2,858 research outputs found

    The frequency and properties of young tidal dwarf galaxies in nearby gas-rich groups

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    We present high-resolution Giant Metrewave Radio Telescope (GMRT) HI observations and deep Canada-France-Hawaii Telescope (CFHT) optical imaging of two galaxy groups: NGC 4725/47 and NGC 3166/9. These data are part of a multi-wavelength unbiased survey of the gas-rich dwarf galaxy populations in three nearby interacting galaxy groups. The NGC 4725/47 group hosts two tidal knots and one dIrr. Both tidal knots are located within a prominent HI tidal tail, appear to have sufficient mass (M_gas~10^8 M_sol) to evolve into long-lived tidal dwarf galaxies (TDGs) and are fairly young in age. The NGC 3166/9 group contains a TDG candidate, AGC 208457, at least three dIrrs and four HI knots. Deep CFHT imaging confirms that the optical component of AGC 208457 is bluer -- with a 0.28 mag g-r colour -- and a few Gyr younger than its purported parent galaxies. Combining the results for these groups with those from the NGC 871/6/7 group reported earlier, we find that the HI properties, estimated stellar ages and baryonic content of the gas-rich dwarfs clearly distinguish tidal features from their classical counterparts. We optimistically identify four potentially long-lived tidal objects associated to three separate pairs of interacting galaxies, implying that TDGs are not readily produced during interaction events as suggested by some recent simulations. The tidal objects examined in this survey also appear to have a wider variety of properties than TDGs of similar mass formed in current simulations of interacting galaxies, which could be the result of pre- or post-formation environmental influences.Comment: 18 pages, 14 figures, accepted for publication in MNRA

    OCS Title and Current MMS Regulatory Matters

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    In this paper, we attempt to set-forth our current thoughts on certain unique aspects of title to oil and gas leases on the Outer Continental Shelf ( OCS ) and attempt to encapsulate and comment upon certain of the current federal regulations applicable to leasing for the exploration and production of oil and gas in the Gulf of Mexico ( GOM )

    How can diagnostic assessment programs be implemented to enhance inter-professional collaborative care for cancer?

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    BackgroundInter-professional collaborative care (ICC) for cancer leads to multiple system, organizational, professional, and patient benefits, but is limited by numerous challenges. Empirical research on interventions that promote or enable ICC is sparse so guidance on how to achieve ICC is lacking. Research shows that ICC for diagnosis could be improved. Diagnostic assessment programs (DAPs) appear to be a promising model for enabling ICC. The purpose of this study was to explore how DAP structure and function enable ICC, and whether that may be associated with organizational and clinical outcomes.MethodsA case study approach will be used to explore ICC among eight DAPs that vary by type of cancer (lung, breast), academic status, and geographic region. To describe DAP function and outcomes, and gather information that will enable costing, recommendations expressed in DAP standards and clinical guidelines will be assessed through retrospective observational study. Data will be acquired from databases maintained by participating DAPs and the provincial cancer agency, and confirmed by and supplemented with review of medical records. We will conduct a pilot study to explore the feasibility of estimating the incremental cost-effectiveness ratio using person-level data from medical records and other sources. Interviews will be conducted with health professionals, staff, and referring physicians from each DAP to learn about barriers and facilitators of ICC. Qualitative methods based on a grounded approach will be used to guide sampling, data collection and analysis.DiscussionFindings may reveal opportunities for unique structures, interventions or tools that enable ICC that could be developed, implemented, and evaluated through future research. This information will serve as a formative needs assessment to identify the nature of ongoing or required improvements, which can be directly used by our decision maker collaborators, and as a framework by policy makers, cancer system managers, and DAP managers elsewhere to strategically plan for and implement diagnostic cancer services

    Mental health treatment: Reaching more kids

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    Background: Nearly 70% of children who are in need of specialized mental health services do not access them. We set out to identify effective self-delivered interventions as a way to help bridge the gap between those in need and those being serviced. Methods: We used systematic review methods to identify randomized control trials (RCTs) evaluating self-delivered treatments. After applying our rigorous inclusion criteria, we accepted five RCTs evaluating five treatment interventions. Results: Three self-directed family interventions reduced anxiety diagnoses and symptoms for school age children. One self-directed parenting intervention reduced ADHD diagnoses for school age children. Additionally, one self-directed youth invention reduced depression symptoms for adolescents. Conclusions: Strong research evidence supports the use of self-directed treatments to address three common childhood mental disorders. Greater use of these interventions can expand the number of children who are reached with effective treatments

