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Book Review: Paleobiology and Animal Behavior

Title: Super Crocs & Monster Wings: Modern Animals’ Ancient Past
Author: Claire Eamer
Publisher: Annick Press

I have read many books about ecology and animal behavior, but this is the first book I have come across that explains the behavior of animals of the past and present. It is children’s book about evolution, paleobiology and systematics. Paleobiology is a discipline related to paleontology but include a comparison of extinct, prehistoric organism to current, living organisms. When scientists come across a fossil, they begin a long, creative process of puzzle-solving, much like the scientists from Waking the Baby Mammoth. They usually compare the animal –its body, its behavior, and its habits – to living relatives and descendants. This trade book introduces readers to the ancient relatives of some of today’s common animals – crocodiles, dragonflies, birds, rodents, camels, armadillos, and of course elephants!
And the book includes many colorful pictures and fun facts to communicate to readers.
In chapter 5 – Size Isn’t Everything: Where Did All of the Giants Go?, the author discusses the possible reasons why the great Woolly Mammoths may have gone extinct. Ideal for students in grades 3-7.

So check out this book and the next airing of Waking the Baby Mammoth, Wednesday, April 29th, 8:00pm.
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The National Geographic Channel Presents Waking the Baby Mammoth

In May 2007, a reindeer herder named Yuri Khudi discovered her. She miraculously re-appeared on a riverbank in northwestern Siberia. She is the most perfectly preserved woolly mammoth ever discovered and her name is Lyuba. A 1-month-old baby mammoth, she walked the tundra about 40,000 years ago and then died mysteriously. This discovery has mesmerized the scientific world - creating headlines across the globe. Everyone wants to know... how did she die? What can she tell us about life during the ice age and the Earth's changing climate? Will scientists be able to extract her DNA, and what secrets will it uncover?

You can follow the journey by watching Waking the Baby Mammoth presented by the National Geographic Channel. The premier show is airing Sunday, April 26, 2009 at 8 pm central standard time.

I had the opportunity to pre-screen the program. What I like best is the inside view into the scientific field of paleontology - the study of pre-historic, often extinct forms of life. The film provides a rare glimpse into how such scientists formulate questions, their methods and high-tech tools and equipment, and how they interpret the results of their find. I study living animals that are abundant and relatively easy to find, so I was curious as to how scientists study a subject that is rare.

As I learned in the film, paleontology is a very collaborative effort. With so many people interested in a single, delicate subject, it is important that they work together. A team of scientists from across the globe worked together to discover the secrets Lyuba, and each of them had their own specialty. They carefully planned their questions and work to harvest tissues, specimens and images of Lyuba – inside and out – all while disturbing her carcass as little as possible.
But this story wouldn’t be possible without the help of non-scientists, citizens like Yuri Khudi and Kirill Seretetto, who called the appropriate authorities so that the mammoth could be studied for science. This film presents a great example as to how the scientific community and general public are partners in the discovery of “human knowledge at large”. Working together they were able to bring an important specimen to the world’s attention and answer those questions about how Lyuba and her kind lived, how she may have died, and how she came to be discovered in such remarkable shape.

Only a handful of mammoths have ever been found before; but none quite like her. Here in the St. Louis, Missouri Metro area, we also have connections to a historic woolly mammoth find. At Principia College, in Elsah, Illinois, the teeth of an ancient mammoth was luckily discovered when the campus was preparing for a new construction project in 1999. Since that time the Department of Geology and scores of students have participated in what might be described as the best class project ever – A Mammoth Dig! You can read about their progress over the semesters here and see pictures of the bones they have unearthed here. The College does participate in science education outreach, hosting several hundred K-12 students each year. Visit the website to get more information.

You can also learn more about the ice age and woolly mammoths in the upcoming issue of National Geographic Magazine or at the interactive website.Come back and check out my other “Mammoth” posts I have in store this week and tell me what you think about the show.
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Happy Arbor Day! Sycamores of St. Louis

This year the last Friday of is today, April 24th, is Arbor Day. Since 1872, J. Sterling Morton has been advocating for planting trees for beauty, fuel, and soil conservation. Today, in our very urban life styles, we still need trees – native trees.

