Variables affecting first-year student commitment during the transition to college in Ireland.

Third-level student attrition rates internationally are a cause for concern. Thus, student retention and academic success are top priorities for colleges, and students alike. In addition to this, student well-being is a growing public health concern. This study explores the need to incorporate well-being as a predictor in traditionally academically focused models of student persistence during the transition to college. A cross-sectional web-based survey was conducted with 574 first-year students aged 17-22 years attending a university in Ireland to examine the effect of student persistence and well-being variables on student commitment during the transition to college. This study highlights the connection between student academic, social and well-being variables during the transition to college within the fitted models that emerged from the data. Student well-being plays a key role ensuring student persistence during the transition to college. The results support our hypothesis that many student variables have the potential to substantially impact student commitment during the first-year transition to college. These variables include student depression, self-rated health, academic environment, peer connections and perceiving the academic programme to be an appropriate personal choice. It is therefore important for education institutions to acknowledge and address student persistence and student well-being in an integrative way and for traditionally academically focused student retention models to orientate to incorporate student well-being.

Microplastic Ingestion by Gelatinous Zooplankton May Lower Efficiency of the Biological Pump.

The impacts of microplastics on some individual organisms have been well studied but what is less clear is what impacts microplastics have on wider ecosystem processes. Using salps as model organisms, we studied the effect of microplastic ingestion on the downward flux of high-density particulate organic matter in the form of salp faecal pellets. While to date most microplastic studies used virgin microplastics at unrealistic environmental concentrations here we exposed Salpa fusiformis to fractured and UV exposed polyethylene and polystyrene microplastics possessing a biofilm. It was found that when exposed to environmentally relevant concentrations, reported for the Mediterranean and the South Pacific Gyre, only few faecal pellets had microplastics incorporated within them. Under potential future scenarios, however, up to 46% of faecal pellets contained microplastics. Incorporated microplastics significantly altered the size, density and sinking rates of salp faecal pellets ( p-value < 0.05 in each instance). Sinking rates decreased by 1.35-fold (95% CI = 1.18, 1.56) for faecal pellets with polyethylene microplastics and 1.47-fold (95% CI = 1.34, 1.61) for polystyrene. These results suggest that today, microplastic ingestion by salps has minimal impact on the biological pump. However, under future microplastic concentrations (or in areas such as convergent zones), microplastics may have the potential to lower the efficiency of the biological pump.

National scale assessment of total trihalomethanes in Irish drinking water.

Ireland reported the highest non-compliance with respect to total trihalomethanes (TTHMs) in drinking water across the 27 European Union Member States for the year 2010. We carried out a GIS-based investigation of the links between geographical parameters and catchment land-uses with TTHMs concentrations in Irish drinking water. A high risk catchment map was created using peat presence, rainfall (>1400 mm) and slope (<5%) and overlain with a map comprising the national dataset of routinely monitored TTHM concentrations. It appeared evident from the map that the presence of peat, rainfall and slope could be used to identify catchments at high risk to TTHM exceedances. Furthermore, statistical analyses highlighted that the presence of peat soil with agricultural land was a significant driver of TTHM exceedances for all treatment types. PARAFAC analysis from three case studies identified a fluorophore indicative of reprocessed humic natural organic matter as the dominant component following treatment at the three sites. Case studies also indicated that (1) chloroform contributed to the majority of the TTHMs in the drinking water supplies and (2) the supply networks contributed to about 30 µg L-1 of TTHMs.

Ptaquiloside in Irish Bracken Ferns and Receiving Waters, with Implications for Land Managers.

Ptaquiloside, along with other natural phytotoxins, is receiving increased attention from scientists and land use managers. There is an urgent need to increase empirical evidence to understand the scale of phytotoxin mobilisation and potential to enter into the environment. In this study the risk of ptaquiloside to drinking water was assessed by quantifying ptaquiloside in the receiving waters at three drinking water abstraction sites across Ireland and in bracken fronds surrounding the abstraction sites. We also investigated the impact of different management regimes (spraying, cutting and rolling) on ptaquiloside concentrations at plot-scale in six locations in Northern Ireland, UK. Ptaquiloside concentrations were determined using recent advances in the use of LC-MS for the detection and quantification of ptaquiloside. The results indicate that ptaquiloside is present in bracken stands surrounding drinking water abstractions in Ireland, and ptaquiloside concentrations were also observed in the receiving waters. Furthermore, spraying was found to be the most effective bracken management regime observed in terms of reducing ptaquiloside load. Increased awareness is vital on the implications of managing land with extensive bracken stands.

