clock

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clock

(klŏk)
n.
1. An instrument other than a watch for measuring or indicating time, especially a mechanical or electronic device having a numbered dial and moving hands or a digital display.
2. A biological clock.
v. clocked, clocking, clocks
v.tr.
To register or record with a mechanical device: clocked the winds at 60 miles per hour.

clock′er n.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

CLOCK

A gene on chromosome 4q12 that encodes a ubiquitously expressed human homolog of the mouse clock gene, which forms a heterodimer with ARNTL and activates E-box element transcription of several circadian clock proteins (e.g., PER1 and PER2). CLOCK is highly expressed in the suprachiasmatic nucleus.

Molecular pathology
CLOCK-ARNTL double mutations in the PAS domains result in syngernistic desensitisation to high levels of CRY on repression of CLOCK-ARNTL transcriptional activity of PER1, disrupting circadian rhythmicity.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

clock

(klok)
A device for measuring time.

biological clock

1. An internal system in organisms that influences behavior in a rhythmic manner. Functions such as growth, feeding, secretion of hormones, the rate of drug action, the wake-sleep cycle, the menstrual cycle, and reproduction coincide with certain external events such as day and night, the tides, and the seasons. Biological clocks appear to be set by environmental conditions in some animals, but if these animals are isolated from their environment they continue to function according to the usual rhythm. A gradual change in environment does produce a gradual change in the timing of the biological clock. See: circadian; maladaptation to night work; zeitgeber
2. A colloquial term for the decrease in fertility that accompanies aging, particularly as women approach the age of 35.
Medical Dictionary, © 2009 Farlex and Partners

Patient discussion about clock

Q. How do you wake up in the morning if your narcolepsy is so severe you can't hear the alarm clock, phone ring? biggest problem is sleep paralysis, can't wake up. Late for work, everything, life is suffering because of severity. Have tried ritalin, natural supplements, hypnosis therapy, Provigal, antidepressants, nothing seems to work. Employer thinks it's an excuse, friends are irritated, I'm at my wits end. Life is spent sleeping more than awake.

A. Narcolepsy cannot yet be cured. But EDS and cataplexy, the most disabling symptoms of the disorder, can be controlled in most patients with drug treatment. Often the treatment regimen is modified as symptoms change. For decades, doctors have used central nervous system stimulants-amphetamines such as methylphenidate, dextroamphetamine, methamphetamine, and pemoline-to alleviate EDS and reduce the incidence of sleep attacks. For most patients these medications are generally quite effective at reducing daytime drowsiness and improving levels of alertness. However, they are associated with a wide array of undesirable side effects so their use must be carefully monitored. Common side effects include irritability and nervousness, shakiness, disturbances in heart rhythm, stomach upset, nighttime sleep disruption, and anorexia. For full article: http://www.ninds.nih.gov/disorders/narcolepsy/detail_narcolepsy.htm#120393201 Hope this helps.

More discussions about clock
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References in periodicals archive ?
Slightly fewer men than women wanted to turn back the clock. But a survey of 2,000 people found both sexes felt pressure to look good in their 40s due to social media.
BACK IN TIME FOR DINNER (BBC 2, Tuesday, 8pm) TOP chef Ken Hom makes an appearance to turn back the clock once more for the Robshaws and take the whole family back to the 1980s.
Hidden Pearl Productions' Turn Back the Clock is a quirky, comic revue featuring some of the more delicate and poignant songs and monologues of the 1940s English actress and comedienne Joyce Grenfall - one of the great female entertainers of the 20th century.
Dawson has now written letters to his victims, claiming he is sorry for his one-man crime spree and wishing he could turn back the clock. It is clear that Dawson failed to show the same remorse when he terrorised his targets, often attacking vulnerable lone females and robbing them of mobile phones or jewellery.
BAC BA K IN TIME FOR DINNER (BBC 2, Tuesday, 8pm) TOP chef Ken Hom makes an appearance to turn back the clock once more for the Robshaws and take the whole family back to the 1980s.
said Lebanon still faces what it described as foreign-backed groups seeking to turn back the clock.
"We are living a phase where the residues of [Syrian] hegemony are trying to turn back the clock," said Zahra, who went on to accuse the new cabinet of attempting to keep assassins of Rafic Hariri and the other martyrs free.
"If I could turn back the clock 18 months I would have done it then."
Empty nesters and senior couples in particular seem to be attempting to turn back the clock through the addition of nutritional supplements to their diets.
The parents said that they have no need of electricity at the cost of miseries of our children so the government should turn back the clock as soon as possible.
SHANE WARNE reckons Brett Lee can turn back the clock and strike fear into England when the Ashes get underway on Wednesday.
Mrs Swift said: "With the approach of my 60th birthday in April, I thought I can't turn back the clock, so I might as well shout it from the rooftops."