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Viewing upcoming talks containing the keyword: 7
Speaker: Sir Ed Southern (Oxford)
Prof Sir Ed Southern, FRS Oxford University, Professor of Biochemistry Emeritus The focus of this lecture will be discussing technology development for genomic and functional genomics analyses.In the mid-1970s, Ed Southern developed a technique for transferring DNA from gels onto nitrocellulose paper; the Southern blotting. It quickly became a widespread technique and provided a template for mapping the human genome. The following Northern and Western blotting procedures have made a huge impact on the study of genes and proteins, significantly advancing biomedical research.Later on, Ed made another crucial contribution with the development of microarray technology which allows parallelising large screening of biological material. Microarrays are widely used both in basic research as well as in clinical diagnostic settings.Ed Southern, who is a Fellow of the Royal Society, has received the Royal Medal of the Royal Society of London in 1998, was made a Knight Bachelor in the June 2003 and was awarded the Lasker Award in 2005. Currently, Ed Southern is the Founder, Chairman and Chief Science Advisor of Oxford Gene Technology. http://www.ogt.co.uk/about/company/management/board_members/professor_sir_edwin_southern Host: Silvia Paracchini
On: October 1, 2014 From: 15h30 To: 16h30View talk
Speaker: Mr Bernd Ebenhoch (University of St Andrews)
Organic solar cells have great potential for cost-effective and large area electricity production, but their applicability is limited by the relatively low efficiency. In this talk I report investigations of novel materials and the underlying principles of organic solar cells. I will show that â‘ the charge carrier mobility of organic semiconductors in the active layer of polymer solar cells has a rather small influence on the power conversion efficiency. Cooling solar cells of the polymer:fullerene blend PTB7:PC71BM from room temperature to 77 K decreased the hole mobility by a factor of thousand but the device efficiency only halved. â‘¡Subphthalocyanine molecules, which are commonly used as electron donor materials in vacuum-deposited active layers of organic solar cells, can, by a slight structural modification, also be used as efficient electron acceptor materials in solution-deposited active layers. These acceptors offer, compared to standard fullerene acceptors, advantages of a stronger light absorption at the peak of the solar spectrum. â‘¢A low band-gap polymer donor material requires a careful selection of the acceptor material in order to achieve efficient charge separation and a maximum open circuit voltage. â‘£The use of a processing additive in the casting solution for the active layer of organic solar cells of PTB7:PC71BM strongly influences the morphology, which leads not only to an optimum of charge separation but also to optimal charge collection.
On: July 9, 2015 From: 13h00 To: 14h00View talk
Speaker: Prof Bart Jan Ravoo (University of Muenster)
Selfâ€assembly is emerging as a superior method to prepare adaptive and responsive nanomaterials. Responsive multivalent interactions are key to such versatile materials. This lecture will highlight soft material composed of cyclodextrins and/or superparamagnetic nanoparticles. It will be shown that using the hostâ€guest chemistry of cyclodextrins, we can form hydrogels as well as nanocapsules. We can also make “magnetic vesicles” that selfâ€assemble in microscale linear aggregates in aqueoussolution under the influence of a magnetic field. The metastable linear aggregates can be stabilized by a noncovalent and photoresponsive crossâ€linker, which can be photoisomerized between an adhesive and a nonadhesive configuration. Thus, the hybrid material responds to magnetic field as well as to light and a stable selfâ€assembled structure can only be obtained in a magnetic field in the presence of the noncovalent crossâ€linker. We have recently extended this strategy to superparamagnetic nanoparticles modified with cyclodextrin. These hybrid nanoparticles can befurther functionalized using host guest interaction and molecular recognition and they can be used to capture and isolate proteins.
References:1. A. Samanta, B. J. Ravoo, Angew. Chem. Int. Ed. 2014, 53, 12946–12950.2. S. Himmelein, V. Lewe, M. C. A. Stuart, B. J. Ravoo, Chem. Sci. 2014, 5, 1054â€1058.3. J. H. Schenkel, A. Samanta, B. J. Ravoo, Adv. Mater. 2014, 26, 1076–1080.
On: August 24, 2015 From: 15h30 To: 16h30View talk
Speaker: Prof Osamu Ishitani (Tokyo Institute of Technology)
Both the problems of the global warming and shortage of the fossil fuels have brought about great interest in photochemical utilization of CO2 with solar energy. Efficient photocatalysts for CO2 reduction must be necessary for development of such an important technology.
We have developed novel types of photocatalytic systems using metal complexes and/or semiconductors as a photocatalyst.1 In this presentation, I will focus on the architecture of two types of the photocatalysts using transition metal complexes:
(1) A mixed photocatalytic system including a ring-shaped Re(I) multinuclear complex as a photosensitizer2
(2) Ru(II)-Re(I) and Ru(II)-Re(I) supramolecular photocatalysts.3
The efficiency of the former photocatalytic system has been highest in the reported CO2-reduction photocatalysts (ï† = 82%), and the latter photocatalysts have been most robust (TON > 3000).
On: September 11, 2015 From: 15h30 To: 16h30View talk