Clock News

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To sleep or not to sleep: the ecology of sleep in artificial organisms: We systematically varied input parameters related to the number of food and sleep sites, the degree to which food and sleep sites overlap, and the rate at which food patches were depleted. Our results reveal that: (1) the costs of traveling between…

Oxytocin and Childbirth. Or not.

When teaching human or animal physiology, it is very easy to come up with examples of ubiqutous negative feedback loops. On the other hand, there are very few physiological processes that can serve as examples of positive feedback. These include opening of the ion channels during the action potential, the blood clotting cascade, emptying of…

As we mentioned just the other day, studying animal behavior is tough as “animals do whatever they darned please“. Thus, making sure that everything is controlled for in an experimental setup is of paramount importance. Furthermore, for the studies to be replicable in other labs, it is always a good idea for experimental setups to…

Two interesting papers came out last week [from the Archives - click on the clock logo to see the original post], both using transgenic mice to ask important questions about circadian organization in mammals. Interestingly, in both cases the gene inserted into the mouse was a human gene, though the method was different and the…

This post is a relatively recent (May 24, 2006) critique of a PLoS paper.

Fiona turns green and ogre-ish at night

‘Fiona’ Gene Controls Flower’s Physiologic Clock: Scientists have found a new gene that regulates the daily and yearly physiological cycles of flowering and seeding. POSTECH researchers, led by Nam Hong-gil and Kim Jeong-sik, said that they named the gene FIONA1 after the heroine in the popular animation “Shrek.” In the animation, princess Fiona is human…

I found two articles interesting to me in today’s issue of PLoS Computational Biology – the first one about becoming a good scientist, the other on circadian rhythms: On the Process of Becoming a Great Scientist: In the vein of promoting further debate and discussion, I provide here a different and perhaps deeper look at…

Floral Clock

Washington Post has an article on how to plant your own floral clock, just like the one built by Linnaeus.

It’s rare that an article combines my two interests – in biological clocks and politics. This one does: Circadian rhythms differ for the king and the president: One is a night owl who likes to do business after midnight. The other is an early-to-bed guy who brags about going to sleep around 9:30 p.m. Uh-oh.…

I had no time to read this in detail and write a really decent overview here, perhaps I will do it later, but for now, here are the links and key excerpts from a pair of exciting new papers in PLoS Biology and PLoS ONE, which describe the patterns of expression of a second type…