Dinhata College (Bengali: দিনহাটা মহাবিদ্যালয়) established in 1956, is one of the oldest college in Dinhata. It offers undergraduate courses in arts, commerce and sciences. The campus is in the Cooch Behar district. It is affiliated to Cooch Behar Panchanan Barma University. Formerly affiliated to University of North Bengal..
The green procedure has emerged as a promising technique for the synthesis of inorganic nanoparticles because of its eco-friendliness, simplicity, cost-effectiveness, and low toxicity. Taking into account all these unique characteristics, we have introduced the use of aqueous extract of Ananas Comosus and Murraya koenigii at ambient temperature for the preparation of iron oxide nanoparticles. The active organic alkaloid compounds present in the above-mentioned leaves act as reducing as well as capping agents during the synthesis procedure. The synthesized biogenic rhombohedral alpha-Fe2O3 (Hematite) NPs exhibit remarkable catalytic activity toward the degradation of noxious organic dyes, viz., methylene blue (MB) and methyl orange (MO), and they retain their catalytic activity up to five cycles. MB is degraded within 18 min, while MO becomes colorless within 28 min. The synthesized nanoparticles also exhibit antibacterial activity, which has been checked against E. coli and S. aureus bacterial strains. In a nutshell, this work emphasizes the sustainable approach of using A. Comosus and M. koenigii leaf extracts to synthesize catalytically active iron oxide nanoparticles. Such plant extracts can be used for the preparation of metal and metal oxide nanoparticles for their applications in different important fields, including biological applications.
Development of efficient and sustainable catalytic method has been of keen interest in the area of green synthesis. Herein, we report for the first time, Pr3+ mediated rearrangement of phenolphthalein hydrazide to its corresponding dihydrophthalazine and its application toward sensing of nitrophenols have also been explored. The sensing performance of the dihydrophthalazine ligand was evaluated toward o-nitrophenol, p-nitrophenol, and 2,4,6-trinitrophenol that is, picric acid. The ligand exhibited marked selectivity for picric acid as evidenced by the appearance of a new charge-transfer absorption band through pi-pi stacking interaction at similar to 360 nm in the UV-vis spectrum. The binding stoichiometry between dihydrophthalazine and picric acid was elucidated using the Job plot method based on UV-vis spectroscopic measurement. Additionally, the synthesized dihydrophthalazine demonstrated sensitivity toward strong bases, displaying a visible color change from light pink to light purple. Furthermore, as an electron-rich donor, dihydrophthalazine forms a charge transfer complex with the electron deficient acceptor picric acid, which is corroborated by both experimental (UV-vis spectroscopy) and theoretical (DFT) calculations.
Groundwater degradation poses a critical threat to water security in the Indian subcontinent, driven by intensifying anthropogenic pressures and geogenic processes. This study conducts a comprehensive comparative assessment of spatial groundwater quality dynamics between the agriculturally intensive Ganga River Basin (GRB) and the ecologically distinct Brahmaputra River Basin (BRB). Utilizing 2325 samples from the Central Groundwater Board (2018), the analysis integrated the Water Quality Index (WQI), Inverse Distance Weighting (IDW), and Welch’s t-test across 12 key parameters (pH, EC, TH, Calcium, Mg, Cl, Bicarbonate, Sulphate, NO3, Fluoride, and Na). Results reveal profound, statistically significant disparities: the GRB faces widespread degradation, with 14.62
Fossil resin preserves molecular information that provides valuable insights into the composition of palaeovegetation and its palaeoclimatic significance. Variation in the chemistry of fossil resin derived from different plants serves as an important tool for understanding plant chemotaxonomy. However, most previous studies have limited the chemotaxonomic interpretation of fossil resins to the family level. In this study, we present a detailed molecular signature of Eocene amber from North-East India to determine its botanical source at the genus level to understand the nature of Eocene forests in the area. Gas chromatography-mass spectrometry (GC-MS) analyses reveal the presence of C15 sesquiterpenoids along with C30 pentacyclic triterpenoids in the total ion chromatograms (TICs), indicating an angiosperm origin of the fossil resin. The presence of dammarane compounds in the fossilised resin suggests they originate from the Dipterocarpaceae family. Modern resin from two different genera of Dipterocarpaceae, Shorea and Dipterocarpus, are also studied in parallel to reconstruct the botanical source of the fossil resin. The resin from Shorea is mainly composed of β-amyrin and amyrone compounds, while the resin from Dipterocarpus mainly contains dipterocarpol and other dammarane triterpenoids. The fossil resin is rich in ocotillone, dipterocarpol, 20, 24-epoxy-25-hydroxy-dammaran-3-one, and oxidised dammarane derivatives, and lacks amyrin-type triterpenoids, aligning with the molecular signature of modern Dipterocarpus. Therefore, these findings suggest that the amber was produced by Dipterocarpus trees and provide direct biomolecular evidence for the presence of dipterocarp-dominated, humid tropical rainforest elements in North-East India during the Eocene.
