childhood hepatitis b virus (hbv) infection causes both medical and public health challenges. infants who acquire hbv parentally have up to 90% risk of developing chronic hbv infection. it is now estimated that approximately 10% of worldwide cancers are attributable to viral infection, with the vast majority (>85 %) occurring in the developing world. in this distribution, elevated rate and prev...

Habitat heterogeneity is often suggested as being important for the stability of populations, and promoted as a means to aid the conservation of species, but the evidence for such an assumption is poor. Here we show that heterogeneous landscapes that contain a variety of suitable habitat types are associated with more stable population dynamics for 35 British butterfly species from 166 sites. I...