Source: www.ibtimes.com --- Monday, July 15, 2013
An Indian young man, presumably bitter for not being able to carry on his rape plans against the girl object of his desire, had set her on fire instead with kerosene over the weekend. But apparently, there is more than meets the eye to the tragic incident. ...
Source: http://www.ibtimes.comhttp:0//www.ibtimes.co.in/articles/490170/20130715/rape-kerosene-india.htm
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NEW YORK (AP) ? Demonstrators from across the country are protesting a jury's decision to clear George Zimmerman in the 2012 shooting death of an unarmed black teenager while the Justice Department considers whether to file criminal civil rights charges.
Rallies on Sunday attracted anywhere from a few dozen people to more than a thousand as demonstrators voiced their support for 17-year-old Trayvon Martin's family ? and decried Zimmerman's not guilty verdict as a miscarriage of justice.
The NAACP and protesters are calling for federal civil rights charges against Zimmerman, a neighborhood watch volunteer who was acquitted Saturday in Martin's death.
The Justice Department says it is looking into the case to determine whether federal prosecutors should file criminal civil rights charges now that Zimmerman has been acquitted in the state case.
Source: http://news.yahoo.com/rallies-marches-zimmerman-verdict-064105495.html
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Public release date: 15-Jul-2013
Share ] Contact: Denise Brehm
brehm@MIT.EDU
617-253-8069
Massachusetts Institute of Technology
CAMBRIDGE, MA -- Tiny ocean plants, or phytoplankton, were long thought to be passive drifters in the sea unable to defy even the weakest currents, or travel by their own volition. In recent decades, research has shown that many species of these unicellular microorganisms can swim, and do so to optimize light exposure, avoid predators or move closer to others of their kind.
Now scientists at MIT and Oxford University have shown that the motility of phytoplankton also helps them determine their fate in ocean turbulence. Rather than acting to distribute them evenly as physics would demand of small particles mixed into a fluid the individual vortices that make up ocean turbulence are like social mixers for phytoplankton, bringing similar cells into close proximity, potentially enhancing sexual reproduction and other ecologically desirable activities.
In a paper appearing online July 15 in Nature Communications, William Durham of Oxford, Roman Stocker of MIT and co-authors describe how at the scale of millimeters, phytoplankton caught in a watery vortex form highly concentrated patches at the center of the swirl. In the turbulent ocean where short-lived vortices form continually, this process repeats itself, carrying the microorganisms from social mixer to social mixer.
The findings are counterintuitive because turbulence is the most expedient means of mixing two substances (imagine stirring milk into coffee). If they were unable to swim, microorganisms exposed to a sea of vortices would form a homogenous distribution in the water. Instead, the study shows that the turbulence causes the phytoplankton to form concentrated patches.
'Turbulent un-mixing'
"Based on our intuition of turbulence and turbulent mixing, we expected homogeneity to reign," says Stocker, an associate professor of civil and environmental engineering who led the study. "Instead, the phytoplankton surprised us by forming highly concentrated clusters of cells it's turbulent un-mixing. For the phytoplankton, this is a vehicle to effectively find cells of the same species without any sensory information on each other's location or the need to invest in costly means of chemical communication."
But patchiness can also have a downside: Phytoplankton, the photosynthetic microbes of the sea, form the base of the ocean food web. Clusters of cells can become easy prey to zooplankton predators that home in on clusters of phytoplankton. And close proximity to like cells can increase competition among the microorganisms for sparse nutrients.
"While patchiness increases the chance of a fatal encounter with a predator, it also increases the chance of finding other phytoplankton cells, which is needed to form resilient cysts that can survive harsh winter conditions," says Durham, the paper's first author and a lecturer at Oxford University who began working on this study as a doctoral student at MIT. "This mechanism suggests phytoplankton might tune their motility to have the best of both worlds, minimizing patchiness when there are a lot of predators around while maximizing patchiness when the time is ripe for cyst formation."
