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- 저자 : Arun, kumar B.R (검색결과 554 건)
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STUDY OF ROTATIONAL BAND STRUCTURE OF EVEN-EVEN 132;134SM NUCLEI
ARUN GUPTA,SURBHI GUPTA,SIMI GUPTA,SURAM SINGH,ARUN BHARTI 장전수학회 2021 Proceedings of the Jangjeon mathematical society Vol.24 No.4
The study of neutron-decient nuclei in the A130 mass region has been an interesting subject in nuclear structure physics as this region is considered to be transitional region. In the present work, the positive parity rotational band structure of even-even 132,134Sm up to the high spin states has been studied in a microscopic frame work of calculations known as Projected Shell Model (PSM). Yrast spectra for 132,134Sm have been obtained from the PSM calculations and has been found to be in good agreement with the available experimental data. Besides this, the present calculations have also reported the occurrence of back bending at the same spins at which experimental data shows in both the nuclei.
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Hot stage microscopy and its applications in pharmaceutical characterization
Kumar Arun,Singh Pritam,Nanda Arun 한국현미경학회 2020 Applied microscopy Vol.50 No.1
Hot stage microscopy (HSM) is a thermal analysis technique that combines the best properties of thermal analysis and microscopy. HSM is rapidly gaining interest in pharmaceuticals as well as in other fields as a regular characterization technique. In pharmaceuticals HSM is used to support differential scanning calorimetry (DSC) and thermo-gravimetric analysis (TGA) observations and to detect small changes in the sample that may be missed by DSC and TGA during a thermal experiment. Study of various physical and chemical properties such sample morphology, crystalline nature, polymorphism, desolvation, miscibility, melting, solid state transitions and incompatibility between various pharmaceutical compounds can be carried out using HSM. HSM is also widely used to screen cocrystals, excipients and polymers for solid dispersions. With the advancements in research methodologies, it is now possible to use HSM in conjunction with other characterization techniques such as Fourier transform infrared spectroscopy (FTIR), DSC, Raman spectroscopy, scanning electron microscopy (SEM) which may have additional benefits over traditional characterization techniques for rapid and comprehensive solid state characterization.
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Guava (Psidium guajava L.) Powder as an Antioxidant Dietary Fibre in Sheep Meat Nuggets
Verma, Arun K.,Rajkumar, V.,Banerjee, Rituparna,Biswas, S.,Das, Arun K. Asian Australasian Association of Animal Productio 2013 Animal Bioscience Vol.26 No.6
This study was conducted to explore the antioxidant potential and functional value of guava (Psidium guajava L.) powder in muscle foods. Guava powder was used as a source of antioxidant dietary fibre in sheep meat nuggets at two different levels i.e., 0.5% (Treatment I) and 1.0% (Treatment II) and its effect was evaluated against control. Guava powder is rich in dietary fibre (43.21%), phenolics (44.04 mg GAE/g) and possesses good radical scavenging activity as well as reducing power. Incorporation of guava powder resulted in significant decrease (p<0.05) in pH of emulsion and nuggets, emulsion stability, cooking yield and moisture content of nuggets while ash and moisture content of emulsion were increased. Total phenolics, total dietary fibre (TDF) and ash content significantly increased (p<0.05) in nuggets with added guava powder. Product redness value was significantly improved (p<0.05) due to guava powder. Textural properties did not differ significantly except, springiness and shear force values. Guava powder was found to retard lipid peroxidation of cooked sheep meat nuggets as measured by TBARS number during refrigerated storage. Guava powder did not affect sensory characteristics of the products and can be used as source of antioxidant dietary fibre in meat foods.
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Arun Karnwal 경희대학교 융합한의과학연구소 2022 Oriental Pharmacy and Experimental Medicine Vol.22 No.3
Safely management of food spoilage and foodborne illness is primarily achieved by applying chemical additives that have adverse effects along with health risk, increment chemical in food, and reduced bacterial susceptibility to antimicrobials. In the present study, antimicrobial efficacy of extracts from 3 different flowers (Hibiscus rosa sinensis, Chrysanthemum indicum, and Calendula officinalis) was examined towards seven food poisoning bacterial strains, four gram-positive strains (Staphylococcus aureus MTCC 87, Bacillus cereus MTCC 430, Clostridium perfringens MTCC 450, Listeria monocytogenes MTCC 657), and three gram-negative strains (Escherichia coli MTCC 43, Salmonella typhi MTCC 1264 and Pseudomonas aeruginosa MTCC424) using well diffusion assay. Aqueous extracts from all three of the flowers were similarly efficient with variable antimicrobial efficiency against the examined bacterial strains, while ethanol and methanol extracts from C. officinalis were highly efficient against all tested pathogenic bacteria. Ethanolic extract of C. indicum was the most efficient flower extract after C. officinalis against C. perfringens, L. monocytogenes, and S. typhi. H. rosa sinensis ethanol extract exhibited bactericidal action against S. aureus, B. cereus, and P. aeruginosa. For most extracts, the minimum inhibitory concentration (MIC) ranged from 3.75 to 7.5% and minimum bactericidal concentration (MBC) of 1.87–3.75% except for C. perfringens, and L. monocytogenes those were less sensitive with MIC 20%, and MBC 20%. Such flower extracts, which are potentially efficient, would be utilized to manage foodborne illness and protect food items from spoilage and minimize safety hazards generated due to chemically preservatives.
