Summary of Section 3

  1. Watson–Crick base pairing arises due to hydrogen bonding between A and T and G and C and spatial limitations within the hydrophobic core of the helix.

  2. DNA commonly folds into the B-form helix; other forms such as Z-DNA form in vitro. A-form helices are formed primarily by duplex RNA.

  3. The twisting of DNA around its helical axis results in torsional stresses that promote the formation of high-energy alternative confo
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1.3.9 Internet resources

There are many websites where you will find useful information on health and lifestyle. With all information on the internet you need to make a judgement on the reliability of the information.

BBC HealthThe health pages on the BBC website.
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Sustainable Tourism Certification
A lecture on sustainable tourism
Author(s): Xavier Font,Leeds Metropolitan University

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5 The Devonian Period

Before going any further, click on 'View document' below and read pages 76-77 from Douglas Palmer's Atlas of the Prehistoric World. Do not worry too much about all the different names of fish groups in this, the 'Age of Fishes'.

View document

Environmental change is known to have a significant impact on the evolution of life. For example, widening oceans
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1.9 Europa

David A. Rothery Teach Yourself Planets, Chapter 9, pp. 107-39, Hodder Education, 2000, 2003.

Copyright © David Rothery

For all Io's majesty, its neighbour Europa excites the greatest scientific interest. Europa is a transitional world, with a density almost in the terrestrial planet league but an exterior that is icy down to a depth of about 100 km. It is not known whether the ice is solid throughout, or whether its lower part is liquid, which raises the fas
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Hemeroteca de La Vanguardia desde 1881
This website provides free access to the full text of La Vanguardia, a leading Spanish national newspaper based in Barcelona and Catalonia. All issues from February 1881 onwards can be downloaded providing extensive coverage of Spanish political, economic and social history, as well as more recent events. They include coverage of the Spanish civil war, General Franco, the restoration of the Spanish monarchy, elections in Spain and Spanish perspectives on current world events. Users may search th
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Digital Construction: Automated Design and Construction Experiments Using Customised On-Site Digital
This paper presents a currently on-going research trajectory, investigating integrated design and build work-fl ows using generative design strategies and custom built fabrication devices. The aim of the research, which is being developed through a series of experiments and workshops, is to explore scenarios in which these work-flows can produce emergent architectural structures which are highly adapted towards the intended performance within their specifi c context and site. The research has pr
Author(s): Ameijde, Jeroen van; Carlin, Brendon

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Rights not set

1.1 Introduction

Like many subjects, mental health is complex. This is partly because the language used in discussions about mental health is diverse, can mean different things to different people, and can sometimes be misleading. For example, the term ‘mental health’ is usually used in discussions about just the opposite: ‘mental illness’! There are, however, good reasons for the confusion surrounding its language. One reason is that decisions about what constitutes ‘mental health’, ‘men
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1.3 MacLean's Celtic roots

MacLean was born in 1911 in Osgaig, a small township on the Isle of Raasay, adjacent to Skye, the larger island where he went to school. His childhood was dominated by a majestic landscape. The woods of Raasay and the peaks of the Cuillin Hills on Skye are as central to his poetic universe as the hills of Cumbria to Wordsworth's. His father and mother combined work on a small croft with a tailoring business. The latter was severely hit by the great depression of the 1930s, and the family's re
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Thunderstorms - A Simple Introduction with Time-Lapse Photography
This video introduces two important and simple concepts that help us understand thunderstorms. We use two Tiwi Island "Hector" thunderstorms in different wind environments as examples. With the use of time-lapse photography we can see the effects of this wind shear on the storms. (13:07)
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TALAT Lecture 4701: Terms and Definitions for Adhesive Bonding
This lecture defines the terms and definition of adhesive bonding of metals; it describes the basic physical/chemical characteristics of adhesive bonding; it also describes the characteristics and the properties of adhesives used in metal bonding. General background in production engineering and material science, some knowledge of the physics and chemistry of metallic surfaces and polymer science is assumed.
Author(s): TALAT,Lutz Dorn, Technische Universität, Berlin

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Pharrell reminds kids to be happy on U.N. International Day of Happiness
Singer Pharrell Williams urges kids to seek happiness during the United Nation's program for the International Day of Happiness. Rough Cut (no reporter narration). 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, national, and internatio
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3.1 Features of the diving response

All the aquatic mammals' adaptations to life in the water - breathing, moving, staying warm and making sense of the environment - come together in their diving behaviour, and the diving abilities of marine mammals are truly awe-inspiring. The elephant seal, for example [p. 192], makes repetitive, long-duration dives and some 80-95% of its time at sea is spent submerged. Its dives are of about 20 minutes duration on average, and the intervals at the surface are seldom more than about two minut
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Aptamers

Aptamers are nucleic acid molecules that have been developed to mimic the selective and tight binding of other molecules such as antibodies. In order to identify an aptamer that is capable of binding to a target molecule, a process called Selex (systematic evolution of ligands by exponential enrichment) is utilised. The strategy relies upon a combination of a selective binding assay and amplification by PCR. A ‘library’ of short single-stranded DNA oligonucleotides is synthesised <
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2.2.4 Film cassette and grid

As the X-rays pass through the patient some of them will be scattered and will therefore not follow the expected line through the patient. If these reach the detector they will blur the image. Some of the scattered radiation can be removed by a grid, usually oscillating, placed between the patient and the detector.

Analogue imaging systems use either film alone (rarely) or a combination of a film and fluorescent material (phosphor). The phosphor fluoresces and produces visible light whi
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Babbage: Home-brewed heroin
How lab experiments got a step closer to yeast that can make morphine, and how app experiments by developers such as Facebook happen in New Zealand
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Mini Bridgeの効率的な使い方
このビデオではMini Bridgeについてご紹介します。Adobe Bridgeのパネル化されたバージョンであるMini Bridgeを使えば、利用中のアプリケーションを離れることなく、目的のアセットにアクセスできます。また、スライドショー、レート付け、並べ替えと言ったAdobe Bridgeと同様の機能が利用できます。
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5.5 Summary of Section 5

  1. Proteins are dynamic molecular machines. All proteins bind to other molecules, whether ions, small molecules or macromolecules, and these interactions are critical to the protein's function. The activity of proteins is regulated by changes in conformation.

  2. In allosterically regulated proteins, binding of one ligand affects the conformation of a remote part of the protein, thereby regulating interaction with a second ligand. Cooperative binding
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Health care that follows you from home to hospital and back
By: nsf Professor Marjorie Skubic from the University of Missouri has created a suite of health care technologies that identify when an individual falls in their home or when their physical behavior changes over time. However, how does a physician at a hospital know about and use information gathered by devices like those designed by Skubic for the home? And likewise, how does information about a patient's condition in the hospital get incorporated into technologies like Skubic's when they retu
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What's Really Going on During a Lunar Eclipse?
When we watch a lunar eclipse, what exactly are we seeing? And what is the moon's perspective of this cosmic event? Music is by Bradley Kemp. (02:34)
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