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Search Results: 1 - 10 of 331226 matches for " Ch. Murali Mohan and S. Hara Sreeramulu* "
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P. Suman , P.V. Smitha , K.Y. Ramkumar , A. Siva , Ch. Murali Mohan and S. Hara Sreeramulu*
International Journal of Pharmaceutical Sciences and Research , 2013,
Abstract: Objectives: Psoralea corylifolia L. (seeds) and Plumbago zeylanica L. (bark) were combined in the ratio of 8: 2 and named as “Swithranasini” and used for the treatment of skin diseases in ayurvedic medicine. Scientific studies validating the therapeutic properties for this indigenous medicine are lacking. This study focused on determining antimicrobial efficacy of methanol and butter milk extracts along with antioxidant efficacies of these plant parts independently and in combination. Materials and Methods: Antimicrobial activity was tested against seven pathogenic bacteria and six pathogenic fungi by measuring the zone of inhibition. In vitro antioxidant activities were assayed by 2, 2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging method and Ferric reducing antioxidant power (FRAP) method. Results: Individual extracts of the two plants showed better zone of inhibition (12- 40 mm) when applied alone but the activity was more when applied in combination (18-50 mm) against the tested pathogens. DPPH activity of methanol extracts showed higher radical scavenging activity when compared with the positive control, ascorbic acid. The IC50 values are 442.080, 457.825, 432.040 and 394.563 ug/ml for A, B, A+B and ascorbic acid respectively. The FRAP method also showed excellent antioxidant potential in combination (85.454 mg of Gallic acid equivalents/g) when compared with individual extracts A (78.571 mg GAE/g) and B (75.472 mg GAE/g).Conclusion: The results validate the potent use of “Swithranasini” against skin infections and results are an evidence for the existence of synergism among the compounds.
Analysis of BER Degradation for Transmitted Downlink DSCDMA Signals
Ashok Ch,Murali Mohan K V,David Solomon Raju Y
International Journal of Computer Technology and Applications , 2011,
Abstract: A predistorter-high power amplifier (PDHPA) pair has become a common practice in wireless communication to compensate for nonlinear distortion due to HPA. However, the PD-HPA pair still produces severe signal distortion when the input signal exceeds the PD-HPA’s saturation level. The effects of such distortion on bit error rate (BER) degradation in downlink direct sequencecode division multiple access signals (DSCDMA) are analyzed. We establish which signal characteristics at the HPA input and the factors contributing to BER. Assuming that the baseband CDMA signal is characterized as a complex Gaussian process, we develop analytic expressions for the BER and the contributing factors to BER
Fabrication of Curcumin Encapsulated Chitosan-PVA Silver Nanocomposite Films for Improved Antimicrobial Activity  [PDF]
K. Vimala, Murali Mohan Yallapu, K. Varaprasad, N. Narayana Reddy, S. Ravindra, N. Sudhakar Naidu, K. Mohana Raju
Journal of Biomaterials and Nanobiotechnology (JBNB) , 2011, DOI: 10.4236/jbnb.2011.21008
Abstract: The present study explores the in situ fabrication of chitosan-poly(vinyl alcohol)-silver nanocomposite films in view of their increasing applications as antimicrobial packaging, wound dressing and antibacterial materials. The reduction of silver ions into silver nanoparticles (AgNPs) is achieved in acidic solution of chitosan (C) and poly (vinyl alcohol) (PVA) using their functional groups (-OH, -COOH, -NH2 groups). The presence of silver nanoparticles in the chito-san-PVA film is confirmed by UV-Vis spectroscopy, Fourier Transform Infrared (FTIR) spectroscopy and X-ray Dif-fraction (XRD) analysis. The Scanning Electron Microscopic (SEM) images illustrate the presence of embedded silver nanoparticles throughout the films. In addition, the formed silver nanoparticles have an average particle size of ~ 16.5 nm as observed by Transmission Electron Microscopy (TEM). The anti-microbial and anti-fungal activity of the chitosan-PVA silver nanoparticle films have demonstrated significant effects against Escherichia coli (E. coli), Pseudomonas, Staphylococcus, Micrococcus, Candida albicans, and Pseudomonas aeruginosa (P. aeruginosa). To improve further their therapeutic efficacy as anti-microbial agents, curcumin encapsulated chitosan-PVA silver nanocomposite films are developed which showed enormous growth inhibition of E. coli compared to curcumin and chitosan-PVA silver nanoparticles film alone. Therefore, the present study clearly provides novel antimicrobial films which are potentially useful in preventing/treating infections.
