Searching for biological rhythms: peak detection in the periodogram of unequally spaced data.

abstract：:We investigated the extent to which photoperiodic fluctuations synchronize annual thyroid and gonadal rhythmicity in edible dormice. The effects of different daylength manipulations (LD 4:20, LD 6:18, LD 18:6, LD 20:4) were examined during the two critical ascending and regressive phases of the annual plasma testoster...

journal_title：Journal of biological rhythms

authors： Jallageas M,Mas N,Nouguier-Soulé J

更新日期：1991-01-01 00:00:00

abstract：:The light preferences of fruit flies were tested by 2 different means. First, flies were allowed to choose between different illuminations, and their favorite resting, grooming, and feeding places were determined with an infrared-sensitive camera. Second, the activity levels of the animals during their main daily acti...

journal_title：Journal of biological rhythms

authors： Rieger D,Fraunholz C,Popp J,Bichler D,Dittmann R,Helfrich-Förster C

更新日期：2007-10-01 00:00:00

abstract：:Hibernating animals have been a successful model system for elucidating fundamental properties of many physiological systems. Over the past 50 years, a diverse literature has emerged on the role of the circadian system in control and expression of winter torpor in several orders of birds and mammals. This body of rese...

journal_title：Journal of biological rhythms

authors： Ruby NF

更新日期：2003-08-01 00:00:00

abstract：:To determine if a circadian rhythm known to be functionally related to the reproductive axis varies on a circannual basis, we monitored the circadian secretion of melatonin at monthly intervals for 2 years in four ovariectomized, estradiol-implanted ewes held in a constant short-day photoperiod. Prior to the study, ew...

journal_title：Journal of biological rhythms

authors： Thrun LA,Moenter SM,O'Callaghan D,Woodfill CJ,Karsch FJ

更新日期：1995-03-01 00:00:00

abstract：:DEC1 and DEC2-basic helix-loop-helix transcription factors-exhibit a circadian expression in the suprachiasmatic nucleus and other peripheral tissues and seem to play roles in regulating the mammalian circadian rhythm by suppressing the CLOCK/BMAL1-activated promoters of Per1, Dec1, and Dec2. The authors present data ...

journal_title：Journal of biological rhythms

authors： Noshiro M,Furukawa M,Honma S,Kawamoto T,Hamada T,Honma K,Kato Y

更新日期：2005-10-01 00:00:00

abstract：:Siberian hamsters (Phodopus sungorus) exhibit changes in immune function following adaptation to short photoperiods, including a marked attenuation of energetically expensive thermoregulatory and behavioral responses to gram-negative bacterial infections. Whether this seasonal attenuation of the immune response is idi...

journal_title：Journal of biological rhythms

authors： Baillie SR,Prendergast BJ

更新日期：2008-02-01 00:00:00

abstract：:The Drosophila clock relies on transcriptional feedback loops that generate daily oscillations of the clock gene expression at mRNA and protein levels. In the evening, the CLOCK (CLK) and CYCLE (CYC) basic helix-loop-helix (bHLH) PAS-domain transcription factors activate the expression of the period (per) and timeless...

journal_title：Journal of biological rhythms

authors： Richier B,Michard-Vanhée C,Lamouroux A,Papin C,Rouyer F

更新日期：2008-04-01 00:00:00

abstract：:The aim of this study was to replicate and extend previous work in which the authors observed lower, shorter, and advanced nocturnal melatonin secretion patterns in premenstrually depressed patients compared to those in healthy control women. The authors also sought to test the hypothesis that the therapeutic effect o...

journal_title：Journal of biological rhythms

authors： Parry BL,Berga SL,Mostofi N,Klauber MR,Resnick A

更新日期：1997-02-01 00:00:00

abstract：:Photic signals affect circadian activity rhythms by both phasic and tonic mechanisms that modulate pacemaker phase and period. In mammals, the effects of light on circadian activity are mediated by the retina, which communicates with the suprahiasmatic nucleus (SCN) by two different anatomical routes: the retino-hypot...

journal_title：Journal of biological rhythms

authors： Pickard GE,Ralph MR,Menaker M

更新日期：1987-04-01 00:00:00

abstract：:The annual cycle of reproductive function in starlings (Sturnus vulgaris) is driven by seasonal changes in daylength and consists of a 6-month period of photosensitivity, culminating in maximal gonadal development, followed by a 6-month period of photorefractoriness. If male starlings are held under a constant photope...

