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Search Results: 1 - 10 of 224998 matches for " R. R. Nair "
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On strong uniform distribution IV
Nair R
Journal of Inequalities and Applications , 2005,
Abstract: Let be a strictly increasing sequence of natural numbers and let be a space of Lebesgue measurable functions defined on . Let denote the fractional part of the real number . We say that is an sequence if for each we set , then , almost everywhere with respect to Lebesgue measure. Let . In this paper, we show that if is an for , then there exists such that if denotes , . We also show that for any sequence and any nonconstant integrable function on the interval , , almost everywhere with respect to Lebesgue measure.
Alexander′s disease presenting as status epilepticus in a child
Nair R
Journal of Postgraduate Medicine , 2005,
Abstract:
Correlative Analysis of Data and Functions of Neuronal Synapse  [PDF]
T. R. Gopalakrishnan Nair, A. Baby Jerald
Journal of Behavioral and Brain Science (JBBS) , 2013, DOI: 10.4236/jbbs.2013.32027
Abstract:

Until recently, the synaptic transmission and excitatory amino acid transporters activation of neurons are very well discussed in the previous studies and are considered to be the two distinct features of Synapse. It is also found that a large number of interactions take place in the domain of ionic exchanges and protein interactions in synapses. It is evolutionary to have destined to release of Neurotransmitters to conduct an impulse to the other consecutive neurons, which forms the most important characteristic of synapse. From the popular perspective, it has been identified that detailed theoretical closer correlation of data produced through various studies about synapse can unravel many mysteries related to functions of synapse. Hence, this research paper tries to concentrate on a selected group of prominent characteristics and properties of synapse and also highlights some noteworthy discoveries, emphasizing the influential capabilities of them in the thought process and improving the knowledge of the field. It also highlights the expressive properties and forms of synapse brought out through the evidences available in sparse to dense data in a correlational way.

Preliminary Study on the Antibacterial Activity of Six Medicinal Plants against Two Naso-Pharyngeal Pathogens—Streptococccus pyogenes and Pseudomonas aeruginosa  [PDF]
R. Jithesh Krishnan, S. Resmy Nair
American Journal of Plant Sciences (AJPS) , 2016, DOI: 10.4236/ajps.2016.76086
Abstract: Objective: The objective is to study the antibacterial activity of six medicinal plants against two naso-pharyngeal pathogens and determination of total phenol contents in ethanol extracts of those plants. Methods: Different serial concentrations (0.05 g/mL, 0.1 g/mL, 0.2 g/mL, 0.4 g/mL) of ethanolic and acetone extracts of Piper nigrum L. (Piperaceae), Ocimum sanctum Linn., Plectranthus amboinicus L. (Lamiaceae), Ayapana triplinervis M.Vahl. (Asteraceae), Cinnamomum zeylanicum L. (Lauraceae), Allium schoenoprasum Linn. (Liliaceace) were evaluated for the antibacterial activity using disc diffusion method against gram positive Streptococcus pyogenes and gram negative Pseudomonas aeruginosa. The extracts were prepared from different parts of the plants. The total phenol content was estimated using folin-ciocaltau reagent in catechol equivalents. Results: Majority of the extracts had inhibitory effect against the tested bacteria at different concentrations. In ethanol extracts, Plectranthus amboinicus exhibited the maximum zone of inhibition (14 mm) at 0.05 g/mL concentration against Streptococcus pyogenes, and Ocimum sanctum showed highest zone of bacterial inhibition (19 mm) at 0.05 g concentration against Pseudomonas aeruginosa. In acetone extracts, Piper nigrum had the maximum zone of bacterial inhibition (17 mm) in 0.4 g/mL concentration against Streptococcus pyogenes and Cinnamomum zeylanicum and Allium schoenoprasum exhibited the highest zone of bacterial inhibition (0.4 g/mL) against Pseudomonas aeruginosa. The ethanol extract of Plectranthus amboinicus contained the highest amount of phenol (0.8 mg/mL) and Allium schoenoprasum contained the lowest amount (0.62 mg/mL). In acetone, Cinnamomum zeylanicum contained highest phenol content (0.78 mg/mL). Conclusion: All these investigations pave way to the molecular modeling of the lead phyto compounds present in the studied plants, and also in finding out their biochemical action in various metabolic pathways and reactions of infection.
Normalized Weighted Averages for Tracing Continuous Trends of Data and Easy Filtering of Discontinuous Samples
R. PURUSHOTHAMAN NAIR
International Journal of Engineering Science and Technology , 2011,
Abstract: In this paper a set of normalized weighted averages which may be called as bi-average, tri-average, quadric-average or in general kth poly average, k=2,3,4,… is introduced. The weights can be easily assigned using the integer k. The linear combination of the weights with the samples is biased to latest samples of a given discrete data set when the samples are considered chronologically or sequentially. Hence these averages can generate moving and realistic trends of data without being a moving average. Computations of these averages are not explicitly depending on the size of the data set and can be done in a progressive way. The advantage is that it is not necessary to store the data samples or its size for computing these averages. An inferring mechanism is derived based on which one can easily decide whether current sample is continuous or not with previous samples based on the computed average. Illustrative examples are presented to establish the effectiveness of this inferring mechanism in testing continuous trends and filtering of discontinuous samples of flight telemetry data of a typical launch vehicle and that of sample data sets of standard continuous signals. Mathematical properties ofthese averages are discussed.
Antimicrobial activity of Terminalia catappa, Manilkara zapota and Piper betel leaf extract
Nair R,Chanda Sumitra
Indian Journal of Pharmaceutical Sciences , 2008,
Abstract: Aqueous and methanol extract of the leaves of Terminalia catappa L., Manilkara zapota L. and Piper betel L. were evaluated for antibacterial activity against 10 Gram positive, 12 Gram negative bacteria and one fungal strain, Candida tropicalis. Piperacillin and gentamicin were used as standards for antibacterial assay, while fluconazole was used as standard for antifungal assay. The three plants showed different degree of activity against the microorganisms investigated. The methanolic extract was considerably more effective than aqueous extract in inhibiting the investigated microbial strains. The most active antimicrobial plant was Piper betel.
Hybrid BDI-POMDP Framework for Multiagent Teaming
R. Nair,M. Tambe
Computer Science , 2011, DOI: 10.1613/jair.1549
Abstract: Many current large-scale multiagent team implementations can be characterized as following the belief-desire-intention (BDI) paradigm, with explicit representation of team plans. Despite their promise, current BDI team approaches lack tools for quantitative performance analysis under uncertainty. Distributed partially observable Markov decision problems (POMDPs) are well suited for such analysis, but the complexity of finding optimal policies in such models is highly intractable. The key contribution of this article is a hybrid BDI-POMDP approach, where BDI team plans are exploited to improve POMDP tractability and POMDP analysis improves BDI team plan performance. Concretely, we focus on role allocation, a fundamental problem in BDI teams: which agents to allocate to the different roles in the team. The article provides three key contributions. First, we describe a role allocation technique that takes into account future uncertainties in the domain; prior work in multiagent role allocation has failed to address such uncertainties. To that end, we introduce RMTDP (Role-based Markov Team Decision Problem), a new distributed POMDP model for analysis of role allocations. Our technique gains in tractability by significantly curtailing RMTDP policy search; in particular, BDI team plans provide incomplete RMTDP policies, and the RMTDP policy search fills the gaps in such incomplete policies by searching for the best role allocation. Our second key contribution is a novel decomposition technique to further improve RMTDP policy search efficiency. Even though limited to searching role allocations, there are still combinatorially many role allocations, and evaluating each in RMTDP to identify the best is extremely difficult. Our decomposition technique exploits the structure in the BDI team plans to significantly prune the search space of role allocations. Our third key contribution is a significantly faster policy evaluation algorithm suited for our BDI-POMDP hybrid approach. Finally, we also present experimental results from two domains: mission rehearsal simulation and RoboCupRescue disaster rescue simulation.
Kinetics of the Oxidation of Benzhydrols with Permanganate under Phase Transfer Catalysis in Organic Solvents  [PDF]
Koottil Muhammad Basheer, Joy Joseph, Thengumthanam D. R. Nair
Modern Research in Catalysis (MRC) , 2013, DOI: 10.4236/mrc.2013.22005
Abstract:

Kinetic studies of the oxidation of benzhydrol and some of its para-substituted derivatives using phase transferred permanganate in organic solvents that are immiscible with water have been carried out. The products of oxidation were the corresponding benzophenones. Kinetically first order dependence on the concentrations of substrate as well as the oxidant has been observed. The reaction rate was found to decrease with an increase in the dielectric constant of the organic solvent employed. The electronic effects of the substituents were found to be interesting. Both electron withdrawing and electron releasing groups at the para position of benzhydrol increased rate of the oxidation. The effects of different phase transfer catalysts (PTC) were also compared. The activation parameters have been evaluated and a mechanism consistent with the kinetic results has been proposed.

Post Liver Transplantation Lympho Proliferative Disorder, Classical Hodgkins Lymphoma Type—A Case Report  [PDF]
Indu R. Nair, Annie Jojo, Sudhindran Surendran, Dinesh Balakrishnan
International Journal of Clinical Medicine (IJCM) , 2014, DOI: 10.4236/ijcm.2014.518146
Abstract: Post transplantation lymphoproliferative disorder is a lymphoid/plasmacytic proliferation that develops as a consequence of immunosuppression in a recipient of a solid organ/bone marrow/stem cell allograft. The incidence reported in literature in post liver transplant patients is 1% - 2%. This case was of a 16-year-old boy who underwent liver transplantation for fulminant hepatic failure and subsequently developed PTLD. Morphologically and immunohistochemically, it was Hodgkin’s lymphoma like PTLD, which was the least common type reported in literature.
Water Molecules in the Carbon C60 Confined Space  [PDF]
M. Baskar, N. Sathyan, T. R. Gopalakrishnan Nair
Journal of Biophysical Chemistry (JBPC) , 2018, DOI: 10.4236/jbpc.2018.92002
Abstract: Experimental scenario of the world being successful in planting water molecule at binary level in fullerene C70 is of utmost importance to pursue the theoretical properties of predictive triple water molecules and poly water molecules in Vander Waals confined space like fullerenes. Here, we present a paper in these lines of exploration of embedding triple water molecules in a Carbon confined space through the studies of behavior of three water molecules in Fullerene C60 by ab-initio methods. This heterogeneous system manifests cyclic hydrogen bonds which may be working with flipping actions. The unusual structural property of water trimers is reported. There exists a dipole moment of 0.9 ± 0.1 Debye which indicates the probable semiconductor properties.
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