Each state of the United States has a state tree; the official tree of Missouri is the Flowering Dogwood. But I’m curious do cities have a special tree? I don’t think so. But if St. Louis had one it should be the Sycamore. The Sycamore is one of the more visually distinctive trees in the United States. It is a large hardwood tree that grows very tall. It is mottled in color –gray, brown, green, and a very distinctive smooth white bark. They are everywhere in St. Louis – along neighborhood streets and city parks.

Enjoy my pictures of Sycamore trees young and old, seed and tree, across the seasons.


Sycamore tree in summer

Sycamore tree in autumn.





Sycamore tree pods - with seeds inside

Sycamore pod (the seed of a sycamore tree)

that's the tiny seed
surrounded by light fluffy material similar to dandilion fluff.


Fallen leaves of a sycamore

Eyes of a needle.

The flaking, mottled bark of a Sycamore

I'm a Tree Hugger! Happy Arbor Day!
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Beta testers wanted

I've been working on a major addition to this blog (which is why I haven't posted much recently). It's now at the stage where I'd like to have some beta testers. The issues are with the structure and content, as the software itself is solid.

This won't necessarily take much of your time. If you'd like to volunteer, please contact me (via info in my profile). I'd appreciate it if you give me access to your own profile on Blogger or any other social network, so I can learn a little about you.

Thanks.
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Pay it Forward - Supporting Youth in Science and Cultural Studies

Announcement #1: Aquatic Adventures Student a Finalist for the Cox Conserves Heroes Award!

A few years ago I met a very dynamic woman, Shara Fisler, the founder of Aquatic Adventures - an urban science education program for inner city teens. Kindred, I know. We discussed possibilities of me working with her and her program in San Diego. Though my timing has been way off, she and her program are still very much on my radar. (So, Shara, if you're reading this, I'm still hoping to do something with you.)

Now, one of her students, is a finalist for the prestigious Cox Conserves Hero Award for the San Diego area. Sonya is an Aquatic Adventures high school senior who volunteered more than 200 hours to plan and lead the Wetland Avengers habitat restoration event last May. This project mobilized more than 1,000 volunteers to help learn about and protect their neighborhood canyon. Volunteers planted 2,500 native plants, designed an outdoor canyon classroom, and created a school garden at an adjacent elementary school. The event became the largest community-based restoration event in the country. Sonya's leadership made this possible!

If you would be so kind as to join me and voting for her, she will receive up to $5,000 to donate
to Aquatic Adventures if she wins. All it takes is the
click of your mouse to vote.
Voting ends April 26th!


Announcement #2: The People Could Fly Will Travel to Egypt with the African Travel Association

The People Could Fly proudly announces we have been honored to be invited to join a contingent of ambassadors, students, and creative entrepreneurs from around the world to attend the African Travel Association’s 34th Congressional Meeting. May 16 -22, 2009, two of the five nomadic, storytelling and story documenting sisters - Kalimah Abioto and Hanifah Abioto will travel 6,577 miles to Cairo, Egypt! They will explore this rich and ancient culture and return to the States to share their stories in photo and on film.

I know these young ladies. They are my dear cousins. Already at the tender age of 21 they have logged many more miles of travel across the world than I have. I'm simultaneously jealous and proud. They are adventures and cultural explorers who document the day-to-day lives and aspirations of young people here and abroad. They give youth who are often overlooked or dismissed - those from the inner-cities, those who are poor, who are different, who are striving, who are invisible - a microphone and a podium to express to the world they are here and relevant.

