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Browsing Faculty publications (EIBU) by Issue Date

Now showing items 1-20 of 98

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 ...
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, ...
Chronobiotic effect of melatonin following phase shift of light/dark cycles in the field mouse Mus booduga

Singaravel, M; Sharma, V K; Subbaraj, R; Nair, Ν Gopukumar (Indian Academy Sciences, 1996-12)

The objective of this study was to assess whether melatonin accelerates the reentrainment of locomotor activity after 6 h of advance and delay phase shifts following exposure to LD 12:12 cycle (simulating jet-lag/shift ...
Relationship Between Freerunning Period And Minimum Tolerable Light Pulse Interval Of Skeleton Photoperiods In Field Mice Mus Booduga

Sharma, Vijay Kumar; Singaravel, M; Chandrashekaran, M K; Subbaraj, R (Marcel Dekker Inc, 1997)

The entrainment of the circadian rhythm of locomotor activity was studied in the field mouse Mus booduga in order to examine the relationship between the free-running period (r) and minimum tolerable light pulse interval of ...
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 ...
Daylight and Artificial Light Phase Response Curves for the Circadian Rhythm in Locomotor Activity of the Field Mouse Mus booduga

Sharma, V K; Chandrashekaran, M K; Nongkynrih, P (Swets & Zeitlinger, 1997-08)

The sensitivity of the circadian pacemaker of the field mouse Mus booduga to diffuse daylight pulses of 15 min duration and 1000 lux intensity was measured in a series of experiments and a phase response curve (PRC) ...
Relationship Between Period and Phase Angle Differences in Mus booduga Under Abrupt Versus Gradual Light-Dark Transitions

Sharma, Vijay Kumar; Chandrashekaran, Maroli K; Singaravel, Muniyandi (Springer-Verlag, 1998-04)
Period-Dependent Oscillatory Free-Run in the Locomotor Activity Rhythm of the Field Mouse Mus booduga Under Skeleton Photoperiodic Regimes

Sharma, Vijay Kumar; Singaravel, M; Chandrashekaran, M K (Swets & Zeitlinger (Taylor & Francis), 1998-04)

The entrainment behaviour of the circadian rhythm of locomotor activity in the field mouse Mus booduga was studied in order to evaluate the role of the animals' free-running period (tau) and the duration of skeleton ...
Age-Dependent Modulation of Circadian Parameters in the Field Mouse Mus booduga

Sharma, Vijay Kumar; Chandrashekaran, Maroli K (Wiley-Liss, 1998-04-01)

The locomotor activity of the field mouse Mus booduga was monitored under continuous darkness (DD) for extended periods of 275 to 388 days. Free-running period (tau) activity time (alpha) and rest time (rho) were computed ...
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 ...
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 ...
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 ...
Ultraviolet Light-Induced Phase Response Curve for the Locomotor Activity Rhythm of the Field Mouse Mus booduga

Sharma, Vijay Kumar; Singaravel, Muniyandi; Subbaraj, Ramanujam (Springer-Verlag, 1999-02)
Relationship Between Light Intensity and Phase Resetting in a Mammalian Circadian System

Sharma, Vijay Kumar; Chandrashekaran, M K; Singaravel, Muniyandi; Subbaraj, Ramanujam (Wiley-Liss, 1999-02-01)

The light-induced phase-resetting response of the locomotor activity rhythm in the field mouse Mus booduga was studied at two phases of the circadian cycle known to respond to light stimuli of 15 min duration and 1000 lux ...
In the field mouse Mus booduga melatonin phase response curves (PRCs) have a different time course and wave form relative to light PRC

Sharma, Vijay Kumar; Chandrashekaran, M K; Singaravel, M; Subbaraj, R (Munksgaard Int Publ Ltd, 1999-04)

The phase shifting effects of the pineal hormone melatonin on the circadian locomotor activity rhythm of the field mouse Mus booduga was examined at various phases of the circadian cycle using single melatonin injections ...
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 ...
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 ...
Persistence of Eclosion Rhythm in Drosophila melanogaster After 600 Generations in an Aperiodic Environment

Sheeba, V; Sharma, V K; Chandrashekaran, M K; Joshi, A (Springer Verlag, 1999-09)

The ubiquity of circadian rhythms suggests that they have an intrinsic adaptive value (Ouyang et al. 1998; Ronneberg and Foster 1997). Some experiments have shown that organisms have enhanced longevity, development time ...
Effect of Different Light Regimes on Pre-Adult Fitness in Drosophila melanogaster Populations Reared in Constant Light for over Six Hundred Generations

Sheeba, V; Sharma, Vijay Kumar; Chandrashekaran, M K; Joshi, A (Swets & Zeitlinger, 1999-10)

Egg to eclosion development time and survivorship were assayed on four laboratory populations of Drosophila melanogaster that had been reared for over 600 generations in continuous light (LL) and constant temperature. The ...
Circadian Rhythm in the Locomotor Activity of a Surface-Dwelling Millipede Syngalobolus sp.

Koilraj, A John; Marimuthu, G; Sharma, Vijay Kumar (Swets & Zeitlinger, 1999-12)

Locomotor activity of the surface-dwelling millipede Syngalobolus sp. was recorded under laboratory conditions. Infra-red diodes were used to detect the locomotor activity in an oval shaped chamber, which was connected ...

Now showing items 1-20 of 98

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