Putting DNA in its place

Putting Hierarchy in Its Place

Putting Opacity in its Place

We clarify the relationships between Guerraoui and Kapalka’s opacity correctness condition for Transactional Memory (TM) algorithms and the TMS1 and TMS2 conditions we have previously proposed. Using formal, machine checked simulation proofs constructed using the PVS theorem proving system, we have shown that all algorithms that satisfy opacity also satisfy TMS1, and that all algorithms that sa...

Putting Liberalism in Its Place

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Putting Plasticity in Its Place

activity corresponding to a series of shuttle runs across a square arena, heteroassociative connections between activated place cells become potentiated, cells with overlapping place fields develop strong bidirectional connections and asymmetric connections between cells against the direction of motion become depressed. The elevated connectivity of the activated ensemble resembles the broad dev...

DNA segregation: Putting chromosomes in their place

Recent studies provide evidence that bacterial chromosomes are replicated by an enzyme factory, the replisome, located at a fixed position at the center of the cell; the fixed replisome could be a major factor in determining chromosome order in the cell, and may provide the force that drives chromosome segregation.