Most of their travel costs are being covered by The Young Professional’s Network who has partnered with the African Travel Association to cover registration fees, accommodation, travel, and touring events while in Egypt. However, they need assistance with travel to and from Egypt. Therefore, I am asking that join me in making an investment in this amazing project. Any amount is appreciated.
Their budget:
Airfare: $590* 2 ($ 1180)
Visa: 15*2 ($30)
Emergency Fund: 350*2 ($700)
Application Fee: 75*2 ($150.00)
Total request: ($2060)

Photos from their previous explorations can be viewed and are available for purchase online via PayPal at their website - www.ThePeopleFly.com.
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Book Review: The Poetry of Environmental Education

April is a spectacular month celebrating the environment and the written word. This week we celebrate Earth Day (April 22) and Arbor Day (April 24) and we're still celebrating National Poetry Month. So, this week I am recommending a book of poems about the nature world.

Title: The Seldom-Ever-Shady Glades
Author & Illustrator: Sue Van Wassenhove
Publisher: Word Song of Boyds Mill Press

I have never experienced a book quite like this one. The illustrations of natural scenes of the Florida Everglades are actually quilts! For each poem there is a corresponding quilted illustration – of herons fishing, manatees and rays swimming in the deep blue, palm trees swaying in the wind, birds nesting, and alligators with mouths agape. She uses poems, both short and long, to portray very accurate scenes of food web dynamics, colorful biodiversity, animal courtship rituals, animal behavior, and life in the perilous Everglades. Ideal for students in grades 4-7.

I'm very taken by the art of this book. As a child I only thought of quilts as sets old heavy bed covers made scrap pieces of materials. It wasn't until I was older that I came to appreciate the artistry, craftsmanship, mathematics, and creativity of quilts. In African-American history classes I learned that many slaves and later freed slaves used quilts to tell family histories and stories of escape. I later learned about the art and craft of quilting. Quilters - whether individual or a group, would work for hours arranging scraps of cloth in precise geometric patterns to create something both beautiful and functional. So, I am really in awe by the author and illustrator of this book for creating such lovely nature scenes that are so colorful and creative. Textile art is such a beautiful way to express oneself and it uses products of nature, too. How green!

I'll be thinking about this book when I go visit the Mary Lee Bendolph, Gee's Bend Quilt Exhibit at the Missouri History Museum in St. Louis. If you live in the area or if you and your family are coming in the St. Louis area for vacation this summer you must stop by and see it. The exhibit is on display until September 13, 2009.
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Book Review: Environmental Education Books

Monday is my book review day but did you know that April is also National Poetry Month and that this is National Library Week? It is also a month dedicated Environmental Awareness because we celebrate National Environmental Education Week (April 12-18) Earth Day (April 22) and Arbor Day (April 24).
Knowing how much I love to piggy-back on themes I’ll be recommending some great environmental titles and poetry books that you can check out at your local library.

Title: The Monarch’s Progress: Poems with Wings
Author & Illustrator: Avis Harley
Publisher: Word Song of Boyds Mill Press

I thoroughly enjoyed this book of poems about Monarch Butterflies. Ms. Harley uses clever poems to explain monarch butterfly development, behavior and their impressive migration flight. At the end of the book, she elaborates on the butterfly lifecycles. I especially like the cross-disciplinary potential of the book. She uses over a dozen poetic styles that are easy to read and entertaining. It is also a great book to for literacy and language arts. Ideal for students in grades 2-5.
Title: Our Three Bears
Author: Ron Hirschi; Photographer: Thomas D. Mangelsen
Publisher: Boyds Mills Press

Can you name the three species of bears that call North America home? They are the Black bear of the United States and Canada, the Grizzly Bear of the Pacific Northwest including Canada and Alaska, and the Polar Bear of the Arctic regions of Alaska and Canada. Our three bears – black, brown, and white – are apart of our shared national heritages. They are the largest land predators of their respective environmental systems. What I like best about this book is how the author presents a compare and contrast picture of the three bears in this photograph-rich trade book. Ideal for students in grades 3-5.



