Effect of tropical forest disturbance on the competitive interactions within a diverse ant community.

Understanding how anthropogenic disturbance influences patterns of community composition and the reinforcing interactive processes that structure communities is important to mitigate threats to biodiversity. Competition is considered a primary reinforcing process, yet little is known concerning disturbance effects on competitive interaction networks. We examined how differences in ant community composition between undisturbed and disturbed Bornean rainforest, is potentially reflected by changes in competitive interactions over a food resource. Comparing 10 primary forest sites to 10 in selectively-logged forest, we found higher genus richness and diversity in the primary forest, with 18.5% and 13.0% of genera endemic to primary and logged respectively. From 180 hours of filming bait cards, we assessed ant-ant interactions, finding that despite considered aggression over food sources, the majority of ant interactions were neutral. Proportion of competitive interactions at bait cards did not differ between forest type, however, the rate and per capita number of competitive interactions was significantly lower in logged forest. Furthermore, the majority of genera showed large changes in aggression-score with often inverse relationships to their occupancy rank. This provides evidence of a shuffled competitive network, and these unexpected changes in aggressive relationships could be considered a type of competitive network re-wiring after disturbance.

Towards optical polarization control of laser-driven proton acceleration in foils undergoing relativistic transparency.

Control of the collective response of plasma particles to intense laser light is intrinsic to relativistic optics, the development of compact laser-driven particle and radiation sources, as well as investigations of some laboratory astrophysics phenomena. We recently demonstrated that a relativistic plasma aperture produced in an ultra-thin foil at the focus of intense laser radiation can induce diffraction, enabling polarization-based control of the collective motion of plasma electrons. Here we show that under these conditions the electron dynamics are mapped into the beam of protons accelerated via strong charge-separation-induced electrostatic fields. It is demonstrated experimentally and numerically via 3D particle-in-cell simulations that the degree of ellipticity of the laser polarization strongly influences the spatial-intensity distribution of the beam of multi-MeV protons. The influence on both sheath-accelerated and radiation pressure-accelerated protons is investigated. This approach opens up a potential new route to control laser-driven ion sources.

A simple microscopy assay to teach the processes of phagocytosis and exocytosis.

Phagocytosis and exocytosis are two cellular processes involving membrane dynamics. While it is easy to understand the purpose of these processes, it can be extremely difficult for students to comprehend the actual mechanisms. As membrane dynamics play a significant role in many cellular processes ranging from cell signaling to cell division to organelle renewal and maintenance, we felt that we needed to do a better job of teaching these types of processes. Thus, we developed a classroom-based protocol to simultaneously study phagocytosis and exocytosis in Tetrahymena pyriformis. In this paper, we present our results demonstrating that our undergraduate classroom experiment delivers results comparable with those acquired in a professional research laboratory. In addition, students performing the experiment do learn the mechanisms of phagocytosis and exocytosis. Finally, we demonstrate a mathematical exercise to help the students apply their data to the cell. Ultimately, this assay sets the stage for future inquiry-based experiments, in which the students develop their own experimental questions and delve deeper into the mechanisms of phagocytosis and exocytosis.

The health and well-being of prostate cancer patients and male-to-female transsexuals on androgen deprivation therapy: a qualitative study with comments on expectations and estrogen.

Both male-to-female transsexuals and advanced prostate cancer (PCa) patients are treated with androgen-suppressing drugs that have emasculating effects. Additionally, transsexuals take estrogenic compounds to feminize their bodies. We explore the quality of life of these populations, based on interviews with 12 individuals from each group. Overall, the transsexuals had a better psychological response to chemical castration than the PCa patients. The transsexuals showed more enthusiasm about the changes in their life; they viewed their lives as beginning anew, accepted their reduced libido, and were more comfortable with their increased emotionality. Different responses in the two groups are not surprising given that they undergo androgen deprivation under very different medical contexts. However, the fact that the transwomen are able to conceptualize the effects as positive suggests that some androgen-deprived PCa patients may benefit from reconceptualizing their changes within a positive framework. Additionally, difference in the two populations may be attributed, in part, to the fact that the transsexuals take supplemental estrogen. Circumstantial evidence suggests that estrogen in androgen-deprived males may improve sleep quality, help retain sexual interest, and protect cognitive function. This suggests that PCa patients may benefit from using estradiol for androgen suppression.

