The quark masses are fundamental parameters of the QCD lagrangian which are not predicted by the theory. Their definition is not unique since quarks are not observed as free particles, but confined inside hadrons. Therefore, the use of dynamical expressions is mandatory in order to determine the masses of the quarks. The perturbative pole mass, Mq, and the running mass in the MS scheme, mq, are...

Dr Deniz Aslan is a Consultant Psychologist and Lecturer, based at Department of Psychology, Roehampton University, London, UK and Langford Clinic, East Sussex, UK. Robert Edelmann is a Professor of Forensic and Clinical Psychology, Dr Diane Bray is the Head of Department and Dr Marcia Worrell is a Principal Lecturer, all are based at Department of Psychology, Roehampton University, London, UK....

By ROBERT C. BRAY and STEPHEN A. COCKLE School ofMolecular Sciences, University ofSussex, Falmer, Brighton BN1 9QJ, Sussex, U.K. and E. MARTIN FIELDEN and PETER B. ROBERTS Division ofPhysics, Institute of Cancer Research, Clifton Avenue, Sutton, Surrey, U.K. and GIUSEPPE ROTILIO and LILIA CALABRESE Centro di Biological Molecolare del C.N. R., Istituto di Chimica Biologica, Universita di Roma, R...

Doris G. Bartuska, M.D., F.A.C.E. George W. Bray, M.D., M.A.C.E. C. Wayne Callaway, M.D., F.A.C.E. Eugene T. Davidson, M.D., M.A.C.E. Stanley Feld, M.D., M.A.C.E. Robert T. Ferraro, M.D. Stephen F. Hodgson, M.D., F.A.C.E. Paul S. Jellinger, M.D., F.A.C.E. Frank P. Kennedy, M.D. Ann M. Lawrence, M.D., Ph.D., M.A.C.E. Pasquale J. Palumbo, M.D., F.A.C.E. John A. Seibel, M.D., F.A.C.E. Adam F. Spit...

In a Perspective accompanying a study by Benjamin Bray and colleagues, Meeta Kerlin discusses the evidence that physician and nurse workforces are associated with patient mortality, why clearer guidelines for appropriate workforce size are not available, and the next steps needed to address the knowledge gaps. Please see later in the article for the Editors' Summary.

The eXtensible Markup Language (XML) (Bray, et al., 1998) is the emerging standard for data representation and exchange on the World Wide Web. The XML Framework includes very powerful mechanisms for accessing and manipulating XML documents that are likely to significantly impact the development of tools for processing natural language and annotated corpora.

Hepatocytes were isolated from eight species of birds ranging from 13 g zebra finches to 35 kg emus. This represents a 2800-fold range of body mass (Mb). Liver mass (g) was allometrically related to species body mass by the equation: liver mass=19.6 x Mb(0.91). There was a significant allometric decline in hepatocyte respiration rate (HRR; nmol O2 mg(-1) dry mass min(-1)) with species body mass...