Tuesday, July 29, 2014

Psychedelic cells are fruit of Alan Turing's equations

29 July 2014 by Jacob Aron
Magazine issue 2979. Subscribe and save
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(Image: Jonathan McCabe)

WE ALL know the world can look weird and wonderful under the microscope, but who knew cells could look this pretty? Actually, you won't find these psychedelic blobs in any living creature on Earth, because contrary to appearances this image has been created by a computer.

Generative artist Jonathan McCabe works with algorithms first developed by mathematician Alan

Turing to create pictures like this. "I don't guide the production of any particular image, the program runs from start to finish without input," McCabe says, though he does tweak the software to produce different results. "The trick is to try to make a system that generates interesting output by itself."

Turing is most famous for his pioneering work in computing Movie Camera

, but he was also interested in how living creatures produce biological patterns such as a tiger's stripes. He came up with a system of equations that describe how two chemicals react together, resulting in surprisingly lifelike arrangements.

McCabe developed his algorithm based on Turing's ideas. His program treats colours as different liquids that can't mix together because of an artificial surface tension, which is what gives them a cell-like appearance. "You get structures which look like cell membranes and mitochondria because at the microscopic scale surface tension forces are strong," says McCabe.

This article appeared in print under the headline "Rise of the blobs"

Cagey material acts as alcohol factory

2 hours ago by Kate Greene

Some chemical conversions are harder than others. Refining natural gas into an easy-to-transport, easy-to-store liquid alcohol has so far been a logistic and economic challenge. But now, a new material, designed and patented by researchers at Lawrence Berkeley National Laboratory (Berkeley Lab), is making this process a little easier. The research, published earlier this year in Nature Chemistry, could pave the way for the adoption of cheaper, cleaner-burning fuels.

"Hydrocarbons like ethane and methane could be used as fuel, but they're hard to store and transport because they're gases," says Dianne Xiao, graduate student at the University of California Berkeley.
"But if you have a catalyst that can selectively turn them into alcohols, which are much easier to transfer and store," she says, "that would make things a lot easier."
Xiao and Jeffrey Long, scientist in Berkeley Lab's Materials Sciences Division and professor of chemistry at the UC Berkeley, focused this project on converting ethane to ethanol.
Ethanol is a potential alternative fuel that burns cleaner and has a higher energy density than other alternative fuels like methanol. One problem with ethanol, however, is that current methods for production require extreme heat, which makes it expensive.

The innovation came when Long and Xiao designed a material called Fe-MOF-74, in a class of materials called metal-organic frameworks or MOFs. Because of their cage-shaped structures, MOFs boast a high surface area, which mean they can absorb extremely large amounts of gas or liquid compared to the weight of the MOF itself.

Since MOFs are essentially structured like a collection of tiny cages, they can capture other molecules, acting as a filter. Additionally, they can perform chemistry as molecules pass through the cages, becoming little chemical factories that convert one substance to another.
It's this chemical-conversion feature of MOFs that Long and Xiao took advantage of. Ethane is a molecule made of two carbon atoms where each atom is surrounded by atoms of hydrogen. Ethanol is also made of two carbon atoms bonded to hydrogen atoms, but one of its carbon atoms is also bonded to a hydrogen-oxygen ion called a hydroxyl.

Previous attempts to add a hydroxyl ion to ethane to make ethanol have required high pressure and high temperatures that range from 200 to 300 degrees Celsius. It's costly and inconvenient.
But by using a specially designed MOF—one in which a kind of iron was added inside the tiny molecular cages—the researchers were able to reduce the need for extreme heat, converting ethane to alcohol at just 75 degrees Celsius.

"This is getting toward a holy grail in chemistry which is to be able to cleanly take alkanes to alcohols without a lot of energy," says Long. Long and Xiao worked closely with researchers at the National Institute of Standards and Technology, the University of Minnesota, the University of Delaware, and the University of Turin to design, model, and characterize the MOF and resultant ethanol production.

Next steps involve tweaking the concentrations of iron in the MOF to produce a more efficient conversion, says Xiao. "It's a promising proof of principle," she says. "It's exciting that we can do this now at low temperature and low pressures."

