Experts and Doctors on photoperiod in United States


Locale: United States
Topic: photoperiod

Top Publications

  1. Thompson C, Brenowitz E. Caspase inhibitor infusion protects an avian song control circuit from seasonal-like neurodegeneration. J Neurosci. 2008;28:7130-6 pubmed publisher
    ..These results strengthen the case for the possible therapeutic use of caspase inhibitors under certain neurodegenerative conditions. ..
  2. Weil Z, Workman J, Karelina K, Nelson R. Short photoperiods alter cannabinoid receptor expression in hypothalamic nuclei related to energy balance. Neurosci Lett. 2011;491:99-103 pubmed publisher
    ..These data suggest a potential role for reduced cannabinoid drive in mediating short day-induced alterations in energy balance. ..
  3. Blackman B, Michaels S, Rieseberg L. Connecting the sun to flowering in sunflower adaptation. Mol Ecol. 2011;20:3503-12 pubmed publisher
    ..Distinct genetic mechanisms contribute to convergent evolution of photoperiod responses within sunflower, suggesting regulatory network architecture does not impose strong constraints on the evolution of phenotypic plasticity...
  4. Veilleux C, Cummings M. Nocturnal light environments and species ecology: implications for nocturnal color vision in forests. J Exp Biol. 2012;215:4085-96 pubmed publisher
    ..002). These results suggest that variation in nocturnal light environments and species ecology together influence cone spectral tuning and color vision in nocturnal mammals. ..
  5. Li H, Proudman J, Kuenzel W. Differential regulation of gene expression and release of FSH and prolactin by long day and sulfamethazine in chicks. Gen Comp Endocrinol. 2009;161:262-6 pubmed publisher
    ..Results demonstrate a differential role of long day exposure and SMZ intake on the regulation of FSH and PRL synthesis and secretion and suggest that some effects of SMZ on gonadal development may be mediated by the pituitary. ..
  6. Demas G, Drazen D, Jasnow A, Bartness T, Nelson R. Sympathoadrenal system differentially affects photoperiodic changes in humoral immunity of Siberian hamsters (Phodopus sungorus). J Neuroendocrinol. 2002;14:29-35 pubmed
    ..NE content was markedly reduced in denervated hamsters compared to sham-operated hamsters. Collectively, these results suggest that the sympathoadrenal system is associated with photoperiodic changes in immune function...
  7. Duncan M, Hester J, Hopper J, Franklin K. The effects of aging and chronic fluoxetine treatment on circadian rhythms and suprachiasmatic nucleus expression of neuropeptide genes and 5-HT1B receptors. Eur J Neurosci. 2010;31:1646-54 pubmed publisher
  8. Bedrosian T, Fonken L, Walton J, Haim A, Nelson R. Dim light at night provokes depression-like behaviors and reduces CA1 dendritic spine density in female hamsters. Psychoneuroendocrinology. 2011;36:1062-9 pubmed publisher
    ..Importantly, the present results suggest that night-time low level illumination, comparable to levels that are pervasive in North America and Europe, may contribute to the increasing prevalence of mood disorders. ..
  9. Sukumaran S, Jusko W, Dubois D, Almon R. Light-dark oscillations in the lung transcriptome: implications for lung homeostasis, repair, metabolism, disease, and drug action. J Appl Physiol (1985). 2011;110:1732-47 pubmed publisher

More Information

Publications137 found, 100 shown here

  1. Dahl G. Effects of short day photoperiod on prolactin signaling in dry cows: a common mechanism among tissues and environments?. J Anim Sci. 2008;86:10-4 pubmed
    ..g., heat stress) also. Thus, shifts in gene expression related to PRL signaling may provide an environmentally mediated mechanism to alter production and health in cows as they transition into lactation. ..
  2. do Amaral B, Connor E, Tao S, Hayen M, Bubolz J, Dahl G. Heat stress abatement during the dry period influences metabolic gene expression and improves immune status in the transition period of dairy cows. J Dairy Sci. 2011;94:86-96 pubmed publisher
  3. Duncan M. Circannual prolactin rhythms: calendar-like timer revealed in the pituitary gland. Trends Endocrinol Metab. 2007;18:259-60 pubmed
    ..Does the pars tuberalis, the site of pituitary gland melatonin receptors, generate circannual rhythms and integrate photoperiodic signals mediated by melatonin? ..
