43 results found for chemistry

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00:33:00

Nanoscopy – allowing molecules to be examined inside living cells

by Eric Betzig
Nanoscopy – allowing molecules to be examined inside living cells
for 18-22 and upwards,
Lectures | 18-22 and upwards | 8 years ago | 2861 views
Rating:

Eric Betzig shared the 2014 Chemistry Nobel prize with fellow American William E. Moerner and Romanian-German Stefan W. Hell for revolutionising science through the development of super-resolved fluorescence to exceed the accepted limits of tradition....

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00:30:00

The Hunt May Be Up for the Carrier of the Diffuse Interstellar Bands and other stories

by Harry Kroto
The Hunt May Be Up for the Carrier of the Diffuse Interstellar Bands and other stories
for 18-22 and upwards,
Lectures | 18-22 and upwards | 8 years ago | 1409 views
Rating:

The development of radio telescopes has revolutionized our understanding of the molecular constitution of the interstellar medium ISM. A recent surprise that the element carbon had up its sleeve was the existence of C60, Buckminsterfullerene, the thi....

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00:32:00

Fun with Light and Single Molecules

by William Moerner
Fun with Light and Single Molecules
for 18-22 and upwards,
Lectures | 18-22 and upwards | 8 years ago | 1236 views
Rating:

More than 25 years ago, single molecules were first detected optically, but how do we really detect a single molecule today, and what good is it? It is an amazing fact that you can even detect single molecules with your own eyes. When a new regime of....

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00:29:00

Electron Transfer Theory in Single Molecule Studies of Intermittent Fluorescence of Quantum Dots and in Initial Steps in Dye Sensitized Solar Cells

by Rudolph Marcus
Electron Transfer Theory in Single Molecule Studies of Intermittent Fluorescence of Quantum Dots and in Initial Steps in Dye Sensitized Solar Cells
for 18-22 and upwards,
Lectures | 18-22 and upwards | 8 years ago | 1504 views
Rating:

Intermittently fluorescing single molecule systems are found in many materials, including semiconductor quantum dots (QD), dyes on crystalline or nanoparticle film surfaces, and biological systems. The QD's show a ~ -3/2 power law for the distributio....

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00:33:00

Molecules Against Cancer or for Long-Term Memory Storage

by Roger Tsien
Molecules Against Cancer or for Long-Term Memory Storage
for 18-22 and upwards,
Lectures | 18-22 and upwards | 8 years ago | 1188 views
Rating:

For cancer diagnosis and therapy, we are developing activatable cell penetrating peptides (ACPPs), synthetic molecules with a novel amplifying mechanism for homing to diseased tissues. ACPPs are polycationic cell penetrating peptides whose cellular u....

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00:26:00

NMR in Biology, Chemistry and Medicine

by Kurt Wurthrich
NMR in Biology, Chemistry and Medicine
for 18-22 and upwards,
Lectures | 18-22 and upwards | 8 years ago | 1649 views
Rating:

For the discovery of the physics phenomenon of nuclear magnetic resonance (NMR), Felix Bloch and Edward Purcell were awarded the Nobel Prize in Physics in 1952. NMR has then been used in a wide range of fundamental studies in physics, and in the 1960....

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00:35:00

How to Synthesize a Wide Variety of Optically Active Compounds with >99% Optical Purity

by Ei-ichi Negishi
How to Synthesize a Wide Variety of Optically Active Compounds with >99% Optical Purity
for 18-22 and upwards,
Lectures | 18-22 and upwards | 8 years ago | 1460 views
Rating:

The discovery and synthetic applications of a widely applicable and highly enantioselective (>99% ee) protocol consisting of the 'ZACA reaction' (Zr-catalyzed asymmetric carboalumination of alkenes), purification of the ZACA-products by lipase-cat....

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00:31:00

Catalysis at Surfaces: From Atoms to Complexity

by Gerhard Ertl
Catalysis at Surfaces: From Atoms to Complexity
for 18-22 and upwards,
Lectures | 18-22 and upwards | 8 years ago | 1254 views
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This lecture addresses the question if spatio-temporal self-organisation of matter which is so characteristic for living systems can also be verified with a simple inorganic reaction in which the observed phenomena of complexity can be traced back to....

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00:27:00

Roles of the Ubiquitin System in Health and Disease

by Avram Hershko
Roles of the Ubiquitin System in Health and Disease
for 18-22 and upwards,
Lectures | 18-22 and upwards | 8 years ago | 1299 views
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The selective degradation of many short-lived proteins in eukaryotic cells is carried out by the ubiquitin-mediated proteolytic system. In this pathway, proteins are targeted for degradation by covalent ligation to ubiquitin, a highly conserved small....

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00:31:00

Structural Aspects of Protease Control in Health and Disease

by Robert Huber
Structural Aspects of Protease Control in Health and Disease
for 18-22 and upwards,
Lectures | 18-22 and upwards | 8 years ago | 1297 views
Rating:

This lecture starts out with a very brief review of the history of protein crystallography and continue with our studies since 1970 on proteolytic enzymes and their control. Proteolytic enzymes catalyse a very simple chemical reaction, the hydrolytic....

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00:33:00

Towards Adaptive Chemistry

by Jean-Marie Lehn
Towards Adaptive Chemistry
for 18-22 and upwards,
Lectures | 18-22 and upwards | 8 years ago | 1332 views
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Molecular chemistry implementing reversible chemical bonds between atoms in molecules, as well as supramolecular chemistry, whose molecular components are held together by intermolecular interactions, are able to undergo a continuous change in consti....