Explore further: Metal-organic framework helps convert one chemical to another

More information: "Oxidation of ethane to ethanol by N2O in a metal–organic framework with coordinatively unsaturated iron(II) sites." Dianne J. Xiao, et al. Nature Chemistry 6, 590–595 (2014) DOI: 10.1038/nchem.1956. Received 17 December 2013 Accepted 14 April 2014 Published online 18 May 2014
Journal reference: Nature Chemistry

Direct reaction heavy atoms to catalyst surface demonstrated

1 hour ago

The experiment. — Ruthenium crystal covered with oxygen atoms in the experimental set-up Harpoen. Credit: Fundamental Research on Matter (FOM)

Researchers from FOM Institute DIFFER are the first to have demonstrated that heavier atoms in a material surface can react directly with a surrounding gas. The so-called Eley-Rideal reaction has never previously been demonstrated for atoms heavier than hydrogen. The Eley-Rideal process requires less energy than a reaction between two atoms that are both attached to the material. The discovery could lead to more efficient catalysts for the production of synthetic fuel, for example. The researchers published the results on 29 July online in Physical Review Letters.

Most chemical reactions on a material surface (catalyst) follow the Langmuir-Hinshelwood scheme: atoms from the surroundings adhere to the material and move randomly across the surface until they meet each other. At that spot the atoms react with each other and are subsequently released from the surface. In Eley-Rideal reactions a particle on the surface instead reacts directly with an atom from the surroundings that is rapidly moving past it. According to the theory, this type of reaction takes place most easily with light, rapidly moving atoms. In practice, the Eley-Rideal reaction has only been demonstrated with the lightest atom, hydrogen. The team from DIFFER, the Materials innovation institute M2i and the Van 't Hoff Institute for Molecular Sciences in Amsterdam have now demonstrated for the first time that heavier atoms such as nitrogen and oxygen can also undergo an Eley-Rideal reaction.

Reactions between atoms on surfaces. — The direct Eley-Rideal reaction between the surrounding gas and an atom that is attached to the surface had never previously been observed for heavier atoms. Credit: Fundamental Research on Matter (FOM)

Rebound

"In our set-up, Harpoen, we can directly observe the difference between the two types of reaction", explains research leader Dr Teodor Zaharia. His team covered a surface of ruthenium with a layer of oxygen atoms and fired a focused beam of nitrogen atoms at this to obtain the reaction product nitrogen oxide. "The Eley-Rideal reaction takes place within a fraction of a second: the original kinetic energy of the nitrogen is conserved and you can therefore observe the reaction product rebounding from the surface at the same angle as which the original nitrogen atom collided with it." In the Langmuir-Hinshelwood reaction, however, there is no link between the direction of movement of the original atoms and the reaction products; due to the random walk across the surface the information about the original direction of movement is lost. Using detectors that can measure the direction of the reaction product, Zaharia and his team could unequivocally observe the fingerprint of the Eley-Rideal reaction.

The higher energy of the reaction products also revealed that an Eley-Rideal reaction had taken place: just one of the reacting atoms needs to break its attachment to the surface as a result of which less energy is needed. The Eley-Rideal reaction between heavier atoms is therefore attractive for applications in catalysis. The reaction pathway offers extra control over which particles react and that could lead to new ways of producing and processing materials. The research will be continued in a collaboration between DIFFER and the Center of Interface Dynamic for Sustainability that fellow researcher and former director of DIFFER Aart Kleyn has set up in the Chinese city of Chengdu.

Explore further: Scientists discover channel used by catalyst to produce ammonia, vital for food and fuel crops

More information: 'Eley-Rideal reactions with N atoms at Ru(0001): Formation of NO and N₂^'T. Zaharia, A. Kleijn, M. Gleeson, Physical Review Letters, 21 July 2014.
Read more at: http://phys.org/news/2014-07-reaction-heavy-atoms-catalyst-surface.html#jCp

Ali A. Rizvi Become a fan Pakistani-Canadian writer, physician and musician

7 Things to Consider Before Choosing Sides in the Middle East Conflict

Posted: 07/28/2014 2:07 pm EDT Updated: 07/28/2014 2:59 pm EDT

Are you "pro-Israel" or "pro-Palestine"? It isn't even noon yet as I write this, and I've already been accused of being both.

