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Structural and luminescence enhancement properties of Eu^(3+)/Ag nanocrystallites doped SiO_2-TiO_2 matrices

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Journal of Rare Earths 2013年第5期31卷 441-448页

作者： arun kumar K V Revathy K P Prathibha Vasudevan Sunil Thomas Biju P R Unnikrishnan N V School of Pure & Applied Physics Mahatma Gandhi University

We reported here the structural and optical characterisation of silver nanocrystallites/Eu3＋：SiO2-TiO2 matrices synthesised through sol-gel route. Structural characterisations were done by using energy dispersive spectroscopy （EDX）, X-ray diffraction （XRD）, Fourier transform infrared spectroscopy （FTIR）, atomic force microscope （AFM） and transmission electron microscopy （TEM） measurements and optical characterisations were performed by absorption and emission spectroscopy. The TEM and XRD measurements confirmed the presence of nanocrystals. A broad absorption band was observed due to surface plasmon resonance of silver nanocrystals. The effect of silver nanocrystals on the emission spectrum of Eu3＋ doped SiO2-TiO2 matrices was discussed. An attempt was made to explain this fluorescence enhancement by invoking phenomena such as energy transfer, asymmetry ratio, surface plasmon, surface roughness, crystallinity and grain boundary. Our analysis, based on the experimental results, suggested that all the phenomena except crystallinity and grain boundary had favourable effects on fluorescence enhancement. We also estimated the relevant parameters associated with the phenomena that affected the fluorescence emission from the Eu3＋ ions in the matrix. It was seen that the theoretical estimate of fluorescence enhancement agreed well with the experimental estimate.

关键词： sol-gel luminescence SiO2-TiO2 silver nanoparticles rare earths

Antioxidant and antipyretic properties of methanolic extract of Amaranthus spinosus leaves

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Asian Pacific Journal of Tropical Medicine 2010年第9期3卷 702-706页

作者： Bagepalli Srinivas Ashok kumar Kuruba Lakshman Jayaveera KN Devangam Sheshadri Shekar Avalakondarayappa arun kumar Bachappa Manoj Department of Pharmacognosy Sri K.V.College of PharmacyChickballapurKarnatakaIndia Department of Pharmacognosy PES College of PharmacyBangaloreKarnatakaIndia Department of Chemistry Jawaharlal Nehru Technological University of College of EngineeringAnantapurAndhra PradeshIndia Department of Pharmacology Sri K.V.College of PharmacyChickballapurKarnatakaIndia

Objective:Methanolic extract of Amaranthus spinosus（***） leaves was screened for antioxidant and antipyretic ***:Antioxidant activity was measured by l,l-diphenyl-2-picryl-hydrazile（DPPH） free radical scavenging,superoxide anion radical scavenging,hydroxyl free radical scavenging,nitric oxide radical scavenging,2,2 -azinobis-3- ethylbenzothiazole-6-sulfonic acid（ABTS） radical scavenging assays and total phenolic content was also *** activity of methanolic extract of *** was measured by yeast induced pyrexia method at concentration of 200 and 400 mg/kg using paracetamol as standard ***:Methanolic extract of *** showed potent antioxidant *** IC50 value was（87.50±3.52）μg/mL,（98.80±1.40）μg/mL,（106.25±0.20）μg/mL,（88.70±0.62）μg/mL and（147.50±2.61）μg/mL for DPPH,superoxide,hydroxyl,nitric oxide and ABTS radical scavenging *** extract of A spinosus showed significant（P<0.01） antipyretic activity.

关键词： Amaranthus spinosus Antioxidant activity Antipyretic activity

Serum uric acid level in newly diagnosed essential hypertension in a Nepalese population:A hospital based cross sectional study

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Asian Pacific Journal of Tropical Biomedicine 2014年第1期4卷 59-64页

作者： Bibek Poudel Binod kumar Yadav arun kumar Bharat Jha Kanak Bahadur Raut Department of Biochemistry Manipal College of Medical Sciences(MCOMS)Manipal Teaching Hospital(MTH) Research Institute of Clinical Medicine Chonbuk National University Medical School and Hospital Department of Biochemistry Institute of MedicineTribhuvan University Teaching Hospital(Institute of MedicineTUTH) Department of Internal.Medicine Institute of MedicineTribhuvan University Teaching Hospital(Institute of MedicineTUTH)

