Integration of IS1301 into an AT-rich inverted repeat located upstream of the ltx operon was previously shown to confer a hyperleukotoxic phenotype in Actinobacillus actinomycetemcomitans IS1 (T. He, T. Nishihara, D. R. Demuth, and I. Ishikawa, J. Periodontol. 70:1261-1268, 1999), but the mechanism leading to increased leukotoxin production was not determined. We show that an IS1 ltx promoter::...

We present an analysis of an optical blue spectrum of the pulsating helium star V652 Her (=BD+13◦3224) in order to determine its effective temperature, surface gravity and chemical composition. By fitting synthetic spectra to the observations we find that for our spectrum Teff = 24 550 ± 500 K, log g = 3.68 ± 0.05 (cgs) and vt = 5 ± 5 km s−1. The surface gravity, together with a previous measur...

Labor market institutions, via their effect on the wage structure, affect the investment decisions of firms in labor markets with frictions. This observation helps explain rising wage inequality in the US, but a relatively stable wage structure in Europe in the 1980s. These different trends are the result of different investment decisions by firms for the jobs typically held by less skilled wor...

This editorial refers to ‘Cardiovascular molecular imaging: an overview’ by A. Saraste et al., pp. 643– 652, this issue; ‘Ultrasound molecular imaging of atherosclerosis’ by B.A. Kaufmann, pp. 617–625, this issue; ‘Contrast ultrasound molecular imaging of inflammation in cardiovascular disease’ by J.R. Lindner, forthcoming; ‘Molecular imaging using contrast-enhanced ultrasound: evaluation of an...

Mohammad Mehdi Rashidi 1,2, Muhammad Mubashir Bhatti 3, Munawwar Ali Abbas 4 and Mohamed El-Sayed Ali 5,* 1 Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal Management Systems, Tongji University, Shanghai 201804, China; [email protected] 2 ENN-Tongji Clean Energy Institute of Advanced Studies, Tongji University, Shanghai 200072, China 3 Shanghai Institute of Applied Mathematics a...

A purification procedure for the Group C phage-associated lysin is described utilizing tetrathionate to protect the enzyme's -SH group(s) from thiol-inactivating agents. A 652-fold purification has been accomplished yielding a solution in which the enzyme activity corresponds to essentially a single band on polyacrylamide gel which accounts for 70% of the total protein in the preparation. A mol...

OVERVIEW............................................................................................ 650 INTRODUCTION TO FLA VIVIRUS BIOLOGy.............................................. 650 Classification and Life Cycle in Nature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 650 Importance as Disease Agents . . . . . . . . . . . . ....