Reopening Old Divisions

Embryonic divisions

The British prime minister, Gordon Brown, may have been hoping for a quiet Easter break but he soon got warning in the press of an issue that would scupper any such thoughts. The government is backing a bill that will put into law many of the practices currently licensed case by case by the Human Fertilization and Embryology Authority. Britain is currently one of the nations at the forefront of...

Obama taps new allies and tackles age-old divisions in nudging health care reform.

Per-Pixel Divisions

We describe a method to perform per pixel divisions using graph ics hardware with a simple iterative algorithm In the worst case the number of rendering passes is for approximate divisions and for accurate divisions The algorithm can be used for D vec tor normalization evaluating complex lighting models and image reconstruction Introduction and Previous Work Graphics hardware can act as a power...

On Noncommutative Involutive Divisions

Buchberger’s algorithm for computing a Gröbner basis solves the ideal membership problem over commutative polynomial rings. In the early 1990’s, an alternative to this algorithm was found, namely the involutive basis algorithm, which provides a Gröbner basis with extra combinatorial properties. Buchberger’s work was generalised to noncommutative polynomial rings by Bergman and Mora during the 1...

Number of Nuclear Divisions

The cell number of the early Drosophila embryo is determined by exactly 13 rounds of synchronous nuclear divisions, allowing cellularization and formation of the embryonic epithelium [1]. The pause in G2 in cycle 14 is controlled by multiple pathways, such as activation of DNA repair checkpoint, progression through S phase, and inhibitory phosphorylation of Cdk1, involving the genes grapes, mei...