33 results on '"G, Dileep"'
Search Results
2. Mixing data for multivariate statistical study of groundwater quality
- Author
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Kumar, P. G. Dileep, Viswanath, Narayanan C., Cyrus, Sobha, and Abraham, Benny Mathews
- Published
- 2020
- Full Text
- View/download PDF
3. Compression of biomedical images using DDWT and noise shaping algorithm
- Author
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Chitra Ramaprakash, Sheetalrani R. Kawale, Shweta Barshe, C. M. Velu, G. Dileep Kumar, and Madasamy G. Raja
- Subjects
General Nursing ,Education - Abstract
The Discrete Wavelet Transform (DWT) is a unique signal analysis approach that has been actively applied to a range of difficulties in image processing in recent years. Windowing with varying area sizes is what makes it so powerful. DWT allows us to use small areas where we want high-frequency information more effectively. Wavelet research has picked up steam in the last few years. When it comes to digital signal processing and communication, DWT can be used in a variety of ways. As a voice and picture coding technology, it has many of the characteristics of primitive models of the human visual system. When this is taken into account, it is possible that coding methods will produce compression that is more pleasing to the eye than those that aim to minimise square error. Patterns and breakdown points can be revealed in data using DWT, which other approaches miss. DWT is becoming increasingly popular and is the subject of extensive research, in part because of its many advantages.
- Published
- 2022
4. Design, synthesis, cytotoxic, and anti-inflammatory activities of some novel analogues of aloe-emodin isolated from the rhizomes of Rheum emodi
- Author
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Kumar, G. Dileep, Siva, Bandi, Ashwini, K., Kumar, J. Vinod, Ramalingam, V., Balaji, A. Sai, and Babu, K. Suresh
- Abstract
In connection with our continuous efforts in the synthesis of derivatives from major compounds isolated from traditional medicinal plants, in the present study we have attempted to synthesize the furan-conjugated aloe-emodin derivatives (5a–j) using a three-component reaction. The synthesized derivatives were assessed for anticancer activity against five different cancer cell lines using the in vitro MTT assay and the results showed that most of the derivatives are potent against cancer cells comparing with the control. Compounds 5a and 5e showed excellent activity against all the cancer cells with less than 12.5 µM and arrested the cell cycle at the G0/G1 phase in both CAL27 and SCC9 cells. Compound 5e induces the early apoptosis in CAL27 cells and compounds 5a and 5e induce early and late apoptosis, respectively, in SCC9 cells. Moreover, compounds 5b, 5c, 5i, and 5j showed excellent anti-inflammatory activity in LPS-stimulated RAW 264.7 cells by inhibiting IL-6 production. The molecular docking studies revealed that compound 5e has strong interaction with the CLK kinase and protein kinase II through hydrogen binding Asp325 and Lys290.
- Published
- 2022
- Full Text
- View/download PDF
5. Visible light photodegradation of 2,4-dichlorophenol using nanostructured NaBiS
- Author
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V G Dileep, Kumar, K R, Balaji, R, Viswanatha, G, Ambika, R, Roopa, B M, Basavaraja, Madhu, Chennabasappa, C R Ravi, Kumar, Zhong, Chen, Xuan-Thanh, Bui, and M S, Santosh
- Subjects
Kinetics ,Photolysis ,Anti-Infective Agents ,Light ,Catalysis ,Ecosystem ,Chlorophenols - Abstract
Removal of the hazardous and endocrine-disrupting 2,4-dichlorophenol (2,4-DCP) from water bodies is crucial to maintain the sanctity of the ecosystem. As a low bandgap material (1.37 eV), NaBiS
- Published
- 2021
6. Analytical Methods in Standardization of Bhasmas: A Review
- Author
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P G, Dileep Kumar, primary, P., Nataraja Yadav, primary, S., Gananadhamu, primary, and K.S., Nataraj, primary
- Published
- 2021
- Full Text
- View/download PDF
7. Environmental survival of SARS-CoV-2 – A solid waste perspective
- Author
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Iyer, Mahalaxmi, primary, Tiwari, Sushmita, additional, Renu, Kaviyarasi, additional, Pasha, Md Younus, additional, Pandit, Shraddha, additional, Singh, Bhupender, additional, Raj, Neethu, additional, Krothapalli, Saikrishna, additional, Kwak, Hee Jeong, additional, Balasubramanian, Venkatesh, additional, Jang, Soo Bin, additional, G., Dileep Kumar, additional, Uttpal, Anand, additional, Narayanasamy, Arul, additional, Kinoshita, Masako, additional, Subramaniam, Mohana Devi, additional, Nachimuthu, Senthil Kumar, additional, Roy, Ayan, additional, Valsala Gopalakrishnan, Abilash, additional, Ramakrishnan, Parthasarathi, additional, Cho, Ssang-Goo, additional, and Vellingiri, Balachandar, additional
- Published
- 2021
- Full Text
- View/download PDF
8. Analytical Methods in Standardization of Bhasmas: A Review
- Author
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P G, Dileep Kumar, P., Nataraja Yadav, S., Gananadhamu, K.S., Nataraj, P G, Dileep Kumar, P., Nataraja Yadav, S., Gananadhamu, and K.S., Nataraj
- Abstract
Ayurveda the ancient science well known for its potential therapeutic effects with unique metallic, herbal juices/fruits in the treatment of chronic ailments. A well- known ayurvedic potent preparation, Bhasma is also known as ash which is a metallic base prepared by sophisticated pharmaceutical processes also plays a major role in acute, sub-acute, and chronic diseases. In order to determine its quality and purity to make sure the acceptability, the safety of the formulation standardization is very necessary. In this short review, an attempt has been made to present ancient methods to standardize physical characterstics like Verna, Nisvadutam, Nishchandratvam, Varitara, Unama, Rekhapurmatvam, Slakshmatvam..etc.,and chemical characterstics of bhasmas like Apurnabhavta, Niruttha, Amla Pariksha with advanced methods like SEM, TEM, and NPST, along with other natural and ancient analytical techniques. Keywords: Bhasmas, Standardization, Analytical methods, SEM, TEM.