Objective:To develop the missing link between hyperuricemia and ***:The study was conducted in Department of Biochemistry in collaboration with Nephrology Unit of Internal Medicine *** was defined according to blood pressure readings by definitions of the Seventh Report of the Joint National *** 205newly diagnosed and untreated essential hypertensive cases and age-sex matched nonnotensive controls were enrolled in the *** potential confounding factors of hyperuricemia and hypertension in both cases and controls were *** acid levels in all participants were ***:Renal function between newly diagnosed hypertensive cases and nonnotensive healthy controls were *** mean serum uric acid observed in newly diagnosed hypertensive cases and in nonnotensive healthy controls were(290.05±87.03)μmol/L and(245.24±09.38)μmol/L respectively.A total of 59(28.8%)participants of cases and 28(13.7%)participants of controls had hyperuricemia(odds ratio 2.555(95%CI:1.549-4.213),P<0.00l).Conclusions:The mean serum uric acid leveb and number of hyperuricemic subjects were found to be significantly higher in cases when compared to controls.

关键词： Newly diagnosed hypertension Serum uric acid Hyperuricemia Joint National Committee

Study of temporal and spectral characteristics of the X-ray emission from solar flares

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Research in Astronomy and Astrophysics 2018年第10期18卷 33-48页

作者： Veena Choithani Rajmal Jain arun K.Awasthi Geetanjali Singh Sneha Chaudhari Som kumar Sharma Dept.of Physics Sh.M.M.Patel Institute of Sciences&ResearchKadi Sarva VishwavidyalayaGandhinagar 382015India CAS Key Laboratory of Geospace Environment Department of Geophysics and Planetary SciencesUniversity ofScience and Technology of ChinaHefei 230026China Physical Research Laboratory NavrangpuraAhmedabad 380009India

Temporal and spectral characteristics of X-ray emission from 60 flares of intensity ≥C class observed by the Solar X-ray Spectrometer （SOXS） during 2003-2011 are presented. We analyze the X-ray emission observed in four and three energy bands by the Si and Cadmium-Zinc-Telluride （CZT） detectors, respectively. The number of peaks in the intensity profile of the flares varies between 1 and 3. We find moderate correlation （R ~=0.2） between the rise time and the peak flux of the first peak of the flare irrespective of energy band, which is indicative of its energy-independent nature. Moreover, the magnetic field complexity of the flaring region is found to be highly anti-correlated （R = 0.61） with the rise time of the flares while positively correlated （R = 0.28） with the peak flux of the flare. The time delay between the peak of the X-ray emission in a given energy band and that in 25-30keV decreases with increasing energy, suggesting conduction cooling is dominant in the lower energies. Analysis of 340 spectra from 14 flares reveals that the peak of differential emission measure （DEM） evolution is delayed by 60-360 s relative to that of the temperature, and this time delay is inversely proportional to the peak flux of the flare. We conclude that temporal and intensity characteristics of flares are dependent on energy as well as the magnetic field configuration of the active region.

关键词： Sun X-rays, gamma rays - Sun magnetic fields - Sun flares - Sun corona

Pain management in mice using methanol extracts of three plants belongs to family Amaranthaceae

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Asian Pacific Journal of Tropical Medicine 2010年第7期3卷 527-530页

作者： Ashok kumar BS Lakshman K Jayaveera KN Vel Murgan C arun kumar PA Vinod kumar R Meghda Hegade Sridhar SM Department of Pharmacognosy.Sri K.V.College of Pharmacy ChickballapurKarnataka-562101India Department of Pharmacognosy PES College of PharmacyBangaloreKarnatakaIndia Department of Chemistry Jawaharlal Nehru Technological University of College of EngineeringAnantapurAndhra Pradesh.India Department of Pharmacology Sri K.V.College of PharmacyChickbaltapurKarnataka-562101.India Department of Pharmacology Sri K.V.College of PharmacyChickballapurKarnataka-562101India

Objective:To investigate the analgesic activity of methanolic extract of Amaranthus viridis(A. viridis),Amaranthus caudatus(***) and Amaranthus spinosus(***).Methods:In this study,the analgesic activity of methanol extracts of all three plants at doses of 200 and 400 mg/kg were investigated by acetic acid-induced writhings test,hot plate test and tail immersion test for ***:It was found that all the three plants showed significant pain management effect(P<0.01) at a dose of 400 mg/kg,but showed a less significant effect at a dose of 20 mg/kg in the entire tests used for evaluation of analgesic activities(P<0.05).Conclusions:Methanol extracts of ***,*** and *** show potent analgesic activities,and this study provides the scientific proof for their traditional claims.