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00:32:00

Aquaporin Water Channels – From Atomic Structure to Malaria

by Peter Agre
Aquaporin Water Channels – From Atomic Structure to Malaria
for 18-22 and upwards,
Lectures | 18-22 and upwards | 8 years ago | 2920 views
Rating:

Aquaporin channels allow water to rapidly cross cell membranes in all living organisms. AQP1 confers red cells and proximal renal tubules with high water permeability. Present in renal collecting duct, AQP2 is regulated by vasopressin, and human muta....

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00:31:00

Seeing is Believing – A Hundred Years of Visualizing Molecules

by Venkatraman Ramakrishnan
Seeing is Believing – A Hundred Years of Visualizing Molecules
for 18-22 and upwards,
Lectures | 18-22 and upwards | 8 years ago | 1206 views
Rating:

It has been a hundred years since molecules were first visualized directly by using x-ray crystallography. That gave us our first look at molecules as simple as common salt to one as complex as the ribosome that has almost a million atoms. In the las....

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00:34:00

The Dawn of the Fullerenes: A Research Adventure

by Robert Curl
The Dawn of the Fullerenes: A Research Adventure
for 18-22 and upwards,
Lectures | 18-22 and upwards | 9 years ago | 1605 views
Rating:

When he received the 1996 Nobel Prize in Chemistry together with Richard E. Smalley (who also worked at Rice) and Sir Harold Kroto (at the time at the University of Sussex, UK), this was a true example of national and international scientific collabo....

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00:32:00

C60-Buckminsterfullerene: Not just a Pretty Molecule

by Harry Kroto
C60-Buckminsterfullerene: Not just a Pretty Molecule
for 14-19 and upwards,
Lectures | 14-19 and upwards | 9 years ago | 1907 views
Rating:

Amongst the Nobel Laureates lecturing in Lindau, Sir Harold Kroto would probably earn the award for the most unusual and characteristic way of presenting. This lecture, which is the first he ever gave in Lindau, is no exception. Kroto`s way of presen....

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00:49:00

Dynamics of Chemical Reactions

by Yuan Lee
Dynamics of Chemical Reactions
for 18-22 and upwards,
Lectures | 18-22 and upwards | 9 years ago | 1260 views
Rating:

Every macroscopic chemical transformation, whether it is atmospheric ozone depletion or the burning of a candle, consists of millions of microscopic chemical events, which involve collisions between molecules.  It has been the dream of scientists fo....

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00:35:00

From Disorder to Order

by Gerhard Ertl
From Disorder to Order
for 18-22 and upwards,
Lectures | 18-22 and upwards | 9 years ago | 1196 views
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Our experience suggests that a system will usually show the tendency to undergo spontaneously a transition from the state of order into disorder.  Quite in contrast, our world developed from an initial state of great disorder into another one where ....

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00:39:00

Molecular Catalysis for Green Chemistry

by Ryoji Noyori
Molecular Catalysis for Green Chemistry
for 18-22 and upwards,
Lectures | 18-22 and upwards | 9 years ago | 1355 views
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Science is inevitably intertwined with society.  The state of the art of science, coupled with industrial endeavors, has determined our quality of life.  Chemists are proud of their ability to generate high value from almost nothing by using accumu....

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00:35:00

Designing Molecules and Nanoparticles to Help See and Treat Disease

by Roger Tsien
Designing Molecules and Nanoparticles to Help See and Treat Disease
for 18-22 and upwards,
Lectures | 18-22 and upwards | 9 years ago | 1232 views
Rating:

Molecules to observe and manipulate biological systems can be devised by a variety of strategies, ranging from pure chemical design and total synthesis to genome mining and high-throughput directed evolution. Examples of both successes and failures a....

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00:40:00

Why I love Microbes

by Richard Roberts
Why I love Microbes
for 18-22 and upwards,
Lectures | 18-22 and upwards | 9 years ago | 1530 views
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We live in a fascinating world surrounded by life. Much of that life is clearly visible like the plants and animals that we see every day. However, far more is invisible to the naked eye and it is to this realm, the microscopic world, that I will t....

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00:51:00

Why do we not have a vaccine against TB or HIV (yet)?

by Ralph Zinkernagel
Why do we not have a vaccine against TB or HIV (yet)?
for 18-22 and upwards,
Lectures | 18-22 and upwards | 9 years ago | 1204 views
Rating:

Survival of vertebrate hosts against infections depends on important natural or innate resistance mechanisms combined with adaptive immune responses of T and B cells. Infectious agents probe the limit of immune responses and help to characterize thr....

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00:46:00

Darwinian evolution as understood by scientists of the 21st century

by Werner Arber
Darwinian evolution as understood by scientists of the 21st century
for 18-22 and upwards,
Lectures | 18-22 and upwards | 9 years ago | 1801 views
Rating:

After a short reminder of the historical development of evolutionary biology, elements to a molecular theory of Darwinian evolution will be presented. Biological evolution is driven by the availability of genetic variants in populations. The occasi....

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00:38:00

Protein Crosstalk in Cell Signaling

by Edmond Fischer
Protein Crosstalk in Cell Signaling
for 18-22 and upwards,
Lectures | 18-22 and upwards | 9 years ago | 1402 views
Rating:

This talk concentrates on cellular regulation by tyrosine phosphorylation which has been directly implicated in cell growth, differentiation and transformation. Growth factor receptors transduce their signal by recruiting a multiplicity of adaptor p....

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00:12:00

The cell cycle and cancer

by Tim Hunt
The cell cycle and cancer
for 18-22 and upwards,
Lectures | 18-22 and upwards | 9 years ago | 2104 views
Rating:

It was in 1882 that Walther Flemming published drawings of chromosomes lining up in mitosis and parting equally to the daughters of cell division, and 20 years later that Theodor Boveri explained the significance of the chromosome dance in terms of t....

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