Title: Marvels in the Muck: Life in the Salt Marshes
Author: DougWechsler
Publisher: Boyds Mills Press

Wetlands are very important environmental systems that are home to beautiful waterfowl, reptiles, mammals, invertebrates, and lots of biting insects. If you live in Florida, Louisiana, or any place with “Bay” or “Gulf” in the name, then this an introductory ecology book about your home – coastal wetland communities. Each of the four chapters introduces readers to the animals, plants and climate changes of the progressing seasons. The book details food chain and web dynamics, animal behavior, bird migration, and relationship between the ocean and fresh water systems. I wish I had this book as a younger student. Ideal for students in grades 6-8.


Finally, I want to say that it is purely coincidence that I reviewed three titles published by the same company. However, I do want to say that this publisher has greatly impressed me with their ability to consistently publish quality children’s science books. I like most of their books I read for the Animal Behavior Society Outstanding Children’s Book Award.
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Science journalism and the public understanding of science

I didn't have much to say about the results of last year's U. S. elections, except for this. After all, this is mainly a blog about science rather than politics.

However, politics is never that far off stage. There has been abundant evidence since the elections that, politically speaking, things are definitely looking up for science in the U. S. I don't think I need to take time now to enumerate the details.

Nevertheless, while science is in a much better place politically now, it is still in a very awkward place socially, as I went into somewhat here.

As further illustration of the theme of the social and economic problems that science is now faced with, let me offer just a few references, with special emphasis on problems besetting science journalism and the conflicts between bloggers and "real" science journalists:

Scientists & Science Journalism in the age of Blogging
A science blogger makes some observations, and provides an abundance of links, on the controversy that erupted last December on the news that CNN had axed its entire science team.

Science journalism: Supplanting the old media?
Science journalism is in decline; science blogging is growing fast. But can the one replace the other, asks Geoff Brumfiel.

Review: The Open Laboratory: The best science writing on blogs 2008
A very mainstream media publication, NewScientist, uses the occasion of (what was purported to be) a book review – on a collection of highly rated science blogging – to slam bloggers ("While newspapers may indeed have an abysmal track record when it comes to reporting on science, many blogs out there are far worse.") – rather than to review the book. (Talk about examples of "responsible" and "objective" journalism.)

On science blogging and mainstream science writing...
In response to the previous travesty, a journalist/blogger offers a responsible, even-handed view of science writing in the blogs vs. the mainstream media.

Adumbrating a theme we'll take up later, regarding the death of the newspaper industry, there's this:

A tired "solution" to the newspaper dilemma
Some reasons, but hardly the only ones, why the newspaper industry is failing.

And let's not forget that all this is really about a problem that's larger and more important than the demise of a bad business model or a technologically obsolescent industry:

American Adults Flunk Basic Science
A new national survey commissioned by the California Academy of Sciences and conducted by Harris Interactive reveals that the U.S. public is unable to pass even a basic scientific literacy test.


There's no time to discuss those items in detail right now. Read them if you want some background. I'll come back to the problems of newspapers and science journalism in general, but first some reflections on the overall importance, which is rather ambiguous, of science in our society. The problem is larger than journalism – it encompasses our educational system too.

On the one hand, many scientific activities are generally well-regarded and well-respected – even admired. That list includes, just to give a few examples, space exploration, the science and technology underlying computers and other electronic technology, and many aspects of scientific medicine.

But on the other hand, there are many problems as well. There are significant amounts of skepticism regarding climate science and the risks of global warming. The science of evolution by natural selection is under constant attack for purely ideological reasons. Many people are distrustful of, or even hostile to, various parts of scientific medicine, and instead place their faith in unproven, or even untested, forms of "alternative" medicine.

In addition, economic problems are hastening the demise of traditional forms of journalism that in the past have provided the public with generally accurate and essential information about scientific matters that affect the public welfare. Science journalism that remains appears, at least to some observers, to be increasingly shallow and superficial.

And if all that weren't enough, there are serious questions about the adequacy of the quantity and quality of instruction in public elementary and secondary schools. Although public school teachers of science and mathematics generally continue to do their best under difficult circumstances, they often face an uphill struggle against cuts to educational budgets, the meddling of ideological interest groups that want to control or limit the teaching of subjects like evolution, and the difficulties of keeping up with the robust growth of scientific knowledge.