journal_title：Journal of biological rhythms

authors： Dawson A,McNaughton FJ

更新日期：1993-07-01 00:00:00

abstract：:Using quantitative autoradiography, 2-(125)I-melatonin binding was investigated throughout the light:dark cycle in the suprachiasmatic nuclei (SCN), paraventricular nuclei (PVT), and pars tuberalis (PT) of adult female Siberian hamsters kept for 10 weeks in either long or short photoperiods (LP or SP, respectively). P...

journal_title：Journal of biological rhythms

authors： Recio J,Pévet P,Vivien-Roels B,Míguez JM,Masson-Pévet M

更新日期：1996-12-01 00:00:00

abstract：:Individuals of the shore crab Carcinus maenas were exposed to artificial cycles, applied in tidal antiphase, of pairs of the three major environmental variables that entrain circatidal rhythmicity in this species: salinity, temperature, and hydrostatic pressure. During entrainment, the observed locomotor activity patt...

journal_title：Journal of biological rhythms

authors： Reid DG,Naylor E

更新日期：1990-01-01 00:00:00

abstract：:Rhodopsin 7 ( Rh7), a new invertebrate Rhodopsin gene, was discovered in the genome of Drosophila melanogaster in 2000, but its function has remained elusive. We generated an Rh7 null mutant ( Rh70) by P element-mediated mutagenesis and found that an absence of Rh7 had significant effects on fly activity patterns duri...

journal_title：Journal of biological rhythms

authors： Kistenpfennig C,Grebler R,Ogueta M,Hermann-Luibl C,Schlichting M,Stanewsky R,Senthilan PR,Helfrich-Förster C

更新日期：2017-10-01 00:00:00

abstract：:Despite the omnipresence of artificial and natural light exposure, there exists little guidance in the United States and elsewhere on light exposure in terms of timing, intensity, spectrum, and other light characteristics known to affect human health, performance, and well-being; in parallel, there is little informati...

journal_title：Journal of biological rhythms

authors： Mason IC,Boubekri M,Figueiro MG,Hasler BP,Hattar S,Hill SM,Nelson RJ,Sharkey KM,Wright KP,Boyd WA,Brown MK,Laposky AD,Twery MJ,Zee PC

更新日期：2018-10-01 00:00:00

abstract：:How the cellular elements of the SCN are synchronized to each other is not well understood. We explore circadian oscillations manifest at the level of the cell, the tissue, and the whole animal to better understand intra-SCN synchrony and master clock function of the nucleus. At each level of analysis, responses to va...

journal_title：Journal of biological rhythms

authors： Butler MP,Silver R

更新日期：2009-10-01 00:00:00

abstract：:Daylight saving time (DST) is a source of circadian disruption impinging on millions of people every year. Our aim was to assess modifications, if any, in the number, type, and outcome of Accident & Emergency (A&E) visits/return visits over the DST months. The study included 366,527 visits and 84,380 return visits to ...

journal_title：Journal of biological rhythms

authors： Ferrazzi E,Romualdi C,Ocello M,Frighetto G,Turco M,Vigolo S,Fabris F,Angeli P,Vettore G,Costa R,Montagnese S

更新日期：2018-10-01 00:00:00

abstract：:The adjustment of hamsters to advanced light-dark (LD) cycles can be greatly accelerated by scheduling a single 3-hr bout of extra activity in a novel running wheel, starting about 7 hr before the time when the animals become active in the preceding LD cycle. The present experiments were designed to provide stronger e...

journal_title：Journal of biological rhythms

authors： Mrosovsky N

更新日期：1989-10-01 00:00:00

abstract：:Over 90% of neurons within the suprachiasmatic nucleus (SCN) express γ-aminobutyric acid (GABA). Although GABA is primarily an inhibitory neurotransmitter, in vitro studies suggest that the activation of GABAA receptors (GABAAR) elicits excitation in the adult SCN. The ratio of excitatory to inhibitory responses to GA...

journal_title：Journal of biological rhythms

authors： McNeill JK 4th,Walton JC,Albers HE

更新日期：2018-08-01 00:00:00

abstract：:The circadian clock plays an important role in adaptation in time and space by synchronizing changes in physiological, developmental, and behavioral traits of organisms with daily and seasonal changes in their environment. We have studied some features of the circadian activity and clock organization in a northern Dro...

