When will a plus act like a minus?
Charge-Reversal Instability in Mixed Bilayer Vesicles. With Chen. Phys. Rev. E62 (2000) 2608.

[picture] How can spheres self-assemble into platelets?
Surfactant-mediated two-dimensional crystallization of colloidal crystals. With Ramos, Lubensky, Dan, Weitz. Science 286 (1999) 2325

How can oppositely-charged objects repel?
Electrostatic Repulsion of Positively Charged Vesicles and Negatively Charged Objects. With Aranda-Espinoza, Chen, Dan, Lubensky, Ramos, Weitz. Science 285 (1999) 394

How can the activity of one gene activate another gene?
Transport of Torsional Stress in DNA PNAS 96 (1999) 14342. (gzipped .ps)

What can you learn by pulling on a mile-long rope in a hurricane?
Entropic Elasticity of Twist-Storing Polymers. With Moroz. (Revised version.) Macromolecules 31 (1998) 6333 (gzipped .ps) [see Physics News Update]

How does the information content of DNA show up in its mechanical properties?
Sequence-Disorder Effects on DNA Entropic Elasticity Phys. Rev. Lett. 80 (1998) 5810.

What happens when you tweak biomembranes using the world's smallest, most delicate tweezers?
Dynamic Excitations in Membranes Induced by Optical Tweezers. With Bar-Ziv and Moses. (Biophys. J. 75 (1998) 294-320) (write me for a hard copy).

[picture] What do you do when you need a nanoscale torque wrench?
Torsional Directed Walks, Entropic Elasticity, and DNA Twist Stiffness. With Moroz. PNAS 94 (1997) 14418.
Conference talks: Joint DIMACS/PMMB/MBBC Workshop on DNA Topology, Rutgers University (3--4 April 1997) (Biophys. J., 74 (1998) 2501); Condensed Matter Gordon Conference, July 1997.

How can entropy make things more ordered?
Hard Spheres in Vesicles: Curvature-Induced Forces and Particle-Induced Curvature. With Dinsmore, Wong, and Yodh. Phys. Rev. Lett. 80 (1998) 409(compressed .ps only)

[picture] How can you detect the helical structure of DNA from its mechanical properties?
Direct Determination of DNA Twist-Stretch Coupling. With Kamien, Lubensky, and O'Hern. Europhys. Lett 38 (1997) 237. (compressed version)

Why would a large hole in a biomembrane stay open a long time, then snap shut suddenly?
Dynamically-Stabilized Pores in Bilayer Membranes . With Moroz. Biophys. J. 72 (1997) 2211.

[picture] How can a laser induce controlled membrane topology change (see the movie)?
Spontaneous expulsion of giant lipid vesicles induced by laser tweezers. With Bar-Ziv, Moroz, and Moses. Phys. Rev. Lett. 78 (1997) 386. (compressed version) [see Physics News Update]

What happens when you pull a tangled thread in honey?
Straightening of Thermal Fluctuations in Semi-Flexible Polymers by Applied Tension. With Seifert and Wintz. Phys. Rev. Lett. 77 (1996) 5389. (compressed version)

[picture] If membrane elasticity is really scale-invariant, then what could set the cell size of giant cubic phases?
The Role of Bilayer Tilt Difference in Equilibrium Membrane Shapes. With Seifert and Shillcock. Phys. Rev. Lett. 77 (1996) 5237. (compressed version)

How do you turn a blob of fat into a string of pearls (see the movie)? pearling graphic[picture]
Front Propagation in the Pearling Instability of Tubular Vesicles. With Goldstein, Powers, Seifert. J. Phys. II (Paris) 6 (1996) 767. (compressed version)
Dynamic Theory of Pearling Instability in Cylindrical Vesicles. With Powers and Seifert. Phys. Rev. Lett. 74 (1995) 3384. (compressed version)

Why do helical membrane structures disappear right at the chain-melting transition?
Fluctuating membranes with tilt order. With Powers. J. Phys. II (Paris) 5 (1995) 1671. (compressed version)