The Things Rain Brings

When Graffiti Brings Order

Most researchers use Petri nets as a formal notation with mathematically defined semantics. Their graphical part is usually only seen as a notation, that does not carry semantics. Contrary to this tradition, we show in this article that, when created by a human, there is inherent semantics in the positions of places, transitions and arcs. We propose to use the full definition of Petri nets: whe...

Energy diversity brings stability.

Energy diversity brings stability W hen I pull up to a gas-station pump, I have three choices: regular, premium, or something in between. I make the obvious choice and fill up with the cheapest option (while I wonder who uses those even more expensive fuels). It is the same scenario whether I'm in State College, Pa., or Los Angeles. All across the U.S., we have a transportation infrastructure b...

People challenges? CROWDSOURCING brings solutions

Paxillin brings peace to microtubules

Lipid droplets ensure their own consumption H ungry yeast cells use a clever form of recycling to ensure that they can keep consuming stored lipids, Wang et al. show. Lean times spur yeast cells to enter a quiescent state known as the stationary phase. They break down cached lipids by delivering lipid droplets to the vacuole and resort to autophagy, in which they digest a portion of their own c...

Stress Brings Memories to the Fore

A common feature of post-traumatic stress disorder and various mood and anxiety disorders is the formation of negative associations with neutral stimuli, or the recall of negative memories stimulated by unrelated, neutral circumstances. However, the contribution of stress itself to these phenomena is unclear. Now, Fenton and colleagues have shown that in rats stress can reactivate memories that...