The destabilization process of an emulsion under flow is investigated in a microfluidic device. The experimental approach enables us to generate a periodic train of droplet pairs, and thus to isolate and analyze the basic step of the destabilization, namely, the coalescence of two droplets which collide. We demonstrate a counterintuitive phenomenon: coalescence occurs during the separation phas...

Though many Iraqis are unhappy with the presence of US-led forces, most express strong support for various forms of international assistance, including the presence of foreign security forces, UN (rather than US) leadership on reconstruction, an international conference of global and regional players to address Iraq's needs, engagement by the Arab League and a variety of forms of nonmilitary US...

D uring evolution, all vertebrates have been exposed to multiple waves of crossspecies infection by retroviruses. A number of defensive strategies have developed, among them the spontaneous expression, throughout the body, of restriction factors, antiviral proteins that will bind to the capsid (CA) protein of incoming virions and interfere with virus replication (1). One example of such a prote...