Developmental Biology of a Simple Organism by Richard Losick, April 2008 - Part 1: How Bacillus Subtilis Makes a Spore (28:57)

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How do simple cells differentiate, assemble into communities, and cope with change? Losick's seminar addresses these questions in the spore-forming bacterium Bacillus subtilis. Part I is an overview of how B. subtilis makes a spore.

For further information see: http://www.ascb.org/ibioseminars/Losick/Losick1.cfm

The Origin of Vertebrates - Part 1: The Origin of the Vertebrate Nervous System: The Hemichordat

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Modern cell and developmental biology has a lot to contribute to our understanding of the deep history of animal origins, which until recently has been largely the province of paleontology. In this set of lectures, I hope to show how recent studies by a very small group of scientists on a virtually unknown phylum of marine organisms, the hemichordates, has helped explain some of the major mysteries of the origin of vertebrates. This is a tour of not only vertebrate origins but the...

What Genomes Can Tell Us About the Past by Sydney Brenner - Part 1: (39:06)

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By looking at the light from distant galaxies and having well-established calibration methods, astrophysics can make hypotheses about the history of our universe. Do we have similar "rulers" in biology that could allow us to reconstruct the remote past and the evolution of species on this planet? The answer is likely "yes" and the clues are undoubtedly contained in the many whole genome sequences that are now available for inspection. However, it is critical to evaluate the assumptions that...

The Problem of Regeneration - Part 1: A Brief (Natural) History of Regeneration (32:38)

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Regeneration has fascinated philosophers and scientists since the beginning of history. The wide but uneven distribution of regenerative capacities among multicellular organisms is puzzling, and the permissive/inhibitory mechanisms regulating this attribute in animals remain a mystery. In the first part of this lecture, I will provide a general history of regeneration research from ancient Greece to the beginning of the 20th century. Key concepts will be introduced in their appropriate...