Circannual alterations in the circadian rhythm of melatonin secretion.

abstract：:Reduced sensitivity to short-wavelength (blue) light with age has been shown for light-induced melatonin suppression. The current research aimed to determine if a similar age-related reduction occurs in subjective alertness, mood, and circadian phase-advancing responses. Young (n = 11, 23.0 +/- 2.9 years) and older (n...

journal_title：Journal of biological rhythms

authors： Sletten TL,Revell VL,Middleton B,Lederle KA,Skene DJ

更新日期：2009-02-01 00:00:00

abstract：:A recent report that popliteal illumination shifted the circadian rhythms of body temperature and melatonin challenged the longstanding belief that light phase-shifting the circadian system in mammals is mediated only through the retina. The authors tested effects of popliteal illumination and illumination provided th...

journal_title：Journal of biological rhythms

authors： Jean-Louis G,Kripke DF,Cole RJ,Elliot JA

更新日期：2000-06-01 00:00:00

abstract：:In isolated slices of hypothalamus, suprachiasmatic nucleus (SCN) neurons were recorded intracellularly. Blockade of Ca++ channels increased spike duration, eliminating an early component of the afterhyperpolarization (AHP) that followed evoked spikes. The duration and reversal potential of AHPs were, however, unaffec...

journal_title：Journal of biological rhythms

authors： Thomson AM,West DC

更新日期：1990-04-01 00:00:00

abstract：:Perhaps the most observable of the many circadian oscillations that have been described in both vertebrate and invertebrate animals is the daily alterations in periods of rest and activity. Recent studies in the fruit fly Drosophila melanogaster suggest that these periods of inactivity are not simply rest but share ma...

journal_title：Journal of biological rhythms

authors： Shaw P

更新日期：2003-02-01 00:00:00

abstract：:A single light episode during the first larval stage can set the phase of adult Drosophila activity rhythms, showing that a light-sensitive circadian clock is functional in larvae and is capable of keeping time throughout development. These behavioral data are supported by the finding that neurons expressing clock pro...

journal_title：Journal of biological rhythms

authors： Malpel S,Klarsfeld A,Rouyer F

更新日期：2004-02-01 00:00:00

abstract：:The mammalian circadian pacemaker is located in the suprachiasmatic nucleus (SCN). Various inputs modulate pacemaker phase, including the serotonergic (5HTergic) input from the midbrain raphe. 5HT phase-advances the SCN pacemaker when applied during mid subjective day. In vitro studies indicate that 5HT advances the m...

journal_title：Journal of biological rhythms

authors： Jovanovska A,Prosser RA

更新日期：2002-04-01 00:00:00

abstract：:Testicular growth was monitored in male ferrets subjected to one of the following photoperiodic treatments begun at weaning (8 weeks of age): 8 hr light/day (short days), 18 hr light/day (long days), or short days followed by transition to long days at either 10, 12, or 14 weeks of age. Mean ages to achieve adult test...

journal_title：Journal of biological rhythms

authors： Sisk CL

更新日期：1990-10-01 00:00:00

abstract：:Odors elicit a number of behavioral responses, including attraction and repulsion in Drosophila. In this study, the authors used a T-maze apparatus to show that wild-type Drosophila melanogaster exhibit a robust circadian rhythm in the olfactory attractive and repulsive responses. These responses were lower during the...

journal_title：Journal of biological rhythms

authors： Zhou X,Yuan C,Guo A

更新日期：2005-06-01 00:00:00

abstract：:Little is known about the differences in the neural substrates of circadian rhythms that are responsible for the maintenance of differences between diurnal and nocturnal patterns of activity in mammals. In both groups of animals, the suprachiasmatic nucleus (SCN) functions as the principal circadian pacemaker, and sur...

journal_title：Journal of biological rhythms

authors： Nunez AA,Bult A,McElhinny TL,Smale L

更新日期：1999-08-01 00:00:00

abstract：:The purpose of this study was to determine whether decreased day lengths affect reproduction or the immune system in inbred mice. Irrespective of a nocturnal pineal melatonin rise, the signal for day length information, body and testis weights were the same in various strains 8 weeks after transfer from long to short ...

journal_title：Journal of biological rhythms

authors： Yellon SM,Tran LT

更新日期：2002-02-01 00:00:00

abstract：:Activity patterns are the product of interactions between an internal circadian clock and direct responses to photic and nonphotic features of the environment that are said to "mask" the influence of that clock. Evolutionary transitions between nocturnality and diurnality involve changes in mechanisms underlying both ...