    The influence of 'significant others' on persistent back pain and work participation: a qualitative exploration of illness perceptions

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    Background Individual illness perceptions have been highlighted as important influences on clinical outcomes for back pain. However, the illness perceptions of 'significant others' (spouse/partner/close family member) are rarely explored, particularly in relation to persistent back pain and work participation. The aim of this study was to initiate qualitative research in this area in order to further understand these wider influences on outcome. Methods Semi-structured interviews based on the chronic pain version of the Illness Perceptions Questionnaire-Revised were conducted with a convenience sample of UK disability benefit claimants, along with their significant others (n=5 dyads). Data were analysed using template analysis. Results Significant others shared, and perhaps further reinforced, claimants' unhelpful illness beliefs including fear of pain/re-injury associated with certain types of work and activity, and pessimism about the likelihood of return to work. In some cases, significant others appeared more resigned to the permanence and negative inevitable consequences of the claimant's back pain condition on work participation, and were more sceptical about the availability of suitable work and sympathy from employers. In their pursuit of authenticity, claimants were keen to stress their desire to work whilst emphasising how the severity and physical limitations of their condition prevented them from doing so. In this vein, and seemingly based on their perceptions of what makes a 'good' significant other, significant others acted as a 'witness to pain', supporting claimants' self-limiting behaviour and statements of incapacity, often responding with empathy and assistance. The beliefs and responses of significant others may also have been influenced by their own experience of chronic illness, thus participants lives were often intertwined and defined by illness. Conclusions The findings from this exploratory study reveal how others and wider social circumstances might contribute both to the propensity of persistent back pain and to its consequences. This is an area that has received little attention to date, and wider support of these findings may usefully inform the design of future intervention programmes aimed at restoring work participation

    Preventing and Treating Childhood Mental Disorders: Effective Interventions

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    Background: Social and emotional wellbeing is a crucial resource for all children. Yet high-quality epidemiological studies suggest that 12.7% of children will experience a mental disorder.  Methods: We used systematic review methods to identify 113 randomized controlled trials and six systematic reviews on effective interventions for preventing and treating the most common childhood mental disorders.  Results: We found effective prevention interventions for anxiety disorders, attention-deficit/hyperactivity disorder, oppositional defiant and conduct disorders, depression, eating disorder and posttraumatic stress disorder. In addition to identifying useful treatments for all of these disorders, we also found effective treatments for autism spectrum, obsessive-compulsive and bipolar disorders as well as schizophrenia.  Conclusions: Mental disorders, which typically start in childhood, cause significant distress and impairment for children. Beyond the hardships they cause for children and families, there are also significant avoidable costs for society as a whole. By implementing effective prevention interventions and treatments for these concerns, it is possible to avert unnecessary hardships for young people, their families and their communities

    The identification of research priorities for UK occupational therapists in work rehabilitation

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    Background/Aims: UK occupational therapists are recognised as having key skills in work rehabilitation, but there is limited evidence to underpin this. In order to use research resources to best effect, it is vital to identify the research priorities of occupational therapists in work rehabilitation. This study aims to gather the views of those with a special interest in the field in order to identify their research priorities. Methods: An online survey was developed and administered electronically to members (n=173) of the College of Occupational Therapists Specialist Section-Work (COTSS-Work). Respondents were asked to: i) prioritise and comment on research areas; ii) propose research questions. A final sample of 42 surveys was collected and analysed thematically Results: Responses reflected the diversity and complexity of work rehabilitation. Identifying a rank order of research priorities proved challenging as the majority (≄62%) of respondents considered all of the topic areas listed a high priority. Research into the following areas were included in the survey: interventions; outcome measurements; assessments; management and/or service delivery; planning and/or commissioning; and education. However, 'interventions' was rated highest overall. Conclusions: Occupational therapists in the UK need more evidence to justify their role in the work and health arena. Greater opportunities are required for occupational therapists in clinical practice, as well as those involved in research, to address areas in which evidence-based practice is lacking and the mechanisms to disseminate this knowledge base
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