A video showing the gynecandrous condition of a spike; pistillate flowers distal, staminate flowers proximal. A useful diagnostic character for species determinations within the genus Carex.
The maturation sequence is included to show the progression over time within a gynecandrous spike.
"The Genetic Response to Snowball Earth: Role of HSP90 in the Cambrian Explosion"
Download this paper at the following web address: http://repositories.cdlib.org/postprints/2103
The events that shaped the Cambrian explosion from 545 to 530 Ma, when multicellular animals suddenly appeared in the fossil record, are not fully understood. It is likely that the evolution of new transcription factors and other signal transduction proteins that regulated developmental networks was important...
A discussion with Brian Dear from Eventful.com, Seth Greenberg from Intuit.com and Turbotax, and Seth Sternberg from Meebo.com on Web 2.0, online enterpreneurship, user communities, advertising, technology and communication.
West Nile virus entered the United States in 1999 and is now considered a seasonal epidemic that starts in the summer and continues into the fall. First isolated in Uganda in 1937, the virus can cause severe human meningitis or encephalitis in 1% of those infected. In 2007 the U.S. Centers for Disease Control reported 124 fatalities. The rapid spread of West Nile virus has put local and state mosquito surveillance programs on the front line of public health and disease preparedness.