  4. Moffatt Blue C, Sury J, Young K. Short photoperiod-induced ovarian regression is mediated by apoptosis in Siberian hamsters (Phodopus sungorus). Reproduction. 2006;131:771-82 pubmed
    ..These data indicate that SD exposure rapidly induces follicular apoptosis in Siberian hamsters, which ultimately disrupts both estradiol secretion and folliculogenesis, resulting in the seasonal loss of ovarian function...
  5. Trainor B, Lin S, Finy M, Rowland M, Nelson R. Photoperiod reverses the effects of estrogens on male aggression via genomic and nongenomic pathways. Proc Natl Acad Sci U S A. 2007;104:9840-5 pubmed
    ..These data demonstrate that the environment can dictate how hormones affect a complex behavior by altering the molecular pathways targeted by steroid receptors. ..
  6. Walton J, Chen Z, Weil Z, Pyter L, Travers J, Nelson R. Photoperiod-mediated impairment of long-term potention and learning and memory in male white-footed mice. Neuroscience. 2011;175:127-32 pubmed publisher
    ..Taken together, these results demonstrate a functional change in the hippocampus in male white-footed mice induced by day length...
  7. Syrova Z, Sauman I, Giebultowicz J. Effects of light and temperature on the circadian system controlling sperm release in moth Spodoptera littoralis. Chronobiol Int. 2003;20:809-21 pubmed
    ..Nevertheless, temperature plays a critical role in the absence of light Zeitgeber. Sperm release and transfer are arrhythmic in constant light (LL); however, both rhythms are restored by temperature cycles. ..
  8. Bittman E. Timing in the Testis. J Biol Rhythms. 2016;31:12-36 pubmed publisher
    ..This review examines the periodicity of testicular function along multiple time scales. ..
  9. Murphy H, Wideman C, Nadzam G. The role of vasopressin in modulating circadian rhythm responses to phase shifts. Peptides. 1998;19:1191-208 pubmed
    ..The demonstrated role of vasopressin in synchronizing circadian rhythms to the LEO may be of significance in understanding human circadian rhythm disturbances, such as jet lag. ..
  10. Wen J, Hotchkiss A, Demas G, Nelson R. Photoperiod affects neuronal nitric oxide synthase and aggressive behaviour in male Siberian hamsters (Phodopus sungorus). J Neuroendocrinol. 2004;16:916-21 pubmed
    ..Together, these results suggest that seasonal aggression in male Siberian hamsters is regulated by photoperiod, through mechanisms that are likely independent from gonadal steroid hormones. ..
  11. Fetissov S, Meguid M. Serotonin delivery into the ventromedial nucleus of the hypothalamus affects differently feeding pattern and body weight in obese and lean Zucker rats. Appetite. 2010;54:346-53 pubmed publisher
  12. Kim D, Sung S. Role of VIN3-LIKE 2 in facultative photoperiodic flowering response in Arabidopsis. Plant Signal Behav. 2010;5:1672-3 pubmed
    ..VIL2 acts together with POLYCOMB REPRESSIVE COMPLEX 2 (PRC2) to repress MAF5 in a photoperiod dependent manner. ..
  13. Bilbo S, Nelson R. Photoperiod influences the effects of exercise and food restriction on an antigen-specific immune response in Siberian hamsters. Endocrinology. 2004;145:556-64 pubmed
    ..In sum, moderate energetic deficiency suppressed DTH in SD (but not LD) hamsters, and this suggests that hamsters may have evolved to enhance immune responses during winter in preparation for increased metabolic stressors. ..
  14. Pongratz G, Härle P, Schnellinger G, Janele D, Scholmerich J, Straub R. Norepinephrine in mice inhibits secretion of splenic IL-6 during the dark period but stimulates its secretion in the light period--possible role of the corticosterone tone. J Neuroimmunol. 2005;158:120-7 pubmed
    ..This study demonstrates that cooperation of endogenous NE and corticosterone are involved in a time-dependent fall or rise of splenic IL-6 secretion...
  15. Shahed A, Young K. Differential activity of matrix metalloproteinases (MMPs) during photoperiod induced uterine regression and recrudescence in Siberian hamsters (Phodopus sungorus). Mol Reprod Dev. 2008;75:1433-40 pubmed publisher
    ..These changes likely reflect increases in tissue remodeling during both the adaptation to SD and the restoration of reproductive function. ..
  16. Caras M, O Brien M, Brenowitz E, Rubel E. Estradiol selectively enhances auditory function in avian forebrain neurons. J Neurosci. 2012;32:17597-611 pubmed publisher
    ..These findings demonstrate that functionally distinct classes of anatomically overlapping forebrain neurons are differentially regulated by sex steroid hormones in a dose-dependent manner. ..