The research team which includes MIT graduate student Michael Barry, Eric Climent of the University of Toulouse, Filippo De Lillo and Guido Boffetta of the University of Torino and Massimo Cencini of the National Research Center of Italy first performed experiments using phytoplankton in the lab, then extended their observations to a turbulent ocean with high-resolution simulations performed on a supercomputer.
Possible evolutionary adaptation
For the experiments, a transparent box shaped like the letter H formed a simplified version of the ocean, with seawater flowing upward through the vertical bars, creating two inner-directed vortices within the horizontal bar. When the researchers added Heterosigma akashiwo (a motile, red-tide-forming species known for its ability to kill fish), the microorganisms formed dense patches at the centers of the swirls. To single out the role of motility, the researchers repeated the experiment with dead microorganisms, which the turbulence distributed uniformly.
The computer simulation mimicked ocean turbulence on a larger scale, with more than 3 million phytoplankton and many interacting vortices forming at the smallest possible scale of turbulence. It found that patchiness increased more than tenfold when the phytoplankton swam. And as their speed increased, so did the patchiness, leading to the conjecture that over evolutionary timescales, the microorganisms might possibly have developed the ability to actively adjust their swimming speed to modulate interactions with others of the same species and with predators.
"Life is turbulent in the vast expanses of the ocean and it's fascinating to learn how some of the most important organisms on our planet fare and behave in their daily turbulent lives," Stocker adds.
###
The work was funded by the Human Frontier Science Program, the National Science Foundation and the MIT MISTI-France Program.
Written by Denise Brehm, MIT News Office
[ | E-mail | Share ] ?
AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.
Public release date: 15-Jul-2013 Share ] Contact: Denise Brehm
brehm@MIT.EDU
617-253-8069
Massachusetts Institute of Technology
CAMBRIDGE, MA -- Tiny ocean plants, or phytoplankton, were long thought to be passive drifters in the sea unable to defy even the weakest currents, or travel by their own volition. In recent decades, research has shown that many species of these unicellular microorganisms can swim, and do so to optimize light exposure, avoid predators or move closer to others of their kind.
Now scientists at MIT and Oxford University have shown that the motility of phytoplankton also helps them determine their fate in ocean turbulence. Rather than acting to distribute them evenly as physics would demand of small particles mixed into a fluid the individual vortices that make up ocean turbulence are like social mixers for phytoplankton, bringing similar cells into close proximity, potentially enhancing sexual reproduction and other ecologically desirable activities.
In a paper appearing online July 15 in Nature Communications, William Durham of Oxford, Roman Stocker of MIT and co-authors describe how at the scale of millimeters, phytoplankton caught in a watery vortex form highly concentrated patches at the center of the swirl. In the turbulent ocean where short-lived vortices form continually, this process repeats itself, carrying the microorganisms from social mixer to social mixer.
The findings are counterintuitive because turbulence is the most expedient means of mixing two substances (imagine stirring milk into coffee). If they were unable to swim, microorganisms exposed to a sea of vortices would form a homogenous distribution in the water. Instead, the study shows that the turbulence causes the phytoplankton to form concentrated patches.
'Turbulent un-mixing'
"Based on our intuition of turbulence and turbulent mixing, we expected homogeneity to reign," says Stocker, an associate professor of civil and environmental engineering who led the study. "Instead, the phytoplankton surprised us by forming highly concentrated clusters of cells it's turbulent un-mixing. For the phytoplankton, this is a vehicle to effectively find cells of the same species without any sensory information on each other's location or the need to invest in costly means of chemical communication."
But patchiness can also have a downside: Phytoplankton, the photosynthetic microbes of the sea, form the base of the ocean food web. Clusters of cells can become easy prey to zooplankton predators that home in on clusters of phytoplankton. And close proximity to like cells can increase competition among the microorganisms for sparse nutrients.
