177 research outputs found

    The Effects of Recreational Trail Design and Management Decisions on Northern Leopard Frog (Rana pipiens) Populations in an Urban Park

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    In addition to their original purpose as recreational areas, urban parks provide important habitats for species living in urban settings. Reconciling recreational and environmental goals is problematic, especially for park planners. RIM Park, in Waterloo, Ontario, is an example of this attempted reconciliation, where planners and managers attempted to conserve herpetofauna in a provincially significant wetland. However, this area includes a paved nature trail used by hikers, in-line skaters and cyclists and is adjacent to a golf course (which lies within the boundaries of the park). Herpetofauna breeding ponds were constructed and a series of culverts and clearspans included in order to provide reptiles and amphibians with safe passage under the trails. My objective was to determine whether these measures have been effective, whether the park sustains a viable population of Northern Leopard Frogs, and what factors influence frog populations in the park. Two spring field seasons involving mark and recapture techniques were attempted to estimate population sizes of Northern Leopard Frogs at RIM Park, as well as control sites. In both seasons, a control site was a cedar swamp 14 km to the west of the park within an Environmentally Sensitive Policy Area in Waterloo city limits affected by housing development and shared trails. Also within Waterloo city limits, a storm water management pond 8 km to the west was added in field season two. In 2005 (field season 1), because there was a serious drought almost no Northern Leopard Frogs were captured at the two sites examined ? RIM Park and the cedar swamp. In 2006, the more "normal" weather conditions revealed that RIM Park had significantly fewer Northern Leopard Frogs than either of the control sites. Given the lack of data in year 1, I compared the 2006 results to seven years of monitoring reports on RIM Park from consultants. The 2006 data were consistent with previous reports of small Northern Leopard Frog populations at RIM Park. Mark and recapture sessions revealed relatively low numbers, with a catch average of 4. 33 (SD = 1. 15). Calculations revealed an estimated population of 23 (SE = 13. 42). The highest number of observed Northern Leopard Frogs ever recorded at the same location in consulting reports is 5. It is likely that the ponds at RIM Park do not support breeding in Northern Leopard Frogs as the only adults caught were late in the season, during the last week of May, and adults likely were transients from the nearby wetlands and uplands. It is possible, given the historical monitoring data, that the Northern Leopard Frogs were long absent from RIM Park because of intensive farming activities that had replaced the wetlands, and that construction of the golf course and trails further precluded colonization. The lack of adult frogs in the breeding ponds and the lack of dead or injured frogs on the trails or golf course support the hypothesis that the trails are not presently causing frog mortality. It is possible that the frogs are avoiding recolonizing the trail and golf course area. It is also likely that the breeding ponds need to be deepened and only then will it be apparent whether the frogs will colonize the ponds, lay eggs, and use the clearspans and culverts. Recommendations include a shift in priorities to put the emphasis on restoration, a discussion of restoration options (including a possible restoration plan), possible improvements in amphibian monitoring techniques (such as reducing the reliance on audio methods), and general suggestions for urban park planning and management

    Encephalitis Lethargica, viral illness and the binary structures of the modern British health system c.1900-1975

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    In the early twentieth century, the modern British health system became structured in line with two sets of binary distinctions: between mental and physical, acute and chronic illness. According to some historians, this system was gradually transformed over the next decades through a series of changes in provision and policy, which integrated mental and general medicine and adopted a more progressive, humane approach to chronic illness. Challenging this narrative of integration and progress, this thesis shows and explains why over the twentieth century the modern British health system continued to conceptualise illness as either mental or physical, acute or chronic. During this period, members of the British medical and psychiatric profession positioned disease categories on either end of these binaries axes in order to connect them to specific provisions, resources and policies, to allocate medical care or financial support, and thus meet the needs of an increasingly comprehensive, yet often ill-equipped health system. In order to explore this contention, focus is on a specific group of illnesses which emerged and persisted for long periods of time after an acute viral event, often came into conflict with and thus from historical perspective expose these binary structures. Whilst this thesis explores how these illnesses were ultimately brought within categories aligned with the concepts of mental/physical and acute/chronic, it also highlights one important exception to this rule: Encephalitis Lethargica. Unable to align with these binaries, to be related to a series of practical decisions, and therefore fitted into the contemporary health system, this category therefore disappeared entirely. Given that these binaries endure and inform inequalities in our health system today, this thesis also hopes to provide an account of the past which helps us to better understand and critique circumstances in the present

