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https://www.readbyqxmd.com/read/29106303/dynamics-of-core-body-temperature-cycles-in-long-term-measurements-under-real-life-conditions-in-women
#1
D Ekhart, H Wicht, T Kersken, H Ackermann, M Kaczmarczyk, G Pretzsch, H Alexander, H W Korf
Studies under real life conditions become more and more relevant in chronobiological and chronomedical research. The present study aims to analyze one of the most prominent biological rhythms: the core body temperature (CBT) rhythm in the real world outside the laboratory. CBT was recorded continuously in 37 healthy women (age between 21 and 44 years, median 29 years) with a newly developed intravaginal temperature sensor for up to 102 days. Sleep logs were available from 23 participants. To quantify the daily dynamics of each individual CBT-curve, novel measurement parameters are introduced which permit the quantification of the phase and shape of the CBT rhythms as well as their relation to the sleep-wake cycle...
November 6, 2017: Chronobiology International
https://www.readbyqxmd.com/read/29097992/circadian-and-metabolic-effects-of-light-implications-in-weight-homeostasis-and-health
#2
REVIEW
Santiago A Plano, Leandro P Casiraghi, Paula García Moro, Natalia Paladino, Diego A Golombek, Juan J Chiesa
Daily interactions between the hypothalamic circadian clock at the suprachiasmatic nucleus (SCN) and peripheral circadian oscillators regulate physiology and metabolism to set temporal variations in homeostatic regulation. Phase coherence of these circadian oscillators is achieved by the entrainment of the SCN to the environmental 24-h light:dark (LD) cycle, coupled through downstream neural, neuroendocrine, and autonomic outputs. The SCN coordinate activity and feeding rhythms, thus setting the timing of food intake, energy expenditure, thermogenesis, and active and basal metabolism...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/29072179/the-role-of-chronobiology-as-transdisciplinary-field-of-research-application-to-psychiatry
#3
Okan Çalıyurt
Chronobiology is a field that studies the effects of time on biological systems. Periodicity is of particular interest. The master biological clock in the suprachiasmatic nucleus controls daily rhythms of core body temperature, rest-activity cycle, physiological and behavioral functions, psychomotor functions and mood in humans. The clock genes are involved in the generation of the circadian rhythms and the biological clock is synchronized to solar day by direct photic inputs. Various circadian rhythm abnormalities have been demonstrated in mood disorders such as unipolar depression, bipolar depression and seasonal affective disorder...
October 26, 2017: Balkan Medical Journal
https://www.readbyqxmd.com/read/29070429/decrease-in-chronobiological-adaptability
#4
Jürgen Bickhardt
No abstract text is available yet for this article.
October 6, 2017: Deutsches Ärzteblatt International
https://www.readbyqxmd.com/read/29069527/chronobiology-comes-of-age
#5
EDITORIAL
A Wirz-Justice
No abstract text is available yet for this article.
October 25, 2017: Acta Psychiatrica Scandinavica
https://www.readbyqxmd.com/read/29066952/the-sleep-wake-cycle-in-the-nicotinic-alpha-9-acetylcholine-receptor-subunit-knock-out-mice
#6
Natalia Madrid-López, Jorge Estrada, Javier Díaz, Alejandro Bassi, Paul H Délano, Adrián Ocampo-Garcés
There is a neural matrix controlling the sleep-wake cycle (SWC) embedded within high ranking integrative mechanisms in the central nervous system. Nicotinic alpha-9 acetylcholine receptor subunit (alpha-9 nAChR) participate in physiological processes occurring in sensory, endocrine and immune systems. There is a relationship between the SWC architecture, body homeostasis and sensory afferents so that disruption of afferent signaling is expected to affect the temporal organization of sleep and wake states. The analysis of the SWC of 9 nAChR knock-out animals may help to reveal the contribution of alpha-9 nAChR to sleep chronobiological determinants...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/29039812/molecular-aspects-of-circadian-pharmacology-and-relevance-for-cancer-chronotherapy
#7
REVIEW
Narin Ozturk, Dilek Ozturk, Ibrahim Halil Kavakli, Alper Okyar
The circadian timing system (CTS) controls various biological functions in mammals including xenobiotic metabolism and detoxification, immune functions, cell cycle events, apoptosis and angiogenesis. Although the importance of the CTS is well known in the pharmacology of drugs, it is less appreciated at the clinical level. Genome-wide studies highlighted that the majority of drug target genes are controlled by CTS. This suggests that chronotherapeutic approaches should be taken for many drugs to enhance their effectiveness...