  17. Obermeyer W, Benca R. REM sleep in response to light and dark in congenic albino and pigmented F344 rats. Sleep Res Online. 1999;2:83-8 pubmed
    ..These results indicate that different systems are involved in regulating sleep-waking and REM sleep responses to light and further that these systems are differentially affected by alleles at (or near) the c locus and/or albinism. ..
  18. Chabot C, Kent J, Watson W. Circatidal and circadian rhythms of locomotion in Limulus polyphemus. Biol Bull. 2004;207:72-5 pubmed
  19. Zysling D, Demas G. Metabolic stress suppresses humoral immune function in long-day, but not short-day, Siberian hamsters (Phodopus sungorus). J Comp Physiol B. 2007;177:339-47 pubmed
    ..These data suggest that reductions in energy availability suppress immunity and short days buffer organisms against glucoprivation-induced immunosuppression. ..
  20. Zhang Y, Semple Rowland S. Rhythmic expression of clock-controlled genes in retinal photoreceptors is sensitive to 18-beta-glycyrrhetnic acid and 18-alpha-glycyrrhetnic acid-3-hemisuccinate. Brain Res Mol Brain Res. 2005;135:30-9 pubmed
  21. Weil Z, Martin L, Workman J, Nelson R. Immune challenge retards seasonal reproductive regression in rodents: evidence for terminal investment. Biol Lett. 2006;2:393-6 pubmed
    ..This delayed reproductive regression likely reflects a strategy to maintain reproductive function when survival prospects are compromised by infection. ..
  22. Lilley T, Wotus C, Taylor D, Lee J, de la Iglesia H. Circadian regulation of cortisol release in behaviorally split golden hamsters. Endocrinology. 2012;153:732-8 pubmed publisher
    ..This result suggests that the timing, rather than the absolute amount, of cortisol release is more critical for the induction of negative feedback effects that regulate the hypothalamo-pituitary-adrenal axis. ..
  23. Ho J, Smith N, Adams S, Bradshaw H, Demas G. Photoperiodic changes in endocannabinoid levels and energetic responses to altered signalling at CB1 receptors in Siberian hamsters. J Neuroendocrinol. 2012;24:1030-9 pubmed publisher
    ..Taken altogether, these findings demonstrate that endocannabinoid levels vary with sex and photoperiod in a site-specific manner, and that altered signalling at CB(1) receptors affects energy balance in Siberian hamsters. ..
  24. Fonken L, Kitsmiller E, Smale L, Nelson R. Dim nighttime light impairs cognition and provokes depressive-like responses in a diurnal rodent. J Biol Rhythms. 2012;27:319-27 pubmed publisher
    ..Together, these data suggest that exposure to dLAN can alter affective responses and impair cognition in a diurnal animal. ..
  25. Kubota A, Ito S, Shim J, Johnson R, Song Y, Breton G, et al. TCP4-dependent induction of CONSTANS transcription requires GIGANTEA in photoperiodic flowering in Arabidopsis. PLoS Genet. 2017;13:e1006856 pubmed publisher
    ..Taken together, our results demonstrate a novel function of CIN-TCPs as photoperiodic flowering regulators, which may contribute to coordinating plant development with flowering regulation. ..
  26. Cheng H, Papp J, Varlamova O, Dziema H, Russell B, Curfman J, et al. microRNA modulation of circadian-clock period and entrainment. Neuron. 2007;54:813-29 pubmed
    ..Collectively, these data reveal miRNAs as clock- and light-regulated genes and provide a mechanistic examination of their roles as effectors of pacemaker activity and entrainment. ..
  27. Amasino R, Michaels S. The timing of flowering. Plant Physiol. 2010;154:516-20 pubmed publisher
  28. Yang X, Wood P, Ansell C, Quiton D, Oh E, Du Quiton J, et al. The circadian clock gene Per1 suppresses cancer cell proliferation and tumor growth at specific times of day. Chronobiol Int. 2009;26:1323-39 pubmed publisher
    ..The data of the study suggest Per1 has tumor-suppressor function that diminishes cancer proliferation and tumor growth, but only at specific times of day. ..
  29. Li Z, Yu J, Kim K, Brand J. Nitrogen fixation by a marine non-heterocystous cyanobacterium requires a heterotrophic bacterial consort. Environ Microbiol. 2010;12:1185-93 pubmed publisher
    ..These observations strongly indicate that L. nodulosa contains a functional nitrogenase which is not expressed in the absence of heterotrophic bacteria. ..