Prospective survey of sexual function among patients with clinically localized prostate cancer referred for definitive radiotherapy and the impact of radiotherapy on sexual function.

PURPOSE: The purpose of this study is to assess sexual function among patients with clinically localized prostate cancer referred for radiotherapy and to prospectively evaluate the effect of radiotherapy on sexual function, using the Brief Sexual Function Inventory (BSFI). MATERIALS AND METHODS: A descriptive study, approved by the local research ethics committee, was prospectively conducted. At baseline, patients were asked to complete a self-administered BSFI, along with other questionnaires describing their clinical condition. Patients with normal erection at baseline were asked to complete a follow-up BSFI at 6, 12, and 24 months postradiotherapy. The collected data was analyzed using the SAS software. RESULTS: The study accrued a total of 117 eligible patients. The mean age was 66 years. Forty-two patients (35.9%) were considered to have erectile dysfunction (ED) at baseline. They were older and more likely on one or more medications affecting potency, compared with those with normal erectile function. They had a consistently lower mean score for all the five domains of BSFI and considered sexual activity less important. Of the 75 patients reporting normal erectile function at baseline, 61 completed a follow-up BSFI questionnaire. Among the 61 patients, 52 underwent radiotherapy with external beam radiotherapy or brachytherapy. Mean scores for all the BSFI domains declined after radiotherapy, suggesting that radiotherapy adversely affected not only erectile function but also other aspects of sexual function including sexual drive and ejaculation. CONCLUSION: Among the patients with clinically localized prostate cancer referred for radiotherapy, sexual dysfunction was prevalent with 35.9% reporting ED at presentation. Radiotherapy adversely affected all aspects of sexual function.

Relationship vulnerabilities during breast cancer: patient and partner perspectives.

OBJECTIVE: Close interpersonal relationships play a crucial role in a woman's adjustment to breast cancer. To date, the literature has focused primarily on characteristics or behaviors of the well spouse that influence a woman's adaptation to the illness. The present qualitative investigation extended this literature by adopting an interactional perspective based on the underlying assumption that relationship partners' coping and distress is mutually influential. The focus of the analysis was patient and partner perceptions of relationship strife or tension over the course of the illness based on the notion that such interactions may be as or more harmful to relationships than supportive exchanges are helpful. METHOD: Nineteen women (at different stages of the illness) and eleven male spouses were interviewed about their experiences in relation to breast cancer. Nine of the men and nine of the women were relationship partners. Interview text was subjected to a thematic analysis and informed by grounded theory principles. RESULTS: Two higher-order categories of Personal Characteristics (both patient and partner) and Relationship Dynamics that impeded couple adjustment defined the overall theme of Relationship Vulnerabilities. CONCLUSIONS: Findings from this study are situated within a broader developmental framework wherein breast cancer is considered a catastrophic life event that challenges the assimilation and accommodation processes of both partners in the relationship. For couples that are able to overcome the relationship challenges associated with the illness, there is the potential for mutual growth, and a deepening and strengthening of the relationship. Implications for clinical practice are discussed.

Health psychology and the arts: a conversation.

Critical approaches within health psychology continue to explore new methods of working and new theoretical ideas from other disciplines. One area that remains under-explored is the potential links with the arts. This special issue contains a selection of empirical and theoretical reports on the linkages between health psychology and the arts. It includes arts and health projects in clinical, community and educational contexts; projects with young and old people, projects with people from different social and ethnic background and projects using different forms of art. This article introduces the special issue and uses a dialogic format to consider some of the broader issues.

Survivor dragon boating: a vehicle to reclaim and enhance life after treatment for breast cancer.

