Source: http://www.revelstoketimesreview.com/lifestyles/180210561.html
oceans 11 ferris state hockey mary poppins john derbyshire kinkade thomas kinkade paintings easter bunny
posted by knepperhorn @ 6:36 PM
0 Comments
ScienceDaily (Nov. 26, 2012) ? An international team of biologists led by Indiana University's David M. Kehoe has identified both the enzyme and molecular mechanism critical for controlling a chameleon-like process that allows one of the world's most abundant ocean phytoplankton, once known as blue-green algae, to maximize light harvesting for photosynthesis.
Responsible for contributing about 20 percent of the total oxygen production on the planet, the cyanobacteria Synechococcus uses its own unique form of a sophisticated response called chromatic acclimation to fine tune the absorption properties of its photosynthetic antenna complexes to the predominant ambient light color. The researchers identified and characterized an enzyme, MpeZ, that plays a pivotal role in the mechanism that allows two different water-soluble proteins in Synechococcus -- phycoerythrin I and II -- to alter their pigmentation in order to maximize photon capture for photosynthesis.
Scientists want to understand how cyanobacteria optimize their photosynthetic activities in different light conditions to gain a better appreciation of how human activities affect the phytoplankton's ability to produce oxygen and uptake the greenhouse gas carbon dioxide, which they consume in order to grow. Science and industry also use the pigment-protein complex phycoerythrin for fluorescent imaging and as fluorescent markers in biotechnology and health care applications.
"We now have the ability to attach a novel chromophore, part of a molecule responsible for its color, to phycoerythrin, which provides a new chromophore-protein combination that absorbs and fluoresces at a wavelength that is not currently commercially available," said Kehoe, a professor in the IU Bloomington College of Arts and Sciences' Department of Biology. "Our results suggest that this new chromoprotein is brighter and more stable than most on the market today."
Kehoe also noted IU has begun the process of filing a patent on the invention. The team found that the gene encoding the MpeZ enzyme is activated in blue light. Once produced, MpeZ then binds to antenna proteins containing pigments that normally catch green light and attaches an alternative chromophore that allows the antennae to capture blue light. The specific mechanism, called type IV chromatic acclimation, involves replacing three molecules of the green light-absorbing chromophore with an equal number of blue light-absorbing chromophore. This color-shifting is reversible and is controlled by the ratio of blue to green light in the environment.
"These 'chromatic adapters' are true chameleons that can efficiently live in green coastal waters as well as in blue offshore waters by modifying their pigmentation," Kehoe said. "Synechococcus cells maintained in blue light harvest preferentially blue light, while cells grown in green light harvest more green."
Funding for this work came from the Agence Nationale Recherches in France, the European program MicroB3, IU's Office of International Programs, the National Science Foundation and the Lilly Foundation.
Share this story on Facebook, Twitter, and Google:
Other social bookmarking and sharing tools:
Story Source:
The above story is reprinted from materials provided by Indiana University.
Note: Materials may be edited for content and length. For further information, please contact the source cited above.
Journal Reference:
Note: If no author is given, the source is cited instead.
Disclaimer: Views expressed in this article do not necessarily reflect those of ScienceDaily or its staff.
Source: http://feeds.sciencedaily.com/~r/sciencedaily/top_news/~3/dec8irt_q_w/121126163957.htm
golden girls robert e lee golden globe winners the express zappos hacked jane fonda jon huntsman
posted by knepperhorn @ 8:22 PM
0 Comments
LAKE LOUISE, Alberta (AP) ? Aksel Lund Svindal of Norway won a super-G Sunday, completing a sweep at Lake Louise.
Svindal also won Saturday's downhill, making him the first man to win both events at Lake Louise since Bode Miller in 2004.
Svindal was timed in 1 minute, 34.96 seconds, beating runner-up Adrien Theaux of France by 0.85 seconds. Joachim Puchner of Austria was third in 1:35.86, and Ted Ligety of the U.S. was fourth in 1:35.87.
Source: http://news.yahoo.com/norways-svindal-wins-super-g-completes-sweep-221016480--spt.html
posted by knepperhorn @ 1:50 AM
0 Comments
The Australian government, through Defence Minister Stephen Smith, has apologised to the country?s military personnel, who have been sexually mistreated or otherwise maltreated, during their military service.
The Defence Minister expressed an apology in Parliament on behalf of the government, subsequent to hundreds of claims of sexual abuse and rape from the members of the Australian military, historical and present.
An inquest into the Australian military sex abuse allegations has been initiated by the government. A compensation fund has also been established by the government to assist the victims of military sex abuse. The Australian military sex abuse allegations stretch across 60 years and are being viewed as a stain on the Australian military reputation.
The Defence Minister has asserted that young male and female Australian soldiers have undergone sexual, physical and mental mistreatment from their military colleagues. This behaviour was unjustifiable and wasn?t in sync with the principles of a broadminded and diverse Australian society.
In the last two years, the Australian government, headed by Labour PM Julia Gillard, has commenced and continued a process to reform the Australian military culture. Attempts have been initiated by the Australian government to make the military more accepting of female soldiers.
Defence Minister Stephen Smith has accepted claims that military officers misused their positions of trust through sexually abusive behaviour. Some military officers refused to take action against their colleagues, who were perpetrating abusive behaviour.
Stephen Smith proclaimed that retired judge, Len Roberts-Smith, has been appointed as the head of the inquiry into the Australia military sex abuse allegations. More than 1000 complaints of military sexual abuse had been received by the government, with the earliest ones dating back to the 1950s.
The Defence Minister cautioned that some sexual abuse perpetrators could still be in the Australian military.
Australian Defence Force (ADF) Chief Lieutenant, General David Hurley, has vowed to cooperate with the inquiry into the Australian military sex abuse allegations. Hurley has uttered that the perpetrators of abuse in the military have failed to comprehend that military rank is a privilege and not a license for violent or arrogant behaviour.
Related articles:
South Pacific Sandy Island is ghost island, say Australian scientists
Australia to make world?s largest marine parks
No Schapelle Corby deal with Indonesia, says Australia
Source: http://www.globalnewsdesk.co.uk/rest-of-the-world/australia-military-sex-abuse-allegations/02587/
born free walking dead finale nascar bristol narwhal st louis university mario manningham mario manningham
posted by knepperhorn @ 2:34 PM
0 Comments
Subscribe to
Posts [Atom]