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The study of the effects of time and rhythmical phenomena on life processes.

chron′o·bi·o·log′ic (-ə-lŏj′ĭk), chron′o·bi·o·log′i·cal (-ĭ-kəl) adj.
chron′o·bi·o·log′i·cal·ly adv.
chron′o·bi·ol′o·gist n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˌkrɒnəbaɪˈɒlədʒɪ; ˌkrəʊnə-)
(Biology) the branch of biology concerned with the periodicity occurring in living organisms. See also biological clock, circadian
ˌchronobiˈologist n
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌkrɒn oʊ baɪˈɒl ə dʒi)

the science or study of the effect of time, esp. rhythms, on living systems.
chron`o•bi`o•log′i•cal (-əˈlɒdʒ ɪ kəl) adj.
chron`o•bi•ol′o•gist, n.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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"They got 16 per cent more sleep, almost a full night's length over the course of the week," said Till Roenneberg, a chronobiologist at Ludwig-Maximilian University in Munich, who headed the study.
There have been a couple of experiments: A chronobiologist did an experiment with a German industrial company where he allowed people to configure their day based on their chronotypes and, not surprisingly, satisfaction and productivity went up.
Chronobiologist Thomas Kantermann tells DW why daylight saving should be abolished.
There's a clock in the spleen," says Barbara Helm, a chronobiologist at the University of Glasgow in Scotland.
"Our surveys suggest that in Western societies two thirds of the population are burdened with a significant discrepancy between their internal time and the demands imposed by school and work schedules and leisure stress," said LMU chronobiologist Professor Till Roenneberg, who coined the term "social jetlag" to describe the phenomenon.
"Sleep is controlled by your internal body clock and also by your sleep homeostat, which is like an egg timer you flip over in the morning, allowing sleepiness to build up gradually through the day," says chronobiologist Dr Victoria Revell.
In a separate special session, Debra Skene, a Chronobiologist from the University of Surrey, referred to the association between "light at night" and cancer as "possible, though unproven".
Dr Victoria Revell, a chronobiologist at the University of Surrey, said: "Light is critical for synchronising our internal body clock, that drives daily rhythms in our behaviour.
It wasn't until 1999 that Harvard chronobiologist Charles Czeisler advanced beyond the approximate and accurately measured the day at 24 hours and 11 minutes.
Because of the effect on melatonin production and the link to breast cancer, Abraham Haim, a University of Haifa chronobiologist who took part in this study, questions the safety of banning conventional incandescent light bulbs and moving to fluorescent bulbs to save energy.
Ekirch quotes a chronobiologist as saying, "Every time we turn on a light we are inadvertently taking a drug that affects how we will sleep." It occurs to me that if I hadn't polluted my evenings in solitude with many hours of propane light, I might have reverted more completely to the segmented pattern.