  30. de la Iglesia H, Fernandez Duque E, Golombek D, Lanza N, Duffy J, Czeisler C, et al. Access to Electric Light Is Associated with Shorter Sleep Duration in a Traditionally Hunter-Gatherer Community. J Biol Rhythms. 2015;30:342-50 pubmed publisher
    ..Our field study supports the notion that access to inexpensive sources of artificial light and the ability to create artificially lit environments must have been key factors in reducing sleep in industrialized human societies. ..
  31. Kinsey S, Prendergast B, Nelson R. Photoperiod and stress affect wound healing in Siberian hamsters. Physiol Behav. 2003;78:205-11 pubmed
    ..In nature, enhanced wound healing coincident with the breeding season and territorial defense may be adaptive. ..
  32. Cyr N, Romero L. Fecal glucocorticoid metabolites of experimentally stressed captive and free-living starlings: implications for conservation research. Gen Comp Endocrinol. 2008;158:20-8 pubmed publisher
    ..Overall, our results suggest that more research is need before FGM analysis can be used as a reliable measure of stress in animals, especially those kept in captivity...
  33. Kuenzel W, Golden C. Distribution and change in number of gonadotropin-releasing hormone-1 neurons following activation of the photoneuroendocrine system in the chick, Gallus gallus. Cell Tissue Res. 2006;325:501-12 pubmed
    ..Thus, instead of the traditional descriptor hypothalamo-pituitary-gonadal axis, either the septal- or subpallial-pituitary-gonadal axis may be more appropriate for describing the neuroendocrine axis related to gonadal function in birds. ..
  34. Kelm Nelson C, Stevenson S, Cordes M, Riters L. Modulation of male song by naloxone in the medial preoptic nucleus. Behav Neurosci. 2013;127:451-7 pubmed publisher
  35. Prendergast B, Hotchkiss A, Bilbo S, Nelson R. Peripubertal immune challenges attenuate reproductive development in male Siberian hamsters (Phodopus sungorus). Biol Reprod. 2004;70:813-20 pubmed
    ..The data also underscore the importance of seasonally dependent life history factors in assessing physiological tradeoffs...
  36. Bradshaw W, Holzapfel C. What season is it anyway? Circadian tracking vs. photoperiodic anticipation in insects. J Biol Rhythms. 2010;25:155-65 pubmed publisher
    ..Finally, the authors propose that circadian-unbiased, forward genetic approaches should be used to identify genes involved in photoperiodism within extant populations and among populations over evolutionary time. ..
  37. Walton J, Weil Z, Nelson R. Influence of photoperiod on hormones, behavior, and immune function. Front Neuroendocrinol. 2011;32:303-19 pubmed publisher
    ..Thus, melatonin is the fulcrum mediating redistribution of energetic investment among physiological processes to maximize fitness and survival. ..
  38. Barnard D, Posey K, Smith D, Schreck C. Mosquito density, biting rate and cage size effects on repellent tests. Med Vet Entomol. 1998;12:39-45 pubmed
    ..The shortest MDPBs were obtained in large cages with high densities of mosquitoes and longest protection times occurred in medium sized cages with low mosquito densities. ..
  39. Gunduz B, Stetson M. A test of the coincidence and duration models of melatonin action in Siberian hamsters. II. The effects of 4- and 8-hr melatonin infusions on testicular development of pinealectomized juvenile Siberian hamsters (Phodopus sungorus). J Pineal Res. 2001;30:56-64 pubmed
    ..The duration of the melatonin signal alone can not explain the results...
  40. Weise S, Schrader S, Kleinbeck K, Sharkey T. Carbon balance and circadian regulation of hydrolytic and phosphorolytic breakdown of transitory starch. Plant Physiol. 2006;141:879-86 pubmed
    ..The redox status of the chloroplasts was found to be oxidized under conditions favoring starch degradation. ..
  41. Greives T, Humber S, Goldstein A, Scotti M, Demas G, Kriegsfeld L. Photoperiod and testosterone interact to drive seasonal changes in kisspeptin expression in Siberian hamsters (Phodopus sungorus). J Neuroendocrinol. 2008;20:1339-47 pubmed publisher
    ..Collectively, these data suggest a role for both gonadal-dependent and independent (i.e. photoperiodic) mechanisms regulating seasonal changes in kisspeptin expression in Siberian hamsters...