All this is occurring at a time when strength in public understanding of science is needed more than ever in order to cope with serious problems such as climate change, new and possible epidemic diseases, depletion of natural resources like water and energy sources in a world of rapid population growth, side-effects of pollution and environmental damage caused by increasing use of technology by this same growing population, the existential threats posed by proliferation of rapidly evolving "weapons of mass destruction", and the emergence of new kinds "weapons" aimed not at people but at global information and financial infrastructure.

There's a lot to be worried about these days. But at the same time, we are still in the early stages of development of new, powerful information and communication technologies – the Internet, wireless communication services, and cheap, portable devices to receive, digest, and store a flood of electronic information "content".

And on top of that, biotechnology may, at long last, be ripening to the point where developments of new ways to protect and enhance health and longevity are close at hand. Among the possibilities are stem cell therapies, new kinds of vaccines and antibiotics, "personalized" medicine, and effective treatments for devastating diseases like cancer, deadly endemic and pandemic infections, heart disease, and diabetes. But there are important public policy issues in this as well – especially how to make it widely available without further inflating the already hefty amount of gross domestic product allocated to health care.

All this is to say that "public understanding of science" is at least as important as ever. Yet two of the main institutions that should be responsible for building and maintaining this understanding are deeply troubled.

I don't have the answers, of course, but now let me return to a narrower issue – the collapse of the newspaper industry – that very well serves as a metaphor for the larger problem

Regarding the fate of newspapers, and probably other forms of communication printed on paper (i. e. journals), consider this essay of Clay Shirky (with thanks to Digby):
[O]rganizational forms perfected for industrial production have to be replaced with structures optimized for digital data. It makes increasingly less sense even to talk about a publishing industry, because the core problem publishing solves — the incredible difficulty, complexity, and expense of making something available to the public — has stopped being a problem. ...

When someone demands to know how we are going to replace newspapers, they are really demanding to be told that we are not living through a revolution. They are demanding to be told that old systems won’t break before new systems are in place. They are demanding to be told that ancient social bargains aren’t in peril, that core institutions will be spared, that new methods of spreading information will improve previous practice rather than upending it. They are demanding to be lied to.


Shirky is talking about technologically driven "revolutions" in the ways of society. The change that the distribution of scientific information is undergoing is one of these revolutions. And about revolutions he says:
That is what real revolutions are like. The old stuff gets broken faster than the new stuff is put in its place. The importance of any given experiment isn’t apparent at the moment it appears; big changes stall, small changes spread. Even the revolutionaries can’t predict what will happen. Agreements on all sides that core institutions must be protected are rendered meaningless by the very people doing the agreeing. (Luther and the Church both insisted, for years, that whatever else happened, no one was talking about a schism.) Ancient social bargains, once disrupted, can neither be mended nor quickly replaced, since any such bargain takes decades to solidify.

There's a lot of debate going on right now – as far as people interested in and involved with science are concerned – over more than just the fate of science journalists who rely on print media for a living. There's debate over exactly how the results of scientific research is recorded and communicated to other scientists, let alone to the general public.

Here's Shirky again, speaking of newspapers but applicable to much else besides:
So who covers all that news if some significant fraction of the currently employed newspaper people lose their jobs?

I don’t know. Nobody knows. We’re collectively living through 1500, when it’s easier to see what’s broken than what will replace it. The internet turns 40 this fall. Access by the general public is less than half that age. Web use, as a normal part of life for a majority of the developed world, is less than half that age. We just got here. Even the revolutionaries can’t predict what will happen. ...

[T]here is one possible answer to the question “If the old model is broken, what will work in its place?” The answer is: Nothing will work, but everything might. Now is the time for experiments, lots and lots of experiments, each of which will seem as minor at launch as craigslist did, as Wikipedia did, as octavo volumes did.

