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PubMed2000

Local, possibly contact-mediated signalling restricted to homotypic neurons controls the regular spacing of cells within the cholinergic arrays in the developing rodent retina.

In the vertebrate retina neurons of the same type commonly form non-random arrays, assembled by unknown positional mechanisms during development. Computational models in which no two cells are closer than a minimal distance, simulate many retinal arrays. These findings have important biological implications, since they suggest that cells are determined as neurons of specific types before entering their arrays, and that local, possibly contact-mediated interactions acting exclusively among the elements of an array account for its assembly. This is here verified by combining experimental manipulations in normal and transgenic models with computational analysis for the cholinergic mosaics, the only arrays so far for which the development of spatial ordering is known quantitatively. When generalised, these findings suggest a plan for vertebrate retinal patterning, where homotypic interactions organise retinal arrays first, then local interactions between synaptic partners suffice to establish the topographical connections that support retinal processing.

Acetylcholine↗
PubMedDate not supplied

[Talking about sex: the social and familial net as a base for sexual and reproductive health promotion among adolescents].

This study aimed to assess whom adolescents shared information and dialogues about sexuality with. Therefore, 383 fifteen to nineteen year-old adolescents enrolled in a family health unit in the city of São Paulo (Brazil) were interviewed in 2002. Adolescents most frequently seemed to talk about sex with peers, although they lost priority according to the complexity of the theme. Thus, teachers and health professionals were mainly indicated as a reference when talking about std/aids. For 20% of the adolescents, parents were the main persons to get information from, no matter the subject. The results indicated that this entire social and family network should be incorporated as partners in sexual and reproductive health promotion among adolescents.

Adolescent↗
PubMedDate not supplied

HIS-PACS coupling: BAZIS/ZIS and Philips/MARCOM on speaking terms.

Nowadays a growing number of experts in the PACS field agree on the necessity of having an integrated HIS-PACS combination available in modern hospitals in order to manage the enormous amounts of patient data, both textual, numerical and image information, in an effective way. Since 1986 BAZIS (the Development and Support Group of the Hospital Information System), Philips Medical Systems and the University Hospital of Utrecht (AZU) are partners in the so-called Dutch PACS Project in the development and evaluation of a fully integrated image information system. The first phase of the coupling (sub)project consists of establishing a communication link between the BAZIS/ZIS and the Philips/MARCOM system with the following restrictions: the only data sent concerns the inpatients of one ward; data will only flow one way, from BAZIS/ZIS to Philips/MARCOM. In the second phase two-way communication will be realized and more departments can be part of the experiment. In phase 3 a more general HIS-PACS interface will be developed, independent of the manufacturers of HIS and PACS. In this paper the technical solution chosen for the first phase coupling, the format of the messages being transferred, and the events which result in sending the messages, will be described. Also, reference is made to the demonstration of the working HIS-PACS link, given during the 6th EuroPACS meeting in Utrecht and Leiden on 25-26 April 1988.

Computer Communication Networks↗
PubMed2001

Connexin-43 interactions with ZO-1 and alpha- and beta-tubulin.

Gap junctions are composed of connexins that form transmembrane channels between adjacent cells. The C-terminal tail of connexin-43 (Cx43), the most widely expressed connexin member, has been implicated in the regulation of Cx43 channel gating. Interestingly, channel-independent processes regulated by Cx43 have also been postulated. In our studies to elucidate the mechanism of Cx43 channel gating by growth factors and to explore additional functions of gap junctions, we have identified three interacting partners of the C-terminal tail of Cx43 (Cx43CT). (i) the c-Src tyrosine kinase, which phosphorylates Cx43CT and is involved in G protein-mediated inhibition of Cx43 gap junctional communication. (ii) the ZO-1 'scaffold' protein, which might recruit signaling proteins into Cx43-based gap junctions. (iii) microtubules (consisting of alpha/beta-tubulin dimers), which extend with their distal ends to Cx43-based gap junctions, suggesting that Cx43 gap junctions may play a novel role in regulating microtubule stability in contacted cells. Here we show that Cx43 binds alpha-tubulin equally well as beta-tubulin. In addition, we show that the second, but not the first, PDZ domain of ZO-1 binds directly to Cx43, and we confirm that the very C-terminal isoleucine residue of Cx43 is critical for ZO-1 binding.

Carcinoma↗
PubMed2003

Caribbean Public Health Laboratory Surveillance Project: a Department of Defense-sponsored humanitarian mission.