    Where Have All the Children Gone? Community, Nature and the Child Friendly City

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    Most parents aspire to raise children who are independent, healthy and productive members of society. In this pursuit, parents struggle to balance freedom and safety. Current theory and research suggests that North American society has gone too far in the quest for safety and control, shielding children from necessary experiences. While confined in backyards and schools and spending increasing amounts of time in front of televisions and computers, children fail to build connections with the natural world and the wider community. In 1991, Canada ratified the United Nations’ Convention on the Rights of the Child. This convention grants children specific rights, ranging from the right to clean water to the right to be heard on issues that affect them. While Canadian children fare well on many of the requirements, they are rarely consulted on decisions that affect their well-being. Public spaces, beyond schools and playgrounds, are not designed for or with children. Children’s free time is restricted, and outdoor play takes place within confined areas. Children have limited access to natural areas, and are trained to fear and avoid these spaces. These trends are disturbing from physical, social and mental health perspectives, as well as that of long-term environmental sustainability. The UNICEF (United Nations Children’s Fund) program, Child Friendly Cities, offers guidelines for improving the way children are addressed at the municipal level. This research uses the City of Waterloo, Ontario, as a case study to document these issues and offer possible solutions. The research was designed to answer the following questions: “How do urban children perceive and interact with their communities?” “What is the relationship between children and the natural environment within urban settings?” “To what extent are children consulted or considered in community planning and decision-making?” and “Can the Child Friendly City model be used to re-connect children with the natural environment?” Fifty-four elementary school students were interviewed, asked to draw pictures of their neighbourhoods and to rate a series of local images. Results were combined with teacher and city official interviews, as well as analyses of strategy and policy documents. This study identifies ways in which Waterloo can help children connect with the natural world and become more active members of their communities. Overall, the research indicated that there are three main areas of concern: the child-nature interaction, the nature-community interaction and the child-community interaction. First, the child-nature interaction could be nurtured through improved access to nature. Children’s access to and use of nature in Waterloo is limited. Only 58.53% of students included a green element in neighbourhood drawings. Many children fear or are banned from natural green spaces. Outdoor education is decreasing, with some teachers avoiding field trips entirely. According to government procedures, children are not considered stakeholders of natural green spaces. Second, the nature-community interaction would improve with more consistent conservation and restoration efforts. While some city policies promote the acquisition and conservation or restoration of urban natural areas, others conflict with their intentions. Rapid development has led to a loss of opportunities for green space development. Third, the child-community interaction can be promoted by involving children in decision-making processes. There are no venues for children to participate in government. While older youth may participate in the Youth Recreation Council, there are no opportunities for younger children. Outreach is limited. Attention to these three main interactions would help the City of Waterloo become more child-, nature- and community- friendly. The UNICEF Child Friendly City program describes a set of goals and a framework that would support these interactions

    Shaping the future of learning using the student voice: we’re listening but are we hearing clearly?

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    Student voice data is a key factor as Manchester Metropolitan University strives to continually improve institutional technology enhanced learning (TEL) infrastructure. A bi-annual Institutional Student Survey enables students to communicate their experience of learning, teaching and assessment on programmes and specific units studied. Each cycle of the survey contains approximately 40–50,000 free text comments from students pertaining to what they appreciate and what they would like to see improved. A detailed thematic analysis of this data has identified 18 themes, arranged into six categories relating to the ‘Best’ aspects of courses, and 25 themes, arranged in seven categories in relation to aspects of courses considered to be ‘in need of improvement’. This student data was then used as a basis for semi-structured interviews with staff. Anecdotally, evidence suggested that student expectations and staff expectations around TEL and the virtual learning environment (VLE) differed. On-going evaluation of this work has highlighted a disconnect. In significant instances, academic colleagues seemingly misinterpret the student voice analysis and consequently struggle to respond effectively. In response to the analysis, the learning technologist's role has been to re-interpret the analysis and redevelop TEL staff development and training activities. The changes implemented have focused on: contextualising resources in VLE; making lectures more interactive; enriching the curriculum with audio–visual resources; and setting expectations around communications

    Adaptation to experimental jet-lag in R6/2 mice despite circadian dysrhythmia.