These terms intrigue me because they directly speak to the doggedly tribal nature of the Israeli-Palestinian conflict. You don't hear of too many other countries being universally spoken of this way. Why these two? Both Israelis and Palestinians are complex, with diverse histories and cultures, and two incredibly similar (if divisive) religions. To come down completely on the side of one or the other doesn't seem rational to me.

It is telling that most Muslims around the world support Palestinians, and most Jews support Israel. This, of course, is natural -- but it's also problematic. It means that this is not about who's right or wrong as much as which tribe or nation you are loyal to. It means that Palestinian supporters would be just as ardently pro-Israel if they were born in Israeli or Jewish families, and vice versa. It means that the principles that guide most people's view of this conflict are largely accidents of birth -- that however we intellectualize and analyze the components of the Middle East mess, it remains, at its core, a tribal conflict.

By definition, tribal conflicts thrive and survive when people take sides. Choosing sides in these kinds of conflicts fuels them further and deepens the polarization. And worst of all, you get blood on your hands.

So before picking a side in this latest Israeli-Palestine conflict, consider these 7 questions:

***
1. Why is everything so much worse when there are Jews involved?

Over 700 people have died in Gaza as of this writing. Muslims have woken up around the world. But is it really because of the numbers?

Bashar al-Assad has killed over 180,000 Syrians, mostly Muslim, in two years -- more than the number killed in Palestine in two decades. Thousands of Muslims in Iraq and Syria have been killed by ISIS in the last two months. Tens of thousands have been killed by the Taliban. Half a million black Muslims were killed by Arab Muslims in Sudan. The list goes on.

But Gaza makes Muslims around the world, both Sunni and Shia, speak up in a way they never do otherwise. Up-to-date death counts and horrific pictures of the mangled corpses of Gazan children flood their social media timelines every day. If it was just about the numbers, wouldn't the other conflicts take precedence? What is it about then?

If I were Assad or ISIS right now, I'd be thanking God I'm not Jewish.

Amazingly, many of the graphic images of dead children attributed to Israeli bombardment that are circulating online are from Syria, based on a BBC report. Many of the pictures you're seeing are of children killed by Assad, who is supported by Iran, which also funds Hezbollah and Hamas. What could be more exploitative of dead children than attributing the pictures of innocents killed by your own supporters to your enemy simply because you weren't paying enough attention when your own were killing your own?

This doesn't, by any means, excuse the recklessness, negligence, and sometimes outright cruelty of Israeli forces. But it clearly points to the likelihood that the Muslim world's opposition to Israel isn't just about the number of dead.

Here is a question for those who grew up in the Middle East and other Muslim-majority countries like I did: if Israel withdrew from the occupied territories tomorrow, all in one go -- and went back to the 1967 borders -- and gave the Palestinians East Jerusalem -- do you honestly think Hamas wouldn't find something else to pick a fight about? Do you honestly think that this has absolutely nothing to do with the fact that they are Jews? Do you recall what you watched and heard on public TV growing up in Palestine, Saudi Arabia, Egypt?

Yes, there's an unfair and illegal occupation there, and yes, it's a human rights disaster. But it is also true that much of the other side is deeply driven by anti-Semitism. Anyone who has lived in the Arab/Muslim world for more than a few years knows that. It isn't always a clean, one-or-the-other blame split in these situations like your Chomskys and Greenwalds would have you believe. It's both.

***
2. Why does everyone keep saying this is not a religious conflict?

There are three pervasive myths that are widely circulated about the "roots" of the Middle East conflict:
Myth 1: Judaism has nothing to do with Zionism.
Myth 2: Islam has nothing to do with Jihadism or anti-Semitism.
Myth 3: This conflict has nothing to do with religion.
To the "I oppose Zionism, not Judaism!" crowd, is it mere coincidence that this passage from the Old Testament (emphasis added) describes so accurately what's happening today?

"I will establish your borders from the Red Sea to the Mediterranean Sea, and from the desert to the Euphrates River. I will give into your hands the people who live in the land, and you will drive them out before you. Do not make a covenant with them or with their gods." - Exodus 23:31-32

Or this one?

