Publications by authors named "Saha S"

We introduce a highly efficient method for the catalytic breakdown of organic compounds using nanorods embedded within hollow nanospheres structured magnetoelectric nanocatalyst (MENC). MENCs were fabricated through a single-step process utilizing the ultrasonic spray pyrolysis technique. The dynamic electric dipole generation capability due to synergistic interaction between nanorods at the core and the hollow nanosphere shell creates a nanoscale magnetoelectric device capable of electrocatalysis-assisted water purification through advanced oxidation processes under remotely applied magnetic field excitation.

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In breast cancer treatment, accurately predicting how long a patient will survive is crucial for decision-making. This information guides treatment choices and supports patients' psychological recovery. To address this challenge, we introduce a novel predictive model to forecast breast cancer prognosis by leveraging diverse data sources, including clinical records, copy number variation, gene expressions, DNA methylation, microRNA sequencing, and whole slide image data from the TCGA Database.

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Employing the spin-orbit coupling effect by introducing halogen substituents is an excellent strategy to tune the magnetic behavior of organic or metal-organic materials. Light is an alternative tool to modulate the magnetic behavior of a material through a photoinduced electron transfer process, without changing its chemical identity. In this work, three halogen containing 1,4-bis(4,5-diphenyl-1-imidazol-2-yl)benzene (F-BDPI, Cl-BDPI and Br-BDPI) systems have been chosen to exploit the role of halogen substituents on solid-state photoinduced phenomena.

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Background: Glioblastoma (GBM) is the most common primary malignant brain tumor. The aim of this study was to elucidate the role of microenvironment and intrinsic T-type calcium channels (Cav3) in regulating tumor growth and progression.

Methods: We grafted syngeneic GBM cells into Cav3.

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This case report presents a posterior circulation infarction in a previously healthy 39-year-old male, three months post-severe COVID-19. He presented with right-sided homonymous hemianopia and elevated inflammatory markers and D-dimer levels. Imaging revealed an acute left occipital infarct.

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Typical layered 2D APbX (A: organic ammonium cation, X: Br, I) perovskites undergo irreversible decomposition at high temperatures. Can they be designed to melt at lower temperatures without decomposition? Which thermodynamic parameter drive the melting of layered perovskites? These questions are addressed by considering the melt of APbX as a mixture of ions (like ionic liquids), and hypothesized that the increase in the structural entropy of fusion (ΔS) will be the driving force to decrease their melting temperature. Then to increase structural ΔS, A-site cations are designed that are rigid in the solid crystal, and become flexible in the molten state.

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Cr-doped ZnO (CZ) nanoparticles are prepared using hydrothermal and co-precipitation techniques. The desired crystallographic phase of the nanoparticles is confirmed using X-ray diffraction study. Rod-shaped and spherical morphologies of CZ nanoparticles prepared using hydrothermal and co-precipitation techniques were confirmed through FESEM observation.

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The majority of the eukaryotic cell surface is decorated with a layer of membrane-attached polysaccharides and glycoproteins collectively referred to as the glycocalyx. While the formation of a bulky glycocalyx has been associated with the cancer progression, the mechanisms by which the glycocalyx regulates cancer invasiveness are incompletely understood. We address this question by first documenting subtype-specific expression of the major glycocalyx glycoprotein Mucin-1 (MUC1) in breast cancer patient samples and breast cancer cell lines.

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Disrupting mitochondrial function in malignant cells is a promising strategy to enhance anticancer immunity. We have recently demonstrated that depriving colorectal cancer cells of serine results in mitochondrial dysfunction coupled with the cytosolic accumulation of mitochondrial DNA and consequent activation of CGAS- and STING-dependent tumor-targeting immune responses.

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The demographic shift towards an aging population necessitates a reevaluation of surgical interventions like coronary artery bypass grafting (CABG) in octogenarians. This study aims to elucidate the outcomes of CABG in octogenarians with heart failure and reduced ejection fraction (HFrEF), a group traditionally considered at high risk for such procedures. Conducted across four academic hospitals in Germany from 2017 to 2023, this retrospective multicenter study assessed 100 patients (50 octogenarians ≥80 years and 50 non-octogenarians <80 years) with HFrEF undergoing isolated CABG.

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Introduction: Generating new lymphatic vessels has been postulated as an innovative therapeutic strategy for various disease phenotypes, including neurodegenerative diseases, metabolic syndrome, cardiovascular disease, and lymphedema. Yet, compared to the blood vascular system, protocols to differentiate human induced pluripotent stem cells (hiPSCs) into lymphatic endothelial cells (LECs) are still lacking.

Methods: Transcription factors, ETS2 and ETV2 are key regulators of embryonic vascular development, including lymphatic specification.

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With increasing demand for improved protein-rich food, diverse poultry birds like turkey are gaining popularity in India. However, with the rising concerns of antibiotic residues and drug resistance, safe alternatives like formic acid (FA) and thymol (TH) have attracted the attention of researchers as effective replacer of antibiotic growth promoters (AGP). This experiment investigated the effects of combinations of FA and TH on growth performance, immunity, gut microflora and jejunal microstructures in turkey.