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    The R6/2 transgenic mouse model of Huntington's disease (HD) shows a disintegration of circadian rhythms that can be delayed by pharmacological and non-pharmacological means. Since the molecular machinery underlying the circadian clocks is intact, albeit progressively dysfunctional, we wondered if light phase shifts could modulate the deterioration in daily rhythms in R6/2 mice. Mice were subjected to four x 4 hour advances in light onset. R6/2 mice adapted to phase advances, although angles of entrainment increased with age. A second cohort was subjected to a jet-lag paradigm (6 hour delay or advance in light onset, then reversal after 2 weeks). R6/2 mice adapted to the original shift, but could not adjust accurately to the reversal. Interestingly, phase shifts ameliorated the circadian rhythm breakdown seen in R6/2 mice under normal LD conditions. Our previous finding that the circadian period (tau) of 16 week old R6/2 mice shortens to approximately 23 hours may explain how they adapt to phase advances and maintain regular circadian rhythms. We tested this using a 23 hour period light/dark cycle. R6/2 mice entrained to this cycle, but onsets of activity continued to advance, and circadian rhythms still disintegrated. Therefore, the beneficial effects of phase-shifting are not due solely to the light cycle being closer to the tau of the mice. Our data show that R6/2 mice can adapt to changes in the LD schedule, even beyond the age when their circadian rhythms would normally disintegrate. Nevertheless, they show abnormal responses to changes in light cycles. These might be caused by a shortened tau, impaired photic re-synchronization, impaired light detection and/or reduced masking by evening light. If similar abnormalities are present in HD patients, they may suffer exaggerated jet-lag. Since the underlying molecular clock mechanism remains intact, light may be a useful treatment for circadian dysfunction in HD

    Synovial membrane protein expression differs between juvenile idiopathic arthritis subtypes in early disease

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    Introduction: Juvenile idiopathic arthritis (JIA) is the most common rheumatological disease of childhood with a prevalence of around 1 in 1,000. Without appropriate treatment it can have devastating consequences including permanent disability from joint destruction and growth deformities. Disease aetiology remains unknown. Investigation of disease pathology at the level of the synovial membrane is required if we want to begin to understand the disease at the molecular and biochemical level. The synovial membrane proteome from early disease-stage, treatment naive JIA patients was compared between polyarticular and oligoarticular subgroups. Methods: Protein was extracted from 15 newly diagnosed, treatment naive JIA synovial membrane biopsies and separated by two dimensional fluorescent difference in-gel electrophoresis. Proteins displaying a two-fold or greater change in expression levels between the two subgroups were identified by matrix assisted laser desorption ionization-time of flight mass spectrometry with expression further verified by Western blotting and immunohistochemistry. Results: Analysis of variance analysis (P ≀ 0.05) revealed 25 protein spots with a two-fold or greater difference in expression levels between polyarticular and oligoarticular patients. Hierarchical cluster analysis with Pearson ranked correlation revealed two distinctive clusters of proteins. Some of the proteins that were differentially expressed included: integrin alpha 2b (P = 0.04); fibrinogen D fragment (P = 0.005); collagen type VI (P = 0.03); fibrinogen gamma chain (P = 0.05) and peroxiredoxin 2 (P = 0.02). The identified proteins are involved in a number of different processes including platelet activation and the coagulation system. Conclusions: The data indicate distinct synovial membrane proteome profiles between JIA subgroups at an early stage in the disease process. The identified proteins also provide insight into differentially perturbed pathways which could influence pathological events at the joint level

    Defective Mitochondrial Function In Vivo in Skeletal Muscle in Adults with Down's Syndrome: A P-31-MRS Study

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    Down’s syndrome (DS) is a developmental disorder associated with intellectual disability (ID). We have previously shown that people with DS engage in very low levels of exercise compared to people with ID not due to DS. Many aspects of the DS phenotype, such as dementia, low activity levels and poor muscle tone, are shared with disorders of mitochondrial origin, and mitochondrial dysfunction has been demonstrated in cultured DS tissue. We undertook a phosphorus magnetic resonance spectroscopy ((31)P-MRS) study in the quadriceps muscle of 14 people with DS and 11 non-DS ID controls to investigate the post-exercise resynthesis kinetics of phosphocreatine (PCr), which relies on mitochondrial respiratory function and yields a measure of muscle mitochondrial function in vivo. We found that the PCr recovery rate constant was significantly decreased in adults with DS compared to non-DS ID controls (1.7±0.1 min(−1) vs 2.1±0.1 min(−1) respectively) who were matched for physical activity levels, indicating that muscle mitochondrial function in vivo is impaired in DS. This is the first study to investigate mitochondrial function in vivo in DS using (31)P-MRS. Our study is consistent with previous in vitro studies, supporting a theory of a global mitochondrial defect in DS
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