The relationship between phase and period responses to light pulses

Current theories of stable circadian entrainment postulate phase delays should be associated with period lengthening, while phase advances should be associated with period shortening. While characterising features of the rat PRC to light, we noted substantial numbers of responses that displayed the opposite pattern. Forty-eight rats provided data for 192 phase responses. Limiting our analysis to phase shifts greater than 1 hour, we found 44 displayed the expected predicted relationship, and 33 displayed the contrary paradoxical relationship. Paradoxical responders possessed significantly shorter initial activity periods, compared to predicted responders. Activity was significantly lengthened by paradoxical responders and shortened by predicted responders following light pulse exposure. These results suggest a second mode of stable entrainment. Additionally, these results indicate entrainment mode, predicted or paradoxical, is based upon activity period duration. Short activity period durations will be associated with paradoxical responses, long durations will be associated with predicted responses. We argue that, given the dynamic changes in photoperiod, both modes of entrainment are necessary to provide stable entrainment across the year.

An ecological study of the relationship between social and environmental determinants of obesity

There is growing concern with the increasing prevalence of obesity in industrialised countries, a trend that is more apparent in the poor than in the rich. In an ecological study, the relationship between an area measure of socioeconomic status (SES) and the density of fast-food outlets was examined as one possible explanation for the phenomenon. It was found that there was a dose-response between SES and the density of fast-food outlets, with people living in areas from the poorest SES category having 2.5 times the exposure to outlets than people in the wealthiest category. The findings are discussed.

The relationship between education and food consumption in the 1995 Australian national nutrition survey

Objective: To assess the relationship between education and the intake of a variety of individual foods, as well as groups of foods, for Australian men and women in different age groups.

Design: Cross-sectional national survey of free-living men and women. Subjects: A sample of 2501 men and 2739 women aged 18 years and over who completed the National Nutrition Survey (NNS) 1995.

Methods: Information about the frequency of consumption of 88 food items was obtained using a food-frequency questionnaire in a nation-wide nutrition survey. Irregular and regular consumers of foods were identified according to whether they consumed individual foods less than or more than once per month. The relationship between single foods and an index of education (no post-school qualifications, vocational, university) was analysed via contingency table chi-square statistics for men and women. Food group variety scores were derived by assigning individual foods to conventional food group taxonomies, and then summing the dichotomised intake scores for individual foods within each food group. Two-way analyses of variance (education by age groups) were performed on food variety scores for men and women, separately.

Results: While university-educated men and women consumed many individual foods more regularly than less-educated people, they were less likely to be regular consumers of several meat products. The relationship between education and food consumption was less apparent when individual food scores were aggregated into food group scores. University-educated men and women exhibited higher scores on total food group variety than the other educational groups.

Conclusions: Higher education is associated with the regular consumption of a wider variety of foods. Aggregation of individual food consumption indices into food variety scores may mask the apparent effects of educational background on food consumption.

The relationship between residence and the pharmacological management of challenging behavior in individuals with intellectual disability

Many individuals with intellectual disability are administered psychotropic drugs to manage their challenging behavior. The increased relocation of individuals from institutions into community-based accommodation during the past decade provides an opportunity to examine the relationship between setting and drug administration. This study provides acomparison of drug use according to the type of residential facility of 873 individuals reported to have been administered drugs for behavioral restraint in March 2000, with 762 individuals reported in March 1993. In 2000, individuals in institutions were reported toreceive a moderately greater number of drugs concurrently than those in the community. However, there were no differences in the proportion of individuals prescribed drugs relative to the total population living in the respective settings. This is in contrast to the findings from 1993, where drug use was greater in individuals who were living in institutions. It was also more common for individuals who continued to be medicated across time to have previously lived in an institution. Although relocation into the community may be associated with improved living conditions, it is important to recognize that this change in living conditions is not necessarily associated with less use of drugs to manage behavior.

A new relationship between planning and democracy? Urban activism in Melbourne 1965-1975

This paper is a reflective overview of urban social protest in the years 1965-1975 and its influence on post-war planning, especially on models of public participation in planning, and conceptions of effective local democracy. Drawing extensively on a major study of urban activism in Melbourne, Australia, the paper discusses the political and organisational strategies used by activists in Melbourne’s inner city areas to resist the large-scale planning/urban renewal projects especially of the Victorian state government. The paper focuses on Melbourne’s inner city Residents’ Action Groups and examines their motivations, strategies and rationales, placing them within an international context of urban protest movements demanding local democracy and consultation. The paper concludes that the Melbourne urban protest movements of the late 60s and early 70s deserve recognition for their contribution to inclusive, consultative processes in planning decision-making. This is done within a context of questioning contemporary academic discussion around the interpretative concept of gentrification, widely and indiscriminately applied to this and later periods of urban change.