This report describes a Department of Defense humanitarian assistance project to develop and build a regional computer-assisted laboratory-based electronic disease surveillance system in the Caribbean basin. From 1997 through 2000, the project donated 146 computer systems and trained more than 250 personnel from 14 ministries of health to operate this system. This humanitarian mission provided the region with a sustainable and locally maintained and operated surveillance system having a broad and long-term impact on public health. It has improved data gathering, analysis, and reporting at the local, national, and regional level. Benefits to the region include the dissemination through the Internet of increasingly timely and accurate information on the incidence and prevalence of endemic, epidemic, and newly emerging diseases. This serves the Caribbean residents, travelers, and U.S. national interests. The project is a model for cooperative Department of Defense capacity building and training programs in support of partner countries and international public health agencies.

Altruism↗
PubMed1983

[Behavioral approach to sexual dysfunctions].

The basic principles of those behaviourist approaches are: - Treatment of the couple, no matter which partner is apparently "responsible" for the sexual problem, and mutual involvement of both partners. - Sexual information and education regarding the cycle of sexual response, anatomy, biology, and sexual techniques. - Changing negative attitudes vis-à-vis sexuality. - Elimination of sexual anxieties. - Improvement of verbal and corporal communication within the couple. - Learning to know oneself and others better--Initiation to psychological attention and observation.

Anxiety↗
PubMedDate not supplied

Advocacy: the cornerstone of cancer survivorship.

PURPOSE: This article describes a cancer-related advocacy skill set that can be acquired through a learning process. OVERVIEW: Cancer survivorship is a process rather than a stage or time point, and it involves a continuum of events from diagnosis onward. There exists little consensus about what underlying processes explain different levels of long term functioning, but skills necessary for positive adaptation to cancer have been identified from both the professional literature and from the rich experiences of cancer survivors. CLINICAL IMPLICATIONS: Healthcare practitioners need to be more creative and assertive in fostering consumer empowerment and should incorporate advocacy training into care plans. Strategies that emphasize personal competency and increase self-advocacy capabilities enable patients to make the best possible decisions for themselves regarding their cancer care. In addition, oncology practitioners must become informed advocacy partners with their patients in the public debate about healthcare and cancer care delivery.

Adaptation, Psychological↗
PubMed1999

Practice patterns for the elicitation of sexual history, education, and counseling among providers of STD services: results from the gonorrhea community action project (GCAP).

BACKGROUND: The frequently asymptomatic nature and high incidence of severe complications of sexually transmitted diseases (STD) calls for targeted efforts to identify those at greatest risk. Earlier studies have shown inconsistencies regarding STD evaluation by primary care clinicians and physicians. However, the literature regarding the consistency of practice patterns regarding elicitation of sexual history is limited. We examined practice patterns for the elicitation of sexual history among providers across seven sites nationwide. METHODS: As part of a multisite study to encourage health seeking for populations specifically at risk for gonorrhea (GC) and other STDs, semistructured interviews that included questions regarding sexual history elicitation were conducted with 208 service providers in a total of 121 publicly and privately funded clinics, managed care organizations (MCOs), hospital clinics, community- and school-based clinics in Denver, New York, Los Angeles, Birmingham, St. Louis, Indianapolis, and Prince Georges County, MD. RESULTS: Among the providers interviewed, practice patterns for the elicitation of sexual history were inconsistent. Sexual histories were described as routine (i.e., solicited from every client regardless of reason for visit) in 57% of sites. Providers most frequently asked clients their number of sex partners (57%), their contraceptive history (55%), and STD history (34%). Client discomfort among 46% and provider discomfort among 13% was cited as barriers to the elicitation of sexual history. A quarter (26%) of providers agreed that the elicitation of sexual history can be fostered by improved provider communication skills and 16% agreed increasing training and experience for providers is needed. CONCLUSIONS: These findings suggest that interventions with providers to standardize sexual history elicitation can help to reduce barriers to prevention, diagnosis, and treatment of STD.

Counseling↗
PubMed2006

Astrocyte calcium waves: what they are and what they do.

Several lines of evidence indicate that the elaborated calcium signals and the occurrence of calcium waves in astrocytes provide these cells with a specific form of excitability. The identification of the cellular and molecular steps involved in the triggering and transmission of Ca(2+) waves between astrocytes resulted in the identification of two pathways mediating this form of intercellular communication. One of them involves the direct communication between the cytosols of two adjoining cells through gap junction channels, while the other depends upon the release of "gliotransmitters" that activates membrane receptors on neighboring cells. In this review we summarize evidence in favor of these two mechanisms of Ca(2+) wave transmission and we discuss that they may not be mutually exclusive, but are likely to work in conjunction to coordinate the activity of a group of cells. To address a key question regarding the functional consequences following the passage of a Ca(2+) wave, we list, in this review, some of the potential intracellular targets of these Ca(2+) transients in astrocytes, and discuss the functional consequences of the activation of these targets for the interactions that astrocytes maintain with themselves and with other cellular partners, including those at the glial/vasculature interface and at perisynaptic sites where astrocytic processes tightly interact with neurons.