关键词： Amaranthus viridis Linn Amaranthus caudatus Linn Amaranthus spinosus Linn Analgesic Acetic acid induced writhings

Effect of Exercise on NAFLD and Its Risk Factors:Comparison of Moderate versus Low Intensity Exercise

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Journal of Clinical and Translational Hepatology 2020年第2期8卷 120-126页

作者： Preetam Nath Manas kumar Panigrahi Manoj kumar Sahu Jimmy Narayan Ranjan kumar Sahoo Ananya Apurba Patra Satyaswarup Jena arun kumar Patnaik Anjan Jena Shivaram Prasad Singh Department of Gastroenterology&Hepatology Kalinga Institute of Medical SciencesBhubaneswarOdishaIndia Department of Gastroenterology All India Institute of Medical SciencesBhubaneswarOdishaIndia Department of Gastroenterology IMS and SUM HospitalBhubaneswarOdishaIndia Department of Radiodiagnosis&Imaging Kalinga Institute of Medical SciencesBhubaneswarOdishaIndia Department of Radiology IMS and SUM HospitalBhubaneswarOdishaIndia Dispensary Biju Patnaik State Police AcademyBhubaneswarOdishaIndia Department of Gastroenterology S.C.B.Medical College753007 CuttackOdishaIndia

Background and Aims: Lifestyle (exercise and dietary) modification is the mainstay of treatment for non-alcoholic fatty liver disease (NAFLD). However, there is paucity of data on effect of intensity of exercise in management of NAFLD, and we aimed to study the effect of variable intensities of exercise on NAFLD. Methods: The study was performed in the Department of Gastroenterology of the SCB Medical Col-lege, Cuttack and the Biju Patnaik State Police Academy, Bhu-baneswar. The subjects were police trainees [18 in a moderate intensity exercise group (MIG) and 19 in a low in-tensity exercise group (LIG)] recruited for a 6-month physical training course (261.8 Kcalorie, 3.6 metabolic equivalent in MIG and 153.6 Kcalorie, 2.1 metabolic equivalent in LIG). NAFLD was diagnosed by ultrasonography, with exclusion of all secondary causes of steatosis. All participants were eval-uated by anthropometry (weight, height, body mass index (BMI), waist circumference), assessed for blood pressure and biochemical parameters (blood glucose, liver function test, lipid profile, serum insulin), and subjected to transabdo-minal ultrasonography before and after 6 months of physical training, and the results were compared. Results: Both the groups had similar BMI, fasting plasma glucose, AST, gamma-glutamyl transpeptidase, insulin, and homeostatic model as-sessment-insulin resistance (known as HOMA-IR) (p>0.05). However, subjects in the LIG were older and had lower alanine transaminase, higher triglycerides and lower high-density lip-oproteins than MIG subjects. There was a significant reduc-tion in BMI (27.0±2.1 to 26.8±2.0;p=0.001), fasting blood glucose (106.7±21.6 to 85.8±19.0;p<0.001), serum trigly-cerides (167.5±56.7 to 124.6±63.5;p=0.017), total choles-terol (216.8±29.2 to 196.7±26.6;p=0.037), low-density lipoprotein cholesterol (134.6±21.4 to 130.5±21.9;p=0.010), serum aspartate transaminase (39.3±32.2 to 30.9±11.4;p<0.001), serum alanine transaminase (56.6 ±28.7 to 33.0±11.3;p<0.

关键词： Exercise NAFLD Intensity Physical activity

Abdominal tuberculosis of the gastrointestinal tract: Revisited

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World Journal of Gastroenterology 2014年第40期20卷 14831-14840页

作者： Uma Debi Vasudevan Ravisankar Kaushal Kishor Prasad Saroj Kant Sinha arun kumar Sharma Division of GE Radiology Department of Superspeciality of Gastroenterology Postgraduate Institute of Medical Education and Research Chandigarh 160 012 India Department of Radiodiagnosis Postgraduate Institute of Medical Education and Research Chandigarh 160 012 India Division of GE Histopathology Department of Superspeciality of Gastroenterology Postgraduate Institute of Medical Education and Research Chandigarh 160 012 India Department of Superspeciality of Gastroenterology Postgraduate Institute of Medical Education and Research Chandigarh 160 012 India Division of GE Virology Department of Superspeciality of Gastroenterology Postgraduate Institute of Medical Education and Research Chandigarh 160 012 India

Abdominal tuberculosis is an increasingly common disease that poses diagnostic challenge,as the nonspecific features of the disease which may lead to diagnostic delays and development of *** condition is regarded as a great mimicker of other abdominal pathology.A high index of suspicion is an important factor in early *** involvement mayoccur in the gastrointestinal tract,peritoneum,lymphnodes or solid *** investigative methods have been used to aid in the diagnosis of abdominal *** diagnosis and initiation of antituberculous therapy and surgical treatment are essential to prevent morbidity and *** of the patients respond very well to standard antitubercular therapy and surgery is required only in a minority of *** plays an important role in diagnosis of abdominal tuberculosis because early recognition of this condition is *** reviewed our experience with the findings on various imaging modalities for diagnosis of this potentially treatable disease.

