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PubMed2002

Evaluation of an HIV/AIDS prevention intervention targeting Latino gay men and men who have sex with men in Puerto Rico.

This article presents the evaluation of an HIV prevention model and intervention targeting Latino gay males and men who have sex with men in Puerto Rico. Based on the health belief model in combination with concepts of self-efficacy, cognitive theory, and community development, a series of workshops were developed to enhance safer sex behavior among participants. A total of 587 men recruited by availability in gay meeting places and through peer referral participated in the intervention between 1992 and 1995. Participants engaged in a 3-hour small group meeting and four 3-hour workshops as part of the intervention. Pretests and posttests were administered to measure knowledge, attitudes, and behaviors related to HIV infection; a risk index was calculated to measure the level of behavior risk for HIV infection. Participants demonstrated lower risk indexes after the intervention. This model represents a culturally competent and relevant intervention for similar communities.

Acquired Immunodeficiency Syndrome↗
PubMedDate not supplied

Partnering in and for heart health promotion: findings from a survey of community organizations.

This paper presents the results of a survey conducted with representatives (n = 283) of community health agencies linked to heart health activity in Ontario in order to: 1) describe their levels of involvement in heart health promotion, 2) describe the nature and extent of partnering undertaken in the context of community-based heart health promotion, and 3) assess the extent to which community development approaches vis-à-vis partnering are being employed in Ontario heart health promotion. The survey included a series of questions regarding level of agency involvement in heart health promotion activities organized around four areas: tobacco, nutrition, physical activity and general heart health. Respondents were also asked to report the nature and extent of partnering that took place. Results indicate that levels of involvement varied significantly across activity area and by organization, although every agency type reported some level of involvement in each of the four activity areas. Overall, agencies surveyed continue to employ traditional settings (i.e., schools and community) as well as strategies (i.e., public education) but report a substantial amount of partnering and collaboration when undertaking community-based heart health promotion activities.

Cardiovascular Diseases↗
PubMed2006

Sequentially assembled food webs and extremum principles in ecosystem ecology.

1. Successional changes during sequential assembly of food webs were examined. This was carried out by numerical methods, drawing one species at a time from a species pool and obtaining the permanent (persistent) community emerging at each step. Interactions among species were based on some simple rules about body sizes of consumers and their prey, and community dynamics were described in terms of flows of biomass density. 2. Sequential assembly acted as a sieve on the communities, assembled communities having many properties different on average from those of feasible, stable communities taken at random from the species pools. 3. Time-series of community development were consistent with certain functions thought to go to an extremum (maximum or minimum) in ecosystem ecology, including a rapid early increase in net primary productivity and ascendency, although a clear trend in total biomass density was not evident and resilience decreased rather than increased. 4. In addition, more gradual changes in food web structure took place during succession to which the ecosystem goal functions were relatively insensitive. These changes included gradual increases in the number of species, invasion resistance, number of loops of length > 2 and number of prey species per consumer species. 5. We therefore argue that ecosystem and community dynamics can offer complementary insights into the process of ecological succession. The extremum principles of ecosystem ecology highlight some of the major properties of succession, whereas the community ecology sheds light on some more subtle changes taking place within the networks.

Animals↗
PubMed1992

Urogenital tract infections in pregnancy at King Edward VIII Hospital, Durban, South Africa.

OBJECTIVES: To evaluate the role of detecting asymptomatic bacteriuria and endocervical infections in the black prenatal patients attending King Edward VIII Hospital (KEH), Durban, with the view of justifying a screening programme. Screening for syphilis and human immunodeficiency virus (HIV) infection were also evaluated. SUBJECTS: 181 asymptomatic black prenatal patients attending the antenatal clinic for their first antenatal visit volunteered for the study and gave their written consent. DESIGN: Examination of each prenatal patient included obtaining of endocervical swabs to detect endocervical infections (C trachomatis, N gonorrhoeae), serum for syphilitic and HIV testing, and a midstream specimen of urine for microscopy and culture. RESULTS: Asymptomatic bacteriuria was found in 5.6% of patients in this study. Cervical infections were diagnosed microbiologically in 8.2% of women. These were N gonorrhoeae in 4.1% and C trachomatis in 4.7%. Serological tests for sexually transmitted diseases showed the presence of syphilis in 7.6% and antibody to the HIV in 1.9%. Overall, one or more sexually transmitted diseases were found in 16.5% of the women studied. CONCLUSIONS: This study suggests that all women presenting for routine antenatal care in a setting such as Durban should be screened for lower genital tract infections. Ideally this should include a midstream urine specimen for culture, serum for syphilitic and HIV antibody testing and endocervical swabs for sexually transmitted pathogens. In developing communities, however, more reliable and cheaper methods of endocervical screening need to be available before antenatal screening for cervico-vaginal infections can be justified.