journal_title：Journal of biological rhythms

authors： Kauranen H,Menegazzi P,Costa R,Helfrich-Förster C,Kankainen A,Hoikkala A

更新日期：2012-10-01 00:00:00

abstract：:The circadian rhythm of eclosion activity and its pacemaker were analyzed in a series of latitudinal races of Drosophila auraria ranging from 34.2 degrees to 42.9 degrees N in Japan. The phase of the rhythm (psi EL) to the daily photoperiod (PP) changes as daylength is increased, and the slope of psi EL (PP) changes w...

journal_title：Journal of biological rhythms

authors： Pittendrigh CS,Takamura T

更新日期：1989-07-01 00:00:00

abstract：:A role for nitric oxide in circadian responses to light has been indicated in previous studies. To determine the specific function of NO-, the authors manipulated NO- and nitric oxide synthase (NOS) activity prior to light pulses that would normally induce phase shifts. The NOS inhibitor, L-NAME, selectively attenuate...

journal_title：Journal of biological rhythms

authors： Melo L,Golombek DA,Ralph MR

更新日期：1997-08-01 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：:To date, it is largely unknown which light settings define the optimum to steer alertness and cognitive control during regular daytime working hours. In the current article, we used a multimeasure approach combined with a relatively large sample size ( N = 60) and a large range of intensity levels (20-2000 lux at eye ...

journal_title：Journal of biological rhythms

authors： Smolders KCHJ,Peeters ST,Vogels IMLC,de Kort YAW

更新日期：2018-12-01 00:00:00

abstract：:Ground squirrels, Spermophilus tridecemlineatus, were kept in a 12:12 h light-dark cycle. As expected for a diurnal species, their locomotor activity occurred almost entirely in the daytime. Expression of mPer1 and mPer2 in the suprachiasmatic nucleus was studied at six time points by in situ hybridization. For both t...

journal_title：Journal of biological rhythms

authors： Mrosovsky N,Edelstein K,Hastings MH,Maywood ES

更新日期：2001-10-01 00:00:00

abstract：:Photoperiod influences the distribution of sleep and waking and electroencephalogram (EEG) power density in the Djungarian hamster. In an experimental procedure combining short photoperiod (SP) and low ambient temperature, the light-dark difference in the amount of sleep was decreased, and the changes in slow-wave act...

journal_title：Journal of biological rhythms

authors： Deboer T,Vyazovskiy VV,Tobler I

更新日期：2000-10-01 00:00:00

abstract：:The circadian system in higher organisms temporally orchestrates rhythmic changes in a vast number of genes and gene products in different organs. Complex interactions between these components, both within and among cells, ultimately lead to rhythmic behavior and physiology. Identifying the plethora of circadian targe...

journal_title：Journal of biological rhythms

authors： De Haro L,Panda S

更新日期：2006-12-01 00:00:00

abstract：:Siberian hamsters are photoperiodic seasonally breeding rodents. To date, there has been no evidence that Siberian hamsters exhibit an annual rhythm in reproductive, thermoregulatory, molt, or body mass changes. However, given that the termination of their winter cycle is under endogenous control, the authors thought ...

journal_title：Journal of biological rhythms

authors： Anchordoquy HC,Lynch GR

更新日期：2000-04-01 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：:The large repertoire of circadian rhythms in diverse organisms depends on oscillating central clock genes, input pathways for entrainment, and output pathways for controlling rhythmic behaviors. Stress-activated p38 MAP Kinases (p38K), although sparsely investigated in this context, show circadian rhythmicity in mamma...

journal_title：Journal of biological rhythms

authors： Vrailas-Mortimer AD,Ryan SM,Avey MJ,Mortimer NT,Dowse H,Sanyal S

更新日期：2014-12-01 00:00:00

abstract：:Aging alters numerous aspects of circadian biology, including the amplitude of rhythms generated by the suprachiasmatic nuclei (SCN) of the hypothalamus, the site of the central circadian pacemaker in mammals, and the response of the pacemaker to environmental stimuli such as light. Although previous studies have desc...

journal_title：Journal of biological rhythms

authors： Kolker DE,Fukuyama H,Huang DS,Takahashi JS,Horton TH,Turek FW

更新日期：2003-04-01 00:00:00