Finding the corridor more traveled

Finding the corridor more traveled.

A s wildlands give way to an expanding human footprint, scientists and land managers have struggled to develop land conservation strategies that protect biodiversity. A favored strategy is to connect large habitat areas with landscape corridors (1–3). Yet, the scientific question remains: Do corridors actually work to promote dispersal and conserve biodiversity? In this issue of PNAS, Gillies a...

On finding a widest empty 1-corner corridor

A 1-corner corridor through a set S of points is an open subset of CH(S) containing no points from S and bounded by a pair of parallel polygonal lines each of which contains two segments. Given a set of n points in the plane, we consider the problem of computing a widest empty 1-corner corridor. We describe an algorithm that solves the problem in O(n4 logn) time and O(n) space. We also present ...

The road less traveled.

The road less traveled

Phagosomes containing the bacterial pathogen Legionella pneumophila are transported to the ER after macrophage internalization. To modulate phagosome transport, Legionella use a specialized secretion system that injects bacterial proteins into eukaryotic cells. This review will focus on recent studies that have identified bacterial proteins and host processes that play a concerted role in trans...

The road less traveled

Traditional approaches for salvaging peri-odontally involved teeth have faced the test of whether or not the treatment modalities can guarantee tooth survival for more than a couple of decades. This challenge stems from the most recent encouraging reports of a success rate of over 15 years of implant therapy to treat partial edentulism. The main criticism of traditional periodontal therapy targ...