The authors investigated the psychosocial impact of dragon boat participation on women who have been treated for breast cancer. Open-ended qualitative interviews were completed by 10 new members recruited from two breast cancer survivor dragon boat teams. Our findings indicate that the women's experience of survivor dragon boating surpassed their expectations and offered them hope and increased strength and the ability to regain control of their lives. Key themes emerging from the in-depth interviews that encapsulate the experiences of women in their first season of dragon boating follow: awakening of the self, common bond, regaining control, being uplifted, and transcending the fear of death. The interview data support the emerging hypothesis that dragon boating is a vehicle for improving women's wellness and post-treatment quality of life.

Restoration of satisfying sex for a castrated cancer patient with complete impotence: a case study.

We present a first-hand account of a fully impotent, testosterone-suppressed prostate cancer patient who has satisfying, multiorgasmic sex using a strap-on dildo. We use his narrative to examine dildos as an alternative to erectile dysfunction treatments for men, such as this patient, who find selective inhibitors of PDE-5 ineffective and surgical intervention unacceptable. We explore what conditions allowed this man to progress from suspicious distrust of the dildo to full acceptance. In terms of making a dildo acceptable to other patients, we contrast offering it to them as a penile prosthesis in a formal medical setting versus treating it as a toy in fantasy sex play. Last, we present a neurobiological hypothesis involving sensory integration to help explain why sex with the strap-on dildo can be satisfying to a male.

'Nothing fit me': nationwide consultations with young women with breast cancer.

OBJECTIVE: There exists little research about the experience of breast cancer for young women in Canada. To address this gap, the Canadian Breast Cancer Network (CBCN) and the Ontario Breast Cancer Community Research Initiative undertook a research project to explore the information and support experiences, needs and recommendations of geographically diverse Canadian young women with breast cancer. SETTING AND PARTICIPANTS: We consulted with 65 young women in 10 focus groups held across Canada. All women had been diagnosed with breast cancer at, or before, 45 years of age. During the consultations the women were asked to discuss their information and support experiences and needs, as well as resource recommendations related to their diagnosis, treatment and survivorship. MAIN RESULTS: The overarching theme, 'Nothing Fit Me', revealed that accessed information, support and programmes/services did not 'fit' or match the women's age or life stage. When we asked for their recommendations the young women suggested that information and support match their age and life stage and that health-care providers create and implement several topical workshops concerning, for example, sexuality, lymphedema and reconstruction. CONCLUSION: The findings will be used by the CBCN as a general platform from which to conduct further research and/or action strategies. The CBCN will also implement the recommendations from this groundbreaking work as this network formulates a national strategy for young women with breast cancer.

Audience responses to a research-based drama about life after breast cancer.

This article explores audience reactions to the research-based drama Ladies in Waiting? Life After Breast Cancer. Quantitative findings indicate an overwhelmingly positive response, with approximately 90% of those who saw the production agreeing that they benefited from seeing it and indicating that they would recommend it to others. Qualitative data reveal a more complex picture of the range of reactions, allowing us to describe the most valued aspects of the production (mainly how it eased isolation and normalized the difficult aspects of survivorship) and to better understand the few reports of distress. Audience responses to Ladies in Waiting? suggest that chronic aspects of breast cancer are rarely acknowledged. Viewing the production as one that reveals difficult and hidden realities allows for a fuller understanding both of its supportive and unsettling effects.

The experiences of men receiving androgen deprivation treatment for prostate cancer: a qualitative study.

OBJECTIVE: This exploratory study was intended to investigate men's ways of integrating and understanding experiences with Androgen Deprivation Therapy (ADT), including how hormone treatment affected their sense of identity. PATIENTS AND METHODS: Twelve men, averaging 61 years of age and treated with ADT, participated in a single interview about their experiences with prostate cancer and hormone treatment. In keeping with a qualitative approach, questions were initially open-ended, with patients encouraged to describe experiences in their own words. RESULTS: Seven prominent themes appeared in the interviews: 1) starting on hormones, 2) matching expectations with reality, 3) tracking changes, 4) dealing with changes in sexuality, 5) navigating relationships, 6) putting things in context, and 7) interpreting gender-relevant changes. CONCLUSION: The effects of ADT on men with prostate cancer were varied and often substantial in their impact. Additionally, men often receive insufficient information to prepare them to deal with side effects. While the physiological situation of the men in our study could be described as "liminal" (i.e., straddled between two categories of gender), interview data showed that they refuse their liminality, claiming to be neither less masculine nor more feminine because of treatment. While men are grateful to receive potentially life-extending treatment, the challenge for the health care system is to provide them with the information and clinical support that will make their remaining years the best that they can be.

