Plant organs reproducibly reach a set size and shape, and a key question is what prevents overgrowth. A new study uses imaging and computer modelling of the Arabidopsis sepal to show that mechanics determines growth arrest and thus final organ shape.

The objectives of this study were to evaluate and compare the performance of the deceased donor registries of the 50 states and the District of Columbia and to identify possible predictive factors of donor designation. Data were collected retrospectively by Donate Life America using a questionnaire sent to Donor Designation Collaborative state teams between 2007 and 2010. By the end of 2010, th...

1540 Emerging Infectious Diseases • www.cdc.gov/eid • Vol. 18, No. 9, September 2012 and provides a clear example of how epidemiologic baseline information on virus host range and tropism in animals may provide indications for the presence of similar viruses in the same organ system of humans. To clarify the epidemiology and pathogenicity of picobirnaviruses in humans, additional surveillance s...

[I]f a gift-of-life ethic is preferred and policy makers cannot solve the philosophical dispute over emotion in morality, a dispute that divides proponents of altruism and of routine procurement, then policy makers could judge whether the prevailing model of altruism has received a fair and sufficient test. This judgment would flow from an initial endorsement of altruism as a preferred public p...