-phases of nickel hydroxide and cobalt hydroxide samples crystallize in cadmium iodide type structure. -cobalt hydroxide on oxidation generates -CoOOH which crystallized in 3R 1 polytype while the structure of -phase of NiOOH polytype is less well understood. -and bc -phases of nickel hydroxide samples were prepared by using ammonium hydroxide and sodium hydroxide as precipitating agents. Powder X-ray diffraction data shows that -phase of nickel hydroxide is perfectly crystalline in nature while bc -phase of nickel hydroxide is poorly ordered. -and bc -phases of nickel hydroxide samples were subjected to chemical oxidation using sodium hypochlorite. The oxidized phases of -and bc -phases of nickel oxyhydroxide are highly disordered and the broadening of reflections in the powder X-ray diffraction patterns is due to the presence of structural disorder, variations in the crystallite size, and strain. On reduction of -and bc -phases of nickel oxyhydroxide, the powder X-ray diffraction patterns visually match the powder X-ray diffraction data of the pristine phases of -and bc -phases of nickel hydroxide indicating that the -phase of nickel hydroxide does not transform to bc -phase of nickel hydroxide, but the particle sizes are significantly affected.
Calcium oxide was used as photocatalyst for the degradation of indigo carmine dye solution in the visible, long UV, and short UV radiation. We have investigated the effectiveness of degradation of indigo carmine dye solution at pH 9 and 12 using calcium oxide with the particle size of 30-36 nm by varying the concentration, dose of adsorbent, and duration. It has been found that the degradation of indigo carmine dye is effective at pH = 9, when 0.12 g of calcium oxide was used. The nature of interaction between calcium oxide and indigo carmine dye was discussed.
In this article, the binding abilities of arginine, citrulline, N -acetyl citrulline and thiocitrulline on the active sites of SARS-COV-2 protease have been investigated using in-silico studies. All the above ligands bind selectively and preferentially to Cys-145 active site and also to other amino acids surrounding to it in the main protease. Of which arginine forms less number of weaker bonds compared to the other ligands, it by itself is a precursor for the formation of citrulline analogues with in the cell. Major advantage of using the above ligands is that in addition to its preferential binding, they have the ability to increase the immunity by assisting NO generation. Our results show that N -acetyl citrulline, citrulline, thiocitrulline and arginine may be used as a supplement during the treatment of SARS-COV-2.
We have used spectroscopic technique for the detection of melamine. The effect of melamine on the colour as well as the pH of bromophenol, methyl red and alizarin red dye solutions was examined at different mole ratios. It is found that we observe color transition and the absorption maxima for bromophenol were at 598 nm, while for methyl red, and alizarin red-S dye they are at 520 nm and 423 nm, respectively. We observe an increase in the absorption intensities at 598 nm with increase in the concentration of melamine in bromophenol blue dye. The absorption intensities at 520 nm decreases and new peak at 420 nm emerges in methyl red dye-melamine mixture. While the absorption intensities at 420 nm decreases and 520 nm peak emerges in alizarin red S dye-melamine at higher mole ratios. The results indicate that we can choose the appropriate dye of suitable range to detect the concentration of melamine from 3 to 206 mg dm−3. The results demonstrate possible use of the simple method for the qualitative and quantitative detection of melamine in adulterated food samples.
<p><b>To</b></p> <p><b>Editor in Chief</b></p> <p><b>Chemarxiv</b><b></b></p> <p> </p> <p><b>Respected Sir/Madam</b> </p> <p> </p> <p><b>Subject</b>: submission of preprint of an article to ChemRxiv on molecular docking studies of arginine and its structural analogues on COV-19 for publication.</p> <p> </p> <p>I am herewith submitting the preprint of an article entitled “<b>Binding ability studies of arginine, citrulline, N-acetyl citrulline and thiocitrulline with SARS Cov-2 main protease using molecular docking studies.</b>” for publication as preprint in “ChemRxiv”.</p> <p>In this paper the binding abilities of arginine, citrulline, N-acetyl citrulline and thiocitrulline with SARS-COV-2 protease have been examined using molecular docking studies. The ligands used for docking has moderate binding affinity to active sites of main protease in terms of values. The binding affinities of these ligands are in the range of -3.1 to -5.1 kcal mol<sup>-1</sup>. All the ligands bind selectively to Cys-145 and also to other amino acids surrounding to it in the main protease. Of which arginine forms less number of weaker bonds compared to the other ligands, it by itself is a precursor for the formation of citrulline analogues with in the cell. Major advantage of using the above ligands is that in addition to its preferential binding these molecules also have the ability to enhance the immunity of the cells by the generation of nitric oxide in presence of enzymes thereby protecting them. Our results show that N-acetyl citrulline, citrulline, thiocitrulline and arginine may be used as a supplement during the treatment of SARS-COV-2.</p> <p> I request your good self to kindly accept the article and get it published as pre-print in your esteemed ChemRxiv. </p> <p>Thanking you</p> <p> </p> <p>With regards</p> <p> </p> <p>Ramesh T N</p> <p>(adityaramesh77@yahoo.com)</p>
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