Summary of Section 2 Nucleic acids are intrinsically highly flexible molecules. The chemical properties of nucleic acid components are primary determinants in structure formation. The formation of nucleic acid structures is driven by base pairing and stacking interactions between the hydrophobic bases. In DNA, these interactions drive the formation of the double helix, whose structure is maintained under torsional stress by twisting. RNA second
2.4 Analysis of nucleic acids by electrophoresis and hybridisation Nucleic acids can be separated according to size by gel electrophoresis, most commonly performed using a horizontal gel (Figure 7a). This is in contrast to the vertical gel electrophoresis set-up, which is generally used for analysis of proteins. The size of DNA molecules is usually expressed in terms of the number of
3.2 Trimeric G proteins G proteins are attached to the cytosolic face of the plasma membrane, where they serve as relay proteins between the receptors and their target signalling proteins. Trimeric G proteins interact with 7TM receptors and are all heterotrimeric, having structurally different α, β and γ subunits. Monomeric G proteins are the small G proteins, such as Ras, which are structurally related to the α subunit of trimeric G proteins. The three-dimensional structure of trimeric G proteins in
Onderzoekend leren : Case Based Learning Deze website omvat multimediacases (videobeelden en reflectietaken) om analyse en discussie op gang te trekken in de didactiek van onderzoekend leren. Iedere case kenmerkt een gelijkaardige structuur:
Hong Kong protest site opens up
Normality returns after Hong Kong police clear the main pro-democracy protest site but some defiant campaigners remain. Paul Chapman reports
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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 international news. For over 160
2.3 Summary of Section 2 After ejaculation some sperm penetrate the cervical mucus, and on arriving in the uterus become capacitated. A few sperm swim up the Fallopian tube containing the recently ovulated egg. In the tube the sperm become activated. This involves changes to the membranes and a change in the swimming pattern. Enzymes from the acrosome allow the sperm to get next to the egg, by removing follicle cells and digesting a path
The physical world: waves and relativity
An introduction to this album.
The Power and Politics of Flags [Audio]
Speaker(s): Tim Marshall | There will be a short LSE100 Award Ceremony for outstanding achievements on the LSE100 course followed by a talk and Q&A session with Tim Marshall. For thousands of years, flags have been the visual representation of our hopes and our destinies. We wave them. Burn them. March under their colours..... and still in the 21st Century we die for them. They represent the politics of high power and the politics of the mob. In his lecture, based on his latest book Worth Dying
Collection #10113
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Routage dans les petits mondes
Les petits mondes sont des réseaux - réseaux sociaux, réseaux d’ordinateurs ou autres - dans
lesquels on peut trouver facilement un chemin très court entre toute paire de points, sans connaître le réseau globalement.
1.3.7 Corporate connections continued One issue that might be added by a workers' organisation or trade union, for instance, might be that of freedom of association and the right of workers to organise. Another might be the right to collective bargaining. In fact, the coverage of the codes of conduct vary considerably depending on who instigated the code and the parties involved (Pearson and Seyfang, 2001). Most codes of conduct, it seems, are top-down affairs, drawn up by the companies involved or by trade associations. Some hav
1.5.3 The doctor-nurse relationship In reality, however, the nurse spends much more time with patients and often knows a lot that the doctor does not. Somehow the nurse needs to be able to communicate essential knowledge to the doctor, in the patient’s presence, without appearing to undermine the doctor’s ‘omniscient’ status. According to Leonard Stein’s research in America, they achieve this through playing ‘the doctor–nurse game’. T Longitudinal Data Analysis Homeworking mom 4.1 Family and meanings? We have considered the difficulties of pinning down family definitions and meanings. We now ask whether it is indeed important to explore and unravel these complexities. Do the varieties of family meanings – or the meaning of ‘family’ itself – matter, or do they just provide a minor intellectual diversion? You may like to pause here for a moment to consider how you would answer this question for yourself. Do you think they matter, and if so, in what ways? We consider this questi Drawing from Experience - Contour Line 4 Thinking about adaptation Section 3 identified a range of adaptations in insect eaters, most linked with their mode of feeding. Particular structures are identified as having particular functions. But there are problems with the concept of adaptation if it's taken too far. Not all features of an organism have to be functional in ways that perfectly su TALAT Lecture 1100.01: Introduction: Aluminium, a Light Metal Conclusion This free course provided an introduction to studying the arts and humanities. It took you through a series of exercises designed to develop your approach to study and learning at a distance and helped to improve your confidence as an independent learner. Introduction This course explores origins of the Universe by looking in detail at events immediately following the Big Bang. Starting with looking at the cooling of the very early Universe, the course then moves on to the inflation era, the quark-lepton and the hadron era. Then the course looks at how fundamental particles began to synthesise to form nuclei, and from here it discusses the development of larger structures like stars and galaxies. By examining closely the forces in play and the interactions
Organised by ESRC National Centre for Research Methods, to be held at Centre for Applied Statistics, Lancaster University Lancaster United Kingdom from 2009-05-05 to 2009-05-06
Homeworking mom offers advice on employment opportunities to women with parenting responsibilities working from home. The site was created by Georganne Fiumara, founder of the MothersÂ’ Home Business Network, and contains sections on freelancing, internet work, and running a business. The site also includes The Real Deal, a blog devoted to aspects of homeworking.
This cartoon animation describes contour lines for young art students. (1:43)
This lecture provides basic information about the history of aluminium, the principles behind the production of primary metal, environmental properties, potential applications, areas of application. The lecture is recommended for those situations, where a brief, general background information about aluminium is needed as an introduction of other subject areas of aluminium application technologies. This lecture is part of the self-contained course "Aluminium in Product Development", which is trea