Adolescent↗
PubMed2002

Peer education, gender and the development of critical consciousness: participatory HIV prevention by South African youth.

Despite the growing popularity of participatory peer education as an HIV-prevention strategy worldwide, our understandings of the processes underlying its impact on sexual norms are still in their infancy. Starting from the assumption that gender inequalities play a key role in driving the epidemic amongst young people, we outline a framework for conceptualizing the processes underlying successful peer education. We draw on the inter-locking concepts of social identity, empowerment (with particular emphasis on Freire's account of critical consciousness) and social capital. Thereafter we provide a critical case study of a school-based peer education programme in a South African township school, drawing on a longitudinal case study of the programme, and interviews and focus groups with young people in the township. Our research highlights a number of features of the programme itself, as well as the broader context within which it was implemented, which are likely to undermine'the development of the critical thinking and empowerment which we argue are key preconditions for programme success. In relation to the programme itself, these include peer educators' preference for didactic methods and biomedical frameworks, unequal gender dynamics amongst the peer educators, the highly regulated and teacher-driven nature of the school environment and negative learner attitudes to the programme. In relation to the broader context of the programme, we point to factors such as limited opportunities for communication about sex outside of the peer educational setting, poor adult role models of sexual relationships, poverty and unemployment, low levels of social capital and poor community facilities. We discuss the implications of our findings for the design of peer educational activities, and point to a number of broader social and community development initiatives that would maximize the likelihood of programme success.

Adolescent↗
PubMed1995

Prevalence of intestinal parasites in Saudi children: a community-based study.

A community-based study was undertaken to determine the prevalence and types of intestinal parasites in the pediatric population of Al-Baha region, Saudi Arabia. Stool samples were randomly collected from 19,939 children of whom 4208 (21.1%) were found to harbour intestinal parasites. The most affected age group was 5-9 years and the sex distribution was almost equal in all age groups. Specific prevalence rates were Giardia lamblia 9 per cent, entamoeba histolytica 5 per cent, Hymenolepis nana 2 per cent, and Enterobius vermicularis 2 per cent. The findings of this survey confirm the extremely complex nature of parasitic profile in developing communities, and indicate that relationships exist between cultural and ecological factors, sanitation, and observed pattern of intestinal parasites.

Adolescent↗
PubMed2002

National MOTTEP: educating to prevent the need for transplantation. Minority Organ Tissue Transplant Education Program.

The purpose of this study was to determine whether participation in culturally appropriate, community-developed, health education programs addressing organ/tissue donation and preventing the need for transplantation, is an effective strategy for contributing to sustained behavior change among members of minority population groups. Within 15 target cities, 800 (40%) minority participants consented to a 2-3 month telephone follow-up survey. The 5-item questionnaire using items extracted from the pre- and post-survey instrument, addressed: 1) knowledge and beliefs; 2) willingness to sign donor cards and have family discussions; and 3) prevention/health behaviors. The preliminary findings based on telephone interviews with 253 participants indicate the following: [table: see text] The conclusions indicate that the community-based, culturally appropriate health education strategies used contributed to and sustained behavior changes.

Attitude to Health↗
PubMed1996

Evaluation of a national health promotion program in South Australia.

This paper reports the findings of the evaluation of the South Australian component of the National Better Health Program. The evaluation used analysis of focus-group interviews and key documents to assess the value of the state program. The evaluation demonstrated that for a relatively small investment ($2.4 million was allocated to the project over four years, representing only 0.5 per cent of the annual budget for teaching hospitals in South Australia), much can be achieved by harnessing the energy of local communities. The evaluation concluded that more attention should be directed to structural change, with an emphasis on collaboration across sectors, and community participation. Some key issues for the planning and implementation of health promotion were highlighted: the challenge of marrying local initiatives based on community development with national health promotion objectives; the importance of dedicated and assured funding; the need for increased training and support for health promotion workers; and the importance of continuing a focus on equity in the implementation of health promotion. The paper concludes by questioning the value of the current Australian goals, targets and strategies for health, given the findings from this evaluation.

Community Participation↗
PubMedDate not supplied

Diabetes education project: community networking in rural Utah.

People in rural areas often lack the financial resources, workforce, and professional network needed to sustain a diabetes education pro gram in their own community. HealthInsight, a nonprofit organization that works to improve the quality of health care in its community, developed a 2-day seminar in an effort to facilitate the networking of rural health professionals who educate patients with diabetes and to help those educators better learn how to use existing resources. Participants included nurses, dietitians, diabetes educators, quality managers, and education directors from hospitals and home health agencies in both rural and metropolitan areas. Speakers presented information on a variety of topics related to program development, and a resource manual containing numerous materials was given to each participant. At the end of the seminar, the group turned in goals for their own programs. Too often, providers of health care compete rather than collaborate with one another. There is a great need for such networking opportunities among health care professionals working on common goals--especially in rural areas.

