Steven A. Frank Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92697–2525 USA The theory of natural selection has two forms. Deductive theory describes how populations change over time. One starts with an initial population and some rules for change. From those assumptions, one calculates the future state of the population. Deductive theory predicts how pop...

* The spectra were obtained both from Dr. Marjorie C. Caserio of the California Institute of Technology, Pasadena, and independently from Dr. LeRoy F. Johnson of Varian Associates, Palo Alto. This assistance is gratefully acknowledged. 1 Noelting, E., and A. Kohn, Chem.-Ztg., 18, 1905 (1894). 2 For various pertinent references, see J. V. R. Kaufman and J. P. Picard, Chem. Rev., 59, 429 (1959). ...

A 48-year-old myopic patient with bilateral anterior chamber depth of 3.1 mm and endothelial cell density (ECD) of 2525 cells/mm(2) and 2638 cells/mm(2) preoperatively had bilateral implantation of an Artisan iris-fixated phakic intraocular lens (pIOL). Five years postoperatively, unilateral corneal stromal edema was seen in a circumscribed area overlying the temporal ridge of the pIOL in the r...

The sensitivities to cefuroxime and cephradine of potentially pathogenic bacteria isolated in two British general hospitals comprising 900 beds have been assessed. In a three-month period 2537 strains were studied; 30 microgram cefuroxime discs were used with 2511 strains, and cephradine discs of the same strength were used with 2525 strains. The organisms were also examined routinely for sensi...

We report on the rapid X-ray variability of the variable star and X-ray transient V4641 Sagittarii (SAX J1819.3-2525 = XTE J1819-254) as observed on 1999 September 15 by the proportional counter array (PCA) on board the Rossi X-Ray Timing Explorer. During the first approximately 900 s of the first PCA observation, V4641 Sgr showed very strong X-ray fluctuations by a factor of 4 on timescales of...

We have developed a feedback controller for a treadmill, in a virtual environment, using a rear projection screen, that keeps the visual extents consistent across subjects and allows them to set their own walking pace naturally. (A) Please consider this paper for poster presentation (B) This paper is intended for Applications Sessions. (C) The first author is not a student. Authors: Lee Lichten...

Forecasting volatility has received a great deal of research attention. Many articles have considered the relative performance of econometric model based and option implied volatility forecasts. While many studies have found that implied volatility is the preferred approach, a number of issues remain unresolved. One issue being the relative merit of combination forecasts. By utilising recent ec...

Based on the fan-beam reconstruction formula recently developed by Noo et al. [Phys. Med. Biol. 47, 2525-2546 (2002)] we develop a Feldkamp-type algorithm for the reconstruction of a volume of interest (VOI) from super-short-scan data. With either a circular or spiral scanning locus in our VOI reconstruction scheme, we first estimate fan-beam data from cone-beam data using the popular "cosine c...