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Search Results: 1 - 10 of 138912 matches for " K. Sreekumar "
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Temperature Adaptation Study on Probiotic Bacillus subtilis SK09 Based on its Extracellular Proteins
G. Sreekumar,K. Soundarajan
Advance Journal of Food Science and Technology , 2010,
Abstract: The assessment of the thermal adaptation characteristics of a probiotic organism is crucial since the probiotic bacteria are sensitive to thermal stress created by the gut environment. Probiotic Bacillus subtilis SK09 was subjected to varying temperatures growth conditions and checked for its thermal adaptation. Experiments were carried out with cultures grown in Nutrient broth at three different temperatures namely 25, 35 and 40oC. After 24 h the extracellular secretions present in the cell free supernatant were analyzed for amylase and $-galactosidase activity as well the net protein content. Bacillus subtilis SK09 showed a prominent growth and protein profile in 35oC with maximum enzyme activity and total protein production compared to other two conditions. At 40°C the strain exhibited a 30 kDa protein which might have been induced due to thermal stress.
X-ray spectral evolution of low-mass X-ray binary GX 349+2
V. K. Agrawal,P. Sreekumar
Physics , 2003, DOI: 10.1111/j.1365-2966.2003.07147.x
Abstract: We present the results of a systematic investigation of spectral evolution in the Z source GX 349+2, using data obtained during 1998 with Proportional-Counter-Array (PCA) on-board the RXTE satellite. The source traced a extended normal branch (NB) and flaring branch (FB) in the color-color diagram (CD) and hardness-intensity diagram (HID) during these observations. The spectra at different positions of Z-track were best fitted by a model consisting of a disk blackbody and a comptonized spectrum. A broad (gaussian) iron line at $\sim 6.7$ keV is also required to improve the fit. The spectral parameters showed a systematic and significant variation with the position along the Z-track. The evolution in spectral parameters is discussed in the view of increasing mass accretion rate scenario, proposed to explain the motion of Z sources in the CD and HID.
Analysis of music: controlled random music and probability distribution function of recurrence time of amplitude peaks
Vishnu Sreekumar,Mahendra K. Verma,Gaurav Narain,Venkatesh K. S
Physics , 2008,
Abstract: Correlations in music that exist within its waveform are studied. Monophonic wave files of random music are generated and the probability distribution function of time interval between large signal values is analyzed. A power law behavior for the distribution function in the range from 0.1 millisecond to 20 milliseconds is observed. An attempt is made to investigate the origin of these correlations by randomizing each of the factors (frequencies, intensities and durations of notes of the random music files) separately.
Montmorillonite K10 Clay Catalyzed One Pot Synthesis of 2,4,6-Tri Substituted Pyridine under Solvent Free Condition  [PDF]
Vellayan Kannan, Krishnapillai Sreekumar
Modern Research in Catalysis (MRC) , 2013, DOI: 10.4236/mrc.2013.22007
Abstract:

Montmorillonite K10 catalyzed synthesis of 2,4,6 triaryl pyridine under solvent free condition is described. Montmorillonite effectively catalyzed the reaction in good to excellent yields. Using this solid catalyst, the reactions could be carried out in a short period of time with very good yield of triaryl pyridines, up to 97% under solvent free condition. This catalyst could be recycled very easily, which makes this methodology environmentally benign. The catalyst is active over three cycles.

Fluticasone propionate (0.05%) cream compared to betamethasone valerate (0.12%) cream in the treatment of steroid-responsive dermatoses: a multicentric study
Jamkhedkar Preeta,Shenai Chitra,Shroff H,Sreekumar K
Indian Journal of Dermatology, Venereology and Leprology , 1996,
Abstract: Fluticasone propionate is a new topical steroid developed as a result of modification of the 19-carbon androstane structure. In the present study, efficacy of this steroid was compared with betamethasone valerate cream in patients with psoriasis and eczema. Though fluticasone propionate was marginally more effective than betamethasone valerate, this difference was not statistically significant.