Community Networks↗
PubMed1999

Implementing new health visiting services through action research: an analysis of process.

An action research project based in a single fundholding practice on the South Coast of England aimed to identify needs relevant to families with resident children, then to use the contracting system to redirect health visiting practice to meet those needs. The naïvety of this plan was well recognised, so the processes that occurred during implementation of the proposed changes were recorded throughout. An analysis of these participant observation data revealed various organisational constraints and facilitators that arose during contract negotiations. Two new full time health visiting posts were established, each with an innovative and somewhat controversial focus. One health visitor was employed to establish a community development project in an underserved area of the town, while the other was to provide a home visiting service for the families of school aged children. The processes involved in structuring decisions about 'health needs' and how these are best met are analysed for each of the two new posts. The analysis reveals powerful influences that affect the implementation of new health visiting services.

Child↗
PubMed2006

Towards a conceptual and operational union of bacterial systematics, ecology, and evolution.

To completely understand the ecology of a bacterial community, we need to identify its ecologically distinct populations (ecotypes). The greatest promise for enumerating a community's constituent ecotypes is held by molecular approaches that identify bacterial ecotypes as DNA sequence clusters. These approaches succeed when ecotypes correspond with sequence clusters, but some models of bacterial speciation predict a one-to-many and others a many-to-one relationship between ecotypes and sequence clusters. A further challenge is that sequence-based phylogenies often contain a hierarchy of clusters and subclusters within clusters, and there is no widely accepted theory to guide systematists and ecologists to the size of cluster most likely to correspond to ecotypes. While present systematics attempts to use universal thresholds of sequence divergence to help demarcate species, the recently developed 'community phylogeny' approach assumes no universal thresholds, but demarcates ecotypes based on the analysis of a lineage's evolutionary dynamics. Theory-based approaches like this one can give a conceptual framework as well as operational criteria for hypothesizing the identity and membership of ecotypes from sequence data; ecology-based approaches can then confirm that the putative ecotypes are actually ecologically distinct. Bacterial ecotypes that are demonstrated to have a history of coexistence as ecologically distinct lineages (based on sequence analysis) and as a prognosis of future coexistence (based on ecological differences), are the fundamental units of bacterial ecology and evolution, and should be recognized by bacterial systematics.

Bacteria↗
PubMed1991

Breast feeding and protection against neonatal sepsis in a high risk population.

Protection against neonatal sepsis by breast feeding was investigated in a developing community. A case-control study was carried out with 42 cases from a hospital and 270 controls, matched for age and socioeconomic conditions from the community. Exclusive breast feeding was extremely rare, most babies being partially breast fed and a few being given formula feed or animal milk. A highly significant odds ratio of 18 was obtained, showing that even partial breast feeding protects against neonatal sepsis in such a population.

Bacterial Infections↗
PubMed2002

Protobranch bivalves.

The subclass Protobranchia comprises more than 600 species of bivalves that occur throughout the world ocean. Mostly deposit feeders in soft sediments, they are abundant in the deep sea. Apomorphies that unite them as a group include gill structure, hinge conformation, shell microstructure, larval development, foot morphology, respiratory pigments, trophic mode and digestion. They are relatively small and highly conserved in form, originating in the Cambrian era. They may represent an ancestral, derived or paraphylectic group of the Bivalvia. The protobranchs include two orders, the Nuculoida and Solemyoida, which previously were classified separately in the subclasses Paleotaxodonta and Cryptodonta, respectively. They are of ecological interest and have a unique functional morphology. They feed mostly under the surface of the sediment with highly modified labial palps, but the degree to which they are selective in diet remains difficult to determine. They are important bioturbators in many soft-sediment assemblages; their feeding and locomotion affects sediment structure and community development. Solemyoids are unusual in inhabiting reducing environments and hydrocarbon seeps and in deriving their nutrition from endosymbiotic chemosynthetic bacteria. A variety of species of protobranchs are found in oceanic trenches, near hydrothermal vents, and in submarine caves. Protobranchs produce a lecithotrophic larval stage, the pericalymma, making their development unique among bivalves. The pericalymma remains in the plankton for a short time and presumably has low dispersal ability. Recruitment may be intermittent. Growth is rapid in post-larvae but decreases with age, though rates may not necessarily be slow, especially in continental shelf species. Life spans are commonly 1 to 2 decades, but deep-sea representatives may grow more slowly and live longer. Bottom fish, seastars and gastropods are their major predators and a few parasites and commensals have been documented. The predominance of protobranchs in deep-sea sediments may be a result of deep-sea origin or displacement from shallow waters by lamellibranchs. Their ability to deposit-feed, digest food extracellularly, and develop by means of lecithotrophic larvae make them particularly well adapted to cold and oligotrophic habitats.