Journalism has always been subsidized. Sometimes it’s been Wal-Mart and the kid with the bike. Sometimes it’s been Richard Mellon Scaife. Increasingly, it’s you and me, donating our time.

Perhaps, in these revolutionary, transitional times, when old, accustomed ways are breaking down, people who are earnestly concerned about such things as science and "public understanding" of science will have to take matters into their own hands.
For the next few decades, journalism will be made up of overlapping special cases. Many of these models will rely on amateurs as researchers and writers. Many of these models will rely on sponsorship or grants or endowments instead of revenues. Many of these models will rely on excitable 14 year olds distributing the results. Many of these models will fail. No one experiment is going to replace what we are now losing with the demise of news on paper, but over time, the collection of new experiments that do work might give us the journalism we need.


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Firefly Watching Time again

It's that time again. The Museum of Science (in Boston, Massachusetts) is sponsoring another year of citizen science. Everyone from everywhere is asked to keep an eye out for fireflies in their neighborhoods. Why?  Many scientists think the numbers of variety of firefly species are declining.

Today, was the kickoff for the summer citizen science project - Firefly Watch.  If I were in Boston, I sure would have been there, and had my little niece in tow.

The day long celebration and outreach program included brief introductions by firefly scientists Dr. Don Salvatore, Dr. Chris Cratsley, Dr. Kristian Demary, and Adam South.  There were also a hosts of children friendly events.
Join me again this year and report about the fireflies you see.  In fact, journalists want to hear from you - junior naturalists, citizen scientists. According the the Firefly Watch newsletter Boys' Life magazine is looking for boys age 7 - 17 for a feature article. TheCommunity Newspaper Company in Massachusetts is also looking to talk to participants of any age in towns across the state. Interested? Contact Mike Morrison for more information: mmorrison@mos.org.
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Wordless Wednesday: Red Buds Blooming




This is also my submission for Thematic Photographic 44 - Edible. The tiny delicate flowers, which sprout directly from the stems and branches, are edible. I tried one myself. The taste reminds me of grapeseeds. They make a nice colorful addition to a spring salad of greens.
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Amino acid chirality

We've discussed the mystery of amino acid chirality – the fact that all biological amino acids on Earth seem to be left-handed. Previous discussion and background are here.

In that earlier discussion we considered a hypothesis that was described last year. It is known that amino acids can be formed in interstellar space. The hypothesis suggests that the first amino acids on Earth were carried here by meteorites. Further, there was some excess of left-handed over right-handed amino acids (but not necessarily entirely the left-handed kind) that arrived this way.

The last detail is to explain how the imbalance of one handedness over the other occurred in space. That could be explained by the fact that light that is strongly polarized could selectively destroy one enantiomer (alternative chiral form of a molecule) of an amino acid. Such light is emitted by rapidly spinning neutron stars. But, as we'll see, there are other possibilities.

This hypothesis was expounded by Ronald Breslow of Colombia University. He has conducted experiments that showed a small initial imbalance could be amplified by successive evaporations of solutions containing phenylalanine, a process that could easily have occurred on Earth. [2] [3]

Although experiments were done to verify the plausibility of the various mechanisms required, there's no direct evidence that the supposed sequence of events is actually responsible for the observed chirality. However, ten years ago analyses of the Murchison meteorite by Sandra Pizzarello and John Cronin did find a preponderance of left-handed amino acids. There was a possibility that this finding could have resulted from some process occurring after the meteorite hit the ground. But last year Pizzarello and others analyzed another meteorite that fell in Antarctica and seemed especially pristine. The researchers reported that there was a similar chiral imbalance in that sample as well, and not only in amino acids but also in precursor aldehydes. [1]

Now there is still more evidence for chiral imbalances – in the Orgueil meteorite, which fell almost 150 years ago:

Clues To A Secret Of Life Found In Meteorite Dust (3/17/09)
Over the last four years, the team carefully analyzed samples of meteorites with an abundance of carbon, called carbonaceous chondrites. The researchers looked for the amino acid isovaline and discovered that three types of carbonaceous meteorites had more of the left-handed version than the right-handed variety – as much as a record 18 percent more in the often-studied Murchison meteorite. "Finding more left-handed isovaline in a variety of meteorites supports the theory that amino acids brought to the early Earth by asteroids and comets contributed to the origin of only left-handed based protein life on Earth," said [Dr. Daniel] Glavin.