  42. Greives T, Mason A, Scotti M, Levine J, Ketterson E, Kriegsfeld L, et al. Environmental control of kisspeptin: implications for seasonal reproduction. Endocrinology. 2007;148:1158-66 pubmed
  43. Ruby C, Prosser R, DePaul M, Roberts R, Glass J. Acute ethanol impairs photic and nonphotic circadian phase resetting in the Syrian hamster. Am J Physiol Regul Integr Comp Physiol. 2009;296:R411-8 pubmed publisher
    ..Notably, EtOH inhibition of photic signaling is manifest through direct action in the SCN. Such actions could underlie the disruption of circadian rhythmicity associated with alcohol abuse. ..
  44. Thakare D, Kumudini S, Dinkins R. The alleles at the E1 locus impact the expression pattern of two soybean FT-like genes shown to induce flowering in Arabidopsis. Planta. 2011;234:933-43 pubmed publisher
  45. Green C, Besharse J. Tryptophan hydroxylase expression is regulated by a circadian clock in Xenopus laevis retina. J Neurochem. 1994;62:2420-8 pubmed
    ..An understanding of how the circadian clock controls tryptophan hydroxylase expression may lead to a clearer understanding of the melatonin biosynthetic pathway, and possibly the clock itself. ..
  46. Pyter L, Nelson R. Enduring effects of photoperiod on affective behaviors in Siberian hamsters (Phodopus sungorus). Behav Neurosci. 2006;120:125-34 pubmed
    ..The persistence of photoperiod-induced affective behaviors in rodents supports the hypothesis that symptoms of human affective disorders may reflect ancestral adaptations to seasonal environments...
  47. Scotti M, Belén J, Jackson J, Demas G. The role of androgens in the mediation of seasonal territorial aggression in male Siberian hamsters (Phodopus sungorus). Physiol Behav. 2008;95:633-40 pubmed publisher
    ..Further, seasonal changes in territorial aggression appear independent of circulating levels of DHEA in Siberian hamsters. ..
  48. Duncan M, Deveraux A. Age-related changes in circadian responses to dark pulses. Am J Physiol Regul Integr Comp Physiol. 2000;279:R586-90 pubmed
    ..These results suggest that, although aging does not reduce the sensitivity of the circadian pacemaker to this nonphotic signal, it alters one property of the pacemaker, i.e., the flexibility of the coupling of its component oscillators...
  49. Fonken L, Haim A, Nelson R. Dim light at night increases immune function in Nile grass rats, a diurnal rodent. Chronobiol Int. 2012;29:26-34 pubmed publisher
    ..Overall, these results indicate nighttime light affects immune parameters in a diurnal rodent. ..
  50. Shafer O, Rosbash M, Truman J. Sequential nuclear accumulation of the clock proteins period and timeless in the pacemaker neurons of Drosophila melanogaster. J Neurosci. 2002;22:5946-54 pubmed
    ..The differing profiles of TIM and PER nuclear accumulation suggest that PER and TIM have distinct functions in the nuclei of vLNs. ..
  51. Li H, Kuenzel W. A possible neural cascade involving the photoneuroendocrine system (PNES) responsible for regulating gonadal development in an avian species, Gallus gallus. Brain Res Bull. 2008;76:586-96 pubmed publisher
    ..Additionally, VIP released from the LSO may modulate GnRH-1 neurons in the NCPa via VIP receptors by increasing GnRH-1 gene expression. ..
  52. Brager A, Ruby C, Prosser R, Glass J. Acute ethanol disrupts photic and serotonergic circadian clock phase-resetting in the mouse. Alcohol Clin Exp Res. 2011;35:1467-74 pubmed publisher
    ..Such actions by ethanol could underlie the disruptive effects of alcohol abuse on behavioral, physiological, and endocrine rhythms associated with alcoholism. ..
  53. Hoadley K, Szmant A, Pyott S. Circadian clock gene expression in the coral Favia fragum over diel and lunar reproductive cycles. PLoS ONE. 2011;6:e19755 pubmed publisher
    ..fragum. Our results suggest a molecular clock mechanism, potentially similar to that in described in fruit flies, exists within F. fragum. ..
  54. Workman J, Manny N, Walton J, Nelson R. Short day lengths alter stress and depressive-like responses, and hippocampal morphology in Siberian hamsters. Horm Behav. 2011;60:520-8 pubmed publisher
    ..This study is the first to investigate hippocampal changes in the context of short-day induced immobility and may be relevant for understanding psychological disorders with a seasonal component. ..