- Published
- 2021
9. Environmental survival of SARS-CoV-2 – A solid waste perspective
- Author
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Abilash Valsala Gopalakrishnan, Saikrishna Krothapalli, Parthasarathi Ramakrishnan, Mahalaxmi Iyer, Venkatesh Balasubramanian, Hee Jeong Kwak, Arul Narayanasamy, Anand Uttpal, Sushmita Tiwari, Masako Kinoshita, Younus Pasha, Bhupender Singh, Neethu Raj, G. Dileep Kumar, Ssang-Goo Cho, Kaviyarasi Renu, Shraddha Pandit, Ayan Roy, Balachandar Vellingiri, Senthil Kumar Nachimuthu, Soo Bin Jang, and Mohana Devi Subramaniam
- Subjects
Artificial intelligence ,Municipal solid waste ,Adaptive Neurofuzzy Inference System, ANFIS ,010501 environmental sciences ,Solid Waste ,01 natural sciences ,Biochemistry ,0302 clinical medicine ,General Packet Radio Service, GPRS ,Pandemic ,Central Pollution Control Board, CPCB ,Severe acute respiratory syndrome coronavirus 2, SARS-CoV-2 ,Environmental impact assessment ,030212 general & internal medicine ,Genetic Algorithm, GA ,General Environmental Science ,Remote Sensing, RS ,Transmission (medicine) ,Risk of infection ,Antibiotic-resistance genes, ARGs ,Biomedical waste ,Environmental damage ,Waste mismanagement, WM ,Biomedical Waste, BMW ,Artificial Neural Network, ANN ,Global Positioning System, GPS ,Secondary infection ,Personnel protective equipment (PPE) ,Coronavirus disease 2019, COVID-19 ,Ultraviolet, UV ,Personal protective equipment, PPE ,Geographic Information Systems, GIS ,Article ,Radio frequency identification, RFID ,03 medical and health sciences ,Environmental health ,Humans ,Pandemics ,Personal Protective Equipment ,Personal protective equipment ,0105 earth and related environmental sciences ,SARS-CoV-2 ,Antibiotic-resistant bacteria, ARB ,Biomedical waste management ,Internet of Things, IoT ,COVID-19 ,World Health Organization, WHO ,Business ,Support Vector Machine, SVM ,Very high frequency radio, VHFR - Abstract
The advent of COVID-19 has kept the whole world on their toes. Countries are maximizing their efforts to combat the virus and to minimize the infection. Since infectious microorganisms may be transmitted by variety of routes, respiratory and facial protection is required for those that are usually transmitted via droplets/aerosols. Therefore this pandemic has caused a sudden increase in the demand for personal protective equipment (PPE) such as gloves, masks, and many other important items since, the evidence of individual-to-individual transmission (through respiratory droplets/coughing) and secondary infection of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). But the disposal of these personal protective measures remains a huge question mark towards the environmental impact. Huge waste generation demands proper segregation according to waste types, collection, and recycling to minimize the risk of infection spread through aerosols and attempts to implement measures to monitor infections. Hence, this review focuses on the impact of environment due to improper disposal of these personal protective measures and to investigate the safe disposal methods for these protective measures by using the safe, secure and innovative biological methods such as the use of Artificial Intelligence (AI) and Ultraviolet (UV) lights for killing such deadly viruses.
- Published
- 2021
10. Facile green synthesis of Molybdenum oxide nanoparticles using Centella Asiatica plant: Its photocatalytic and electrochemical lead sensor applications.
- Author
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Mamatha, K. M., murthy, V. Srinivasa, Ravikumar, C. R., Murthy, H. C. Ananda, Kumar, V. G. Dileep, Kumar, A. Naveen, and Jahagirdar, A. A.
- Subjects
MOLYBDENUM oxides ,NANOPARTICLES ,CENTELLA asiatica ,PHOTOCATALYSIS ,FOURIER transform infrared spectroscopy ,ENERGY bands - Abstract
The molybdenum oxide nanoparticles (MoO
3 NPs) have been successfully synthesized via green combustion method using Centella asiatica plant powder. The powder x-ray diffraction (PXRD), Fourier transform infrared spectroscopic (FTIR), scanning electron microscopic (SEM) and diffuse reflectance spectroscopic (DRS) techniques were used to characterize the MoO3 nanoparticles. The PXRD patterns of the sample revealed pure hexagonal phase. The Scherrer's method was employed to find the crystallite size of the synthesized material and the result obtained was confirmed by the TEM analysis. The optical energy band gap value (Eg ) of the sample was calculated using the Tauc relation, and it was found to be around 3.41 eV. The photocatalytic degradation of MoO3 NPs on Direct Green (DG) and Navy Blue (NB) dye was evaluated under UV light irradiation. The electrochemical study of prepared electrode with graphite powder in 0.1 M KOH electrolyte solution displayed superior redox potential output as intended by cyclic voltammetric and amperometric studies, where the material was employed for its sensing abilities such as a highly toxic metal like lead. [ABSTRACT FROM AUTHOR]- Published
- 2022
- Full Text
- View/download PDF
11. Mixing data for multivariate statistical study of groundwater quality
- Author
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Narayanan C. Viswanath, Benny Mathews Abraham, P. G. Dileep Kumar, and Sobha Cyrus
- Subjects
Mixed model ,010504 meteorology & atmospheric sciences ,media_common.quotation_subject ,India ,010501 environmental sciences ,Management, Monitoring, Policy and Law ,01 natural sciences ,Fuzzy Logic ,Water Quality ,Statistics ,Linear regression ,Groundwater ,0105 earth and related environmental sciences ,General Environmental Science ,media_common ,Mathematics ,Adaptive neuro fuzzy inference system ,Variables ,Statistical model ,Regression analysis ,General Medicine ,Pollution ,Data set ,Sample size determination ,Linear Models ,Environmental Monitoring - Abstract
In the present paper, a multivariate statistical modeling study of water quality data from different places of Kozhikode Gity, Kerala, India, has been conducted applying multiple linear regression (MLR), structural equation modeling (SEM), and adaptive neuro-fuzzy inference system (ANFIS) modeling. First, we combined water quality data from different places in the study area over different time periods to obtain a unified multiple linear regression (MLR) model. By mixing three data sets from different places and time periods in four different ways, different regression models were formed with total dissolved solids (TDS) as the dependent variable and calcium, magnesium, nitrate, sodium, chloride, potassium, total hardness, and sulfate as independent variables. The effectiveness of each model was then tested against a data set, which corresponded to a different period and location. One unmixed model and three mixed models showed similar performance. An SEM was developed for the data set, which is obtained by mixing all the three data sets. The same regression coefficients are found for the SEM and the corresponding MLR. An improvement in the sample size as a result of mixing of data sets could be thought of as the reason for this phenomenon. We thus selected the MLR obtained by mixing all three data sets as our unified model. For the mixed data set, we then developed an ANFIS model with calcium, magnesium, nitrate, sodium, chloride, potassium, total hardness, and sulfate as input variables and TDS as the output variable. On the external data set, the ANFIS model showed a better performance than the MLR model.
