• R Subbaraj

      Articles written in Proceedings – Animal Sciences

    • Seasonal changes in the timing of hopping and feeding activities of a tropical bird (Estrilda amandava) under natural photoperiod

      P Subramanian R Subbaraj

      More Details Abstract Fulltext PDF

      The timings of onset and end of hopping and feeding activities of the birdEstrilda amandava, were studied under natural light-dark cycles and they are found to keep pace with the timings of sunrise and sunset. The onsets of hopping and feeding occurred at different timings of twilight and they vary over the seasons. The phase angle difference (ψ) of hopping always shows a considerable phase lead relative to feeding which also varies over the seasons and thus suggests that there may be two endogenous oscillators, one responsible for hopping and the other for feeding.

    • Effect of imipramine and amitriptyline on circadian locomotor activity rhythm in the field mouseMus booduga

      P Subramanian R Subbaraj

      More Details Abstract Fulltext PDF

      We have performed experiments on the influence of imipramine and amitriptyline (antidepressant drugs) offered through drinking water on the period length (τ) of the circadian locomotor activity rhythm in the field mouseMus booduga under continuous darkness (DD). Ingestion of imipramine to mice under freemnning conditions caused lengthening of the activity rhythm whereas amitriptyline caused dissociation of activity components. Furthermore, the amount of activity (α) is significantly reduced (P< 0-005) during imipramine as well as amitriptyline treatment. The action of these antidepressants may be explained by their action on serotonergic terminals in the suprachiasmatic nucleus, the putative circadian pacemaker in mammals.

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