Results 291 to 300 of about 261,145 (320)
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World Journal of Urology, 2006
Do men have biological clocks that affect their hormone levels, fertility, and the genetic quality of their sperm? Women can no longer be viewed as solely responsible for age-related fertility and genetic problems. The effects of andropause and advanced paternal age on fertility and offspring are still under investigation. Further research is needed to
Sarah M, Lambert +2 more
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Do men have biological clocks that affect their hormone levels, fertility, and the genetic quality of their sperm? Women can no longer be viewed as solely responsible for age-related fertility and genetic problems. The effects of andropause and advanced paternal age on fertility and offspring are still under investigation. Further research is needed to
Sarah M, Lambert +2 more
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Current Gastroenterology Reports, 2006
The gastrointestinal tract displays biologic rhythms in basal gastric acid output, epithelial cell proliferation, gastrointestinal motility, and appetite regulation. Furthermore, the development of gastrointestinal complications after administration of aspirin and after chemo- and radiotherapy for metastatic colon cancer depends on the time of ...
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The gastrointestinal tract displays biologic rhythms in basal gastric acid output, epithelial cell proliferation, gastrointestinal motility, and appetite regulation. Furthermore, the development of gastrointestinal complications after administration of aspirin and after chemo- and radiotherapy for metastatic colon cancer depends on the time of ...
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On the nature of biological clocks?
Experientia, 1971Feststellung, dass schlafende Goldhamster einen hoheren ATP-Gehalt in Gehirn und Leber besitzen als wache Tiere und dass Zeitgeber, wie Licht und Temperatur, sowohl Zellviskositat als auch ATP-Niveau verandern.
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Phase locking of biological clocks
Journal of Mathematical Biology, 1982Radial isochron clocks (RICs) and their response to external signals and coupling with other RICs are studied. RICs are derived as phase approximations to self-sustained oscillators. Their response to single impulses (phase resetting) and to repetitive impulses is determined. This response may be harmonic or chaotic.
James P. Keener, F. C. Hoppensteadt
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Rheumatoid arthritis and the biological clock
Expert Review of Clinical Immunology, 2014Rheumatoid arthritis (RA) is an autoimmune disease of unknown cause and a chronic and progressive inflammatory disorder ensuing in genetically predisposed subjects, characterized by synovitis causing joint destruction, as well as inflammation in body organ systems, leading to anatomical alteration and functional disability.
Angelo De Cata +3 more
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The Biologic Clock: The Mitochondria?
Journal of the American Geriatrics Society, 1972ABSTRACT:The author suggests that the maximal life span of a given mammalian species is largely an expression of genetic control over the rate of oxygen utilization. The latter determines the rate of accumulation of mitochondrial damage produced by free radical reactions, the rate increasing with the rate of oxygen consumption, which ultimately causes ...
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Practice Nursing, 1996
Known by most as the ‘morning after pill’, emergency contraception can deter potential users who are confused about the time limit. Suzanne Everett and Juliet Johnson review this regimen.
Juliet Johnson Rgn +1 more
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Known by most as the ‘morning after pill’, emergency contraception can deter potential users who are confused about the time limit. Suzanne Everett and Juliet Johnson review this regimen.
Juliet Johnson Rgn +1 more
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Integration of Biological Clocks and Rhythms
Comprehensive Physiology, 2012AbstractAnimals, plants, and microorganisms exhibit numerous biological rhythms that are generated by numerous biological clocks. This article summarizes experimental data pertinent to the often‐ignored issue of integration of multiple rhythms. Five contexts of integration are discussed: (i) integration of circadian rhythms of multiple processes within
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A mathematical description of biological clocks
Biosystems, 1967Abstract The implications of a concise mathematical formulation of the effect of light pulses on circadian rhythms are presented and discussed. The description is based on a model originally proposed by Pittendrigh.
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Physics Today, 1975
A pendulum can be stopped by a single impulse of the right magnitude, delivered at the proper time; started again, its phase will have changed. A biological oscillation, although it is a vastly more complicated phenomenon, can likewise be arrested by a single stimulus of a definite strength delivered at the proper time.
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A pendulum can be stopped by a single impulse of the right magnitude, delivered at the proper time; started again, its phase will have changed. A biological oscillation, although it is a vastly more complicated phenomenon, can likewise be arrested by a single stimulus of a definite strength delivered at the proper time.
openaire +2 more sources