- Published
- 2019
12. Analytical Methods in Standardization of Bhasmas: A Review.
- Author
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Kumar, P. G. Dileep, Yadav, P. Nataraja, Gananadhamu, S., and Nataraj, K. S.
- Subjects
STANDARDIZATION ,TREATMENT effectiveness ,CHRONIC diseases ,AYURVEDIC medicine - Abstract
Ayurveda the ancient science well known for its potential therapeutic effects with unique metallic, herbal juices/fruits in the treatment of chronic ailments. A well- known ayurvedic potent preparation, Bhasma is also known as ash which is a metallic base prepared by sophisticated pharmaceutical processes also plays a major role in acute, sub-acute, and chronic diseases. In order to determine its quality and purity to make sure the acceptability, the safety of the formulation standardization is very necessary. In this short review, an attempt has been made to present ancient methods to standardize physical characterstics like Verna, Nisvadutam, Nishchandratvam, Varitara, Unama, Rekhapurmatvam, Slakshmatvam..etc.,and chemical characterstics of bhasmas like Apurnabhavta, Niruttha, Amla Pariksha with advanced methods like SEM, TEM, and NPST, along with other natural and ancient analytical techniques. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
13. Green synthesis and characterization of silver (Ag) nanoparticles using neem leaf extract and its antifungal activity against seed borne pathogens in chilli
- Author
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N. Natarajan, G. Dileep Kumar, and M. Divya
- Subjects
0106 biological sciences ,Antifungal ,030504 nursing ,Scanning electron microscope ,medicine.drug_class ,Nanoparticle ,01 natural sciences ,Silver nanoparticle ,Reaction rate ,03 medical and health sciences ,Silver nitrate ,chemistry.chemical_compound ,chemistry ,Transmission electron microscopy ,Botany ,medicine ,0305 other medical science ,Antibacterial activity ,010606 plant biology & botany ,Nuclear chemistry - Abstract
The silver nanoparticles (AgNPs) synthesized using hot water neen leaf extract (NLF) as reducing and stabilizing agent are reported and evaluated for antibacterial activity against chilli seed borne pathogens. The effect of extract concentration, contact time, pH and temperature on the reaction rate and the shape of the Ag nanoparticles were investigated. The data revealed that the rate of formation of the nanosilver size decreased significantly in the basic medium with different concentration (1 mM, 5 mM and 10 mM). Synthesized was characterized by UV-vis spectroscopy, X-ray diffraction, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The nanoparticle synthesis using different concentration of silver nitrate and 5 mM was getting nano sized silver particles AgNPs. The silver nanoparticles were with an average size of 55 to 350 nm and mostly rod shape. The antifungal activity of synthesized AgNPs was observed in seed health test and different concentration of silver NPs (750 mg, 1000 mg and 1250 mg) were used for seed health test. The AgNPs at 750 mg concentration significantly inhibited the seed borne pothogens. Thus AgNPs showed broad spectrum antifungal activity at lower concentration and may be a good alternative therapeutic approach in future.
- Published
- 2016
14. Physiological efficiency of succulents under different growing environments in tropical condition
- Author
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G. Dileep Kumar, M. Dhivya, and R. Sankaranarayanan
- Subjects
chemistry.chemical_classification ,chemistry.chemical_compound ,chemistry ,Chlorophyll ,Carbon dioxide ,Botany ,Malic acid ,Biology ,Photosynthetic efficiency ,Phosphoenolpyruvate carboxykinase ,Phosphoenolpyruvate carboxylase ,Photosynthesis ,Carotenoid - Abstract
Investigations were undertaken to study the physiological effectiveness of different ornamental succulents under tropical condition. Six species of succulents were evaluated under four different growing environments. Results showed that the performance of succulents grown under conservatory house condition was found to be performed well and ideal with respect to chlorophyll, carotenoids, relative water content and photosynthetic rate than other growing environments. The succulent species viz ., Haworthia limifolia, Monadenium lugardiae and Aloe juvenna were the most suitable species for growing under conservatory house condition due to its high nocturnal CO 2 uptake and cell sap acidification which possess CAM metabolism. CAM involves nocturnal CO 2 uptake and fixation by cytosolic phosphoenolpyruvate carboxylase into malic acid that is stored in the vacuole causing nocturnal cell sap acidification. During the subsequent light period, malic acid is released from the vacuole in the form of malate that is then decarboxylated leading to deacidification of cell sap, formation of pyruvate or phosphoenolpyruvate and liberation of CO 2 . Repeated acidification and deacidification cycles represent a characteristic physiological feature of CAM metabolism in succulents which is best suited for xeric environment and possess high photosynthetic efficiency.
