248 results found for chemistry

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The Hunt May Be Up 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 | 3 years ago | 654 views
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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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Fun with Light and Single Molecules 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 | 3 years ago | 464 views
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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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Electron Transfer Theory 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 | 3 years ago | 728 views
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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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Molecules Against Cancer 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 | 3 years ago | 466 views
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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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NMR in Biology, Chemistry and Medicine 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 | 3 years ago | 636 views
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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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How to Synthesize a Wide Variety 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 | 3 years ago | 572 views
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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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Catalysis at Surfaces 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 | 3 years ago | 621 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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Roles of the Ubiquitin System 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 | 3 years ago | 586 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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Structural Aspects of Protease Control 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 | 3 years ago | 547 views
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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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Towards Adaptive Chemistry 00:33:00

Towards Adaptive Chemistry

by Jean-Marie Lehn
Towards Adaptive Chemistry
for 18-22 and upwards,
Lectures | 18-22 and upwards | 3 years ago | 361 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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Aquaporin Water Channels 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 | 3 years ago | 719 views
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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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Seeing is Believing 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 | 3 years ago | 413 views
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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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