First measurements of inclusive muon neutrino charged current differential cross sections on argon

The ArgoNeuT Collaboration presents the first measurements of inclusive muon neutrino charged current differential cross sections on argon. Obtained in the NuMI neutrino beam line at Fermilab, the flux-integrated results are reported in terms of outgoing muon angle and momentum. The data are consistent with the Monte Carlo expectation across the full range of kinematics sampled, 0°<θ(μ)<36° and 0<P(μ)<25 GeV/c. Along with confirming the viability of liquid argon time projection chamber technology for neutrino detection, the measurements allow tests of low-energy neutrino scattering models important for interpreting results from long baseline neutrino oscillation experiments designed to investigate CP violation and the orientation of the neutrino mass hierarchy.

Identification of fluorescent compounds with non-specific binding property via high throughput live cell microscopy

INTRODUCTION

Compounds exhibiting low non-specific intracellular binding or non-stickiness are concomitant with rapid clearing and in high demand for live-cell imaging assays because they allow for intracellular receptor localization with a high signal/noise ratio. The non-stickiness property is particularly important for imaging intracellular receptors due to the equilibria involved.

METHOD

Three mammalian cell lines with diverse genetic backgrounds were used to screen a combinatorial fluorescence library via high throughput live cell microscopy for potential ligands with high in- and out-flux properties. The binding properties of ligands identified from the first screen were subsequently validated on plant root hair. A correlative analysis was then performed between each ligand and its corresponding physiochemical and structural properties.

RESULTS

The non-stickiness property of each ligand was quantified as a function of the temporal uptake and retention on a cell-by-cell basis. Our data shows that (i) mammalian systems can serve as a pre-screening tool for complex plant species that are not amenable to high-throughput imaging; (ii) retention and spatial localization of chemical compounds vary within and between each cell line; and (iii) the structural similarities of compounds can infer their non-specific binding properties.

CONCLUSION

We have validated a protocol for identifying chemical compounds with non-specific binding properties that is testable across diverse species. Further analysis reveals an overlap between the non-stickiness property and the structural similarity of compounds. The net result is a more robust screening assay for identifying desirable ligands that can be used to monitor intracellular localization. Several new applications of the screening protocol and results are also presented.

Methodological issues in quantifying the magnitude of the tuberculosis problem in a prison population

SETTING

Correctional settings and remand prisons.

OBJECTIVE

To critically discuss calculations for epidemiological indicators of the tuberculosis (TB) burden in prisons and to provide recommendations to improve study comparability.

METHODS

A hypothetical data set illustrates issues in determining incidence and prevalence. The appropriate calculation of the incidence rate is presented and problems arising from cross-sectional surveys are clarified.

RESULTS

Cases recognized during the first 3 months should be classified as prevalent at entry and excluded from any incidence rate calculation. The numerator for the incidence rate includes persons detected as having developed TB during a specified period of time subsequent to the initial 3 months. The denominator is person-time at risk from 3 months onward to the end point (TB or end of the observation period). Preferably, entry time, exit time and event time are known for each inmate to determine person-time at risk. Failing that, an approximation consists of the sum of monthly head counts, excluding prevalent cases and those persons no longer at risk from both the numerator and the denominator.

CONCLUSIONS

The varying durations of inmate incarceration in prisons pose challenges for quantifying the magnitude of the TB problem in the inmate population. Recommendations are made to measure incidence and prevalence.

Enhancing clinical learning in the workplace: a qualitative study

Workplace learning (WPL) is seen as an essential component of clinical veterinary education by the veterinary profession. This study sought to understand this type of learning experience more deeply. This was done utilising observations of students on intramural rotations (IMR) and interviews with students and clinical staff. WPL was seen as an opportunity for students to apply knowledge and develop clinical and professional skills in what is generally regarded as a safe, authentic environment. Clinical staff had clear ideas of what they expected from students in terms of interest, engagement, professionalism, and active participation, where this was appropriate. In contrast, students often did not know what to expect and sometimes felt under-prepared when entering the workplace, particularly in a new species area. With the support of staff acting as mentors, students learned to identify gaps in their knowledge and skills, which could then be addressed during specific IMR work placements. Findings such as these illustrate both the complexities of WPL and the diversity of different workplace settings encountered by the students.

Phenazopyridine does not improve catheter discomfort following gynecologic surgery

OBJECTIVE

We sought to determine if phenazopyridine improves pain in catheterized patients recovering from gynecologic surgery.