"See, I have given you this land. Go in and take possession of the land the Lord swore he would give to your fathers -- to Abraham, Isaac and Jacob -- and to their descendants after them." - Deuteronomy 1:8

There's more: Genesis 15:18-21, and Numbers 34 for more detail on the borders. Zionism is not the "politicization" or "distortion" of Judaism. It is the revival of it.
And to the "This is not about Islam, it's about politics!" crowd, is this verse from the Quran (emphasis added) meaningless?

"O you who have believed, do not take the Jews and the Christians as allies. They are [in fact] allies of one another. And whoever is an ally to them among you--then indeed, he is [one] of them. Indeed, Allah guides not the wrongdoing people." - Quran, 5:51

What about the numerous verses and hadith quoted in Hamas' charter? And the famous hadith of the Gharqad tree explicitly commanding Muslims to kill Jews?
Please tell me -- in light of these passages written centuries and millennia before the creation of Israel or the occupation -- how can anyone conclude that religion isn't at the root of this, or at least a key driving factor? You may roll your eyes at these verses, but they are taken very seriously by many of the players in this conflict, on both sides. Shouldn't they be acknowledged and addressed? When is the last time you heard a good rational, secular argument supporting settlement expansion in the West Bank?
Denying religion's role seems to be a way to be able to criticize the politics while remaining apologetically "respectful" of people's beliefs for fear of "offending" them. But is this apologism and "respect" for inhuman ideas worth the deaths of human beings?
People have all kinds of beliefs -- from insisting the Earth is flat to denying the Holocaust. You may respect their right to hold these beliefs, but you're not obligated to respect the beliefs themselves. It's 2014, and religions don't need to be "respected" any more than any other political ideology or philosophical thought system. Human beings have rights. Ideas don't. The oft-cited politics/religion dichotomy in Abrahamic religions is false and misleading. All of the Abrahamic religions are inherently political.
*** 3. Why would Israel deliberately want to kill civilians?
This is the single most important issue that gets everyone riled up, and rightfully so.
Again, there is no justification for innocent Gazans dying. And there's no excuse for Israel's negligence in incidents like the killing of four children on a Gazan beach. But let's back up and think about this for a minute.
Why on Earth would Israel deliberately want to kill civilians?
When civilians die, Israel looks like a monster. It draws the ire of even its closest allies. Horrific images of injured and dead innocents flood the media. Ever-growing anti-Israel protests are held everywhere from Norway to New York. And the relatively low number of Israeli casualties (we'll get to that in a bit) repeatedly draws allegations of a "disproportionate" response. Most importantly, civilian deaths help Hamas immensely.
How can any of this possibly ever be in Israel's interest?
If Israel wanted to kill civilians, it is terrible at it. ISIS killed more civilians in two days (700 plus) than Israel has in two weeks. Imagine if ISIS or Hamas had Israel's weapons, army, air force, US support, and nuclear arsenal. Their enemies would've been annihilated long ago. If Israel truly wanted to destroy Gaza, it could do so within a day, right from the air. Why carry out a more painful, expensive ground incursion that risks the lives of its soldiers?
*** 4. Does Hamas really use its own civilians as human shields?
Ask Palestinian president Mahmoud Abbas how he feels about Hamas' tactics.
"What are you trying to achieve by sending rockets?" he asks. "I don't like trading in Palestinian blood."
It isn't just speculation anymore that Hamas puts its civilians in the line of fire.
Hamas spokesman Sami Abu Zuhri plainly admitted on Gazan national TV that the human shield strategy has proven "very effective."
The UN relief organization UNRWA issued a furious condemnation of Hamas after discovering hidden rockets in not one, but two children's schools in Gaza last week.
Hamas fires thousands of rockets into Israel, rarely killing any civilians or causing any serious damage. It launches them from densely populated areas, including hospitals and schools.
Why launch rockets without causing any real damage to the other side, inviting great damage to your own people, then putting your own civilians in the line of fire when the response comes? Even when the IDF warns civilians to evacuate their homes before a strike, why does Hamas tell them to stay put?
Because Hamas knows its cause is helped when Gazans die. If there is one thing that helps Hamas most -- one thing that gives it any legitimacy -- it is dead civilians. Rockets in schools. Hamas exploits the deaths of its children to gain the world's sympathy. It uses them as a weapon.
