Publications by authors named "Roy Chaudhuri"

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  • Antibiotics like Ciprofloxacin, tetracycline, and Tobramycin are widely used but can lead to antibiotic resistance when their residues enter the environment.
  • Traditional monitoring methods for these antibiotics, such as LC-MS, are costly and complex, while nanoscale field-effect transistors (FETs) offer quick and sensitive alternatives but struggle with consistency in performance.
  • The study presents an innovative approach using thermally reduced graphene oxide FETs on printed circuit boards, achieving ultra-sensitive detection of antibiotics at femtomolar levels with machine learning, enabling effective monitoring of water contamination.
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  • Clostridioides difficile is a bacteria that can cause serious infections, and there aren’t many medicines to treat it, mainly vancomycin.
  • Recently, some bacteria have started to resist vancomycin, but C. difficile hasn’t shown high-level resistance yet.
  • Scientists found that C. difficile can quickly develop resistance, but this makes it less able to spread and survive, which might help doctors keep it under control.
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  • The UK Health Security Agency reported a surge in scarlet fever and invasive diseases caused by Group A Streptococcus (StrepA) at the end of 2022 and early 2023, leading to a study of 341 throat and skin isolates collected in Sheffield.
  • The study found that most common types in throat isolates were types 1, 12, and 22, while skin isolates included types 1, 12, 76, and 49, showing a mix of lineages different from previous years (2016-2017).
  • Analysis indicated that only 51% of throat isolates produce a capsule, compared to 78% of skin isolates, and a significant number of throat isolates exhibited high
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In pursuing advanced neuromorphic applications, this study introduces the successful engineering of a flexible electronic synapse based on WO, structured as W/WO/Pt/Muscovite-Mica. This artificial synapse is designed to emulate crucial learning behaviors fundamental to in-memory computing. We systematically explore synaptic plasticity dynamics by implementing pulse measurements capturing potentiation and depression traits akin to biological synapses under flat and different bending conditions, thereby highlighting its potential suitability for flexible electronic applications.

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  • Researchers have been trying to improve the sensitivity of FET biosensors by tackling the Debye screening effect, with some success in detecting biomolecules at very low concentrations, but facing challenges like high background noise and poor control.
  • Recent studies using deformed/crumpled graphene have shown promise for detecting biomolecules like DNA and COVID-19 proteins, but conventional fabrication methods like chemical vapor deposition lead to contamination and defects.
  • The new method described in this paper creates a textured glass substrate for better graphene deposition, resulting in superior sensitivity for detecting GFAP—an important biomarker for traumatic brain injury—achieving detection limits significantly lower than prior methods.
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Aims: Pancreatic ductal adenocarcinoma (PDAC) is often intrinsically-resistant to standard-of-care chemotherapies such as gemcitabine. Acquired gemcitabine resistance (GemR) can arise from treatment of initially-sensitive tumors, and chemotherapy can increase tumor aggressiveness. We investigated the molecular mechanisms of chemoresistance and chemotherapy-driven tumor aggressiveness, which are understood incompletely.

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Purpose: Paracrine activation of pro-fibrotic hedgehog (HH) signaling in pancreatic ductal adenocarcinoma (PDAC) results in stromal amplification that compromises tumor drug delivery, efficacy, and patient survival. Interdiction of HH-mediated tumor-stroma crosstalk with smoothened (SMO) inhibitors (SHHi) "primes" PDAC patient-derived xenograft (PDX) tumors for increased drug delivery by transiently increasing vascular patency/permeability, and thereby macromolecule delivery. However, patient tumor isolates vary in their responsiveness, and responders show co-induction of epithelial-mesenchymal transition (EMT).

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Background And Purpose: Elevated fibroblast growth factor receptor (FGFR) activity correlates with pancreatic adenocarcinoma (PDAC) progression and poor prognosis. However, its potential as a therapeutic target remains largely unexplored.

Experimental Approach: The mechanisms of action and therapeutic effects of selective pan-FGFR inhibitors (pan-FGFRi) were explored using in vitro and in vivo PDAC models ranging from gemcitabine-sensitive to highly gemcitabine-resistant (GemR).