  55. Wolff G, Esser K. Scheduled exercise phase shifts the circadian clock in skeletal muscle. Med Sci Sports Exerc. 2012;44:1663-70 pubmed publisher
  56. Cao R, Butcher G, Karelina K, Arthur J, Obrietan K. Mitogen- and stress-activated protein kinase 1 modulates photic entrainment of the suprachiasmatic circadian clock. Eur J Neurosci. 2013;37:130-40 pubmed publisher
    ..Together, these data provide key new insights into the molecular mechanisms by which MSK1 affects the SCN clock. ..
  57. Wilson B, Matt K, Morris J, Sasser L, Miller D, Anderson L. Effects of 60 Hz magnetic field exposure on the pineal and hypothalamic-pituitary-gonadal axis in the Siberian hamster (Phodopus sungorus). Bioelectromagnetics. 1999;20:224-32 pubmed
    ..This difference was statistically significant (P < .05) after 42 days of exposure. These data indicate that both one-time and repeated exposure to a 0.1 mT, 60 Hz MF can give rise to neuroendocrine responses in Phodopus. ..
  58. Martin L, Navara K, Bailey M, Hutch C, Powell N, Sheridan J, et al. Food restriction compromises immune memory in deer mice (Peromyscus maniculatus) by reducing spleen-derived antibody-producing B cell numbers. Physiol Biochem Zool. 2008;81:366-72 pubmed publisher
    ..These results further indicate that maintenance of immune memory is expensive and may be subject to trade-offs with other physiological processes. ..
  59. Rathinam T, Kuenzel W. Attenuation of gonadal response to photostimulation following ablation of neurons in the lateral septal organ of chicks. Brain Res Bull. 2005;64:455-61 pubmed
    ..05). Results suggest that neurons in the LSO may be directly involved in responding to long photoperiods and stimulating gonadal development in broiler chicks. ..
  60. Emerson K, Bradshaw W, Holzapfel C. Microarrays reveal early transcriptional events during the termination of larval diapause in natural populations of the mosquito, Wyeomyia smithii. PLoS ONE. 2010;5:e9574 pubmed publisher
  61. Grossberg A, Zhu X, Leinninger G, Levasseur P, Braun T, Myers M, et al. Inflammation-induced lethargy is mediated by suppression of orexin neuron activity. J Neurosci. 2011;31:11376-86 pubmed publisher
    ..This work defines a specific population of inflammation-sensitive, arousal-associated Ox neurons and identifies a proximal neural target for inflammatory signaling to Ox neurons, while eliminating several others. ..
  62. Demas G, Bartness T, Nelson R, Drazen D. Photoperiod modulates the effects of norepinephrine on lymphocyte proliferation in Siberian hamsters. Am J Physiol Regul Integr Comp Physiol. 2003;285:R873-9 pubmed
    ..Collectively, these results provide further support that photoperiodic changes in immunity are influenced by changes in SNS activity. ..
  63. Amasino R. Seasonal and developmental timing of flowering. Plant J. 2010;61:1001-13 pubmed publisher
    ..Arabidopsis research has contributed greatly to understanding these systems at a molecular level. ..
  64. Padilla S, Hunter D, Padnos B, Frady S, MacPhail R. Assessing locomotor activity in larval zebrafish: Influence of extrinsic and intrinsic variables. Neurotoxicol Teratol. 2011;33:624-30 pubmed publisher
    ..Zebrafish larval behavior using a microtiter plate format may be an ideal endpoint for screening developmentally neurotoxic chemicals, but it is imperative that many test variables be carefully specified and controlled. ..
  65. Kawazoe R, Mahan K, Venghaus B, Carter M, Herrin D. Circadian regulation of chloroplast transcription in Chlamydomonas is accompanied by little or no fluctuation in RPOD levels or core RNAP activity. Mol Biol Rep. 2012;39:10565-71 pubmed publisher
    ..The implications of this data for hypotheses that purport to explain the circadian control mechanism are discussed...
  66. Prendergast B, Bilbo S, Dhabhar F, Nelson R. Effects of photoperiod history on immune responses to intermediate day lengths in Siberian hamsters (Phodopus sungorus). J Neuroimmunol. 2004;149:31-9 pubmed
    ..The data suggest that photoperiodic mechanisms that enhance and suppress several aspects of immunity in young-adult hamsters are not responsive to prenatally communicated photoperiod history information. ..
  67. Einat H, Kronfeld Schor N, Eilam D. Sand rats see the light: short photoperiod induces a depression-like response in a diurnal rodent. Behav Brain Res. 2006;173:153-7 pubmed
    ..g., SAD), which in humans is a prevalent disorder, with winter depression episodes and spring/summer remissions. ..
