Science News Archive - April 23, 2009
President Obama said Wednesday that climate change presents a solemn challenge for the world, and that Americans can have a significant impact on the problem by making small changes in their everyday lives.
In the latter half of the 20th century, the lush vegetation of Chinaâ€™s forests and grasslands was absorbing roughly one third of the country's greenhouse gas emissions - but now it appears that rate is declining rapidly.
Several bacterial pathogens use toxins to manipulate human host cells, ultimately disturbing cellular signal transduction.
The National Weather Service there shares a building â€“ the National Space Science and Technology Center â€“ with NASA's Short-term Prediction Research and Transition, or SPoRT, Center. SPoRT puts state-of-the-art NASA satellite data directly into forecasters hands, arming them to recognize weather that threatens your safety.
Plants absorbed carbon dioxide more efficiently under the polluted skies of recent decades than they would have done in a cleaner atmosphere, according to new findings published this week in Nature.
Los Alamos National Laboratory researchers have discovered a potential chink in the armor of fibers that make the cell walls of certain inedible plant materials so tough. The insight ultimately could lead to a cost-effective and energy-efficient strategy for turning biomass into alternative fuels.
Officials with the National Science Foundation formally expressed their gratitude to the multi-nation team that rescued a staff member who had been missing from Wednesday evening to Saturday morning from the foundation's research station at Summit, Greenland.
Will problems associated with environmental issues improve in the next two decades? According to an analysis of student performance on PISA 2006--an international assessment of 15-year-olds--students who are the best informed about environmental science and the geosciences are also the most realistic about the environmental challenges facing the world in the next 20 years.
A U.S. biotechnology company says it will conduct the first clinical trial involving humans of a malaria vaccine that contains the whole malaria parasite. Sanaria Inc. of Rockville, Md., said it is using a weakened form of the whole malaria parasite that's been harvested from irradiated mosquitoes.
The U.S. Food and Drug Administration says the Stop & Shop Supermarket Co.
- The prevailing range of a vocal or instrumental part, within which most of the tones lie.