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Obstruction of the superior vena cava (SVC) is a rare complication after cardiac surgery in infants and children. We present the case of an 8-year-old boy who underwent bi-directional Glenn shunt followed by takedown of Glenn shunt and complete repair for cyanotic congenital heart disease. After 4 years of surgery, the child developed features of superior vena caval (SVC) syndrome.

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Article Synopsis
  • The study investigates the prevalence of rectovaginal group B Streptococcus (GBS) colonization in pregnant women during labor and its transmission to newborns in selected low-income and middle-income African and South Asian countries.
  • Conducted across 11 maternity and obstetric facilities, the research involved collecting samples from 6,514 HIV-negative pregnant women at least 37 weeks gestation to analyze GBS culture and serotyping.
  • The findings revealed a 24.1% rate of maternal GBS colonization, with the highest prevalence in Mali (41.1%) and the lowest in Ethiopia (11.6%), highlighting significant regional variations in GBS rates among pregnant women.
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Fall armyworm (FAW), (J.E. Smith), a threat to maize production systems, is a polyphagous pest of global significance.

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Synthesis of diversely functionalized quinoline-2-carboxylates is illustrated through electrochemical cross-dehydrogenative coupling between -aryl glycinates and methylenecyclopropanes. An extensive range of distinct functionalities is well-compatible under these transition-metal- and oxidant-free mild electrochemical conditions, contributing to a broad substrate scope and practical applicability. Cyclic voltammetric measurements and control experiments suggested a formal [4 + 2] cycloaddition involving radical intermediates, followed by a cyclopropyl ring opening through nucleophilic polar addition, consecutively fabricating C-C and C-N bonds.

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Akin to the traditional quasi-classical trajectory method for investigating the dynamics on a single adiabatic potential energy surface for an elementary chemical reaction, we carry out the dynamics on a 2-state ab initio potential energy surface including nonadiabatic coupling terms as friction terms for D + H collisions. It is shown that the resulting dynamics correctly accounts for nonreactive charge transfer, reactive non-charge transfer and reactive charge transfer processes. In addition, it leads to the formation of triatomic DH species as well.

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Article Synopsis
  • A study was conducted on the reaction of dimethyl acetylene dicarboxylate (DMAD) with hypersilyl tetrylenes at room temperature, focusing on the compounds PhC(NBu)ESi(SiMe) where E = Ge (germanium) and Sn (tin).
  • The germylene (with germanium) resulted in the formation of alkenes, while the stannylene (with tin) also produced alkenes but exhibited different behavior.
  • Computational studies using DFT (Density Functional Theory) provided insights into the differing stereoselectivity observed in the reactions.
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Detection of specific ions using fluorescent probes has relevance in several areas of therapeutics development and environmental science. Here, we provide new perspectives to the sensing of a styryl benzothiazolium-based fluorescent compound 1 and report that sensing properties are for sulfite ions in general with highest preference for metabisulfite ions (SO) adding to its previously determined role as a bisulfite ion sensor. This probe exhibits its sensing action via an addition reaction in which the styryl double bond gets reduced.

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The severity of autism spectrum disorder (ASD) shows wide variations, though the reason remains unclear. Vitamin D (VitD) deficiency is considered a risk factor for ASD and its supplementation was reported to reduce symptom severity. Since VitD, either synthesized in the skin or absorbed from the food, is transported to the liver by the vitamin D binding protein (DBP), we have analyzed DBP genetic polymorphisms [rs7041 (A/C), rs4588 (G/T), and rs3755967 (C/T)] affecting DBP function [Case = 411; Control = 397], levels of plasma 25(OH)D and DBP [Case = 25; Control = 26], and DBP mRNA expression [Case = 74; Control = 44] in a group of Indo-Caucasoid ASD probands and neurotypical subjects.

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Chemically active colloids or enzymes cluster into dense droplets driven by their phoretic response to collectively generated chemical gradients. Employing Brownian dynamics simulation techniques, our study of the dynamics of such a chemically active droplet uncovers a rich variety of structures and dynamical properties, including the full range of fluidlike to solidlike behavior, and non-Gaussian positional fluctuations. Our work sheds light on the complex dynamics of the active constituents of metabolic clusters, which are the main drivers of nonequilibrium activity in living systems.

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Article Synopsis
  • - The molecule methyl(10-phenylphenanthren-9-yl)sulfane (MPPS) has been synthesized and studied as a new fluorescent probe, revealing important photophysical properties through a combination of experimental methods and theoretical calculations.
  • - The study highlights how the molecule’s structure, particularly the rotation of its phenyl and phenanthrene rings, affects its fluorescence emissions and lifetimes, with variations observed in different solvent polarities.
  • - MPPS has been successfully utilized to determine critical micelle concentrations (cmc) of various surfactants and further characterized the binding interaction between a gemini surfactant and bovine serum albumin (BSA), confirming its effectiveness in studying microheterogeneous systems.
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