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Bacterial WxL proteins contain peptidoglycan-binding WxL domains, which have a dual Trp-x-Leu motif and are involved in virulence. It was recently shown that WxL proteins occur in gene clusters, containing typically a small WxL protein (which in the mature protein consists only of a WxL domain), a large WxL protein (which contains a C-terminal WxL domain with N-terminal host-binding domains), and a conserved protein annotated as a Domain of Unknown Function (DUF). Here we analyze this DUF and show that it contains two tandem domains-DUF916 and DUF3324-which both have an IgG-like fold and together form a single functional unit, connected to a C-terminal transmembrane helix.

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Ultrasensitive detection of serotonin is crucial for the early diagnosis of several diseases like Parkinson's and Alzheimer's. Most of the existing detection strategies are still not suitable for sensitive point-of-care applications. This study presents direct molecular imprinting of serotonin on the surface of three-dimensional zinc oxide (ZnO) nanorod devices connected in a field effect transistor (FET) configuration to achieve ultrasensitive, real-time, and rapid detection with a convenient and affordable approach, which has significant potential for translation to clinical settings.

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  • Oral semaglutide is an antidiabetic medication with high costs and gastrointestinal side effects, leading some patients to self-prescribe an alternate-day dosing to manage these issues.
  • A study evaluated the effects of an alternate-day 14 mg dose compared to a daily 7 mg dose on glucose control, weight, and other health metrics in patients with type 2 diabetes.
  • Results showed no significant difference in glucose control between the two dosing schedules, but there was a noteworthy reduction in BMI with the alternate-day dosing.
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Clostridioides difficile is responsible for substantial morbidity and mortality in antibiotically-treated, hospitalised, elderly patients, in which toxin production correlates with diarrhoeal disease. While the function of these toxins has been studied in detail, the contribution of other factors, including the paracrystalline surface layer (S-layer), to disease is less well understood. Here, we highlight the essentiality of the S-layer in vivo by reporting the recovery of S-layer variants, following infection with the S-layer-null strain, FM2.

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Introduction Oral semaglutide, with a long half-life of seven days, is the first oral-based peptide drug and is used as an antidiabetic for the reduction of glycosylated hemoglobin (HbA1c). Oral semaglutide, like other glucagon-like peptide-1 receptor agonists (GLP1RAs), is costly and has gastrointestinal (GI) side effects, especially with a 14 mg dose. In the real world, some type 2 diabetes mellitus (T2DM) patients on 14 mg oral dose adopt an alternate-day strategy to minimize unwanted GI symptoms.

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Background: Diabetes has emerged as an important risk factor for causing severe illness and death from COVID-19. There is a paucity of structured data from the Indian subcontinent on the impact that glycaemic control (both immediate and remote) has on the degree of required medical intervention and mortality among hospitalized COVID-19 patients with type 2 diabetes mellitus (T2DM).

Objectives: To evaluate the differences in clinical characteristics and treatment outcomes between well-controlled and poorly controlled patients with T2DM and COVID-19.

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Two new paths for coordination driven self-assembly reactions under the binding support of 2-((1-hydroxy-2-methylpropan-2-ylimino)methyl)-6-methoxyphenol (HL) have been discovered from the reactions of Cu(ClO)·6HO, NEt and GdCl/DyCl·6HO in MeOH/CHCl (2 : 1) medium. A similar synthetic protocol is useful to provide two different types of self-aggregated molecular clusters [CuGd(L)(HL)(μ-Cl)(μ-OH)(OH)]ClO·4HO (1) and [CuDy(L)(HL)(μ-Cl)(μ-OH)(ClO)(HO)](ClO)·2NHEtCl·21HO (2). The adopted reaction procedure established the importance of the HO and Cl ions in the mineral-like growth of the complexes, derived from solvents and metal ion salts.

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Nanocarriers are candidates for cancer chemotherapy delivery, with growing numbers of clinically-approved nano-liposomal formulations such as Doxil® and Onivyde® (liposomal doxorubicin and irinotecan) providing proof-of-concept. However, their complex biodistribution and the varying susceptibility of individual patient tumours to nanoparticle deposition remains a clinical challenge. Here we describe the preparation, characterisation, and biological evaluation of phospholipidic structures containing solid magnetic cores (SMLs) as an MRI-trackable surrogate that could aid in the clinical development and deployment of nano-liposomal formulations.

