• Atanu Kumar Pati

      Articles written in Journal of Biosciences

    • Nest architecture of a bagworm species: Rhythmic pattern in the arrangement of sticks

      Arvind Agrawal Atanu Kumar Pati

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      Nest architecture of a bagworm species,Clania crameri was examined. Fortytwo bags (nests) were collected from the host plant,Clerodendron indicum and number of sticks used in each bag was counted. Furthermore, length of each stick in each nest was measured (in mm) clockwise one after another serially beginning with the longest stick. The data obtained were subjected to frequency analysis and power spectrum analysis. Results clearly reveal that the larvae of bagworms do not glue together sticks of different size randomly but with a definite pattern.

    • Do thyroid and testis modulate the effects of pineal and melatonin on haemopoietic variables inClarias batrachus?

      Maya Shedpure Atanu Kumar Pati

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      Involvement of pineal and its major hormone, melatonin, in the process of erythropoiesis in a freshwater catfish,Clarias batrachus has been investigated. The study was conducted during four phases, namely preparatory phase, spawning phase, postspawning phase and late postspawning phase of its annual reproductive cycle. During each phase a fish received either melatonin injections or subjected to pinealectomy. In addition, each fish in all the groups, received either iopanoic acid or cyproterone acetate or vehicle in the morning or late afternoon. Results clearly indicate that melatonin stimulates the rate of erythropoiesis inClarias batrachus. It appears that the extent of stimulation depends upon the phase of the annual reproductive cycle. However, in general, the pineal-or melatonin-induced modulation of blood variables is gonad dependent and thyroid seems to play a time of the day dependent subtle role

    • Pattern of shift rota modulates oral temperature circadian rhythm and sleep-wakefulness profiles in shift workers

      Shobha Gupta Atanu Kumar Pati Francis Levi

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      Twenty four shift workers (8 from a steel industry and 16 from a Government hospital) participated in the study. The subjects were instructed to self-measure oral temperature, 4 6 times a day for about three weeks. Sleep quantity and quality for each subject were analysed with the help of an appropriate inventory. The data were analysed by cosinor and power spectrum methods. The frequency of circadian rhythm detection was in the order of 48% in senior nurses, 29% in steel plant workers and 14% in junior nurses. These were also complemented by the results of power spectrum analysis. Present results suggest that rhythms of subjective fatigue and subjective drowsiness are governed neither by oral temperature oscillator nor by the sleep/wake cycle oscillator. The results show that shift rotation pattern chiefly modulates the circadian time structure of shift workers. It is also suggested that the phenomenon of circadian rhythm desynchronization in oral temperature appears to be independent of per day total sleep length.

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