We describe a gradient of potential HIV transmission from HIV-infected persons to their partners and thence to uninfected populations. The effect of this newly discovered transmission gradient is to ...

The challenges of connecting molecular changes to tissue structure and highlights the potential of multifractal frameworks to quantify complex biological patterns ...

Patterns that guide the development of feathers and other features can be set by mechanical forces in the embryo, not just by gradients of chemicals. One of the longest-standing questions in biology ...

AIDS and Behavior. 2007;11(6):789-811. HIV risk behaviors are social behaviors. They usually involve voluntary, cooperative choices that depend on the motivations, attitudes, and emotions of two ...