You don't have to like what Israel is doing to abhor Hamas. Arguably, Israel and Fatah are morally equivalent. Both have a lot of right on their side. Hamas, on the other hand, doesn't have a shred of it.
*** 5. Why are people asking for Israel to end the "occupation" in Gaza?
Because they have short memories.
In 2005, Israel ended the occupation in Gaza. It pulled out every last Israeli soldier. It dismantled every last settlement. Many Israeli settlers who refused to leave were forcefully evicted from their homes, kicking and screaming.
This was a unilateral move by Israel, part of a disengagement plan intended to reduce friction between Israelis and Palestinians. It wasn't perfect -- Israel was still to control Gaza's borders, coastline, and airspace -- but considering the history of the region, it was a pretty significant first step.
After the evacuation, Israel opened up border crossings to facilitate commerce. The Palestinians were also given 3,000 greenhouses which had already been producing fruit and flowers for export for many years.
But Hamas chose not to invest in schools, trade, or infrastructure. Instead, it built an extensive network of tunnels to house thousands upon thousands of rockets and weapons, including newer, sophisticated ones from Iran and Syria. All the greenhouses were destroyed.
Hamas did not build any bomb shelters for its people. It did, however, build a few for its leaders to hide out in during airstrikes. Civilians are not given access to these shelters for precisely the same reason Hamas tells them to stay home when the bombs come.
Gaza was given a great opportunity in 2005 that Hamas squandered by transforming it into an anti-Israel weapons store instead of a thriving Palestinian state that, with time, may have served as a model for the future of the West Bank as well. If Fatah needed yet another reason to abhor Hamas, here it was.
*** 6. Why are there so many more casualties in Gaza than in Israel?
The reason fewer Israeli civilians die is not because there are fewer rockets raining down on them. It's because they are better protected by their government.
When Hamas' missiles head towards Israel, sirens go off, the Iron Dome goes into effect, and civilians are rushed into bomb shelters. When Israeli missiles head towards Gaza, Hamas tells civilians to stay in their homes and face them.
While Israel's government urges its civilians to get away from rockets targeted at them, Gaza's government urges its civilians to get in front of missiles not targeted at them.
The popular explanation for this is that Hamas is poor and lacks the resources to protect its people like Israel does. The real reason, however, seems to have more to do with disordered priorities than deficient resources (see #5). This is about will, not ability. All those rockets, missiles, and tunnels aren't cheap to build or acquire. But they are priorities. And it's not like Palestinians don't have a handful of oil-rich neighbors to help them the way Israel has the US.
The problem is, if civilian casualties in Gaza drop, Hamas loses the only weapon it has in its incredibly effective PR war. It is in Israel's national interest to protect its civilians and minimize the deaths of those in Gaza. It is in Hamas' interest to do exactly the opposite on both fronts.
*** 7. If Hamas is so bad, why isn't everyone pro-Israel in this conflict?
Because Israel's flaws, while smaller in number, are massive in impact.
Many Israelis seem to have the same tribal mentality that their Palestinian counterparts do. They celebrate the bombing of Gaza the same way many Arabs celebrated 9/11. A UN report recently found that Israeli forces tortured Palestinian children and used them as human shields. They beat up teenagers. They are often reckless with their airstrikes. They have academics who explain how rape may be the only truly effective weapon against their enemy. And many of them callously and publicly revel in the deaths of innocent Palestinian children.
To be fair, these kinds of things do happen on both sides. They are an inevitable consequence of multiple generations raised to hate the other over the course of 65 plus years. To hold Israel up to a higher standard would mean approaching the Palestinians with the racism of lowered expectations.
However, if Israel holds itself to a higher standard like it claims -- it needs to do much more to show it isn't the same as the worst of its neighbors.
Israel is leading itself towards increasing international isolation and national suicide because of two things: 1. The occupation; and 2. Settlement expansion.
Settlement expansion is simply incomprehensible. No one really understands the point of it. Virtually every US administration -- from Nixon to Bush to Obama -- has unequivocally opposed it. There is no justification for it except a Biblical one (see #2), which makes it slightly more difficult to see Israel's motives as purely secular.
The occupation is more complicated. The late Christopher Hitchens was right when he said this about Israel's occupation of Palestinian territories:

"In order for Israel to become part of the alliance against whatever we want to call it, religious barbarism, theocratic, possibly thermonuclear theocratic or nuclear theocratic aggression, it can't, it'll have to dispense with the occupation. It's as simple as that.
It can be, you can think of it as a kind of European style, Western style country if you want, but it can't govern other people against their will. It can't continue to steal their land in the way that it does every day.And it's unbelievably irresponsible of Israelis, knowing the position of the United States and its allies are in around the world, to continue to behave in this unconscionable way. And I'm afraid I know too much about the history of the conflict to think of Israel as just a tiny, little island surrounded by a sea of ravening wolves and so on. I mean, I know quite a lot about how that state was founded, and the amount of violence and dispossession that involved. And I'm a prisoner of that knowledge. I can't un-know it."

As seen with Gaza in 2005, unilateral disengagement is probably easier to talk about than actually carry out. But if it Israel doesn't work harder towards a two-state (maybe three-state, thanks to Hamas) solution, it will eventually have to make that ugly choice between being a Jewish-majority state or a democracy.
It's still too early to call Israel an apartheid state, but when John Kerry said Israel could end up as one in the future, he wasn't completely off the mark. It's simple math. There are only a limited number of ways a bi-national Jewish state with a non-Jewish majority population can retain its Jewish identity. And none of them are pretty.
*** Let's face it, the land belongs to both of them now. Israel was carved out of Palestine for Jews with help from the British in the late 1940s just like my own birthplace of Pakistan was carved out of India for Muslims around the same time. The process was painful, and displaced millions in both instances. But it's been almost 70 years. There are now at least two or three generations of Israelis who were born and raised in this land, to whom it really is a home, and who are often held accountable and made to pay for for historical atrocities that are no fault of their own. They are programmed to oppose "the other" just as Palestinian children are. At its very core, this is a tribal religious conflict that will never be resolved unless people stop choosing sides.
So you really don't have to choose between being "pro-Israel" or "pro-Palestine." If you support secularism, democracy, and a two-state solution -- and you oppose Hamas, settlement expansion, and the occupation -- you can be both.
If they keep asking you to pick a side after all of that, tell them you're going with hummus.

Follow Ali A. Rizvi on Twitter: www.twitter.com/aliamjadrizvi

SPACE & EARTH

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Cassini Spacecraft Reveals 101 Geysers & more on Icy Saturn Moon
Enceladus' geyser-active fractures | July 28, 2014: This artist's rendering shows a cross-section of the ice shell immediately beneath one of Enceladus' geyser-active fractures, illustrating the physical and thermal structure and the processes ongoing below and at the surface.

Scientists using mission data from NASA’s Cassini spacecraft have identified 101 distinct geysers erupting on Saturn’s icy moon Enceladus. Their analysis suggests it is possible for liquid water to reach from the moon’s underground sea all the way to its surface.
These findings, and clues to what powers the geyser eruptions, are presented in two articles published in the current online edition of the Astronomical Journal.

Over a period of almost seven years, Cassini’s cameras surveyed the south polar terrain of the small moon, a unique geological basin renowned for its four prominent "tiger stripe” fractures and the geysers of tiny icy particles and water vapor first sighted there nearly 10 years ago. The result of the survey is a map of 101 geysers, each erupting from one of the tiger stripe fractures, and the discovery that individual geysers are coincident with small hot spots. These relationships pointed the way to the geysers’ origin.

After the first sighting of the geysers in 2005, scientists suspected repeated flexing of Enceladus by Saturn’s tides as the moon orbits the planet had something to do with their behavior. One suggestion included the back-and-forth rubbing of opposing walls of the fractures generating frictional heat that turned ice into geyser-forming vapor and liquid.

