Cognitive processing and posttraumatic growth after stroke.

OBJECTIVE: To examine whether posttraumatic growth (PTG) after stroke is associated with cognitive processing and psychological distress and whether time since stroke moderates relationships between these variables. METHOD: A sample of stroke survivors (N = 60) completed the Posttraumatic Growth Inventory, the Cognitive Processing of Trauma Scale and the Hospital Anxiety and Depression Scale. RESULTS: PTG correlated positively with four indicators of cognitive processing (i.e., positive cognitive restructuring, downward comparison, resolution, and denial) and negatively with depression. Time since stroke moderated a number of these relationships. As length of time since stroke increased, the relationships between PTG and anxiety and depression became more negative and significant, and the relationships between PTG and downward comparisons and resolution became more positive and significant. DISCUSSION: The findings indicate the possibility of PTG after stroke and suggest that cognitive processing is an important process for engendering such growth.

Cross-sectional and prospective associations between cognitive appraisals and posttraumatic stress disorder symptoms following stroke.

This study examined cross-sectional and prospective associations between cognitive appraisals and posttraumatic stress disorder (PTSD) symptoms following stroke. While in hospital, stroke patients (n=81) completed questionnaires assessing cognitive appraisals (i.e., negative cognitions about the self, negative cognitions about the world, and self-blame) and PTSD symptoms. PTSD symptoms were assessed again 3 months later when all patients had been discharged from hospital (n=70). Significant correlations were found between the time 1 measures of negative cognitions about the self and the world, but not self-blame, and the severity of PTSD symptoms measured at time 1 and at time 2. Regression analyses revealed that cognitive appraisals explained a significant amount of variance in the severity of PTSD symptoms at time 1, with negative cognitions about the self-emerging as a significant predictor. In contrast, time 1 cognitive appraisals were unable to explain additional variance in time 2 PTSD severity over and above that explained by time 1 PTSD severity. The findings therefore provide only weak support for Ehlers and Clark's cognitive model of PTSD.

Canada-wide standards and innovative transboundary air quality initiatives.

Canada's approach to air quality management is one that has brought with it opportunities for the development of unique approaches to risk management. Even with Canada's relatively low levels of pollution, science has demonstrated clearly that air quality and ecosystem improvements are worthwhile. To achieve change and address air quality in Canada, Canadian governments work together since, under the constitution, they share responsibility for the environment. At the same time, because air pollution knows no boundaries, working with the governments of other nations is essential to get results. International cooperation at all levels provides opportunities with potential for real change. Cooperation within transboundary airsheds is proving a fruitful source of innovative opportunities to reduce cross-border barriers to air quality improvements. In relation to the NERAM Colloquium objective to establish principles for air quality management based on the identification of international best practice in air quality policy development and implementation, Canada has developed, both at home and with the United States, interesting air management strategies and initiatives from which certain lessons may be taken that could be useful in other countries with similar situations. In particular, the Canada-wide strategies for smog and acid rain were developed by Canadian governments, strategies that improve and protect air quality at home, while Canada-U.S. transboundary airshed projects provide examples of international initiatives to improve air quality.

U.S.-Canada cooperation: the U.S.-Canada air quality agreement.

The impetus for the Canada-U.S. Air Quality Agreement was transboundary acid rain in eastern North America. This problem drove the parties to develop a bilateral agreement that not only addressed this issue, but also set up a broad and flexible framework to address other air quality problems. In 2000, the Ozone Annex to reduce smog and its precursor pollutants was negotiated. A transboundary particulate matter (PM) science assessment in 2004 led to the commencement of negotiation of a PM annex in late 2007. Over the course of 15 yr, Canada and the United States also developed innovative cooperative arrangements. Two transboundary airshed dialogues became important sources of practical on-the-ground cooperation in the Georgia Basin-Puget Sound and the Great Lakes Basin. In addition to providing the basis for ongoing international dialogue, these transboundary airshed projects resulted in changes to administrative practices as the parties exchange information and learn from each other in ways that benefit the airshed community. The nature of the Air Quality Agreement also enabled both Canada and the United States to address concerns each has had about specific pollutant sources and to address them in ways that avoided confrontation and resulted in air quality improvements for people living in the airsheds. Case studies of three of the "informal consultations" that have occurred under the agreement are described: where discussions occurred around a power plant in Michigan, a power plant in Saskatchewan, and a steel mill in Ontario. More than an agreement, this relationship has built a capacity to deal with common problems. Fostering such a relationship with its implicit transfer of knowledge and experience has opened doors for discussions on a new Clean Air framework in Canada and joint analyses of cross-border sulfur dioxide (SO2) and nitrogen oxides (NOx) emissions caps and trading. U.S. experience with cap and trading is highlighted for background and context. The flexibility inherent in the agreement provides a platform for future air quality issues and continued communication without borders.

Emotional adjustment to stroke: a group therapeutic approach.

Many people find it difficult to come to terms with having had a stroke and the resulting physical disability. This article reports on the setting up and running of psychological therapeutic groups to provide emotional and psychological support to patients about six months after their stroke. A flexible approach has allowed different groups to take different approaches to dealing with individuals' situations. Initial evaluations suggested that the groups help patients in the emotional processing of their experience of stroke and in promoting psychological adjustment to their changed circumstances. Group members have identified other gaps in service provision, such as a need for stroke education, and these gaps have been addressed.

