How able a King was Richard III? Rising food prices in Kenya A short video depicting the problems faced by Kenyans as a result of sharply rising food prices (such as the price of maize, beans and cooking oil). Extreme Photoshop Makeover A photographer and designer shows the photo retouching process in detail. Arctic Sea Ice 2008 The polar ice caps have been shrinking in summer and expanding in winter for millions of years. But in the last 3 decades, the arctic sea ice at the end of each summer's melt has been getting steadily smaller. 12.12.2012 – Langsam gesprochene Nachrichten Jonathan Trent: Energy from Floating Algae Pods ISS Update - Dec. 12, 2012 3XSQ: 3M, Dupont outlooks suggest growing economy Agent-Based Social Pedestrian Simulation for the Validation of Urban Planning Recommendations Verantwoord omgaan met Wi-Fi en gsm-straling op school Computers, gsm’s en allerhande moderne communicatietechnologie zijn niet meer weg te denken uit de leefwereld van kinderen en jongeren. Kinderen en jongeren en in toenemende mate ook hun ouders, verwachten dat ze hun toestellen ook op school … Spanish Naughts and Crosses 4.4 Reducing nutrient availability Once nutrients are in an ecosystem, it is usually much harder and more expensive to remove them than tackle the eutrophication at source. The main methods available are: precipitation (e.g. treatment with a solution of aluminium or ferrous salt to precipitate phosphates); removal of nutrient-enriched sediments, for example by mud pumping; and removal of biomass (e.g. harvesting of common reed) and using it for thatchi 2.4.1 Estuarine species Nutrient runoff from the land is a major source of nutrients in estuarine habitats. Shallow-water estuaries are some of the most nutrient-rich ecosystems on Earth, due to coastal development and the effects of urbanization on nutrient runoff. Figure 2.19 shows some typical nitrogen pathways. Nitrogen loadings in rainfall are typically assimilated by plants or denitrified, but septic tanks tend to add nitrogen below the reach of plant roots, and if situated near the coast or rivers can lead to 8.3 Chromosome distribution within the nucleus DNA from any one particular chromosome is a single chain, many millions of bases long, and this chain is attached to a scaffold structure. It is not surprising then, that if we examine the interphase nucleus, each chromosome is seen to fill a localised area. This localised distribution of individual chromosomes is illustrated in Figure 42 with an examination of human chromosomes within the interphase nucleus. In these examples, special DNA probes have been used to detect the location of the e 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. 8.1 Introduction The average human cell has around two metres of DNA within its nucleus. In the interphase nucleus, in which transcription and replication are going on, this DNA is packaged into nucleosomes that are variably compacted, through association with H1, into larger 30nm fibres. In fact, the average nucleus most likely contains DNA with a continuum of chromatin configurations, ranging from highly open 10 nm fibres, through to 30 nm fibres and fibres that are even more tightly packed together, call Core histone tail modification regulates DNA compaction What effect would neutralising the positive charges on the octamer N-terminal tails have upon the compaction of DNA by H1? The histone fold and formation of the nucleosome We have seen how in the eubacterial chromosome, bending DNA serves to facilitate its compaction. A similar process occurs in eukaryotic cells in that DNA is bent and wrapped around a protein unit. In this case, the core unit is a protein–DNA complex termed a nucleosome. The nucleosome comprises the core histone proteins H2A, H2B, H3 and H4 arranged in a structure known as the core histone octamer, with an associated length of DNA. In order to understand how the nucleosome is a The histone proteins The genes for the histone proteins are very highly conserved across eukaryotes, reflecting their importance in DNA packaging. The histone family consists of five groups of proteins, histones H1, H2A, H2B, H3 and H4. An examination of their amino acid content gives us clues as to how the histones fulfil their role in DNA packaging. Rather like the polyamines in bacteria, these proteins are highly positively charged, with up to 20% of their amino acids being lysine or arginine, the charged side The DPS protein compacts the eubacterial chromosome during stress When an E. coli cell enters into stationary phase, transcription and cell division cease completely. In such cells, the normal chromatin components, such as those described above, are replaced by a negatively charged protein called DPS. The interaction between DPS and DNA appears to be a specialised bacterial adaptation to survive starvation. In normal conditions of growth, the DNA within the bacterial cell is distributed evenly throughout the entire cytoplasm. In stationary cells, how
How able a King was Richard III? A presentation by Dr. David Grummitt, Senior Research Fellow, The History of Parliament Project, for The History Faculty: www.thehistoryfaculty.com.
History as written and presented by current historians. Visit thehistoryfaculty.com for free downloads and more information.
Trainiere dein Hörverstehen mit den Nachrichten der Deutschen Welle von Freitag – als Text und als verständlich gesprochene Audio-Datei.
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Nordkorea hat ungeachtet internationaler Kritik erneut eine Langstreckenrakete gestartet. Die Rakete habe einen Beobachtungssatelliten ins All gebracht, teilte die Regierung in Pjöngjang mit. Der Satellit habe inzwischen seine Umlaufbahn erreicht, meldet die staatliche Nachrichtenagentur KCNA. UN-Generalsekretär Ban Ki Moon verurteilte den Start al
Call it "fuel without fossils": Jonathan Trent is working on a plan to grow new biofuel by farming micro-algae in floating offshore pods that eat waste-water from cities. Hear his team's bold vision for Project OMEGA (Offshore Membrane Enclosures for Growing Algae) and how it might power the future. Not only does Jonathan Trent grow algae for biofuel, he wants to do so by cleansing waste-water and trapping carbon dioxide in the process. And it’s all solar-powered. (14:45)
The International Space Station video update for Dec. 12, 2012.
Dec 12 - 3M expects profit to rise about 8 percent next year as the U.S. economy continues its slow recovery; Dupont boosts 2012 outlook.
The goal of this project is a deeper understanding of the mechanisms that shape a city with a focus on pedestrian flow. Pedestrian flow reveals the use of space, the capacity and use of transportation and has an impact on the health of people. Movement patterns of pedestrians are a topic in many related fields like transportation planning, computer graphics and sociology. This project augments the simulation of pedestrian decision processes by taking into account the preferences for surrounding
Spanish Naughts and Crosses.
SAQ 34
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