- Published
- 2016
15. Antifungal activity of nanofungicide Trifloxystrobin 25% + Tebuconazole 50% against Macrophomina phaseolina
- Author
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G. Dileep Kumar, S. Nakkeeran, and N. Natarajan
- Subjects
Antifungal ,biology ,Hypha ,medicine.drug_class ,02 engineering and technology ,Plant Science ,Particle Size Analyzer ,010501 environmental sciences ,021001 nanoscience & nanotechnology ,biology.organism_classification ,01 natural sciences ,Microbiology ,Fungicide ,Horticulture ,Broad spectrum ,chemistry.chemical_compound ,Infectious Diseases ,Soil borne ,chemistry ,Macrophomina phaseolina ,medicine ,0210 nano-technology ,0105 earth and related environmental sciences ,Tebuconazole - Abstract
This study was aimed to develop the nanoform of a commercial fungicide Trifloxystrobin 25% + Tebuconazole 50% (75 WG) with broad spectrum of action for improving its antifungal activity against Macrophomina phaseolina. The fungicide commercially available as Trifloxystrobin 25% + Tebuconazole 50% (75 WG) was converted into its nanoform using ball milling method and assessed for its efficacy against the soil borne fungal pathogen M. phaseolina at various concentrations, namely 5, 10, 15, and 25 ppm using poisoned food technique. Nanoform of the fungicide was characterized using Scanning Electron Microscopy (SEM) and Particle Size Analyzer (PSA). The average particle size of nano Trifloxystrobin 25% + Tebuconazole 50% (75 WG) was about 108 nm. Fungicidal potential of nanoform was better in comparison to the conventional ones. Nanoform of the fungicide was effective at 10 ppm and it exerted hyphal abnormality, hyphal lysis and abnormality of sclerotial formation on M. phaseolina when tested under in vitro than control. This study suggests the possibility to enhance the antifungal activity of fungicide Trifloxystrobin 25% + Tebuconazole 50% (75 WG) towards the control of M. phaseolina. Key words: Antifungal, nanoformulations, chilli, Trifloxystrobin 25% + Tebuconazole 50% (75 WG), Macrophomina phaseolina.
- Published
- 2016
16. Ground Water Quality and Multivariate Statistical Methods
- Author
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E. R. Usha Kumari, K. K. Ammad, P. G. Dileep Kumar, and Narayanan C. Viswanath
- Subjects
Environmental Engineering ,Chemistry ,Health, Toxicology and Mutagenesis ,Statistical model ,Regression analysis ,Management, Monitoring, Policy and Law ,Total dissolved solids ,Pollution ,Chloride ,chemistry.chemical_compound ,Nitrate ,Linear regression ,Statistics ,Principal component analysis ,medicine ,Sulfate ,Water Science and Technology ,medicine.drug - Abstract
In this paper, an attempt was made to study the physico-chemical properties of ground water of the Kozhikode district, Kerala, India, by applying multivariate statistical methods on samples collected from various parts of the study area. Combining principal component analysis and multiple linear regression (MLR), we developed a regression model for predicting total dissolved solids (TDS) in terms of calcium, magnesium, nitrate, sodium, chloride, potassium, bicarbonate and sulfate. This study revealed that statistically, calcium is the most significant component of TDS in the study area. The relevance of the regression model with respect to experimental data was further evaluated by applying structural equation modeling (SEM).
- Published
- 2015
17. Statistical Analysis of Quality of Water in Various Water Shed for Kozhikode City, Kerala, India
- Author
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P. G. Dileep Kumar, K. K. Ammad, and Narayanan C. Viswanath
- Subjects
Hydrology ,Origin of water on Earth ,media_common.quotation_subject ,Environmental engineering ,Regression analysis ,General Medicine ,Total dissolved solids ,Geography ,Linear regression ,Principal component analysis ,Quality (business) ,Groundwater ,Ground water quality ,media_common - Abstract
Ground water is the principal source for drinking water and other activities in Kozhikode town. Monitoring the ground water quality therefore is of utmost importance. In this paper a multivariate statistical analysis of quality of ground water has been carried out, based on thirty data points of water shed in Kozhikode city, Kerala, India. The parameters examined were PH, Electric conductivity, Total Dissolved Solids, Total Hardness, Chlorides, Calcium and Magnesium, Sodium, Potassium, Bicarbonates and Sulphates. A methodology for characterizing ground water quality of watersheds based on the above data that mingle multiple linear regression, principal component analysis and structural equation modeling is presented. The aim of this work is to analyze hydro chemical data in order to explore the groundwater samples and the origin of water mineralization, using mathematical method and modeling. Thus, with the help of MATLAB, a regression equation is explored for the sampled ground water. The structural equation modeling which has been carried out using IBM-SPSS Amos, allows a simultaneous analysis of the entire system of parameters.
- Published
- 2015
- Full Text
- View/download PDF
18. Development and Evaluation of Gastroretentive Atenolol Tablets
- Author
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G. Dileep Kumar Reddy, Anroop B. Nair, Vikas Bansal, Azza A. Hasan, and Rachna Kumria
- Subjects
Absorption (pharmacology) ,chemistry.chemical_compound ,Chromatography ,chemistry ,Methyl cellulose ,medicine ,Lactose ,Citric acid ,Atenolol ,Friability ,Dosage form ,medicine.drug ,Bioavailability - Abstract
The low oral bioavailability of atenolol is primarily because of its poor absorption from the lower gastrointestinal tract. Gastroretentive dosage forms provide an opportunity to deliver the drug with absorption window in the proximal part of the GIT thereby increasing their bioavailability. The objective of this study was to develop a dosage form for atenolol with the objective of increasing the gastric residence and there by its oral bioavailability. Different formulations of floating tablets of atenolol (AT1-AT10) were prepared by varying the composition of hydroxypropyl methyl cellulose (HPMC) K100, lactose and citric acid. The tablets were evaluated for various parameters like friability, weight variation, content variation, floating lag time, total buoyancy and in vitro dissolution. The physicochemical properties of the prepared formulations were found to possess adequate physical integrity. Formulation AT8 showed the lowest floating lag time with 14 h buoyancy. Drug release was found to be dependent on the concentration of HPMC K100 and lactose in the formulation. Further, the increase in amount of citric acid leads to increase in atenolol release rate while reduces the floating time. The findings revealed that the formulation AT8 retarded the atenolol release (~73% in 12 h) and followed zero order kinetics. The in vitro data observed here substantiate the potential of the prepared formulation to provide adequate drug release and buoyancy to improve the bioavailability of atenolol, which necessitate further in vivo studies.