STUDY DESIGN

This trial randomized 240 adult women, who were undergoing gynecologic surgery and requiring an indwelling Foley catheter, to placebo or phenazopyridine hydrochloride. Group assignment was masked by instillation of orange dye in the Foley bag of both groups. The primary outcome was the mean postoperative visual analog score (VAS). Secondary outcomes were pain medicine utilization and blinding efficacy.

RESULTS

In all, 219 patients received study medications (112 phenazopyridine and 107 placebo). There was no significant difference in demographics, procedure type, bladder VAS, overall VAS, and pain medication use. Only 25 of the 45 participants who responded guessed their group assignment correctly, suggesting adequate blinding.

CONCLUSION

Postoperative VAS scores and pain medicine usage did not change with using routine phenazopyridine following gynecology surgery. Colored dye adequately masks visual side effects of phenazopyridine.

Counselling women about periconceptional use of folic acid: the role of the community pharmacist can be improved

Objective

To assess community pharmacists' attitudes towards, and practice behaviour, relating to the periconceptional use of folic acid to prevent neural tube defects

Method

A postal questionnaire was sent to a random sample of 150 community pharmacists at the end of 1996. The questionnaire covered knowledge, attitude and behaviour regarding the use of folic acid by women of childbearing age

Setting

Two regions in the Netherlands (Northern and Western Netherlands)

Key findings

The response rate was 72 per cent. Pharmacists' attitudes towards promoting the use of folic acid by women who wish to have a child are positive. Most pharmacists reported distributing folic acid brochures in their pharmacy and many stated that they displayed posters to promote the use of folic acid. Nearly 30 per cent of pharmacists reported using an additional label on the packaging of oral contraceptives with the standard text: “If you stop using the pill because you wish to have a child, please ask your pharmacist for information about the use of folic acid before you become pregnant”. Perceived attitudes of local general practitioners seemed to influence the willingness of pharmacists to promote the use of folic acid. The results indicate a tendency for some pharmacists to be more reactive than proactive in their advice-giving on the use of folic acid

Conclusion

Compared with the findings of a similar survey two years ago, it appears that more pharmacists are actively promoting the periconceptional use of folic acid. However, further improvements could still be achieved and pharmacists could become more proactive in their information and advice-giving

Community pharmacist's roles: nursing home staff and community pharmacists' views

Focal points

Sexual risk behaviour of rural-to-urban migrant taxi drivers in Dhaka, Bangladesh: a cross-sectional behavioural survey

OBJECTIVES

Human immunodeficiency virus (HIV) research in Bangladesh has mainly focused on key vulnerable groups (e.g. sex workers, drug users). In order to develop appropriate HIV prevention strategies in an evolving epidemic, there is a need for evidence on sexual practices in other population groups. This research aims to describe the prevalence of risky behaviours and factors affecting sexual behaviour/practices among rural-to-urban migrant taxi drivers in Dhaka.

STUDY DESIGN

Cross-sectional study.

METHODS

This paper reports on the cross-sectional survey component of a mixed methods research study amongst migrant workers in Bangladesh. The sample (n = 437) comprised rural-to-urban migrant taxi drivers in Dhaka (aged 18-35 years). The survey data were analysed statistically using Statistical Package for the Social Sciences.

RESULTS

Very high levels of pre- and extramarital sexual behaviour were found (84% and 51%, respectively) amongst the sample (n = 437). The reported sexual activity included high levels of risky/unsafe sex in the past year: 64% of the sample reported sex with multiple commercial sex partners (mean = 13.21), and 21.7% reported sex with other males/transgenders (mean = 2.53). Protection against risk was low: 78.2% reported that their last commercial sexual encounter was unprotected, and only 5.6% used condoms consistently. Multivariate analysis revealed that the odds of risky sexual behaviour were higher in migrant men who were not married (odds ratio 35.3, P < 0.001) and married men who were living apart from their spouses (odds ratio 41.7, P < 0.001). Additionally, reported risk behaviours were significantly associated with frequency of home visits, duration of separation from spouse and alcohol consumption. Thus, male migration without family or spouse appears to be a key driver of risky sexual practices.

CONCLUSIONS

This study provides important new information for understanding the dynamics of sexual behaviour in Bangladesh, and suggests that migrant men should be a key population for HIV prevention efforts. Nonetheless, the fact that most men were having unprotected sex with sex workers reinforces the importance of continuing to target interventions towards commercial sex contexts.