Six weeks of Pilates improved functional mobility, postural balance and spatiotemporal parameters of gait to decrease the risk of falls in healthy older adults.

OBJECTIVE: To determine the effectiveness of Pilates exercises on falls risk factors. DESIGN: Prospective cohort, pre-test post-test study. Participants were selected using convenience and snowballing sampling. Pilates classes were held twice weekly for six weeks (1-h sessions) with a supplementary home programme. METHODS: A test of cognitive function, the Montreal Cognitive Assessment (MOCA), was employed to determine eligibility for inclusion. The following fall-predictor variable measures were employed: the 16 item Falls Efficacy Scale (FES), the short International Physical Activity Questionnaire (IPAQ), the Functional Reach Test (FRT), the Timed Up and Go (TUG), the GAITRite® system, Platform FOOTWORKpro. Multivariate analysis ANOVA with time as within subject factor was used to test for differences between pre and post-test scores adjusted for the factor Pilates. RESULTS: twenty-seven participants completed the study, mean age = 70.4 (SD = 4.5). After adjusting for the effect of the factor Pilates "previous experience or no previous experience of Pilates", statistically significant differences were identified in the following domains: The TUG (p < 0.001), FRT (p < 0.001), velocity, swing and stance time and the Mediolateral sway (p < 0.05). A significant difference was found between pre and post-test for anteroposterior sway in those with experience of Pilates (p < 0.05) and interaction between time and Pilates experience in Physical Activity (p < 0.05). CONCLUSION: Findings suggest that functional mobility, mobility, spatiotemporal parameters of gait, postural balance and physical activity improved in healthy older adults after 6 weeks of Pilates with a supplementary home programme.

Tracing sources of natural organic matter, trihalomethanes and metals in groundwater from a karst region.

Groundwater offers an important source for drinking water around the world; however, groundwater quality is under increasing pressure and is particularly vulnerable in karst areas. Total organic carbon (TOC) is significantly related to groundwater quality and when not removed by water treatment processes can give rise to the formation of disinfection by-products trihalomethanes (THMs) above the level of compliance. This study investigated the source of organic matter giving rise to the THM exceedances in a groundwater supply in a karst area. Results highlighted that source water for this groundwater supply was prone to surface water infiltration linked to rainfall events; was not accurately captured in the zone of contribution (ZoC); had inadequate treatment of natural organic matter (NOM) and suffered THM exceedances in 45% of sampling events. THMs were mostly represented by chloroform and caused by terrestrial delivered reprocessed organic matter. This work will support water managers tasked with decision-making.

Using mental mapping to unpack perceived cycling risk.

Cycling is the most energy-efficient mode of transport and can bring extensive environmental, social and economic benefits. Research has highlighted negative perceptions of safety as a major barrier to the growth of cycling. Understanding these perceptions through the application of novel place-sensitive methodological tools such as mental mapping could inform measures to increase cyclist numbers and consequently improve cyclist safety. Key steps to achieving this include: (a) the design of infrastructure to reduce actual risks and (b) targeted work on improving safety perceptions among current and future cyclists. This study combines mental mapping, a stated-preference survey and a transport infrastructure inventory to unpack perceptions of cycling risk and to reveal both overlaps and discrepancies between perceived and actual characteristics of the physical environment. Participants translate mentally mapped cycle routes onto hard-copy base-maps, colour-coding road sections according to risk, while a transport infrastructure inventory captures the objective cycling environment. These qualitative and quantitative data are matched using Geographic Information Systems and exported to statistical analysis software to model the individual and (infra)structural determinants of perceived cycling risk. This method was applied to cycling conditions in Galway City (Ireland). Participants' (n=104) mental maps delivered data-rich perceived safety observations (n=484) and initial comparison with locations of cycling collisions suggests some alignment between perception and reality, particularly relating to danger at roundabouts. Attributing individual and (infra)structural characteristics to each observation, a Generalised Linear Mixed Model statistical analysis identified segregated infrastructure, road width, the number of vehicles as well as gender and cycling experience as significant, and interactions were found between individual and infrastructural variables. The paper concludes that mental mapping is a highly useful tool for assessing perceptions of cycling risk with a strong visual aspect and significant potential for public participation. This distinguishes it from more traditional cycling safety assessment tools that focus solely on the technical assessment of cycling infrastructure. Further development of online mapping tools is recommended as part of bicycle suitability measures to engage cyclists and the general public and to inform 'soft' and 'hard' cycling policy responses.

Child car seats - a habitat for house dust mites and reservoir for harmful allergens.

