Biomedical subjects

Sharon Brown

Publications and source records attributed to Sharon Brown.

5 recordsLinked to original sources

PubMed2006

The beta2 but not alpha7 subunit of the nicotinic acetylcholine receptor is required for nicotine-conditioned place preference in mice.

RATIONALE: Tobacco use is implicated in approximately 440,000 deaths per year, making it the leading cause of preventable death in the United States. Although it is generally recognized that tobacco use is correlated with a variety of health-related complications, many smokers are unsuccessful in their efforts to stop smoking using current cessation therapies. OBJECTIVES: Given that nicotine is the addictive component of tobacco, successful smoking cessation therapies must address the various processes, including reward, which contribute to nicotine addiction. As such, determining the nicotinic receptor subtypes involved in nicotine reward is of utmost importance to understanding how nicotine addiction progresses. METHODS: Conditioned place preference (CPP) in three-chamber conditioning boxes was performed. For antagonist studies, drug was given on all conditioning sessions 10 min before nicotine or saline injection and placement in the boxes. RESULTS: We have demonstrated that a pretreatment with the alpha4beta2 subunit of the nicotinic acetylcholine receptor (nAChR) antagonist dihydro-beta-erythroidine (2.0 mg/kg, s.c.) blocked nicotine (0.5 mg/kg, s.c.) CPP in wild-type mice (C57BL/6 mice). In contrast, pretreatment with an antagonist of the alpha7 subunit of the nAChR, methyllycaconitine (MLA, 5.0 or 10.0 mg/kg, s.c.), had no effect on this behavior. Finally, we showed that mice lacking the beta2 subunit of the nAChR did not exhibit nicotine CPP while alpha7 knock-out mice did. CONCLUSION: Taken together, these data suggest that the beta2 subunit of the nAChR is critically involved in nicotine reward as measured by CPP.

Aconitine↗

PubMed2006

A new role for advanced practice nurses in Canada: bridging the gap in health services for rural older adults.

This article is a report on the evaluation of a new nursing initiative in rural western Canada-the gerontological advanced practice nurse (GAPN) project. Using a qualitative approach in the i initial evaluative phase, the authors determined how the GAPN evolved, functioning primarily in a clinical nurse specialist role, and identified the successes and challenges of the project. The initial findings indicated health benefits to rural older adults. The project's success was attributed to strong support from key players, and attempts to address perceived gaps in rural health service. Challenges in developing the GAPN role included limited planning time, and lack of a clear definition about the role and responsibilities of the GAPN. The introduction of a GAPN, especially in underserved rural communities, has the potential to provide essential health care services to older adults, and to make major contributions to changing gerontology practice.

Adaptation, Psychological↗

PubMed2005

Adolescent health: a rural community's approach.

INTRODUCTION: Significant health problems encountered in adulthood often have their roots in health behaviours initiated during adolescence. In order to reverse this trend, school and health personnel, as well as parents and other community members working with high school students, need to be aware of the health-related beliefs and choices that guide the behaviours of teenagers. Although a wide variety of research has been conducted on this topic among urban adolescents, less is known about the health beliefs and behaviors of adolescents residing in rural areas, particularly in Canada. In general, rural Canadians are less healthy than their urban counterparts. Building on the knowledge and understanding of their own community, key stakeholders were invited to engage in the design and implementation of a participatory action research project aimed at understanding and improving the health of rural adolescents. METHODS: A group of parents, teachers, students, school administrators and public health nurses engaged in a participatory action research project to better understand determinants of the health of rural adolescents at a high school in Western Canada. Group members developed and administered a health survey to 288 students from a small rural high school, in an effort to identify areas of concern and interest regarding health practices and beliefs of rural adolescents, and to take action on these identified concerns. RESULTS: Results indicated some interesting but potentially worrying trends in this population. For example, while frequent involvement in a physical activity was noted by 75.9% of participants, close to half of the females (48%) described their body image as 'a little overweight' or 'definitely overweight', and approximately 25.8% of respondents noted that they skipped meals most of the time. Differences between the genders were apparent in several categories. For example, more girls smoked (16.2%) than boys (12.3%), and more males (55.0%) than females (41%) had tried illegal drugs. Participants indicated awareness of other health-compromising behaviours, including unsafe driving habits and high stress levels, and acknowledged several steps they wanted to take to improve their health, as well as the barriers to taking those steps. Students identified improved nutrition, stress reduction, and increased levels of physical activity as particular important health goals. Students also recommended ways in which information and support could be provided within the school environment to enable them to achieve their health-related goals. Several activities developed in collaboration with students have incorporated the recommendations, and have spawned other activities in response to the ongoing identification of new concerns. CONCLUSIONS: The process of including the rural community in the identification of health assets and needs from the perspective of students -- as well as the planning and implementation of appropriate strategies to address those needs -- demonstrates the strengths inherent within a small rural population. Community members' awareness of the need to create a healthy environment for youth is reflected in their willingness to participate in activities leading to improved health. Greater awareness of the health needs of rural adolescents, and of the influence of gender in some aspects of health behaviors, will help researchers to explore ways in which the unique culture of rural communities can be harnessed to help shape health-focused interventions.

Adolescent↗

PubMed2003

Deciphering indented impressions on plastic.

The questioned document laboratory is often called upon to decipher writing that has been erased, obliterated, or that has faded. In cases like these, the original writing is no longer legible to the naked eye, but may be enhanced using various light sources. Certain remnants of the ink's components absorb into the substrate's fibers and can be visualized, usually as luminescence or absorbance. A case is described here that involved the theft of a credit card. An empty plastic credit card holder was found in the possession of a suspect, and as submitted for examination. Indented impressions could be discerned on its clear plastic window and presumably originated from the credit card that had been held in the envelope. These indented impressions were deciphered in the hope that they would reveal enough details from the credit card to establish a connection between the plastic envelope and the stolen credit card. With methods generally utilized in the toolmarks and materials laboratory and the photography laboratory of the Israel Police, most of the indented impressions on the plastic were deciphered and a connection between the plastic envelope and the stolen credit card was demonstrated.

Journal Article↗

PubMed2003

Color separation of signature and stamp inks to facilitate handwriting examination.

The questioned documents laboratory often encounters cases where handwriting that is to be examined intersects with some interfering factor such as a rubber stamp, typewriting or background printing. In these cases, line direction, beginning and ending features of letters and other fine details of the handwriting may be lost in the "noise" of the intersecting ink. The purpose of this paper is to show several new digital photography methods that may be used to "subtract" the effect of the intersecting ink, thereby enhancing that of the handwriting ink in order to enable the document examiner to conduct a complete examination. These methods have the advantage of being fast and do not involve the use of expensive material or equipment. Several new methods are described that may be used to separate the colors of the handwriting ink from that of the intersecting ink: the analog method and several digital methods such as RGB-HSB-CMYK, L*a*b color, and color separation using the Channel Mixer function of Adobe Photoshop. Successful application of these color separation methods to specific handwriting ink/rubber stamp ink color combinations shows that the effect of the intersecting ink may indeed be minimalized if not canceled altogether. Application of the suggested methods may well make the difference between a nonconclusive handwriting examination and a full analysis of the questioned handwriting.

Journal Article↗