The one-pot three-component reactions of 1-substituted benzimidazoles with ethyl bromoacetate and electron-deficient alkynes, in 1,2-epoxybutane, gave a variety of pyrrolo[1,2-a]quinoxalin-4-ones and pyrrolo[1,2-a]benzimidazoles. The influence of experimental conditions on the course of reaction was investigated. A novel synthetic pathway starting from benzimidazoles unsubstituted at the five m...

Complexes [CrO2 (C8H5O4) (H2O) 3] and [CrO2 (C8H5O4) (H2O) 3] .H2O were prepared by reduction of CrO3 at room temperature by ethanol in the presence of phthalic acid (H2pht) yield solution that contains monomeric and dimeric Cr (III) complexes. A solution H2pht/Cr molar ratio of 1:1 and 1:2 is indefinitely stable towards precipitation. Their analysis were done by using elemental (C and H), ICP-...

Recycled chicken eggshells after calcination have been used as a nonconventional heterogeneous catalyst for biodiesel synthesis from karanja oil from the pongam tree (Pongamia pinnata). The catalyst was characterized on X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and differential thermal analysis/thermogravimetric analysis (DTA/TGA). The formation of the calcium oxi...

 Biodiesel production from non edible oil through transesterification in batch reactor is highly effective technique for kinetic analysis. Temperature, molar ratio, mixing intensity and catalyst influenced the biodiesel production and kinetic. Alkaline catalysts are more efficient in nature as compare to acid and base catalyst. This paper particularly focuses on the impact of NaOH catalyst o...

We report a universal scaling law, tau_{y} = 3R(T_{g}-RT)/V, that uncovers an inherent relationship of the yield strength tau_{y} with the glass transition temperature T_{g} and molar volume V of metallic glasses. This equation is derived from fundamental thermodynamics and validated by various metallic glasses with well-defined yielding. The linearity between tau_{y} and T_{g} demonstrates the...

Pure cultures of aerobic bacteria were isolated which could utilize sulfamate, sulfamide or 1H-2,1,3-benzothiadiazin-4(3H)one 2,2-dioxide (BTDD) as sole source of sulfur for growth and thus cleave a N^S(O)x bond. The molar growth yields indicated that each source of sulfur was utilized quantitatively. This was confirmed directly for Gordonia sp. strain BT2 utilizing BTDD, which was converted qu...

The use of T4 and E. coli DNA ligases in genetic engineering technology is usually associated with nick-closing activity in double stranded DNA or ligation of 'sticky-ends' to produce recombinant DNA molecules. We describe in this communication the ability of T4 DNA ligase to catalyze intramolecular loop formation between annealed oligodeoxyribonucleotides wherein Watson-Crick base pairing is a...

Reactions of silver(I) salts with 4-amino-4H-1,2,4-triazole (4-NH2-tz) in a 1 : 1 molar ratio yield four new silver adducts, namely [Ag(4-NH2-tz)](CF3SO3) (1), [Ag(4-NH2-tz)1.75](ClO4) (2), [Ag(4NH2-tz)1.75](BF4) (3) and [Ag(4-NH2-tz)1.75](NO3) (4). X-Ray analysis shows that 1 exhibits a 3D cationic [Ag(4-NH2-tz)] metal-organic framework of srs topology; 2, 3 and 4 are isostructural and display...

We present a new method for the decomposition of an experimental absorbance matrix into concentration and molar absorption coefficient matrices. The decomposition in general is not unambiguous; therefore, the method may yield only ranges for these matrices. The experimental matrix is not changed, so deviations from the original data can be monitored element by element. Consequently, all chemica...

The objective of this study was to determine the effects of diets having different fermentability on blood gases, blood metabolites and ruminal fermentation parameters in Holstein dairy cows. Four multiparous Holstein dairy cows (665 ± 25 kg BW, 170 ± 7.0 DIM and 15±1.5 kg of milk yield), fitted with rumen cannulae, were used in a 4×4 Latin Square design with 28-d periods. Corn starch and sucro...