  68. Yang X, Wood P, Ansell C, Hrushesky W. Circadian time-dependent tumor suppressor function of period genes. Integr Cancer Ther. 2009;8:309-16 pubmed publisher
    ..These data suggest that the therapeutic efficacy of antiproliferation agents depends on the time of day of drug delivery. The optimal times of day may be shifted in tumors that have mutant Period genes. ..
  69. Liang J, Abata K, Bachelder E, Bartley B, Bozadjieva N, Caskey V, et al. Original research in the classroom: why do zebrafish spawn in the morning?. Zebrafish. 2011;8:191-202 pubmed publisher
    ..Our successes and failures carrying out original research as part of an undergraduate course should contribute to the growing approaches for using zebrafish to bring the excitement of experimental science to the classroom. ..
  70. DeAndrade M, Johnson R, Unger E, Zhang L, van Groen T, Gamble K, et al. Motor restlessness, sleep disturbances, thermal sensory alterations and elevated serum iron levels in Btbd9 mutant mice. Hum Mol Genet. 2012;21:3984-92 pubmed publisher
    ..Finally, our data argue for the utility of Btbd9 mutant mice to discover and screen novel therapeutics for RLS. ..
  71. Gunduz B, Stetson M. A test of the coincidence and duration models of melatonin action in Siberian hamsters: the effects of 1-hr melatonin infusions on testicular development in intact and pinealectomized prepubertal Phodopus sungorus. J Pineal Res. 2001;30:97-107 pubmed
  72. Swoap S. Altered leptin signaling is sufficient, but not required, for hypotension associated with caloric restriction. Am J Physiol Heart Circ Physiol. 2001;281:H2473-9 pubmed
    ..These data suggest that at least two pathways are involved with cardiovascular effects of caloric restriction: one dependent on leptin signaling and the other independent of the leptin axis...
  73. Salome P, To J, Kieber J, McClung C. Arabidopsis response regulators ARR3 and ARR4 play cytokinin-independent roles in the control of circadian period. Plant Cell. 2006;18:55-69 pubmed
    ..Therefore, ARR3 and ARR4 are critical for proper circadian period and define an additional level of regulation of the circadian clock in Arabidopsis. ..
  74. Watson W, Bedford L, Chabot C. Rhythms of locomotion expressed by Limulus polyphemus, the American horseshoe crab: II. Relationship to circadian rhythms of visual sensitivity. Biol Bull. 2008;215:46-56 pubmed
    ..This arrangement allows horseshoe crabs to see quite well while mating during both daytime and nighttime high tides...
  75. Davis C, Clinton J, Krueger J. MicroRNA 138, let-7b, and 125a inhibitors differentially alter sleep and EEG delta-wave activity in rats. J Appl Physiol (1985). 2012;113:1756-62 pubmed publisher
  76. Prendergast B, Mosinger B, Kolattukudy P, Nelson R. Hypothalamic gene expression in reproductively photoresponsive and photorefractory Siberian hamsters. Proc Natl Acad Sci U S A. 2002;99:16291-6 pubmed
  77. Lewy A, Emens J, Bernert R, Lefler B. Eventual entrainment of the human circadian pacemaker by melatonin is independent of the circadian phase of treatment initiation: clinical implications. J Biol Rhythms. 2004;19:68-75 pubmed
    ..Therefore, it is not essential that circadian phase be ascertained before starting low-dose melatonin treatment of blind people. ..
  78. Mishra M, Wilson F, Scanlan T, Chiellini G. Thyroid hormone-dependent seasonality in American tree sparrows (Spizella arborea): effects of GC-1, a thyroid receptor beta-selective agonist, and of iopanoic acid, a deiodinase inhibitor. J Comp Physiol B. 2004;174:471-9 pubmed
    ..Because IOP augmented the photoperiodic testicular response in T3-treated THX birds, T3 may act either independently or co-dependently with T4 in programming vernal seasonal events. ..
  79. Hill W, Bassi K, Bonaventura L, Sacus J. Prehatch entrainment of circadian rhythms in the domestic chick using different light regimes. Dev Psychobiol. 2004;45:174-86 pubmed
    ..The onset of entrainment is earlier than predicted and suggests that the brain structures mediating circadian rhythms mature sooner than proposed by previous research. ..