- Published
- 2014
19. Analysis and Improving FRT Capability of Grid Connected Doubly Fed Induction Generator based Wind Turbines
- Author
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G, Dileep Kumar, Bhimasingu, Ravikumar, G, Dileep Kumar, and Bhimasingu, Ravikumar
- Abstract
This thesis deals with the analysis, modeling, and control of the doubly-fed induction generator (DFIG) based wind turbines (WTs) and fault ride through capability improvement (FRT). The aim of FRT improvement is based on grid codes during faults WTs rather than disconnecting from grid, it has ability to support grid by injecting reactive current. Different FRT improvement methods are studied with objective of injecting demagnetizing and transient currents during fault. During the fault DFIG rotor back electromotive force (EMF), is high causing high rotor currents. It is found that transient reconfiguration solution and coordinating control strategy for power converters to enhance FRT and transient voltage support capability of a DFIG. It is found that feed forward terms in current controller of rotor side converter reduce steady state error during tracking. In transient reconfiguration during fault grid side converter comes in parallel with rotor side converter to share high rotor currents. A coordinated demagnetizing and reactive current control strategy with feed forward terms in controller designed for converters during transient conditions. The response of the DFIG wind turbine system with transient reconfiguration and coordinated power converter control to grid disturbances is simulated using MATLAB/Simulink®. Keywords: Doubly-fed induction generator, wind turbine, Fault ride through, Grid codes, transient reconfiguration, coordinated power converters control.
- Published
- 2018
20. Synthesis and biological evaluation of bergenin-1,2,3-triazole hybrids as novel class of anti-mitotic agents
- Author
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K. Suresh Babu, C. Venkata Rao, V. Lakshma Nayak, P. Pavan Kumar, Uppula Purushotham, S. Nishant Jain, Banoth Venkateswara Rao, G. Dileep Kumar, Bandi Siva, and Ashok Kumar Tiwari
- Subjects
Mitosis ,Antineoplastic Agents ,Antimitotic Agents ,01 natural sciences ,Biochemistry ,Polymerization ,HeLa ,Structure-Activity Relationship ,chemistry.chemical_compound ,Tubulin ,Drug Discovery ,medicine ,Humans ,Benzopyrans ,Doxorubicin ,Mallotus philippensis ,Cyclin B1 ,Molecular Biology ,Molecular Structure ,biology ,010405 organic chemistry ,Chemistry ,Organic Chemistry ,Bergenin ,Triazoles ,biology.organism_classification ,Tubulin Modulators ,0104 chemical sciences ,Molecular Docking Simulation ,010404 medicinal & biomolecular chemistry ,Chromones ,Docking (molecular) ,Cell culture ,Drug Design ,biology.protein ,medicine.drug - Abstract
In continuation of our investigation of pharmacologically-motivated natural products, we have isolated bergenin (1) as a major compound from Mallotus philippensis, which is deployed in different Indian traditional systems of medicine. Here, a series of bergenin-1,2,3-triazole hybrids were synthesized and evaluated for their potentials against a panel of cancer cell lines. Several of the hybrid derivatives were found more potent in comparison to parent compound bergenin (1). Among them, 4j demonstrated potent activity against A-549 and HeLa cell lines with IC50 values of 1.86 µM and 1.33 μM, respectively, and was equipotent to doxorubicin. Cell cycle analysis showed that 4j arrested HeLa cells at G2/M phase and lead to accumulation of Cyclin B1 protein. Cell based tubulin polymerization assays and docking studies demonstrated that 4j disrupts tubulin assembly by occupying colchicine binding pocket of tubulin.
- Published
- 2019
21. C-Worm Traffic Detection using Power Spectral Density and Spectral Flatness Measure
- Author
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Sushma Mergu and G. Dileep Kumar
- Subjects
Software_OPERATINGSYSTEMS ,business.industry ,Computer science ,Boot sector ,ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKS ,Information technology ,Denial-of-service attack ,computer.software_genre ,Computer security ,ComputingMilieux_MANAGEMENTOFCOMPUTINGANDINFORMATIONSYSTEMS ,Information sensitivity ,Trojan ,Computer worm ,Malware ,The Internet ,business ,computer - Abstract
As Internet and its technologies are improving with rapid pace, there are security threats growing with same pace. The malicious software such as worm is causing such threats to IT systems linked to information super highway. The worms are capable of replicating themselves and infect systems over network. Their traffic propagation can be detected by employing anti worm or virus software. However, there is a new type of worm that can camouflage itself so as to prevent anti worm software from identifying it. The difference between normal worm's traffic and C-worm's traffic can't be found when time domain is considered. However, in terms of frequency definitely it can be differentiated. Based on this hypothesis, this paper presents novel schemes such as PSD and SFM that are capable of differentiating the traffic of C-worm from background traffic. The empirical results revealed that our schemes are effecting in detecting camouflaging worms effectively besides identifying normal worms. Keywords - Traffic propagation, worm, camouflaging worm, time domain, and frequency domain. I. Introduction Worm is a word with broad meaning. It refers to any program which is malicious in nature. Such program could be a VIRUS, worm etc. They have common features which are also there with biological virus. The common features include that they replicate themselves and also propagate from one machine to another machine. The means of propagation is only through infected storage media and also networks of all kinds including those without wire. Active worms continuously strive to propagate themselves to other systems and make them insecure. This is a problem which has been around ever since the world came across malicious programs for the first time. Some worms include Slammer (2), Sasser (3) and Code-Red (1). Some worms will work together by forming bonnets and cause more damage to IT systems. The attacks made by such worms include DDoS; attack to obtain sensitive information; destroying data (5) and also put forth unwanted materials such as advertisements. Many such worms are commonly known as malware (malicious software). This includes virus as well. The virus could be boot sector virus, file virus, love virus, time bomb virus, Trojan virus and so on. There is enough evidence in the history that some people have made it their business to create malware and also solutions to prevent them. This is major problem in the world of computers. This man made evil will continue posing threats to IT systems and also cause the businesses to loose confidential information and thus loosing confidence and profits in the business (4), (6). Researchers also predicting the possibility of malicious programs such as bonnets to collaborate and cause more security threats to IT world. Such collaborated bonnets is known as super bots (7). As there were reports of worms causing major damage to IT systems, the past few years saw significant research in the area of worms. Worm detection and prevention is an essential task required by all systems involved in IT. Thus the presence of anti-worm software is felt and the same is done through research. The process of identifying the worms by observing their scan traffic much anti-worm software succeed in detecting and also preventing any damage to IT systems. The emergence of Internet and also other networking facilities and communication systems paved way for the increase of threats caused by worms. Studying different kinds of worms and their impact on the IT systems and also prevention techniques are to be given paramount importance. When a worm infects a system, it will propagate its traffic in the system to cause damage to its data. It also strives to propagate the traffic to other systems though infected storage media and networks to other systems in the real world. They keep on identifying IP addresses of systems in the world and infect them though the ways known to them. The common way they follow is generating scan traffic in the time domain and frequency domain. Thus they make all the systems attacked by worms vulnerable to security threats. There is a possibility of loosing companies' sensitive information that leads to collapse of business or losing in revenues in large scale. The patterns of the worms (2), (8), (9) are increasing day by day. The more patterns of worm propagation is known, the more possibility to detect and prevent them. The assumption of all software in the world that is sued to combat worms is that the worms generate scan traffic and try to replicate themselves and infect systems in the same network and remote networks. The patterns are generally having same characteristics so as to enable anti-worm to detect them. However, a new class of worm has come into existence. This new worm is capable of hiding its presence.
