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Joseph, Stalin,Kempaiah, Devaraju M.,Benzigar, Mercy,Baskar, Arun V.,Talapaneni, Siddulu N.,Jhung, Sung Hwa,Park, Dae-Hwan,Vinu, Ajayan The Royal Society of Chemistry 2017 Journal of Materials Chemistry A Vol.5 No.40
<P>In this work, we report a simple and versatile method for the preparation of mesoporous carbon nitrides (MCNs) functionalized with highly dispersed chromium oxide nanoparticles by using a metal organic framework, MIL-100(Cr), as a template and aminoguanidine hydrochloride (AG) as a high nitrogen content single molecular precursor. We are able to synthesise these metal oxide functionalized MCN materials with single step carbonization but without using any toxic template removal process using HF or NaOH. The absence of a washing procedure with toxic acid also allows the incorporation of a large amount of metal oxide particles inside the porous channels of MCNs. The obtained MCN materials exhibit a high specific surface area and a large pore volume. The AG to template ratios are varied to control the amine functional groups and the textural parameters including the specific surface area and pore volume. It is found that the AG to template ratio of 1.5 is the best condition to obtain MCNs with a specific surface area of 1294 m<SUP>2</SUP> g<SUP>−1</SUP>, which is the highest value reported so far for MCN-based materials. FT-IR and XPS results reveal that the prepared materials contain free NH2 groups within the CN network which help to anchor metal oxide nanoparticles and provide highly dispersed basic sites. These functionalized MCN materials are also used as adsorbents for CO2 capture. Among the materials studied, the MCN with the highest specific surface area shows the largest CO2 adsorption capacity (16.8 mmol g<SUP>−1</SUP>) which is much higher than those of MCN materials prepared from SBA-15 and KIT-6, activated carbon, MIL-100(Cr), SBA-15, and multiwalled carbon nanotubes. This high adsorption capacity is mainly due to the strong synergistic effect between the MCN with high specific surface area and highly dispersed metal oxide nanoparticles.</P>
Size dependent structural and magnetic behaviour of CaFe2O4
Arvind Samariya,S.N. Dolia,Arun S. Prasad,P.K. Sharma,S.P. Pareek,M.S. Dhawan,Sudhish Kumar 한국물리학회 2013 Current Applied Physics Vol.13 No.5
CaFe2O4 nanocrystalline powders were synthesized through solegel treatment in which the stoichiometric mixing of various nitrates involving calcium and iron in presence of citric acid was performed. Subsequently, the as prepared sample was annealed at various temperatures in order to obtain the fine distribution of size including the bulk counterpart. The samples were then characterized using powder X-ray diffraction followed by 57Fe Mössbauer spectroscopy, SQUID as well as vibrating sample magnetometry. The results of spectroanalyses revealed that the samples were formed in single phase cubic spinel structure and exhibits room temperature superparamagnetism, except the bulk one, which crystallizes in characteristic orthorhombic structure of CaFe2O4 and displays trivial coercivity and remanent magnetization at room temperature.
Development and characterization of a new Bombyx mori cell line for protein expression
Arun M. Khurad,Ravindra S. Bahekar,Min-Juan Zhang,Ashish D. Tiple,Jae Man Lee,Chuan Xi Zhang,Takahiro Kusakabe 한국응용곤충학회 2013 Journal of Asia-Pacific Entomology Vol.16 No.1
A Bombyx mori continuous cell line, designated DZNU-Bm-17, was established from larval ovaries. The cells were initially grown in MGM-448 insect cell culture medium supplemented with 10% fetal bovine serum and 3% heat inactivated B. mori hemolymph at 25±1 °C and later adapted gradually to TNM-FH medium. Partially adhered refractive cells were the predominant cell type in the culture. The cells took about 1055 days to complete 100 passages in TNM-FH medium. The population doubling time of the cell line was about 30–34 h at 25±1 °C. The cell population was largely diploid, but a few triploids and tetraploids were also observed. DNA profiles using simple sequence repeat loci established the differences between the DZNU-Bm-1, Bm-5, DZNU-Bm-12, DZNU-Bm-17, and BmN cell lines. The cell line was susceptible to budded virus of B. mori nucleopolyhedrovirus (BmNPV), and 85–92% of the cells harbored BmNPV with an average of 15 occlusion bodies/infected cell. The cells expressed the luciferase and green fluorescent proteins using the BmNPV bacmid vector.Wesuggest the usefulness of the DZNU-Bm-17 cell line for BmNPV-based baculoviral expression studies.
( Arun T Nair ),( Vadivelan Ramachandran ),( Nanjan M Joghee ),( Shanish Antony ),( Gopalakrishnan Ramalingam ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2018 Journal of Neurogastroenterology and Motility (JNM Vol.24 No.1
Recent investigations suggest that gut microbiota affects the brain activity through the microbiota-gut-brain axis under both physiological and pathological disease conditions like Parkinson’s disease. Further dopamine synthesis in the brain is induced by dopamine producing enzymes that are controlled by gut microbiota via the microbiota-gut-brain axis. Also alpha synuclein deposition and the associated neurodegeneration in the enteric nervous system that increase intestinal permeability, oxidative stress, and local inflammation, accounts for constipation in Parkinson’s disease patients. The trigger that causes blood brain barrier leakage, immune cell activation and inflammation, and ultimately neuroinflammation in the central nervous system is believed to be due to the chronic low-grade inflammation in the gut. The non-motor symptoms that appear years before motor symptoms could be reliable early biomarkers, if they could be correlated with the established and reliable neuroimaging techniques or behavioral indices. The future directions should therefore, focus on the exploration of newer investigational techniques to identify these reliable early biomarkers and define the specific gut microbes that contribute to the development of Parkinson’s disease. This ultimately should pave the way to safer and novel therapeutic approaches that avoid the complications of the drugs delivered today to the brain of Parkinson’s disease patients. (J Neurogastroenterol Motil 2018;24:30-42)
M. Navaneetha Krishnan,S. Suresh,S. C. Vettivel,C. Emmy Prema,J. Arun,P. Thirunamakodi 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.5
The different percentages of boron carbide (B4C) reinforced Magnesium metal matrix composites were processed usingPowder Metallurgy method. The characterizations are performed by Scanning Electronic Microscope (SEM), X-ray Diffractionpattern, Electron Backscattered Diffraction, and Energy Dispersive Spectrum. The texture analysis of the composites isconducted via an image processing method. Wear tests are executed in the dry sliding state under ambient room conditions. The three levels Box-Behnken design of Response Surface Methodology has been selected to create the mathematical modelsfor the three variables (weight percentage of B4C,sliding velocity, and load) to predict the responses namely specific wearrate (SWR) and coefficient of friction (COF). The developed model is validated and analyzed through the Analysis of variance(ANOVA). This model has a 95% efficient confidence to forecast the COF and SWR. The worn surface features areextracted and analyzed through an image processing technique. The roughness measurement of the worn surfaces is executedvia Atomic Force Microscopy analysis.