Results 11 to 20 of about 968 (86)
Could photoperiodic responses have evolved before the emergence of circadian clocks? [PDF]
New PhytolSummary Plants use photoperiod (i.e. day length) as a seasonal cue for timing when to flower. This ability, known as photoperiodism, also underlies phenomena such as migration, seasonal reproduction, and hibernation in animals. Because a circadian (daily) clock underlies the day/night length timing mechanism in most organisms, it has been generally ...
Jabbur ML, Johnson CH.
europepmc +2 more sources
Digital Sleep Disruption: Unraveling the Network Structure of Technology Use and Sleep Problems Through Network Analysis. [PDF]
CNS Neurosci TherIn 9443 Chinese adults, network analysis reveals blue light exposure as the central factor most strongly associated with sleep problems (r = 0.31). General screen time shows minimal direct effects (r = 0.03), with sleep disruption mediated through evening‐specific behaviors.
Gan H, Xu L, Tong C.
europepmc +2 more sources
Twenty-Four Hour Rhythms in Cardiovascular Physiology. [PDF]
Acta Physiol (Oxf)ABSTRACT Many physiological parameters, such as heart rate and blood pressure, display pronounced daily rhythms, with significant differences between day and night levels. The ability to anticipate the 24 h cycle of ambient light confers an adaptive advantage, allowing organisms to prepare for periods of activity and rest.
Thomsen MB.
europepmc +2 more sources
Atlas-Based Mapping of Traditional Chinese Medicine Effects on Tumor Microcirculation Regulation. [PDF]
Immun Inflamm DisABSTRACT Background Tumor microcirculation plays a central role in the onset and progression of hypoxia, therapeutic resistance, and immune evasion within the tumor microenvironment. Traditional Chinese Medicine (TCM), characterized by its multi‐targeted and systemic regulatory properties, has garnered increasing attention for its potential to modulate
Ho I, Xie Y, Liu Z, Cai D.
europepmc +2 more sources
Explaining features of fine-grained phenomena using abstract analyses of phenomena and mechanisms: two examples from chronobiology [PDF]
Synthese, 2017 Explanations of biological phenomena such as cell division, protein synthesis or circadian rhythms commonly take the form of models of the responsible mechanisms. Recently philosophers of science have attempted to analyze this practice, presenting mechanisms as organized collections of parts performing operations that together produce the phenomenon ...
openaire +1 more source
Journal of Physiological Anthropology, 2012 Background The purpose of the present study was to compare sinusoidal versus constant lower body negative pressure (LBNP) with reference to very mild whole-body heating.
Ishibashi Keita +4 more
doaj +1 more source
Distribution of Chronotypes among a Sample of Iraqi Kurdish Medical Students
Sultan Qaboos University Medical Journal, 2014 Objectives: The aim of this study was to assess the distribution of chronotypes in a sample of Iraqi Kurdish medical students. Methods: A descriptive cross-sectional study was conducted at the Hawler Medical University College of Medicine in Erbil City ...
Awring M. Raoof +2 more
doaj +2 more sources
Nature and Science of Sleep, 2021 Mads Barloese1,2 1Department of Clinical Physiology and Nuclear Medicine, Center for Functional and Diagnostic Imaging, Hvidovre Hospital, Hvidovre, Denmark; 2Department of Neurology, Danish Headache Center, Rigshospitalet-Glostrup, Glostrup ...
Barloese M
doaj
Clinical and Experimental Hypertension, 2017 In clinical practice, circadian rhythms play a prominent role in pharmacokinetics and cell responses to therapy, hence necessitating in designing a defined protocol for drug administration.
Samira Khodadoustan +5 more
doaj +1 more source
Time after time – circadian clocks through the lens of oscillator theory
FEBS Letters, EarlyView.Oscillator theory bridges physics and circadian biology. Damped oscillators require external drivers, while limit cycles emerge from delayed feedback and nonlinearities. Coupling enables tissue‐level coherence, and entrainment aligns internal clocks with environmental cues.
Marta del Olmo +2 more
wiley +1 more source