We report for the first time on the rapid X-ray variability of the galactic bulge source and X-ray burster SLX 1735–269. The power spectrum as observed with the Rossi Xray Timing Explorer is characterized by a strong band-limited noise component which is approximately flat below a 0.1–2.3 Hz break frequency; above this frequency the power spectrum declines as a power law of index 0.9. At the hi...

Residues Asp-90 and Arg-269 of Escherichia coli aspartate transcarbamylase seem to interact at the interface of adjacent catalytic subunits. Alanine substitutions at the analogous positions in the hamster aspartate transcarbamylase of a chimaeric protein carrying an E. coli maltose-binding domain lead to changes in both the kinetics of the enzyme and the quaternary structure of the protein. The...

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Type 1 ryanodine receptor (RyR1) releases Ca2+ ions from the sarcoplasmic reticulum of skeletal muscle to initiate contraction. Multiple endogenous and exogenous effectors activate RyR1. Cryo-electron microscopy has identified binding sites three co-activators Ca2+, ATP caffeine, however, mechanism co-regulation synergy between these activators remains be determined. Here, we tested hypothesis ...

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In a high-crime environment with many high-income citizens, private security companies which off er protection against crime can fl ourish. In this article crime is modelled as a game where richer victims yield a higher return on crime, but with decreasing returns to crime as more criminals choose crime to supplement their income. Private security providers off er protection against crime and f...