Jogamaya Devi College is one of the oldest and leading women's colleges in Kolkata, India. It shares the same building with Asutosh College (day college) and Syamaprasad College (evening college) and is named after the wife of Sir Asutosh Mukherjee. It is a National Assessment and Accreditation Council (NAAC) accredited Grade "B" college. It offers undergraduate and postgraduate degrees and is affiliated to the University of Calcutta. It was established in 1932.
2D MoS2, a wonder material, has emerged as a highly efficient catalyst owing to its unique morphology, band structure, and reduced size. Here, hierarchical MoS2 nanoflowers with exposed petals and abundant edges are hydrothermally synthesized and evaluated for sonocatalytic dye removal. The polymorphic few-layer MoS2 nanosheets comprising metallic 1T (45%) and semiconducting 2H (55%) phases exhibit dual functionality in adsorption and piezocatalysis toward ultrafast dye removal when subjected to mechanical strain. Under ultrasonic irradiation, the 1T/2H MoS2 sonocatalyst removes 99.6% of RhB dye within 9 min, which is five times faster than the adsorption process. Other dyes, such as MB and RB, are also very rapidly removed within a few seconds by the MoS2 sonocatalyst. On application of ultrasound vibration, a built-in piezoelectric field is developed across the few-layer 1T/2H MoS2 nanosheet which drives the separation and migration of charge carriers promoting redox reactions for dye degradation. The low dimensionality, high fraction edge sites, wider bandgap (1.55 eV), and abundant sulfur vacancies of 1T/2H MoS2 collectively enhance the piezocatalyst property of the material. The photo-sonocatalytic study of the material exhibits a slower removal reaction process when the material is subjected to simultaneous ultrasound and visible light irradiation. This photo-assisted retardation phenomenon can be attributed to the depletion of piezoelectric polarization by the photo-generated carriers. Hence, this work explores the remarkable catalytic properties of the few-layer 1T/2H MoS2 nanosheet for efficient mechanical-energy-driven pollutant removal under ultrasound and visible light irradiation.
Type 2 diabetes mellitus (T2DM) is a multidimensional metabolic disorder characterized by hyperglycemia, insulin insensitivity, and dysfunction and degeneration of β-cells. Increase in the levels of free fatty acids (FFAs) in blood plasma is a typical symptom of obesity and metabolic syndrome, which influences the mechanisms of insulin resistance and β-cell impairment. Acute increase in FFA levels blocks glucose uptake by insulin-sensitive skeletal muscles while chronic increase in FFA levels results in hepatic insulin resistance which causes gluconeogenic flux and lipotoxicity in pancreatic βcells. FFA-induced insulin resistance involves various molecular pathways and generation of lipid intermediates (diacylglycerol and ceramides), activation of serine/threonine kinases (PKC), induction of oxidative and endoplasmic reticulum stresses, and inflammatory signaling via nuclear factor-κB (NF-κB) and toll-like receptor (TLR) signaling pathways. Recent studies have indicated that the fetuin-A-FFA complex is an important endogenous ligand of TLR4 that causes inflammation and metabolic dysregulation. In addition, certain FFAs, especially ω-6 polyunsaturated fatty acids, can elicit ferroptosis which is a new form of lipid peroxidation-mediated cell death in β-cells, thereby expanding the extent of FFA-mediated lipotoxicity. This review covers recent information on the mechanisms and clinical factors related to the role of FFAs in insulin resistance and T2DM pathogenesis, and the contribution of experimental research towards developing therapeutic strategies in normalizing the levels of FFA and inhibiting downstream lipotoxicity-related pathways.
The radii of the exotic hadrons like tetraquarks and pentaquarks are studied considering diquark-anti diquark configuration of tetraquarks and diquark-diquark-antiquark picture of pentaquarks. Diquarks are described as composite fermions. Binding energies are calculated using the ground state masses of the tetraquarks and pentaquarks, as estimated within the framework of the Flux Tube model. The leptonic decay widths for tetra quarks are studied using van-Royen Weisskoff formula. The decay widths are found to be small, ranging from 10^-3 to 10^-7 MeV, as expected from experimental results. The form factors of pentaquarks have been studied with the computed radii for different ranges of momentum transfer. The study is important for understanding the properties of newly discovered exotic particles.
Precise calculations have been performed to determine the bound-state energies and resonance parameters (positions and widths) of the 1Se states of the helium atom embedded in Debye plasma, with the mass-polarization (MP) term explicitly incorporated into the Hamiltonian. Accurate bound-state energies of the 1Se states are obtained within the framework of the Ritz variational method using an explicitly correlated multi-exponent Hylleraas basis set. Employing the sophisticated stabilization method we evaluate the resonance parameters of the resonance 1Se states below second ionization threshold. The computed outcomes for both bound and resonance states (RS) show reasonable agreement with the available results from the literature under the infinite nuclear mass approximation. But those with finite nuclear mass are reported for the first time. Detailed analysis indicates that the inclusion of MP produces a positive shift in the energy levels across all bound and RSs. Moreover, plasma effects are found to reduce the number of bound and RSs, irrespective of the MP contribution, while the inclusion of the MP term increases the lifetime of the RSs.
We have investigated the spectroscopy of the different exotic tetraquarks such as K, f_0 , D, Y, Z_s , Z_c , T_cc , T_cc , X_c etc. embedded in a strongly interacting medium with the variation of density and temperature of the medium. The momentum and density dependent potential and power law type of temperature scaling play crucial roles in this regard. The tetraquarks have been treated as composite system of diquark-antidiquark in the context of Composite Fermion (CF) quasiparticle model and their effective masses have been estimated. Moreover, when these tetraquarks are embedded in a strongly interacting medium, the density and the temperature of the medium affect their masses. These variations of masses have been explored in detail and have been displayed in the graphs. They have also been compared with works of others.
