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Multiple Barriers (multiple + barrier)
Selected AbstractsMultiple barriers to gene exchange in a field cricket hybrid zoneBIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY, Issue 2 2009LUANA S. MAROJA Data on patterns of variation within hybrid zones, combined with studies of life history, mate choice, and hybrid performance, allow estimates of the contribution of different pre-zygotic and post-zygotic barriers to reproductive isolation. We examine the role of behavioural barriers to gene exchange in the maintenance of a hybrid zone between North American field crickets Gryllus firmus and Gryllus pennsylvanicus. We consider these barriers in the context of previous studies that documented temporal and ecological isolation and a one-way post-mating incompatibility (i.e. G. firmus females do not produce offspring when they mate only with heterospecific males). Based on no-choice mating experiments in the laboratory, we demonstrate strong behavioural pre-mating barriers between the two species, but no apparent fecundity or fertility costs for G. firmus females when they mate with both conspecific and heterospecific males. Furthermore, we show that G. firmus females do not discriminate between hybrids and conspecifics, whereas G. pennsylvanicus females do. This observation could explain the asymmetric allele introgression observed in the hybrid zone. We also document a failure of heterospecific males to induce normal oviposition in G. firmus females, which may be due to rapid evolution of accessory gland proteins and may serve as an additional barrier to gene exchange. © 2009 The Linnean Society of London, Biological Journal of the Linnean Society, 2009, 97, 390,402. [source] Integrating diversity and fostering interdependence: Ecological lessons learned about refugee participation in multiethnic communitiesJOURNAL OF COMMUNITY PSYCHOLOGY, Issue 4 2002Jessica R. Goodkind Communities in the United States are becoming increasingly diverse, in part, because of the continual resettlement of refugees and immigrants from around the world. The promotion of refugees' well-being and integration depends upon how our communities value diversity and provide opportunities for meaningful involvement. However, refugees often face challenges to such involvement. An ecological perspective suggests that it is important to consider not only the characteristics of individuals but also to examine the extent to which particular settings are able to facilitate the participation of community members. The purpose of this study was to understand the participation experiences of 54 Hmong refugees living in multiethnic housing developments. Interviews revealed that while Hmong residents valued participation highly, most were excluded from meaningful avenues of participation because of multiple barriers, including language differences, time constraints, and discrimination. No supports to address these barriers existed in their communities. It is important to understand and build individuals' capacities to participate and communities' capacities to promote involvement, integrate diversity, and foster interdependence. Participation is fundamental to the process of enabling refugees to become an integral part of their new communities and is a potential way for them to regain a sense of control over their lives and the decisions that affect them. © 2002 Wiley Periodicals, Inc. [source] Parental mental illness: a review of barriers and issues for working with families and childrenJOURNAL OF PSYCHIATRIC & MENTAL HEALTH NURSING, Issue 9 2009D. MAYBERY phd Accessible summary For the psychiatric workforce to become family focused (particularly in relation to children) there is a clear need for family sensitive policies and procedures, managerial and organizational support and well-targeted and sustained workforce training. However, there are multiple barriers to the adult mental health workforce becoming family focused including: ,,Some adult mental health services do not identify consumers who are parents and subsequently do not respond to children, parenting and family needs. ,,Organizations often do not have adequate family and child friendly policies and procedures. ,,The adult mental health workforce lacks skills and knowledge about families, children and parenting. ,,The workforce needs to increase encouragement of consumers to include family members and dependent children in treatment of the ill parent including the provision of psycho-education. Abstract Many consumers of psychiatric services are parents, making these services the opportunistic point for supporting consumers' children. While evidence suggests that assisting such children improves their mental health, there is a large gulf between what psychiatric services should (or could) provide and what they do in practice. This paper summarizes the constraining barriers and issues for the psychiatric workforce according to: (1) policy and management; (2) interagency collaboration; (3) worker attitude, skill and knowledge; (4) the parent-consumer; and (5) the consumer's family, including children. Potential solutions are presented, with a particular focus on the hierarchical nature of these barriers. Recommendations are made, including organizational audits to identify the most pressing barriers that impede family sensitive practice. [source] Raising awareness about fecal incontinence,,NEUROUROLOGY AND URODYNAMICS, Issue 4 2010Donna Z. Bliss Abstract There is a lack of awareness about fecal incontinence despite its prevalence and adverse impact on quality of life. Inadequate knowledge about fecal incontinence deters help-seeking, therapeutic consultation, and clinical research about effective prevention and management strategies. A systematic, evidenced-based approach to raise awareness of fecal incontinence is essential to forward progress and overcome multiple barriers. In this manuscript, strategies of this approach are prioritized and focus on increasing continence literacy and communication, emphasizing prevention and screening, disseminating evidenced-based management interventions, and promoting larger scale impact through effective partnerships. Neurourol. Urodynam. 29:612,615, 2010. Copyright © 2010 Wiley-Liss, Inc. [source] Plasmodium,mosquito interactions: a tale of dangerous liaisonsCELLULAR MICROBIOLOGY, Issue 11 2005Carolina Barillas-Mury Summary To complete their life cycle, Plasmodium parasites must survive the environment in the insect host, cross multiple barriers including epithelial layers, and avoid destruction by the mosquito immune system. Completion of the Anopheles gambiae and Plasmodium falciparum genomes has opened the opportunity to apply high throughput methods to the analysis of gene function. The burst of information generated by these approaches and the use of molecular markers to investigate the cell biology of these interactions is broadening our understanding of this complex system. This review discusses our current understanding of the critical interactions that take place during the journey of Plasmodium through the mosquito host, with special emphasis on the responses of midgut epithelial cells to parasite invasion. [source] | |||||||||||||