Effectiveness of benzoyl peroxide application in the treatment of acne

Acne is a skin condition involving the oil-producing glands in the skin that affects roughly 5 million Canadians. A common medication used to treat acne contains the organic compound benzoyl peroxide that works to remove acne causing bacteria in the epidermis. Benzoyl peroxide is an extremely volatile substance and, therefore, only constitutes 2% active ingredient of related acne care products. A multimedia fugacity model was used to determine the amount of chemical effectively emitted or absorbed into the skin. The parameters used in the model were set to fit a single application of medicated lotion to the face, with the non-aqueous phase liquid component being the sole receiver of the chemical. Assuming these parameters, it is estimated that 4.58x10-5 kg of benzoyl peroxide is deposited into the skin per application. The model demonstrates that humans are the main recipient of the chemical with over two-thirds being absorbed and the remaining is lost to the atmosphere through evaporation with negligible emissions to the water and soil environments. Since benzoyl peroxide is the most common chemical used to treat acne, it is important to determine how much penetrates the skin and the effectiveness of each application. *Indicates faculty mentor

The Food Stamp Nutrition Education Program Focuses on the Learner

The study reported here sought to determine how California Food Stamp Nutrition Education Program (FSNE) educators are implementing learner-centered approaches. We e-mailed a brief survey to all FSNE educators in California in 2004 (n=67; 69% responded). Most educators felt they were doing okay or very well in implementing learner-centered techniques. Techniques used less successfully included ground rules, icebreakers, partner activities, and goal setting. Focus group participants (n=15) have tried learner-centered techniques, although not all are universally successful. Learner-centered education requires advanced preparation to implement successfully; educators may need to be more assertive with agencies to achieve results

Overcoming the challenges and complexities of researching a vulnerable population within a palliative care context

While previous studies have investigated sleep issues in chronic illness and the effectiveness of Cognitive Behavioral Therapy for Insomnia (CBT-I), this has not been examined within palliative care. High rates of sleep difficulties have been found in patients receiving palliative care. We aimed to explore the practical feasibility of implementing CBT-I among palliative patients using techniques such as stimulus control therapy, progressive muscle relaxation and guided imagery/thought blocking. However, issues such as the intervention protocols being relatively labor intensive and time consuming for participants that were receiving palliative care, involving completion of daily diaries and quantitative outcome measures, led to high non-completion rates among participants. Consequently, a shift in methodology was required and a qualitative approach was adopted to explore participants’ experiences of sleep disturbance within palliative care. The aim was to gain an in-depth understanding of the specific issues and challenges within palliative care that impacted on sleep. Focus groups were conducted with patients, informal carers and hospice staff who all described how they experienced sleep difficulties. This provided a broader understanding of insomnia from multiple perspectives within palliative care. Furthermore, it helped inform how we will go about designing future studies in CBT-I in palliative care; having illuminated the appropriate adaptions required to current protocols. This case study will discuss the complexities and ethical issues we faced at each stage of the research process and how adopting both quantitative and qualitative approaches helped provide useful insights that will inform future research

A perturbation-based balance training program for older adults: study protocol for a randomised controlled trial

<p>Abstract</p> <p>Background</p> <p>Previous research investigating exercise as a means of falls prevention in older adults has shown mixed results. Lack of specificity of the intervention may be an important factor contributing to negative results. Change-in-support (CIS) balance reactions, which involve very rapid stepping or grasping movements of the limbs, play a critical role in preventing falls; hence, a training program that improves ability to execute effective CIS reactions could potentially have a profound effect in reducing risk of falling. This paper describes: 1) the development of a perturbation-based balance training program that targets specific previously-reported age-related impairments in CIS reactions, and 2) a study protocol to evaluate the efficacy of this new training program.</p> <p>Methods/Design</p> <p>The training program involves use of unpredictable, multi-directional moving-platform perturbations to evoke stepping and grasping reactions. Perturbation magnitude is gradually increased over the course of the 6-week program, and concurrent cognitive and movement tasks are included during later sessions. The program was developed in accordance with well-established principles of motor learning, such as individualisation, specificity, overload, adaptation-progression and variability. Specific goals are to reduce the frequency of multiple-step responses, reduce the frequency of collisions between the stepping foot and stance leg, and increase the speed of grasping reactions. A randomised control trial will be performed to evaluate the efficacy of the training program. A total of 30 community-dwelling older adults (age 64–80) with a recent history of instability or falling will be assigned to either the perturbation-based training or a control group (flexibility/relaxation training), using a stratified randomisation that controls for gender, age and baseline stepping/grasping performance. CIS reactions will be tested immediately before and after the six weeks of training, using platform perturbations as well as a distinctly different method of perturbation (waist pulls) in order to evaluate the generalisability of the training effects.</p> <p>Discussion</p> <p>This study will determine whether perturbation-based balance training can help to reverse specific age-related impairments in balance-recovery reactions. These results will help to guide the development of more effective falls prevention programs, which may ultimately lead to reduced health-care costs and enhanced mobility, independence and quality of life.</p

Finishing the euchromatic sequence of the human genome

The sequence of the human genome encodes the genetic instructions for human physiology, as well as rich information about human evolution. In 2001, the International Human Genome Sequencing Consortium reported a draft sequence of the euchromatic portion of the human genome. Since then, the international collaboration has worked to convert this draft into a genome sequence with high accuracy and nearly complete coverage. Here, we report the result of this finishing process. The current genome sequence (Build 35) contains 2.85 billion nucleotides interrupted by only 341 gaps. It covers ∼99% of the euchromatic genome and is accurate to an error rate of ∼1 event per 100,000 bases. Many of the remaining euchromatic gaps are associated with segmental duplications and will require focused work with new methods. The near-complete sequence, the first for a vertebrate, greatly improves the precision of biological analyses of the human genome including studies of gene number, birth and death. Notably, the human enome seems to encode only 20,000-25,000 protein-coding genes. The genome sequence reported here should serve as a firm foundation for biomedical research in the decades ahead