Playing a molecular accordion

The Laptop Accordion

The“Laptop Accordion”co-opts the commodity laptop computer to craft an expressive, whimsical accordion-like instrument. It utilizes the opening and closing of the laptop screen as a physical metaphor for accordion bellows, and the laptop keyboard as a musical buttonboard. Motion is tracked using the laptop camera via optical flow and mapped to continuous control over dynamics, while the sound i...

Accordion waves in Myxococcus xanthus.

Myxococcus xanthus are Gram-negative bacteria that glide on solid surfaces, periodically reversing their direction of movement. When starved, M. xanthus cells organize their movements into waves of cell density that sweep over the colony surface. These waves are unique: Although they appear to interpenetrate, they actually reflect off one another when they collide, so that each wave crest oscil...

Coronary accordion effect mimicking coronary dissection

The coronary "accordion" effect is a rare pseudo-complication of percutaneous coronary intervention (PCI). It is usually observed due to straightening and shortening of tortuous vessels with stiff guidewires during PCI. In this case report, we present an interesting case of the coronary accordion effect observed in a 52-year-old woman undergoing PCI.

The novelty of the "Accordion Grating Illusion"

Geometric Realizations of the Accordion Complex of a Dissection

Consider 2n points on the unit circle and a reference dissection D◦ of the convex hull of the odd points. The accordion complex of D◦ is the simplicial complex of non-crossing subsets of the diagonals with even endpoints that cross an accordion of the dissection D◦. In particular, this complex is an associahedron when D◦ is a triangulation and a Stokes complex when D◦ is a quadrangulation. In t...