"While patchiness increases the chance of a fatal encounter with a predator, it also increases the chance of finding other phytoplankton cells, which is needed to form resilient cysts that can survive harsh winter conditions," says Durham, the paper's first author and a lecturer at Oxford University who began working on this study as a doctoral student at MIT. "This mechanism suggests phytoplankton might tune their motility to have the best of both worlds, minimizing patchiness when there are a lot of predators around while maximizing patchiness when the time is ripe for cyst formation."
The research team which includes MIT graduate student Michael Barry, Eric Climent of the University of Toulouse, Filippo De Lillo and Guido Boffetta of the University of Torino and Massimo Cencini of the National Research Center of Italy first performed experiments using phytoplankton in the lab, then extended their observations to a turbulent ocean with high-resolution simulations performed on a supercomputer.
Possible evolutionary adaptation
For the experiments, a transparent box shaped like the letter H formed a simplified version of the ocean, with seawater flowing upward through the vertical bars, creating two inner-directed vortices within the horizontal bar. When the researchers added Heterosigma akashiwo (a motile, red-tide-forming species known for its ability to kill fish), the microorganisms formed dense patches at the centers of the swirls. To single out the role of motility, the researchers repeated the experiment with dead microorganisms, which the turbulence distributed uniformly.
The computer simulation mimicked ocean turbulence on a larger scale, with more than 3 million phytoplankton and many interacting vortices forming at the smallest possible scale of turbulence. It found that patchiness increased more than tenfold when the phytoplankton swam. And as their speed increased, so did the patchiness, leading to the conjecture that over evolutionary timescales, the microorganisms might possibly have developed the ability to actively adjust their swimming speed to modulate interactions with others of the same species and with predators.
"Life is turbulent in the vast expanses of the ocean and it's fascinating to learn how some of the most important organisms on our planet fare and behave in their daily turbulent lives," Stocker adds.
###
The work was funded by the Human Frontier Science Program, the National Science Foundation and the MIT MISTI-France Program.
Written by Denise Brehm, MIT News Office
[ | E-mail | Share ] ?
AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.
Source: http://www.eurekalert.org/pub_releases/2013-07/miot-psm071113.php
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Source: http://www.wallstreetoasis.com/blog/how-ivies-brainwash-hs-students-into-college-zombies
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ANCHORAGE, Alaska |
ANCHORAGE, Alaska (Reuters) - Critics of an oil-industry tax cut handed a petition with 50,000 signatures to Alaska state officials on Saturday, more than enough to force a referendum that would overturn a new oil tax law.
The bill, approved by the legislature three months ago, replaces taxes tracking oil prices with a cap on tax at 35 percent of net profits. Expectations for the new system were for a likely tax range from about 14 percent to about 20 percent.
"This bill that they passed is against the interests of Alaska," Vic Fischer, a former state senator and one of two surviving authors of the Alaska constitution, told a group of about 50 banner-waving tax-cut opponents gathered outside government offices in Anchorage.
Referendum supporters, organized in a group called "Vote Yes - Repeal the Giveaway", needed 30,169 signatures of registered voters - 10 percent of the total turnout in the last statewide election - to qualify their measure for the 2014 ballot.
Leading oil producers in Alaska include BP Plc, ConocoPhillips and Exxon Mobil Corp.
Governor Sean Parnell, sponsor of the new tax, argued that steep cuts in oil taxes were needed to lure industry investment away from North Dakota and other booming oil-producing areas. He dubbed the bill the "More Alaska Production Act".
Opponents say the tax cuts are too steep, will cost the state $4.5 billion in lost revenues over five years, and do nothing to reverse North Slope production declines that they say are inevitable as the area's main oil fields age.
(Reporting by Yereth Rosen; Additional reporting by Braden Reddall in San Francisco; Editing by Louise Ireland)
Source: http://feeds.reuters.com/~r/Reuters/domesticNews/~3/YNbiF1bQ8fo/story01.htm
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