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Biomedical subjects

E W Wong

Publications and source records attributed to E W Wong.

7 recordsLinked to original sources
PubMed2001

Molecular-based electronically switchable tunnel junction devices.

Solid-state tunnel junction devices were fabricated from Langmuir Blodgett molecular monolayers of a bistable [2]catenane, a bistable [2]pseudorotaxane, and a single-station [2]rotaxane. All devices exhibited a (noncapacitive) hysteretic current-voltage response that switched the device between high- and low-conductivity states, although control devices exhibited no such response. Correlations between the structure and solution-phase dynamics of the molecular and supramolecular systems, the crystallographic domain structure of the monolayer film, and the room-temperature device performance characteristics are reported.

Journal Article↗
PubMed1984

The growth of cultured human foreskin keratinocytes is not stimulated by a tumor promoter.

The tumor promoter 12-O-tetradecanoyl phorbol-13-acetate (TPA) does not stimulate the growth of human epidermal cells in foreskin explant cultures; a dose-dependent inhibition is seen at doses higher than 10(-5) micrograms/ml. TPA also inhibits epidermal growth factor-stimulated growth and does not induce ornithine decarboxylase activity or increase polyamine levels. This is not due to the rapid breakdown of TPA, since TPA is not metabolized to any appreciable extent.

Cell Division↗
PubMed1983

A novel process for the manufacturing of porous grafts: process description and product evaluation.

A novel process has been developed for the manufacture of porous vascular grafts from solutions or melts of polymers. It allows the manufacture of grafts with controllable porosity, pore size, and mechanical properties. In this process, the polymer melt or polymer solution is extruded through fine orifices; the fibers are then stretched and wound on a rotating mandril. Fiber-fiber bonding takes place, resulting in the formation of stable porous tubes. The effects of the process variables on the physical properties of the resulting graft have been studied and preliminary in vivo evaluation in dogs has demonstrated graft patency with a thin, stable neointima in both small (4 mm) and large (10 mm) caliber configurations.

Animals↗
PubMed1980

An outbreak of Legionnaires' disease associated with a contaminated air-conditioning cooling tower.

In August and September 1978, an outbreak of Legionnaires' disease occurred in Memphis, Tennessee. Of the 44 ill, 39 had been either patients, employees, visitors, or passers-by at one Memphis hospital (Hospital A) during the 10 days before. Assuming an incubation period of between two and 10 days, the onset of cases correlated precisely with the use of Hospital A's auxiliary air-conditioning cooling tower. L. pneumophila was recovered from two samples of water from the tower. Infection appeared to have occurred both outside and within the hospital. A significant association was demonstrated between acquisition of Legionnaires' disease and prior hospitalization in those areas of Hospital A that received ventilating air from air intakes near the auxiliary cooling tower. Tracer-smoke studies indicated that contaminated aerosols from the tower could easily reach these air intakes, as well as the street below, where four passers-by had been before they contracted Legionnaires' disease. This represents a common-source outbreak in which the source of L. pneumophila infection and airborne transmission were identified.

Adult↗