There's also evidence about how the imbalance may have occurred:
The team also found a pattern to the excess. Different types of meteorites had different amounts of water, as determined by the clays and water-bearing minerals found in the meteorites. The team discovered meteorites with more water also had greater amounts of left-handed isovaline. "This gives us a hint that the creation of extra left-handed amino acids had something to do with alteration by water," said [Dr. Jason] Dworkin.

The researchers focused on the amino acid isovaline, because it can "preserve its handedness for billions of years, and it is extremely rarely used by life, so its presence in meteorites is unlikely to be from contamination by terrestrial life."

Here's the abstract of the research paper:

Enrichment of the amino acid l-isovaline by aqueous alteration on CI and CM meteorite parent bodies
A large l-enantiomeric excess (ee) of the α-methyl amino acid isovaline was found in the CM meteorite Murchison (lee = 18.5 ± 2.6%) and the CI meteorite Orgueil (lee = 15.2 ± 4.0%). The measured value for Murchison is the largest enantiomeric excess in any meteorite reported to date, and the Orgueil measurement of an isovaline excess has not been reported previously for this or any CI meteorite. The l-isovaline enrichments in these two carbonaceous meteorites cannot be the result of interference from other C5 amino acid isomers present in the samples, analytical biases, or terrestrial amino acid contamination. We observed no l-isovaline enrichment for the most primitive unaltered Antarctic CR meteorites EET 92042 and QUE 99177. These results are inconsistent with UV circularly polarized light as the primary mechanism for l-isovaline enrichment and indicate that amplification of a small initial isovaline asymmetry in Murchison and Orgueil occurred during an extended aqueous alteration phase on the meteorite parent bodies. The large asymmetry in isovaline and other α-dialkyl amino acids found in altered CI and CM meteorites suggests that amino acids delivered by asteroids, comets, and their fragments would have biased the Earth's prebiotic organic inventory with left-handed molecules before the origin of life.

Note that evidence in the samples analyzed was not consistent with circularly polarized light as a cause of the imbalance, and a process involving water seems more likely.

Other accounts of this research: [6], [7]

There's other relatively recent research that demonstrates another way enantiomeric excesses of one form of amino acid could be produced. When inorganic materials are irradiated with high-energy photons (e. g. X-rays), they may emit electrons whose spins are polarized in a specific direction by a magnetic field. Experiments showed that this could affect the chirality of organic molecules adsorbed on the surface of a magnetic material:

Electrons put a new spin on chirality (11/5/08)
Researchers in the US have shown that the presence of spin-polarized electrons can make a chemical reaction involving “right-handed” molecules occur faster than the same reaction involving “left-handed” molecules. The discovery could help scientists understand why nature favours a certain handedness in many biological molecules.

Although the organic molecule used in this experiment was butanol (not an amino acid), the researchers plan to perform a similar experiment with the amino acid alanine. While this research doesn't show this is the mechanism actually responsible for left-handedness of amino acids found on meteorites, it's a least a possibility.

