and skin type. All of these findings are in agreement with most of those reported in the literature, supporting the view that ephelides and solar lentigines are different types of pigmented lesions.     

Methods of sampling aquatic beetles in the transitional habitats at water margins

Populations of water-beetles (Hydrophiloidea) were studied during the ice-free seasons of 2 years at a lake shore near Stockholm, Sweden. They were sampled by means of an absolute quantitative method (twenty-four bottom cores/sample), extracted by Berlese-Tullgren funnels, and a relative searching method (time-catch or catch per unit effort). The sampling efficiency was tested by charging empty samples with known numbers of beetles. ‘Smaller’ species were less efficiently extracted than ‘larger’ ones. Absolute and relative population estimates of eight species were compared by means of regression analysis, the relative estimate being considered as the dependent variable. Only three statistically significant correlations were found, but a correlation always seemed to exist, and the relative estimates are considered as crude estimates. To obtain better ones when studying several species in one habitat much work is required, and then the advantages of the simple relative method disappears. The different sizes of the species were evaluated as sources of errors affecting the relative estimates. The estimates of the 'smaller’ species were more affected than the ‘larger’ ones. It is considered that relative population estimates would gain much if compared with independent absolute estimates. This seems to have been done rarely with invertebrates in aquatic habitats. Further, it is thought that behavioural extraction methods might be applied to several aquatic animal groups in eulittorals and littorals, saving much time compared with mechanical methods or hand sorting.     

The effects of temperature and body size on the mating pattern of a gregariously nesting bee, Colletes cunicularius (Hymenoptera: Colletidae)

Abstract. 1. In a 3-year study of the solitary bee Colletes cunicularius L. in Sweden, average body size and population density fluctuated greatly between years.
2. In this protandrous population, females mated just once and the sex ratio was slightly male biased. Males were smaller than females.
3. Size assortative mating (homogamy), associated with an increase in population density during the central days of female emergence and mating, was observed in two out of three years. Homogamy was also observed in pairs with remating males.
4. Most of the mating males had emerged the day they mated, but 42% were older. We found no support for a general large-male mating advantage.
5. Weight of emerging females and mating males were negatively correlated with ground temperature, indicating thermoregulatory influence on the process of sexual selection in this species.     

Odour stimuli affecting autumn migration of Rhopalosiphum padi (L.) (Hemipter: ornoptera)

R. padi gynoparae settling in the canopy of the winter host, Prunus padus, tended to form aggregations. Differences in the degree of exposure to wind, sun, etc., did not satisfactorily explain the aggregated pattern observed. In laboratory experiments, aphids did not distinguish between leaves taken from nearby aggregations and leaves taken far away from aggregations. The results of laboratory olfactometer tests and field trapping studies indicate that R. padi gynoparae produce an aggregation pheromone. Thus the aggregated settling pattern of gynoparae of R. padi can best be explained as a response to an aggregation pheromone.     

MORAL EXPERTISE: A PROBLEM IN THE PROFESSIONAL ETHICS OF PROFESSIONAL ETHICISTS

Philosophers, particularly moral philosophers, are increasingly being involved in public decision-making in areas which are seen to raise ethical issues. For example, Dame Mary Warnock chaired the ‘Committee of Inquiry into Human Fertilization and Embryology’ in the UK in 1982–4; the Philosophy Department at Auckland was commissioned by the Auckland Regional Authority to report on the ethical aspects of fluoridating the public water supply in 1990; and many of us are serving on ethics committees of various sorts. Not only are philosophers actually being called on or consulted, but many of us would argue that a philosophical contribution in such areas is essential. The involvement of moral philosophers in public policy decisions raises a question of professional ethics, viz, what role should a philosopher's own moral perspective or judgements play in the advice s/he gives, or contribution s/he makes, to public decision-making on ethical issues. Like most problems in professional ethics, this prompts reflection on the nature of the profession, and in particular on the expertise we take moral philosophy to offer. It also prompts reflection on how processes of public decision making in ethically problematic areas should be understood. I explore these issues in this paper.