Inheritance of morphological characters in sorghum
R Nagaraja Reddy,S Murali Mohan,R Madhusudhana,AV Umakanth
Journal of SAT Agricultural Research , 2008,
Abstract: Sorghum (Sorghum bicolor) is an important food andfodder crop in India and the world. It has a number ofadvantages which have made it the traditional staplecereal crop in subsistence or low-resource agriculture inthe hot semi-arid regions. Morphological variants withdistinct phenotypic expression can be used to establishlinkages and for indirect selection if found associatedwith useful traits. However, for constructing linkagemaps, a sufficiently large number of distinct morphologicaltraits is required. Several morphological variants fordifferent plant parts, such as leaf, stem, spike, grainpeduncle, etc have been reported in sorghum (IBPGRand ICRISAT 1993). Among the many traits, brown andpithy leaf midrib, presence of awn, type of glumes in thepanicles and plant color, ie, anthocyanin pigmentation ofleaf sheath have been found to be useful as markers sincethey are associated with one or the other economicallyimportant traits such as increased fodder quality (brownmidrib) (Porter et al. 1978) and resistance to bird damage(presence of awns) (Kullaiswamy and Goud 1983). Closedglume type panicles have advantage over open typepanicles in offering resistance to grain mold infection(Murty 2000) and tan-colored plants are most preferredin seed industry as they exhibit immunity to variousfungal diseases (Melake-Berhan et al. 1996). A recentreport on the effects of plant color on agronomiccharacters of sorghum showed lower grain yields from agroup of tan hybrids compared to pigmented hybrids(Williams-Alanis et al. 1995). Further, such traits are moreimportant from the point of identification of cultivar,which is much needed in the present era of plant varietyprotection (Roy et al. 2004). In view of the importance ofthese characters in sorghum, an attempt has been made tostudy the inheritance of these characters using a set ofcultivars.
Content Based Image Retrieval Using Exact Legendre Moments and Support Vector Machine
Ch. Srinivasa Rao,S. Srinivas Kumar,B. Chandra Mohan
Computer Science , 2010, DOI: 10.5121/ijma.2010.2206
Abstract: Content Based Image Retrieval (CBIR) systems based on shape using invariant image moments, viz., Moment Invariants (MI) and Zernike Moments (ZM) are available in the literature. MI and ZM are good at representing the shape features of an image. However, non-orthogonality of MI and poor reconstruction of ZM restrict their application in CBIR. Therefore, an efficient and orthogonal moment based CBIR system is needed. Legendre Moments (LM) are orthogonal, computationally faster, and can represent image shape features compactly. CBIR system using Exact Legendre Moments (ELM) for gray scale images is proposed in this work. Superiority of the proposed CBIR system is observed over other moment based methods, viz., MI and ZM in terms of retrieval efficiency and retrieval time. Further, the classification efficiency is improved by employing Support Vector Machine (SVM) classifier. Improved retrieval results are obtained over existing CBIR algorithm based on Stacked Euler Vector (SERVE) combined with Modified Moment Invariants (MMI).
PCA based image denoising
Y. Murali Mohan Babu
Signal & Image Processing , 2012,
Abstract: Principal component analysis (PCA) is an orthogonal transformation that seeks thedirections of maximum variance in the data and is commonly used to reduce the dimensionality of the data.In image denoising, a compromise has to be found between noise reduction and preserving significantimage details. PCA is a statistical technique for simplifying a dataset by reducing datasets to lowerdimensions. It is a standard technique commonly used for data reduction in statistical pattern recognitionand signal processing. This paper proposes a denoising technique by using a new statistical approach,principal component analysis with local pixel grouping (LPG). This procedure is iterated second time tofurther improve the denoising performance, and the noise level is adaptively adjusted in the second stage.