- Published
- 2012
22. APPLYING SIX-SIGMA IN HEALTH SERVICE: A STUDY OF CRITICAL SUCCESS FACTORS, CRITICAL TO QUALITY CHARACTERISTICS AND KEY PERFORMANCE INDICATORS IN MEDIUM SCALE HOSPITALS
- Author
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G Dileep and SS Rau
- Subjects
Engineering ,Process management ,business.industry ,Process (engineering) ,media_common.quotation_subject ,Six Sigma ,Identification (information) ,Health care ,Critical success factor ,Critical to quality ,Quality (business) ,Operations management ,Performance indicator ,business ,media_common - Abstract
The benefits of six-sigma quality standard implementation are realized by the manufacturing sector very well and most of the cases reaped astounding benefits. This paper presents an extensive review on the services, six-sigma, and study the Critical Success Factors, Critical to Quality Characteristics and Key Performance Indicators in medium scale hospitals in Tamilnadu, India. Can health care approach the near perfection of Six Sigma in actual practice? . General Electric has begun to apply the same Six Sigma methods that worked to improve its manufacturing processes to its other, more service-oriented businesses. We believe, however, that asking this question must not be an excuse for failing to embark on the journey. Health care now frequently produces defects at rates as high as 500,000 per million––as exemplified in failures to recognize and treat clinical depression (Wells et al. 1989) or control hypertension (Udvarhelyi et al. 1991). Enough examples of improvement exist to conclude that we can do much better. In order to improve health service quality focus on health service process is necessary. Six-sigma is a philosophy which also concentrates on the improvement of process. So, six-sigma if properly applied can be useful for health services. The wider applicability of six-sigma depends on identification of key performance indicators (KPIs) for different types of health service processes. A case study is conducted in a medium scale hospital to identify, analyze and rank the critical success factors for Six sigma implementation available in literature, critical to quality characteristics (CTQs) ,KPIs and hurdles in the hospitals which affect possible quality improvements. This study will be helpful to both practitioners and researchers.
- Published
- 2009
23. C-Worm Traffic Detection using Power Spectral Density and Spectral Flatness Measure
- Author
-
Iosr Journals, Sushma Mergu1 , G. Dileep Kumar, Iosr Journals, and Sushma Mergu1 , G. Dileep Kumar
- Published
- 2014
- Full Text
- View/download PDF
24. Village knowledge centers and the use of GIS-derived products in enhancing micro-level drought preparedness: A case study from South Central India
- Author
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R. Nagarajan, A.V.R. Kesava Rao, V. Balaji, and G. Dileep Kumar
- Subjects
Product (business) ,Geographic information system ,Geography ,Agriculture ,business.industry ,Preparedness ,Vulnerability ,Developing country ,Disease cluster ,business ,Environmental planning ,Information science - Abstract
Drought affects hundreds of millions of people in the developing world and causes serious disruption of social and economic activities. Preparedness is better than relief and information is the backbone of drought preparedness. In this paper we report the results from a study in the use of GIS-derived products to assess micro-level drought vulnerability, taking a cluster of 17 villages in the South Central India as the study area. An internet-connected rural information center, linked to village knowledge centers, played a key role in testing the utility of this product, and the associated local-level predictions for seasonal rainfall.
- Published
- 2007
25. Primary tuberculosis clinically presenting as gingival enlargement: a case report
- Author
-
C G Dileep, Sharma, A R, Pradeep, and B V, Karthikeyan
- Subjects
DNA, Bacterial ,Diagnosis, Differential ,Gingival Diseases ,Humans ,Female ,Mycobacterium tuberculosis ,Tuberculoma ,Child ,Polymerase Chain Reaction ,Tuberculosis, Oral - Abstract
Tuberculosis is a chronic systemic granulomatous disease which rarely affects the oral cavity. Oral lesions can be either primary or secondary to systemic tuberculosis, the former being rare. This is a never-before reported case of primary tuberculosis presenting as a localized diffuse gingival enlargement in an 11-year-old Indian female patient. The diagnosis was reached through identification of positive histopathological features, Tuberculin test results, presence of anti-tubercular antibodies confirmed by a polymerase chain reaction. In view of the recent increase in the incidence of tuberculosis and the prevalence of the same, it is reasonable to include tuberculosis in the differential diagnosis of gingival enlargements. This is essential to avoid any serious complications for both the clinician and patient due to a delay in the diagnosis of such a rare but plausible oral condition.
- Published
- 2006
26. Primary tuberculous gingival enlargement: a rare entity
- Author
-
Bangalore Varadhan, Karthikeyan, Avani Raju, Pradeep, and C G Dileep, Sharma
- Subjects
DNA, Bacterial ,Diagnosis, Differential ,Gingivoplasty ,Antitubercular Agents ,Humans ,Female ,Child ,Gingival Hypertrophy ,Tuberculosis, Oral - Abstract
With the advent of effective drug therapy, tuberculous lesions of the oral cavity have become so rare that they are frequently forgotten. Primary gingival tuberculosis is extremely rare and usually manifests as ulcer. We report the first case of primary tuberculosis manifesting as gingival enlargement, which was the only presenting sign of tuberculosis. Diagnosis was based on histopathology (hematoxin and eosin staining), complete blood count, polymerase chain reaction assay and immunologic investigation with the detection of antibodies against Mycobacterium tuberculosis. The possibility of gingival enlargement due to drugs, leukemia, fungus and sarcoidosis was ruled out. Antituberculous therapy over 6 months was followed by surgical excision of the residual enlargement under local anesthesia. After 1-year follow-up there was no recurrence of the disease. This case emphasizes the need for dentists to include tuberculosis in the differential diagnosis of gingival enlargement so that they may play a role in its early detection.