Press release on this research: [4]



ResearchBlogging.org
Glavin, D., & Dworkin, J. (2009). Enrichment of the amino acid L-isovaline by aqueous alteration on CI and CM meteorite parent bodies Proceedings of the National Academy of Sciences DOI: 10.1073/pnas.0811618106


References and further reading:

[1] Key To Life Before Its Origin On Earth May Have Been Discovered (2/28/08)

[2] Amplification of enantiomeric concentrations under credible prebiotic conditions – July 2006 research paper by Ronald Breslow and Mindy S. Levine

[3] Radiation-induced racemization and amplification of chirality: implications for comets and meteorites – February 2007 research paper

[4] Possible Mechanism For Creating 'Handedness' In Biological Molecules (12/2/08)

[5] Rock Offers Mirror-Image Clues to Life's Origins (10/5/08) – good overview article in the Washington Post

[6] Did lefty molecules seed life? (3/16/09) – The Scientist

[7] Southpaw Solar System (3/16/09) – ScienceNOW

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Reaching Urban Youth with Educational Hip-Hop

I believe in reaching learners at their own level. Use whatever tools possible to relate to them...and make it fun and memorable. Why education become synonymous with boredom. No wonder many children dread the school day.

Back during election time, students from Clark Academy of Atlanta, Georgia re-wrote T.I.'s "Whatever You Like" into a very accurate and jamming civics lesson. I know the concept of merging pop art and education isn't a new concept, especially in urban areas; but it still doesn't get it's due.

More recently, acclaimed forest ecologist and Evergreen State University researcher Dr. Nalini Nadkarni established a very successful summer program for high school students. It was a hit! Ecologists like Dr. Nadkarni and her colleagues worked together with free-style MC C.A.U.T.I.O.N. to introduce environmental science concepts to urban and rural students.

Hip-hop catches a bad rep at times. It is merely a medium to communicate. And it seems obvious to me it can communicate some positive things as well. But hey, I'm a fan so of course I'm defensive.

And as much as I am all about science education, no student can appreciate the subject without command of language and literacy. My aunt, an educator herself and education administrator for the state of Wisconsin, reminded me of this fact. She recommended that I find a way to incorporate literacy in my science lessons. "How?" I asked. "Science is so different than English." "It is." She admitted but it can be done. hen she taught math and science in inner-city Chicago Public Schools she taught relevant vocabulary words when she introduced new lessons. She required students to use these new words in sentences and different contexts and she taught them how to research and find supporting information to marry several related topics. Whew! That's alot. I try to perfect my teaching skills, but that conversation reminded me there is so much more to learn. Integrative projects and collaborations are important - not just for winning competitive grants - but also for making an impact. I'm opening my eyes (and ears) for cross-discipline opportunities.

With that in mind, I wanted to share this very recent discovery with you all. Black Jones of St. Louis, Missouri, was concerned about the academic achievement of his children and others in his community. Thinking back to his own memorable classroom experiences that involved music, movement and fun, he came up with a great formula - Educational Hip-Hop. This is a video of one of their Language Arts Hip-Hop Lessons, "I Know My Verbs".


For more information about Black Jones educational program, visit his website U Make It Happen.
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Professor Jerry O. Wolff remains found

Ten months ago I posted a memorial to a former professor of mine, Jerry O.Wolff. He was an ex-officio committee member of mine. News in the animal behavior and small rodent research circles spread quickly about his apparent suicide in the Canyonlands National Park in Utah. His notes to relatives and friends stated he wanted to return his body and soul to nature and asked for no one to look for him and leave his body alone. Being a strict ecologist, I can understand that wish. However, there was a big search for him that was unsuccessful. Jerry Wolff was a surprisingly rugged outdoorsman; and he obviously found a very remote place for his last moments. Just a few days ago, his remains were found. The truth is, his remains may have remained undiscovered if it weren't for another very experienced hiker who came across his body at a base of a cliff.

Most people who choose to end their lives in natural areas usually do so within a few hundred feet of major hiking or landscape entries. Could you imagine the horror and scarring of a young child who discovered a dead, decaying, insect/animal swarming body while on a family outing? I'm very glad Jerry chose a very private place to end his life. The account of the story can be accessed at the Star Tribune Newspaper of Minneapolis-St. Paul.
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Wordless Wednesday: Concrete Jungle

Life sprouting from concrete and asphalt: Urban Wildlife Scenes


All pictures taken by DNLee in St. Louis, MO (Lafayette Park and Benton Park neighborhoods.
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