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Day June 21, 2010

The Sun and Summer Solstice

From National Geographic, photographs courtesy NASA/JPL:

Sun Storm

The sun-orbiting SOHO spacecraft captured this snapshot of the development of a coronal mass ejection (CME), an explosive sun storm. It shows erupting filaments lifting off the active solar surface and blasting enormous bubbles of magnetic plasma into space. CMEs occur anywhere from once a week to two or more times a day, and they can profoundly influence space weather.

Sunspot Loops

It may look wild, but this image of the solar surface, captured by a NASA satellite called TRACE in 2000, was described by scientists as “a quiet day on the sun.” In other words, spectacular loops but no storms.

Coronal Loops

Magnetism made visible: That describes virtually every feature on the sun, from sunspots to these soaring structures, called loops. Loops easily reach the height of ten Earths. Energy generated by the dynamics of smaller loops is likely the source of the solar corona’s mysterious heat. The superheated gases that form the sun, mainly hydrogen and helium, exist in an electrified state called plasma. Below the surface, plasma can push and drag magnetic field lines. But when lines are strong enough to arc out, wildly conductive plasma follows.

Songbirds Learn Their Songs During Sleep

Via ScienceDaily:

When zebra finches learn their songs from their father early in life, their brain is active during sleep.

That is what biologists at Utrecht University conclude in a paper published in the Proceedings of the Royal Society B. Their findings are a further demonstration that birdsong learning is very similar to the way that children learn how to speak.

This discovery has important consequences for our understanding of the brain processes involved in learning and memory. Human infants learning to speak show increased activation in a part of the brain that is comparable to that studied in young zebra finches. Furthermore, language learning in children is improved when they are allowed to take a nap. The Utrecht discovery will increase our understanding of the role of sleep in the formation of memory.

A model for speech learning

Previously the researchers, Sharon Gobes, Thijs Zandbergen and Johan Bolhuis, had demonstrated that the way in which zebra finches learn their songs is very similar to the way in which children learn to speak. In both cases learning takes place during early youth and involves considerable practise. Also, in children and songbirds alike, different brain regions are involved in learning and in speaking or singing. The new research shows that, just as in human infants, the brain of the young zebra finch is also active during sleep. This makes songbirds a good animal model to study the role of sleep in human speech acquisition.

The brain is active during sleep It has been known that sleep plays an important role in learning in humans and other mammals. In songbirds it had been shown previously that during sleep the brain has the same pattern of activity as during singing the day before. The present findings show that the more young songbirds have learned from their father’s song, the more active their brain is during subsequent sleep.

[ In relation ]

True Intuition…

True intuition is not a judgment of grammaticality but an evaluation of internal variables of enunciation in relation to the aggregate of the circumstances.

Gilles Deleuze & Félix Guattari, A Thousand Plateaus, Capitalism and Schizophrenia, 83

House in the Pyrenees

Via Dezeen:

Architects Cadaval & Solà-Morales added this steeply-pitched roof to an old dry stone construction in the Spanish Pyrenees to form two homes.

[ Continue ]

A Transfer to Texas for Oiled Pelicans

Via chron, by Lynn Brezosky:

38 brown pelicans – rescued from the oil spill – gladdened their rescuers as they quickly took to their new home

Tentative wing-flapping led to graceful soaring and convivial preening Sunday as 38 brown pelicans rescued from the worst oil mess in U.S. history explored new digs in the blue-green waters of San Antonio Bay.

“They’re Texas birds right now,” said Dan Alonso, project leader for the Aransas National Wildlife Refuge Complex and host for the largest release to date of birds rehabilitated from the Deepwater Horizon oil spill, the first in Texas.

It had been a long morning for the pelicans, which – along with a single tern – made two long road trips and a two-hour flight in the belly of a U.S. Coast Guard HC-144 transport plane cramped up in dog carriers.

Within minutes of their release, the birds began disappearing into the refuge, encouraging biologists who feared they might be too weak from either ingested oil or the rehabilitation itself to take to new surroundings.

“They’ve got really good chances now,” said Tom Melius, the U.S. Fish & Wildlife biologist overseeing the transfer. “The best thing for these birds is to get them back on their natural water as soon as possible. They know how to catch fish and feed, they know how to make a living for themselves.”

Social by nature

Aransas is already home to brown pelicans, and is one of 10 sites in Texas being considered for relocations of what biologists call the “pelican oil spill.” Pelicans so far dominate the list of birds collected in the past two months in Alabama, Florida and Louisiana, which numbered 665 alive and 212 dead as of late last week.

Pelicans are social by nature, and the oil seeped their way as they gathered to nest. About 200 more pulled from muck in Alabama and Louisiana are reaching the stage where they can be released into the wild, and officials anticipating an eastward spread of the oil are looking west.

“If we just took them out 20 miles from where they were caught, put them back there in the water, they’d go back to where they were caught,” Melius said. “Over here, hopefully they’ll take time to preen, to restore their body conditions through natural feeding – if it doesn’t discourage them from going back, we hope it takes a long time.”

There is debate about whether cleaning oil birds is any more than a “feel-good” measure that only delays the birds’ death. Some studies point to altered breeding activity and harmed embryos.

“There is no way to know what their chances are, exactly,” James Remsen, a bird specialist at Louisiana State University, said in an e-mail prior to the release. “Many marine birds home back to point of origin; whether this happens with brown pelicans is unknown.”

Fish and Wildlife spokeswoman Nancy Brown said all the birds had been banded, which made the release “an opportunity to get some good science.”

‘We’re keeping track’

Should the birds wash up dead, the tags will identify them as oil spill victims and necropsies will be conducted to determine what caused the death.

For now, an array of state and federal agencies plan to coordinate more transfers to Aransas and other sites in Texas – with BP footing the bill. The air transport alone involved two pilots, two Coast Guard personnel and one representative each from the National Park Service, U.S. Geographical Survey and U.S. Fish & Wildlife. “We’re keeping track,” Alonso said. “All the hours, fuel, mileage – we’re keeping an exact account.”

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