clock

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clock

(klok) a device for measuring time.
biological clock  the physiologic mechanism which governs the rhythmic occurrence of certain biochemical, physiologic, and behavioral phenomena in living organisms.

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.

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.

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.

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
References in periodicals archive ?
This is the industry's first voice engine that enables to run a VoIP application on devices with CPU clock rate of 200 MHz or less, for example, Qtek 8310, iPAQ 6340, and the like.
The CF-51 does have the fastest CPU clock speed in its class, but the main reason for its superior overall system performance is the Panasonic engineering expertise that enabled us to rapidly Second Generation Centrino(TM) mobility platform and 533MHz FSB CPUs into our computers.
The family also features a vector floating-point coprocessor for full support of single-precision and double-precision calculations at CPU clock speeds, which is important for signal processing applications such as motor control.
Xolo's upcoming super smartphone is expected to pack a powerful Intel's 'Clover Trail+' chipset with CPU clock speed.
SPYRUS plans to migrate its security solution to Infineon's new PE family of secure microcontroller ICs to take advantage of enhanced features including more efficient EEPROM programming, 33MHz CPU clock, and smaller die size.
SPYRUS plans to migrate its security solution to Infineon's new 66PE family of secure microcontroller ICs to take advantage of enhanced features including more efficient EEPROM programming, 33MHz CPU clock, and smaller die size.
The ICS9FG1201 and ICS9FG1901 devices generate ICS99AMB048 clocks from an ICS932S401 CPU clock.
Opting for a 4U0 configuration allowed AMD to reduce Raven Ridge's die size, and the higher CPU clocks are intended to compensate for the smaller L3 cache.
Mobile CPU clocks run hundreds of MHz, and mobile 32 bit processors access gigabytes of memory.
For example, the 16-bit asynchronous event counter (AEC) can be used to count input pulse even when the CPU clocks are turned off.
This won't strictly be a comparison based on CPU clocks, either.