Results 191 to 200 of about 170,034 (231)
Some of the next articles are maybe not open access.
The American Journal of Medicine, 1988
All forms of life, from the simplest cells to the most complex organisms, show periodicity in some of their biologic activities and functions. The most common of these rhythmic events are those that we refer to as "circadian" (circa, around; dias, day).
openaire +4 more sources
All forms of life, from the simplest cells to the most complex organisms, show periodicity in some of their biologic activities and functions. The most common of these rhythmic events are those that we refer to as "circadian" (circa, around; dias, day).
openaire +4 more sources
Identification of circadian rhythm
2016 24th Mediterranean Conference on Control and Automation (MED), 2016We present an identification algorithm for determining the variables characterizing a circadian rhythm. This method is based on a recursive least square algorithm combined with an appropriate observer. It has the advantage of determining all the parameters of a time-varying circadian rhythm without requiring the knowledge of the period.
Pigeon, Eric +7 more
openaire +5 more sources
2015
Due to the daily rotation of the Earth on its axis, nearly all organisms are exposed to daily cycles of environmental factors, including the intensity and quality of light, temperature, and other abiotic or physical factors, as well as changes in biotic factors such as presence of predators, competitors, and food.
Vincent M. Cassone, Vinod Kumar
openaire +2 more sources
Due to the daily rotation of the Earth on its axis, nearly all organisms are exposed to daily cycles of environmental factors, including the intensity and quality of light, temperature, and other abiotic or physical factors, as well as changes in biotic factors such as presence of predators, competitors, and food.
Vincent M. Cassone, Vinod Kumar
openaire +2 more sources
Melatonin and Circadian Rhythms
Current Topics in Medicinal Chemistry, 2002Melatonin synthesis and secretion by the pineal gland is under the control of the suprachiasmatic nucleus and consequently has a profound circadian rhythm. In this review we discuss some of the issues surrounding the measurement of melatonin rhythmicity in biological fluids and the factors that influence melatonin circadian rhythmicity, including light
Kennaway, D., Wright, H.
openaire +4 more sources
Circadian rhythms and circadian rhythm disorders in children and adolescents
Seminars in Pediatric Neurology, 2001A clinically applicable review of circadian rhythm physiology is presented, including a detailed examination of the interaction of circadian and homeostatic systems and the maturation of the circadian system from preconception through adolescence. Emphasis is placed on the clinical evaluation gathering information through the history, sleep log, and if
Mark W. Mahowald +2 more
openaire +3 more sources
Circadian Rhythms and Arthritis
Rheumatic Disease Clinics of North America, 2005The clinical symptoms of rheumatoid arthritis (RA) show a circadian variation; joint stiffness and pain are more prominent in the early morning. An altered functioning of the hypothalamic-pituitary-adrenal axis (cortisol) and of the pineal gland (melatonin) seems to be important factors in the perpetuation and clinical circadian symptoms of RA ...
Alfonse T. Masi, Maurizio Cutolo
openaire +3 more sources
Circadian rhythms in the fetus
Molecular and Cellular Endocrinology, 2012Throughout gestation, the close relationship between mothers and their progeny ensures adequate development and a successful transition to postnatal life. By living inside the maternal compartment, the fetus is inevitably exposed to rhythms of the maternal internal milieu such as temperature; rhythms originated by maternal food intake and maternal ...
Serón Ferré, María +9 more
openaire +4 more sources
Experimental Gerontology, 1991
The human biological clock or "circadian system" serves the function of preparing the body and mind for restful sleep at some times of day and active wakefulness at others. The observed circadian rhythms result from three interacting processes: endogenous rhythm generation mechanisms, entrainment mechanisms to keep these rhythms "on track," and ...
openaire +3 more sources
The human biological clock or "circadian system" serves the function of preparing the body and mind for restful sleep at some times of day and active wakefulness at others. The observed circadian rhythms result from three interacting processes: endogenous rhythm generation mechanisms, entrainment mechanisms to keep these rhythms "on track," and ...
openaire +3 more sources