  80. Doyle M, Bizzell C, Keller M, Michaels S, Song J, Noh Y, et al. HUA2 is required for the expression of floral repressors in Arabidopsis thaliana. Plant J. 2005;41:376-85 pubmed
    ..hua2 mutations suppress late flowering by reducing the expression of several MADS genes that act as floral repressors including FLOWERING LOCUS C (FLC ) and FLOWERING LOCUS M (FLM ). ..
  81. Pyter L, Hotchkiss A, Nelson R. Photoperiod-induced differential expression of angiogenesis genes in testes of adult Peromyscus leucopus. Reproduction. 2005;129:201-9 pubmed
  82. Trainor B, Martin L, Greiwe K, Kuhlman J, Nelson R. Social and photoperiod effects on reproduction in five species of Peromyscus. Gen Comp Endocrinol. 2006;148:252-9 pubmed
  83. Griffith T, Watson M. Is evolution necessary for range expansion? Manipulating reproductive timing of a weedy annual transplanted beyond its range. Am Nat. 2006;167:153-64 pubmed
    ..These results suggest that relatively few traits may limit a species' range and that identifying evolutionary constraints on such traits could be important for predicting geographic distribution. ..
  84. Xu X, Rose A, Muthuswamy S, Jeong S, Venkatakrishnan S, Zhao Q, et al. NUCLEAR PORE ANCHOR, the Arabidopsis homolog of Tpr/Mlp1/Mlp2/megator, is involved in mRNA export and SUMO homeostasis and affects diverse aspects of plant development. Plant Cell. 2007;19:1537-48 pubmed
  85. Salome P, Xie Q, McClung C. Circadian timekeeping during early Arabidopsis development. Plant Physiol. 2008;147:1110-25 pubmed publisher
    ..A circadian clock entrainable by temperature cycles in germinating etiolated seedlings may synchronize the buried seedling with the local daily cycles before emergence from the soil and exposure to light. ..
  86. Kim S, Yu X, Michaels S. Regulation of CONSTANS and FLOWERING LOCUS T expression in response to changing light quality. Plant Physiol. 2008;148:269-79 pubmed publisher
  87. Workman J, Bowers S, Nelson R. Enrichment and photoperiod interact to affect spatial learning and hippocampal dendritic morphology in white-footed mice (Peromyscus leucopus). Eur J Neurosci. 2009;29:161-70 pubmed publisher
    ..These results suggest that day length and other non-photic environmental factors interact to regulate dendritic morphology, and that short photoperiods do not constrain the capacity for functional neural plasticity...
  88. Navara K, Workman J, Oberdick J, Nelson R. Short day lengths skew prenatal sex ratios toward males in Siberian hamsters. Physiol Biochem Zool. 2010;83:127-34 pubmed publisher
    ..Thus, photoperiod functions as an effective seasonal cue, stimulating sex ratio skews toward males when day lengths are short. ..
  89. Mahoney C, Brewer D, Costello M, Brewer J, Bittman E. Lateralization of the central circadian pacemaker output: a test of neural control of peripheral oscillator phase. Am J Physiol Regul Integr Comp Physiol. 2010;299:R751-61 pubmed publisher
    ..Our results indicate that neural pathways contribute to, but cannot completely account for, SCN regulation of the phase of peripheral oscillators...
  90. Mulekar J, Bu Q, Chen F, Huq E. Casein kinase II ? subunits affect multiple developmental and stress-responsive pathways in Arabidopsis. Plant J. 2012;69:343-54 pubmed publisher
    ..Moreover, CK2 ? subunit mutants are also hyposensitive to a NaCl-induced blockage of seed germination. Taken together, these data suggest that CK2 ? subunits affect diverse developmental and stress responsive pathways in Arabidopsis. ..
  91. Hutchinson A, Hudson R, Dubocovich M. Genetic deletion of MT(1) and MT(2) melatonin receptors differentially abrogates the development and expression of methamphetamine-induced locomotor sensitization during the day and the night in C3H/HeN mice. J Pineal Res. 2012;53:399-409 pubmed publisher
    ..We suggest that MT(1) and MT(2) melatonin receptors are potential targets for pharmacotherapeutic intervention in METH abusers. ..
  92. Ream T, Woods D, Amasino R. The molecular basis of vernalization in different plant groups. Cold Spring Harb Symp Quant Biol. 2012;77:105-15 pubmed publisher
    ..We also discuss the advantages of using Brachypodium as a model system to study flowering and vernalization in the Pooids. Finally, we discuss the evolution and function of the Ghd7/VRN2 gene family in grasses. ..