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外媒有偏见 新疆7.5事件被移花接木
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Dierenportetten naar de kunstenaar Andy Warhol
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Tien werkbladen waarbij het volgende aan bod komt:

  • Achtergrondinformatie Andy Warhol
  • Wat is popart?
  • Wat zijn de kenmerken?
  • Oefening: stappenplan dierenportret met acrylverf. 

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Replacing the Nation: South Africa's passive revolution? [Audio]
Speaker(s): Professor Gillian Hart | In the light of the conflicting forces that have unfolded in South Africa over the last decade, Gillian Hart takes a fresh look at the nation’s transition from apartheid. Based on Professor Hart’s forthcoming book, this lecture will explore the simultaneous processes of South African de-nationalization, re-nationalization and ‘elite pacting’, before examining how this fits within contemporary debates over passive revolution. Gillian Hart is Professor
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Faces of Penn State 3 (v3.1) - Nov. 2012
Faces of Penn State showcases the personal accomplishments, public contributions and pioneering spirit resulting from the Penn State experience, education and community. Learn more at http://faces.psu.edu.
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McMaster Welcome Speeches: Dr. Patrick Deane, President and Vice Chancellor
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The Finale | Lecture 13 (2012)
Description: Ferran Adrià, elBulli Foundation
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Concert in Your Cranium
Watch here as experimental musician Mark Stewart of Polygraph Lounge plays a duet of every member of our audience. Using a small instrument of his own design, Mark teaches participants to use the bones in their skull as a resonator, creating 200 individual creative experiences.  (02:25)

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Usman Riaz and Preston Reed: A young guitarist meets his hero
Usman Riaz is a 21-year-old whiz at the percussive guitar, a style he learned to play by watching his heroes on YouTube. The TED Fellow plays onstage at TEDGlobal 2012 -- followed by a jawdropping solo from the master of percussive guitar, Preston Reed. And watch these two guitarists take on a very spur-of-the-moment improv.Preston Reed’s hands have an otherworldly coordination. The fingers, nails, thumbs, and palms of both left and right dance, pluck, strum, and slap his guitar, which bur
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George H.W. Bush - Mini-Biography
A World War II veteran, George H.W. Bush served as Vice President for two terms before being elected President of the United States in 1988. (04:35)


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Babbage: December 12th 2012


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Breakingviews: Central banks at Sea
Dec. 12 - Incoming BoE Governor Mark Carney's avocation of nominal GDP targeting is a dubious tweak to current policy. The trade's intellectual armoury looks empty, says Breakingviews.
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U.S. Morning Call: Markets look to Fed for more stimulus
Dec 12 - The U.S. Federal Reserve is expected to announce a fresh round of bond buying as part of its efforts to support an economic recovery with low interest rates.
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How Far Can a Shirt See: The Birth of a Revolution in Fibers and Fabrics

Fibers and fabrics are among the earliest forms of human expression; these materials shield us from the environment and play an important role in defining who we are. Surprisingly, in sharp contrast to other areas of our existence, fibers have remained practically unchanged for thousands of years.

Can fibers become highly functional objects similar to computers and smartphones? Can they see, hear, sense, and communicate? Our research focuses on extending the f
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4.3 Reducing the nutrient source

Europe is the continent that has suffered most from eutrophication, and increasing efforts are being made to restore European water bodies damaged by nutrient enrichment. If the ultimate goal is to restore sites where nature conservation interest has been damaged by eutrophication, techniques are required for reducing external loadings of nutrients into ecosystems.

Although algal production requires both nitrogen and phosphorus supplies, it is usually sufficient to reduce only one major
Author(s): The Open University

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2.1 Effects on primary producers in freshwater ecosystems

Plant species differ in their ability to compete as nutrient availability increases. Some floating and submerged macrophyte species are restricted to nutrient-poor waters, while others are typical of nutrient-rich sites (see Table 2.2). Figure 2.2 shows turbid water in a polluted drainage ditch associated with localized growth of algae. There are no aquatic plants present.

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1.2 Resource availability and species diversity

A wide range of ecosystems has been studied in terms of their species diversity and the availability of resources. Each produces an individual relationship between these two variables, but a common pattern emerges from most of them, especially when plant diversity is being considered. This pattern has been named the humped-back relationship and suggests diversity is greatest at intermediate levels of productivity in many systems (Figure 1.5).

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8.2 Chromosome scaffolds

Most of the chromosomal DNA chains within the interphase nucleus are believed to be held on a scaffold or backbone structure made from various proteins, with loops of between 20 and 200 kb extruding from attachment sites. This chromosome structure is shown schematically in Figure 40. The scaffold, as well as permitting further compaction, serves to bring the DNA together in organised regions. There are many different protein components of these scaffolds, amongst them DNA topoisomerases.


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Nucleosomal DNA packaging into a 30 nm fibre: the role of histone H1

When chromatin is isolated from the nucleus and examined under the electron microscope, it can be seen as a 30 nm fibre. This fibre is formed through the action of the histone H1 on the nucleosomal DNA in the 10 nm fibre. In contrast to the other histone proteins, H1 does not contain the histone fold motif.

Compaction of the 10 nm fibre to give the 30 nm fibre is achieved by interaction of the H1 protein with both the linker DNA and the histone octamers, as shown in Figure 31
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DNA supercoiling and protein binding in the E. coli chromosome

As discussed earlier, the DNA of the E. coli chromosome is highly negatively supercoiled due to the action of the DNA gyrase enzyme (Section 3.2). This negative supercoiling serves to assist in compaction of the DNA, with the repulsive forces of the sugar-phosphate backbones being counteracted by polyamines. Many of the proteins
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7.2 The eubacterial chromosome

Some of the diverse roles of chromatin components can be illustrated by examining the E. coli chromosome. Like most prokaryotes, E. coli has a single chromosome consisting of a single double-stranded circular DNA molecule. There is no nucleus present, but the E. coli DNA is within a discrete entity in the cytoplasm called the nucleoid. The nucleoid contains a multitude of proteins and is in close proximity to the ribosomes, where translation occurs. In addition to
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