Physical Review Letters--April 30, 2001 Contents See

Erratum: Optical Frequency Measurement of the 2S-12D Transitions in Hydrogen and Deuterium: Rydberg Constant and Lamb Shift Determinations See

Reply: Cosmelli See

Comment on "Measurement of the Intrinsic Dissipation of a Macroscopic System in the Quantum Regime" See

Reply: González-Lezana et al. See

Comment on "Efimov States for 4He Trimers?" See

Reply: Wu See

Comment on "Double Diffusive Convection in Freely Suspended Soap Films" See

Population Dynamics See

Bistability in Pulse Propagation in Networks of Excitatory and Inhibitory Populations See

Existence and Stability of Persistent States in Large Neuronal Networks See

Viscoelasticity of Solutions of Motile Polymers See

Exciton Delocalization Probed by Excitation Annihilation in the Light-Harvesting Antenna LH2 See

Dynamic Pattern Formation in a Vesicle-Generating Microfluidic Device See

Entangled Quantum States as Direction Indicators See

Measurement of Persistence in 1D Diffusion See

Spin-Polarized Electrons in Collisions of Multicharged Nitrogen Ions with a Magnetized Fe(001) Surface See

Coherent Control of Optical Emission from a Conjugated Polymer See

Observation of the Transverse Optical Plasmon in SmLa0.8Sr0.2CuO4 delta See