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  • Streptococcus pyogenes is a major cause of illness and death, particularly in low-income countries, highlighting the need for a vaccine to combat related diseases like rheumatic heart disease.
  • Researchers in The Gambia conducted genome analyses of S. pyogenes from skin infections, finding these isolates were more genetically diverse compared to isolates from Sheffield, UK, but with differences in certain genetic traits and markers.
  • The study suggests significant genetic diversity between strains from high-income and low-income countries, informing future efforts to develop effective vaccines against S. pyogenes.
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Parasites have evolved proteins, virulence factors (VFs), that facilitate plant colonisation, however VFs mediating parasitic plant-host interactions are poorly understood. Striga hermonthica is an obligate, root-parasitic plant of cereal hosts in sub-Saharan Africa, causing devastating yield losses. Understanding the molecular nature and allelic variation of VFs in S.

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In India, sexuality has long been a silent battleground, which has led to the legal acceptance of non-heteronormative practices in recent years. Given the risk of facing difficulties and social discrimination, questions may arise on the consequences of revealing non-heteronormative gender identity and sexual orientation. Using data from a two-year qualitative immersive study on the queer individuals in India and extant theories on Concealed Stigmatized Identity and Minority Stress, we explore the dynamics of disclosure, or "Coming-out of the closet" and construct a narrative on their lived experiences of stress and coping associated with marginal gender identity.

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To enable detection and discovery of biomarkers, development of label-free, ultrasensitive, and specific sensors is the need of the hour. For addressing this requirement, here, a Schottky-contacted ZnO nanorod biosensor has been demonstrated, which explores the interplay between Schottky junction capacitance and solution resistance, resulting in an interesting sensing principle of competitive impedance spectroscopy. When the transition of dominating impedance occurs from solution resistance to junction capacitance, a notch or a peak appears in the impedance response at a particular frequency (referred to as the corner frequency) depending on the charge of the target molecule.

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Nanocomposite metal oxide thin films exhibit promising qualities in the field of gas sensors due to the opportunities provided by the heterointerface formation. In this work, we present the synthesis of nitrogen doped mesoporous InO-ZnO nanocomposite thin films by a simple wet chemical method using urea as the nitrogen precursor. SEM investigation suggests the formation of mesoporous nanocomposite thin films, where the uniformity of the surface pore distribution depends on the relative proportion of InO and ZnO in the composites.

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Solid-state nanopore has the ability to detect proteins at a single-molecule level with its high sensitivity, high-throughput, and low cost. Improvements in fabrication, functionalization, and characterization of solid-state nanopores keep evolving. Various analytical methods targeted towards diagnostic applications using nanopore-based devices are appearing.

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Sewer systems are complex physical, chemical and microbial ecosystems where fats, oils and grease (FOG) present a major problem for sewer management. Their accumulation can lead to blockages ('Fatbergs'), sewer overflows and disruption of downstream wastewater treatment. Further advancements of biological FOG treatments need to be tailored to degrade the FOG, and operate successfully within the sewer environment.

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Comprehensive identification of conditionally essential genes requires efficient tools for generating high-density transposon libraries that, ideally, can be analysed using next-generation sequencing methods such as Transposon Directed Insertion-site Sequencing (TraDIS). The () transposon is ideal for generating near-saturating mutant libraries, especially in AT-rich chromosomes, as the requirement for integration is a TA dinucleotide, and this transposon has been used for mutagenesis of a wide variety of bacteria. However, plasmids for delivery do not necessarily work well in all bacteria.

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In this paper, a stable hybrid plasmonic optical directional coupler based on an embedded silver nanostructure that can offer a power transfer up to 95% is presented. This optimum power transfer is obtained at an outer edge-to-edge separation of 0.58 µm between the two waveguides.

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Synopsis of recent research by authors named "Roy Chaudhuri"

  • - Recent research by Roy Chaudhuri indicates a strong focus on infectious diseases, especially elucidating mechanisms of resistance in important pathogens like Clostridioides difficile and Streptococcus pyogenes, addressing emerging health threats in the UK and beyond.
  • - Chaudhuri's work also extends into innovative biosensing technologies, notably through developments in flexible electronic synapses and ZnO nanorod structures, aiming for ultrasensitive detection capabilities which have significant clinical applications.
  • - Additionally, Chaudhuri has investigated therapeutic strategies for pancreatic cancer, focusing on inhibiting fibroblast growth factor receptor 1 to counteract chemoresistance, thereby enhancing treatment efficacy in patient-derived xenograft models.