North Eastern Hill University

About: North Eastern Hill University is a education organization based out in Shillong, Meghalaya, India. It is known for research contribution in the topics: Population & Ruthenium. The organization has 2318 authors who have published 4476 publications receiving 48894 citations.

Experimental and computational study on photophysical properties of substituted o-hydroxy acetophenone derivatives : Intramolecular proton transfer and solvent effect

Abstract: The intramolecular proton transfer reaction, relative stability of different conformers arising from the internal torsional motion and effect of solvent on the photophysical properties in the ground (S0) as well as first excited singlet (S1) state is studied for two prototype intramolecularly hydrogen bonded o-hydroxy acetophenone analogues, namely 2-acetyl-4-methyl-6-nitrophenol (I) and 2-acetyl-4-chloro-6-nitrophenol (II) by steady state and time-resolved fluorescence spectroscopy and density functional theory. In addition to the enol (E) structure suitable for excited state intramolecular proton transfer (pro-ESIPT), two non-ESIPT enol conformers (E1 and E2) are also predicted in the ground state. Exothermic ESIPT from E results largely Stokes shifted tautomeric emission for both the compounds. On the other hand, the excited state photophysics of E1 or E2 is largely controlled by the nature of the solvent. TDDFT calculation with B3LYP/6-31++G(d,p) method reproduces the experimental results in these systems much better than hybrid functionals like BHandHLYP, MPWPW91 and MPWB1K.

A new species of Abelmoschus Medik. (Malvaceae) from Chhattisgarh, India

Abstract: A new species of Malvaceae, Abelmoschus palianus Sutar, K. V. Bhat et S. R. Yadav is described and illustrated from Chhattisgarh, India. The morphological differences between the new species and related taxa are discussed.

A Study on Parameters Optimization for Degradation of Endosulfan by Bacterial Consortia Isolated from Contaminated Soil

Abstract: Endosulfan, a non-systemic organochlorine pesticide used extensively to control the insect pests of a wide range of crops is of environmental concern because of its apparent persistence and toxicity to many non-target organisms. The present study was aimed to find out the capability of microorganisms to degrade endosulfan, singly and/or in consortium and optimization of various growth parameters to achieve optimal degradation. A total of three isolates showing significantly higher degradation potential were selected from eight isolates demonstrating substantial growth. They were identified as Staphylococcus equorum CM5, Enterobacter sp. MF1 and Bacillus subtilis MF2. The effect of various parameters (pH, temperature, inoculum size, endosulfan concentration, incubation conditions and carbon concentration) were also assessed and optimized for degradation of endosulfan. The consortia of Staphylococcus and Bacillus strain showed near disappearance of endosulfan from the medium after 21 days of incubation. The maximum degradation percentage of endosulfan was observed at slightly alkaline pH 8.0 under shaking conditions of 150 rpm at 30 °C at a concentration of 1 g l−1 of dextrose and irrespective of the inocula size used in this study. The isolates identified in this study present an efficient, economical and ecological alternative remedy for the removal of endosulfan from contaminated sites.