Biomedical subjects

P Dickerson

Publications and source records attributed to P Dickerson.

3 recordsLinked to original sources

PubMed2001

Evaluation of mechanical and corrosion biocompatibility of TiTa alloys.

As-received and heat-treated Ti40Ta and Ti50Ta alloys were evaluated to determine their corrosion as well as mechanical performances and compared to Ti6A14V, a common material utilized for orthopedic (surgical) implants. Anodic potentiodynamic tests performed in Plasmalyte showed that all samples, except for the Ti50Ta specimen aged at 400 degrees C for 3 h gave a curve similar to that of Ti6A14V. Optical and TEM microscopy was performed to determine as-received and heat-treated microstructures. As-received materials showed an alpha precipitate in an alpha+beta and martensite matrix. Samples that were aged at 400 degrees C increased in the density and the length of the alpha precipitate. Vickers hardness measurements were performed to get an approximation of the tensile strengths. Aged Ti40Ta and Ti50Ta specimens produced the highest tensile values when compared to the Ti6A14V material, representing a 31% and 56% increase for the 3 h samples and an 18% and 58% increase for the 10 h samples. Of all the materials studied the Ti50Ta specimen aged for 10 h exhibited the best biocompatibility showing excellent corrosion resistance combined with the highest tensile strength (1089 MPa and 58% harder/stronger than Ti6A14V).

Journal Article↗

PubMed2000

'But I'm different to them': constructing contrasts between self and others in talk-in-interaction.

Contrast occurs as an important theme across a range of post-structural, conversation and discourse analytic and 'traditional' social psychological work. Some approaches link contrasts to identity issues--thus self-categorization theory argues that identity arises in part through self assignment to particular categories--which is done on the basis of one's perception of similarities and differences with others. This paper explores contrast in identity talk from a different vantage point: one which has the strengths and shortcomings of an emphasis upon talk in interaction rather than on cognition in isolation. In so doing it draws upon a corpus of extracts largely derived from unstructured interviews with television news audiences but supplemented with some published data of relevance to the deployment of contrast with others. The paper illustrates some of the different ways in which contrasts with others can be constructed and deployed, which may challenge a category assignment, construct a generic category of others against whom self is favourably positioned, or act as an interactionally astute self-deprecation. In each case the contrast is understood as tuned in to the interactional issues at hand. In this way contrast is conceptualized as a live talk-in-interaction activity which can be fruitfully explored from the perspective of the participants themselves.

Humans↗

PubMed1999

Traumatic wound care.

The scope and importance of traumatic wound care, assessment, debridement, pre and postoperative management, and subsequent skin care during the course of treatment cannot be over-emphasized, and indeed, are the most important considerations for functional and cosmetic outcome. Care begins in the emergent phase and continues through acute and convalescent phases. Efforts are directed at methods and techniques which prevent infection, facilitate wound healing, promote comfort, and at the same time, maintain optimal function and minimize deformities.

Debridement↗