Adenosine Triphosphate↗
PubMed2002

Perceived verbal conflict behaviors associated with physical aggression and sexual coercion in dating relationships: a gender-sensitive analysis.

We studied perceived partner verbal behaviors associated with participants' use of dating aggression. Men's reports of their partners' demanding, controlling, and psychologically abusive behaviors during conflicts were expected to predict men's perpetration against partners. In contrast, women's reports of their partners' withdrawal were expected to predict women's perpetration. Data were collected from heterosexual undergraduates (N = 223) in exclusive dating relationships. Participants' reports of partner demands and partner psychological abuse were associated with participants' use of physical aggression and sexual coercion. Reports of partner withdrawal and partner controlling behaviors were associated with participants' sexual coercion only. Significant moderating effects of gender emerged. As expected, partner demands, controlling behaviors, and psychological abuse were associated with physical aggression and sexual coercion in men, but not women. Partner withdrawal was associated with sexual coercion in both women and men. We conclude that gender-sensitive approaches are necessary to understand and prevent verbal conflict patterns associated with physical aggression and sexual coercion in intimate relationships.

Adolescent↗
PubMed2006

Cost-effectiveness of environmental-structural communication interventions for HIV prevention in the female sex industry in the Dominican Republic.

Behavior change communication often focuses on individual-level variables such as knowledge, perceived risk, self-efficacy, and behavior. A growing body of evidence suggests, however, that structural interventions to change the policy environment and environmental interventions designed to modify the physical and social environment further bolster impact. Little is known about the cost-effectiveness of such comprehensive intervention programs. In this study we use standard cost analysis methods to examine the incremental cost-effectiveness of two such interventions conducted in the Dominican Republic in sex establishments. In Santo Domingo the intervention was environmental; in Puerto Plata it was both environmental and structural (levying financial sanctions on sex establishment owners who failed to follow the intervention). The interventions in both sites included elements found in more conventional behavior change communication (BCC) programs (e.g., community mobilization, peer education, educational materials, promotional stickers). One key aim was to examine whether the addition of policy regulation was cost-effective. Data for the analysis were gleaned from structured behavioral questionnaires administered to female sex workers and their male regular paying partners in 41 sex establishments conducted pre- and post-intervention (1 year follow-up); data from HIV sentinel surveillance, STI screening results conducted for the intervention; and detailed cost data we collected. We estimated the number of HIV infections averted from each of the two intervention models and converted these estimates to the number of disability life years saved as compared with no intervention. One-way, two-way, three-way, and multivariate sensitivity analysis were conducted on model parameters. We examine a discount rate of 0%, 3% (base case), and 6% for future costs and benefits. The intervention conducted in Santo Domingo (community mobilization, promotional media, and interpersonal communication) was estimated to avert 64 HIV infections per 10,000 clients reached, and resulted in a cost per disability-adjusted life year (DALY) saved of $1,186. In Puerto Plata a policy/regulatory intervention was added, which resulted in 162 HIV infections averted per 10,000 clients reached, and yielded a cost per DALY saved of $457. Cost-effectiveness estimates were most correlated to the discount rate used and base rates of sexually transmitted infection (which affects the HIV transmission rate). Both intervention models resulted in cost-effective outcomes; however, the intervention that included policy regulation resulted in a substantially more cost-effective outcome.

Cost-Benefit Analysis↗
PubMed2002

[Interactive processes in video-mediated referential communication].

This study examined interactive processes that occurred in video-mediated referential communication task. Pairs of participants were assigned to one of four conditions; in a room with partition, or in separate rooms linked by telephone with three levels of noise interference (none, low, and high). In all conditions, a video-monitor link allowed the participants to see the upper body of their partner. Analyses of gestural and visual interaction revealed that participants in partition and no-interference conditions did not rely on the visual channel, while those in the others frequently looked at the monitor. Furthermore, gestural references appeared especially in high-noise condition. Qualitative analyses of conversations showed that participants in high-noise condition relied more on demonstrative references, and used more metaphoric expressions of a whole referent, based on the common ground shared by the pair. These results are discussed in terms of how people collaboratively interact and construct a shared context for communication between them.

Adult↗
PubMed2000

Sexually transmitted diseases and the increased risk for HIV transmission: implications for cost-effectiveness analyses of sexually transmitted disease prevention interventions.