Alternate views held that the opening and closing of the fractures allowed water vapor from below to reach the surface. Before this new study, it was not clear which process was the dominating influence. Nor was it certain whether excess heat emitted by Enceladus was everywhere correlated with geyser activity.

To determine the surface locations of the geysers, researchers employed the same process of triangulation used historically to survey geological features on Earth, such as mountains. When the researchers compared the geysers’ locations with low-resolution maps of thermal emission, it became apparent the greatest geyser activity coincided with the greatest thermal radiation. Comparisons between the geysers and tidal stresses revealed similar connections. However, these correlations alone were insufficient to answer the question, “What produces what?”

The answer to this mystery came from comparison of the survey results with high-resolution data collected in 2010 by Cassini’s heat-sensing instruments. Individual geysers were found to coincide with small-scale hot spots, only a few dozen feet (or tens of meters) across, which were too small to be produced by frictional heating, but the right size to be the result of condensation of vapor on the near-surface walls of the fractures. This immediately implicated the hot spots as the signature of the geysering process.

“Once we had these results in hand we knew right away heat was not causing the geysers, but vice versa,” said Carolyn Porco, leader of the Cassini imaging team from the Space Science Institute in Boulder, Colorado, and lead author of the first paper. “It also told us the geysers are not a near-surface phenomenon, but have much deeper roots.”

Thanks to recent analysis of Cassini gravity data, the researchers concluded the only plausible source of the material forming the geysers is the sea now known to exist beneath the ice shell. They also found that narrow pathways through the ice shell can remain open from the sea all the way to the surface, if filled with liquid water.

In the companion paper, the authors report the brightness of the plume formed by all the geysers, as seen with Cassini’s high resolution cameras, changes periodically as Enceladus orbits Saturn. Armed with the conclusion the opening and closing of the fractures modulates the venting, the authors compared the observations with the expected venting schedule due to tides.

They found the simplest model of tidal flexing provides a good match for the brightness variations Cassini observes, but it does not predict the time when the plume begins to brighten. Some other important effect is present and the authors considered several in the course of their work.

The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory (JPL) in Pasadena, California, manages the mission for NASA's Science Mission Directorate in Washington. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging team consists of scientists from the United States, England, France and Germany. The imaging team is based at the Space Science Institute.

Credit: NASA/JPL

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Friday Focus: How Texas’ new solar institute is planning to take on the world

Texas A&M's Center for Solar Energy is setting out to become the world's largest solar research centre.
CSE is aiming to help the US become a world leader in solar.

Blogger

Lucy Woods

Following Obama’s climate action plan the US has begun flag-staking for solar, pumping investment and changing policies to put solar energy at the top: and America at the top of solar.
As the US jumps full bound into dominating solar and international solar companies look for a slice of the action, a flurry of recent announcements suggests the country is also looking to take a lead in the sphere of solar research and academia.

Earlier this month, Texas A&M University revealed grand plans for what it said would be the “world’s largest” solar research institute in the form of the US$600 million Center for Solar Energy (CSE). And hot on its heels, State University New York (SUNY) said it was planning to open a US$100 million new PV manufacturing and development research centre in New York this year.
CSE’s ambitions as the answer to the US solar industry’s problems are indeed impressive. Its promotional video unleashes a barrage of catastrophic facts: the US controlling just 7% of the world solar market when in 1995 it controlled 50%; 90% of solar products coming from outside the US; 2,000 jobs lost; the world spending 500 times more on solar than the US. Will the US be left behind, it asks, or will it regain its “rightful place through innovation and leadership?”
Urgent and inspiring quotes from prominent economists and business leaders make the message clear: America must win the international solar leadership battle, as “the country that can answer the [solar] call will be the force to be reckoned with”.The CSE video questions: “Will we rise to the occasion?” CSE “can and will answer that call,” comes the response.

In short, CSE is shooting for nothing short of being the school for solar, offering the biggest and best of everything: the largest pure solar PV research facility in the world; the only utility-scale test site in the world; the largest exclusively solar PV innovation lab globally; the most technologies deployed anywhere. Alongside all of this, CSE pledges to generate 100% of the campus’ energy from its own 50MW plant.

