Particle's acceleration in static homogeneous gravitational field is cancelled by any reference frame of the same accelerating direction and the same accelerating rate. The frame is commonly called the freely-falling one. The present paper shows that the acceleration is also cancelled by a spatial curvilinear coordinate system. The coordinate system is simply a spatial square-root coordinate re...

Abstract In this work, we used the design strategy “doped nonpolar polymers” and synthesized polyurethane elastomers (PUEs) by doping with highly polar aromatic molecules such as benzoic acid (BA), 4(para)-nitro-benzoic (PNBA), 3, 5-di-nitro-benzoic (3, 5-DNBA) using solution casting method. The effect of each molecule in three different weight percentages 2%, 4%, 6% on electrical thermo-mechan...

Barbero recently suggested a modification of Ashtekar’s choice of canonical variables for general relativity. Although leading to a more complicated Hamiltonian constraint this modified version, in which the configuration variable still is a connection, has the advantage of being real. In this article we derive Barbero’s Hamiltonian formulation from an action, which can be considered as a gener...

Nitro compounds are an important class of organic molecules with broad application in synthesis, medicinal chemistry, and materials science. Among the variety methodologies available for their direct oxidation primary amines represents attractive alternative route. Efforts towards development oxidative procedures synthesis nitro derivatives have spanned over past decades, leading to a wide prot...

Metal catalysts based on ligands containing proton-responsive sites have found widespread applications in the hydrogenation of polar unsaturated substrates. In this contribution, Ir complexes incorporating lutidine-derived CNP (C = N-heterocyclic carbene, NHC; P phosphine) pincer with two nonequivalent Brønsted acid/base been examined aldehydes. To end, Ir(CNP)H2Cl were synthesized steps from l...

Background & Aims of the Study: One of the most carcinogenic and toxic pollutants is p-Nitro Cresol. In this study, the degradation and mineralization of p-Nitro Cresol in aqueous solution were investigated by Fenton process in a batch reactor. Materials & Methods: This study is an experimental research on a laboratory scale. The study executed on synthetic wastewater hav...

Natural killer T (NKT) cells comprise a family of specialized T cells that recognize lipid antigens presented by CD1d. Based on their T cell receptor (TCR) usage and antigen specificities, CD1d-restricted NKT cells have been divided into two main subsets: type I NKT cells that use a canonical invariant TCR α-chain and recognize α-galactosylceramide (α-GalCer), and type II NKT cells that use a m...

tRNA splicing endonucleases, essential enzymes found in Archaea and Eukaryotes, are involved in the processing of pre-tRNA molecules. In Archaea, three types of splicing endonuclease [homotetrameric: α(4), homodimeric: α(2), and heterotetrameric: (αβ)(2)] have been identified, each representing different substrate specificity during the tRNA intron cleavage. Here, we discovered a fourth type of...