Introduction to the interpretation of chest radiographs during donor care.

Organ procurement coordinators often provide independent interpretations of chest radiographs during donor care. Catheter or tube position, lobar atelectasis, extra-alveolar air, air bronchograms, pleural fluid, and other findings are important throughout donor care and when deciding if a lung is acceptable for transplantation. Technical factors, features of a normal chest radiograph, and abnormal radiographic findings are reviewed and examples are presented.

A physico-chemical explanation of the post-polymerization shrinkage in dental resins.

Unlabelled: The main problem of a methacrylated dental resin's photopolymerization is the shrinkage phenomenon. This occurs, as expected, during light irradiation but also, unexpectedly, during about 24h after photopolymerization (i.e.

Characterization of the inorganic fraction of resin composites.

The purposes of this study were to determine the weight fraction of filler in thirty-nine resin-based materials including flowable and packable composites, and to examine the morphology of the filler particles. The percentages of inorganic fillers by weight were determined by Thermogravimetric Analysis and by ashing in air technique at 900 degrees C. The size and shape of the filler particles were examined using scanning electron microscopy (SEM) after dissolution of the organic matrix.

The reorganization of basic science departments in U.S. medical schools, 1980-1999.

The evolution of biomedical science and technology over the last 50 years has made biomedical research inherently interdisciplinary. Such changes have led observers to speculate about the ways in which traditional basic science departments in U.S.