Faculty publications (EIBU): Recent submissions

Now showing items 41-60 of 98

Precision of a Mammalian Circadian Clock

Sharma, Vijay Kumar; Chandrashekaran, Maroli K (Springer-Verlag, 1999-07)

This paper reports study of day-to-day instability in the locomotor activity rhythm of the nocturnal field mouse Mus booduga. The free-running period ( tau) of this rhythm was estimated in constant darkness in n=347 adult ...
Presence Of Circadian Rhythms In The Locomotor Activity Of A Cave-Dwelling Millipede Glyphiulus Cavernicolus Sulu (Cambalidae, Spirostreptida)

Koilraj, A John; Sharma, Vijay Kumar; Marimuthu, G; Chandrashekaran, M K (Marcel Dekker Inc, 2000)

The locomotor activity of the millipede Glyphiulus cavernicolus (Spirostreptida), which occupies the deeper recesses of a cave, was monitored in light-dark (LD) cycles (12h light and 12h darkness), constant darkness (DD), ...
Persistence of Oviposition Rhythm in Individuals of Drosophila melanogaster Reared in an Aperiodic Environment for Several Hundred Generations

Sheeba, V; Chandrashekaran, M K; Joshi, Amitabh; Sharma, Vijay Kumar (Wiley-Liss, 2001-09-15)

The oviposition rhythm of individual flies of Drosophila melanogaster from a population maintained in an aperiodic environment (with light, temperature, humidity, and other factors which could provide time cues, kept ...
Do Biological clocks Age like their owners

Sharma, Vijay Kumar (Proceedings of Indian National Science Academy, 2001)
Circadian phase and period responses to light stimuli in two nocturnal rodents

Sharma, Vijay Kumar; Daan, Serge (Marcel Dekker Inc, 2002)

We report period response curves (tauRC) for two nocturnal Murid species from India, Mus booduga and Mus platythrix. We further discuss the method of phase shift estimation in the presence of tau-changes, because such ...
Biological clocks: mechanisms and developments

Nongkynrih, Phlisdamon; Sharma, Vijay Kumar (Elsevier Science Sa Lausanne, 1992-05-15)

Almost all organisms ranging from unicellular protists to mammals were found to show biological rhythms. Many workers have performed various kinds of experiment to understand the mechanism as well as to find the origin of ...
Locomotor activity rhythm in Drosophila melanogaster after 600 generations in an aperiodic environment

Sheeba, V; Chandrashekaran, M K; Joshi, Amitabh; Sharma, Vijay Kumar (Springer-Verlag, 2002-11)

The locomotor activity rhythm of flies from four populations of Drosophila melanogaster, maintained under constant light for more than 600 generations, was recorded in continuous light (LL) and continuous darkness (DD) ...
Light-Induced Phase Response Curves Of The Circadian Activity Rhythm In Individual Field Mice, Mus Booduga

Sharma, Vijay Kumar (Marcel Dekker Inc, 1996)

The circadian rhythm of locomotor activity of the field mouse Musbooduga was studied and single animal phase response curves (PRCs) (n = 8) were constructed for 15-min daylight pulses of 1000 lux intensity. The light pulses, ...
Entrainment of Eclosion Rhythm in Drosophila melanogaster Populations Reared for More Than 700 Generations in Constant Light Environment

Paranjpe, Dhanashree A; Anitha, D; Kumar, Shailesh; Kumar, Dhanya; Verkhedkar, Ketki; Chandrashekaran, M K; Joshi, Amitabh; Sharma, Vijay Kumar (Marcel Dekker Inc, 2003)

In this paper, we report the results of our extensive study on eclosion rhythm of four independent populations of Drosophila melanogaster that were reared in constant light (LL) environment of the laboratory for more than ...
Rapid Phase Resetting Of A Mammalian Circadian Rhythm By Brief Light Pulses

Sharma, Vijay Kumar; Chandrashekaran, Maroli K (Marcel Dekker Inc, 1997)

The phase-shift (Delta phi) responses of the circadian rhythm in the field mouse Mus booduga to brief light pulses (LPs) of 15 minutes duration and 1000 lux intensity were measured in 90 experiments. Tn each experiment, a ...
Period Responses to Zeitgeber Signals Stabilize Circadian Clocks During Entrainment

Sharma, Vijay Kumar (Marcel Dekker Inc, 2003)