Relationship between genotype and enzyme activity of glutathione S-transferases M1 and P1 in Chinese

Glutathione S-transferases (GSTs) are the major detoxifying Phase II enzyme for eliminating electrophilic compounds. Mutations in GSTM1, GSTP1 and GSTT1 in Caucasian and GSTA1 in Chinese have been found to reduce enzyme activity. However, data on the impact of common genetic polymorphisms of GSTM1 and GSTP1 on enzyme activity in Chinese is lacking. This study aimed to investigate the effect of common GSTP1 and GSTM1 polymorphisms on erythrocyte GST activity in healthy Chinese (n = 196). GSTM1 null mutation (GSTM1*0) was analyzed by a PCR-Multiplex procedure, whereas GSTP1 313A → G polymorphism (resulting in Ile105Val at codon 105) was analyzed by PCR-restriction fragment length polymorphism (RFLP) analysis. Erythrocyte GST activity was measured using 1-chloro-2,4-dinitro-bezene (CDNB) as the model substrate. The frequency of GSTM1 null genotype was 54.3% and the frequency of GSTP1-Ile/Ile, -Ile/Val, and -Val/Val genotype was 60.7%, 35.2% and 4.1%, respectively, with a frequency of 21.7% for the 105 valine allele. Age, gender and smoking did not significantly affect the erythrocyte GST activities. The mean erythrocyte GST enzyme activity for GSTP1*-Ile/Val genotype group (3.53 ± 0.63 U/g Hb) was significantly lower than that for subjects with GSTP1-Ile/Ile genotype (4.25 ± 1.07 U/g Hb, P = 0.004), while subjects with the GSTP1-Val/Val genotype had the lowest enzyme activity (2.44 ± 0.67 U/g Hb). In addition, the GST activity in carriers of GSTM1*0/GSTP1-Ile/Ile was significantly higher than that of subjects inherited GSTM1*0/GSTP1-Ile/Val or GSTM1*0/GSTP1-Val/Val. However, there is no association between GSTM1 null mutation and reduced enzyme activity. GSTP1 codon 105 mutation led to reduced erythrocyte GST activity in Chinese. A combined GSTP1 and GSTM1 null mutations also resulted in significantly reduced GST activity. Further studies are needed to explore the clinical implications of GSTM1 and GSTP1 polymorphisms.

Building a symbiotic relationship between academia and industry: expectations and observations of construction management graduates

Construction management graduates are employed in job functions such as building and civil engineering contracting, construction and project management consulting, client organisations (public and private) and developer organisations. Considering the diversity of employment opportunities for construction management graduates, they increasingly need to have a portfolio of skills to work effectively and efficiently with other professions in the industry. In exploring this, the objective of the research presented in this paper is to determine if construction management graduates are meeting the expectations of their employers. In considering the competitive forces impacting the construction industry, the authors of this paper sought to establish whether construction managers are able to identify those key skills needed for the future success of the industry. In turn, this information is considered critical for the successful formulation of curricula. Therefore, to establish whether construction management graduates are meeting the expectations of contractors, a survey was distributed to managers to establish their expectations and observations of recent graduates. The survey results indicate that managers are generally satisfied with the skill level of graduate students. The survey also highlighted several important skills that were considered to be lacking in graduates. cknowledging that there is always a need to improve the skill level of graduates, the authors propose a number of recommendations that are considered to improve the content construction management curricula.

Altered experience mediates the relationship between schizotypy and mood disturbance during shamanic-like journeying

Studies have found that shamanic practices are associated with statistically significant reductions in mood disturbance relative to baseline. However, contrary results were obtained for non-shamanic practitioners exposed to shamanic-like techniques. These inconsistent results may be partially due to a personality trait referred to as schizotypy, which has been demonstrated to influence susceptibility to shamanic-like techniques. Furthermore, given that an integral feature of shamanism is the production of altered states of awareness and altered experiences, and that shamanism is associated with health benefits, perhaps the production of such alterations affects health benefits. Consequently, the present study aimed to investigate whether altered state of awareness and altered experience mediated the association between schizotypy and mood disturbance during exposure to a shamanic-like condition. Sixty-nine non-shamans were randomly assigned to one of two conditions: shamanic-like journeying with drumming or sitting quietly with eyes open. Total mood disturbance-change was significantly negatively correlated with schizotypy and altered experience -- but not altered state of awareness -- and these correlations were significantly stronger for the shamanic-like journeying condition relative to the control condition. Furthermore, altered experience significantly mediated the association between schizotypy and total mood disturbance-change during exposure to shamanic-like journeying.

The relationship between dissociation and binge eating

Despite research findings demonstrating a relationship between dissociation and binge eating, the psychological processes that may underlie this association remain unclear. The present study examined 2 potential explanations: (a) that dissociation disinhibits behavioral control over eating and (b) that dissociation interferes with self-awareness and undermines body image. A total of 151 female university students completed measures of dissociation, body dissatisfaction, impulsivity, internalization of the thin ideal, body comparison, and binge eating. Correlations confirmed the presence of a relationship between dissociation and binge eating, and regression analyses revealed that this relationship is limited to body-specific (somatic) symptoms of dissociation. Path analyses identified body dissatisfaction, comparison, and impulsivity as significant mediators of this relationship. However, inclusion of all 3 mediated paths in a full model revealed that only body dissatisfaction is a unique mediator. The relevance of somatic symptoms, and the unique contribution of body dissatisfaction as a mediator, are consistent with an explanation of the relationship between dissociation and binge eating that is based on a vulnerability of body image. The results emphasize the need for future research to consider the relation of dissociation to a broader range of disordered eating symptoms than simply binge eating.

Does subjective well-being show a relationship between parents and their children?

The relationship between the subjective well-being of parents and their own 12–16-year-old children was explored in a Spanish sample of N = 266 families. A positive relationship was expected due to both a shared environment and the possibility of the genetic transmission of subjective well-being ‘set-points’. A positive significant relationship was found for the summated scale of satisfaction domains forming the Personal Well-being Index, and for the specific domains of health and security for the future. However, no relationship was found for the other five domains that make up this Index or for satisfaction with life as a whole. We conclude while these results provide some evidence for the expected influence of a shared environment, they have failed to provide evidence for high heritability of set-points for subjective well-being.