Pops Gets the Polycomb

The International POPs Elimination Project

Vertex Pops and Popturns

This paper considers transformations of a planar polygon P according to two types of operations. A vertex pop (or a pop) reflects a vertex vi, i ∈ {1, . . . , n}, across the line through the two adjacent vertices vi−1 and vi+1 (where index arithmetic is modulo n). A popturn rotates vi in the plane by 180◦ about the midpoint of the line segment vi−1vi+1. Pops and popturns are polygon reconfigura...

Fate of POPs

Impact of the regional climate and substance properties on the fate and atmospheric long-range transport of persistent organic pollutants – examples of DDT and γ-HCH V. S. Semeena, J. Feichter, and G. Lammel Max Planck Institute for Meteorology, Centre for Marine and Atmospheric Sciences (ZMAW), Hamburg, Germany Meteorological Institute, University of Hamburg, Centre for Marine and Atmospheric ...

The Spindle Gets Bigger

Although cortical nonmuscle myosin II has long been implicated in cytokinetic aspects of cell division, there has never been strong evidence that it plays a role in the organization of the mitotic spindle. ([this issue of Cell]) use a number of methods to show that cortical myosin II is in fact important for spindle assembly in higher eukaryotic cells, specifically for the complete separation o...

GRASP65 gets the chop

astillo et al. (page 453) have identified what may be a key event in building the spindle pole body (SPB) of budding yeast. They found that the kinase Mps1p phosphorylates and thus helps organize Spc42p, an important component of the SPB central plaque. Mps1p has been a difficult protein to study, as it does double duty as a regulator of SPB structure, and as part of the spindle checkpoint sign...