Results 51 to 60 of about 1,183 (121)

Advanced circular statistics in biology: Multiple factors, interactions and repeated measures

Methods in Ecology and Evolution, Volume 17, Issue 3, Page 778-789, March 2026.
Abstract Circular data is common across biology and the wider sciences, but presents unique analytical challenges due to their wrapped structure, where endpoints coincide (e.g. 360° = 0°). This requires the use of specific statistical methods. Traditional tests like the Rayleigh and Watson U2 tests remain widely used, but lack flexibility in handling ...
Lukas Landler, Graeme D. Ruxton, E. Pascal Malkemper   +2 more
wiley   +1 more source

Chronobiology and Mood Disorders [PDF]

Psikiyatride Güncel Yaklaşımlar, 2011
Living organizms show cyclic rhythmicity in a variety of physiological, hormonal, behavioral, and psychological processes. Sleep-wake cycles, body temperature, hormone levels, mood and cognition display a circadian rhythm in humans.
Yavuz Selvi, Lutfullah Besiroglu, Adem Aydin   +2 more
doaj  

Imaging Multidimensional Therapeutically Relevant Circadian Relationships

International Journal of Biomedical Imaging, 2009
Circadian clocks gate cellular proliferation and, thereby, therapeutically target availability within proliferative pathways. This temporal coordination occurs within both cancerous and noncancerous proliferating tissues.
Jamil Singletary, Patricia A. Wood, Jovelyn Du-Quiton, Song Wang, Xiaoming Yang, Shobhit Vishnoi, William J. M. Hrushesky   +6 more
doaj   +1 more source

The Impact of Lunar Phases During Day and Night Cycles on Perinatal Outcomes: A Nationwide Cohort Study

Birth, Volume 53, Issue 1, Page 192-200, March 2026.
ABSTRACT Background Light changes during the lunar cycle affect rhythms in diverse species. Human studies focusing on whether the moon influences human health have so far neglected the effects of light/dark cycles. The purpose of this study was to investigate whether lunar phases impact perinatal outcomes by considering illumination levels due to day ...
Karin Windsperger, Tim Dorittke, Dana A. Muin, Herbert Kiss, Wilhelm Oberaigner, Hermann Leitner, Alex Farr   +6 more
wiley   +1 more source

Afternoon to early evening bright light exposure reduces later melatonin production in adolescents

npj Biological Timing and Sleep
Whether light exposure during the day reduces non-visual light effects later in the evening has not been studied in adolescents. We investigate whether afternoon-early evening (AEE) light interventions (130 lx, 2500 lx, 4.5 h, compared to 6.5 lx ...
Rafael Lazar, Fatemeh Fazlali, Marine Dourte, Christian Epple, Oliver Stefani, Manuel Spitschan, Christian Cajochen   +6 more
doaj   +1 more source

Impact of peripheral circadian misalignment and alcohol on the resiliency of intestinal barrier and microbiota

Gut Microbes
Circadian organization is involved in many gastrointestinal tract (GIT) functions such as the maintenance of intestinal barrier integrity. There is compelling evidence that perturbation of the circadian clock decreases intestinal epithelial cells ...
Laura Tran, Maliha Shaikh, Phillip A. Engen, Ankur Naqib, Dulce M. Frausto, Vivian Ramirez, Malia Gasteier, Zlata Bogin, Kristi Lawrence, Lijuan Zhang, Shiwen Song, Stefan J. Green, Faraz Bishehsari, Christopher B. Forsyth, Ali Keshavarzian, Garth R. Swanson   +15 more
doaj   +1 more source

Coupling governs entrainment range of circadian clocks

Molecular Systems Biology, 2010
Circadian clocks are endogenous oscillators driving daily rhythms in physiology and behavior. Synchronization of these timers to environmental light–dark cycles (‘entrainment’) is crucial for an organism's fitness.
Ute Abraham, Adrián E Granada, Pål O Westermark, Markus Heine, Achim Kramer, Hanspeter Herzel   +5 more
doaj   +1 more source

Chrono-biology, Chrono-pharmacology, and Chrono-nutrition

Journal of Pharmacological Sciences, 2014
The circadian clock system in mammals drives many physiological processes including the daily rhythms of sleep–wake behavior, hormonal secretion, and metabolism.
Yu Tahara, Shigenobu Shibata
doaj   +1 more source

Waning light, waxing pain: The lunar cycle's association with migraine headache occurrence

Headache: The Journal of Head and Face Pain, Volume 66, Issue 3, Page 584-594, March 2026.
Plain Language Summary While migraine headaches can be hard to predict, some patients believe headaches are connected to the moon‘s phases. Our research showed that migraine attacks were 34% more likely to occur during the new moon than during the full moon.
Alexander Yoo, Brendan Keenan, Angeliki Vgontzas, Murray A. Mittleman, Suzanne M. Bertisch, Ron Anafi   +5 more
wiley   +1 more source

Pinopsin Regulates Melatonin Production and Daily Locomotor Activity: Functional Insights From Gene‐Edited Xenopus Tadpoles

Journal of Pineal Research, Volume 78, Issue 2, March 2026.
ABSTRACT Circadian rhythm alignment depends on environmental light detection via opsins. Pinopsin, originally identified in the pineal organ of birds and later in amphibian pineal complex and eyes, may play a role in this process, though its function has not been genetically tested.
Neda Heshami, Ricardo D. Romero, Flavio S. J. de Souza, Gabriel E. Bertolesi, Sarah McFarlane   +4 more
wiley   +1 more source