October 17, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29038118/introduction-to-chronobiology
#8
Sandra J Kuhlman, L Michon Craig, Jeanne F Duffy
A diverse range of species, from cyanobacteria to humans, evolved endogenous biological clocks that allow for the anticipation of daily variations in light and temperature. The ability to anticipate regular environmental rhythms promotes optimal performance and survival. Herein we present a brief historical timeline of how circadian concepts and terminology have emerged since the early observation of daily leaf movement in plants made by an astronomer in the 1700s.
October 16, 2017: Cold Spring Harbor Perspectives in Biology
https://www.readbyqxmd.com/read/29020114/how-annual-course-of-photoperiod-shapes-seasonal-behavior-of-diploid-and-triploid-oysters-crassostrea-gigas
#9
Laura Payton, Mohamedou Sow, Jean-Charles Massabuau, Pierre Ciret, Damien Tran
In this work, we study if ploidy (i.e. number of copies of chromosomes) in the oyster Crassostrea gigas may introduce differences in behavior and in its synchronization by the annual photoperiod. To answer to the question about the effect of the seasonal course of the photoperiod on the behavior of C. gigas according to its ploidy, we quantified valve activity by HFNI valvometry in situ for 1 year in both diploid and triploid oysters. Chronobiological analyses of daily, tidal and lunar rhythms were performed according the annual change of the photoperiod...
2017: PloS One
https://www.readbyqxmd.com/read/28993500/keeping-time-without-a-spine-what-can-the-insect-clock-teach-us-about-seasonal-adaptation
#10
REVIEW
David L Denlinger, Daniel A Hahn, Christine Merlin, Christina M Holzapfel, William E Bradshaw
Seasonal change in daylength (photoperiod) is widely used by insects to regulate temporal patterns of development and behaviour, including the timing of diapause (dormancy) and migration. Flexibility of the photoperiodic response is critical for rapid shifts to new hosts, survival in the face of global climate change and to reproductive isolation. At the same time, the daily circadian clock is also essential for development, diapause and multiple behaviours, including correct flight orientation during long-distance migration...
November 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28993499/time-is-honey-circadian-clocks-of-bees-and-flowers-and-how-their-interactions-may-influence-ecological-communities
#11
REVIEW
Guy Bloch, Noam Bar-Shai, Yotam Cytter, Rachel Green
The interactions between flowering plants and insect pollinators shape ecological communities and provide one of the best examples of coevolution. Although these interactions have received much attention in both ecology and evolution, their temporal aspects are little explored. Here we review studies on the circadian organization of pollination-related traits in bees and flowers. Research, mostly with the honeybee, Apis mellifera, has implicated the circadian clock in key aspects of their foraging for flower rewards...
November 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28993498/flexible-clock-systems-adjusting-the-temporal-programme
#12
REVIEW
Daan R van der Veen, Sjaak J Riede, Paul D Heideman, Michaela Hau, Vincent van der Vinne, Roelof A Hut
Under natural conditions, many aspects of the abiotic and biotic environment vary with time of day, season or even era, while these conditions are typically kept constant in laboratory settings. The timing information contained within the environment serves as critical timing cues for the internal biological timing system, but how this system drives daily rhythms in behaviour and physiology may also depend on the internal state of the animal. The disparity between timing of these cues in natural and laboratory conditions can result in substantial differences in the scheduling of behaviour and physiology under these conditions...
November 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28993497/marine-biorhythms-bridging-chronobiology-and-ecology
#13
Martin Bulla, Thomas Oudman, Allert I Bijleveld, Theunis Piersma, Charalambos P Kyriacou
Marine organisms adapt to complex temporal environments that include daily, tidal, semi-lunar, lunar and seasonal cycles. However, our understanding of marine biological rhythms and their underlying molecular basis is mainly confined to a few model organisms in rather simplistic laboratory settings. Here, we use new empirical data and recent examples of marine biorhythms to highlight how field ecologists and laboratory chronobiologists can complement each other's efforts. First, with continuous tracking of intertidal shorebirds in the field, we reveal individual differences in tidal and circadian foraging rhythms...
November 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28993496/timing-avian-long-distance-migration-from-internal-clock-mechanisms-to-global-flights
#14
REVIEW
Susanne Åkesson, Mihaela Ilieva, Julia Karagicheva, Eldar Rakhimberdiev, Barbara Tomotani, Barbara Helm
Migratory birds regularly perform impressive long-distance flights, which are timed relative to the anticipated environmental resources at destination areas that can be several thousand kilometres away. Timely migration requires diverse strategies and adaptations that involve an intricate interplay between internal clock mechanisms and environmental conditions across the annual cycle. Here we review what challenges birds face during long migrations to keep track of time as they exploit geographically distant resources that may vary in availability and predictability, and summarize the clock mechanisms that enable them to succeed...