Exploring the life cycles of three South American rusts that have potential as biocontrol agents of the stipoid grass Nassella neesiana in Australasia.

Three rusts, Puccinia nassellae, Uromyces pencanus, and Puccinia graminella, are being studied as potential biological control agents for Nassella neesiana (Chilean needle grass) in Australia and New Zealand. An understanding of the life cycle of a pathogen is desirable before its release as a biocontrol agent is considered, to enable the assessment of the risks involved in such a release. Field observations and experiments have been carried out to elucidate the life cycles of these three pathogens. Puccinia nassellae cycles as urediniospores and produces dormant teliospores. Dormancy of teliospores has been broken through manipulation in the laboratory, but resulting basidiospores have failed to infect N. neesiana plants under the conditions tested. Uromyces pencanus cycles as urediniospores and its telia appear to have lost the capacity to produce basidiospores. Aecia have been reported for this rust in the literature. However, evidence is provided that these aecia in fact belong to the life cycle of P. graminella. Puccinia graminella produces only aecia and telia. The aeciospores have been shown to be repetitive (aecidioid urediniospores). Teliospores germinate directly without a dormant phase, but resulting basidiospores failed to infect N. neesiana plants under the conditions tested. The role of teliospores in the life cycle of all three rusts remains unknown. Although the autoecious nature of their life cycles has not been proven experimentally, neither is there any evidence that they are heteroecious. Practical and theoretical implications of these findings are discussed.

Cognitive appraisals and posttraumatic stress disorder symptoms in informal caregivers of stroke survivors.

OBJECTIVE: To examine associations between cognitive appraisals (i.e., negative appraisals about the self, negative appraisals about the world, and self-blame) and the severity of posttraumatic stress disorder (PTSD) symptoms in informal caregivers (i.e., family relatives or close associates) of stroke survivors. METHOD: A cross-sectional study was conducted in which informal caregivers (N = 51) of recent stroke survivors completed the Posttraumatic Diagnostic Scale and the Posttraumatic Cognitions Inventory. RESULTS: PTSD symptom severity correlated significantly with the Posttraumatic Cognitions Inventory Self, World, and Self-Blame subscales and with time since stroke and age (negative relationship). Cognitive appraisals explained 58% of the variance in PTSD symptom severity. CONCLUSION: The associations found between negative cognitive appraisals and the severity of PTSD symptoms are consistent with current cognitive models of PTSD and the recommended use of trauma-related cognitive-behavioral therapy for individuals with PTSD.

Psychological correlates of PTSD symptoms following stroke.

This study assessed associations between a number of demographic, medical and psychological risk factors and post-traumatic stress disorder (PTSD) symptoms following stroke. Individuals (N = 102) who had experienced a stroke within the previous year participated in the study. Participants completed questionnaires containing measures of PTSD symptoms and a range of psychological risk factors (i.e., anxiety, depression, negative affect, dissociation, cognitive appraisals). Regression analyses revealed the variables under consideration were able to explain large proportions of the variance in the number (R(2) = .54, p < 0.001) and severity (R(2) = .58, p < 0.001) of PTSD symptoms. Number of strokes, negative affect and cognitive appraisals emerged as significant predictors of both the number and severity of PTSD symptoms. The present findings suggest that a significant proportion of stroke patients may benefit from the detection and treatment of PTSD symptoms.

Genetic diversity in the blackberry rust pathogen, Phragmidium violaceum, in Europe and Australasia as revealed by analysis of SAMPL.

Indigenous to Europe, the blackberry rust fungus Phragmidium violaceum was introduced to Australia and subsequently appeared in New Zealand, with the most recent authorised introductions to Australia specifically for the biological control of European blackberry. Markers for 'selective amplification of microsatellite polymorphic loci' (SAMPL) were developed for studying the population genetics of P. violaceum. Modification of one of the two SAMPL primers with a HaeIII adapter (H) revealed significantly greater levels of genetic variation than primers used to generate AFLPs, the latter revealing little or no variation among 25 Australasian and 19 European isolates of P. violaceum. SAMPL was used to describe genetic variation among these 44 isolates of P. violaceum from 51 loci generated using primer pairs (GACA)4 +H-G and R1+H-G. The European isolates were more diverse than Australasian isolates, with 37 and 22 % polymorphic loci, respectively. Cluster analysis revealed geographic clades, with Australasian isolates forming one cluster separated from two clusters comprising the European isolates. However, low bootstrap support at these clades suggested that Australian isolates had not differentiated significantly from European isolates since the first record of P. violaceum in Australia in 1984. In general, the results support two hypotheses. First, that the population of P. violaceum in Australia was founded from a subset of individuals originating from Europe. Second, that P. violaceum in New Zealand originated from the Australian population of P. violaceum, probably by wind dispersal of urediniospores across the Tasman Sea. The application of SAMPL markers to the current biological control programme for European blackberry is discussed.

Hippocratic explanations.

This paper considers VM's largely unrecognised contribution to a debate which spanned philosophy and medicine concerning the demands an adequate explanation must meet in the operation of a craft. VM's special contribution consists in indicating a means to an understanding of a mutual interdependence of theory and practice which acknowledges the strengths of a theoretical explanatory framework, but also recognises that practical success should inform that theory.