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  1. Research

    Effects of restraint stress on the daily rhythm of hydrolysis of adenine nucleotides in rat serum

    Adenosine 5-triphosphate (ATP) and its breakdown products ADP and adenosine can act as extracellular messengers in a range of biological processes. Extracellular adenine nucleotides are metabolized by a number...

    Andressa Souza, Bernardo C Detanico, Liciane F Medeiros, Joanna R Rozisky, Wolnei Caumo, Maria Paz L Hidalgo, Ana Maria O Battastini and Iraci LS Torres

    Journal of Circadian Rhythms 2011 9:7

    Published on: 28 July 2011

  2. Research

    Validation of actigraphy to assess circadian organization and sleep quality in patients with advanced lung cancer

    Many cancer patients report poor sleep quality, despite having adequate time and opportunity for sleep. Satisfying sleep is dependent on a healthy circadian time structure and the circadian patterns among canc...

    James F Grutsch, Patricia A Wood, Jovelyn Du-Quiton, Justin L Reynolds, Christopher G Lis, Robert D Levin, Mary Ann Daehler, Digant Gupta, Dinah Faith T Quiton and William JM Hrushesky

    Journal of Circadian Rhythms 2011 9:4

    Published on: 18 May 2011

  3. Short paper

    Effects of saliva collection using cotton swabs on melatonin enzyme immunoassay

    Although various acceptable and easy-to-use devices have been used for saliva collection, cotton swabs are among the most common ones. Previous studies reported that cotton swabs yield a lower level of melaton...

    Tomoaki Kozaki, Soomin Lee, Takayuki Nishimura, Tetsuo Katsuura and Akira Yasukouchi

    Journal of Circadian Rhythms 2011 9:1

    Published on: 10 January 2011

  4. Research

    Statistical methods for detecting and comparing periodic data and their application to the nycthemeral rhythm of bodily harm: A population based study

    Animals, including humans, exhibit a variety of biological rhythms. This article describes a method for the detection and simultaneous comparison of multiple nycthemeral rhythms.

    Armin M Stroebel, Matthias Bergner, Udo Reulbach, Teresa Biermann, Teja W Groemer, Ingo Klein and Johannes Kornhuber

    Journal of Circadian Rhythms 2010 8:10

    Published on: 8 November 2010

  5. Debate

    Evidence of circadian rhythms in non-photosynthetic bacteria?

    Examples of circadian rhythms have been described in eukaryotic organisms and in photosynthetic bacteria, but direct proof of their existence in other prokaryotes is limited and has been largely ignored. The a...

    María I Soriano, Begoña Roibás, Ana B García and Manuel Espinosa-Urgel

    Journal of Circadian Rhythms 2010 8:8

    Published on: 16 September 2010

  6. Research

    Insomnia in chronic renal patients on dialysis in Saudi Arabia

    Studies have shown that insomnia is a common sleep disorder among patients with end-stage renal disease (ESRD). This study aimed to assess the prevalence of insomnia in Saudi patients with ESRD who are on main...

    Hamdan H Al-Jahdali, Haithm A Khogeer, Waleed A Al-Qadhi, Salim Baharoon, Hani Tamim, Fayez F Al-Hejaili, Saeed M Al-Ghamdi and Abdullah A Al-Sayyari

    Journal of Circadian Rhythms 2010 8:7

    Published on: 14 June 2010

  7. Research

    Aging related changes of circadian rhythmicity of cytotoxic lymphocyte subpopulations

    Immunosenescence is a process that affects all cell compartments of the immune system and the contribution of the immune system to healthy aging and longevity is still an open question. Lymphocyte subpopulatio...

    Gianluigi Mazzoccoli, Angelo De Cata, Antonio Greco, Marcello Damato, Nunzia Marzulli, Mariangela Pia Dagostino, Stefano Carughi, Federico Perfetto and Roberto Tarquini

    Journal of Circadian Rhythms 2010 8:6

    Published on: 25 May 2010

  8. Research

    Weak evidence of bright light effects on human LH and FSH

    Most mammals are seasonal breeders whose gonads grow to anticipate reproduction in the spring and summer. As day length increases, secretion increases for two gonadotropins, luteinizing hormone (LH) and follic...

    Daniel F Kripke, Jeffrey A Elliott, Shawn D Youngstedt, Barbara L Parry, Richard L Hauger and Katharine M Rex

    Journal of Circadian Rhythms 2010 8:5

    Published on: 11 May 2010

  9. Research

    "Time sweet time": circadian characterization of galectin-1 null mice

    Recent evidence suggests a two-way interaction between the immune and circadian systems. Circadian control of immune factors, as well as the effect of immunological variables on circadian rhythms, might be key...

