Clock News

A Blog Around The Clock

Category archives for Clock News

The Scientist special topic: Sleep

Nice four articles: The Gears of the Sleep Clock By Allan Pack: When people have trouble sleeping–such as, in extreme cases, shift workers–those problems are not always rooted in disturbances in circadian rhythm, argues the University of Pennsylvania’s ALLAN PACK. Instead, his studies of sleep have shown that the master clock is only one player…

Clocking Cancer

Les Lang at the UNC Medical Center News Office now writes a blog – Hard Science. One recent post immediately caught my eye – Clocking Cancer: You might say that Dr. Aziz Sancar is trying to clock cancer. In a nifty double play involving a pair of recent publications in the Proceedings of the National…

Clock News

Chemotherapy Most Effective At Time Of Day When Particular Enzyme At Lowest Level: For years, research has hinted that the time of day that cancer patients receive chemotherapy can impact their chances of survival. But the lack of a clear scientific explanation for this finding has kept clinicians from considering timing as a factor in…

Clock News

Two very interesting papers this week: The Circadian Clock in Arabidopsis Roots Is a Simplified Slave Version of the Clock in Shoots: The circadian oscillator in eukaryotes consists of several interlocking feedback loops through which the expression of clock genes is controlled. It is generally assumed that all plant cells contain essentially identical and cell-autonomous…

Clocks and Immunity

This EurekAlert title got my attention this morning: Immunity stronger at night than during day: The immune system’s battle against invading bacteria reaches its peak activity at night and is lowest during the day. Experiments with the laboratory model organism, Drosophila melanogaster, reveal that the specific immune response known as phagocytosis oscillates with the body’s…

Light Pollution

There is a nice article in this month’s National Geographic about Light Pollution. Unlike most popular articles on the topic which focus on the visibility of stars – an aesthetic problem – this article focuses on the effect of continuous light on animals and humans: We’ve lit up the night as if it were an…

Related to this discussion, there is a new interesting study out – Daily rhythms in blood vessels may explain morning peak in heart attacks: It’s not just the stress of going to work. Daily rhythms in the activity of cells that line blood vessels may help explain why heart attacks and strokes occur most often…

Totally cool: Phase Coupling of a Circadian Neuropeptide With Rest/Activity Rhythms Detected Using a Membrane-Tethered Spider Toxin: The regulation of the daily fluctuations that characterize an organism’s physiology and behavior requires coordination of the cellular oscillations of individual “clock” neurons within the circadian control network. Clock neurons that secrete a neuropeptide called pigment dispersing factor…

If you live in (most places in) the United States as well as many other countries, you have reset your clocks back by one hour last night (or last week). How will that affect you and other people? One possibility is that you are less likely to suffer a heart attack tomorrow morning than on…

In today’s PLoS Computation Biology: Circadian rhythm is universally present from unicellular organisms to complex organisms and plays an important role in physiological processes such as the sleep-wake cycle in mammals. The mammalian circadian rhythm presents an excellent system for studying gene regulatory networks as a large number of genes are undergoing circadian oscillation in…