Iswar Chandra Vidyasagar College, (formerly known as Belonia College), established in 1964, is one of the oldest college in South Tripura. It offers undergraduate courses in arts and sciences. It is affiliated to Tripura University.
We investigate solute dispersion in a two-phase system comprising a Casson fluid flowing in a tube and its surrounding wall phase that allows interphase solute exchange to mimic solute transport in blood and tissue phases. A pulsatile pressure gradient is imposed, and Gill's classical methodology is extended to two-phase flows to analyse solute transport. The key parameters are the diffusivity ratio between wall and fluid phases ( $\lambda$ ), the partition coefficient ( $\beta _p$ ), the Womersley number ( $\alpha$ ), the yield stress ( $\tau _y$ ), the wall thickness ( $\delta _h$ ) and the initial dimensionless radius of the solute source ( $a$ ). In the long-time limit, increasing $\lambda$ , $\beta _p$ and $\delta _h$ reduces the phase-averaged convection ( $K_1$ ) and dispersion ( $K_2$ ) coefficients, owing to solute accumulation in the wall where convective and shear-induced transport are absent. Short-time behaviour is dictated by the rate of solute transfer to the wall. Larger $\alpha$ enhances both $K_1$ and $K_2$ , while larger $\tau _y$ suppresses them. The presence of a wall phase permits $K_2$ to reach $O(10<^>{0})$ , compared with $K_2 \sim O(10<^>{-3})$ without a wall, and can delay the onset of steady state to dimensionless time $t \sim O(10<^>{2})$ . Strong solute exchange and increasing wall thickness diminish downstream solute penetration, while non-Newtonian effects promote interphase transfer. These results provide mechanistic insight into solute exchange across fluid-wall interfaces, relevant to solute transport in blood flow and engineered permeable systems.
Green synthesis of silver nanoparticles (AgNPs) using Homalomena aromatica leaf extract as a reducing agent has garnered interest due to its eco-friendly nature and broad applications, particularly in molecular medicine. This study synthesized and characterized AgNPs, denoted as HAL-AgNPs, evidenced by a color change and a UV-VIS absorption peak at 430 nm. FESEM revealed spherical HAL-AgNPs with sizes between 22 and 60 nm, while TEM showed various shapes, averaging 19.43 nm. XRD confirmed a face-centered cubic crystalline structure with a crystallite size of 26.92 nm. FTIR analysis identified functional groups responsible for nanoparticle stabilization. DLS indicated a hydrodynamic diameter of 92.06 nm and a Zeta potential of -27.50 mV. HAL-AgNPs demonstrated significant antibacterial activity against Gram-positive (B. subtilis, S. aureus) and Gram-negative bacteria (E. coli, P. aeruginosa), with MICs ranging from 4.375 to 17.5 & micro;g/mL. Additionally, HAL-AgNPs exhibited strong in vitro antioxidant activities, including DPPH, hydrogen peroxide scavenging, reducing power, and metal chelating activities. This cost-effective synthesis method produces stable, bioactive HAL-AgNPs, offering potential applications in molecular medicine as antibacterial agents against multidrug-resistant bacteria and as alternatives to synthetic antioxidants.
Land-use change is a key driver of soil functional dynamics in tropical ecosystems, yet depth-resolved evidence across contrasting land-use systems remains limited in Northeast India. This study quantified variations in soil physicochemical properties, organic carbon, microbial biomass carbon (MBC), and soil respiration across four dominant land-use systems: managed monoculture Sal Plantations (SP), relatively undisturbed natural Mixed Forests (MF), semi-managed pineapple-based agroforestry systems (PBAS) and seasonal rain-fed agricultural systems (RFA) along 4 different soil profiles in Tripura. Soil samples from multiple depths were analyzed using linear mixed-effects models to account for land use, depth, and site-level variability. Land use significantly influenced most measured soil properties (p < 0.05). Rain-fed agricultural systems exhibited 25–40
Abstract Insects are increasingly promoted as sustainable alternatives to conventional animal protein owing to their rich nutrient composition. In addition to food value, insect-derived peptides exhibit antioxidant, antimicrobial, and antihypertensive properties, creating new opportunities in biomedicine and biotechnology. However, in India, insect consumption remains localized, mostly within tribal and rural communities. Northeast India, a major biodiversity hotspot of eight states, preserves strong traditional entomophagy practices. The present study assesses the nutritional profile, allergenic risks of two edible orthopteran insects popular in Assam, short-horned grasshopper ( Chondracris rosea ) and mole cricket ( Gryllotalpa orientalis ). Results show that both the species are rich in amino acids and vitamins; grasshoppers provide abundant iron, zinc and magnesium, and mole crickets supply notable calcium and vitamin K, reinforcing their significance as sustainable nutrient sources. The presence of amino acid residues known to support the structural stability of allergenic proteins, proline, cysteine, phenylalanine and methionine, was verified by biochemical investigation. SDS-PAGE confirms the presence of arginine kinase and tropomyosin in both samples, but higher in G. orientalis which aid in allergic reaction.
Controlling solute transport in microcapillaries is central to the intersection of microfluidic and biomedical technologies yet predicting dispersion in viscoelastic flows with reactive surfaces remains elusive. Here, we present a first-of-its-kind analytical framework that captures the coupled effects of non-Newtonian fluid elasticity, shear-thinning and surface adsorption-desorption kinetics on solute dispersion within cylindrical microcapillaries. Leveraging the Phan-Thien-Tanner (PTT) model for viscoelastic flow and employing the method of moments alongside multiple-scale analysis, we derive closed-form expressions for axial dispersion and advection coefficients, bypassing the need for computationally expensive simulations. Our model accounts for reversible solute interactions at reactive walls, revealing how key parameters such as Deborah number, reaction kinetics and molecular diffusivity orchestrate the resulting transport phenomena. The analysis not only unravels the subtle interplay between fluid rheology and surface chemistry towards dictating the resulting dispersion characteristics, but also provides key insights for the rational design and optimization of next-generation microfluidic and biomedical systems, enabling precise control over solute transport in micro-confined geometries.