    Leandro P Casiraghi, Diego O Croci, Francoise Poirier, Gabriel A Rabinovich and Diego A Golombek

    Journal of Circadian Rhythms 2010 8:4

    Published on: 19 April 2010

  10. Review

    Circadian rhythm and its role in malignancy

    Circadian rhythms are daily oscillations of multiple biological processes directed by endogenous clocks. The circadian timing system comprises peripheral oscillators located in most tissues of the body and a c...

    Sobia Rana and Saqib Mahmood

    Journal of Circadian Rhythms 2010 8:3

    Published on: 31 March 2010

  11. Review

    Circadian light

    The present paper reflects a work in progress toward a definition of circadian light, one that should be informed by the thoughtful, century-old evolution of our present definition of light as a stimulus for t...

    Mark S Rea, Mariana G Figueiro, Andrew Bierman and John D Bullough

    Journal of Circadian Rhythms 2010 8:2

    Published on: 13 February 2010

  12. Research

    CLOCK is suggested to associate with comorbid alcohol use and depressive disorders

    Depression and alcohol abuse or dependence (AUD) co-occur in the general population more frequently than expected by chance. Alcohol use influences the circadian rhythms generated by the central pacemaker in t...

    Louise K Sjöholm, Leena Kovanen, Sirkku T Saarikoski, Martin Schalling, Catharina Lavebratt and Timo Partonen

    Journal of Circadian Rhythms 2010 8:1

    Published on: 21 January 2010

  13. Research

    Impact of oral melatonin on the electroretinogram cone response

    In the eye, melatonin plays a role in promoting light sensitivity at night and modulating many aspects of circadian retinal physiology. It is also an inhibitor of retinal dopamine, which is a promoter of day v...

    Anne-Marie Gagné, Konstantin V Danilenko, Serge G Rosolen and Marc Hébert

    Journal of Circadian Rhythms 2009 7:14

    Published on: 19 November 2009

  14. Research

    Restless Legs Syndrome in shift workers: A cross sectional study on male assembly workers

    Restless Legs Syndrome (RLS) is a common neurological movement disorder characterized by symptoms that follow a circadian pattern. Night and rotating shift work schedules exert adverse effects on functions of ...

    Akbar Sharifian, Marjan Firoozeh, Gholamreza Pouryaghoub, Mehran Shahryari, Mohsen Rahimi, Mohammad Hesamian and Ali Fardi

    Journal of Circadian Rhythms 2009 7:12

    Published on: 14 September 2009

  15. Review

    Food anticipation in Bmal1-/- and AAV-Bmal1 rescued mice: a reply to Fuller et al

    Evidence that circadian food-anticipatory activity and temperature rhythms are absent in Bmal1 knockout mice and rescued by restoration of Bmal1 expression selectively in the dorsomedial hypothalamus was publishe...

    Ralph E Mistlberger, Ruud M Buijs, Etienne Challet, Carolina Escobar, Glenn J Landry, Andries Kalsbeek, Paul Pevet and Shigenobu Shibata

    Journal of Circadian Rhythms 2009 7:11

    Published on: 10 August 2009

  16. Research

    A possible connection between psychosomatic symptoms and daily rhythmicity in growth hormone secretion in healthy Japanese students

    Students suffering from psychosomatic symptoms, including drowsiness and feelings of melancholy, often have basic lifestyle problems. The aim of this study was to investigate whether psychosomatic complaints m...

    Mitsuo Nagane, Kazunori Yoshimura, Shu-Ichi Watanabe and Masahiko Nomura

    Journal of Circadian Rhythms 2009 7:10

    Published on: 5 August 2009

  17. Review

    Standards of evidence in chronobiology: A response

    A number of recent studies have debated the existence and nature of clocks outside the suprachiasmatic nucleus that may underlie circadian rhythms in conditions of food entrainment or methamphetamine administr...

    Patrick M Fuller, Jun Lu and Clifford B Saper

    Journal of Circadian Rhythms 2009 7:9

    Published on: 22 July 2009

  18. Research

    Phase delaying the human circadian clock with a single light pulse and moderate delay of the sleep/dark episode: no influence of iris color

    Light exposure in the late evening and nighttime and a delay of the sleep/dark episode can phase delay the circadian clock. This study assessed the size of the phase delay produced by a single light pulse comb...

    Jillian L Canton, Mark R Smith, Ho-Sun Choi and Charmane I Eastman

    Journal of Circadian Rhythms 2009 7:8

    Published on: 17 July 2009

  19. Research

    Determinants of the daily rhythm of blood fluidity

    Numerous processes in the living body exhibit daily rhythmicity. In this study, we characterized a daily rhythm of blood fluidity and identified its determinants.

    Tatsushi Kimura, Tsutomu Inamizu, Kiyokazu Sekikawa, Masayuki Kakehashi and Kiyoshi Onari

    Journal of Circadian Rhythms 2009 7:7

    Published on: 26 June 2009

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