Related topics: circadian rhythms

'Doomsday Clock' stuck at 100 seconds to midnight

The "Doomsday Clock" illustrating the perils facing the planet and mankind will remain at 100 seconds to midnight this year amid the threats of the coronavirus pandemic, nuclear war and climate change.

Bacteria can tell the time

Humans have them, so do other animals and plants. Now research reveals that bacteria too have internal clocks that align with the 24-hour cycle of life on Earth.

Understanding the circadian clocks of individual cells

Two new studies led by UT Southwestern scientists outline how individual cells maintain their internal clocks, driven both through heritable and random means. These findings, published online May 1 in PNAS and May 27 in eLife, ...

The sun may have a dual personality, simulations suggest

Researchers at CU Boulder have discovered hints that humanity's favorite star may have a dual personality, with intriguing discrepancies in its magnetic fields that could hold clues to the sun's own "internal clock."

Our circadian clock sets the rhythm for our cells' powerhouses

Countless genetically controlled clocks keep time in different body parts, such as the liver, kidneys and heart. Among other things, they initiate metabolic processes, ensuring that these occur at the optimal time of day. ...

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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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