- Published
- 2006
27. Legal responses to the commodification of personal data in the era of Big Data: The paradigm shift from Data Protection towards Data Ownership
- Author
-
Argyro Karanasiou, Emile Douilhet, Kumar Singh, Manoj, Kumar G., Dileep, Singh, Manoj Kumar, and Gak, Dileep Kumar
- Subjects
Commodification ,business.industry ,Internet privacy ,Big data ,KD ,Context (language use) ,ComputingMilieux_LEGALASPECTSOFCOMPUTING ,Predictive analytics ,Public relations ,Asset (computer security) ,Political science ,Data Protection Act 1998 ,Property law ,business ,Raw data - Abstract
Big Data is a relatively recent phenomenon, but has already shown its potential to drastically alter the relationships between businesses, individuals, and governments. The issues surrounding privacy of the online users (Mayer-Shoenberger, Cukier 2013) and the overall ethical challenges involved (Schroeder, 2014) make big data a topical issue, especially in the aftermath of the Snowden revelations. Many organisations now control vast amounts of raw data, and those industry players with the resources to mine that data to create new information have a significant advantage in the big data market. The use of predictive analytics in processing information tracked across different platforms to identify trends in the behaviour of individuals further adds value to big data (Fotopoulou, 2014) and makes it an important asset for any commercial entity. This rapid commodification of personal data has given rise to a new approach with regard its legal protection in the era of big data: a shift from the traditional privacy protection regime to a wider protection under property law is considered by scholars as an appropriate legal response to the phenomenon of monetisation of personal data, once seen through the lens of big data (Victor, 2013).\ud \ud The aim of this chapter is to identify the legal grounds for the ownership of big data: who legally owns the petabytes and exabytes of information created daily? Does this belong to the users, the data analysts or to the data brokers and various infomediaries? The chapter presents a succinct overview of the legal ownership of big data by examining the key players in control of the information at each stage of the processing of big data. It then moves on to describe the current legislative framework with regard to data protection and concludes in additional techno-legal solutions offered to complement the law of big data in this respect, with a particular focus on the European context .
- Published
- 2016
28. Artificial Intelligence in Breast Cancer Screening and Diagnosis.
- Author
-
Dileep G and Gianchandani Gyani SG
- Abstract
Cancer is a disease that continues to plague our modern society. Among all types of cancer, breast cancer is now the most common type of cancer occurring in women worldwide. Various factors, including genetics, lifestyle, and the environment, have contributed to the rise in the prevalence of breast cancer among women of all socioeconomic strata. Therefore, proper screening for early diagnosis and treatment becomes a major factor when fighting the disease. Artificial intelligence (AI) continues to revolutionize various spheres of our lives with its numerous applications. Using AI in the existing screening process makes obtaining results even easier and more convenient. Faster, more accurate results are some of the benefits of AI methods in breast cancer screening. Nonetheless, there are many challenges in the process of the integration of AI that needs to be addressed systematically. The following is a review of the application of AI in breast cancer screening., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2022, Dileep et al.)
- Published
- 2022
- Full Text
- View/download PDF
29. Visible light photodegradation of 2,4-dichlorophenol using nanostructured NaBiS 2 : Kinetics, cytotoxicity, antimicrobial and electrochemical studies of the photocatalyst.
- Author
-
Kumar VGD, Balaji KR, Viswanatha R, Ambika G, Roopa R, Basavaraja BM, Chennabasappa M, Kumar CRR, Chen Z, Bui XT, and Santosh MS
- Subjects
- Catalysis, Chlorophenols, Kinetics, Light, Photolysis, Anti-Infective Agents, Ecosystem
- Abstract
Removal of the hazardous and endocrine-disrupting 2,4-dichlorophenol (2,4-DCP) from water bodies is crucial to maintain the sanctity of the ecosystem. As a low bandgap material (1.37 eV), NaBiS
2 was hydrothermally prepared and used as a potential photocatalyst to degrade 2,4-DCP under visible light irradiation. NaBiS2 appeared to be highly stable and remained structurally undeterred despite thermal variations. With a surface area of 6.69 m2 /g, NaBiS2 has enough surface-active sites to adsorb the reactive molecules and exhibit a significant photocatalytic activity. In alkaline pH, the adsorption of 2,4-DCP on NaBiS2 appeared to decrease whereas, the acidic and neutral environments favoured the degradation. An increase in the photocatalyst dosage enhanced the degradation efficiency from 81 to 86 %, because of higher vacant adsorbent sites and the electrostatic attraction between NaBiS2 and 2,4-DCP. The dominant scavengers degraded 2,4-DCP by forming a coordination bond between chlorine's lone pair of electrons and the vacant orbitals of bismuth, following the order hole> OH > singlet oxygen. Being non-toxic to both natural and aquatic systems, NaBiS2 exhibits antifungal properties at higher concentrations. Finally, the electron-rich NaBiS2 is an excellent electrocatalyst that effectively degrades organic pollutants and is a promising material for industrial and environmental applications., (Copyright © 2021 Elsevier Ltd. All rights reserved.)- Published