INTRODUCTION AND OBJECTIVE: House dust mites produce allergens which can cause or aggravate diseases such as asthma, eczema and rhinitis. The objectives of this study are to quantify typical house dust mite and Der p 1 allergen levels in child car seats, and to determine external variables that may influence mite populations in cars. MATERIALS AND METHODS: Dust samples were collected from the child car seats and driver seats of 106 cars using a portable vacuum sampling pump over a two minute sampling period. Mites were counted and identified and results were expressed as mites per gram (mites/g) of dust, while Der p 1 content of samples were measured by enzyme-linked immunosorbent assay (ELISA). Questionnaires were completed by participants to identify environmental and behavioural effects on mite populations. Results were analysed using General Linear Model (GLM) procedures. RESULTS: Twelve species of mites, of which nine are known to produce harmful allergens, were recorded from 212 dust samples. Over 80% of drivers' seats and over 77% of child car seats harboured dust mites with a significant correlation (p = 0.001) between the mites/g of dust and Der p 1 content recovered from each seat. A mean of 53 mites/g of dust per seat was recovered, with a mean Der p 1 level of 1.1µg/g. Over 12% of driver seats and 15% of child car seats contained house dust mite levels sufficient to be risk factors for sensitisation and allergic reactions. CONCLUSIONS: Child car seats and driver seats are habitats to a range of mite species which can be present in sufficient concentrations to cause or aggravate allergen related illnesses in individuals who are genetically predisposed.

Functional responses and adaptation of mesophilic microbial communities to psychrophilic anaerobic digestion.

Psychrophilic (<20°C) anaerobic digestion (AD) represents an attractive alternative to mesophilic wastewater treatment. In order to investigate the AD microbiome response to temperature change, with particular emphasis on methanogenic archaea, duplicate laboratory-scale AD bioreactors were operated at 37°C followed by a temperature drop to 15°C. A volatile fatty acid-based wastewater (composed of propionic acid, butyric acid, acetic acid and ethanol) was used to provide substrates representing the later stages of AD. Community structure was monitored using 16S rRNA gene clone libraries, as well as DNA and cDNA-based DGGE analysis, while the abundance of relevant methanogens was followed using qPCR. In addition, metaproteomics, microautoradiography-fluorescence in situ hybridization, and methanogenic activity measurements were employed to investigate microbial activities and functions. Methanomicrobiales abundance increased at low temperature, which correlated with an increased contribution of CH4 production from hydrogenotrophic methanogenesis at 15°C. Methanosarcinales utilized acetate and H2/CO2 as CH4 precursors at both temperatures and a partial shift from acetoclastic to hydrogenotrophic methanogenesis was observed for this archaeal population at 15°C. An upregulation of protein expression was reported at low temperature as well as the detection of chaperones indicating that mesophilic communities experienced stress during long-term exposure to 15°C. Overall, changes in microbial community structure and function were found to underpin the adaptation of mesophilic sludge to psychrophilic AD.

Long-term otological outcome of hamular fracture during palatoplasty.

OBJECTIVE: It has been suggested that fracture of the hamulus during palatoplasty in children with cleft palate may lead to adverse otological sequelae, however, there is little evidence to support this. STUDY DESIGN AND SETTING: The otological records of 42 children with repaired cleft palate (excluding submucous cleft palate) aged 8 years old or older were examined. A questionnaire regarding the incidence, treatment, and outcome of middle ear problems was completed by the parents of 68 children with repaired cleft palate, aged 9 years old or older. RESULTS: There was no significant difference between children who did and did not undergo hamular fracture with regard to tympanic membrane appearance, audiometry, history of ear problems (P = 1.000), ear infections (P = 0.622), ventilation tube insertion (P = 0.532), or surgery for chronic otitis media (P = 1.000). Parents of children not undergoing hamular fracture reported a higher incidence of below normal hearing (P = 0.023).Conclusion and significance There is no evidence that hamular fracture during palatoplasty affects long-term otological outcome in cleft palate.

Predictors of survival in early oral cancer.

OBJECTIVE: Despite the substantial rate of neck conversion reported among patients with early oral cancer, a policy of routine elective neck dissection has been criticized on the grounds that it confers little survival advantage while subjecting many to potentially avoidable morbidity. However, the identification of factors predictive of survival may allow for the identification of those patients who are more likely to benefit from elective neck treatment. STUDY DESIGN AND SETTING: The clinical and histologic material of 71 patients with stage I or II squamous carcinoma of the oral cavity were reviewed. Patients were followed up for a minimum of 3 years after their surgery, and the impact of these variables on 3-year survival was assessed. RESULTS: Increased tumor thickness was significantly predictive of decreased survival (P = 0.030). Although having no prognostic value alone, when combined with thickness, both pattern of invasion and gender increased the significance of the latter in predicting outcome. Conclusion and significance Measuring tumor thickness and pattern of invasion in patients with early oral cancer may allow for the identification of those patients with more aggressive disease who are more likely to benefit from elective neck treatment.

