منابع مشابه
Circadian rhythms.
1997 marks the 25th anniversary of the discovery of the master circadian pacemaker in mammals in the hypothalamic suprachiasmatic nucleus. Remarkable progress has been made over the last 25 years in elucidating the physiological mechanisms involved in the entrainment, generation and expression of circadian rhythms at the cellular and systems levels. The recent discovery and cloning of the first...
متن کاملCircadian rhythms.
Circadian rhythms are a ubiquitous adaptation of eukaryotic organisms to the most reliable and predictable of environmental changes, the daily cycles of light and temperature. Prominent daily rhythms in behavior, physiology, hormone levels and biochemistry (including gene expression) are not merely responses to these environmental cycles, however, but embody the organism's ability to keep and t...
متن کاملThe survey of fluctuations of attention on circadian and weekly rhythms among high school students
Introduction: Human cognitive activities are affected by the time of doing homework, biologic rhythms and interaction among them. Method: this research accomplished to specify the fluctuation patterns of daily and weekly cycles of the students attention. The research method was correlation. The statistical population of this study were 45 female students in 11th grade from a high school in hu...
متن کاملOverview of circadian rhythms.
The daily light-dark cycle governs rhythmic changes in the behavior and/or physiology of most species. Studies have found that these changes are governed by a biological clock, which in mammals is located in two brain areas called the suprachiasmatic nuclei. The circadian cycles established by this clock occur throughout nature and have a period of approximately 24 hours. In addition, these cir...
متن کاملCircadian rhythms and reproduction.
There is a growing recognition that the circadian timing system, in particular recently discovered clock genes, plays a major role in a wide range of physiological systems. Microarray studies, for example, have shown that the expression of hundreds of genes changes many fold in the suprachiasmatic nucleus, liver heart and kidney. In this review, we discuss the role of circadian rhythmicity in t...
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ژورنال
عنوان ژورنال: Clinical Chemistry
سال: 1995
ISSN: 0009-9147,1530-8561
DOI: 10.1093/clinchem/41.2.326