Circadian clocks with characteristic period (tau) can be entrained to light/dark (LD) cycles by means of (i) phase shifts which are due to D/L "dawn" and/or L/D "dusk" transitions, (ii) period changes associated with ...
Adaptive Significance of Circadian Clocks

Sharma, V K (Marcel Dekker Inc, 2003)

Cireadian clocks are ubiquitous and are found in organisms ranging from bacteria to mammals. This ubiquity of occurrence implies adaptive significance, but to date there has been no rigorous empirical evidence to support ...
Entrainment Properties of the Circadian Locomotor Activity Rhythm of the Field Mouse Mus booduga under Complete and Skeleton Photoperiodic Regimes

Sharma, V K; Geetha, L; Chandrashekaran, M K (Swets Zeitlinger, 1998-07)

Predictions for the phase angle differences (psi) between the activity rhythm and the zeitgeber for different skeleton photoperiods based on the phase response curve (PRC) and the free-running period (tau) of the field ...
Melatonin Enhances the Sensitivity of Circadian Pacemakers to Light in the Nocturnal Field Mouse Mus booduga

Sharma, Vijay Kumar; Chidambaram, R; Yadunandam, A Kasin (Wiley-Liss, 2003-06-01)

The effect of exogenous melatonin (1 mg/kg) on light pulse (LP) induced phase shifts of the circadian locomotor activity rhythm was studied in the nocturnal field mouse Mus booduga. Three phase response curves (PRCs: LP, ...
Light-Dependent Changes in the Leaflet Movement Rhythm of the Plant Desmodium gyrans

Sharma, Vijay Kumar; Bardal, Tom Kristian; Johnsson, Anders (Verlag Z Naturforsch, 2003-02)

The movements of the lateral leaflets of the Indian telegraph plant Desmodium gyrans (L. F.) DC, have earlier been studied in detail with regards to the effects of chemicals, DC currents, and static magnetic fields. In the ...
Ultraviolet-light-evoked phase shifts in the locomotor activity rhythm of the field mouse Mus booduga

Sharma, V K; Chandrashekaran, M K; Singaravel, M; Subbaraj, R (Elsevier Science Ltd, 1998-09)

The circadian rhythm of locomotor activity in the nocturnal field mouse Mus booduga has been monitored after an exposure to ultraviolet-A (UV-h; wavelength between 350 and 400 nm) radiation at various hours of the subject's ...
Entrainment of Circadian Locomotor Activity Rhythm of the Nocturnal Field Mouse Mus booduga Using Daily Injections of Melatonin

Sharma, Vijay Kumar; Chidambaram, R (Wiley-Liss, 2003-03-01)

In this paper, we report the effects of daily injections of melatonin on the locomotor activity rhythm of the nocturnal field mouse Mus booduga. The locomotor activity rhythm of 45 animals was first monitored in constant ...
Locomotor Activity Rhythm in the Field Mouse Mus booduga Phase-shifts to Melatonin Injections in a Dose-dependent Manner

Sharma, Vijay Kumar; Singaravel, M; Subbaraj, R; Chandrashekaran, M K (Swets & Zeitlinger, 1999-07)

Melatonin is known to shift the phase of the locomotor activity rhythm in the field mouse Mus booduga in accordance with a type-I phase response curve (PRC), with phase delays during the subjective day and phase advances ...
Effect of Behavioural Feedback on Circadian Clocks of the Nocturnal Field Mouse Mus booduga

Chidambarama, R; Marimuthu, G; Sharma, Vijay Kumar (Taylor & Francis Ltd, 2004-07)

The effect of 'novel running wheels' on circadian clocks of the nocturnal field mouse Mus booduga was investigated during free-running and entrained conditions. In order to find out whether daily access to novel running ...
Timely Administration Of Melatonin Accelerates Reentrainment To Phase-Shifted Light-Dark Cycles In The Field Mouse Mus Booduga

Sharma, Vijay Kumar; Singaravel, Muniyandi; Subbaraj, Ramanujam; Chandrashekaran, Maroli K (Marcel Dekker Inc, 1999)

The effect of melatonin on the rate of reentrainment after a 6h phase delay and a 6h phase advance in the light-dark (LD) cycle was assayed in the nocturnal field mouse Mus booduga. After a phase delay of 6h in the LD ...

Now showing items 41-60 of 98

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