Medications

Common supplement SAMe could be toxic, scientists warn

A dietary supplement sold over the counter could be toxic and should not be used until it is shown to be safe, biologists from the Universities of Manchester and Kyoto have discovered.

Health

Why permanent daylight saving time is a bad idea

When Senators Marco Rubio of Florida and Edward Markey of Massachusetts introduced the bipartisan Sunshine Protection Act earlier this month, they rattled off a long list of reasons for making daylight saving time (DST) permanent.

Health

As clocks spring forward, keep sleep on track

You may only worry about losing an hour of sleep when the clocks spring forward this Sunday, but the time change can also be dangerous for your health, an expert says.

Diseases, Conditions, Syndromes

Diseased male livers undergo sex change

The livers of men diagnosed with hepatic diseases change sex as part of a potential self-protective mechanism, according to University of Queensland research.

Diseases, Conditions, Syndromes

Time of day matters in antibody response to COVID-19 vaccine

Our internal 24-hour circadian clock regulates many aspects of physiology, including the response to infectious disease and vaccination. A new study published in the Journal of Biological Rhythms demonstrates that antibody ...

Neuroscience

Disrupted circadian regulation of cognition in Alzheimer's disease

Circadian dysfunction linked to Alzheimer's disease is known to disrupt sleep and daily activity patterns. New research in a mouse model of the disease suggests beta-amyloid buildup in the brain, one of the hallmarks of Alzheimer's ...

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Circadian rhythm

A circadian rhythm is a roughly-24-hour cycle in the biochemical, physiological or behavioral processes of living entities, including plants, animals, fungi and cyanobacteria (see bacterial circadian rhythms). The term "circadian", coined by Franz Halberg, comes from the Latin circa, "around," and diem or dies, "day", meaning literally "approximately one day." The formal study of biological temporal rhythms such as daily, tidal, weekly, seasonal, and annual rhythms, is called chronobiology.

Circadian rhythms are endogenously generated, and can be entrained by external cues, called Zeitgebers, the primary one of which is daylight. These rhythms allow organisms to anticipate and prepare for precise and regular environmental changes.

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