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：:Austrovenus stutchburyi is an intertidal, burrowing, filter-feeding bivalve. It exhibits a strong, approximately tidal pattern in the time of gaping of its valves when in constant laboratory conditions. Individuals that have been held in laboratory conditions long enough to lose their overt gaping pattern will respond...

journal_title：Journal of biological rhythms

authors： Williams BG,Pilditch CA

更新日期：1997-04-01 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：: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：: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

authors： Ruby NF,Heller HC

更新日期：1996-06-01 00:00:00

abstract：:Several authors have suggested that the transcriptional regulatory protein c-Fos might be part of the mechanism for photic entrainment of the circadian pacemaker in the suprachiasmatic nucleus (SCN) to environmental light:dark cycles. This hypothesis has been based on evidence gathered using single light pulses admini...

journal_title：Journal of biological rhythms

authors： Schwartz WJ,Peters RV,Aronin N,Bennett MR

更新日期：1996-03-01 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

authors： Ravikumar G,Senthilkumaran B,Tewary PD,Goel AK

更新日期：1995-12-01 00:00:00

abstract：:House sparrows (Passer domesticus) whose circadian rhythms of locomotor activity and feeding had been abolished by pinealectomy were held in constant dim light and periodically exposed to melatonin in the drinking water. By alternating 8 h of melatonin water with variable phases of tap water, rhythms with periods (T) ...

journal_title：Journal of biological rhythms

authors： Heigl S,Gwinner E

更新日期：1995-09-01 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：: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：:A rhythm mutant of Drosophila melanogaster was induced by chemical mutagenesis and isolated by testing for locomotor activity rhythms, which in the new variant had periods of approximately 16 hr. The sex-linked mutation responsible for this ultrashort period causes 20-hr rhythms when heterozygous with a normal X. This...

journal_title：Journal of biological rhythms

authors： Konopka RJ,Hamblen-Coyle MJ,Jamison CF,Hall JC

更新日期：1994-01-01 00:00:00

abstract：:Entrainability of the circadian rhythm of mosquito flight and locomotor activity was investigated by giving a 24-hr temperature cycle (28 degrees C for 16 hr, 23 degrees C for 8 hr) to the free-running rhythm or by shifting the temperature cycle. The phase angle difference between the entrained rhythm and the temperat...

journal_title：Journal of biological rhythms

authors： Chiba Y,Uki M,Kawasaki Y,Matsumoto A,Tomioka K

更新日期：1993-10-01 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：: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

authors： Wassmer GT,Page TL

更新日期：1993-04-01 00:00:00

abstract：:Extracellular spike activity from three different types of visual interneurons found in the optic lobe of the giant cockroach Blaberus giganteus was recorded. The spike rate of all three types of neurons fluctuated in a circadian manner in constant darkness (DD). Two types, so-called "on" neurons (ON1 and ON2), respon...

journal_title：Journal of biological rhythms

authors： Bult R,Mastebroek HA

更新日期：1993-01-01 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

authors： Moore RY

更新日期：1993-01-01 00:00:00

abstract：:Rats anticipate a fixed daily feeding time by entrainment of a component of their multioscillatory circadian system. The range of stimuli capable of entraining this component is little studied. Previous studies suggest that restricted water access is not an effective entrainment stimulus, as measured by general locomo...

journal_title：Journal of biological rhythms

authors： Mistlberger RE

更新日期：1992-07-01 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：:Surgical isolation of the suprachiasmatic nuclei (SCN) within a hypothalamic island is reported to produce loss of circadian rhythmicity. The results have been interpreted to indicate that SCN efferents are necessary for the expression of circadian rhythms. It is not clear, however, whether the loss of circadian rhyth...

journal_title：Journal of biological rhythms

authors： Hakim H,DeBernardo AP,Silver R

更新日期：1991-07-01 00:00:00

abstract：:Threads of evidence from recent experimentation in retinal morphology, neurochemistry, electrophysiology, and visual perception point toward rhythmic ocular processes that may be integral components of circadian entrainment in mammals. Components of retinal cell biology (rod outer-segment disk shedding, inner-segment ...

journal_title：Journal of biological rhythms

authors： Remé CE,Wirz-Justice A,Terman M

更新日期：1991-04-01 00:00:00

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：: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：: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：: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：: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：: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：:Past research has shown that there is a circadian oscillator in laboratory rats that is entrained by restricted feeding schedules. However, in laboratory rats at least, the light-dark (LD) cycle is the dominant zeitgeber in the entrainment of wheel-running activity rhythms. Given that dasyurid marsupials are predomina...

journal_title：Journal of biological rhythms

authors： Coleman GJ,O'Reilly HM,Armstrong SM

更新日期：1989-04-01 00:00:00

abstract：:Although pineal "synaptic" ribbons (SR) are frequently examined by means of quantitative electron microscopy, their functional significance remains unclear. The same is true for related structures--"synaptic" spherules (SPH). In the course of such studies, it has been noted that SR counts may differ from laboratory to...

journal_title：Journal of biological rhythms

authors： Karasek M,Lewinski A,Vollrath L

更新日期：1988-04-01 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：: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：: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

authors： Skopik SD,Cain W,Patel NG,Newswanger DL

更新日期：1986-07-01 00:00:00

abstract：:The frequency demultiplication hypothesis (FDH) posits that circannual rhythms are generated from circadian cycles by frequency transformation to the lower-frequency rhythm. To test the FDH, we determined the periods of the circannual body mass and estrous cycles of golden-mantled ground squirrels with circadian locom...

journal_title：Journal of biological rhythms

authors： Carmichael MS,Zucker I

更新日期：1986-01-01 00:00:00