Incidence and outcome of middle ear disease in cleft lip and/or cleft palate.

OBJECTIVE: Otitis media with effusion is known to be very common among children with cleft palate, however, less is known regarding the natural history and outcome in this group. The purpose of the present study was to examine the incidence, natural history, treatment, and outcome of middle ear disease in children with clefts. METHODS: A questionnaire was sent to the parents of all children registered on the cleft lip and palate database at our institution. The medical records of all respondents were also reviewed. Statistical analysis of the results was performed using Fisher's exact test in contingency tables and binary logistic regression analyses, where appropriate. RESULTS: 397 fully completed questionnaires were returned. Ear disease was much more common in children with cleft palate, or cleft lip and palate, than in children with cleft lip. Among children with cleft palate, ear problems (infections and/or hearing loss) were most prevalent in the 4-6-year-old age group. However, ear problems persisted at a substantial level for many years after this; only after the age of 12 years did problems appear to settle. The incidence of below normal current hearing and of surgery for chronic otitis media was significantly related to history of ear infections (P=0.000 and 0.000, respectively), and to increased number of ventilation tube insertions (P=0.000 and 0.000, respectively). CONCLUSIONS: Middle ear disease is common in children with cleft palate, and, unlike the case for children without clefts, has a prolonged recovery, and a substantial incidence of late sequelae. The higher incidence of below normal hearing and surgery for chronic otitis media in children undergoing a greater number of ventilation tube insertions, although most likely reflecting an increased underlying severity of otitis media in these children, also underlines the lack of long-term benefits of ventilation tubes in this group.

High-resolution ultrasound findings in the symptomatic residual limbs of amputees.

INTRODUCTION: Amputations are increasingly prevalent because of medical complications associated with diabetes, meningitis, peripheral vascular disease, and neoplasms as well as road traffic accidents and war. The use of ultrasound (U/S) to diagnose the cause of pain in the residual limb of amputees is presented together with a review of the literature. PATIENTS AND METHODS: 133 civilian patients with one or more amputations were included in the study. They were seen over a 2-year period, at the Douglas Bader Unit, Queen Mary's Hospital, Roehampton, Surrey, United Kingdom, in an outpatient setting. Patients were scanned using a Philips ATL/HDI 5000 U/S scanner. RESULTS: There were 89 male and 44 female patients, age range 14 to 91 years, with a total of 136 amputated sites. 80% of amputations involved the lower limb. Neuromas were the most frequently found lesions, followed by inflammatory edema, soft-tissue calcifications, bony spurs, soft-tissue infection, overuse injuries, bursae, and skin lesions. Scar tissue, bony erosion, bone infection, aneurysm formation, venous thrombosis, and myodesis failure were less frequently seen. CONCLUSIONS: There is a wide spectrum of lesions in the amputated limb, which can be visualized by high-resolution U/S. Neuromas were the most frequent lesions seen.

Middle ear disease in children with congenital velopharyngeal insufficiency.

OBJECTIVE: To examine the incidence and natural history of middle ear disease in children with congenital velopharyngeal insufficiency (VPI) without cleft palate. SETTING AND SUBJECTS: Children with congenital VPI attending the combined cleft clinic at a tertiary cleft center. The diagnosis of congenital VPI in all cases was confirmed be the observation of hypernasality, nasal air escape, or both by a speech and language therapist and the demonstration of incompetence of the velopharyngeal sphincter by means of nasoendoscopy or videofluoroscopy. Children with overt cleft palate or postsurgical VPI were excluded. DESIGN: The children's medical records were reviewed, and a questionnaire regarding history of ear problems was sent to all parents. Children were divided into those with Pruzansky type I VPI (showing bifid uvula, midline diastasis of soft palate, or submucous cleft of the hard palate) and Pruzansky type II VPI (no visible stigmata). MAIN OUTCOME MEASURES: Incidence of reported ear problems, ear infections, hearing loss, and surgical intervention for middle ear disease in the whole group and in each of the subgroups. RESULTS: Seventy-one parents returned completed questionnaires. The overall incidence of middle ear disease was 63%, with 28% reported to have below-normal hearing. There was no significant difference between children with Pruzansky types I and II VPI with respect to incidence of otopathology or hearing loss. CONCLUSIONS: Irrespective of the presence of any visible palatal abnormalities, children with congenital VPI showed a substantial incidence of otopathology and should thus be closely monitored.