Castonguay : Sciences

Saturday, May 23, 2009

Pollution Kills Dhaka's Rivers

Thursday, May 21, 2009

Arctic River Deltas May Hold Clues to Future Global Climate

MacKenzieRiver

Study Finds Surprising New Pathway for North Atlantic Circulation

Le Monde des Eaux Douces

Le monde des eaux douces
Giles Walker, 1976, 24 min 22 s
Court métrage documentant les importants travaux accomplis par l'Institut des eaux douces, à Winnipeg, au Manitoba, dans le but de préserver et de protéger cette richesse incontestable.

Tout en démontrant une grande distance entre la technologie scientifique des années 76, ce film démontre les préoccupations environnementales qui animaient les scientifiques de cette époque.

Wednesday, May 20, 2009

NASA Study Shows Asteroids May Have Accelerated Life on Earth

Coping With Unusual Atomic Collisions Makes an Atomic Clock More Accurate

JILA's strontium optical atomic clock is now the world's most accurate clock based on neutral atoms.

NASA Podcasts : President Obama Calls Hubble Servicing Crew

American Car Emissions : Green Machine

Tuesday, May 19, 2009

Pliable Proteins KeepPhotosynthesis on the Light Pato

Caption: The reactions that convert light to chemical energy happen in a millionth of a millionth of a second, which makes experimental observation extremely challenging. A premier ultrafast laser spectroscopic detection system established at the Biodesign Institute, with the sponsorship of the National Science Foundation, acts like a high-speed motion picture camera. It splits the light spectrum into infinitesimally discrete slivers, allowing the group to capture vast numbers of ultrafast frames from the components of these exceedingly rapid reactions. These frames are then mathematically assembled, allowing the group to make a figurative "movie" of the energy transfer events of photosynthesis.

Credit: Arizona State University Biodesign Institute

Scientists Make First Direct Observations of Biological Particles in High-Altitude Clouds

Biological particles-bacteria, pollen, fungi, act as nuclei for formation of ice in clouds.

Monday, May 18, 2009

How Solid Is Concrete's Carbon Footprint?

Concrete absorbs carbon dioxide over time, so its carbon footprint may be smaller than once thought.

New Element Found to be a Superconductor

Inside of the diamond cell: In the middle is the coil system around the diamond anvil, which picks up the shielding signal from the superconducting sample.