journal_title：Journal of biological rhythms

authors： Cohen R,Smale L,Kronfeld-Schor N

更新日期：2010-02-01 00:00:00

abstract：:The retinohypothalamic tract (RHT), a monosynaptic retinal projection to the SCN, is the major path by which light entrains the circadian system to the external photoperiod. The circadian system of rodents effectively integrates or counts photons, and the magnitude of the rhythm phase response is proportional to the t...

journal_title：Journal of biological rhythms

authors： Muscat L,Morin LP

更新日期：2005-12-01 00:00:00

abstract：:There is little evidence for the involvement of microRNAs (miRs) in the regulation of circadian rhythms, despite the potential relevance of these elements in the posttranscriptional regulation of the clock machinery. The present work aimed to identify miRs targeting circadian genes through a predictive analysis of con...

journal_title：Journal of biological rhythms

authors： Figueredo Dde S,Barbosa MR,Gitaí DL,de Andrade TG

更新日期：2013-04-01 00:00:00

abstract：:The suprachiasmatic nucleus (SCN) drives and synchronizes daily rhythms at the cellular level via transcriptional-translational feedback loops comprising clock genes such as Bmal1 and Period (Per). Glycogen synthase kinase 3 (GSK3), a serine/threonine kinase, phosphorylates at least 5 core clock proteins and shows diu...

journal_title：Journal of biological rhythms

authors： Besing RC,Paul JR,Hablitz LM,Rogers CO,Johnson RL,Young ME,Gamble KL

更新日期：2015-04-01 00:00:00

abstract：:African sleeping sickness is characterized by alterations in rhythmic functions. It is not known if the disease affects the expression of clock genes, which are the molecular basis for rhythm generation. We used a chronic rat model of experimental sleeping sickness, caused by the extracellular parasite Trypanosoma bru...

journal_title：Journal of biological rhythms

authors： Lundkvist GB,Sellix MT,Nygård M,Davis E,Straume M,Kristensson K,Block GD

更新日期：2010-04-01 00:00:00

abstract：:Male rose-ringed parakeets (Psittacula krameri) were transferred to a long photoperiod (LP; LD 16:8) or a short photoperiod (SP; LD 8:16) for 45 or 90 days on four dates corresponding to the beginnings of different reproductive phases in an annual testicular cycle, and testicular responsiveness was evaluated by compar...

journal_title：Journal of biological rhythms

authors： Maitra SK,Dey M

更新日期：1992-04-01 00:00:00

abstract：:Seasonal changes in numerous aspects of mammalian immune function arise as a result of the annual variation in environmental day length (photoperiod), but it is not known if absolute photoperiod or relative change in photoperiod drives these changes. This experiment tested the hypothesis that an individual's history o...

journal_title：Journal of biological rhythms

authors： Prendergast BJ,Pyter LM

更新日期：2009-12-01 00:00:00

abstract：:The safety and efficacy of chemotherapeutics can vary as a function of the time of their delivery during the day. This study aimed to improve the treatment of glioblastoma (GBM), the most common brain cancer, by testing whether the efficacy of the DNA alkylator temozolomide (TMZ) varies with the time of its administra...

journal_title：Journal of biological rhythms

authors： Slat EA,Sponagel J,Marpegan L,Simon T,Kfoury N,Kim A,Binz A,Herzog ED,Rubin JB

更新日期：2017-04-01 00:00:00

abstract：:Life in the Arctic presents organisms with multiple challenges, including extreme photic conditions, cold temperatures, and annual loss and daily movement of sea ice. Polar bears (Ursus maritimus) evolved under these unique conditions, where they rely on ice to hunt their main prey, seals. However, very little is know...

journal_title：Journal of biological rhythms

authors： Ware JV,Rode KD,Robbins CT,Leise T,Weil CR,Jansen HT

更新日期：2020-04-01 00:00:00

abstract：:Previous research has demonstrated a clear link between late chronotype and depression. The vulnerability factors underpinning this link, however, are unclear. Here the relationship between two specific emotion regulation strategies, cognitive reappraisal and expressive suppression, and chronotype was investigated usi...

journal_title：Journal of biological rhythms

authors： Watts AL,Norbury R

更新日期：2017-08-01 00:00:00

abstract：:Social jetlag represents the discrepancy between circadian and social clocks, which is measured as the difference in hours in midpoint of sleep between work days and free days. Previous studies have shown social jetlag to be associated with body mass index (BMI), glycated hemoglobin levels, heart rate, depressive symp...