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Arun-Kumar Kaliya-Perumal,Yu-Cheng Yeh,Chi-An Luo,Kit-Yang Joey-Tan 대한정형외과학회 2017 Clinics in Orthopedic Surgery Vol.9 No.1
Background: The technique used to administer a selective nerve root block (SNRB) varies depending on individual expertise. Both the anteroposterior (AP) subpedicular approach and oblique Scotty dog subpedicular approach are widely practiced. However, the literature does not provide a clear consensus regarding which approach is more suitable. Hence, we decided to analyse the procedural parameters and clinical outcomes following SNRBs using these two approaches. Methods: Patients diagnosed with a single lumbar herniated intervertebral disc (HIVD) refractory to conservative management but not willing for immediate surgery were selected for a prospective nonrandomized comparative study. An SNRB was administered as a therapeutic alternative using the AP subpedicular approach in one group (n = 25; mean age, 45 ± 5.4 years) and the oblique Scotty dog subpedicular approach in the other group (n = 22; mean age, 43.8 ± 4.7 years). Results were compared in terms of the duration of the procedure, the number of C-arm exposures, accuracy, pain relief, functional outcome and the duration of relief. Results: Our results suggest that the oblique Scotty dog subpedicular approach took a significantly longer duration (p = 0.02) and a greater number of C-arm exposures (p = 0.001). But, its accuracy of needle placement was 95.5% compared to only 72% using the AP subpedicular approach (p = 0.03). There was no significant difference in terms of clinical outcomes between these approaches. Conclusions: The AP subpedicular approach was simple and facile, but the oblique Scotty dog subpedicular approach was more accurate. However, a brief window period of pain relief was achieved irrespective of the approaching technique used.
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Deposition of Cu2ZnSnS4 Thin Films by Magnetron Sputtering and Subsequent Sulphurization
Arun Khalkar,임광수,유성만,Shashikant P. Patole,유지범 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.1
Top-down magnetron sputtering with subsequent, separate sulphurization was used to deposit Cu2ZnSnS4 (CZTS) absorber layers for solar cells. Cu, ZnS and SnS targets were used to deposit the absorber layers onto soda lime glass substrates. The sputtering system was first calibrated for individual Cu, ZnS and SnS deposition. CZTS thin film was then deposited by co-sputtering followed by annealing at 530°C in sulphurous conditions at atmospheric pressure for 30 minutes. Scanning electron microscopy, x-ray diffraction, Raman and UV-visible absorption spectroscopy were used to characterize the absorber film. It was found to have properties potentially suitable for use in high-efficiency solar cells. These include phonon peaks corresponding to quaternary CZTS, a high absorption coefficient of 1.1 × 105 c m−1, a direct optical band gap of 1.5 eV, a kesterite CZTS phase and stoichiometric ratios of Cu/[Zn+Sn] = 0.82 and Zn/Sn = 1.19.
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Carbon quantum dots supported ZnO sphere based photocatalyst for dye degradation application
Arun Velumani,Prabhu Sengodan,Priyadharsan Arumugam,Ramesh Rajendran,Sivakumar Santhanam,Maadeswaran Palanisamy 한국물리학회 2020 Current Applied Physics Vol.20 No.10
A Carbon quantum dots supported ZnO hollow Sphere (ZnO/C-dots) were synthesized through a solvothermal method using polyethylene glycol 400 (PEG 400) as a solvent. The phase and crystal structure of as-prepared ZnO/C-dots photocatalyst were characterized by powder X-ray diffraction (XRD). The surface morphology and size of the composite were analyzed using field emission scanning microscopy (FE-SEM). The optical properties of the as-prepared nanocomposites were examined using UV–visible (UV–Vis) spectrometer. The photocatalytic activity of pure ZnO and ZnO/C-dots nanocomposites were evaluated by the degradation of methylene blue (MB) under UV–Visible light irradiation. The ZnO/C-dots nanocomposites exhibited maximum photocatalytic MB dye degradation efficiency of 96% which is much higher that the pure ZnO (63%). The enhanced photocatalytic activity of ZnO/C-dots is due to the extended light absorption in the visible region and suppressed photoexcited electron-hole pair recombination rate. Moreover, the activity of photocatalyst after five cycles exhibits high stability, which is vital for the sustainable photocatalytic procedures. It is concluded that the prepared ZnO/Cdots composite have low cost, good stability and has a great potential application for Photocatalytic dye degradation.
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Arun, Muthukrishnan,Subramanyam, Kondeti,Mariashibu, Thankaraj Salammal,Theboral, Jeevaraj,Shivanandhan, Ganeshan,Manickavasagam, Markandan,Ganapathi, Andy Humana Press 2015 Applied biochemistry and biotechnology Vol.175 No.4
<P>Soybean is a recalcitrant crop to Agrobacterium-mediated genetic transformation. Development of highly efficient, reproducible, and genotype-independent transformation protocol is highly desirable for soybean genetic improvement. Hence, an improved Agrobacterium-mediated genetic transformation protocol has been developed for cultivar PK 416 by evaluating various parameters including Agrobacterium tumefaciens strains (LBA4404, EHA101, and EHA105 harboring pCAMBIA1304 plasmid), sonication duration, vacuum infiltration pressure, and vacuum duration using cotyledonary node explants of soybean prepared from 7-day-old seedlings. The transformed plants were successfully developed through direct organogenesis system. Transgene expression was assessed by GUS histochemical and gfp visual assays, and integration was analyzed by PCR and Southern blot hybridization. Among the different combinations and durations evaluated, a maximum transformation efficiency of 18.6 % was achieved when the cotyledonary node explants of cv. PK 416 were sonicated for 20 s and vacuum infiltered for 2 min at 250 mmHg in A. tumefaciens EHA105 suspension. The amenability of the standardized protocol was tested on four more soybean cultivars JS 90-41, Hara Soy, Co 1, and Co 2 in which all the cultivars responded favorably with transformation efficiency ranging from 13.3 to 16.6 %. The transformation protocol developed in the present study would be useful to transform diverse soybean cultivars with desirable traits.</P>
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