Animals↗
PubMed2000

Application of sequence-specific labeled 16S rRNA gene oligonucleotide probes for genetic profiling of cyanobacterial abundance and diversity by array hybridization.

DNA sequence information for the small-subunit rRNA gene (16S rDNA) obtained from cyanobacterial cultures was used to investigate the presence of cyanobacteria and their abundance in natural habitats. Eight planktonic communities developing in lakes characterized by relatively low algal biomass (mesotrophic) and in lakes with correspondingly high biomass (eutrophic) were selected for the study. The organismal compositions of the water samples were analyzed genetically, using multiplex sequence-specific labeling of oligonucleotide probes targeted to 16S rDNA and subsequent hybridization of the labeled probes to their respective complements spotted onto a solid support (DNA array). Ten probes were established to determine the relative abundances of the discernible cyanobacteria encountered in the selected lakes. The probes were generally specific for their targets, as determined through analyses of clone cultures. Reproducible abundance profiles were established for the lakes investigated in the subsequent analyses of natural cyanobacterial communities. The results from the genetic analyses were then compared with information obtained from standard hydrobiological and hydrochemical analyses. Qualitatively, there were relatively good correlations among the groups of organisms (Nostoc, Microcystis, and Planktothrix species) found in the different lakes. The levels of correlation were lower for the quantitative data. This may, however, be due to differences in sample processing technique. The conclusions from these comparisons are that the genetic abundance profiles may provide a foundation for separating and quantifying genetically distinct groups of cyanobacteria in their natural habitats.

Cyanobacteria↗
PubMed2004

Trophic cascades in rocky shore tide pools: distinguishing lethal and nonlethal effects.

The effects of predators on the density of their prey can have positive indirect effects on the abundance of the prey's resource via a trophic cascade. This concept has strongly influenced contemporary views of how communities are structured. However, predators also can transmit indirect effects by inducing changes in prey traits. We show that the mere presence of predator risk cues can initiate a trophic cascade in rocky shore tide pools. In large (mean surface area =9 m2), natural tide pools, we manipulated crab density and their foraging ability to examine the relative importance of lethal (density-mediated) and non-lethal (trait-mediated) predator effects to algal community development. We found that perceived predation risk reduced snail density as much as the direct predation treatment, showing that green crab predation was not an important factor regulating local snail density. Instead, snail emigration away from resident crabs appears to be the most important factor regulating local snail density. As a result, the abundance of ephemeral green algae was similar in the predation risk and direct predation treatments, suggesting that the consumption of snails by crabs plays a minimal role in mediating the trophic cascade. Increased attention to trait-mediated effects that are transmitted by predator-induced changes in prey behavior may change our view of how predators exert their strong influence on community structure.

Analysis of Variance↗
PubMed1995

Beyond the schools: strategies for implementing successful drug prevention programs in community youth-serving organizations.

This article discusses why community-based youth-serving organizations are natural settings for drug prevention programming. Based on a three-year study of a school-based drug prevention program adapted to the Boys & Girls Club setting and serving high-risk youths, we identify organizational impediments to implementing a structured prevention program in youth organizations. We also present some strategies the clubs used to achieve success in a nonschool setting where program participation is voluntary. Strategies include: 1) employing a team approach and making program institutionalization a goal; 2) choosing the "right" prevention program leader; 3) creating a special prosocial bonding group for program youths; 4) involving program graduates as recruiters and positive role models; and 5) developing community support. Drug prevention programming in youth-serving organizations can reinforce, supplement, and enhance school-based prevention efforts, thus providing communities with important drug prevention alternatives that go beyond the schools.

Adolescent↗
PubMed1991

Cultural diagnosis of chancroid.

Culture of Haemophilus ducreyi remains the definitive way to diagnose chancroid. Since its discovery in 1889, cultural isolation of this fastidious organism has been a challenge for clinicians and microbiologists. A recent chancroid epidemic in our locale prompted a review of available culture techniques. Despite the development of various selective solid media in the last 20 years, cultural diagnosis of chancroid remains problematic. Many pitfalls may complicate this procedure, such as concomitant syphilis, syphilis, or herpes progenitalis simulating chancroid, strain differences in nutritional requirements, improper handling and delayed inoculation of clinical specimens, use of suboptimal growth conditions, and vancomycin hydrochloride-sensitive organisms. Highest cultural yield will be obtained by using enriched gonococcal agar base and enriched Müeller-Hinton agar in a biplate fashion. As most isolates are sensitive to vancomycin, incorporation of this antibiotic should be routine. However, screening for vancomycin-sensitive organisms is indicated when negative cultures are repeatedly obtained from clinically typical cases originating from the same community. Development of immunodiagnostic and DNA probe tests is underway.

Bacteriological Techniques↗