Senin, 02 Maret 2009
Developmental Biology of a Simple Organism by Richard Losick, April 2008 - Part 1: How Bacillus Subtilis Makes a Spore (28:57)
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 » More
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.
Part 2: New Research on Multicellularity (18:13)
Part 3: Stochasticity and Cell Fate (25:03)
For further information see: http://www.ascb.org/ibioseminars/Losick/Losick1.cfm
Sex and Smell: Molecular Biology of Pheromone Perception by Catherine Dulac - Part 1: Introduction: Genes and Chemosensory Detection (15:31)
Pheromones have evolved to signal the sex and the dominance status of animals and to promote social and mating rituals. In this lecture, I discuss the how pheromone sensing operates in mammals. I will discuss the molecular biology of the chemosensory receptors that are involved the first steps of pheromone sensing. At a higher level of complexity, I will discuss a distinct olfactory structure called the vomeronasal organ (VNO) and how it contributes to sex-specific behavioral responses.
For further information see: http://www.ascb.org/ibioseminars/Dulac/Dulac1.cfm
Part 2: Molecular Biology of Pheromone Perception (43:43)
Part 3: Sex-Specificity of Pheromone Responses (30:39)
dulac_powerpoint_pt1.pdf
Sex and Smell: Molecular Biology of Pheromone Perception (presentation slides)
We have discovered a new blog dedicated to LAB TUTORIALS!
http://labtutorials.org/
Labtutorials in Biology is a blog that provides step-by-step tutorials in molecular biology. Bálint L. Bálint, junior lecturer, is behind the whole concept and he’s been making videos and writing descriptions for weeks.
Minggu, 01 Maret 2009
Toco Toucan Tradeoff
A Toco Toucan at London Zoo.I was doing some reading about Toucans. I confess I was never this enthusiastic as a student but these days I seem to be finding everything interesting. Anyway, I came across this curious conservation paper: Conservation puzzle: Endangered hyacinth macaw depends on its nest predator for reproduction.
In the Pantanal wetlands of Central Brazil, the endangered hyacinth macaw (Anodorhynchus hyacinthinus), the largest psitacid in the world, makes its nest almost exclusively in natural hollows found in the manduvi tree (Sterculia apetala). The recruitment of manduvis greatly depends on the seed dispersal services provided by the toco toucan (Ramphastos toco), responsible for 83.3% of the seed dispersal. The toco toucan, however, is responsible for about 53% of the preyed eggs, resulting in a case of conflicting ecological pressures in which the reproduction of the hyacinth macaw is indirectly dependent on the seed dispersal services of its nest predator.
For New Yorkers: NON BIO SPECIFIC - The Secret Science Club Lectures
The Secret Science Club is a free science lecture and arts series. It is open to the public and meets the first Wednesday of every month in the basement of Union Hall in Park Slope, Brooklyn.
Find out more here: http://secretscienceclub.blogspot.com/
On Febuary 4th the club featured: Dr. Pieribone, A cellular and molecular biologist at Yale University’s School of Medicine and the co-author of Aglow in the Dark: The Revolutionary Science of Biofluorescence. Dr. Pieribone asked:
--What do jellyfish and coral reefs have to do with the human brain and quest for medical cures?
--What makes undersea animals glow?
--How can biofluorescent technology link the human mind with machines?
--What are the latest advances in fluorescent micro-photography?
--And whatever happened to that transgenic, glow-in-the-blacklight rabbit in France?
Walking Like a Modern Human
Well-documented fossilized 3.8 million-year-old footprints show that our early ancestors walked with a decidedly ape-like primitive gait, with bent knees, short steps, and a predominant point of impact on the heels. It may have taken several million more years of evolution before changes in our ancestors’ physical structure allowed them to walk with the long stride of modern humans. Recent analysis of 1.5 million-year-old footprints in Kenya indicates that the footprint-makers (most likely Homo erectus) had a long stride and the ability to push off with the big toe, as we do. The footprints also show that by 1.5 million years ago, foot anatomy was very much like ours.
UC BERKLEY General Biochemistry and Molecular Biology
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