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 testosterone and thyroxine cycles that correspond to naturally increasing or decreasing photoperiod variations. The data failed to demonstrate any essential photoperiodic contribution to control systems that generate these two annual biological rhythms in dormice.
journal_name
J Biol Rhythmsjournal_title
Journal of biological rhythmsauthors
Jallageas M,Mas N,Nouguier-Soulé Jdoi
10.1177/074873049100600405subject
Has Abstractpub_date
1991-01-01 00:00:00pages
343-52issue
4eissn
0748-7304issn
1552-4531journal_volume
6pub_type
杂志文章abstract::The mammalian circadian clock in the suprachiasmatic nucleus (SCN) drives and maintains 24-h physiological rhythms, the phases of which are set by the local environmental light-dark cycle. Gastrin-releasing peptide (GRP) communicates photic phase setting signals in the SCN by increasing neurophysiological activity of ...
journal_title:Journal of biological rhythms
pub_type: 杂志文章
doi:10.1177/0748730410396678
更新日期:2011-04-01 00:00:00
abstract::During the first 7 weeks of postnatal life, short day lengths inhibit the onset of puberty in many photoperiodic rodents, but not in Syrian hamsters. In this species, timing of puberty and fecundity are independent of the early postnatal photoperiod. Gestational day length affects postnatal reproductive development in...
journal_title:Journal of biological rhythms
pub_type: 杂志文章
doi:10.1177/0748730408322985
更新日期:2008-10-01 00:00:00
abstract::Temperature compensation of circadian rhythms in neuronal firing rate was investigated in the suprachiasmatic nucleus (SCN) of ground squirrels and rats in vitro. A reduction in SCN temperature from 37 to 25 degrees C reduced peak firing rates by > 70% in rats but only by approximately 21% in squirrels; trough firing ...
journal_title:Journal of biological rhythms
pub_type: 杂志文章
doi:10.1177/074873049601100205
更新日期:1996-06-01 00:00:00
abstract::The circadian clock represents an anticipatory mechanism, well preserved in evolution. It has a critical impact on most aspects of the physiology of light-sensitive organisms. These rhythmic processes are governed by environmental cues (fluctuations in light intensity and temperature), an internal circadian timing sys...
journal_title:Journal of biological rhythms
pub_type: 杂志文章,评审
doi:10.1177/0748730414557634
更新日期:2015-04-01 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
pub_type: 杂志文章
doi:10.1177/0748730413476827
更新日期:2013-04-01 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
pub_type: 杂志文章
doi:10.1177/0748730409360963
更新日期:2010-04-01 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
pub_type: 杂志文章
doi:10.1177/0748730411420242
更新日期:2011-12-01 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
pub_type: 杂志文章,评审
doi:10.1177/0748730403254971
更新日期:2003-08-01 00:00:00
abstract::The synchronizing stimulus, its transduction site, and the afferent pathways responsible for feeding entrainment remain unknown. In fish, the role of the diet in the development of feeding anticipatory activity (FAA) is not well understood and fundamental questions on the mechanisms of feeding entrainment, such as the...
journal_title:Journal of biological rhythms
pub_type: 杂志文章
doi:10.1177/074873040101600107
更新日期:2001-02-01 00:00:00
abstract::Groups of Syrian hamsters were exposed to LD cycles with twilight transitions and photoperiods simulating natural lighting conditions at the summer solstice (SS), equinox, and winter solstice (WS) at 41 degrees N and at the winter solstice at the Arctic Circle (WS 66 degrees N) but with daytime illuminance truncated a...
journal_title:Journal of biological rhythms
pub_type: 杂志文章
doi:10.1177/0748730404272907
更新日期:2005-04-01 00:00:00
abstract::Nonphotic stimuli can reset and entrain circadian activity rhythms in hamsters and mice, and serotonin is thought to be involved in the phase-resetting effects of these stimuli. In the present study, the authors examined the effect of the serotonin agonist quipazine on circadian activity rhythms in three inbred strain...
journal_title:Journal of biological rhythms
pub_type: 杂志文章
doi:10.1177/074873099129000524
更新日期:1999-04-01 00:00:00
abstract::Almost exclusively, photoperiodic insects respond to a given photoperiod in one of two ways: a "long-day" response or a "short-day" response. Intermediate responses occur only at a very restricted range of photoperiods (often less than 30 min) and are generally population phenomena rather than intermediate responses o...
journal_title:Journal of biological rhythms
pub_type: 杂志文章
doi:10.1177/074873049300800104
更新日期:1993-04-01 00:00:00
abstract::Siberian hamsters transferred from a long (16 h light/day [16 L]) to an intermediate (13.5 L) day length (DL) undergo testicular regression within 2 months followed approximately 2 months later by "spontaneous" testicular recrudescence. Recovery of gonadal function after prolonged exposure to intermediate DLs is thoug...
journal_title:Journal of biological rhythms
pub_type: 杂志文章
doi:10.1177/074873002129002645
更新日期:2002-08-01 00:00:00
abstract::Circadian rhythms are programmed by the suprachiasmatic nucleus (SCN), which relies on neuropeptide signaling to maintain daily timekeeping. Vasoactive intestinal polypeptide (VIP) is critical for SCN function, but the precise role of VIP neurons in SCN circuits is not fully established. To interrogate their contribut...
