Nerve growth factor enhances Clara cell proliferation after lung injury.

The lung epithelia facilitate wound closure by secretion of various cytokines and growth factors. Nerve growth factor (NGF) has been well described in airway inflammation; however, its likely role in lung repair has not been examined thus far. To investigate the repair function of NGF, experiments were performed in vitro using cultured alveolar epithelial cells and in vivo using a naphthalene-induced model of Clara epithelial cell injury. Both in vitro and in vivo experiments revealed airway epithelial cell proliferation following injury to be dependent on NGF and the expression of its receptor, tropomyosin-receptor-kinase A. Additionally, NGF also augmented in vitro migration of alveolar type II cells. In vivo, transgenic mice over-expressing NGF in Clara cells (NGFtg) did not reveal any proliferation or alteration in Clara cell phenotype. However, following Clara cell specific injury, proliferation was increased in NGFtg and impaired upon inhibition of NGF. Furthermore, NGF also promoted the expression of collagen I and fibronectin in vitro and in vivo during repair, where significantly higher levels were measured in re-epithelialising NGFtg mice. Our study demonstrates that NGF promotes the proliferation of lung epithelium in vitro and the renewal of Clara cells following lung injury in vivo.

Information access in a dual-task context: testing a model of optimal strategy selection.

Pilots were required to access information from a hierarchical aviation database by navigating under single-task conditions (Experiment 1) and when this task was time-shared with an altitude-monitoring task of varying bandwidth and priority (Experiment 2). In dual-task conditions, pilots had 2 viewports available, 1 always used for the information task and the other to be allocated to either task. Dual-task strategy, inferred from the decision of which task to allocate to the 2nd viewport, revealed that allocation was generally biased in favor of the monitoring task and was only partly sensitive to the difficulty of the 2 tasks and their relative priorities. Some dominant sources of navigational difficulties failed to adaptively influence selection strategy. The implications of the results are to provide tools for jumping to the top of the database, to provide 2 viewports into the common database, and to provide training as to the optimum viewport management strategy in a multitask environment.

Provision of free and discounted dental services to selected populations: a survey of attitudes and practices of dentists attending the 1996 Dallas Midwinter Meeting.

An attitudes and practices survey of dentists attending the Dallas Midwinter Meeting in January 1996 in Dallas was conducted as a collaborative effort between the Dallas County Dental Society and the Baylor College of Dentistry. The survey was developed to help determine participating dentists' attitudes and practices in the area of provision of dental services on a discounted or free basis to disadvantaged patient groups. A total of 225 dentists responded to the survey. Of these surveyed dentists, 213 (94.6%) were in private practice and 199 (88.4%) described themselves as general dentists. A considerable amount of charitable dental services, discounted and free, was reported to be provided by the group of respondent dentists. A total of 152 (67.6%) of the dentists surveyed reported providing discounted or free care to elderly patients with low income, 125 (55.6%) provided such care to low-income patients without age restriction, and 137 (60.9%) cared for patients of record with temporary financial hardship. In other patient categories, 79 (35.1%) of the dentists provided free/discounted services to handicapped persons and 47 (20.9%) provided care to homebound patients. These findings concerning charitable practices by dentists were similar to those found in a comparable survey conducted by the American Dental Association in 1994. Dentists were fairly evenly split as to their preference where to volunteer services. Of the total respondents, 84 (40.6%) preferred providing services in their own office and 91 (44.0%) preferred to do so at a community health clinic that hosted volunteers.

Distance and organization in multifunction displays.

One approach to organizing information in a multifunction display (MFD) is to place related screens of information closer to each other. This study identified three metrics that could be used to operationalize the concept of distance in an MFD. The proposed distance metrics-navigational (the number of choice points lying between two screens), organizational (the hierarchical structure of the data base), and the cognitive (the user's perception of relationships among screens)-were empirically examined by using a simulated, hierarchically arranged, menu-driven MFD in an aviation context. Subjects engaged in two tasks that required them to access different target screens from various starting screens in a 290-screen MFD. The tasks differed in the navigational mechanisms subjects were allowed to use to navigate around the MFD and the relationships between the starting and target screens. The results suggest that the three distance metrics are meaningful within the context of a multifunction display.

Predictors of recidivism in Australian juvenile sex offenders: implications for treatment.

Juvenile sex offenders charged with their first sexual offense were compared with recidivist juvenile sex offenders who had been charged with more than one sexual offense on a number of factors related to sexual offending. Participants were 70 male juvenile sex offenders, aged 13-21 years who were awaiting court disposition. Negative family history, negative family characteristics, school and learning problems, social skill deficits, deviant sexual experiences, deviant sexual fantasies, and cognitive distortions were assessed for their direct and mediating roles in recidivism. Path analysis indicated that poor social skills, learning problems, and deviant sexual experiences were causally related to recidivism of sexual offending. Poor social skills were directly related to recidivism, whereas cognitive distortions and deviant sexual fantasies mediated the role of learning problems and deviant sexual experiences. There was a significant association between deviant sexual experience and learning problems. The findings support the role of cognitive distortions and deviant sexual fantasies in recidivist sexual offending for this sample. The causal role identified for poor social skills and learning problems in recidivism for sexual offending has implications for treatment and therefore deserves further attention.

[Unplanned discharge in a psychiatric day clinic - argument for an individualized approach]. / Behandlungsabbruch in der psychiatrischen Tagesklinik - Plädoyer für eine differenzierte Betrachtungsweise.

OBJECTIVE: Drop-outs, respectively unplanned discharges in psychiatric therapy are often explained by so-called lack of insight into the disease or difficult circumstances of admission. We were interested in the question how often drop outs are noticed in a voluntarily day clinic setting where nearly all psychiatric diseases are treated. METHOD: The charts of all patients discharged in 1998 (n = 65) were screened referring to their mode of discharge. RESULTS: 31 patients (47.7 %) regularly ended their treatment. An unplanned discharge was registered with 34 patients (52.3 %). CONCLUSIONS: The statistically relevant term of drop-out does not appear to be the right one to deal with the individual treatment situation and the motivation for the limitation of treatment. A typology of prematurely ended therapies is developed.

A novel approach to temporary stenting: degradable cardiovascular stents produced from corrodible metal-results 6-18 months after implantation into New Zealand white rabbits.

OBJECTIVE: To determine whether corrodible materials may be safely used as biodegradable cardiovascular implants. DESIGN: Corrodible iron stents (> 99.8% iron) were produced from pure iron and laser cut with a stent design similar to a commercially available permanent stent (PUVA-AS16). A total of 16 NOR-I stents were implanted into the native descending aorta of 16 New Zealand white rabbits (mean luminal diameter at the implantation site 3.4 mm, balloon diameter to vessel diameter ratio 1.13). RESULTS: No thromboembolic complications and no adverse events occurred during the follow up of 6-18 months. All stents were patent at repeat angiography after 6 (n = 9), 12 (n = 5), and 18 months (n = 2) with no significant neointimal proliferation, no pronounced inflammatory response, and no systemic toxicity. CONCLUSIONS: This initial in vivo experience suggests that degradable iron stents can be safely implanted without significant obstruction of the stented vessel caused by inflammation, neointimal proliferation, or thrombotic events.