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Journal of Circadian Rhythms


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  1. Content type: Research

    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...

    Authors: 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

    Citation: Journal of Circadian Rhythms 2011 9:7

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  2. Content type: Research

    The role played by calcium as a regulator of circadian rhythms is not well understood. The effect of the pharmacological inhibition of the ryanodine receptor (RyR), inositol 1,4,5-trisphosphate receptor (IP3R), a...

    Authors: Adrián Báez-Ruiz and Mauricio Díaz-Muñoz

    Citation: Journal of Circadian Rhythms 2011 9:6

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  3. Content type: Research

    Sodium nitroprusside (SNP) is widely used in pharmacological studies as a potent vasodilator or a nitric oxide donor. SNP-induced ataxic effects were assessed in mice by the Joulou-Couvoisier test. Swiss albin...

    Authors: Mamane Sani, Hichem Sebai, Naceur A Boughattas and Mossadok Ben-Attia

    Citation: Journal of Circadian Rhythms 2011 9:5

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  4. Content type: Research

    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...

    Authors: 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

    Citation: Journal of Circadian Rhythms 2011 9:4

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  5. Content type: Research

    Although most freshwater planarias are well known photonegative organisms, their diel rhythms have never been quantified. Differences in daily activity rhythms may be particularly important for temperate-clima...

    Authors: Paola Lombardo, Marco Giustini, Francesco Paolo Miccoli and Bruno Cicolani

    Citation: Journal of Circadian Rhythms 2011 9:2

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  6. Content type: Short paper

    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...

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

    Citation: Journal of Circadian Rhythms 2011 9:1

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  7. Content type: Research

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

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

    Citation: Journal of Circadian Rhythms 2010 8:10

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  8. Content type: Debate

    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...

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

    Citation: Journal of Circadian Rhythms 2010 8:8

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  9. Content type: Research

    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...

    Authors: 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

    Citation: Journal of Circadian Rhythms 2010 8:7

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  10. Content type: Research

    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...

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

    Citation: Journal of Circadian Rhythms 2010 8:6

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  11. Content type: Research

    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...

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

    Citation: Journal of Circadian Rhythms 2010 8:5

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  12. Content type: Research

    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...

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

    Citation: Journal of Circadian Rhythms 2010 8:4

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  13. Content type: Review

    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...

    Authors: Sobia Rana and Saqib Mahmood

    Citation: Journal of Circadian Rhythms 2010 8:3

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  14. Content type: Review

    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...

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

    Citation: Journal of Circadian Rhythms 2010 8:2

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  15. Content type: Research

    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...

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

    Citation: Journal of Circadian Rhythms 2010 8:1

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  16. Content type: Research

    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...

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

    Citation: Journal of Circadian Rhythms 2009 7:14

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  17. Content type: Research

    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 ...

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

    Citation: Journal of Circadian Rhythms 2009 7:12

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  18. Content type: Review

    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...

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

    Citation: Journal of Circadian Rhythms 2009 7:11

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  19. Content type: Research

    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...

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

    Citation: Journal of Circadian Rhythms 2009 7:10

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  20. Content type: Review

    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...

    Authors: Patrick M Fuller, Jun Lu and Clifford B Saper

    Citation: Journal of Circadian Rhythms 2009 7:9

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  21. Content type: Research

    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...

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

    Citation: Journal of Circadian Rhythms 2009 7:8

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  22. Content type: Research

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

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

    Citation: Journal of Circadian Rhythms 2009 7:7

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