Self-assessment of facial form oral function and psychosocial function before and after orthognathic surgery: A retrospective study
Narayanan Vinod,Guhan Shankar,Sreekumar K,Ramadorai Ashok
Indian Journal of Dental Research , 2008,
Abstract: Orthognathic surgery is a well-accepted treatment for patients with skeletal discrepancies. The primary motivation of many patients who seek orthognathic surgery is esthetics and not for correction of functional disability. The treatment is incomplete if the surgeon attempts to correct the physical deformity alone without adequate understanding and regard for the emotional framework. The purpose of this study is aimed at patient′s self-perceptions of facial form oral function and psychosocial function before and after orthognathic surgery. Fifty patients were included in the study, of which 21 were used as control. Twenty-two questions were asked to evaluate the problem in all four areas as mentioned earlier. Each question takes a score from one to five. In group I, the internal consistency of each scale indicates moderate to high internal reliability, ranging from α = 0.71 for general health to α = 0.88 for psychosocial problem. In group II, except for functional problems, the internal consistency of each scale has moderate to high reliability. The psychological wellbeing of an orthognathic surgery patient is enhanced by careful preoperative counseling regarding the expected surgical treatment objectives, the operative course, and the expected postoperative sequelae. Patients who undergo orthognathic surgery readily accept the changes in their postoperative appearance and are satisfied with achieved results.
Diffusion-weighted magnetic resonance imaging in acute reversible toxic leukoencephalopathy: A report of two cases
Sivasubramanian S,Moorthy Srikant,Sreekumar K,Kannan R
Indian Journal of Radiology and Imaging , 2010,
Abstract: Acute toxic leukoencephalopathy may be caused by endogenous or exogenous toxins. It may reverse clinically if the offending agent is withdrawn or the underlying condition is treated. However, demonstration of reversibility on imaging, especially with diffusion-weighted MRI, has been reported only very recently. We report two such cases.
Factors Influencing Purchase of ‘NANO’ the Innovative Car from India-An Empirical Study
Sreekumar,R.D. Bikash; S.K. Pravat
Asian Journal of Business Management , 2010,
Abstract: This study attempts to find the factors, which are important for choosing the revolutionary car ‘Nano’ launched by one of the leading Indian automobile industry called ‘Tata Motors’. The year 2009 has been significant for Indian automobile industry as numbers of new models were launched for the domestic market and also registered a significant growth in exports. The report published by Cygnus research ranked Indian automobile sector to be number one on the basis of sales growth and Profit After Tax (PAT) growth during October- December 09 over October- December 08 over other 14 manufacturing sectors. The paper considers 22 factors, which may be important in the customer decision-making process. Two approaches viz. Grey Relational Analysis and RIDIT analysis is used to rank the factors.
Heavy Metal Contamination in Soil, Water and Fodder and their Presence in Livestock and Products : A Review
V. Rajaganapathy,F. Xavier,D. Sreekumar,P.K. Mandal
Journal of Environmental Science and Technology , 2011,
Abstract: Environmental pollution is a global problem for man and animals. Pollutants from industrial waste enter into the livestock production systems and then into food chain. In most developing countries it is often attributed to industrialization with improper waste disposal. In developed countries impact of pollution on domestic and wild animals due to chemical toxicities are reported. Pollution is a serious problem in India, threatening the animal and human health. Heavy metal pollution is becoming a serious health concern in recent years. High levels of heavy metals in soil, water and animals have been reported in different parts of India due to pollution. Heavy metals from industrial waste contaminate drinking water, soil, fodder and food. The toxic heavy metals like Cd, Pb and Hg affect biological functions, affecting hormone system and growth. Many heavy metals accumulate in one or more of the body organs in food animals and are transmitted through food causing serious public health hazard. These toxicants ar
Distributed Rate Adaptation and Power Control in Fading Multiple Access Channels
Sreejith Sreekumar,Bikash K. Dey,Sibi Raj B. Pillai
Mathematics , 2014,
Abstract: Traditionally, the capacity region of a coherent fading multiple access channel (MAC) is analyzed in two popular contexts. In the first, a centralized system with full channel state information at the transmitters (CSIT) is assumed, and the communication parameters like transmit power and data-rate are jointly chosen for every fading vector realization. On the other hand, in fast-fading links with distributed CSIT, the lack of full CSI is compensated by performing ergodic averaging over sufficiently many channel realizations. Notice that the distributed CSI may necessitate decentralized power-control for optimal data-transfer. Apart from these two models, the case of slow-fading links and distributed CSIT, though relevant to many systems, has received much less attention. In this paper, a block-fading AWGN MAC with full CSI at the receiver and distributed CSI at the transmitters is considered. The links undergo independent fading, but otherwise have arbitrary fading distributions. The channel statistics and respective long-term average transmit powers are known to all parties. We first consider the case where each encoder has knowledge only of its own link quality, and not of others. For this model, we compute the adaptive capacity region, i.e. the collection of average rate-tuples under block-wise coding/decoding such that the rate-tuple for every fading realization is inside the instantaneous MAC capacity region. The key step in our solution is an optimal rate allocation function for any given set of distributed power control laws at the transmitters. This also allows us to characterize the optimal power control for a wide class of fading models. Further extensions are also proposed to account for more general CSI availability at the transmitters.
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