Book Reviews

Book 1Book Title: Getting into Residency: A Guide for Medical StudentsBook Author: Kenneth V. IsersonPp. xviii + 431. $28,95. Tucson: Galen Press. 1993. ISBN 1-883620-10-4.Book 2Book Title: Molecular Biology of Digestive DiseaseBook Author: Ed. by Philip QuirkePp. vii + 116. £15. London: BMJ. 1994. ISBN 0-7279-0827-8.Book 3Book Title: Parkinson's DiseaseBook Author:  Ed. by Merton Sandler.Pp. ix + 65. £12/US$24. London: John Libbey, 1993. ISBN 0-86196-404-7.Book 4Book Title: Brain Work and Mental Activity: Quantitative Studies With Radioactive TracersBook Author: Ed. by N. A. Lassen, D. A. Ingvar, M. A. Raichle & L. FribergPP. 446. Illustrated. Copenhagen: Munksgaard. 1991. ISBN 87-16-10698-9.Book 5Book Title: Guidelines for Quality Assurance Programmes for Blood Transfusion ServicesBook Author: WHOPp. IV + 50. (Available in English; French and Spanish in preparation). SFr.12/US$10,80 (in developing countries SFr.8,40). Geneva: WHO. 1993. ISBN 92-4-154448-1. Order No. 1150392.Book 6Book Title: ABC of AlcoholBook Author: Ed. by Alex PatonPp. ix + 32. illustrated. £10. London: BMJ. 1994. ISBN 0-7279-D812-X.Book 7Book Title: Atlas of Surgical Exposures ofthe Lower ExtremityBook Author: A. Masquelet, C. McCullough, R Tubiana, I. Fyfe, L. Klenerman, E. LetoumelPp. 414. Illustrated. London: Manin Dunitz. 1993. ISBN 1-85317-D03-8

O adsorption and incipient oxidation of the Mg(0001) surface

First principles density functional calculations are used to study the early oxidation stages of the Mg(0001) surface for oxygen coverages 1/16 <= Theta <= 3 monolayers. It is found that at very low coverages O is incorporated below the topmost Mg layer in tetrahedral sites. At higher oxygen-load the binding in on-surface sites is increased but at one monolayer coverage the on-surface binding is still about 60 meV weaker than for subsurface sites. The subsurface octahedral sites are found to be unfavorable compared to subsurface tetrahedral sites and to on-surface sites. At higher coverages oxygen adsorbs both under the surface and up. Our calculations predict island formation and clustering of incorporated and adsorbed oxygen in agreement with previous calculations. The calculated configurations are compared with the angle-scanned x-ray photoelectron diffraction experiment to determine the geometrical structure of the oxidized Mg(0001) surface.Comment: 10 pages, 5 figure

The Impact of Perceived Expectations and Uncertainty on Firm Investment

This paper analyses the (differential) impact of perceived expectations and uncertainty on investment spending in small and large firms. We analyse two types of investment, viz. aggregate investment and investment in energy-saving technologies, using Dutch firm level data. The results show that expectations and uncertainty about input- and output prices and domestic demand have substantial but different effects on investment spending in firms of different sizes. Furthermore, we find evidence, at least for small firms, that there are important differences between the effects of uncertainty about input and output variable