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DNA topoisomerases

Topoisomerases create temporary strand breaks in DNA, thereby allowing the DNA to ‘swivel’ around the helical axis and releasing torsional strain within the area before resealing the break. With the cellular DNA in a supercoiled state, topoisomerases play a critical role in regulating both how tightly packed DNA is within the cell and the dynamic state of torsional energies during DNA processing. There are two classes of this enzyme: topoisomerase I (topo I) functions by breaking just one
Author(s): The Open University

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Copyright © 2013 The Open University

Potassium Chlorate and Gummy Bear
Molten potassium chlorate is a strong oxidizing agent that reacts violently with sugar. Gummy bears have lots of sugar in them.  This video shows what happens when the two are combined.  (01:03)
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Reaction of Sodium & Chlorine
This is a cool video of a reaction between sodium and chlorine.  The experiment is done professionally. (00:51)
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Burning Magnesium in Dry Ice
Declan Fleming shows you how to prepare and demonstrate burning
magnesium in solid carbon dioxide (dry ice). This dramatic and beautiful demonstration shows that oxygen isn't always a prerequisite for fire and reveals carbon's place in the reactivity series.  (03:14)

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Super Absorbent Polymers and Hydrophobic Sand! - Quirkles Science Experiment
Watery William, one of The Quirkles, KOLR 10, and Terri Johnson demonstrate some cool science experiments that involve the properties of water. Learn how jelly crystals (these can expand up to 300 times their original size!) and hydrophobic sand absorb and repel water.  (04:22)
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Checklist - Language Assistantship
This is a resource released as part of the E-Portfolio Toolkit based on experience of developing the “Year Abroad E-Portfolio”, undertaken by the School of Languages at Leeds Metropolitan University.
Author(s): Mara Fuertes-Gutiérrez,Juan Muñoz López,Janet P

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http://creativecommons.org/licenses/by-nc-sa/3.0/

Families displaced by Pakistani airstrikes appeal to government to open roads
Residents fleeing from a Pakistan military operation to flush out insurgents appeal to authorities to open up roads so that they can move their families to safety. Natalie Thomas reports. Subscribe: http://smarturl.it/reuterssubscribe More updates and breaking news: http://smarturl.it/BreakingNews Reuters tells the world's stories like no one else. As the largest international multimedia news provider, Reuters provides coverage around the globe and across topics including business, financial,
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Dark Energy
The universe is huge and getting bigger all the time, and we have we have dark energy - the most mysterious force in the universe - to blame/thank for it. Thought to make up more than 70% of the energy in the whole universe, Hank describes how dark energy was theorized to exist, and how scientists are trying to explain it. (03:47)

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Interview with L.S. Asekoff
Grace Cavalieri interviews L.S. Asekoff for the Library's Poet and the Poem Series. Speaker Biography: L.S. Asekoff has published four books of poetry: Dreams of a Work (1994) and North Star (1997) with Orchises Press, and The Gate of Horn (2010) and the verse novella Freedom Hill (2011) with TriQuarterly/Northwestern University Press. His poems have appeared in such magazines as The New Yorker, American Poetry Review, and Ninth Letter, and he has received awards from the New York Foundation fo
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Dipper Mouth Blues
Thomas Brothers discusses Louis Armstrong, composer of King Oliver's "Dipper Mouth Blues." Speaker Biography: Thomas Brothers is professor of music at Duke University. For captions, transcript, and more information visit http://www.loc.gov/today/cyberlc/feature_wdesc.php?rec=5624.
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SWIB12- Culturegraph Authorities
By: SWIB SWIB12- Culturegraph Authorities Markus Geipel, German Nationsl Library (DNB)
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SWIB12 - Enrichment of Library Authority files by LInked Open Datat Sources
By: SWIB SWIB12 - Enrichment of Library Authority files by LInked Open Datat Sources, Gerd Zechmeister, Helmut Nagy, Semantic Web Company GmbH
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SWIB12 - First Insights into the Library Track of the OAEI
By: SWIB SWIB12 - First Insights into the Library Track of the OAEI Dominique Ritze, Mannheim University Library
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Season 2 – Lesson 36 – Coffee Break Spanish
Coming up in this lesson:

We’re returning to another episode featuring María-José and Andrew this week in which María-José will ask the question “¿Qué estás haciendo?” , what are you doing? We’re focusing on the present continuous tense.

Please note that lesson 36 of Season 2 was originally known as lesson 236 of Coffee Break Spanish. We have renumbered the lessons of each season as lessons 1-40 to make things more simple for our listeners.

Accessing the Premium Vers
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Intra Preneur Tim Ogilvie
Design Thinking for the "Intra-preneur"- How to Innovate within a Corporation, Tim Ogilvie, Peer Insight
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Fritz Haber: Great Minds
Hank introduces us to the brilliant and heartless Fritz Haber, a great mind who is considered "the father chemical warfare," but who also made discoveries and innovations that helped lead to the Green Revolution which is credited with preventing the starvation of over a billion people. (09:41)

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Expedition 34/35 Crew Profile, Version 1
Learn more about Flight Engineers Chris Hasfield, Roman Romanenko and Tom Marshburn of the International Space Station's Expedition 34/35 crew. The trio is set to launch in December to join their Expedition 34 crewmates -- Commander Kevin Ford and Flight Engineers Oleg Novitskiy and Evgeny Tarelkin-- who have been aboard the station since Oct. 25.
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E-Portfolio Toolkit - Booklet
This E-Portfolio Toolkit is based on experience of developing the “Year Abroad E-Portfolio”, undertaken by the School of Languages at Leeds Metropolitan University. We use an E-Portfolio to assess our students on their period abroad because we think it encourages them to fully engage with culture(s) and language of the target country and to reflect on the resulting cultural and linguistic development. As part of our project, we have also developed a set of learning activities and materials,
Author(s): Mara Fuertes-Gutiérrez,Juan Muñoz López,Janet P

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The Exchange: Business lessons from the Grateful Dead
Rob Cox talks to the New Yorker's Nick Paumgarten about how the rock band's focus on touring, taping and community presaged the post-album era of the music business.
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This Week @ Minnesota
THIS WEEK @MINNESOTA: Nov 26-30. In this episode of the weekly video feature, Sam and Lannie check out a 90-second business pitch contest at Carlson, find out how the U has illuminated students lives and learn about mental health resources that are available on-campus for students.
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