journal_title:Journal of biological rhythms
pub_type: 杂志文章
doi:10.1177/0748730420925573
更新日期:2020-08-01 00:00:00
abstract::Arctic and subarctic environments are exposed to extreme light: dark (LD) regimes, including periods of constant light (LL) and constant dark (DD) and large daily changes in day length, but very little is known about circadian rhythms of mammals at high latitudes. The authors investigated the circadian rhythms of a su...
journal_title:Journal of biological rhythms
pub_type: 杂志文章
doi:10.1177/0748730404264200
更新日期:2004-06-01 00:00:00
abstract::Abstract The cyanobacterial clock protein KaiC regulates the circadian cycle by exhibiting rhythms in transcription, translation, and phosphorylation. KaiC phosphorylation persists in circadian cycling even under transcription-less conditions and was reconstituted in vitro by incubating KaiC, KaiA, and KaiB. This pres...
journal_title:Journal of biological rhythms
pub_type: 杂志文章
doi:10.1177/0748730406291329
更新日期:2006-10-01 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
pub_type: 杂志文章
doi:10.1177/074873049000500405
更新日期:1990-01-01 00:00:00
abstract::Although overt diurnal rhythms of behavior do not begin until well after birth, molecular studies suggest that the circadian clock may begin much earlier at a cellular level: mouse embryonic fibroblasts, for example, already possess robust clocks. By multiple criteria, we found no circadian clock present in mouse embr...
journal_title:Journal of biological rhythms
pub_type: 杂志文章
doi:10.1177/0748730410385281
更新日期:2010-12-01 00:00:00
abstract::In vertebrates, reproductive output often increases with age. Unlike older birds, first-year photoperiodic birds lack experience with the reproductively stimulatory effects of long day lengths (photostimulation). We examined whether age-related differences in annual reproductive development could be partially attribut...
journal_title:Journal of biological rhythms
pub_type: 杂志文章
doi:10.1177/0748730412468087
更新日期:2013-02-01 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
pub_type: 杂志文章
doi:10.1177/0748730417721826
更新日期:2017-10-01 00:00:00
abstract::A 12-hr dark period, at a temperature high enough to permit time measurement to occur, is necessary for maximal induction of larval diapause in the European corn borer, Ostrinia nubilalis. In the present study, induction of diapause only occurred in a periodic environment. This was in the form of certain (1) light-dar...
journal_title:Journal of biological rhythms
pub_type: 杂志文章
doi:10.1177/074873048600100205
更新日期:1986-07-01 00:00:00
abstract::Most visual system functions, such as opsin gene expression, retinal neural transmission, light perception, and visual sensitivity, display robust day-night rhythms. The rhythms persist in constant lighting conditions, suggesting the involvement of endogenous circadian clocks. While the circadian pacemakers that contr...
journal_title:Journal of biological rhythms
pub_type: 杂志文章,评审
doi:10.1177/0748730419863917
更新日期:2019-10-01 00:00:00
abstract::The circadian timing system has three principal elements: the retina, the intergeniculate leaflet (IGL) of the thalamus, and the suprachiasmatic nucleus (SCN). Since the human circadian timing system cannot be studied experimentally, we have used another primate, the macaque monkey, to help provide insight into the or...
journal_title:Journal of biological rhythms
pub_type: 杂志文章,评审
doi:
更新日期:1993-01-01 00:00:00
abstract::The measurement of circulating levels of brain-derived neurotrophic factor (BDNF) has been proposed to be a marker of disease and an indicator of recovery. Thus, knowing the temporal pattern and influence of potential circadian rhythms is important. Although several studies have measured BDNF at different times of day...
journal_title:Journal of biological rhythms
pub_type: 杂志文章
doi:10.1177/0748730417693124
更新日期:2017-02-01 00:00:00
abstract::The possibility that feeding may act as a zeitgeber has been investigated in captive Svalbard ptarmigan by recording feeding or food-searching activity (FA) in birds given periodic access to food (PAF) under light-dark (LD) cycles or in continuous bright (LL) or dim light (DD) conditions. Except during LL, anticipator...
journal_title:Journal of biological rhythms
pub_type: 杂志文章
doi:10.1177/074873049801300504
更新日期:1998-10-01 00:00:00
abstract::Circadian clocks drive daily rhythms of physiology and behavior in multiple organisms and synchronize these rhythms to environmental cycles of light and temperature. The basic mechanism of the clock consists of a transcription-translation feedback loop, in which key clock proteins negatively regulate their own transcr...
journal_title:Journal of biological rhythms
pub_type: 杂志文章,评审
doi:10.1177/0748730419868136
更新日期:2019-12-01 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
pub_type: 杂志文章
doi:10.1177/0748730408328933
更新日期:2009-02-01 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
pub_type: 杂志文章
doi:10.1177/0748730407311518
更新日期:2008-02-01 00:00:00
abstract::The authors analyzed the upstream regulatory region of purF, a gene that is expressed in a minority phase that peaks at dawn (class 2 circadian phasing) in Synechococcus elongatus, to determine whether specific cis elements are responsible for this characteristic expression pattern. Fusions of various promoter-bearing...
journal_title:Journal of biological rhythms
pub_type: 杂志文章
doi:10.1177/0748730403262056
更新日期:2004-04-01 00:00:00
abstract::Endogenous circadian rhythms are involved in various photoperiodic responses of birds. Investigations involving the mechanisms of photoperiodic time measurement in birds have been confined mainly to temperate zone species using males exclusively. Due to the paucity of experimental evidence on subtropical birds that ha...
journal_title:Journal of biological rhythms
pub_type: 杂志文章
doi:10.1177/074873049501000405
更新日期:1995-12-01 00:00:00