journal_title：Journal of biological rhythms

authors： Rutters F,Lemmens SG,Adam TC,Bremmer MA,Elders PJ,Nijpels G,Dekker JM

更新日期：2014-10-01 00:00:00

abstract：:Crustaceans have frequently been used to study the neuroethology of both agonistic behavior and circadian rhythms, but whether their highly stereotyped and quantifiable agonistic activity is controlled by circadian pacemakers has, so far, not been investigated. Isolated marbled crayfish (Procambarus spec.) displayed r...

journal_title：Journal of biological rhythms

authors： Farca Luna AJ,Hurtado-Zavala JI,Reischig T,Heinrich R

更新日期：2009-02-01 00:00:00

abstract：:The pineal organ of the lizard Anolis carolinensis acts as a transducer of photoperiodic information, since light can affect the pineal melatonin rhythm (PMR). The synthesis and secretion of melatonin may be a major mechanism whereby a circadian pacemaker within the pineal can control circadian clocks located elsewher...

journal_title：Journal of biological rhythms

authors： Underwood H,Calaban M

更新日期：1987-10-01 00:00:00

abstract：:An understanding of the retinal mechanisms in mammalian photoentrainment will greatly facilitate optimization of the wavelength, intensity, and duration of phototherapeutic treatments designed to phase shift endogenous biological rhythms. A small population of widely dispersed retinal ganglion cells projecting to the ...

journal_title：Journal of biological rhythms

authors： Rollag MD,Berson DM,Provencio I

更新日期：2003-06-01 00:00:00

abstract：:From the mathematical study of simple models for circadian rhythm, the authors identified a clear effect of saturation in the enzyme kinetics on the promotion or suppression of a sustained oscillation. In the models, a clock gene (per gene) is transcribed to produce mRNAs, which are translated to produce proteins in t...

journal_title：Journal of biological rhythms

authors： Kurosawa G,Iwasa Y

更新日期：2002-12-01 00:00:00

abstract：:Sleep disturbances are an all-too-familiar symptom of jet lag and a prime source of complaints for transmeridian travelers and flight crews alike. They are the result of a temporary loss of synchrony between an abruptly shifted sleep period, timed in accordance with the new local day-night cycle, and a gradually reent...

journal_title：Journal of biological rhythms

authors： Boulos Z,Campbell SS,Lewy AJ,Terman M,Dijk DJ,Eastman CI

更新日期：1995-06-01 00:00:00

abstract：:Morningness and eveningness preference, an endogenous component of the circadian clock, is characterized by an interindividual difference in circadian phase and requires of humans a specific timing of behavior. The biological rhythms of morning and evening types are consequently phase shifted with fixed socioeconomic ...

journal_title：Journal of biological rhythms

authors： Taillard J,Philip P,Chastang JF,Diefenbach K,Bioulac B

更新日期：2001-04-01 00:00:00

abstract：:Intertidal species have both circadian and circatidal clocks. Although the behavioral evidence for these oscillators is more than 5 decades old, virtually nothing is known about their molecular clockwork. Pigment-dispersing hormones (PDHs) were originally described in crustaceans. Their insect homologs, pigment-disper...

journal_title：Journal of biological rhythms

authors： Beckwith EJ,Lelito KR,Hsu YW,Medina BM,Shafer O,Ceriani MF,de la Iglesia HO

更新日期：2011-12-01 00:00:00

abstract：:The authors sought to investigate the role of phytochromes A and B (phyA and phyB) and cryptochromes 1 and 2 (cryl and cry2) in the synchronization of the leaf position rhythm in Arabidopsis thaliana. The seedlings were transferred from white light-dark cycles to free-running conditions with or without exposure to a l...

journal_title：Journal of biological rhythms

authors： Yanovsky MJ,Mazzella MA,Whitelam GC,Casal JJ

更新日期：2001-12-01 00:00:00

abstract：:Among the scientific resources that Colin Pittendrigh passed on to his colleagues after his death in 1996 were two unpublished papers. These manuscripts, developed first in the mid-1960s and continually updated and refined through the late 1970s, centered on the development and experimental exploration of a model of c...

journal_title：Journal of biological rhythms

authors： Tackenberg MC,Johnson CH,Page TL,Daan S

更新日期：2017-08-01 00:00:00