Related topics: plants · circadian rhythms

Researchers clock DNA's recovery time after chemotherapy

In the time it takes for an Amazon Prime delivery to arrive, cells damaged by chemotherapy can almost completely fix their most important DNA. That is the case in the livers of mice at least, according to a new study.

'Fishing a line' coupled with clockwork for daily rhythm

Organisms on this planet, including human beings, exhibit a biological rhythm that repeats about every 24 hours to adapt to the daily environmental alteration caused by the rotation of the earth. This circadian rhythm is ...

In mice, feeding time influences the liver's biological clock

The timing of food intake is a major factor driving the rhythmic expression of most genes in the mouse liver, researchers report April 16th in the journal Cell Reports. The findings demonstrate that body-wide signals driven ...

Understanding circadian rhythms in algae and fungi

Fungi, algae, and cyanobacteria might not complain about jet lag. But like humans, their physiologies adhere to a roughly 24-hour cycle of behavioral patterns in the absence of external cues. Organisms that experience recurring ...

Cells decide when to divide based on their internal clocks

Cells replicate by dividing, but scientists still don't know exactly how they decide when to split. Deciding the right time and the right size to divide is critical for cells – if something goes wrong it can have a big ...

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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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