We estimated the annual number and cost of new HIV infections in the United States attributable to other sexually transmitted diseases (STDs). We used a mathematical model of HIV transmission to estimate the probability that a given STD infection would facilitate HIV transmission from an HIV-infected person to his or her partner and to calculate the number of HIV infections due to these facilitative effects. In 1996, an estimated 5,052 new HIV cases were attributable to the four STDs considered here: chlamydia (3,249 cases), syphilis (1,002 cases), gonorrhea (430 cases), and genital herpes (371 cases). These new HIV cases account for approximately $985 million U.S. in direct HIV treatment costs. The model suggested that syphilis is far more likely than the other STDs (on a per-case basis) to facilitate HIV transmission. This analysis provides a framework for incorporating STD-attributable HIV treatment costs into cost-effectiveness analyses of STD prevention programs.

Chlamydia Infections↗
PubMed1996

Pointing and social awareness: declaring and requesting in the second year.

The production of pointing and other gestures (e.g. reaching or indicative gestures) by 47 infants aged 1;0 to 1;6 was investigated in two experiments contrasting declarative-referential vs. imperative-instrumental conditions of communication. A further group of seven infants aged 0;10 was examined in order to highlight pre-pointing transitional phenomena. Data analyses concerned gestures and associated vocalizations and visual checking with a social partner. Results show that gestures are produced differentially in the experimental conditions: while reaching is only produced in imperative-instrumental contexts, pointing is characteristic of declarative-referential contexts. The pattern of visual checking with the social partner also differentiates gestures; moreover, it shows developmental changes in the case of pointing. Results suggest that pointing relies on some awareness of 'psychological' processes (e.g. attention and sharing) in the other and the self, and that it is this which may account for the specific relevance of pointing for language development.

Awareness↗
PubMed2006

Mutations in the gene encoding the synaptic scaffolding protein SHANK3 are associated with autism spectrum disorders.

SHANK3 (also known as ProSAP2) regulates the structural organization of dendritic spines and is a binding partner of neuroligins; genes encoding neuroligins are mutated in autism and Asperger syndrome. Here, we report that a mutation of a single copy of SHANK3 on chromosome 22q13 can result in language and/or social communication disorders. These mutations concern only a small number of individuals, but they shed light on one gene dosage-sensitive synaptic pathway that is involved in autism spectrum disorders.

Autistic Disorder↗
PubMed1998

The role of the family system in HIV risk reduction: youths with hemophilia and HIV infection and their parents. Adolescent Hemophilia Behavioral Intervention Evaluation Project (HBIEP) Study Group.

OBJECTIVE: To examine the relationship between family communication and HIV risk reduction behaviors among a multisite sample of 125 male youths (ages 12-25) with hemophilia and HIV- infection, as well as their parents. METHODS: Participants completed self-report surveys assessing communication and attitudes regarding HIV risk reduction interventions; adolescents also provided data about their sexual behaviors. RESULTS: Adolescents with parents who discuss sexual issues were more likely to report HIV status disclosure to sexual partners. Most parents were supportive of HIV risk reduction interventions for their adolescents, but the youths themselves tended to endorse only interventions that offered opportunities for recreational activities and socialization with peers. CONCLUSIONS: Findings are discussed in terms of intervention implications and the need for family systems-based programs.

Adolescent↗
PubMed2005

Abortion disclosure and the association with domestic violence.

OBJECTIVE: To estimate the rate at which women disclose abortion to their partners and examine the association between domestic violence and partner disclosure. METHODS: A cross-sectional cohort study was performed on women presenting for elective termination of pregnancy to a single clinic in Houston, Texas. Subjects were offered an anonymous, self-administered questionnaire. The 15-question survey addressed disclosure of abortion to the partner, reasons for nondisclosure if applicable, and physical and sexual abuse using a modified Abuse Assessment Screen. RESULTS: Of 960 patients, 85.2% completed the survey, for a final sample size of 818. Overall, 139 (17.2%) of subjects chose not to disclose the abortions to their partners, and 14% of patients reported abuse within the past year. Physical or sexual abuse or both was twice as common among nondisclosers (23.7% compared with 12.0%, P = .001). Among nondisclosers, 63 (45.3%) said the relationship with the partner had no future, 52 (37.4%) did not feel obliged to notify their partners, 29 (20.9%) said the partner would oppose the abortion, and 11 (7.9%) said disclosure would result in physical harm. CONCLUSION: In this urban, racially and socioeconomically diverse population, 17.2% of women concealed pregnancy terminations from their partners. Although relationship instability and personal choice were cited as the most frequent reasons for nondisclosure, the rate of domestic abuse was twice as high in this group and may have adversely affected open communication. Of greatest concern, a subset of nondisclosers reported the direct fear of personal harm as the primary reason for nondisclosure.

Abortion, Induced↗