Travelling for radiation cancer treatment: patient satisfaction.

This study was conducted for the purpose of describing cancer patients' satisfaction with their care when they had to travel unexpectedly away from home for treatment. Ontario initiated a rereferral program for cancer patients who needed radiation therapy when the waiting lists in southern Ontario became lengthy. Patients travelled to the United States or northern Ontario for their care. A standardized survey containing 25 items with five-point Likert scale responses was mailed to all patients who participated in the rereferral program, following completion of their treatment. Items covered patient experiences before leaving home, in preparing for travel, and staying at the cancer facilities away from home. A total of 466 (55.8%) patients returned the survey. Overall, patients were satisfied with their care. However, there were a number of areas identified by patients where improvements could be made. These areas included access to support prior to leaving home, access to information about supportive care services while away from home, and sensitivity to personal needs in making arrangements for travel. Provision of information and support are important to cancer patients having to travel for cancer treatment.

Two Black men with prostate cancer: a narrative approach.

OBJECTIVES: This paper demonstrates the value of a narrative approach for health psychology. It focuses on the lives of two Black men with prostate cancer, drawn from a larger study investigating the links between masculinities and prostate cancer. DESIGN: The study was a qualitative, interview-based study. Each participant was interviewed four times. METHODS AND ANALYSIS: The men were asked to describe and discuss their prostate cancer experience, as well as their lives prior to illness. In order to gain a perspective on individual experiences of men with prostate cancer, we took a narrative approach to gathering and analysing data. Results are reported through two descriptive narratives. CONCLUSIONS: The narratives of the men described in the paper show how the interaction of race with health and illness is neither predictable nor consistent at the individual level. Black men, like all men with prostate cancer, have diverse experiences and are influenced by a wide array of personal and societal factors. While the high risk of prostate cancer among Black men makes proactive interventions advisable, such interventions will be most effective if the heterogeneity of men's experiences are taken into account.

Restoring sexual function in prostate cancer patients: an innovative approach.

It has been extremely difficult for men with prostate cancer to obtain reasonable estimates of the likelihood of remaining potent after first line therapy, partly because of differences in defining potency. If, as in more recent studies, the definition requires that men are usually (not just occasionally) able to get and sustain an erection, then the picture is not encouraging. Additional strategies are needed to help men sustain sexual activity. In this paper we draw on the experiences of a rather remarkable prostate cancer patient to help consider the possibilities for a different kind of intervention for men with ED--use of a strap-on dildo (an external prosthetic penis fastened by a harness around the hips). The dildo is a simple and inexpensive strategy for dealing with impotence and in certain circumstances it can work better than more established medical treatments for ED. Use of a dildo potentially removes the fear of erectile failure, allows for increased stimulation of the glans, facilitates full-body contact between partners, and offers potential satisfaction to one's partner. Urologists (and other health professionals) are encouraged to explore dildos as an option during discussions with patients about sexual rehabilitation. The potential benefits are discussed of specialty sexuality clinics that facilitate introduction of innovative approaches like dildos.

A consultation with Canadian rural women with breast cancer.