- 2022
- Full Text
- View/download PDF
30. Synthesis and biological evaluation of bergenin-1,2,3-triazole hybrids as novel class of anti-mitotic agents.
- Author
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Pavan Kumar P, Siva B, Venkateswara Rao B, Dileep Kumar G, Lakshma Nayak V, Nishant Jain S, Tiwari AK, Purushotham U, Venkata Rao C, and Suresh Babu K
- Subjects
- Antimitotic Agents chemical synthesis, Antineoplastic Agents chemical synthesis, Drug Design, Humans, Molecular Docking Simulation, Molecular Structure, Polymerization, Structure-Activity Relationship, Tubulin Modulators chemical synthesis, Antimitotic Agents pharmacology, Antineoplastic Agents pharmacology, Benzopyrans chemistry, Chromones chemical synthesis, Chromones pharmacology, Mitosis, Triazoles chemistry, Tubulin chemistry, Tubulin Modulators pharmacology
- Abstract
In continuation of our investigation of pharmacologically-motivated natural products, we have isolated bergenin (1) as a major compound from Mallotus philippensis, which is deployed in different Indian traditional systems of medicine. Here, a series of bergenin-1,2,3-triazole hybrids were synthesized and evaluated for their potentials against a panel of cancer cell lines. Several of the hybrid derivatives were found more potent in comparison to parent compound bergenin (1). Among them, 4j demonstrated potent activity against A-549 and HeLa cell lines with IC
50 values of 1.86 µM and 1.33 μM, respectively, and was equipotent to doxorubicin. Cell cycle analysis showed that 4j arrested HeLa cells at G2/M phase and lead to accumulation of Cyclin B1 protein. Cell based tubulin polymerization assays and docking studies demonstrated that 4j disrupts tubulin assembly by occupying colchicine binding pocket of tubulin., (Copyright © 2019. Published by Elsevier Inc.)- Published
- 2019
- Full Text
- View/download PDF
31. Prader-Willi locus Snord116 RNA processing requires an active endogenous allele and neuron-specific splicing by Rbfox3/NeuN.
- Author
-
Coulson RL, Powell WT, Yasui DH, Dileep G, Resnick J, and LaSalle JM
- Subjects
- Alleles, Alternative Splicing genetics, Animals, Brain metabolism, Brain pathology, Cell Nucleolus genetics, Cell Nucleolus metabolism, DNA-Binding Proteins, Disease Models, Animal, Humans, In Situ Hybridization, Fluorescence, Male, Mice, Transgenic, Neurons metabolism, Neurons pathology, Prader-Willi Syndrome physiopathology, Sequence Deletion genetics, Sleep genetics, Sleep physiology, Genomic Imprinting genetics, Nerve Tissue Proteins genetics, Nuclear Proteins genetics, Prader-Willi Syndrome genetics, RNA, Small Nucleolar genetics
- Abstract
Prader-Willi syndrome (PWS), an imprinted neurodevelopmental disorder characterized by metabolic, sleep and neuropsychiatric features, is caused by the loss of paternal SNORD116, containing only non-coding RNAs (ncRNAs). The primary SNORD116 transcript is processed into small nucleolar RNAs (snoRNAs), which localize to nucleoli, and their spliced host gene 116HG, which is retained at its site of transcription. While functional complementation of the SNORD116 ncRNAs is a desirable goal for treating PWS, the mechanistic requirements of SNORD116 RNA processing are poorly understood. Here we developed and tested a novel transgenic mouse which ubiquitously expresses Snord116 on both a wild-type and a Snord116 paternal deletion (Snord116+/-) background. Interestingly, while the Snord116 transgene was ubiquitously expressed in multiple tissues, splicing of the transgene and production of snoRNAs was limited to brain tissues. Knockdown of Rbfox3, encoding neuron-specific splicing factor neuronal nuclei (NeuN) in Snord116+/--derived neurons, reduced splicing of the transgene in neurons. RNA fluorescence in situ hybridization for 116HG revealed a single significantly larger signal in transgenic mice, demonstrating colocalization of transgenic and endogenous 116HG RNAs. Similarly, significantly increased snoRNA levels were detected in transgenic neuronal nucleoli, indicating that transgenic Snord116 snoRNAs were effectively processed and localized. In contrast, neither transgenic 116HG nor snoRNAs were detectable in either non-neuronal tissues or Snord116+/- neurons. Together, these results demonstrate that exogenous expression and neuron-specific splicing of the Snord116 locus are insufficient to rescue the genetic deficiency of Snord116 paternal deletion. Elucidating the mechanisms regulating Snord116 processing and localization is essential to develop effective gene replacement therapies for PWS.
- Published
- 2018
- Full Text
- View/download PDF
32. Primary tuberculosis clinically presenting as gingival enlargement: a case report.
- Author
-
Sharma CG, Pradeep AR, and Karthikeyan BV
- Subjects
- Child, DNA, Bacterial analysis, Diagnosis, Differential, Female, Humans, Mycobacterium tuberculosis genetics, Polymerase Chain Reaction, Tuberculoma pathology, Gingival Diseases pathology, Tuberculosis, Oral pathology
- Abstract
Tuberculosis is a chronic systemic granulomatous disease which rarely affects the oral cavity. Oral lesions can be either primary or secondary to systemic tuberculosis, the former being rare. This is a never-before reported case of primary tuberculosis presenting as a localized diffuse gingival enlargement in an 11-year-old Indian female patient. The diagnosis was reached through identification of positive histopathological features, Tuberculin test results, presence of anti-tubercular antibodies confirmed by a polymerase chain reaction. In view of the recent increase in the incidence of tuberculosis and the prevalence of the same, it is reasonable to include tuberculosis in the differential diagnosis of gingival enlargements. This is essential to avoid any serious complications for both the clinician and patient due to a delay in the diagnosis of such a rare but plausible oral condition.
- Published
- 2006
33. Primary tuberculous gingival enlargement: a rare entity.
- Author
-
Karthikeyan BV, Pradeep AR, and Sharma CG
- Subjects
- Antitubercular Agents therapeutic use, Child, DNA, Bacterial analysis, Diagnosis, Differential, Female, Gingival Hypertrophy surgery, Gingivoplasty, Humans, Tuberculosis, Oral diagnosis, Tuberculosis, Oral drug therapy, Gingival Hypertrophy etiology, Tuberculosis, Oral complications
- Abstract
With the advent of effective drug therapy, tuberculous lesions of the oral cavity have become so rare that they are frequently forgotten. Primary gingival tuberculosis is extremely rare and usually manifests as ulcer. We report the first case of primary tuberculosis manifesting as gingival enlargement, which was the only presenting sign of tuberculosis. Diagnosis was based on histopathology (hematoxin and eosin staining), complete blood count, polymerase chain reaction assay and immunologic investigation with the detection of antibodies against Mycobacterium tuberculosis. The possibility of gingival enlargement due to drugs, leukemia, fungus and sarcoidosis was ruled out. Antituberculous therapy over 6 months was followed by surgical excision of the residual enlargement under local anesthesia. After 1-year follow-up there was no recurrence of the disease. This case emphasizes the need for dentists to include tuberculosis in the differential diagnosis of gingival enlargement so that they may play a role in its early detection.
- Published
- 2006
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