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Articles by M. Sujatha
Total Records ( 2 ) for M. Sujatha
  M. Sujatha , P. Dhasarathan and B. Karthick
  Problem statement: Antibiotic susceptibility is still the best way for bacterial pathogen escape mechanism against immunity. Approach: In the present investigation, bacterial pathogens like Staphylococcus aureus, Escherichia coli, Aeromonas hydrophila, Klebsiella and Pseudomonas aeruginosa were used to screen antibiotic susceptibility and immunomodulatory potential. Results: All the test pathogens were sensitive to all the test antibiotics 11±2 mm) except penicillin. The conditions for the preparation of antigens of intact natural composition and conformation from pathogens (whole cell and heat killed), were determined using Swiss albino mice (Balb/C) as experimental species. Immunomodulatory potential of test pathogens were screened using animal model. Test pathogen decreases the body weight comparing that of normal mice, some notable changes were also noted in activity, growth, water consumption, feed consumption. Antibody titre level in animal serum decreased upto 50% in whole cell pathogen and heat killed pathogen treated animals. Conclusion: The five pathogens administered animals, decrement in B-lymphocyte was much pronounced in Pseudomonas aeruginosa followed by Escherichia coli, Staphylococcus aureus, Klebsiella sp., Aeromonas hydrophila in the 5 week. Pathogen treated mice showed an IgG suppressive effect. It is found to be suppressive to T cell production, so induction in cell mediated immunity has confirmed pathogenic potential of test pathogens. All these test pathogenic strains were remarkably suppressing immune system of pathogen exposed animals.
  M. Sujatha and R.S. Bhuvaneeswaran
  IEEE 802.15.4 is a WPAN (Wireless Personal Area Network) standard which is designed for short range communication. Wireless sensor networks use this standard for its communication. Most of these networks are battery operated. So, power resource has to be properly utilized to balance network performance. This standard follows blind random backoff contention mechanism which turns off the transceiver when it does not have data to transmit. Such, a design creates Hidden Node Collision (HNC) in a network which degrades network performance it terms of throughput, packet delay and power consumption. In this study, a new technique has been proposed in grouping strategy to mitigate the Hidden Node Collision (HNC) problem. Additionally, it introduces beamforming technique to conserve energy in the network. Simulations illustrates that proposed research not only avoids HNC problem but also outperforms IEEE 802.15.4 standard and previous grouping strategies.
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