Tom Pollard: upwardly motile

Tom Pollard: upwardly motile

Tom Pollard is the new president of the prestigious Salk Institute for Biological Studies in La Jolla, California. Until recently, it seemed unlikely that Pollard, who has spent his research career studying how cells move, would make a move himself. He seemed settled at Johns Hopkins University School of Medicine, where he has been for the past nineteen years. But Pollard says it was time for a...

Upwardly mobile proteins

High Mobility Group proteins (HMGs) are a set of chromatin proteins first identified in the 1970s because they are very abundant and run fast on SDS–PAGE. In these and other properties they resemble histones. And like histones, which have seen a resurgence of interest thanks to the discovery that their modification modulates transcription, HMGs are staging a comeback. They now appear to be impo...

Tom.

Tom George

Tom George lias an odd kind of picture gallery. All the houses in his street have lean-to pantries, with tiny windows, the upper half glass, the lower latticed wood. It is traditional to keep the family egg-cups on the ledge formed by the wooden bottom of the glass section. Every variety of egg-cup is here displayed?white, red, and blue china, and metal. Occasionally other small, gay articles a...

Non-degeneracy of Pollard Rho Collisions

The Pollard ρ algorithm is a widely used algorithm for solving discrete logarithms on general cyclic groups, including elliptic curves. Recently the first nontrivial runtime estimates were provided for it, culminating in a sharp O( √ n) bound for the collision time on a cyclic group of order n [4]. In this paper we show that for n satisfying a mild arithmetic condition, the collisions guarantee...