INTRODUCTION Cone beam computed tomography (CBCT) can provide dentists with high-quality 3-dimensional images of dental structures because of its high spatial resolution. The reconstructions of root canal systems given by the Kodak 9000 3D were compared with histologic sections to evaluate the reliability of the reconstructions. METHODS Nine intact freshly extracted teeth with closed apexes w...

The capacity of microsomal membranes to translocate nascent presecretory proteins across their lipid bilayer can be largely abolished by extracting them with high ionic strength buffers. It can be reconstituted by adding the salt extract back to the depleted membranes [Warren, G. & Doberstein, B. (1978) Nature (London) 273, 569-571]. Utilizing hydrophobic chromatography, we purified to homogene...

1. The biosynthesis of glucagon in guinea-pig A(2) cells was investigated by incubation of isolated islets of Langerhans in the presence of [(3)H]tryptophan for periods of up to 14 days. Proteins were extracted from islets and incubation media and analysed by gel filtration. 2. In addition to very-high-molecular-weight (100000) proteins, the principal tryptophan-containing biosynthetic product ...

T study asserted that quality improvement (QI) requires the coexistence of two cultural values of innovation and attention to detail and proposed that their coexistence depends on the implementation of multiple QI practices. A longitudinal QI intervention, with five phases, consisting of multiple QI practices—ISO 9000, QI teams, quality goals, and coaching and communication by top management—wa...

Purpose – This study aims to explore the barriers to implementation of ISO 9000 in China, and to identify how these barriers can be overcome. Design/methodology/approach – Using a structural questionnaire survey, this paper examines the main barriers for enterprises in effective implementation of the ISO 9001 standard. Findings – This paper highlights the problems in implementing the standard, ...

Presents the key findings of a study into quality practices of a number of organisations in one of the Arab countries, Qatar, which is recognised as one of the leading liquefied natural gas-exporting regions since its reserves of gas represent about 7.4 per cent of the world total. The purposes of the study were to assess: the awareness, the understanding, the progress of, and reasons for the i...