OBJECTIVE: Relatively little research has been carried out on the health and supportive care needs of rural women living with breast cancer. In this study, results from a Canadian focus group study are used to highlight issues of importance to rural women. SETTING AND PARTICIPANTS: A total of 276 rural women with breast cancer divided into 17 focus groups participated in the study conducted across Canada. A standardized protocol for discussion was employed. Issues of access to information, support and services were discussed, with women describing their experiences in trying to find appropriate programmes and services. MAIN RESULTS: The major theme identified through analysis of qualitative data was 'becoming aware of and/or gaining access to health care information, support and services.' Other major themes included: (1) dealing with isolation; (2) having to travel; (3) feeling the financial burden and (4) coping with changing work. CONCLUSIONS: Rural women with breast cancer have supportive care challenges related to their circumstances. A series of recommendations were generated through the consultation process which are contributing to the development of a national strategy focusing on the development and extension of programmes for rural women with breast cancer. Although the research on the project was not to specified standards, and suffered from less attention than community capacity building and advocacy, it proved to be of worth and revealed potential benefits from collaborations between researchers and community organizations.

Perspectives on colorectal cancer screening: a focus group study.

OBJECTIVE: To assess attitudes and acceptability of Ontario consumers and doctors towards colorectal screening with faecal occult blood testing (FOBT) and colonoscopy. DESIGN, SETTING AND PARTICIPANTS: Focus groups with gender-specific samples of the population, high-risk gastroenterology patients and family doctors. METHOD: Semi-structured interview guides used by facilitator to lead groups through knowledge of risk factors and prevention of colorectal cancer, the screening modalities, requirements for implementing screening programmes, barriers to screening and preferences towards screening. MAIN FINDINGS: There were low levels of knowledge about colorectal cancer and its prevention in the general population. FOBT was an acceptable screening modality, but considerable education about its use and benefits would be necessary to implement a screening programme. Colonoscopy was not perceived to be a good choice for a primary screen in the general population. The high-risk group supported use of FOBT in the general population and emphasized the need for education. The doctors were more reluctant about screening, requesting clear guidelines. They also identified the time and resources that would be required if a screening programme were initiated. CONCLUSION: While colorectal screening is acceptable in this sample, information and decision aids are required to enable consumers and providers to make effective decisions. Implementation of colorectal screening programmes requires substantial educational efforts for both consumers and doctors.

Use of complementary/alternative medicine by men diagnosed with prostate cancer: prevalence and characteristics.

OBJECTIVES: To ascertain the prevalence of the use of complementary/alternative medicine (CAM) among a random sample of Ontario (Canadian) men diagnosed with prostate cancer and to explore in what way users of CAM differ from nonusers. METHODS: A questionnaire was mailed to a random sample of 696 men diagnosed with prostate cancer. RESULTS: The final response rate was 78.8%. Almost one third (29.8%) reported using CAM for their prostate cancer care. Natural health products (most commonly vitamin E, saw palmetto, and selenium) were used by 26.5% of the respondents. CAM therapies were used by 17.0% of the men (most commonly dietary changes), and only 9.1% visited CAM practitioners. Three characteristics appear to differentiate CAM users from nonusers. Men who had attended support groups were much more likely to use CAM. Men who had more advanced disease, and those who believed in the efficacy of CAM, but were not concerned about potential adverse effects of CAM, were also more likely to use CAM. CAM use was not related to education, income, or geographic location. CONCLUSIONS: The data suggest that CAM use is no longer a phenomenon restricted to a unique segment of the population that is highly educated and enjoys a high family income. CAM use appears to be more related to other factors such as support group attendance, disease characteristics, and beliefs about CAM. Our findings highlight the need for urologists to ask all their patients about their use of CAM.

Travelling for radiation cancer treatment: patient perspectives.

Radiation treatment for cancer requires patients to receive frequent administrations and attend the treatment facility on a daily basis for several weeks. Travelling for radiation treatment has the potential to add to the distress an individual may be feeling. This study utilized in-depth interviews to capture 118 patients' perspectives about travelling for cancer treatment. Four themes emerged during the analysis of the data: (1) waiting was the most difficult part of the experience; (2) the idea of travelling for treatment was distressing; (3) travelling for treatment was tiring and posed difficulties for patients; and (4) being away from home had both benefits and drawbacks. Given the inevitability of travelling for radiation treatment, and the issues that arises for patients, supportive strategies need to be designed and implemented.