The divergence of new genes and proteins occurs through mutations that modulate protein function. The effects of these mutations are pleiotropic, thus imposing trade-offs between selection pressures ...

Nearly 150 years after Darwin published On the Origin of Species, biologists are still debating how new species emerge from old--and even the definition of species itself. Darwin demurred from ...

This is a preview. Log in through your library . Abstract The currently available methods of finding the zeros of a vector function are quite effective but they do require a prior knowledge of the ...

The prevention of bleeding with adequately sustained levels of clotting factor, after a single therapeutic intervention and without the need for further medical intervention, represents an important ...

Biologists at the University of California, San Diego have demonstrated, in a study of the songs and genetics of a series of interbreeding populations of warblers in central Asia, how one species can ...