关键词： Tuberculosis Abdomen Extrapulmonary Gastrointestinal tract

Cynodon dactylon extract ameliorates cognitive functions and cerebellar oxidative stress in whole body irradiated mice

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Asian Pacific Journal of Tropical Biomedicine 2019年第7期9卷 278-283页

作者： Roopesh Poojary Nayanatara arun kumar Reshma kumarchandra Vinodini NA Bhagyalakshmi K Ganesh Sanjeev Department of Physiology Kasturba Medical CollegeMangaloreManipal Academy of Higher EducationManipalKarnatakaIndia Department of Biochemistry Kasturba Medical CollegeMangaloreManipal Academy of Higher EducationManipalKarnatakaIndia Microtron Centre Department of Studies in PhysicsMangalore UniversityMangalagangotriKarnatakaIndia

Objective: To explore the effect of hydroalcoholic extract of Cynodon dactylon on the whole body radiation-induced oxidative status of the cerebellum and cognitive impairments in mice. Methods: Swiss albino mice were randomly divided into the control group, radiation control group, low dose and high dose Cynodon dactylon extract treated groups and pre-treated with Cynodon dactylon extract before irradiation. Cynodon dactylon extract was administered for 7 d daily in low dose(0.25 g/kg) and high dose(1 g/kg). On day 7, mice were irradiated with a sublethal dose of 5 Gy gamma rays. Motor coordination was assessed by elevated rotarod test and spatial memory was studied by water maze test. Subsequently, biochemical markers(glutathione, lipid peroxidation and nitric oxide levels) in the cerebellum were evaluated. Results: The gamma irradiated group showed significant impairment in motor coordination and spatial memory compared to normal mice. Mice treated by Cynodon dactylon extract prior to gamma radiation showed good improvement in both paradigms compared to the radiation control group. Moreover, glutathione level was increased, while lipid peroxidation and nitric oxide levels were significantly reduced in mice receiving low dose and high dose of Cynodon dactylon extract compared to the radiation control group. Conclusions: The present study suggests the neuroprotective role of Cynodon dactylon against radiation-induced cognitive impairment and oxidative stress on the cerebellum of mice.

关键词： Cerebellum Radiation Cognition Cynodon dactylon Memory

Prognostic Kalman Filter Based Bayesian Learning Model for Data Accuracy Prediction

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Computers, Materials & Continua 2022年第7期72卷 243-259页

作者： S.Karthik Robin Singh Bhadoria Jeong Gon Lee arun kumar Sivaraman Sovan Samanta A.Balasundaram Brijesh kumar Chaurasia S.Ashokkumar Department of ECE College of Engineering and TechnologySRM Institute of Science and TechnologyVadapalaniChennai600026India Department of CSE Birla Institute of Applied Sciences(BIAS)BhimtalUttarakhand263136India Division of Applied Mathematics Wonkwang University460Iksan-DaeroIksan-SiJeonbuk54538Korea School of Computer Science and Engineering Vellore Institute of Technology(VIT)Chennai600127India Department of Mathematics Tamralipta MahavidyalayaWest Bengal721636India School of Computer Science and Engineering Center for Cyber Physical SystemsVellore Institute of Technology(VIT)Chennai600127India Indian Institute of Information Technology(IIIT) LucknowUttar Pradesh226002India Department of Computer Science and Engineering Saveetha School of EngineeringSIMATSChennai602105India

Data is always a crucial issue of concern especially during its prediction and computation in digital *** paper exactly helps in providing efficient learning mechanism for accurate predictability and reducing redundant data *** also discusses the Bayesian analysis that finds the conditional probability of at least two parametric based predictions for the *** paper presents a method for improving the performance of Bayesian classification using the combination of Kalman Filter and *** method is applied on a small dataset just for establishing the fact that the proposed algorithm can reduce the time for computing the clusters from *** proposed Bayesian learning probabilistic model is used to check the statistical noise and other inaccuracies using unknown *** scenario is being implemented using efficient machine learning algorithm to perpetuate the Bayesian probabilistic *** also demonstrates the generative function forKalman-filer based prediction model and its *** paper implements the algorithm using open source platform of Python and efficiently integrates all different modules to piece of code via Common Platform Enumeration(CPE)for Python.

关键词： Bayesian learning model kalman filter machine learning data accuracy prediction