A facile regio- and stereoselective synthesis of novel dispirooxindolyl-[acridine-2′,3-pyrrolidine/thiapyrrolizidine]-1′-ones via 1,3-dipolar cycloaddition of azomethine ylides

A facile regio- and stereoselective synthesis of novel dispirooxindolyl-[acridine-2′,3-pyrrolidine]-1′-ones and dispirooxindolyl-[acridine-2′,3-thiapyrrolizidine]-1′-ones have been accomplished via 1,3-dipolar cycloaddition of azomethine ylides, generated in situ from the reaction of sarcosine/1,3-thiazolane-4-carboxylic acid and substituted isatins, to a series of (E)-2-[arylmethylidene]-3,4-dihydro-1(2H)-acridinones in good yields.     

One-Pot Sequential Synthesis of β-Hydroxy-1,4-disubstituted-1,2,3-triazoles from in-situ Generated β-Azido Alcohol by Click Chemistry

β-Hydroxy 1,2,3-triazoles from in situ generated 1,2-azidols were synthesized employing two sequential click reactions in very high yields with high regioselectivity using Cu(OAc)₂·H₂O as a catalyst in water at ambient temperature     

Mechanical Properties and Chemical Resistance of Short Tamarind Fiber/Unsaturated Polyester Composites: Influence of Fiber Modification and Fiber Content

In the present work, tamarind fibers were extracted from ripened fruits by the water retting process. Using these fibers as reinforcement and unsaturated polyester as matrix, composite samples were prepared by the hand lay-up technique. The effect of chemical surface treatments (alkali and silane) of tamarind fibers on the mechanical properties, chemical resistance, and interfacial bonding was studied. The mechanical properties of the composites with surface modified fibers were found to be higher than those with unmodified fibers. Morphological studies indicated improvement of interfacial bonding by alkali and silane coupling agent treatments of the fibers. The composites were found to be resistant to many chemicals.     

Analytical solution of non-linear enzyme reaction equations arising in mathematical chemistry

The boundary value problem in basic enzyme reactions is formulated and approximate expressions for substrate and substrate-enzyme complex are presented. He’s Homotopy Perturbation method is used to give approximate and analytical solutions of non-linear reaction equations containing a non-linear term related to enzymatic reaction. The pertinent analytical solutions for the substrate, enzyme- substrate complex and free enzyme are discussed in terms of dimensionless parameters σ, ρ and e{\varepsilon} . The obtained concentration results are compared with the numerical solution acquired using Matlab program. They are found to be in satisfactory agreement.     

Effect of combination processing on the microbial, chemical and sensory quality of ready-to-eat (RTE) vegetable pulav

Effect of irradiation in combination with retort processing on the shelf life and safety aspects of an ethnic Indian food product like vegetable pulav was investigated. Gamma irradiation of RTE vegetable pulav was carried out at different dosage rates with ⁶⁰Co followed by retort processing. The combination processed samples were analysed for microbiological, chemical and sensory characteristics. Microbiological analysis indicated that irradiation in combination with retort processing has significantly reduced the microbial loads whereas the chemical and sensory analysis proved that this combination processing is effective in retaining the properties even after storage for one year at ambient conditions. The results also indicated that a minimum irradiation dosage at 4.0 kGy along with retort processing at an F₀ value of 2.0 is needed to achieve the desired shelf life with improved organoleptic qualities.     

Purely imaginary roots of kac-moody algebras

In this paper, we introduce a new class of imaginary roots, called purely imaginary roots and give a necessary and sufficient condition for an imaginary root to be purely imaginary,thereby giving a complete classification of those Kac-Moody algebras with the purely imaginary property, namely, all their imaginary roots are purely imaginary. We also define a new class of non-hyperbolic indefinite Kac-Moody algebras, called the extended hyperbolic kac-Moody algebras possessing the purely imaginary property.     

Studies on the uptake behavior of nickel from flowing sodium for Mn,Co and Zn

Journal of Radioanalytical and Nuclear Chemistry - In this study, the natural luffa fiber was easily modified by chemical method with amide groups and phosphoric acid (LF-A2-M1/P). SEM, XRD, FTIR...     

Exploring hesperidin-copper complex as an enzyme mimic for monitoring macrophage activity

Journal of Solid State Electrochemistry - The present study evaluates the potential of hesperidin-copper complex for sensing superoxide anions, which is an important marker for the diagnosis of...