Comparative Performance of Ceramic Coated Diesel Engine with Mohr Oil in Crude and Biodiesel Form
T. Ratna Reddy,M.V.S. Murali Krishna,Ch. Kesava Reddy,Jaya Prakash Narayan
International Journal of Engineering and Advanced Technology , 2013,
Abstract: Investigations were carried out to evaluate the performance of a low grade low heat rejection (LHR) diesel engine with ceramic coated cylinder head with 3-mm air gap with different operating conditions [normal temperature and pre-heated temperature] of crude mohr oil (CMO) and mohr oil based biodiesel (MOBD) with varied injection pressure and injection timing. Performance parameters of brake thermal efficiency, exhaust gas temperature, volumetric efficiency and sound intensity were determined at various values of brake mean effective pressure (BMEP).Exhaust emissions of smoke and oxides of nitrogen (NOx) were recorded at the various values of BMEP. Combustion characteristics at peak load operation of the engine were measured with TDC (top dead centre) encoder, pressure transducer, console and special pressure-crank angle software package. Conventional engine (CE) showed compatible performance, while LHR engine showed marginally increased performance with vegetable oils (CMO & MOBD) operation at recommended injection timing and pressure. The performance of both version of the engine improved with advanced injection timing and at higher injection pressure when compared with CE with pure diesel operation.
Performance Evaluation of a Low-Grade Low-Heat-Rejection Diesel Engine with Crude Pongamia oil
Ch. Kesava Reddy,M. V. S. Murali Krishna,P. V. K. Murthy,T. Ratna Reddy
ISRN Renewable Energy , 2012, DOI: 10.5402/2012/489605
Performance Evaluation of a Low-Grade Low-Heat-Rejection Diesel Engine with Crude Pongamia oil
Ch. Kesava Reddy,M. V. S. Murali Krishna,P. V. K. Murthy,T. Ratna Reddy
ISRN Renewable Energy , 2012, DOI: 10.5402/2012/489605
Abstract: Investigations are carried out to evaluate the performance of a low heat rejection (LHR) diesel engine with ceramic coated cylinder head [ceramic coating of thickness 500?microns is done on inside portion of cylinder head] with different operating conditions [normal temperature and pre-heated temperature] of crude Pongamia oil (CPO) with varied injection pressure and injection timing. Performance parameters and pollution levels are determined at various magnitudes of brake mean effective pressure. Combustion characteristics at peak load operation of the engine are measured with special pressure-crank angle software package. Conventional engine (CE) showed deteriorated performance, while LHR engine showed improved performance with CPO operation at recommended injection timing and pressure and the performance of both version of the engine is improved with advanced injection timing and at higher injection pressure when compared with CE with pure diesel operation. The optimum injection timing is 31°bTDC for conventional engine while it is 29°bTDC with LHR engine with vegetable oil operation. Peak brake thermal efficiency increased by 5%, smoke levels decreased by 2% and NOx levels increased by 40% with CPO operation on LHR engine at its optimum injection timing, when compared with pure diesel operation on CE at manufacturer’s recommended injection timing. 1. Introduction The civilization of a particular country has come to be measured on the basis of the number of automotive vehicles being used by the public of the country. The tremendous rate at which population explosion is taking place imposes expansion of the cities to larger areas, and common man is forced these days to travel long distances even for their routine works. This in turn us causing an increase in vehicle population at an alarm rate thus bringing in pressure on government to spend huge foreign currency for importing crude petroleum to meet the fuel needs of the automotive vehicles. The large amount of pollutants emitting out from the exhaust of the automotive vehicles run on fossil fuels is also increasing as this is proportional to number of vehicles. In view of heavy consumption of diesel fuel involved in not only transport sector but also in agricultural sector and also fast depletion of fossil fuels, the search for alternate fuels has become pertinent apart from effective fuel utilization which has been the concern of the engine manufacturers, users, and researchers involved in combustion and alternate fuel research. The idea of using vegetable oil as fuel has been around from the birth
Prasanthi N. L.,Mohan Ch. Krishna,Manikiran S.S.,Rao N. Rama
International Journal of Research in Ayurveda and Pharmacy , 2010,
Abstract: A simple, precise and reproducible UV spectrophotometric method for simultaneous estimation of ambroxol hydrochloride and guiaphensin by simultaneous equation method has been developed and validated. In this method methanol was utilized as solvent. The method was based on the measurement of absorbance of ambroxol hydrochloride and guiaphensin at 242 and 272 nm respectively. This method obeyed Beer’s law in the concentration range of 5-50 mcg/mL for ambroxol and 10-80 mcg/mL for guiaphensin. The results of the analysis have been validated statistically and recovery studies confirmed the accuracy of the proposed method. This method was successfully applied to the determination of these drugs in pharmaceutical dosage forms.
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