November 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28993495/sleep-research-goes-wild-new-methods-and-approaches-to-investigate-the-ecology-evolution-and-functions-of-sleep
#15
REVIEW
Niels C Rattenborg, Horacio O de la Iglesia, Bart Kempenaers, John A Lesku, Peter Meerlo, Madeleine F Scriba
Despite being a prominent aspect of animal life, sleep and its functions remain poorly understood. As with any biological process, the functions of sleep can only be fully understood when examined in the ecological context in which they evolved. Owing to technological constraints, until recently, sleep has primarily been examined in the artificial laboratory environment. However, new tools are enabling researchers to study sleep behaviour and neurophysiology in the wild. Here, we summarize the various methods that have enabled sleep researchers to go wild, their strengths and weaknesses, and the discoveries resulting from these first steps outside the laboratory...
November 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28993494/seasonal-reproductive-tactics-annual-timing-and-the-capital-to-income-breeder-continuum
#16
REVIEW
Cory T Williams, Marcel Klaassen, Brian M Barnes, C Loren Buck, Walter Arnold, Sylvain Giroud, Sebastian G Vetter, Thomas Ruf
Tactics of resource use for reproduction are an important feature of life-history strategies. A distinction is made between 'capital' breeders, which finance reproduction using stored energy, and 'income' breeders, which pay for reproduction using concurrent energy intake. In reality, vertebrates use a continuum of capital-to-income tactics, and, for many species, the allocation of capital towards reproduction is a plastic trait. Here, we review how trophic interactions and the timing of life-history events are influenced by tactics of resource use in birds and mammals...
November 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28993493/timing-as-a-sexually-selected-trait-the-right-mate-at-the-right-moment
#17
REVIEW
Michaela Hau, Davide Dominoni, Stefania Casagrande, C Loren Buck, Gabriela Wagner, David Hazlerigg, Timothy Greives, Roelof A Hut
Sexual selection favours the expression of traits in one sex that attract members of the opposite sex for mating. The nature of sexually selected traits such as vocalization, colour and ornamentation, their fitness benefits as well as their costs have received ample attention in field and laboratory studies. However, sexually selected traits may not always be expressed: coloration and ornaments often follow a seasonal pattern and behaviours may be displayed only at specific times of the day. Despite the widely recognized differences in the daily and seasonal timing of traits and their consequences for reproductive success, the actions of sexual selection on the temporal organization of traits has received only scant attention...
November 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28993492/chronobiology-of-interspecific-interactions-in-a-changing-world
#18
REVIEW
Noga Kronfeld-Schor, Marcel E Visser, Lucia Salis, Jan A van Gils
Animals should time activities, such as foraging, migration and reproduction, as well as seasonal physiological adaptation, in a way that maximizes fitness. The fitness outcome of such activities depends largely on their interspecific interactions; the temporal overlap with other species determines when they should be active in order to maximize their encounters with food and to minimize their encounters with predators, competitors and parasites. To cope with the constantly changing, but predictable structure of the environment, organisms have evolved internal biological clocks, which are synchronized mainly by light, the most predictable and reliable environmental cue (but which can be masked by other variables), which enable them to anticipate and prepare for predicted changes in the timing of the species they interact with, on top of responding to them directly...
November 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28993491/methods-in-field-chronobiology
#19
REVIEW
Davide M Dominoni, Susanne Åkesson, Raymond Klaassen, Kamiel Spoelstra, Martin Bulla
Chronobiological research has seen a continuous development of novel approaches and techniques to measure rhythmicity at different levels of biological organization from locomotor activity (e.g. migratory restlessness) to physiology (e.g. temperature and hormone rhythms, and relatively recently also in genes, proteins and metabolites). However, the methodological advancements in this field have been mostly and sometimes exclusively used only in indoor laboratory settings. In parallel, there has been an unprecedented and rapid improvement in our ability to track animals and their behaviour in the wild...
November 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28993490/two-sides-of-a-coin-ecological-and-chronobiological-perspectives-of-timing-in-the-wild
#20
REVIEW
Barbara Helm, Marcel E Visser, William Schwartz, Noga Kronfeld-Schor, Menno Gerkema, Theunis Piersma, Guy Bloch
Most processes within organisms, and most interactions between organisms and their environment, have distinct time profiles. The temporal coordination of such processes is crucial across levels of biological organization, but disciplines differ widely in their approaches to study timing. Such differences are accentuated between ecologists, who are centrally concerned with a holistic view of an organism in relation to its external environment, and chronobiologists, who emphasize internal timekeeping within an organism and the mechanisms of its adjustment to the environment...
November 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
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