The US$600 million venture is being majority funded by “venture philanthropy” and government bursaries; it has already secured its first venture partner, but is far from fully funded. CSE subsequently welcomes conversations with technologies corporate groups, other institutions, and venture capitalists and of course philanthropists.

Money aside, CSE’s primary focus will be on education, then job creation with career training, engineering research specialities including cell architecture, optics, ion implantation, 3D printing and advanced manufacturing methods among others.

But with an impressive list of international solar institutes already established across the globe, will CSE ever be able to live up to its grand ambitions?
Mark Thirsk, managing partner at Linx Consulting for electric materials, believes CSE will still find it hard to overtake other established centres such as America’s National Renewable Energy Laboratory, or Germany’s Fraunhofer Institute to become a global leaders.

But he commends CSE’s focus on next-generation research technologies and predicts CSE may “help tip solar installations into becoming sure-fire money makers eventually, but those gains remain a few years away”.

And what about the cost? Fraunhofer’s expenditure over four years was less than half, at approximately US$270 million, while NREL’s expenditure in 2009 was US$316 million.
“The headline number is impressive, but it sounds as if some of the money will be invested in a ground-based array rather than in research,” concludes Thirsk.

Raju Yenamandra, vice president of business development at manufacturer SolarWorld USA, reckons only 25% of the US$600 million figure will be spent on the in-house array, but admits the “devil is in the detail” as announcements so far are not detailed enough for a full insight. Yenamandra doesn’t imagine CSE will be frivolous with its budget though, as it won’t want to be “pounced” on by critics if seen to be splashing money around.

Yenamandra mainly sings CSE’s praise for bringing practical solar to academia, offering a side-by-side comparison for installation approaches. And he predicts that if the institute can make enough money from its 50MW solar plant, it will be able to fulfil its ambitions. CSE plans to sell spare electricity from the plant to the national grid to provide Texans outside the campus walls with clean, green, cheap energy.

For America as a whole Yenamandra thinks CSE will help promote and advertise solar to the general public, as the “population is more likely to embrace solar if it is from a university”. CSE plans to provide independent verifications and breakdowns of solar products to make it clear what has been proven and what is viable in solar energy.

But what seems to define Texas A&M from other universities is its sheer boldness, says Yenamandra. Where other universities he believes are shy and purely technology and theory focused, CSE will be actively applying and installing (and gaining grants and credibility on the way).
Which is good news for graduates – Yenamandra confirms Solarworld USA would value CSE graduates as having an “edge” over others for practical work experience in the solar field, and would hope training times could therefore be minimised, accelerating solar advancement as a whole.
CSE will also run a solar entrepreneurship programme lasting two years aimed at amateurs and established solar professionals. Students are promised the chance to work with cutting edge technology teams and to learn how to start and run a global solar company.

There are also ten scholarships offered per company, with participants given the chance to live in CSE, refine their technology, train in solar business, acquire additional talent and hit the ground at a full run ready for an advanced venture capital investment - leaving the inventors and entrepreneurs in charge of their company, and the technology.

As for CSE’s ambition of America becoming a world leader in solar again, Yenamandra doesn’t think CSE will help it to overtake China in terms of solar production.
But with such bold ambitions, it is hard not to be won over by CSE’s vision of becoming the biggest and best solar research institute in the world.

At least for now anyway.

U.S. Geological Survey (USGS)

Shared publicly - 6:57 AM

Marked Prairie Dog — The chin of an anesthetized prairie dog in Wind Cave National Park, South Dakota is marked before the animal is released back into the wild.

Over 30 organizations and agencies are testing a USGS-developed oral vaccine to prevent the spread of plague in prairie dogs. If successful, the sylvatic plague vaccine could help protect endangered black-footed ferrets in the western U.S. because the ferrets rely on prairie dogs for food.

A veterinarian tags each trapped prairie dog and takes hair, whisker, and blood samples before scientists release the animals. Chin markings help scientists determine whether certain trapped prairie dogs had been previously tested. If markings are present on a trapped animal, that animal is immediately released without further testing. Photo credit: Marisa Lubeck, USGS.

U.S. Geological Survey (USGS)'s photos

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